Public Enterprises Essay Example for Free

Public Enterprises Essay What are the Objectives of Public Enterprises? SOUMYA SINGH In India, public enterprises have been assigned the task of realising the objectives laid down in the Directive Principles of State Policy. Public sector as a whole seeks: (a) to gain control of the commanding heights of the economy, (b) to promote critical development in terms of social gain or strategic value rather than on consideration of profit, and (c) to provide commercial surplus with which to finance further economic development. The main objectives of public enterprises in India are as follows: 1. Economic development: Public enterprises were set up to accelerate the rate of economic growth in a planned manner. These enterprises have created a sound industrial base for rapid industrialisation of the country. They are expected to provide infrastructure facilities for promoting balanced and diversified economic structure of development. 2. Self-reliance: Another aim of public enterprises is to promote self-reliance in strategic sectors of the national economy. For this purpose, public enterprises have been set up in transportation, communication, energy, petro-chemicals, and other key and basic industries. . Development of backward Areas: Several public enterprises were established in backward areas to reduce regional imbalances in development. Balanced development of different parts of the country is necessary for social as well as strategic reasons. 4. Employment generation: Unemployment has become a serious problem in India. Public enterprises seek to offer gainful employment to millions. In order to protect jobs, several sick units in the private sector have been nationalised. 5. Economic surplus: Public enterprises seek to generate and mobilise surplus for reinvestment. These enterprises earn money and mobilise public savings for industrial development. 6. Egalitarian society: An important objective of public enterprises is to prevent concentration of economic power and growth of private monopolies. Public sector helps the Government to enforce social control on trade and industry for ensuring equitable distribution of goods and services. Public enterprises protect and promote small scale industries. 7. Consumer welfare: Public enterprises seek to protect consumers from exploitation and profiteering by ensuring supply of essential commodities at cheaper prices. They aim at stabilising prices. 8. Public utilities: Private sector is guided by profit motive. Therefore, it is reluctant to invest money in public utility services like water supply, gas, electricity, public transport. Therefore, the Government has to assume responsibility for providing such services. 9. Defence: Government has to set up public enterprises for production of defence equipment. Supply of such equipment cannot be entrusted for private sector due to the need for utmost secrecy. 10. Labour welfare: Public enterprises serve as model employers. They ensure welfare and social security of employees. Many public enterprises have developed townships, schools, college and hospitals for their workers. Role and Rationale of Public Enterprises The public sector has been playing a vital role in the economic development of the country. In fact the public sector has come to occupy such an important place in our economy that on its effective performance depends largely the achievement of the countrys economic and social goals. Public sector is considered a powerful engine of economic development and an important instrument of self-reliance. The main contributions of public enterprises to the countrys economy may be described as follows: 1. Filling of gaps: At the time of independence, there existed serious gaps in the industrial structure of the country, particularly in the field of heavy industries. Basic and key industries require huge capital investment, involve considerable risk and suffer from long gestation periods. Private sector concerns do not come forward to establish such industries. Public sector has helped to fill up these gaps. The basic infrastructure required for rapid industrialisation has been built up, through the production of strategic capital goods. The public sector has considerably widened the industrial base of the country and speeded up the pace of industrialisation. 2. Employment: Public sector has created millions of jobs to tackle the unemployment problem in the country. Public sector accounts for about two-third of the total employment in the organised industrial sector in India. By taking over many sick units, the public sector has protected the employment of millions. Public sector has also contributed a lot towards the improvement of working and living conditions of workers by serving as a model employer. 3. Balanced regional development: Private industries tend to concentrate in certain regions while other regions remain backward. Public sector undertakings have located their plants in backward and untraded parts of the country. These areas lacked basic industrial and civic facilities like electricity, water supply, township and manpower. Public enterprises have developed these facilities thereby bringing about complete transformation in the social-economic life of the people in these regions. Steel plants of Bhilai, Rourkela and Durgapur; fertilizer factory at Sindri, machine tool plants in Rajasthan, precision instruments plants in Kerala and Rajasthan, etc. are a few examples of the development of backward regions by the public sector. 4. Optimum utilisation of resources: Public enterprises make better utilisation of scarce resources of the country. They are big in size and able to enjoy the benefits of large scale operations. They help to eliminate wasteful completion and ensure full use of installed capacity. Op timum utilisation of resources results in better and cheaper production. 5. Mobilisation of surplus: The profits earned by public enterprises are reinvested for expansion and diversification. Moreover, public sector concerns like banks and financial nstitutions mobilise scattered public savings thereby helping the process of capital formation in the country. Public enterprises earn considerable foreign exchange through exports. 6. Self reliance: Public enterprises have reduced considerably the need for imports by producing new and better products within the country. These enterprises are also earning considerable amount of foreign exchange through exports. 7. Socialistic pattern of society: Public sector is an instrument for realising social objectives. Public enterprises help to check concentration of wealth and private monopolies. These enterprises can serve as powerful means of economic and social change. 8. Public welfare: Public enterprises help in the establishment of a welfare state in the country. These enterprises supply essential commodities at cheaper rates. A proper balance between demand and supply is created to protect consumers against exploitation by profit hungry businessmen. Public enterprises also protect and promote the interests of workers. Criticism of Public Enterprises [Arguments against Public Enterprises] Public enterprises are opposed on account of weaknesses in their organisation and working. These enterprises generally suffer from the following problems: 1. Delay in completion: Often a very long time is taken in the establishment and completion of public enterprises. Delay in completion leads to increase in the cost of establishment and benefits extracted from them are delayed. 2. Faulty evaluation: Public enterprises are in some cases set upon political considerations. There is no proper evaluation of demand and supply and expected costs and benefits. There are no clear cut objectives and guidelines. In the absence of proper project planning there is under- utilisation of capacity and wastage of national resources. . Heavy overhead costs: Public enterprises often spend huge amounts on providing housing and other amenities to employees. Though such investment is useful for employees but it takes away a large part of capital and the project suffers from financial difficulties. 4. Poor returns: Majority of the public enterprises in India are incurring loss. In some of them the profits earned do not yield a reasonable return on huge investment. Lack of effective financial controls, wasteful expenditure and dogmatic pricing policy result in losses 5. Inefficient management: Due to excessive centralisation of authority and lack of motivation public enterprises are managed inefficiently. High level posts are often occupied by persons lacking necessary expertise but enjoying political support. 6. Political interference: There is frequent interference from politicians and civil servants in the working of public enterprises. Such interference leaves little scope for initiative and freedom of action. Public enterprises enjoy little autonomy and flexibility of operations. 7. Labour problems: In the absence of proper manpower planning public enterprises suffer from over-staffing. Jobs are created to fulfil employment goals of the Government. Guarantee of job in these enterprises encourages trade unions to be militant in pursuing their aims. Growth of Public Enterprises in India At the time of independence, public sector in India was confined mainly to railways, communications, defence production and public utility services. Since then the growth of public enterprises has been very rapid. Now public sector consists of public utilities (e. g. , railways, post and telegraph, etc), manufacturing concerns (e. g. , BHEL, SAIL, etc. ), trading organisations (e. g. STC, MMTC, etc. ), service organisations (e. g. , NIDC, RITES, etc. ). SAIL, a Maharatna Company of Govt. of India, is the worlds leading and Indias largest steel producer with an annual turnover of around Rs. 50,348 crore (FY11-12). It operates and owns 5 integrated steel plants at Rourkela, Bhilai, Durgapur, Bokaro and Burnpur and 3 special steel plants at Salem, Durgapur and Bhadravati. As part of its g lobal ambition the Company is implementing a massive expansion plan involving project work of building/adding new facilites with emphasis on state of the art green technology. List of Maharatna, Navratna and Miniratna CPSEs As per available information (as on February, 2013) Maharatna CPSEs Bharat Heavy Electricals Limited Coal India Limited GAIL (India) Limited Indian Oil Corporation Limited NTPC Limited Oil amp; Natural Gas Corporation Limited Steel Authority of India Limited Navratna CPSEs Bharat Electronics Limited Bharat Petroleum Corporation Limited Hindustan Aeronautics Limited Hindustan Petroleum Corporation Limited Mahanagar Telephone Nigam Limited National Aluminium Company Limited NMDC Limited Neyveli Lignite Corporation Limited Oil India Limited Power Finance Corporation Limited Power Grid Corporation of India Limited Rashtriya Ispat Nigam Limited Rural Electrification Corporation Limited Shipping Corporation of India Limited Miniratna Category I CPSEs Airports Authority of India Antrix Corporation Limited Balmer Lawrie amp; Co. Limited Bharat Dynamics Limited BEML Limited Bharat Sanchar Nigam Limited Bridge amp; Roof Company (India) Limited Central Warehousing Corporation Central Coalfields Limited Chennai Petroleum Corporation Limited Cochin Shipyard Limited Container Corporation of India Limited Dredging Corporation of India Limited Engineers India Limited Ennore Port Limited Garden Reach Shipbuilders amp; Engineers Limited Goa Shipyard Limited Hindustan Copper Limited HLL Lifecare Limited Hindustan Newsprint Limited Hindustan Paper Corporation Limited Housing amp; Urban Development Corporation Limited India Tourism Development Corporation Limited Indian Railway Catering amp; Tourism Corporation Limited IRCON International Limited KIOCL Limited Mazagaon Dock Limited Mahanadi Coalfields Limited Manganese Ore (India) Limited Mangalore Refinery amp; Petrochemical Limited Mishra Dhatu Nigam Limited MMTC Limited MSTC Limited National Fertilizers Limited National Seeds Corporation Limited NHPC Limited Northern Coalfields Limited Numaligarh Refinery Limited ONGC Videsh Limited Pawan Hans Helicopters Limited Projects amp; Development India Limited Railtel Corporation of India Limited Rashtriya Chemicals amp; Fertilizers Limited RITES Limited SJVN Limited Security Printing and Minting Corporation of India Limited South Eastern Coalfields Limited State Trading Corporation of India Limited Telecommunications Consultants India Limited THDC India Limited Western Coalfields Limited WAPCOS Limited Miniratna Category-II CPSEs Bharat Pumps amp; Compressors Limited Broadcast Engineering Consultants (I) Limited Central Mine Planning amp; Design Institute Limited Ed. CIL (India) Limited Engineering Projects (India) Limited FCI Aravali Gypsum amp; Minerals India Limited Ferro Scrap Nigam Limited HMT (International) Limited HSCC (India) Limited India Trade Promotion Organisation Indian Medicines amp; Pharmaceuticals Corporation Limited M E C O N Limited National Film Development Corporation Limited National Small Industries Corporation Limited P E C Limited Rajasthan Electronics amp; Instruments Limited

Comparison Of Building Vulnerability Assessment Methods Engineering Essay

Comparison Of Building Vulnerability Assessment Methods Engineering Essay A review of vulnerability assessment methods for buildings is conducted out with a view to evaluate their appropriateness for use in seismic risk assessment. A ranking scheme has been developed to score each vulnerability assessment method. The ranking considers general description of vulnerability, building response factors, variance in output, applicability and ease of use, which are the major characteristics for vulnerability assessment tools used in seismic risk assessment. A case study in the older portion of Dhaka city, Bangladesh has been conducted to investigate the efficiency of some state-of-the- art vulnerability assessment methods. The hybrid vulnerability scale, which uses a FEMA 310 and IITK GSDMA approaches score high in the ranking, whilst the other scales based on the Rapid Visual Screening FEMA 154, Euro Code 8, New Zealand Guidelines, Modified Turkish Method and NRCC perform differently in various weighting scenarios. However, it is found that none but the hybrid ( which includes the local site specific issues as well as the results from non destructive testing and experimental data) method effectively suits all the criteria essential for their use in seismic risk assessment, especially emphasis on physical vulnerability factors, applicability and variances in output. Keywords vulnerability assessments, physical vulnerable parameters, seismic risk assessment 1. Introduction Seismic risk assessment is a vital tool to manage the growing risk in the face of the ever-increasing exposure in highly seismic regions. Due to the changes in the built environment and continuously evolving seismic sciences, it is essential to refine the risk assessment modeling continuously. In particular, vulnerability of buildings to ground shaking is recognized as a key element in any seismic risk model (Spence et al. 2008). Therefore, seismic vulnerability assessment is an essential tool for governments and individuals to mitigate the consequences of earthquakes. Existing vulnerability assessment methodologies vary with various postulations proposed for the characterization and prediction of earthquake hazard and the methodology used to evaluate building regarding the hazard (FEMA 1999; Bertogg et al. 2002). The development of a region-wide seismic vulnerability assessment framework, such as FEMA 310 for the US (FEMA 1999), requires a unique vulnerability assessment tool to acc ommodate all the above mentioned issues. Within this paper, a comparison and critical review of existing vulnerability assessment methodologies for buildings is conducted out, with a view to their utilization in a region-wide seismic risk assessment. A hybrid method consisting of FEMA 310 (FEMA 1999) and IITK GSDMA (Durgesh 2005) has been set up to evaluate vulnerability, combining an analysis of building typologies with expert judgment. Background information on the most significant vulnerability assessment methods are provided in the paper together with their advantages and disadvantages for use in seismic risk assessment. Moreover, the seismic vulnerability for contemporary and historical 93 buildings in old Dhaka City, Bangladesh has been assessed as a case study to show the spatially distributed qualitative risk within the area with the help of different vulnerability assessment tools. Finally, a scoring method is proposed to qualitatively represent the relative rankings of the selected vulnerability assessment tools t o find out a suitable uniform approach to be used for seismic risk assessment. 2. Selection of suitable building classification system Vulnerability can be defined as the susceptibility of buildings to damage in presence of seismic ground motion (Hill and Rossetto 2008). The evaluation of building vulnerability is a basic part of any risk assessment methodology. An accurate, transparent and conceptually sound algorithm for assessing the seismic vulnerability of the building stock is one of the main ingredients in a seismic risk model and indeed over the past 30 years many tools and methodologies have been proposed for this purpose. This study takes an overview on some of the most noteworthy contributions in the field of vulnerability assessment and the key advantages and disadvantages of these procedures have been identified in order to distinguish the main characteristics of an ideal methodology (Calvi et al. 2006). In vulnerability studies, it is essential to differentiate various building types, since, different types of buildings tend to respond in a different way under similar ground motions (Tesfamariam and Sa atcioglu 2008). Hence, the buildings should be classified according to their similar dynamic properties, before the conducting a vulnerability assessment of an urban area. The parameters that influence the dynamic response of a structure to ground motion are well recognized, for example, in Euro code 8 (BSSC 2003; CEN 2004), and embrace the structures geometrical and material properties. A building classification system that considers a high-degree of segregation in vulnerability studies and an enhanced estimate of the financial losses, has been expressed elsewhere (Carvalho et al. 2002). This study focuses on the dominant building types of the Indian region (Alam et el. 2010), which comprises mainly of reinforced concrete buildings and masonry buildings. 3. Existing seismic vulnerability assessment methodologies: an overview Table 1 in Appendix A briefly describes each vulnerability assessment tool selected and the rationale for their selection. It is obvious that the review is not extensive; however, the tools have been selected for the predominant building classes as well as to the contemporary practices in seismic vulnerability assessment of buildings. From the literature, it is evident that, there is a lack of unified vulnerability assessment technique, which covers the entire local as well as the global parameters. To cover the location-specific physical components present in both the developed and the developing countries, a hybrid method has been formulated for the vulnerability assessment of existing structures incorporating FEMA 310 (FEMA 1998, 2003, ASCE 1998) and IITK GSDMA (Durgesh 2005) methods. Other vulnerability assessment tools are chosen from a wide range of published and peer reviewed papers in seismology, structural vulnerability, and earthquake engineering fields. Since, most of the tools have been developed for some particular circumstances, such as vulnerability assessment in the field, for structural analysis etc. they may not contain some of the uniqueness specified in the scoring structure. However, they are included in this study, as either elements of these guidelines or tools have been used in past seismic vulnerability assessment of buildings or they illustrate a distinctive characteristic, which is essential in a tool for the seismic vulnerability assessment. 4. Investigation of the suitability of different vulnerability assessment tools: a case study A case study of 93 buildings of older portion of Dhaka city-the capital of Bangladesh (Alam et al. 2010) has been selected to evaluate the suitability of various vulnerability assessment tools for seismic risk assessment. The predominant structural types, specially associated with medium to high seismicity, present in South Asian countries have been presented in the building classification system. After considering building inventories of different countries of South Asian region, it was found that South Asian building inventory is primarily composed of reinforced concrete buildings and masonry buildings. The study includes Bangladesh (CDMP 2009), Nepal (AUDMP 2007), and India (Durgesh 2005) for classifying major building classes for the area. There exist some other types, such as adobe (mud house), tin-shed housing, timber and steel structures etc, which contribute a very small proportion of the existing inventory with moderate to high seismicity. The premier resolutions of relevant building type sub-categories for the vulnerability assessment are the reinforced concrete frames with and without masonry infill as well as the unreinforced masonry buildings for the study area. The seismic vulnerability of buildings in the stock varies widely with different vulnerable factors (Hugo 2002). The principal vulnerability factors used in the categorization of buildings in the study area are structure type (the main lateral force resisting system of buildings), number of story, and code level (seismic design standard applied in the design of buildings). Moreover, architectural features which are the parameters for defining geometry of buildings such as story height, span length, presence of open first-storey etc. act as factors for the vulnerability assessment. Several structural features may be considered as the factor affecting vulnerability of buildings. These factors include soft story, heavy overhang, short column, pounding possibility between adjacent buildings, and visible ground settlement. During this study a number of vulnerable factors were identified that are comprehensively discussed here. According to Turkish method (Bommer et al. 2002, Tesfamariam a nd Saatcioglu 2010), the level of building damage during earthquakes depends on the apparent building quality which is, in turn, related to the quality of construction materials, workmanships and building maintenance. Well-trained observers can classify a buildings quality roughly as good, moderate, or poor. Many building collapses during seismic events may be ascribed to the absence of the bracing elements (e.g. available walls in the upper floors) in the ground floor, and hence develop a ground floor soft in the horizontal direction. The plastic deformations at the plastic hinge points of the columns can develop an undesirable sway mechanism with a large concentration of the plastic deformations at the column ends (Hugo 2002). Hence, the soft story buildings exhibit a less safe behavior than the similar regular structures during moderate and severe earthquake. Normally, this situation can be resulted from the building that locates along the side of the main street as the first sto ry is being used for a commercial space that has opening between the frame members for customer circulation. Figure 1 shows some of the examples of soft story (ground floors being used as shop) in Shakhari Bazar, Dhaka, Bangladesh. In addition to soft stories, another vulnerable factor, termed as heavy overhanging floors in multistory buildings lead to irregularity in stiffness and mass distributions (Hugo 2002). From the earthquake engineering view point, these irregular plan shapes are undesirable as they cause inappropriate dynamic behaviors when subjected to horizontal earthquake ground motion. Typical heavy overhangs found in the old part of Dhaka City are shown in figure 2. Moreover, the shear failure of short columns is another major cause of building collapse during a seismic event (Hugo 2002). It is also termed as squat columns, i.e. columns having relatively high thickness compared to their height, and most of the cases are fixed in strong beams or slabs. By unintentional addition of parapet infill in frame structures, slender columns can also be converted into short columns. In case of short columns with significant bending capacity, enormous moment gradient can develop a large shear force under horizontal actions of a seismic event, which generally leads to a shear failure before the plastic moment capacity is being reached (Hugo 2002). It was observed after the August 17th, 1999 earthquake in Turkey (Mw=7.4) that a large number of buildings were damaged due to the presence of short columns (Saatcioglu et al. 2001). Damage due to pounding can also be observed after almost every earthquake events. Different vibration periods and non-synchronized vibration amplitudes cause the close buildings to knock together. Buildings subjected to pounding receive heavier damage on higher stories (NZSEE 2000, 2003). Topographic amplification may also increase ground motion intensity on hilltops during earthquake; hence, this factor should be taken into account in the seismic risk assessment. In the last not the least, building shape and elevation are major factors affecting buildings during an earthquake. It was evident from the experience of different seismic events, that the buildings with irregular shape are more damaging than the buildings of regular shape (Hugo 2002). Similarly elevation of building is also another important factor responsible for structural/building damage during an earthquake. Narrow tall buildings are more vulnerable during an earthquake (Hugo 2002). Figure 3 shows vertical irregularity of an existing building in the study area. There exists a numerous numbers of vulnerability assessment techniques, that utilize various types of vulnerability factors. Table 2 summarizes different vulnerability factors, which are frequently, used in different seismic vulnerability assessment techniques utilized in the study. From this study, it can easily be identified that some of the seismic vulnerability assessment techniques are very robust, e.g. FEMA 310, FEMA 154 etc, whereas in case of some other methods, (e.g. Euro Code 8) some of the major vulnerability parameters are not clearly defined. The results from the assessment of 93 buildings in the study area are depicted in the figure 4. For risk evaluation, it is required to collect, analyze and properly match a huge quantity of data. Geographic information system (GIS) can effectively be utilized to manage and overlay the information levels and graphical output of the results (Codermatz 2003). Therefore, a geographical information system (GIS) database has been developed to represent the spatial distribution of the vulnerable buildings for different assessment techniques within the study area. Figure 5 shows the distribution of vulnerable buildings in GIS environment, resulted with the use of FEMA 154 method, which shows that most of the buildings fall under very high risk group. Whereas, the distribution of risk classes within the buildings are in a wide range in case of hybrid method, depicted in figure 6. The distribution of vulnerable buildings assessed by Euro Code 8 and NRCC are also presented in figure 7 and figur e 8 respectively, which show comparatively lower risk variances. 5. Vulnerability assessment methodology scoring system The general description of vulnerability assessment methods which include the input variables, are very useful for the people involved in the field directly, where as the information about physical measurable parameters are necessary for the detailed analysis of a structure and the decision makers utilize the description of output for generating an effective decision (Hill and Tizina 2008). A reliability or performance scoring system has been developed to rank the vulnerability assessment methodologies according to the criteria mentioned above. The proposed scoring system consisting of 3 main sections with 17 sub-categories is depicted in Table 2 of Appendix A. The score obtained in each of the 3 sections is given equal weighting in the computation of the total reliability score for vulnerability assessment. The system tries to reduce most of the subjectivity implicated in the ranking of different vulnerability assessment methods. Since, some subjectivity has been utilized to assign the categories, the resultant scores can be utilized only as a qualitative representation of performance or reliability. To provide a clear indication of each methodologys performance or reliability, an affirmative score is given as 3 points, a moderate score is given as 2, a negative score 0 point, whereas the method partially fulfills the requirement is given 1 point. Since, experimental value provides data based on real-life experiences, it is more preferred in the scoring system. Analytical and judgment-based values are considered as second and third best respectively. For the sub-categories, the scoring is based on the Table 3 of Appendix A. This scoring for reliability or performance has been applied to the vulnerability assessment methods applicable for mainly reinforced concrete buildings as well as unreinforced masonry building types. Category A of the scoring system in Table 2 deals with the basic input description of vulnerability assessment tools, i.e. ease of measurement (Saatcioglu, et al. 2001), range of buildings types covered (FEMA 2002, ASCE 2003, UNDRO 1980), site specific factors, including local and global aspects regard (ASCE 2003, ASCE 1988, NRCC 1993, Durgesh 2005) .This is important for the people working in the field measurement. In category B mostly physical measurable vulnerability factors have been considered, which is very useful for analyzing the structural behavior. It deals with the scope of vulnerable parameters (ASCE 2003), quantity of database (ATC 2004), applicability of tools as non-structural components of the structures (NRCC 1993). Finally category C of the proposed scoring system utilizes the involvement of the output factors, which encompasses the well defined vulnerability scales (FEMA 2002) (ASCE 2003), risk variances (ASCE 2003, Durgesh 2005), impact of non-structural components as well as the adoptability (NRCC 1993). This category mainly focuses on the preferences for the decision makers. For different specific needs, risk assessment specialists may prefer different weightings on the scoring categories. The categories are weighted according to four different scenarios (I-IV) as depicted in Table 4 of Appendix A. These weightings give a maximum score of 51 points in each case which are only for illustrative indication. An example of use of the proposed scoring method is given in Table 5 of Appendix A. The final ranking for the vulnerability assessment tools considered is shown in Table 6 of Appendix A. The individual scores are given in Table 7 of Appendix A 6. Discussion on vulnerability assessment method scoring This section discusses about the performance of different vulnerability assessment tools in different scoring categories in wider aspect for all the weighting scenarios proposed. At this point it is essential to re-state that the vulnerability assessment ranking reflects how appropriate the method is for use in seismic risk assessment. To rank the techniques, several weighting scenarios have been utilized with the calculated scores. For weighting scenario I, equal weighting for each category was adopted which provides an overall view of the vulnerability assessment methods performances. The authors believe that each of the identified features is equally important and it is suggested that proposed scoring system utilizes this weighting scenario. Hybrid method, NRCC (NRCC 1993) guidelines and FEMA 154 (FEMA 2002, ATC 1998) rank the top three positions for the weighting scenario I. The Hybrid method contains detailed descriptions for different classes of buildings and has a well defined methodology for calculating physical vulnerability factors. The ASCE 31 standard (FEMA 310) is not a building code.  Ã‚  It is a method of evaluating existing buildings to determine if they meet seismic performance objectives such as Life Safety or Immediate Occupancy.   NRCC guideline follows the similar principles as the hybrid one; however, the calibration for building typology for NRC guidelines considers the Canadian construction practice. Fundamentally, the score ( seismic priority index) in NRCC is related to the seismic risk for a particular building, given the occurrence of an earthquake equivalent to that specified in the National Building Code of Canada (NRCC 1993). It is to be used as an initial assessment for deciding which building should have more detailed evaluation in order of priority. Moreover, the effect of torsional irregularities has not been taken in to account. In FEMA 154, the score was affected by the lack of sufficiently detailed analysis; rather it e ncompasses a rapid visual screening method (FEMA 2002). The use of seismicity regions, rather than site-specific seismic hazard data, for the Rapid Visual Screening (RVS) procedure substantially reduces the accuracy of results because the calculations use levels of ground motion which differ from the levels of ground motion at all sites except those where ground motions are at the median value for a seismicity region. Thus, RVS final scores are systematically shifted and overestimate the level of risk for locations with below-median ground motions and underestimate risk for locations with above median ground motions. In case of weighting scenario II, more weighting is given to general description of vulnerability to highlight the methods suited for in-field measurements. For weighting scenario II, again the same results happened, i.e. Hybrid one out ranked all other approaches. For weighting scenario III, more weighting values have been given to the physical vulnerable parameters. And in case of scenario IV, weighting has been given to the variance in output. For this purpose, a case study of 93 buildings of old Dhaka city of Bangladesh has been conducted. In this case study, different types of buildings have been assessed with various methodologies. Here, Hybrid and NRCC Guidelines ranked the 1st where as FEMA 154 (FEMA 2002, ATC 1998) and NZ Code ranked 2nd and 3rd. The variation and the results of the assessment have been depicted in Figure 5 through Figure 8. In weighting scenario V, more conscious was given to Canadian present construction practices (Cook 1999, Onur et al. 2004). Here, the Hybrid as well as the NRCC method outranked the other methods. 7. Scoring Summary with Different Multi Criteria Decision Making Tools The proposed scoring system is a wide-ranging tool to compare different vulnerability assessment methods in the context of ease of use and applicability. It cannot catch all the parameters, but qualitatively gives a better indication of the suitable seismic vulnerability assessment method for buildings. First of all, it can be remarked that, the positions of the methods in the ranking change markedly between the different weighting scenarios. Of the considered seismic vulnerability assessment methods, it is seen that the Hybrid method composed of FEMA 310 (FEMA 1998, 2003, ASCE 1998) and IITK-GSDMA outperforms other vulnerability assessment in all respects. However, NRCC (NRCC 1993) method also performs adequately, where the guideline was developed specifically with Canadian buildings in mind, though certain features are lacking within the description of detailed analysis. Nonetheless, for all the weighting scenarios, the proposed hybrid method performs well and should be considered as the preferred alternative. Moreover, the presence of FEMA 154, Euro Code 8(Milutinovic and Trendafiloski 2003, CEN 2004) and New Zealand Guidelines (NZSEE 2000, 2003) in the ranking system are notable. However, it is clear that the methods do not capture a sufficient quantity of characteristics that are required of such a guideline for the particular weighting scenarios. In this study different multi criteria decision making tools (e.g. AHP. Elctre I Is, and TOPSIS) have been utilized to find out the suitable most alternative. The Analytical Hierarchy Process (AHP) is a decision-aiding method developed by Saaty (Saaty 1980). The main goal of AHP is to quantify the relative priorities for a given set of alternatives on a ratio scale, based on the judgment of the decision-maker, and stresses the significance of the perceptive judgments of a decision- maker as well as the consistency of the comparison of alternatives in the decision-making process (Saaty 1990). Whereas ELECTRE I (Benayoun et al, 1966; Roy 1971) is an overall method of ranking alternative systems in the presence of qualitative criteria. The idea in this algorithm is to choose those nodes (i.e. alternative systems) which are preferred for most of the criteria and yet do not cause an unacceptable level of discontent for any one criterion. Moreover in case of TOPSIS (Technique for Order pre ference by Similarity to Ideal Situation) method, the selected alternative should be as close to the ideal solution as possible and as far from the negative-ideal solution as possible. The ideal solution is formed as a combination of the best performance values revealed in the decision matrix by any option for each attribute. The negative-ideal solution is the combination of the worst performance values. Propinquity to each of these performance poles is measured in the Euclidean sense (e.g., square root of the sum of the squared distances along each axis in the attribute space), with elective weighting of each attribute (Olson 2004). By utilizing Electre I Is (Hwang and Yoon 1981) and Analytical Hierarchy Process (Yang and Lee 1997); it was found that the proposed hybrid method outranks all the methods in all cases (Figure 10 and Figure 11). Finally TOPSIS method (Chu 2002) has validated the same decision about the proposed hybrid method to be the preferred one. In the context of decision making and field measurement, hybrid method consisting of FEMA 310 (FEMA 1998, 2003, ASCE 1998) and IITK-GSDMA is recommended. Whereas, if the rapid assessment of buildings is the major concern, vulnerability assessment through FEMA 154 (FEMA 2002, ATC 1998) and NRCC (NRCC 1993) guidelines should also be considered as the preferred options. 8. Conclusion This study has identified significant characteristics that should be included for an appropriate seismic vulnerability assessment method of buildings. A scoring system has been proposed for the qualitative review of various vulnerability assessment techniques and a particular attention was given to potential use in Canada. It is found that a vulnerability assessment technique termed as hybrid method i.e. combination of FEMA 310 (FEMA 1998, 2003, ASCE 1998) IITK GSDMA (Durgesh 2005) captures characteristics to a wider degree that a suitable vulnerability assessment method should posses. However, the proposed hybrid method is calibrated with the data from US and Bangladesh, which can be applied to other regions with slight modifications. In seismic risk assessment, the building vulnerability assessment depends on data from many sources, amongst which, the past earthquake damage survey data are of major concern. Existence of various vulnerability assessment approaches, raises concern over worldwide to have a simplistic effective vulnerability assessment tool, to be useful world-wide. The authors believe that the proposed hybrid method provides a robust basis for vulnerability interpretation and recommended future studies of vulnerability assessment method to combine more consistent and wider descriptions of the parameters for use in seismic risk assessment. Reference: Alam M.J., M. Abdur Rahman Bhuiyan, and M.Roqibul Islam(2006) Seismic Structural Assessment of Damaged Chittagong Public Library Building During 27 July 2003 Earthquake 4th International Conference on Earthquake Engineering Taipei, Taiwan Alam M. N., K. Mashfiq, A. Rahman, and S. M. Haque , (2010)Seismic vulnerability assessment of buildings in heritage and non-heritage areas in the older part of Dhaka city, 3rd International Earthquake Symposium, Bangladesh Dhaka, March 5-6, 2010, ISBN: 978-984-8725-01-6 ATC (1987), Evaluating the seismic resistance of existing buildings, ATC 14. Applied Technology Council, Redwood City, California. ASCE (2003), Sismic evaluation of buildings, ASCE/SEI 31-03. Structural Engineering Institute of the American Society of Civil Engineers, Reston, Virginia. ASCE (1988a). Rapid visual screening of buildings for potential seismic hazards: a handbook, published by the Federal Emergency Management Agency, FEMA-154, Washington, D.C. ATC 21 (2004), Rapid visual screening of buildings for potential seismic hazards training manual, ATC-21-T, FEDERAL EMERGENCY MANAGEMENT AGENCY Washington, DC ASCE (1998), Handbook for the seismic evaluation of buildings a pre-standard, American Society of Civil Engineers for the Federal Emergency Management Agency, FEMA 310 Report, Washington D.C. ASCE (2003), Seismic evaluation of buildings, ASCE/SEI 31-03, Structural Engineering Institute of the American Society of Civil Engineers, Reston, Virginia. ATC-21 (1998), Rapid visual screening of buildings for potential seismic hazards: a handbook, Applied Technology Council, Redwood city, CA, USA. AUDMP (2007), www.adpc.net/audmp/audmp.html Benayoun, R., Roy, B. Sussmann, B. (1966) ELECTRE: une mà ©thode pour quiderle choix en presence de points de vue multiples. Sema (Metra International), Dir. Sci., Note de Travail No. 49, Paris, France. Bertogg M, Hitz L, Schmid E (2002), Vulnerability functions derived from loss data for insurance risk modelling: findings from recent earthquakes. In: Proceedings of the twelfth European conference on earthquake engineering (paper 281), London, September 2002 BIS (2002), IS 1893 (Part I)- Indian standard criteria for earthquake resistant design of structures part I general provisions and buildings, Bureau of Indian Standards, New Delhi. Bommer J, Spence R, Erdik M, Tabuchi S, Aydinoglu N, Booth E, Del Re D, Peterken O, (2002), Development of an earthquake loss model for Turkish catastrophe insurance, J Seismol 6:431- 36 Building Seismic Safety Council National Institute of Building Sciences (BSSC) (2003) NEHRP recommended provisions and commentary for seismic regulations for new buildings and other structures, 2003 Edition (FEMA 450). Washington New Zealand Government (2004), Building Act, Wellington, New Zealand Calvi, G. M., Pinho, R., Magenes, G., Bommer, J. 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Scheduling And Progress Monitoring Analysis Construction Essay

Scheduling And Progress Monitoring Analysis Construction Essay Effective project management is important in order to ensure that projects are delivered within budget, time and to the agreed quality. It demands a comprehensive understanding of the key stages, which are critical to success, in the life cycle of a construction project. In aid of achieving good planning takes time, but it ensures that the project will be on budget, on time and also risks are minimised. It makes sure that organisational values and client requirements are clear and understood. Good planning has as a result to reduce waste deliver better design. Furthermore, it helps the project team to manage better with risks as they happen, which otherwise possibly will cause greater delay and increased costs (Office of Government Commerce, 2003). This section describes the scheduling and progress monitoring activities for managing the project with supporting processes like as change control. The schedule is also known as the time plan. The project sponsor, through the project manager, is responsible for scheduling and monitoring progress. A programme, in the context of construction projects, is a schedule that identifies the work to be carried out as a series of activities and plots the time periods required to execute and complete each activity and the interdependencies between each activity (Office of Government Commerce, 2003). Schedule is a diagrammatic representation of activities and their time relationship. Also, schedule is known as project programme. (Construction Industry Council, 1996). A programme also controls resources needed and their availability. It is essential to know possible risks or problems. The project manager must check the schedule and progress monitoring against progress already achieved in aid of understanding where difficulties and risks are possibly to arise and to establish different course of action in order to reduce their impact. (Office of Government Commerce, 2003). Risk management is a core process within any business or organization regardless of size, activity or sector. Individuals and organizations can lose substantial sums of money as a result of not paying sufficient attention to the identification and management of threats to their goals and to the projects they commission. Similarly, full advantage cannot be taken of potentially beneficial opportunities arising in the course of their activities if these are not recognized in good time. The project sponsor must be capable to identify those tasks that lie on the critical path. Critical path is the shortest possible time based on hypothesis about the tasks to be carried out and the resources available. Time for the processes should be integrated as specific activities in the schedule of the project. The schedule is an estimate that is based on considered assumptions on issues such as likely risk (Office of Government Commerce, 2003). Some estimation might prove to be wrong. Some deviations might be expected but these will accepted if they do not affect the critical path and the project is finished on time. Techniques include bar and Gantt charts and network planning help with progress monitoring. Bar and Gantt charts define an uncomplicated view of activities aligned with timetables. Network planning is especially useful for complex projects because it links dependent activities in a logical order (Office of Government Commerce, 2003). The project sponsor must make an effort in order that final schedule to be simple and straightforward. The networks of activities of the final schedules, and the interrelationships between them should be sophisticated and comprehensive. They must be rapidly understood of the project sponsor that is why color-coded bar charts are used as management control documents (Office of Government Commerce, 2003). Schedule planning tasks The project manager must report on schedule planning to the project sponsor on behalf of the project team. The project manager must produce a work breakdown structure (WBS). WBS defines the work content of the project in terms of basic elements, work packages, generic tasks and detailed tasks (Office of Government Commerce, 2003). The main schedule planning must show how elements affect each other. It defines activities and also establishes the logical relationships of the activities. It determines the work content, the duration and the required resources of each activity. Furthermore, it also defines the critical path, which determines the duration of the project. Finally, it can optimize the time plan by resource leveling. Resource leveling compares the calculated requirements with those actually available and recalculates the network to spread resources more evenly (Office of Government Commerce, 2003). Progress monitoring Progress monitoring includes reviewing monthly progress reports produced by the project manager with others in the integrated project team (Office of Government Commerce, 2003). Progress monitoring must focus on critical activities and warn the SPOs attention in the proper time in order to appropriate actions to be taken as soon as possible. The project sponsor must understand the total rate of the whole progress in order to judge the forecast completion date. In order to measure the progress, the percentage completion of an activity can be measure in terms of cost and time. The planned progress must be compared with the actual progress. Also progress can be measure the work in progress by taking account of milestones of the project. Any impact on critical must be checked in order to finish the project on time. Furthermore progress can be monitored by the payment progress and from resources still required. (Office of Government Commerce, 2003). An essential element of process monitoring is the process of tome control. A time control system can cover time budget, time plan and time checking. Time budget represents the overall project duration as developed by specific constrains of the project in the contract strategy. It is the period which fixed one time and from that moment becomes one of the most important parameters for management of the project. Time plan is a division of total time into interlinked time allowances for identifiable activities, which can be defined start and finish points. Time checking is monitoring the time actually spent on each activity and compared it with the allowance in the time plan. If any divergence is identified, it must be reported as soon as possible. (Office of Government Commerce, 2003). In the case that an activity on the critical path exceeds its time allowance later activities must re-sequenced, or try to shorten the planned time for future critical activities by increasing the resources (extra cost) for the specific activities. If neither is possible to be done, the project will finish late. The project sponsor must understand that time control is as essential during the planning stages as the construction stages of the project. (Office of Government Commerce, 2003). Progress reports Progress reports are essential reports in the whole process of the project, because they keep the project sponsor informed about the project progress. They discover problems and choices for their resolution. Additionally, they provide the necessary information to enable the project sponsor to make decisions on time. Progress reports demonstrate that the integrated project team executes their responsibilities properly and that the management processes procedures and controls are operating successfully. They provide an authority, and a communication tool in a simple and comprehensive format, for the whole project team. Furthermore they provide a time reference for meetings and plans. In addition the gathering of statistics by the department permits external monitoring and identify best practice and support of improvement in performance. (Office of Government Commerce, 2003). Change control Change can be handled most successfully through project planning and control. Change for any reason must be treated as a project risk. Changes to design, especially after contract award, are one of the major causes of time and cost overruns and poor value for money. Changes arise mainly as a result of unclear or ambiguous project definition, poor communication, inadequate time spent in project planning and risk management, or changing circumstances (Office of Government Commerce, 2003). Changes can be reduced by making sure that the project brief is comprehensive and has the stakeholders agreement. They can be minimized by taking account of present and proposed legislation. Furthermore, early discussions with stakeholders must be done in the early stages in order to anticipate their requirements. Site investigations and conditions surveys must be undertaken early in the stages. The designs must adequately develop early in the project and definably before constructions plans are committed. Finally, a proactive project management in order to identify and managing risks will have as a result to minimize changes (Office of Government Commerce, 2003). A change control procedure must consider the factors, which will mention below, before approval is given for the change. It must taking account of the reasons for the change, and for its source, which is responsible for wanting the change. The consequences of the change in terms of quality, cost and time. It must consider the risks and their impacts associated with the change. In addition, alternatives to the proposed change must be evaluated properly. It must checked proposals for avoiding time overrun and source of funding of any cost overrun. Finally, it must consider client approval for the change. After a detailed evaluation of the change confirms that it offers value of money and that the client accepts any impacts the approval of the change is given by SRO. Furthermore, the investment decision maker will approve any additional funding which exceeds the amount allowed in the risk allowance.

Violent Literature of the 1960s Essays -- Violence Vietnam War Litera

Violent Literature of the 1960's Like any idealistic movement of the 1960’s the anti war movement began as an impassioned protest. Peaceful rhetoric dictated by the emerging counter culture lined its foundations, propelling it into existence and giving it such hope and fervor it was impossible to ignore. Causes such as this were the catalyst for togetherness and comradery within and around communities. The Free Speech Movement set the stage for this national awakening, forcing the public to open their eyes to the issues at hand. Mario Savio’s cries for action rung out in the ears of the country, sparking an uprising of young idealistic believers; they had to put a stop to a war already reeking of death. Some of the most honest literature was created during the anti war movement, narrating the course of emotional attachment and dedication individuals felt. As Andrew Gordon wrote: â€Å"The time was ripe, America was ours, and we were going to change the world: Paradise Now or Apocalypse Now† (Por table Sixties Reader 231). The Free Speech Movement (FSM) began as a simple protest of the unjust enforcement of laws by school officials. Peaceful civil disobedience bled into more direct action as the cause grew, drawing increasing support from students and the surrounding community. Mario Savio sat in the center of this whirlwind transfer of power and emotion, summoning from within himself a passion that soon took hold of the Berkeley campus. The FSM became more than just a movement to gain rights; it became a national anthem of student progress and the ability to truly change an institution. Prior to entering Sproul Hall, student demonstrators listened as Savio fervently called them into action: There is a time when the op... ...both literally as well as through literature. Peace was born of idealistic individuals willing to fight with their words and diplomatic actions. This peace then mutated into a revolutionary society filled with radical leaders calling for violence to stop the war; a proverbial situation where fire was being used to fight fire. This flourish of harmony that existed throughout the country was inevitably weak, equipped to break at any moment. Thompson writes of this disintegration: â€Å"†¦with the right kind of eyes you can almost see the high-water mark—that place where the wave finally broke and rolled back† (Thompson 68). Literature from the 1960’s stands today as some of the most powerful narration of the domestic struggle out country witnessed. It documents the rocky movements of students and communities alike and paints an amazing picture of the battle to end the war.

Moving Away at a Young Age Essay -- Personal Narrative Moving Essays

Moving Away at a Young Age Moving far away from family and friends can be tough on a child at a young age. It has its pros and cons. One learns how to deal with moving away from the people they love and also learn how to deal with adjusting to new ways of life. Everything seems so different and at a young age one feels like they have just left the whole world behind them. That was an experience that changed my life as a person. It taught me how to deal with change and how to adjust. It developed me from a young boy into a mature young man.   Ã‚  Ã‚  Ã‚  Ã‚  The day I moved away, a lot of things were going through my young mind. As I took my last look at my home, I remembered all the fun times I had with my family and friends through out my life. Now I was moving 800 miles away from all of that with no insight on what lied ahead for me. As my family and I drove away from our Michigan home, I looked out the window wondering what Virginia would be, and what my friends were doing. A lot of things were going through my mind at the time. At the time my main worry was if I would make any friends, and how I would adjust to everything. During the whole drive down, my mother would often let me know that everything would be all right and I would like it. Trying to be strong and hold back my tears, I just shook my head no, wondering why we had to move so far away. Life would be different for me and I knew it would. Adjusting to an atmosphere and new people had its ups and downs. Everybody ta...

Mba Exam Papers in Operation and Production Management

i will give you full payment of 90 dollar if my below questions answers received from your side with chart and table where its required to fulfill my required. SUB: OPERATION MANAGEMENT 1. How would operations strategy for a service industry be different if any from that for a manufacturing industry? (It’s an example & explains) 2. Consider the following two mutually exclusive projects. The net cash flows are given below: NET CASH FLOWS years PROJECT A FROM PROJECT B 0 – Rs. 1,00,000 – Rs. 1,00,000/- 1 + Rs. 30,000 + Rs. 15,000/- 2 + Rs. 35,000 + Rs. 7,500/- 3 + Rs. 40,000 + Rs. 20,000/- 4 + Rs. 45,000 + Rs. 22,500/- 5 + Rs. 25,000/- 6 + Rs. 27,500/- 7 + Rs. 30,000/- 8 + Rs. 32,500/- If the desired rate of return is 10% which project should be chosen? 3. What are the levels of aggregation in forecasting for a manufacturing organization? How should this hierarchy of forecasts be linked and used? AN ISO 9001 : 2008 CERTIFIED INTERNATIONAL B-SCHOOL 4. How would fore casting be useful for operations in a BPO (Business processes outsourcing) unit? What factors may be important for this industry?Discuss. 5. A good work study should be followed by good supervision for getting good results. Explain with an example. 6. What is job evaluation? Can it be alternatively used as job ranking? How does one ensure that job evaluation evaluates the job and not the man? Explain with examples? 7. What is the impact of technology on jobs? What are the similarities between job enlargement & job rotation? Discuss the importance of training in the content of job redesign? Explain with examples? 8. What is internet connectivity? Feature article about  Production ManagementHow is it important in to days business would with respect to materials requirement planning & purchasing? Explain with examples? 9. Would a project management organization be different from an organization for regular manufacturing in what ways? Examples. 10. How project evaluation different from project appraisal? Explain with examples. SUBJECT: Production Management 1. What are the different types of production/operation system? Where would each one of them be applicable? Give practical examples. 2. What is flexibility in operations function?Can it be one of the strategic weapons? Explain your response. 3. What is the distinction between accounting profit & economic profit? How is such a distinction linked with the concept of opportunity cost? 4. What is the difference between the Scanlon & rucker plans? 5. Productivity improvement is not a one shot project Do you agree with this statement? Discuss 6. Is supply chain management a philo sophy? Discuss 7. What is the aim of production planning? 8. What is forecasting? Elements of forecasting & Methods of forecasting?

Bugatti Veyron Essay

The Bugatti Veyron is a mid-engined car. The Super Sport version is the fastest road-legal production car in the world, with a top speed of 431 km/h. The original version has a top speed of 408.00 km/h. Designed and developed by Volkswagen Group and produced by Bugatti Automobiles SAS at their headquarters in Chà ¢teau Saint Jean in Molsheim (Alsace, France), the Veyron’s chief designer was Hartmut Warkuss, and the exterior was designed by Jozef Kabaň of Volkswagen, And much of the engineering work being conducted under the guidance of Bugatti Engineering chief Wolfgang Schreiber. Though commissioned by Volkswagen, this car is only sold through the Bugatti manufacturers and cannot be found at any Volkswagen dealer. The car is named after French racing driver Pierre Veyron, who won the 24 hours of Le Mans in 1939 while racing for the original Bugatti company. The â€Å"16.4† refers to 16 cylinders and 4 turbochargers. The Veyron features an 8.0 litre, quad-turbocharged, W16 cylinder engine, equivalent to two narrow-angle V8 engines . Each cylinder has four valves for a total of sixty four; the engine is fed by four turbochargers. According to Volkswagen Group, the Veyron engine produces 1,001 metric horsepower of motive power, and generates 1,250 N-m of torque while super sport edition produces 1,200 metric horsepower and torque of 1,500 N ·m and has a revised aerodynamic package. The transmission is a dual-clutch direct-shift gearbox ,computer-controlled ,automatic with seven gear ratios and a shift time of less than 150 milliseconds, built by Ricardo of England. The Veyron can be driven in either semi- or fully automatic mode. A replacement transmission for the Veyron costs just over US$120,000. It also has permanent four wheel drive. It uses special Michelin PAX run-flat tyres, designed specifically to accommodate the Veyron’s top speed, which cost US$25,000 per set. The tyres can be removed from the rims only in France, a service which costs US$70,000 The total engine in actual produces 3600 hp of which only 1/3rd is used for running the car and the remaining is in the form of heat. The Bugatti Veyron has a total of ten radiators. Top speed On 4 July 2010, Bugatti’s official test driver Pierre Henri Raphanel piloted the Super Sport edition and was clocked at an average of 431.072 km/h on the Volkswagen Group’s private Ehra-Lessien test track to establish the car’s top speed With representatives of the Guinness Book of Records on hand taking back the title from the SSC Ultimate Aero TT as the fastest production vehicle. All production models will be electronically limited to 415 km/h to protect the tyres. German inspection officials recorded an average top speed of the EB 16.4 version of 408.47 km/h during test sessions on the Ehra-Lessien test track on 19 April 2005. This top speed was verified by James May on Top Gear in November 2006, again at Volkswagen Group’s private Ehra-Lessien test track. When the car reaches 220 km/h, hydraulics lower the car until it has a ground clearance of about 9 cm (3.5 in). At the same time, the wing and spoiler deploy. In this handling mode the wing provides 3,425 Newton’s of down force, holding the car to the road. For top speed mode the driver must, while at rest, toggle a special top speed key to the left of the driver’s seat called as â€Å" second ignition† to unlock limiter of 350km/h.The rear spoiler retracts and angle of rear wing to horizontal is modified into 2 °, the front air diffusers shut, and normal 12.5 cm (4.9 in) ground clearance(i.e. Height from the ground ) drops to 6.5 cm (2.6 in). The Veyron’s brakes use cross drilled, radially vented carbon fibre reinforced silicon carbide (C/SiC) composite discs, manufactured by SGL Carbon, which have a much greater resistance to brake fade when compared with conventional cast iron discs. Bugatti claims maximum deceleration of 12.747 m/s2 on road tyres. At speeds above 200 km/h , the rear wing also acts as an airbrake, snapping to a 55 ° angle in 0.4 seconds once brakes are applied, providing an additional 6.66 m/s2 of deceleration equivalent to the stopping power of an ordinary hatchback. Bugatti claims the Veyron will brake from 400 km/h to a standstill in less than 10 seconds, though distance covered in this time will be half of a kilometre (third of a mile).