• Title/Summary/Keyword: index system

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Performance Index Analysis of Schedule Introducing EVMS (EVMS를 도입한 공정의 성과지수 분석)

  • Kim Young;Lee Young-Dae;Kim Sung-Hwan;Kim Jung-ki
    • Proceedings of the Korean Institute Of Construction Engineering and Management
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    • autumn
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    • pp.456-459
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    • 2002
  • It is lately issued studies on EVMS(Earned Value Management System) throughout construction industry, which is management system integrating cost and schedule effectively. So identifying importance and circumstance of introducing EVMS, CPI(Cost Performance Index) and SPI(Schedule Performance Index), which are critical components on schedule introducing EVMS, calculate and it intends to analyze the trend and problem of cost and time throughout project management, applying various statistical data analysis method.

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Reliability index for non-normal distributions of limit state functions

  • Ghasemi, Seyed Hooman;Nowak, Andrzej S.
    • Structural Engineering and Mechanics
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    • v.62 no.3
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    • pp.365-372
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    • 2017
  • Reliability analysis is a probabilistic approach to determine a safety level of a system. Reliability is defined as a probability of a system (or a structure, in structural engineering) to functionally perform under given conditions. In the 1960s, Basler defined the reliability index as a measure to elucidate the safety level of the system, which until today is a commonly used parameter. However, the reliability index has been formulated based on the pivotal assumption which assumed that the considered limit state function is normally distributed. Nevertheless, it is not guaranteed that the limit state function of systems follow as normal distributions; therefore, there is a need to define a new reliability index for no-normal distributions. The main contribution of this paper is to define a sophisticated reliability index for limit state functions which their distributions are non-normal. To do so, the new definition of reliability index is introduced for non-normal limit state functions according to the probability functions which are calculated based on the convolution theory. Eventually, as the state of the art, this paper introduces a simplified method to calculate the reliability index for non-normal distributions. The simplified method is developed to generate non-normal limit state in terms of normal distributions using series of Gaussian functions.

Phantom Protection Method for Multi-dimensional Index Structures

  • Lee, Seok-Jae;Song, Seok-Il;Yoo, Jae-Soo
    • International Journal of Contents
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    • v.3 no.2
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    • pp.6-17
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    • 2007
  • Emerging modem database applications require multi-dimensional index structures to provide high performance for data retrieval. In order for a multi-dimensional index structure to be integrated into a commercial database system, efficient techniques that provide transactional access to data through this index structure are necessary. The techniques must support all degrees of isolation offered by the database system. Especially degree 3 isolation, called "no phantom read," protects search ranges from concurrent insertions and the rollbacks of deletions. In this paper, we propose a new phantom protection method for multi-dimensional index structures that uses a multi-level grid technique. The proposed mechanism is independent of the type of the multi-dimensional index structure, i.e., it can be applied to all types of index structures such as tree-based, file-based, and hash-based index structures. In addition, it has a low development cost and achieves high concurrency with a low lock overhead. It is shown through various experiments that the proposed method outperforms existing phantom protection methods for multi-dimensional index structures.

The Process Capability Index of Minimum Base on the Multiple Measuring Locations (다수 위치 측정에서 최소 기준에 의한 공정능력지수)

  • Lee, Do-Kyung
    • Journal of Korean Society of Industrial and Systems Engineering
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    • v.34 no.4
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    • pp.114-119
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    • 2011
  • Process capability indices (PCls) have been widely used in manufacturing industries to provide a quantitative measure of process potential and performance. The previous studies have measured only one location on each part in the case of single variate. To calculate the reliable process capability, a couple of measuring locations on each part are required. In this paper, we propose a new system process capability index $SC_{pm}$ (m) which is the minimum value of the location PCls.

Regional Optimization of Forest Fire Danger Index (FFDI) and its Application to 2022 North Korea Wildfires (산불위험지수 지역최적화를 통한 2022년 북한산불 사례분석)

  • Youn, Youjeong;Kim, Seoyeon;Choi, Soyeon;Park, Ganghyun;Kang, Jonggu;Kim, Geunah;Kwon, Chunguen;Seo, Kyungwon;Lee, Yangwon
    • Korean Journal of Remote Sensing
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    • v.38 no.6_3
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    • pp.1847-1859
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    • 2022
  • Wildfires in North Korea can have a directly or indirectly affect South Korea if they go south to the Demilitarized Zone. Therefore, this study calculates the regional optimized Forest Fire Danger Index (FFDI) based on Local Data Assessment and Prediction System (LDAPS) weather data to obtain forest fire risk in North Korea, and applied it to the cases in Goseong-gun and Cheorwon-gun, North Korea in April 2022. As a result, the suitability was confirmed as the FFDI at the time of ignition corresponded to the risk class Extreme and Severe sections, respectively. In addition, a qualitative comparison of the risk map and the soil moisture map before and after the wildfire, the correlation was grasped. A new forest fire risk index that combines drought factors such as soil moisture, Standardized Precipitation Index (SPI), and Normalized Difference Water Index (NDWI) will be needed in the future.

A Study on the System Loss Minimizing Algorithm by Optimal Re-location of Static Condenser Using System Power Loss Sensitivity (계통손실 감소를 위한 전력용 콘덴서의 適正 再配置에 대한 연구)

  • 이상중;김건중;정태호;김원겸;김용배
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.44 no.1
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    • pp.21-24
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    • 1995
  • The larger and the more complicated the system size and configuration grow, the more serious the system loss problem becomes. Exessive system loss causes severs system voltage depression, which even may result in system voltage collapse. This paper proposes an effective tool for minimizing the system power loss by optimal re-location of the static condenser based on the system loss sensitivity index .lambda.$_{Q}$. It is possible to determine the optimal location and amount of VAR investment for minimizing the system loss by priority of .lambda.$_{Q}$ index given for each bus. Several computational techniques for avoiding divergency of the load flow solution are proposed. The loss sensitivity index .lambda.$_{Q}$ uses information of normal power flow equations and their Jacobians. Two case studies proved the effectiveness of the algorithm proposed.posed.

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An Exploratory Study on the Development of Evaluation Factors in Franchise System: Symbiosis Index (프랜차이즈 시스템의 평가 지표 개발을 위한 탐색전 연구 - 공생지수(symbiosis index)를 중심으로 -)

  • Choi, Sung-Sik;Kim, Hong-Seok;Ku, Bon-Hyuk;Lee, Weon-Ho;Na, Hwa-Sook;Han, Kyu-Chul
    • The Korean Journal of Franchise Management
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    • v.1 no.1
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    • pp.65-85
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    • 2010
  • The key success factors for Franchise Enterprise as a virtual company which is established based on franchise system are the competitiveness of sub-systems in franchise system such as franchisor, franchisee, vendor(supplier), and customer, and to sustain the symbiotic relationship among sub-systems. In this regard, evaluating franchise system is considered to be implemented in different contexts and methods comparing with extant evaluation system in franchise business which is more focused on the relationship between franchisor and franchisee. The flagship role of establishing franchise system is to be franchisor system, however, the symbiotic relationship among other sub-system including franchisee, vendor, and customer leads to successful Franchise Enterprise. The purpose of this study is to research existing evaluation systems for franchise business and to explore the model of evaluating franchise system, what is called, "Symbiosis Index".

The Development of Quantitative Audit System for Safety Management Systems based on Accident Database (사고 데이터베이스를 활용한 안전 관리 시스템의 정량적 Audit 시스템 개발)

  • Ahn, Sung Joon;Lee, Chang Jun
    • Journal of the Korean Society of Safety
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    • v.28 no.1
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    • pp.40-46
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    • 2013
  • In the chemical process industries, accidents have a high potential and large effects on catastrophic results. Therefore the safety management for accident prevention plays a crucial role to guarantee the process safety. For these reasons, many systematic methods for safety management system have been widely employed in the fields of chemical processes. PSM (Process safety management) is one of most representative methods. The audit system, which is one of PSM system components, evaluates the performance of PMS system. However, most existing safety audit systems are not systematic and these are performed based on knowledges and experiences of various specialist. Moreover, the safety audit is only performed based on each independent technical component. So, the results of safety audit are not a quantitative index but only a series of commentaries. Finally, it is very difficult to obtain the comparison with other plants or industries. In this study, the novel systematic method and index-based accident database of auditing safety management systems for quantitative assessment are proposed. First, the elements of safety audit replace technical methods to categories of accident database. The F-N curve of each category for accident database is employed to derive the index for quantitative assessment. The Accidental Factor Risk Index (AFRI) is suggested for evaluating the effect of each element in accident database and safety audit system. The safety audit can be modified according to the proposed index.

Algorithm of Line dangerous Index and Predicting Distance Relay Zone 3 acting time by using real time data (실시간 데이터를 이용한 선로 위험도 산출 알고리즘 및 거리계전기 Zone 3 동작 예측 알고리즘)

  • Kim, Jin-Hwan;Lee, Seung-Jae;Choi, Myeon-Song;Lim, Il-Hyung;Lim, Seong-Il;Kim, Sang-Tae
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.278_279
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    • 2009
  • Nowaday, many people study about Black-Out. In this paper, I introduce how to calculate the Dangerous Index against Black-Out, and prediction of Distance relay error action on Zone 3. we consider the real data by I-PIU which will be set on the system. The dangerous Index is calculated three index about Cascading. The prediction of Distance relay is considered by other facilities of power system. This two algorithm can be used on the center system, when the system is on danger, also on the normal states for security.

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A comparison of the traditional scoring system with the efficiency measuring system for evaluating the TQM activities

  • Yoo, Han-Joo;Lee, Jeong-Dong
    • Journal of Korean Society for Quality Management
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    • v.27 no.2
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    • pp.47-56
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    • 1999
  • In this paper, we analyzed two methodologies to evaluate the total quality management activities comparatively. One of them is the traditional scoring system (TSS) by analytic hierarchy process (AHP) and the other is the efficiency measuring system (EMS) by data envelop analysis (DEA). It is demonstrated that the index by TSS and the efficiency index by EMS are not correlated. Also, the efficiency index by EMS in terms of company characteristics such as the size of company and ISO certifications is different from the index by TSS. The result implies that to evaluate the quality activities by EMS is needed as a supplementary methodology.

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