• Title/Summary/Keyword: The Priority

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An Evaluation of Priority for the Green Energy Technologies Business (그린에너지기술 사업화를 위한 우선순위 평가)

  • Lee, Deokki;Hong, Jong-Chul;Park, Soo-Uk;Baik, Keum Hee
    • 한국신재생에너지학회:학술대회논문집
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    • 2011.05a
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    • pp.135.2-135.2
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    • 2011
  • The goal of this study is the derivation of priority for business in the areas of green energy technologies. In this paper, we calculated the importance weights of impact factors using the AHP (Analytic Hierarchy Process) method in order to derivation of priority to the green energy technologies business. AHP is a useful method for evaluating multi-criteria decision making problems. To apply the AHP method, specialists for the assessment have been identified by using the concept of 'plan, do, see' and the decision-making hierarchy was established. We selected 5 criteria and 16 sub-criteria for impact factors by brainstorming. According to the result in this study, the most important impact factor is the possibility of commercialization, the second is the possibility of developing the fundamental technology, and the third is the possibility of convergence technology.

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Bandwidth Tracing Arbitration Algorithm for Mixed-Clock Systems with Dynamic Priority Adaptation

  • Kwon, Young-Su;Kyung, Chong-Min
    • Proceedings of the IEEK Conference
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    • 2003.07b
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    • pp.959-962
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    • 2003
  • At the processing capabilities and operating frequency of embedded system are growing, so is the needed data bandwidth to fully utilize the processing capability. The ability to transfer huge amount of data between the embedded core and external devices is required for efficient system operation. In this paper, the data communication architecture for the mixed-clock system is proposed. The dynamic priority adaptation algorithm for bus arbitration is proposed for bandwidth guarantee. The communication architecture that incorporates the proposed arbitration algorithm adapts the priority of communication components dynamically based on the information from FIFO. The experiments show that the measured bandwidth of each component traces the required bandwidth well compared to the other arbitration algorithms

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Deciding the Maintenance Priority of Power Distribution System using Time-varying Failure Rate (시변 고장률을 이용한 배전계통 유지보수 우선순위 결정)

  • Lee, Hee-Tae;Moon, Jong-Fil;Kim, Jae-Chul
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.55 no.11
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    • pp.476-484
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    • 2006
  • The failure prediction and preventive maintenance for the equipment of nuclear power plant area using reliability-centered maintenance have been grown. On the other hand, the maintenance for power distribution system consists of time-based maintenance mainly. In this paper, the new maintenance algorithms for power distribution system are developed considering reliability indices. First of all, Time-varying failure rates are extracted from data accumulated at KEPCO using exponential distribution function and weibull distribution function. Next, based on the extracted failure rate, reliability for real power distribution system is evaluated for applying the effective maintenance algorithm which is the analytic method deciding the maintenance point of time and searching the feeder affecting the specific customer. Also the algorithm deciding the maintenance priority order are presented based on sensitivity analysis and equipment investment plan are analyzed through the presented algorithm at real power distribution system.

An Evolutionary Algorithm for Goal Programming: Application to two-sided Assembly Line Balancing Problems (목표계획법을 위한 진화알고리즘: 양면조립라인 밸런싱 문제에 적용)

  • Song, Won-Seop;Kim, Yeo-Geun
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2008.10a
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    • pp.191-196
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    • 2008
  • This paper presents an evolutionary algorithm for goal programming with preemptive priority. To do this, an evolutionary strategy is suggested which search for the solution satisfying the goals in the order of the priority. Two-sided assembly line balancing problems with multiple goals are used to validate the applicability of the algorithm. In the problems, three goals are considered in the following priority order: minimizing the number of mated-stations, achieving the goal level of workload smoothness, and maximizing the work relatedness. The proper evolutionary components such as encoding and decoding method, evaluation scheme, and genetic operators, which are specific to the problem being solved, are designed in order to improve the algorithm's performance. The computational result is reported.

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Damage Risk Based Approach for Retrofit Prioritization of Bridges (기존 교량구조물의 내진보강을 위한 우선순위 결정방법)

  • 이상우;김상효;마호성
    • Proceedings of the Earthquake Engineering Society of Korea Conference
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    • 2003.09a
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    • pp.295-302
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    • 2003
  • A quantitative approach for the retrofit prioritization of bridges is developed based on the damage risk of seismic vulnerable components. In the developed approach, seismic damage risk is estimated in the probabilistic perspectives with an analytical bridge model, which can consider various phenomena found in the seismic behaviors of girder-type bridges and damage models of various vulnerable components. Based on the total cost due to failure of structural components, weighting factors are proposed. Finally, the ranking index and retrofit priority of bridges are estimated from the overall damage risk and weighting factors of bridges. As a result, the retrofit priority of four PSC girder bridges is evaluated by using the proposed approach. The vulnerable components in need of seismic retrofit are selected accordingly. From simulated results, the validity of the proposed approach is verified by comparison with the existing approach. In addition, the proposed approach is found to be appropriate in evaluating the priority of existing bridges.

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Dispatching rules for assembly job shops with process times relying on machine capacity (장비가용능력에 의존적인 공정시간을 가지는 조립주문생산에서의 우선순위 규칙)

  • Kim, Bong-Hyeok;Na, Dong-Gil;Gil, Guk-Ho;Kim, Dong-Won
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2005.05a
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    • pp.517-522
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    • 2005
  • This paper addresses scheduling heuristics for an assembly job-shop that includes at least an assembly process throughout its processes. The assembly job shop has certain characteristics not only considering the precedence relationship between the processes but also considering the processing progress between the parts. In addition, it probably presents a different processing time for the same product according to the order of processes and the point of workable time, due to the difference in the availability of equipments. The paper proposes several priority-based dispatching rules that consider these characteristics of the assembly job-shop, aiming to minimize the total tardiness of products in the shop floor. Computational tests showed that job due date based priority rules significantly outperform existing priority rules in terms of total tardiness.

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A Study on the Priority of Users' Requirements for the Development of Military Vehicles by Analytic Hierarchy Process (AHP 기법을 통한 군용차량 개발시 운용자 요구사항 우선순위 설정 연구)

  • Lee, Bum-Koo;Shin, Yong-Cheol;Ryou, Hwang-Bin;Cho, Yong-Kun
    • Journal of Korean Institute of Industrial Engineers
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    • v.36 no.2
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    • pp.117-124
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    • 2010
  • The military vehicles are an inevitable resource that is indispensible to successfully perform modern wars. Military vehicles used in the Korean Army are the copycats of American out-dated military vehicles, but limited to fulfill the specific requirements by the operators. Korean army are nowadays trying to launch a new developmental plan for military vehicles of new concepts by the Korean Army. This article, hence, extracts the necessary factors upon the advancement of military vehicles by the expertises with the operation of military vehicles as well as sufficient experiences about maintenance. Suggesting and setting up the priority, the result makes practical application for the decision of the development of military vehicles.

Satisfaction & Importance Level of Neighborhood Environment According to the Development Concepts of New Residential Areas in the Middle-Sized City -the case of the three residential areas in Cheongju & Cheongwon- (중도시 신규택지개발지구 특성에 따른 거주자의 생활권 내 근린환경 만족도 및 중요도 -청주.청원권 3개 신규택지개발지구를 중심으로-)

  • Lee, Sang-Un;Park, Kyoung-Ok
    • Proceeding of Spring/Autumn Annual Conference of KHA
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    • 2009.04a
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    • pp.59-63
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    • 2009
  • This study has the purpose to reveal the differences of residents' level of satisfaction & demand of neighborhood environment and recognized residents' importance level & improvement priority of neighborhood environment at new 3 residential areas in the middle-sized city. The 3 residential areas had differentiated development concepts; (1) residential area in the downtown (2) government-residence compound area in the downtown and (3) industry-residence compound area in the outskirts. Followings are the results of the study. 1) It is different that importance level which have effect on satisfaction of neighborhood environment according to the 3 residential areas. 2) In terms of improvement priority residents present higher preference on location. In terms of improvement priority is different according to the 3 residential areas.

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VLSI implementation of Usage Parameter Control Based on Cell Loss Priority (셀손실 우선순위 기반의 사용 변수제어의 VLSI 구현)

  • 권재우;조태경;최명렬
    • Proceedings of the IEEK Conference
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    • 2000.11b
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    • pp.196-199
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    • 2000
  • In this paper has studied an enhanced usage parameter control algorithm, which is one of the preventive traffic control method in ATM networks. The proposed algorithm is based on the CLP(Cell Loss Priority) bit in the ATM cell header. This algorithm can eliminate the measurement phasing problem in cell conformance testing in ATM networks. The proposed algorithm can minimize the cell loss ratio of high priority cell(CLP = 0) and resolve the burstiness of eel]s which may be generated in the multiplexing and demultiplexing procedure. For the performance evaluation, we have simulated the proposed algorithm with discrete time input traffic model and the results show that the performance of the proposed algorithm is better than that of ITU-T usage parameter control algorithm.

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Performance Analysis of Backoff Algorithm in Wireless LANs with Prioritized Messages (무선랜 환경에서 우선순위를 고려한 백오프 알고리듬 성능분석)

  • Jeong Seok-Yun;Heo Seon
    • Proceedings of the Korean Operations and Management Science Society Conference
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    • 2006.05a
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    • pp.1656-1660
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    • 2006
  • Distributed coordination function(DCF) is the primary random access mechanism of IEEE 802.11, which is the basic protocol of wireless LAN based on the CSMA/CA protocol. It enables fast installation with minimal management and maintenance costs and is a very robust protocol for the best effort service in wireless medium. The current DCF, however, is known to be unsuitable for real-time applications such as voice message transmission. In this paper, we focus on the performance issues of IEEE 802.11 which accommodate the prioritized messages. Existing results use the initial window size and backoff window-increasing factor as tools to handle the priority of the messages. Instead, we introduce a novel scheme which chooses the backoff timer with arbitrary probabilities. By this, one can greatly reduce the backoff delay of the lower priority messages without degrading the performance of higher priority.

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