• Environmental Analysis Health and Toxicology
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• 제19권1호
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• pp.81-91
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• 2004

Although it is suggested that risk -based management plan is needed to manage air pollution effectively, we have no resources enough to evaluate all aspects of substances and set priorities. So we need to develop a logical and easy risk-based priority setting method. However, it if impossible that only one generic system that is consistent with all the use is developed. In this study, we proposed a human health risk based priority-setting method for hazardous air pollutants, and ranked priorities for this method. First of all, after investigating previous chemical ranking and scoring systems, we chose appropriate indicators and logics to goal of this study and made a chemical priority ranking method using these. As results, final scores in priority ranking method were derived for 25 substances, and ethylene oxide, acrylonitrile and vinyl chloride were included in high ranks. In addition, same substances were highly ranked when using default values like when using no default, but the scores of hydrofluoric acid and ryan and compounds were sensitive to default values. This study could be important that priorities were set including toxicity type and quality and local inherent exposure conditions and we can set area-specific management guidelines and survey plans as a screening tool.

• 한국멀티미디어학회논문지
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• 제5권4호
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• pp.372-385
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• 2002

본 논문에서는 실시간 멀티미디어 데이터를 위한 효율적인 버퍼 교체 기법을 제안한다. 제안하는 기법은 실시간 특성을 고려하기 위해 다단계의 우선순위 레벨을 갖는다. 각 우선순위 레벨은 처음 참조된 데이터를 위한 콜드 셋(cold set)과 재 참조된 데이터를 위한 핫 셋(hot set)으로 구분된다. 희생 데이터 선정 작업은 버퍼 할당을 요구하는 트랜잭션의 우선순위 레벨보다 낮은 레벨만을 대상으로 콜드 셋의 최하위 레벨부터 핫 셋의 최상위 레벨까지 순차적으로 수행된다. 콜드 셋의 각 레벨에서는 가장 큰 미디어부터 교체 대상으로 선정하고, 핫 셋의 각 레벨에서는 가장 긴 참조 간격을 갖는 미디어부터 선정한다. 이로 인해 한정된 버퍼 공간에 많은 수의 인기 있는 미디어를 오랫동안 유지시킬 수 있으므로 버퍼 히트 비율이 증가되고, 많은 수의 서비스 요청을 처리할 수 있게 되어 전체적인 시스템 성능은 향상된다. 제안하는 기법에 대한 성능 평가에서는 Priority-Hints 기법을 대상으로 버퍼 히트 비율 및 트랜잭션의 마감시간 초과 비율을 비교한다. 이를 통해 기존의 기법들보다 제안하는 기법의 성능이 뛰어남을 보인다.

• 한국정보시스템학회지:정보시스템연구
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• 제16권3호
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• pp.91-108
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• 2007

To decide a reasonable investment priority of public enterprises, it is required to have an efficient evaluation standard. However, without having a standard, a budget for those enterprises has been allocated. In this research, for the efficient and reasonable budget allocation, it is discussed how to decide investment priority of information and communication enterprises of the government. In order to examine possible alternatives of the investment priority of information and communication enterprises of the government, seventeen enterprises were chosen from the enterprises of Ministry of Information and Communication. Public benefit, economic benefit, technology, politics, and step-up increase of budget were set up as evaluation standards and 16 specific standards were set up as subordinates. A hierarchical decision model was designed and analyzed by using AHP.

• Journal of Information Processing Systems
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• 제13권6호
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• pp.1459-1466
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• 2017

Recently, the development of the smart home field provides a range of services to install and keep the smart home appliance in a user's residential environment pleasantly. However, the conventional system method is not convenient enough to use properly because users have to select a device and manually operate the device on their own. In this paper, we propose a system to set the priority of the devices selected by the user and proceed with the task. When a user selects a device, the system recommends an optimal device associated with the device. The system compares and sets the priority of each device, carrying out the task one by one according to the set priority. Therefore, the proposed system is expected to provide users with increased convenience and more efficient task management.

• 한국시뮬레이션학회:학술대회논문집
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• 한국시뮬레이션학회 1997년도 춘계 학술대회 발표집
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• pp.93-99
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• 1997

Most of the past studies on FMS scheduling problems may be classified into two classes, namely off-line scheduling and on-line scheduling approach. The off-line scheduling methods are used mostly for FMS planning purposes and may not be useful real time control of FMSs, because it generates solutions only after a relatively long period of time. The on-line scheduling methods are used extensively for dynamic real-time control of FMSs although the performance of on-line scheduling algorithms tends vary dramatically depending on various configurations of FMS. Current study is about finding a better on-line scheduling rules for FMS operations. In this study, we propose a method to create priority functions that can be used in setting relative priorities among jobs or machines in on-line scheduling. The priority functions reflect the configuration of FMS and the user-defined objective functions. The priority functions are generated from diverse dispatching rules which may be considered a special priority functions by themselves, and used to determine the order of processing and transporting parts. Overall system of our work consists of two modules, the Priority Function Evolution Module (PFEM) and the FMS Simulation Module (FMSSM). The PFEM generates new priority functions using input variables from a terminal set and primitive functions from a function set by genetic programming. And the FMSSM evaluates each priority function by a simulation methodology. Based on these evaluated values, the PFEM creates new priority functions by using crossover, mutation operation and probabilistic selection. These processes are iteratively applied until the termination criteria are satisfied. We considered various configurations and objective functions of FMSs in our study, and we seek a workable solution rather than an optimum or near optimum solution in scheduling FMS operations in real time. To verify the viability of our approach, experimental results of our model on real FMS are included.

• 한국농공학회논문집
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• 제51권6호
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• pp.63-68
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• 2009

Most of agricultural reservoirs in Korea have no function of flood control except 5% of reservoirs even exposed to natural disaster. In addition, there are increasing needs for the reservoir to guarantee the release of environmental flow to the downstream. Thus, the purpose of this paper is to study the priority decision method for the reservoir redevelopment satisfying both water utilization and flood control. The major scopes of this research are to set up six priority indices and to make needed GIS data for calculating each priority. There is important consideration of obtaining the data or not in deciding the indices. Although the detailed indices is expected to better reflect redevelopment priority but the subjective indices like, 'opinion' and 'landscape' are excluded. From the results, it will enables the six priority indices to really assist in decision redevelopment priority of agricultural reservoirs.

• 한국통신학회논문지
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• 제39C권5호
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• pp.447-455
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• 2014

본 논문에서는 무안경식 3차원 영상처리 기법 중 대표적인 집적 영상 기법을 고려하여 전송 에러를 극복하여 영상 품질을 향상시키는 우선순위 전송 기법을 제안한다. 집적 영상의 각 복셀을 구성하고 있는 픽셀들의 유사성에 기반하여 전송 우선순위를 다르게 설정하고 이에 따라 변조 방식을 다르게 적용한다. 즉, 복셀을 구성하는 해당 픽셀들의 분산값이 작은 경우에는 높은 우선순위를 부여하여 에러에 강인한 특성을 갖는 변조 레벨을 사용하여 전송하고, 복셀을 구성하는 해당 픽셀의 분산값이 큰 경우에는 낮은 우선순위를 부여하여 에러율은 높아지지만 빠른 전송률을 제공하는 변조 기법을 사용하여 전송한다. 우선순위의 구분 없이 동일한 변조 레벨을 사용하는 기존 방식 대비, 우선순위가 높은 중요한 영상 데이터 비트열에 에러에 강인한 변조 레벨을 적용한 제안 방식의 경우에 수신 영상의 peak to sidelobe ratio (PSR)이 개선됨을 확인할 수 있다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제10권4호
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• pp.1661-1678
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• 2016

Clustering is one of the key technologies in vehicular networks. Constructing and maintaining stable clusters is a challenging task in high mobility environments. DWCM (Distributed and Weighted Clustering based on Mobility Metrics) is proposed in this paper based on the d-hop dominating set of the network. Each vehicle is assigned a priority that describes the cluster relationship. The cluster structure is determined according to the d-hop dominating set, where the vehicles in the d-hop dominating set act as the cluster head nodes. In addition, cluster maintenance handles the cluster structure changes caused by node mobility. The rationality of the proposed algorithm is proven. Simulation results in the NS-2 and VanetMobiSim integrated environment demonstrate the performance advantages.

• 기술혁신연구
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• 제13권1호
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• pp.25-54
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• 2005

In this study, priority setting model of new promising IT industries which will be the growth engines for the Korean IT industry, was established. Based on the AHP model, priority setting of IT new promising IT industries was conducted. Firstly, the selection cases of the new promising IT industries and major priority setting methodologies including the AHP methodology, were analyzed. The AHP model was selected as the most feasible methodology for priority setting of the new IT industries, among the various priority setting methodologies. Secondly, in setting up the AHP model for prioritization of the new promising If industries, a 'goal' was established to be priority setting of the new promising IT industries, and an 'alternatives' to be 18 new promising IT industries. Then a logical and a systematic assessment criteria including 5 main criteria('Technological Innovation', 'Market Ability', 'SPin-off Effect', 'Public Benefit', 'Strategic Importance') and 14 sub-criteria, were developed for priority setting of the 18 new promising industries. Finally, with the AHP model, the substantial analysis was made to set up priority of the 18 new promising IT industries. The substantial analysis showed the following priority setting results and implications for the 18 new promising IT industries.

• 한국정보통신학회논문지
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• 제21권3호
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• pp.657-662
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• 2017

최근 스마트 홈 분야가 발전함에 따라 스마트 기기를 가정 내부에 설치하여 사용자의 주거 환경을 쾌적하게 유지할 수 있는 서비스를 제공하고 있다. 그러나 기존 시스템은 사용자가 수동으로 기기를 조작하는 방식으로 서비스를 제공하기 때문에 모든 선택과 동작이 사용자에게 부여되어 편의성이 부족한 문제점이 있었다. 이에 본 논문에서는 이러한 문제점을 해결하기 위하여 사용자가 선택한 기기들에 우선순위를 부여하여 작업을 진행하는 시스템을 제안한다. 이는 사용자가 기기를 선택하면 해당 기기와 연계되는 기기를 사용자에게 추천한다. 추천에 관한 결과 값을 선택 값과 비교하여 우선순위가 설정되고 우선순위에 따라 기기 간 관계를 맺어 작업이 진행되는 시스템이다. 이에 따라 사용자에게 편의성과 작업 관리 효율성이 증대된 서비스를 제공할 수 있을 것으로 사료된다.