• Proceedings of the Korean Nuclear Society Conference
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• 1998.10a
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• pp.79-79
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• 1998

• The KIPS Transactions:PartC
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• v.8C no.6
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• pp.793-805
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• 2001

In the recent priority system, high-priority packet will be served first and low-priority packet will be served when there isn\`t any high-priority packet in the system. By the way, even high-priority packet can be blocked by HOL (Head of Line) contention in the input queueing System. Therefore, the whole switching performance can be improved by serving low-priority packet even though high-priority packet is blocked. In this paper, we study the performance of preemptive priority in an input queueing switch for high speed switch system. The analysis of this switching system is taken into account of the influence of priority scheduling and the window scheme for head-of-line contention. We derive queue length distribution, delay and maximum throughput for the switching system based on these control schemes. Because of the service dependencies between inputs, an exact analysis of this switching system is intractable. Consequently, we provide an approximate analysis based on some independence assumption and the flow conservation rule. We use an equivalent queueing system to estimate the service capability seen by each input. In case of the preemptive priority policy without considering a window scheme, we extend the approximation technique used by Chen and Guerin [1] to obtain more accurate results. Moreover, we also propose newly a window scheme that is appropriate for the preemptive priority switching system in view of implementation and operation. It can improve the total system throughput and delay performance of low priority packets. We also analyze this window scheme using an equivalent queueing system and compare the performance results with that without the window scheme. Numerical results are compared with simulations.

• The Journal of the Korea institute of electronic communication sciences
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• v.5 no.6
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• pp.555-562
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• 2010

Currently digital TRS is providing the voice-oriented service based on stat-tree topology of 2.5G. As result of that, it has alimitation to accept the wide band multimedia services. Therefore, this paper designed the mesh topology based on packet networkand proposed the algorism of dynamic path establishment based on priority. In korea case, we confirmed that hop numbers priority base is more reasonable than distance priority base. And counted the trunk traffic including redundancy traffic to prevent the bottlenect situation and trouble. Also analysed the bandwidth between network management centers of backbone and access.

• The Journal of Society for e-Business Studies
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• v.8 no.2
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• pp.23-31
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• 2003

Link-based search engines generate the rank using linked information of related web-documents . HITS(Hypertext Internet Topic Search), representative ranking evaluation algorithm using a special feature of web-documents based on such link, evaluates the importance degree of related pages from linked information and presents by ranking information. Problem of such HITS algorithm only is considered the link frequency within documents and depends on the set of web documents as input value. In this paper, we design the search agent based on better HITS algorithm according to advanced suitability between query and search-result in the set of given documents from link-based web search engine. It then complements locality of advanced search performance and result.

• Land and Housing Review
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• v.5 no.4
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• pp.271-279
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• 2014

Most CPTED have currently applied to newly developing apartment complexes. but developed apartment complexes are relatively vulnerable to crime due to lack of CPTED considerations. This study has examined both crime prevention preferences space and facilities considering the cost of CPTED. This study suggests plans of the CPTED application to the developed apartment complex without changing existing physical environment. The entrance of apartment complexes, underground parking lots, parks and rest areas, elevators, stairs and aisle in side of the buildings should be given top priority. The next are pedestrians roads, fences, main entrance on the first floor. Lastly, shopping store facilities and the ground parking lots are among the last ones.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.95-97
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• 1998

본 논문에서는 멀티미디어 프로세서의 특성을 반영한 프로세서 스케줄러를 설계하고 실제 구현을 통해 성능을 분석하였다. 제안한 프로세서 스케줄링 기법은 주기가 짧은 프로세서에 높은 우선순위를 부여하지만 우선 순위를 결정하기 위한 주기를 이전 작업의 주기에 위해 동적으로 계산하고 프로세서의 수행 중의 중단을 제한함으로써 Rate Monotonic 알고리즘을 동적이고 비중단적으로 수정하였다. 제안한 스케줄링 기법은 BSD를 기초로 한 운영체제인 FreeBSD 상에서 구현하여 스케줄링의 성능을 평가하였다. 제안한 스케줄러에 대한 실험에서 FreeBSD 스케줄러에 비해 멀티미디어의 실시간적인 특성을 만족하면서 수행 중의 동적인 상황 변화에 적응된 결과를 보인다.

• Proceedings of the Korea Multimedia Society Conference
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• 2002.11b
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• pp.39-42
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• 2002

인터넷의 빠른 성장과 함께 그 속에 존재하는 많은 정보들을 이용하고자 하는 인터넷 이용자들의 욕구를 충족시키기 위해 정보검색 기술이 발달하였고, 그 결과 현재 수많은 검색엔진들이 개발되어 사용되고 있다. 본 논문에서는 검색엔진을 이용한 검색의 경우 페이지 순위 결정시 사용자들에 의해 많이 읽혀진 페이지가 높은 순위에 랭크될 수 있도록 하여 좀 더 빠르고 정확한 결과를 찾을 수 있도록 하는 사용자 뷰 기반 페이지 랭킹 알고리즘을 제안한다.

• Proceedings of the Korean Operations and Management Science Society Conference
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• 2000.04a
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• pp.550-553
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• 2000

생산시스템에 대한 연구는 주로 hybrid 생산 시스템 효율성의 우위를 비교적 단순한 생산환경에서 부각시키는데 초점이 맞추어져 왔다. 본 연구에서는 실제 생산 환경에 근접한 모형을 세우고 MRP생산 시스템과 JIT 생산 시스템을 통합하는데 있어서 고려할 요소로서 기존의 MRP에 의한 간반의 자동 생성 이외의 다기능 작업자와 간반의 우선순위의 추가 요소를 고려하였다. 본 실험에서는 유휴한 상태의 다기능 작업자를 이를 필요로 하는 work centers로 배치하는 법칙을 도출하였고 간반의 우선순위를 부여함으로써 보다 재고 수준을 줄여 제품의 흐름생산에 가깝도록 하였다. 위 실험은 카메라 제조업체를 대상으로 모의실험은 Arena를 이용하였다.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.38 no.4
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• pp.59-71
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• 2001

The Current CORBA shows some limitations for its successful deployment in real time system applications. Recently, OMG adopted Real-Time CORBA specification, which is defined as an extension to CORBA. The goal of the Real-Time CORBA is to provide a standard for CORBA ORB implementations that support 'end to end predictability'. In order to support 'end-to-end predictability', Real Time CORBA specifies many components such as priority model, communication protocol configuration, thread management, and etc. Among them, 'priority model' is the most important mechanism for avoiding or bounding priority inversion in CORBA invocations. In this paper, we present our efforts on a design ,and implementation of the Priority Model in Real-Time CORBA specification. The implementation is done as an extension of omniORB2(v.3.0.0), a popular open source non real time ORB. Experiment results demonstrate that our priority model implementation shows better performance and predictability than the non real-time ORB.

• Journal of Korea Water Resources Association
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• v.56 no.12
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• pp.905-918
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• 2023

This study aimed to assess runoff reduction performance and determine installation priorities for Permeable Pavement (PP) and Rain Barrel (RB) within the Mokgam Stream basin. Optimal design parameters were determined to maximize the effectiveness of PP and RB in reducing runoff. Furthermore, the optimal parameters were incorporated to compare the runoff reduction performance of PP and RB. Analysis of the runoff curve at the basin outlet indicated that PP demonstrated superior performance in reducing runoff during the rising limb of the curve. At the same time, RB excelled within the falling limb. Comparisons of total runoff and peak runoff reduction by sub-catchment revealed that in larger sub-catchment areas, PP outperformed RB in runoff reduction. In contrast, RB exhibited higher performance in areas with a higher impervious ratio. Based on the evaluation of runoff reduction performance for PP and RB, installation priorities were determined within the Mokgam Stream basin. The results showed that PP and RB installations were prioritized for sub-catchments with larger areas and a higher impervious ratio. Furthermore, the correlation between the ranking of runoff reduction performance and sub-catchment characteristics showed a high correlation with both the impervious area ratio and sub-catchment geometrical properties in sub-watersheds exhibiting the top 25% runoff reduction performance. These results emphasize that when determining the priority for installing LID facilities in developed urban areas, it is necessary to consider not only the impervious area ratio but also the geometrical properties of the sub-catchment.