• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.1247-1250
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• 2012

기존 방법은 Cockburn의 Goal 지향 유스케이스 방법[7]을 이용하여 고객 요구사항을 추출하는 방법을 제안하였다[2]. 그런 방법은 개발자 관점 요구사항으로 사용자의 요구를 충족시키기가 어렵다. 그래서 이 논문에서는 사용자 중심의 소프트웨어 개발 방법론[1,3,4,6]을 적용하여 사용자의 니즈(Needs)에 맞는 사용자 선호도 요구사항을 찾고자 한다. 이러한 요구사항의 Goal 중요도를 측정하여 우선순위를 도출한다. 이는 사용자의 니즈에 맞는 요구사항 결정과 테스트 케이스의 우선순위화가 가능하다. 사례연구로 U-Home 안에서 실내온도 조절에 관한 사용자의 요구를 분석하였다[1].

• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.9
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• pp.1883-1890
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• 2009

Existing MAC protocol can not show good performance in WMN environment. New MAC protocols is proposed because of Mobile Point's mobility, entire distributed environment, heavy traffic problems. This thesis proposes new channel contention method fur Mesh DCF. Mesh DCF uses ACH phase in TDMA frame to perform selection and elimination. Prioritized phases's count m and Fair Elimination phases's count n is determine contention level and make string probability to only one win the contention. Contention Number group's count K to determine the contention level in Fair Elimination Phase gives Fairness but make low probability to only one win the contention. It is sure that enough size of n and K can improve entire performance as result.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.9
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• pp.2055-2062
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• 2013

Digital evidence which is the new form of evidence to crime makes little difference in value and function with existing evidences. As time goes on, digital evidence will be the important part of the collection and the admissibility of evidence. Usually a digital forensic investigator has to spend a lot of time in order to find clues related to the investigation among the huge amount of data extracted from one or more potential containers of evidence such as computer systems, storage media and devices. Therefore, these evidences need to be ranked and prioritized based on the importance of potential relevant evidence to decrease the investigate time. In this paper we propose a methodology which prioritizes order in which evidences are to be examined in order to help in selecting the right evidence for investigation. The proposed scheme is based on Fuzzy Multi-Criteria Decision Making, in which uncertain parameters such as evidence investigation duration, value of evidence and relation between evidence, and relation between the case and time are used in the decision process using the aggregation function in fuzzy set theory.

• The KIPS Transactions:PartB
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• v.15B no.5
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• pp.487-492
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• 2008

Most Web search engines use ranking methods that take both the relevancy and the importance of documents into consideration. The importance of a document denotes the degree of usefulness of the document to general users. One of the most successful methods for estimating the importance of a document has been Page-Rank algorithm which uses the hyperlink structure of the Web for the estimation. In this paper, we propose a new importance estimation algorithm for the blog environment. The proposed method, first, calculates the importance of each document using user's bookmark and click count. Then, the Guru point of a blogger is computed as the sum of all importance points of documents which he/she wrote. Finally, the guru points are reflected in document ranking again. Our experiments show that the proposed method has higher correlation coefficient than the traditional methods with respect to correct answers.

• The Journal of Society for e-Business Studies
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• v.13 no.2
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• pp.213-223
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• 2008

The efficient discovery of services from a large scale collection of services has become an important issue[7, 24]. We studied a syntactic method for Web service discovery, rather than a semantic method. We regarded a service discovery as a retrieval problem on the proprietary XML formats, which were service descriptions in a registry DB. We modeled services and queries as probabilistic values and devised similarity-based retrieval techniques. The benefits of our way are follows. First, our system supports ranked service retrieval by keyword search. Second, we considers both of UDDI data and WSDL definitions of services amid query evaluation time. Last, our technique can be easily implemented on the off-theshelf DBMS and also utilize good features of DBMS maintenance.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.4B
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• pp.153-161
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• 2005

In a multi-channel network based of wavelength division multiplexing (WDM) technology, an efficient protocol is needed in order for the transmitter and receiver to be tuned to the same wavelength during message transmission time. This paper proposes a priority-based reservation protocol that can efficiently support variable-length messages that require different QoS requirements. In this proposed protocol, high-priority nodes can reserve the data channel before low-priority nodes. However, once a node reserves a data channel successfully, it can persistently use the reserved channel till message transmission is finished regardless of the priority of the node. Moreover, the protocol can operate independently of the number of nodes, and any new node can join the network anytime without requiring network re-initialization. The protocol is analyzed with a finite population model and the throughput-delay characteristics are investigated as performance measures.

• Journal of the Korea Society for Simulation
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• v.31 no.2
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• pp.1-10
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• 2022

The packaging plastic manufacturing(blown film) industry has long developed in China, but most of them are small/medium-sized enterprises, and it is very rare to have appropriate operation plans suitable for their own business. The packaging plastic manufacturing industry(blown film) follows a typical Make-To-Order method, and the sequence of processing orders is very important. Waste of materials incurred by frequent conversions of production cannot be avoided, and generally, related costs incurred during conversion production are also different. Therefore, this study developed a job sequence determination model for improving operating profits using @RISK simulation software, compared and analyzed 3 actionable clustering treatment methods proposed by technical managers and field experts under the actual situation of the factory.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.5D
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• pp.579-585
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• 2009

In spite of the proven effectiveness of ramp metering system, it has not been successfully implemented in Korean setting. The purpose of this paper is to select target locations to introduce ramp metering into the Korean expressway system. For this, domestic standards to introduce ramp metering have been presented after reviewing those of the US. The major criteria are level of service (LOS), the existence of detour route, space for queue build-up and opened ramp. 15 different locations were selected and AHP has been used to make priority among them. Intuitively, the result of priority was in accordance with the congestion and traffic volume. The core results identified in this paper is expected to be used in different cities and expressway networks elsewhere.

• Proceedings of the Korean Information Science Society Conference
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• 2005.11a
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• pp.922-924
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• 2005

실시간 시스템의 개발 및 운영에 사용되는 실시간 운영체제는 여러 개의 태스크가 동시에 작업할 수 있는 멀티태스킹 환경과 각 태스크에 우선순위를 부여하여 가장 높은 우선순위의 태스크가 CPU 를 선점하는 스케줄링 방법, 그리고 태스크간 동기화 및 통신을 위한 메커니즘을 제공하고 있다. 또한 여러 태스크들에 의해 사용되는 공유자원을 관리하기 위해 세마포어(Semaphore)를 사용하여 태스크간 동기화를 제공한다. 그러나 하나의 태스크가 세마포어를 이용하여 공유자원에 대해 여러 번 접근 할 경우, 데드락(Deadlock)을 일으킬 소지가 많다. 본 논문에서는 실시간 운영체제인 $iRTOS^{TM}$ 에서 데드락을 방지하기 위한 재귀적 세마포어(Recursive Semaphore)를 설계 및 구현하였다.

• The Korean Journal of Financial Management
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• v.14 no.1
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• pp.75-105
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• 1997

최근 수년사이 우리나라 경제의 근간을 이루고 있는 중소기업의 부도사태가 갈수륵 확산되는 양상을 보이고 있다. 이로 인해 귀중한 경제자원이 사장되는가 하면 종업원이 실직을 당하고 부도기업과 거래해온 계열 및 하청업체들도 연쇄부도에 휩싸임으로써 연관산업은 물론 지역경제 및 국가경제에까지 큰 손실을 끼치고 있다. 따라서 어떻게 중소기업의 부도를 예방하고 그 피해를 최소화할 수 있느냐 하는 문제는 초미의 관심사로 대두됐다. 본 연구는 이같은 관점에서 중소기업부실화의 효율적인 예방대책마련에 필수적인 근거자료를 제시하는데 초점을 맞추고 있다. 이를 위해 설문조사를 실시하고 정책의 우선순위결정을 위한 통계적 모형인 AHP(analytical hierarchy process)모형을 이용해 설문조사내용을 분석한바, 부실화원인간의 계층적 구조가 파악되고 원인별 영향도가 계량화되고 있다. 이러한 연구결과는 부실화예방을 위한 정책의 우선순위결정이 가능함을 보여주는 것이다. 또 부실화연구에 새로운 접근방법을 구사한 점도 특기할만하다.