• Journal of Korean Society of Transportation
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• v.5 no.1
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• pp.47-58
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• 1987

A commodity distribution problem with intertemporal storage facilities and dynamic transportation networks is proposed. mathematical integer programming methods and multiobjective programming techniques are used in the model formulation. Dynamic characteristics of commodity distribution problems are taken into account in the model formulation. storage facility location problems and transportation link addition problems are incorporated into the intertemporal multicommodity distribution problem. The model is capable of generating the most efficient and rational commodity distribution system. Therefore it can be utilized to provided the most effective investment plan for the transportation infrastructure development as well as to evaluate the existing commodity distribution system. The model determines simultaneously the most efficient locations, sizes, and activity levels of storage facilities as well as new highway links. It is extended to multiobjective planning situations for the purpose of generating alternative investment plans in accordance to planning situations. sine the investment in transportation network improvement yields w\several external benefits for a regional economy, the induced benefit maximization objective is incorporated into the cost minimization objective. The multiobjective model generates explicitly the trade-off between cost savings and induced benefits of the investment in transportation network improvement.

• 한국HCI학회:학술대회논문집
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• 2006.02b
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• pp.240-245
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• 2006

시스템의 복잡도가 증가하고 컨버젼스 제품들이 늘어나면서 기존의 사용자 인터페이스 설계 방법론으로 미래의 사용자 환경을 예측하기엔 한계를 보인다. 또한, 제품 개발 시 관련 부서간 협업의 비중이 늘어난 반면 커뮤니케이션을 통해 얻을 수 있는 효과가 감소하고 있는 실정이다. 본 연구에서는 사용자 경험 설계 방법론으로써 PACT 분석을 응용한 시나리오 기반 디자인(Scenario-Based Design)을 채택하여 디지털 가전제품간의 네트워크 사용 환경에 대한 개념 디자인 방향을 효율적으로 제시하였다. PACT 분석은 People, Activity, Context, Technology 등 4 가지 요소를 시나리오 전개의 중요한 인자로 삼고 있는 방법론으로써 미래 사용 환경에 대한 예측과 체계적인 접근을 가능하게 했다. 또한, 다양한 전공자들로 구성된 관련 부서간의 커뮤니케이션 도구로 활용되어 각 분야의 전문성을 결과물에 반영하기에 효율적이었다. 추후 연구과제로는 본 방법론을 체계화하여 복잡하고 예측하기 어려운 도메인을 위한 사용자 중심의 설계 프로세스를 구성할 예정이다.

• BMB Reports
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• v.34 no.4
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• pp.305-309
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• 2001

MatR in Rhizobium trifolii is a malonate-responsive transcription factor that regulates the expression of genes, matABC, enabling decarboxylation of malonyl-CoA into acetyl-CoA, synthesis of malonyl-CoA from malonate and CoA, and malonate transport. According to an analysis of the amino acid sequence homology, MatR belongs to the GntR family The proteins of this family have two-domain folds, the N-terminal helix-turn-helix DNA-binding domain and the C-terminal ligand-binding domain. In order to End the malonate binding site and amino acid residues that interact with RNA polymerase, a site-directed mutagenesis was performed. Analysis of the mutant MatR suggests that Arg-160 might be involved in malonate binding, whereas Arg-102 and Arg-174 are critical for the repression activity by interacting with RNA polymerase.

• Agribusiness and Information Management
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• v.3 no.1
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• pp.1-10
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• 2011

In this exploratory analysis, we investigate the genesis and the evolution of local food-purchasing networks created and operated by consumers. In details, we describe how collecting and sharing information about food-products can become a central activity for some consumers' communities and how these communities are starting to play an active role in the food supply chain. We define this community-based food-purchasing model as collaborative food network (CFN), and we analytically describe its characteristics and differences with respect to the traditional and industrialized agrifood supply chain models. A collaborative food network community in Italy, known as GAS ("Gruppi di Acquisto Solidale" - "Solidarity Purchasing Groups"), is introduced as an example of our analytical model. We will use this empirical example to present the strengths and weaknesses of the CFN model.

• International Journal of Internet, Broadcasting and Communication
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• v.6 no.1
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• pp.5-8
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• 2014

Social networking services that connect a person to other people are attracting our attention and various types of on-the-network services are provided. Library has been playing a role of social media by providing with materials such as books and magazines, and with a place for reading, studying, getting lectures, etc. In this paper, we present a method for finding candidates of groups of the library's patrons who share interest areas by utilizing the loan records, which are obtainable by every library. Such a homogeneous group can become a candidate for a study group, a community for exchange ideas, and other activity group. We apply the method to a collection of loan records of a university library, find some problem to be solved, and propose measures for more detailed solutions. Even though the potential group finding problem still remains a lot of problems to be solved, its potential importance is very high and thus to be studies even more for future applications.

• Journal of Korea Game Society
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• v.11 no.6
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• pp.53-60
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• 2011

Since the importance of software reliability for game service increases continuously, the reliability evaluation becomes very important. This research performed an experiment which was intended to analyze the effect of software verification and validation, a representative activity of the software development process, on the software reliability. The results from the experiments provided the reliability evaluation based on the development process (e.g., Bayesian Belief Network based reliability estimation) with very useful bases.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1752-1755
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• 2002

The world wide web (WWW) already accounts f3r more Internee network traffic than any other application, including il and simple file transfer. It is also a collaborative technology in a weak sense of the word - it allows people to share information. Synchronous collaboration is where an interactive activity is simultaneous and in teal-time. Computer based real time collaborative systems like shared whiteboards. collaborative editor etc. are only beginning to emerge recently. These applications invoking more than two users exchanging information, require Multicast communication. Multicast communication is a transmission mode that is now supported by a variety of local and wide area networks. Multicasting enables multiparty communication across a wide area to sparsely distributed groups by minimizing the network load. Multicasting itself is one of the key technologies in the nut generation of the Internet This paper describes the technical issues from the aspect of multicast communication and its reliability in synchronous collaborative application.

• Annual Conference of KIPS
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• 2003.05c
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• pp.1941-1944
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• 2003

인터넷이 생활의 한 부분이 되면서 인터넷 사용자가 급증함에 따라 각종 사이버 범죄의 발생 건수 역시 크게 증가하고 있다 이러한 각종 사이버 범죄에 대응함에 있어서 가장 심각한 문제 중의 하나는 해커가 어떤 기술을 이용하여, 어떠한 방식으로 해킹을 진행하는지에 대한 정보가 매우 부족하다는 것이다. 현재 해커들은 해킹에 성공하기 위해 고도의 해킹 기법과 새로운 취약점을 이용하고 있는 반면, 해킹 방지를 위해 사용되고 있는 보안 강화 시스템들은 새로운 방식을 이용하는 해킹 시도를 효율적으로 방어하지 못하고 있는 것이 현실이다. 이와 같은 문제점을 해결하기 위해 제안된 것이 해커의 행동 양식에 대한 정보를 얻기 위한 침입유도 시스템(Honeypot)이다. 그러나 기존의 침입유도 시스템은 해커의 행동 양식 파악에 전문적인 기술이 필요하여 실시간 정보분석이 용이하지 못했다. 이에 본 논문에서는 해커의 행동양식을 실시간으로 파악하고 분석하는 허니넷(Honeynet) 형태의 침입자 행동양식 파악 시스템(Honeypot)을 설계하고 개발하였다.

• Proceedings of the KIEE Conference
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• 2003.07a
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• pp.569-571
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• 2003

As a definition of NERC, Available Transfer Capability(ATC) is a measure of the transfer capability remaining in the physical transmission network for the future commercial activity. To calculate ATC, accurate and defensible TTC, CBM and TRM should be calculated in advance. In this paper, we propose a method to quantify TRM using probabilistic load flow based on the method of moment. Generation output, bus voltages, loads, and line outages are considered as complex random variables (CRV) to take into account for uncertainties related to the transmission network conditions. Probability Density Function (PDF) of line flow at the most limiting line is used to quantify TRM with the desired probabilistic margin. Suggested method is compared with the results from conventional CPF method and verified using 24 bus MRTS, and the suggested method based on PLF shows efficiency and flexibility for the quantification of TRM compared with the conventional method.

• Electronics and Telecommunications Trends
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• v.11 no.4 s.42
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• pp.63-75
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• 1996

본 고에서는 일반 가정 및 소규모 업무용 가입자들에 대한 광대역화의 가장 경제적인 대안으로 관심을 끌고 있는 Hybrid fiber-coax 구조의 CATV 전송망에 대한 표준화 동향에 대해 조사 분석한 내용을 기술한다. HFC 액세스망에 대한 표준화는 IEEE 802.14 그룹, DAVIC, ATM Forum, IETF(Internet Engineering Task Force)와 Cable TV업계 등 여러기구에서 추진하고 있다. 지금까지 물리계층, MAC계층 등에 대한 주요 표준규격에 대해 DAVIC과 IEEE 802.14에서 주도하고 있으나, 앞으로는 데이터 서비스에 상대적 우선 순위를 두고 표준화를 추진하는 IEEE 802.14그룹에서 주도하게 될 것으로 보인다. 또한 인터넷 접속과 고속 데이터 서비스를 위한 인터페이스와 IP 접속 프로토콜에 대한 표준화를 발 빠르게 추진하고 있는 IETF와 MCNS(Multimedia Cable Network System) 등의 역할이 커질 것으로 전망된다.