• Journal of Information Technology Services
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• v.7 no.1
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• pp.131-149
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• 2008

Bandwidth Trading(BT) represents a potential market with over 1 trillion USD across the world and high growth potential. BT is also likely to accelerate globalization of the telecommunications industry and massive restructuring driven by unbundling rush. However, systematic researches on BT remain at an infant stage. This study starts with structure analysis of the Internet industry, and discusses significance of Internet interconnection with respect to BT Issues. We also describe the bandwidth commoditization trends and review technical requirements for effective Internet interconnection with BT capability. Taking a step further, this study explores the possibility of improving efficiency of network providers and increasing user convenience by developing an architectural prototype of Hub-&-Spoke interconnection model required to facilitate BT. The BT market provides an Innovative base to ease rigidity of two-party contract and Increase service efficiency. However, as fair, efficient operation by third party is required, this research finally proposes an exchanging hub named NIBX(New Internet Business eXchange).

• Proceedings of the Korea Institute of Fire Science and Engineering Conference
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• 2010.10a
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• pp.199-202
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• 2010

우주발사체를 운용하는 발사장은 화재나 폭발의 위험에 많이 노출 되어 있다. 발사장은 비행시험전 발사체의 모든 상태를 점검 하고, 비행시험을 수행하는 곳이다. 또, 유사시에는 대량의 산화제와 연료가 누출 되어 화재 및 폭발사고로 이어질 가능성이 있는 곳이다. 나로우주센터에서 운용하는 우주발사체 나로호는 연료로 케로신(kerosene)을 사용하고, 산화제로 액화산소(LOX)를 사용한다. 발사대의 소화설비는 화재발생시 원격제어를 통해서 소화수와 소화약제를 분사하여 진화하는 방식으로 구성 되어 있다.

• Journal of the Korean Society for Railway
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• v.10 no.3 s.40
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• pp.306-312
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• 2007

This paper presents the optimal design method of the train repair facility based on the simulation analysis. The train is divided into the power car, motorized car and passenger car for the simulation process analysis and train repair facility is composed of each subsystems such as a blast, dry and wash workshop. In simulation analysis, we consider the critical (dependent) factors and design (independent) factors for the optimal design. Therefore, a simulation optimization uses Evolution Strategy (ES) in order to find the optimal design factors. Experimental results indicate that simulation design factors are sufficient to satisfy the conditions of dependent variables. The proposed analysis method demonstrates that simulation design factors determined by the simulation optimization are appropriate for real design factors in a real situation and the accuracy and confidence for the simulation results are increased.

• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2019.05a
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• pp.40-41
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• 2019

In the VTS, the predictions of vessel mobility and situation awareness of maritime environment are basic function. In recent years, pilotage information is an essential aware element of VTS personnel for vessel traffic management. So, we designed the structure of pilotage information service with VTS and tested in real environment. In the future, similar pilotage information can be used as a useful VTS service.

• Review of KIISC
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• v.29 no.5
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• pp.7-20
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• 2019

2019년 4월, 4세대 이동통신보다 최대 20배 빠른 속도, 10배 많은 IoT 기기의 연결, 10배 짧은 저지연 서비스를 제공하기 위해 5세대 이동통신이 세계최초로 상용화되었다. 5G 이동통신기술은 고속 대용량의 음성 및 데이터 통신을 제공할 뿐만 아니라 지연 속도와 신뢰성에 민감한 IoT 기기를 수용하기 위해 다양한 최신 기술을 적용하는 기술적 진보가 있었다. 그러나 5G 네트워크 및 서비스가 개방성, 확장성, 유연성을 제공하기 위해 분산 코어 네트워크 구조와 소프트웨어기반 아키텍처(SDN NFV, MEC, 클라우드 컴퓨팅 등)로의 기술적 변화는 새로운 공격 접근 경로와 네트워크 슬라이싱과 같은 논리적인 계층의 복잡한 보안 가시성 이슈 등 사이버보안관점에서 새로운 도전(Challenges)이 되고 있다. 본 논문에서는 5G 모바일 네트워크의 기술적 변화에 따른 보안도전과제와 해외 5G 보안 아키텍처 연구들을 분석하여 5G 보안 설계 및 운영 고려사항을 고찰하고자 한다.

• Annual Conference of KIPS
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• 2010.04a
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• pp.318-321
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• 2010

기존의 가상세계는 서비스 주체별로 독자적인 방식으로 구축하여 서비스를 제공하는 닫힌 가상세계에서의 참여자간의 커뮤니티 형성, 특정 서비스 영역에 중점을 두고 있다. 하지만 닫힌 가상세계 서비스는 사용자에게 매우 불편하다. 각 가상세계 서비스별로 회원가입을 하고 해당 프로그램을 설치해야 하며, 여러 개의 ID와 password를 기억해야 한다. 또한, 제작자중심으로 가상세계를 구현하기 때문에 사용자들의 생각을 표현할 수 없어 폐쇄적이다. 본 논문은 사용자 중심의 개방형 및 진화형 현실모사 가상세계 프레임워크를 제작하기 위한 설계 및 구현에 대해 기술한다.

• Journal of KIISE:Computing Practices and Letters
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• v.13 no.7
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• pp.545-549
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• 2007

The Bio-Inspired System focuses on the creation of an effective system model for massive network applications and is being widely developed. However, the system has a problem-difficulty implementing three features in the system, which includes scalability, adaptability and survivability. To solve this problem, we designed an Ecogent as a multiple intelligence agent, and a Bio-platform to address the three features of scalability, adaptability and survivability. The Bio-Inspired System Platform consists of an ERS (Ecogent Runtime Services) Platform and a Bio-Platform. The ERS platform serves the basic functions of mobile agents, such as Registration, Life Cycle, Migration, Communication, Location and Fault Tolerance. The Bio-Platform includes the functions of Evolution Control and Stigmergy Control to address evolution and adaptation.

• The Journal of the Korea institute of electronic communication sciences
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• v.9 no.2
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• pp.267-271
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• 2014

Nuclear power plant data networks and their associated safety systems are being modernized to include many information technology (IT) networks and applications. Along with the advancement of plant data networks (PDN), instrumentation and control systems are being upgraded with modern digital, microprocessor-based systems. However, nuclear PDN is confronted significant side-effects, which PDN is exposed to prevalent cyber threats typically found in IT environments. Therefore, cyber security vulnerabilities and possibilities of cyber incidents are dramatically increased in nuclear PDN. Consequently, it should be designed fully ensuring the PDN meet all reliability, performance and security requirements in order to overcome the disadvantages raised from adaption of IT technology. In this paper, we provide technical security criteria should be used in design and evaluation of secure PDN. It is believed PDN, which is designed and operated along with these technical security critera, effectively protect against possible outside cyber threats.

• Composites Research
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• v.12 no.4
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• pp.42-54
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• 1999

FMLC(Fiber-Metal Laminate Composites) is a new structural material combining thin metal laminate with adhesive fiber prepreg, it nearly include all the advantage of metallic materials, for example: good plasticity, impact resistance, processibility, light weight and excellent fatigue properties. This research studied the optimum design of the FMLC subject to various loading conditions using genetic algorithm. The finite element method based on the shear deformation theory was used for the analysis of FMLC. Tasi-Hill failure criterion and Miser yield criterion were taken as fitness functions of the fiber prepreg and the metal laminate, respectively. The design variables were fiber orientation angles. In genetic algorithm, the tournament selection and the uniform crossover method were used. The elitist model was also used to be effective evolution strategy and the creeping random search method was adopted in order to approach a solution with high accuracy. Optimization results were given for various loading conditions and compared with CFRP(Carbon Fiber Reinforced Plastic). The results show that the FMLC is more excellent than the CFRP in point and uniform loading conditions and it is more stable to unexpected loading because the deviation of failure index is smaller than that of CFRP.

• The Journal of the Korea Contents Association
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• v.10 no.8
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• pp.104-110
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• 2010

In the field of biotechnology, computer can play varied roles such as the ordinal analysis, ordianl comparison, nutation tracing, analogy comparison for drug design, estimation of protein function, cell mechanism, and verifying the role of a gene for preventing diseases. Additionally, by constructing database, it can provide an application for the cloning process in other data researches, and be used as a basis for the comparative genetics. For the most of researcher about biotechnology, they need to use the tool that can do all of job above. This study is focused on looking into problems of existing systems to analysis bio data, and designing an improved analyzing system that can propose a solution. In additional, it has been considered to improve the performance of each constituent, and all the constituents, which have been separately processed, are combind in a single system to get over old problems of the existing system.