• The Journal of Korean Institute of Communications and Information Sciences
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• v.37B no.11
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• pp.1041-1049
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• 2012

The transactional memory was proposed to solve the problems of the conventional lock-based synchronization methods in the shared memory multiprocessor system. Various implementation methods for putting the high performance transactional memory to practical use have been continuously studied. However, these studies focus only on the commercialization and performance enhancement of the transactional memory. Besides, there have been few studies to analyze the system overhead of the transactional memory according to the conflict management policy. Thus this paper classifies hardware transactional memory, which is one kind of transactional memories, into four types according to the conflict management policy, and then compares and analyzes their performance and system bus traffic through their modeling and simulation. In addition, the most effective conflict management policy for the hardware transactional memory is presented through these comparison and analysis.

• Proceedings of KOSOMES biannual meeting
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• 2003.11a
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• pp.7-11
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• 2003

Ship is being operated under a highly dynamic environments and many factors are related with ship's collision and those factors are interacting. So, an analysis on the ship's collision causes is very important to prepare countermeasures which will ensure the safe navigation. And the analysis confirmed that ship's collision is occurred most frequently and the cause is closely related with human factor. The main purpose of this study is to build a model of human factors in ship's collision cause using SD(System Dynamics} approach and to measure a effect which is risk control countermeasures of ship's collision. To achieve this aim, the structure analysis on the causes of ship's collision using FSM are performed, and the structure was changed by quantitative, qualitative factors and their feedback loops in casual map. This model was performed over 20 years(1993-2012) in a standard simulation model and 8 policy simulation models.

• Journal of Navigation and Port Research
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• v.27 no.5
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• pp.493-498
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• 2003

Ship is being operated under a highly dynamic environments and many factors are related with ship's collision and those factors are interacting. So, An analysis on the ship's collision muses is very important to prepare countermeasures which will ensure the safe navigation. And the analysis confirmed that ship's collision is occurred most frequently and the muse is closely related with human factor. The main purpose of this study is to build a model of human factors in ship's collision muse using SD(System Dynamics} approach and to measure a effect which is risk control countermeasures of ship's collision. To achieve this aim, the structure analysis on the muses of ship's collision using FSM are performed, and the structure was changed by quantitative, qualitative factors and their feedback loops in casual map. This model was performed over 20 years(1993-2012) in a standard simulation model and 8 policy simulation models.

• Journal of the Korea Society for Simulation
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• v.18 no.2
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• pp.1-8
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• 2009

Enterprise security management system proposed to properly manage heterogeneous security products is the security management infrastructure designed to avoid needless duplications of management tasks and inter-operate those security products effectively. In this paper, we defined the security policies using Z-Notation and the detection algorithm of policy conflict for managing heterogeneous firewall systems. It is designed to help security management build invulnerable security policies that can unify various existing management infrastructures of security policies. Its goal is not only to improve security strength and increase the management efficiency and convenience but also to make it possible to include different security management infrastructures while building security policies. With the process of the detection and resolution for policy conflict, it is possible to integrate heterogeneous security policies and guarantee the integrity of them by avoiding conflicts or duplications among security policies. And further, it provides convenience to manage many security products existing in large networks.

• Journal of Korean Society of Transportation
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• v.23 no.3 s.81
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• pp.49-57
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• 2005

This study developed a methodology for estimating the fatality reduction by introducing technical regulation on pedestrian protection in pedestrian-vehicle collisions. Modeling a probabilistic pedestrian fatality model with logistic regression approach was one of keen interests, which employed in estimating the fatality reduction. Collision speed obtained from the accident reconstruction was used in the model development. The effects of fatality reduction, in case various Head Injury Criterion (HIC) and collision speeds are applied for the regulation. were presented as the major outcome of this study. It is expected that the outcome of this study would be an invaluable tool to assist in developing various technologies and policies for pedestrian protection.

• Proceedings of the Korea Multimedia Society Conference
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• 1998.10a
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• pp.100-105
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• 1998

기존의 병행제어 알고리즘들은 특정 종류의 응용에서만 우수한 성능을 보여왔다. 그러나, 실시간 데이터베이스 응용에서는 여러 종류, 비 실시간, 소프트 종료시한, 펌 종료시한, 하드 종료시한 트랜잭션들이 혼합된 시스템이 대부분이다. 따라서, 여기에 합당한 병행제어 알고리즘이 필요하다. 대체 버전 병행제어 기법은 2단계 로킹-높은 우선순위(2PL-HP)의 문제점인 낭비적 재시작과 낭비적 수행 문제를 해결하기 위해 제안되었다. 이 방식은 충돌이 자주 발생하는 응용 즉, 부하가 많은 응용에서는 불필요한 트랜잭션의 블록킹이 많이 발생하고, 중료시한을 만족하기 힘들었다. 이는 트랜잭션 충돌시 재시작 버전 트랜잭션의 생성 수를 제한하지 않고 충돌이 발생할 때 마다 충돌 해결 정책을 사용하였기 때문이다. 본 논문은 실시간 데이터베이스 시스템이 단위 시간에 처리할 수 있는 최대 트랜잭션의 수를 고려하여 낭비적 재시작 트랜잭션의 수를 재현하기 때문에 충돌 연산과 관련이 없는 트랜잭션의 수가 자원을 낭비하는 것을 방지하여 자원 활용면에서도 효율이 증가한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.11a
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• pp.11-14
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• 2006

의견이나 이해가 서로 맞지 않는 경우 충돌은 발생한다. 유비쿼터스 컴퓨팅 환경에서 서비스를 수행하는 과정에서 발생하는 충돌의 경우 역시, 그 서비스의 요청 및 수행과정에서 발생하는 의견이해의 차이에서 비롯된다. 서비스의 수행을 결심하기 이전에 그 서비스에 연관된 의견이나 이해관계를 파악하고 그들 사이의 이견을 방지한다면, 서비스 사이에서 발생 가능한 대부분의 충돌을 방지할 수 있다. 본 논문에서는 이를 위해 유비쿼터스 컴퓨팅 환경에서 자동으로 서비스를 제공하는 시스템의 입장에서 각 서비스들이 환경과 그 환경 안의 자원들 사이의 관계에 대한 의미를 정의하고 결정함으로써, 다수의 서비스를 충돌 없이 수행할 수 있는 방법을 제안한다.

• The KIPS Transactions:PartD
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• v.9D no.6
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• pp.1063-1070
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• 2002

With a remarkable growth and expansion of Internet, the security issues emerged from intrusions and attacks such as computer viruses, denial of services and hackings to destroy information have been considered as serious threats for Internet and the private networks. To protect networks from intrusions and attacks, many vendors have developed various security systems such as firewalls and intrusion detection systems. However, managing these systems individually demands too much work and high cost. Thus, integrated and autonomous security management for various security products has become more important. In this paper, we present the architecture of the WISMSF (Web-based Integrated Security Management System for Firewalls) and the merits of centralized approach for managing heterogeneous firewalls and implement the prototype of the central policy database that is a component of the WISMSF engine. The WISMSF engine supports an integrated view for policies, the integrity of polities and the easy recovery and addition of policies. And also, we define the policy conflicts of WISMSF and present the policy recovery process to support to the policies consistence.

• 한국과학기술학회:학술대회논문집
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• 2002.06a
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• pp.97-110
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• 2002

• The Korean Journal of Air & Space Law and Policy
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• v.14
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• pp.9-85
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• 2001