• The Journal of the Korea institute of electronic communication sciences
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• v.17 no.5
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• pp.791-800
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• 2022

CCN, which has emerged to overcome the limitations of existing network structures, enables efficient networking by changing the IP Address-based network method to the Content-based network method. At this time, the contents are stored on each node(router) rather than on the top server, and considering the limitation of storage capacity, it is very important to determine which contents to store and release through the cache policy, and there are several cache policies that have been studied so far. In this paper, two of the existing cache policies, producer popularity-based and distance-based, were mixed. In addition, the mixing ratio was set differently to experiment, and we proved which experiement was the most efficient one.

• The KIPS Transactions:PartC
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• v.12C no.2 s.98
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• pp.289-300
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• 2005

This paper proposed an analytical framework to compare and model the policy-based network management; centralized and distributed typed model. Policy-based network is introduced in various application fields, and a policy framework can offer different processing performance according to application. Therefore, we evaluated the performance and extensibility of each PBNM model when we apply the policy process to the models. The evaluated measurement metrics are policy provisioning time, traffic occurrence amount, PDP processing rate, and global conflict detection in qualitative simulation. The results show that the suitable structure is required according to the analysis for the careful application characteristics, when PBNM is adopted. The modeling framework presented in this paper is intended to quantify the merits and demerits among the currently suggested PBNM models.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.59-62
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• 2002

최근 네트워크 구성이 복잡해짐에 따라 정책기반의 네트워크 관리기술에 대한 필요성이 증가하고 있으며, 특히 네트워크 보안관리를 위한 새로운 패러다임으로 정책기반의 네트워크 관리 기술이 도입되고 있다. 보안정책 서버는 새로운 정책을 입력하거나 기존의 정책을 수정, 삭제하는 기능과 보안정책 결정 요구 발생시 정책결정을 수행하여야 하는데 이를 위해서는 보안정책 실행시스템에서 보내온 경보 메시지에 대한 분석 및 관리가 필요하다. 따라서 이 논문에서는 정책기반 네트워크 보안관리 프레임워크의 구조 중에서 보안정책 서버의 효율적인 보안정책 수림 및 수행을 지원하기 위한 경보데이터 관리기를 설계하고 구현한다. 그리고 경보 데이터 저장과 분석을 위해서 데이터베이스 스키마를 설계하고 저장된 경보데이터를 분석하는 모듈을 구현한다. 또한 불량사용자나 호스트의 관리를 위하여 블랙 리스트 매니져를 구현하며 블랙리스트 매니져는 위험한 불량사용자와 호스트를 탐지하여 관리하는 기능을 제공한다 구현된 경보 관리기나 고수준 분석기는 효율적인 보안정책관리를 지원하게 된다.

• Journal of Korea Multimedia Society
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• v.7 no.5
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• pp.721-736
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• 2004

Because of increasing the notebook computer and PDA, users' requirement with respect to mobility is growing more and more. However, current IP protocol is not changed IP address and can not deliver IP packets on new location of host in case moving another network. To solve this problem, the IETF has proposed mobile IP. Today users want to be provided suitable QoS in the internet since demand of services is variety. The policy-based network management is method which can solve various problems of QoS, security, and complication of management in IP networks. This paper presents the network topology constitution, operation procedure and architecture of policy-based network management for providing internet DiffServ on mobile IP environment. In this paper we propose policy classes of policy-based DiffServ network management on mobile environment and create policy scenarios using the proposed policy description language to represent the policy classes. Finally, we implemented a policy-based DiffServ network management system on mobile IP environment.

• Proceedings of the Korean Information Science Society Conference
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• 1998.10a
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• pp.524-526
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• 1998

지금까지 방화벽 시스템에 대한 연구는 정보에 대한 접근을 최대한으로 제한하는 "기본 거부(Default Deny)"정책을 중심으로 연구되어 왔다. 그러나 대학 및 연구소와 같은 환경(이하 연구 환경)에서는 많은 연구 과제들이 동시에 수행되고, 또한 이러한 정보들이 외부와 공동으로 진행되는 경우에 정보를 공유할 뿐만 아니라 연구 결과를 외부에 공개할 필요성이 있다. 따라서 연구환경에 대한 보안정책은 기존의 기본 거부 정책보다는 정보에 대한 "개방성"이 요구된다. 따라서 본 연구에서는 연구환경에서, 정보의 공유 및 공개를 위한"개방성"을 충족시키기 위하여 역할 기반 보안정책(Role-Based Security Policy)을 이용한 방화벽 시스템을 제안한다. 역할 기반 보안 정책을 적용함으로서 방화벽 시스템 내무 사용자에 대한 보안 정책 적용이 가능할 뿐만 아니라, 방화벽 시스템 운용시에도 사용자의 역할 할당 및 변경 등의 보안 정책 변경이 가능하다. 역할 할당 및 변경 등의 보안 정책 변경이 가능하다.

• Journal of the Korea Computer Industry Society
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• v.3 no.9
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• pp.1189-1198
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• 2002

Policy base management system that can satisfy various user's request in distributed system environment recently and manage network resources efficiently is required. Described policy base management information consisted of ECA(Event-Condition-Action) rules so that efficient management of various communication network and consistent management policy may be available in this paper. Policy is consisted of Event, Condition and Actions to achieve when condition is satisfied. And we can present formality of dynamic function of management object as applying policy to ATM congestion control model been applying in real environment.

• Electronics and Telecommunications Trends
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• v.23 no.2 s.110
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• pp.1-12
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• 2008

최근 급격한 기술혁신으로 기술간 융합이 가속화되면서 융합정책이 새로운 화두로 부상하고 있다. 그러나, 최근까지의 연구결과와 정책과제들을 보면 '융합' 이라는 현상 전반에 대한 이해와 통찰에 기반한 것이 아니라 개별기술 분야에서 나타나고 있는 현상들을 종합하여 '융합정책' 이라는 이름으로 제시되고 있는 듯하여 우려된다. '융합기술' 이란 현재만이 아니라 기술의 진화와 혁신이 발생하는 곳에서는 늘 존재하였다. 단지 최근 들어 '융합' 이라는 용어가 더욱 강조되고 주목을 받는 이유는 기존에 발생하였던 '점진적 융합' 과는 달리 발생속도가 급격하고 그 영역이 대단히 광범위하게 나타나는 '혁신적.광역적 융합' 의 성격을 띄기 때문으로 판단된다. 이러한 '혁신적.광역적 융합' 의 공통점은 어느 분야에서 발생하든 IT를 기반으로 한다는 점이다. 이에 따라 IT는 융합의 실체가 IT로 나타나든 타 분야에 내재화되어 나타나든 모든 분야의 원천기술로 작용할 것이 확실시 된다. 본 고에서는 일대 전환기를 맞고 있는 IT 기반 융합의 의미와 현상을 살펴 보고, 이를 토대로 향후 국민소득 3만 달러, 4만 달러 달성을 위한 IT 기반 융합정책의 방향을 제시하고자 하였다.

• The KIPS Transactions:PartC
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• v.8C no.5
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• pp.607-614
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• 2001

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 those attacks, many vendors have developed various security systems such as firewalls, intrusion detection systems, and access control systems. However, managing those systems individually requires too much work and high cost. Thus, in order to manage integrated security management and establish consistent security management for various security products, the policy model of PN-ISMS (Policy Based Integrated Security Management System) has become very important. In this paper, present the hierarchical policy model which explore the refinement of high-level/conceptual policies into a number of more specific policies to form a policy hierarchy. A formal method of policy description was used as the basis of the mode in order to achieve precision and generality. Z-Notation was chosen for this propose. The Z-Notation is mathematical notation for expressing and communicating the specifications of computer programs. Z uses conventional notations of logic and set theory organized into expressions called schemas.

• Journal of KIISE:Software and Applications
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• v.37 no.5
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• pp.363-369
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• 2010

Demonstration-based learning has the advantage that a user can easily teach his/her robot new task knowledge just by demonstrating directly how to perform the task. However, many previous demonstration-based learning techniques used a kind of attribute-value vector model to represent their state spaces and policies. Due to the limitation of this model, they suffered from both low efficiency of the learning process and low reusability of the learned policy. In this paper, we present a new demonstration-based learning method, in which the relational model is adopted in place of the attribute-value model. Applying the relational instance-based learning to the training examples extracted from the records of the user demonstrations, the method derives a relational instance-based policy which can be easily utilized for other similar tasks in the same domain. A relational policy maps a context, represented as a pair of (state, goal), to a corresponding action to be executed. In this paper, we give a detail explanation of our demonstration-based relational policy learning method, and then analyze the effectiveness of our learning method through some experiments using a robot simulator.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.31 no.4B
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• pp.344-348
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• 2006

This paper proposes a QoS policy for cellular networks which support the policy based network management scheme. The policy exploits the existing underlying DiffServ mechanism and the priority-based packet scheduler in order to provide the packets with different handling priority depending on their belonging traffic classes. The simulation results reveals the effectiveness of the proposed policy under the network congestion; it shows that the goodput of the real-time traffic is not affected at all in spite of the surge of the non real-time traffic.