• Journal of Intelligence and Information Systems
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• v.1 no.1
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• pp.111-122
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• 1995

전통적으로 스케줄링 문제를 해결하기 위해 LP(Linear Programming) 기법이 주로 적용되어 왔으나, 스케줄링 문제의 많은 자원과 지식, 제약조건의 복잡한 상관 관계를 LPrl법으로 표현하고 처리하기가 쉽지 않다. 따라서 최근에는 AI 기법을 스케줄링 문제에 많이 적용하고 있고, AI 기법은 지식 표현 및 휴리스틱을 다루기에 효과적이므로 문제를 모델링하고 해결하는데 용이하다 할 수 있다. 본 논문에서는 AI 기법을 기반으로 하여 스케줄링에 적합한 휴리스틱 및, 탐색기법, 지식표현 방법등을 연구하고, 이를 바탕으로 코스 스케줄링 시스템을 구현하였다. 먼저 시스템은 전체적으로 메타프로그래밍을 통하여 초기 스케줄링(initial scheduling)과 동적스케줄링 (reactive scheduling)을 수행하도록 하였다. 메타프로그램이 초기 스케줄링을 수행할때에는 휴리스틱과 자체적인 도메인 여과기법을 적용하여 탐색 공간의 불일치 요소(inconsistency)를 제거시킴으로써 백트랙킹의 발생을 최소화시켰다. 또한 초기 스케줄링의 결과를 가지고 메타프로그래밍이 동적 재스케줄링을 수행할때에는 제약조건을 통한 휴리스틱을 이용하여 초기해에 대한 조정을 최소화할 수 있는 메카니즘을 제시하였다. 이에 대한 적용 결과는 실험을 통하여 기존의 논리 언어가 제공하는 탐색 알고리즘과 비교하고 분석하였다.

• The Transactions of the Korea Information Processing Society
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• v.2 no.6
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• pp.891-902
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• 1995

To integrate both the OSI network and the TCP/IP internet, the application gateway that have the powerful and flexible paradigms has been used, but due to the micro-managements of the gateway produce the high costs and the long delay of communication in the case of emergency. The mechanism that maps the access control policies between two domains using the different security policies is needed. These problems are caused by integrating both domains with the different standards. In this paper, the application gateway that delegating to an agent the powerful and flexible services of the CMIP as well as the management functions were proposed. A proposed algorithm that delegates he management script to an gateway safely by capitalizing on the Diffie-Hellman's distribution method, and presents the security mechanism mediating the security policies for guaranteeing the secure communication between two domains using the different security policies.

• Archives of design research
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• v.19 no.6 s.68
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• pp.5-8
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• 2006

Inversion therapy has been used to relieve backpain, decrease pressure on the discs between vertebrae and stretch musdes as early as 400 BC. Gravity Guidance Inversion Table was introduced in 1960's and has been commercialized mostly for relieving backpain. in United States. But this machine needs to adjusted and possible sudden movement can cause severe injury to the users. In the 1990's, motor assisted inversion cram was introduced in Germany. But this inversion cram is too heavy and inconvenient to be used at home. In these days, the inversion machine become popular equipment in fitness clubs and health care places for relieving backpain as well as stretching muscles. And there is a growing need for home use version of motorized inversion machine. In this study, the motorized inversion machine was developed to be used for stretching exercise at home. The design became compact, simple and foldable as the results of adapting the wabble mechanism. And the machines are optimally designed by analyzing the torques applied to the machine by diverse physical size of users.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.5
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• pp.941-950
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• 2001

In this paper, we present the integrated network architecture for supporting mobile IP in third generation mobile communication networks, and propose the end-to-end QoS control mechanisms of DiffServ and QoS control functions of each network element in the proposed network. First, the QoS supporting schemes of IMT-2000 are described. Second, the necessities of integrating the networks are discussed and the integrated architecture are proposed. Third, the mapping between wireless channels and DiffServ classes are presented. Finally, the end-to-end QoS control mechanisms are proposed. We also analyze the link level protocols with QoS provisioning for mobile multimedia assuming that the system support voice and data traffic simultaneously. In case of data traffic, the delay and throughput of SREJ ARQ and Type-1 Hybrid ARQ scheme are compared, and In case of voice traffic, the packet loss rate of BCH coding is analyzed according to the varying data traffic loads. The results indicate that the adaptive link level protocols are efficient to meet the QoS requirements while the complexities are increased.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.23 no.3
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• pp.99-106
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• 2023

In this paper, we propose subregion-based area of interest management techniques for MMORPG(massively multiplayer online role playing games) integrating P2P(peer-to-peer) networking and cloud computing. For the crowded region, the proposed techniques partition it into several subregions and assign a player to manage each subregion as a coordinator. These techniques include a load balancing mechanism which regulates communication and computation overhead of such player below the specified threshold. We also provide a mechanism for satisfying the criterion, where subregions overlapped with each player's view must be switched quickly and seamlessly as the view moves around in the game world. In the proposed techniques where an efficient provisioning of resources is realized, they relieve a lot of computational power and network traffic, the load on the servers in the cloud by exploiting the capacity of the players effectively. Simulation results show that the MMORPG based on cloud and P2P architecture can reduce the considerable bandwidth at the server compared to the client server architecture as the available resources grow with the number of players in crowding or hotspots.

• Journal of Arbitration Studies
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• v.24 no.2
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• pp.33-52
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• 2014

Although climate change is a global scale question, some concerns have been raised that principles of investment arbitration may not adequately address the domestic implementation of climate change measures. A recent ICSID investment arbitration of Vattenfall v. Germany with regard to the investor's alleged damages from the phase-out of nuclear plants is a salient climate change case. The 2005 Kyoto Protocol was made to reduce greenhouse gas emissions and it provides a number of flexible mechanisms such as Joint Implementation (JI) and Clean Development Mechanism (CDM). Implementation of the Kyoto Protocol allows dispute settlement through investor-state arbitration. Any initiation of stricter emission standards can violate the prohibition on expropriations in investment agreements, regardless of the measures created to reduce greenhouse gas emissions. The effect-based expropriation doctrine can charge changes to existing emission standards as interference with the use of property that goes against the legitimate expectation of a foreign investor. In regulatory chill, threat of investor claims against the host state may preclude the strengthening of climate change measures. Stabilization clauses also have a freezing effect on the hosting state's regulation and a new law applicable to the investment. In the fair and equitable standard, basic expectations of investors when entering into earlier carbon-intensive operations can be affected by a regulation seeking to change into a low-carbon approach. As seen in the Methanex tribunal, a non-discriminatory and public purpose of environmental protection measures should be considered as non-expropriation in the arbitral tribunal unless its decision would intentionally impede a foreign investor's investment.

• The Transactions of the Korea Information Processing Society
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• v.5 no.11
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• pp.3010-3023
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• 1998

GA has a fast convergence speed in searching the one point around optimal value. But it's convergence time increase in searching the region around optimal value because it has no regional searching mechanism. BP has the tendency to converge the local minimum because it has global searching mechanism. To overcome these problems, a method in which a genetic algorithm and a back propagation are applied in turn is proposed in this paper. By using a genetic algorithm, we compute optimal synaptic strength and offset value. And then, these values are fed to the input of the back propagation. This proposed method is superior to each above method in improving the convergence speed.

• Journal of Institute of Control, Robotics and Systems
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• v.7 no.9
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• pp.733-740
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• 2001

A monitoring robot capable of doing network and RF communication is introduced. The robot has several features that poses arbitrary position thanks to a mechanism combining the 4wheel drive and 4 link mechanism, transmits an image and command data via RF wireless communication. Moreover, the image data from the camera are transferred through a network communication. The robot plays a role in monitoring what is happening around the robot, and covers wide range due to a moving camera associated with the 4 arms. The robot can adjust its mass center by the 4 link mechanism, hence it guarantees a stability in moving on the slope.

• Proceedings of the Korean Information Science Society Conference
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• 2006.06a
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• pp.211-213
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• 2006

실시간으로 변화하는 컴퓨터 통신 환경에서 멀티미디어 응용 프로그램은 QoS를 만족하기 위해 안정적으로 튜닝 되고 재구성되는 것이 필요하다. 그러나 안정적으로 QoS를 보장하는 것은 응용 프로그램의 자원 예약이나 실시간 보장과 같은 메카니즘을 제공하지 않은 일반적인 목적의 시스템 상에서 수행될 때 많은 어려움을 가지게 된다. 특히, 예측 불가능한 개방형 환경에서 최우선 자원 할당에 의해 발생되는 자원의 유효성에 대응하기 위해 QoS 적응은 수행되어야 한다. 그러나 적응을 언제, 어떻게 조정해야 하고 폭 넓은 범위에서 응용 프로그램에 어떻게 적용시킬지를 알기 위해 일반적인 알고리즘을 제시해야할 필요가 있다. 이러한 목적을 위해, 본 논문에서는 멀티미디어 어플리케이션의 파라미터를 모델링하고, 파라미터간의 관계를 정량적으로 얻기 위해 계층적 QoS 프로빙 알고리즘을 적용한다. 이것을 기반으로 설계된 베이지안 네트워크를 이용하여 불확실한 정보를 확률값으로 처리함으로써 적응 행동을 예측하도록 한다. 마지막으로 실제 실험을 통해 제안된 미들웨어의 유용성을 확인한다.

• Journal of the Korea Computer Industry Society
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• v.3 no.2
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• pp.167-178
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• 2002

XML documents used for exchanging structured documents between heterogeneous distributed systems are spreading among B2B and the industrial world rapidly. This condition brings an object-oriented visualization tool for modeling XML documents. It is hard to apply for DTD - the rule for declaring document type, which is employed in XML, to various industrial field. Thus, W3C announced Recommendation for XML Schema - the rule for declaring new document type which is adaptable to XML and satisfy to user. Document Type which has high reusability and flexibility can be defined owing to that XML Schema is designed by utilization of Object-Oriented-Modelling technique(UML). This document is proposed the specification and an algorithm for mapping XML Schema to UML.