• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1993년도 한국자동제어학술회의논문집(국내학술편); Seoul National University, Seoul; 20-22 Oct. 1993
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• pp.1000-1005
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• 1993

In this paper asymptotic formulate for performance characteristics throughput, delay) of large scale token-passing networks with priorities and limited service are given. In particular, adaptive control procedures for obtaining optimal buffer capacity with respect to each priority and optimal limited service are shown. All results obtained are supported by simulations.

• 한국통신학회논문지
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• 제30권3B호
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• pp.114-129
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• 2005

본 논문에서는 gigabit Ethernet-PON의 상향 트래픽 제어를 위해 제안 된 Interleaved Polling with Adaptive Cycle Time (IPACT) 방식을 살펴보고 IPACT의 gated service와 limited service에 관한 성능을 수학적으로 분석하였다. 성능분석 방법은 IPACT polling system으로 모델링하고, mean value analysis를 사용하였다. Arrival rate λ의 값을 크기에 따라 세 구간으로 나누곤 구간마다의 수학적 분석과정을 제시하였다. 분석결과 gated service와 limited service의 평균 패킷 지연시간, 평균 큐 사이즈, 평균 싸이클 시간 등을 구하고, 수학적 성능분석의 정확성을 검증하기 위해 시뮬레이션을 수행하여 수학적 분석결과와 시뮬레이션 결과가 상당히 일치함을 확인하였다. 기존에 IPACT의 성능평가는 시뮬레이션에만 의존하였는데, 이 방법은 시간과 노력이 많이 필요하였지만, 수학적 성능분석은 성능지표를 단시간 내에 다양하게 구할 수 있어서 시스템 설계에 널리 활용될 수 있을 것이다.

• 경영과학
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• 제26권3호
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• pp.67-78
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• 2009

In this paper, I analyze the mobile broadband services market characterized by vertical and horizontal differentiation. Vertical differentiation as service quality differentiation is based on the transmission speed of mobile internet service and horizontal differentiation as spatial differentiation is based on the service coverage. Theoretical explanations for the competitive price policy have been developed in the game context of WiBro which represent the high quality within the limited service coverage and HSDPA which represent relatively low quality with nation-wide service. When the WiBro has a mobile broadband service quality advantage and the difference in quality is sufficiently low, the price of WiBro with limited service coverage is relatively lower than that of HSDPA. This occurs because the advantage of WiBro's vertical service differentiation is offset by the disadvantage of horizontal differentiation. The difference in the quality of mobile internet service, however, is not too high, the price of WiBro is relatively higher than that of HSDPA. Moreover, when the service quality of WiBro is sufficiently high, the low quality HSDPA service faces no demand.

• 한국경영정보학회:학술대회논문집
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• 한국경영정보학회 2007년도 International Conference
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• pp.141-146
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• 2007

The importance of the net-based customer service in delivering supplementary after-sale services associated with product has been well documented. The strategic advantages of a well-implemented the net-based customer service are enhanced customer loyalty and higher lock-in of customers, and the resulting reduction in competition and the consequent increase in profits. However, not all customers utilize such the net-based customer service. This is partly due to the e-commerce divide, and partly due to privacy and security concerns of the customer for sharing personal information with firms. The limited level of customer adoption of the net-based customer service affects the firm profits and the customers' welfare. We use a game-theoretic model in which we model the net-based customer service system as a mechanism to enhance customers' loyalty. We find that an increase in adoption of the net-based customer service by the customer base is not always desirable for firms. and that customers who utilize such services are better off only when the overall adoption is limited.

• 한국멀티미디어학회논문지
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• 제13권11호
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• pp.1594-1609
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• 2010

최근 가상화와 클라우드 컴퓨팅 이슈가 대두되면서 서비스 품질과 성능 안정성을 보장하기 위한 대안으로서 시스템 자원 관리의 필요성이 부각되고 있으며, 디스크 입출력 자원은 오랜 기간 동안 심각한 성능 병목으로 인식되어 왔다. 다수의 서비스들이 입출력 자원에 대하여 경쟁 상태에 있는 경우, 낮은 중요도를 갖는 서비스 또는 프로세스들에 의하여 제한된 입출력 자원들이 점유되는 경우가 빈번하게 발생하며, 이는 중요 서비스의 품질 및 성능을 저하시키는 요인으로 작용한다. 또한, 특정 프로세스 또는 서비스가 사용할 수 있는 입출력 자원을 예측할 수 없는 경우에는 서비스의 성능 안정성 및 품질을 보장할 수 없으며 제한된 자원에 대한 효율적인 사용을 어렵게 만드는 문제점을 갖는다. 따라서, 본 논문에서는 상기 문제점의 개선을 위하여 예측 가능한 입출력 대역폭을 제공하는 서비스 기반 디스크 입출력 제어 방식을 제안하며, 제안 방식은 서비스 기반의 예측 가능한 입출력 대역폭을 제공함으로써, 안정적인 서비스 품질 및 성능을 유지하도록 하며, 제한된 입출력 자원의 효율적인 사용을 가능하게 한다.

• 한국동물위생학회지
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• 제35권4호
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• pp.275-281
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• 2012

Canine brucellosis is the zoonosis in worldwide and Brucella (B.) canis is a facultative intracellular pathogen that has a very limited host. MLVA-16 (Multilocus VNTR analysis) is a efficient method for genotyping of Brucella species. Various methods have been established for genotyping of Brucella species, but most of analytical method is lack reproducibility and limited capability to differentiate them. B. canis isolates (n=73) from 7 farms in Gyeongbuk province in 2003~2010 were analyzed using 16 VNTR loci. Automatic electrophoresis system was utilized for more high throughput and rapid simple discrimination. Thirty two genotypes were identified from 73 B. canis isolates. MLVA could contribute to molecular typing for epidemiological evaluation of canine brucellosis.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2001년도 The Pacific Aisan Confrence On Intelligent Systems 2001
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• pp.198-201
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• 2001

Recently the wireless-internet has been spreading extensively. People are spending a large part of their time gaining access to information using a mobile device. With the rapid growth of on-line Electronic Commerce, the use of mobile devices creates a new paradigm that provides users with location-independent real time service. Although this new paradigm does have some advantages, limited process speed, low bandwidth, the low battery capacity of mobile devices, and a high rate of wireless network errors causes many overhead expenses during service time with the server. In this paper, we suggest an autonomous service delivery system, which provides mobile agent capability to users that cannot maintain a connection. We have developed the system based on java mobile agent technology. Using this system, we can provide more effective service to users when the user is sending requirements for service through a mobile device that has limited resources. Furthermore we can manage the contact server dynamically when new services are added.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2000년도 봄 학술발표논문집 Vol.27 No.1 (A)
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• pp.187-189
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• 2000

Nowadays, efforts are in progress for the standardization of CORBAbased telecommunication network management framework. To implement a network management system based on the framework completely, CORBA ORB and some of CORBA service should be installed in the element. And then, there must be the naming tree, which correspond to the containment relationships between components in the network element. If we use conventional OMG naming service to form the naming tree, all MOs, a software fragmenthat corresponds to each component in a system, should be instantiated. However, the network element is usually a kind of limited resource system, which cannot provide sufficient resources for applications run on it. Hence, instantiatingall MOs can cause problems for that kind of system, This paper presents Smart Naming Service architecture as a solution to the problem.

• 한국정보과학회논문지:정보통신
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• 제28권4호
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• pp.477-488
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• 2001

무선 네트워크 환경에서는 네트워크의 제한된 대역폭과 이동 호스트의 잦은 셀 간 이동으로 인하여, 각 호스트가 요구하는 서비스의 질(Quality of Service)을 보장하기 힘들다. 이런 무선 통신의 특성에서도, 실시간 서비스와 같은 특정 종류의 서비스의 경우에는 요구되어지는 범위 내에서 그 서비스의 질이 반드시 보장되어야 한다. 본 논문에서는 무선 이동 네트워크 환경에서 각 서비스의 서비스 율을 어떻게 조정할 것인가에 대해 논의한다. 무선 네트워크 환경에서 이동 호스트가 다른 셀로 이동하였을 경우, 부족한 대역폭을 고려하여 호스트의 서비스 율이 조정된다. 본 논문에서 각 플로우의 QoS Spec을 고려하여 서비스 율을 할당하는 알고리즘을 제안한다. 제안된 알고리즘에서는 각 플로우가 요구하는 QoS spec 값에 비례하도록 서비스 율을 정하여 부족한 네트워크 자원을 동적으로 할당함으로써, 무선 네트워크 자원을 보다 효율적으로 사용할 수 있게 한다.

• 로봇학회논문지
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• 제3권4호
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• pp.278-286
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• 2008

Reliable functionalities for autonomous navigation and object recognition/handling are key technologies to service robots for executing useful services in human environments. A considerable amount of research has been conducted to make the service robot perform these operations with its own sensors, actuators and a knowledge database. With all heavy sensors, actuators and a database, the robot could have performed the given tasks in a limited environment or showed the limited capabilities in a natural environment. With the new paradigms on robot technologies, we attempted to apply smart environments technologies-such as RFID, sensor network and wireless network- to robot functionalities for executing reliable services. In this paper, we introduce concepts of proposed smart environments based robot navigation and object recognition/handling method and present results on robot services. Even though our methods are different from existing robot technologies, successful implementation result on real applications shows the effectiveness of our approaches.