• The Journal of Korean Institute of Communications and Information Sciences
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• v.30 no.8B
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• pp.514-524
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• 2005

In optical burst switching(OBS) networks, the ingress edge router assembles packets in the same class queue into the appropriate size of burst. A burst control packet(BCP) is generated for channel reservation of corresponding data burst and sent earlier than the corresponding data burst with an offset time. Offset time is determined considering the number of hops from source to destination and the required quality of service(QoS). After offset time, the burst data is passed through tile pre-configured optical switches without any O/E/O conversion. But a failure in OBS networks may lead to the loss of bursts until the ingress nodes receive the failure indication signal. This results in a significant degradation in QoS. Therefore, in this paper, we propose a fault-tolerant node architecture based on sub-carrier multiplexing to reduce the effects of failure in OBS networks. The Performance of the proposed fault-tolerant node architecture exhibits considerable improvement as compared with the previous ones.

• Journal of the Korea Society of Computer and Information
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• v.12 no.3
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• pp.147-153
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• 2007

Task scheduling is an essential part of any computer system for allocating tasks to a processor of the system among various competitors. As we know, in real-time system, the failure of scheduling a hard real-time task my lead to disastrous consequence. Besides efficiency, resource and speed, real-time system has to take time constraint in serious consideration. This paper proposes a priority-driven scheduling algorithm for real-time multiprocessor system. which is called L-RE coordinates algorithm. L-RE coordinates is a new way of describing the task scheduling problem. In the algorithm, we take both deadline and laxity into consideration for allocating the priority. The simulation result shows that the new algorithm is viable and performance better than EDF and LLF algorithm on schedulability and context switch respectively.

• Journal of the Korea Society of Computer and Information
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• v.10 no.1 s.33
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• pp.73-84
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• 2005

An increasing in quantity of multimedia data brought a new problem that expected data should be retrieved fast and exactly. The adequate representation is a key element for the efficient retrieval For this reason, the MPEG-7 standard was established for description of multimedia contents in 2001. Recently, the new metadata were developed to represent characteristics of movie information resources by Korea Federation of Film Archives. In this paper. we designed and implemented a movie information retrieval system. This system used XML schema to accept movie information metada. This system offers a keyword retrieval using high-level metadata based on movie information and similarity retrieval using low-level metadata based on MPEG-7. As a result, that ill be Possible more efficient movie information interchange . movie information metadata reuse and fast retrieve.

• Journal of Digital Convergence
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• v.14 no.8
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• pp.269-276
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• 2016

Public Safty-LTE(Long Term Evolution) is being deployed in the direction of reducing cost by using both of municipal network and commercial network. However, LTE Network is difficult to ensure the survivability during the information communication infrastructure failures. In addition, it is vulnerable in communication coverage of inside buildings and underground. In this study, we propose to implement effectively the network survivability technique through the convergence to the proven technology. As the advent of the IoT Age, smart sensors which are embedded in the environment and the things will be able to provide a useful infrastructure for ensuring the network survivability. Based on the feature of the smart sensor, we designed the sink node architecture to guarantee the network survivability in disaster situation through the convergence of the small cell technology and extension of wireless network coverage technology. The computing power inherent in the environment is a valuable resource that can be utilized in the disaster situation.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.12 no.1
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• pp.257-264
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• 2012

The development of mobile devices and the spread of wireless network help share and exchange information and resources more easily. The bond them to Cloud Computing technology help pay attention to "Mobile Cloud" service, so there have been being a lot of studies on "Mobile Cloud" service. Especially, the important of 'Recommendation Service' which is customized for each user's preference and context has been increasing. In order to provide appropriate recommendation services, it enables to recognize user's current state, analyze the user's profile like user's tendency and preference, and draw the service answering the user's request. Most existing frameworks, however, are not very suitable for mobile devices because they were proposed on the web-based. And other context information except location information among user's context information are not much considered. Therefore, this paper proposed the context-aware framework, which provides more suitable services by using user's context and profile.

• Korean Journal of Construction Engineering and Management
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• v.14 no.2
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• pp.117-130
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• 2013

It is a difficult thing to administer a various task in the construction site because, the person placing an order are eagerly demanding for the reduction of project duration as the trend of construction are becoming larger and international. The advanced country have made an effort to development PMIS based on the Web, which to exchanges a various construction information such as Time Management/Construction Management/Resource Management/Document Management to solve these problems since 2000. However, the expectation to develop a smart PMIS that can deal with a more quick change of a various process are becoming lager as the lively supply of IT equipment such as smart phone and table PC. The research are aim to develop the next generation smart PMIS, which is link with the table PC and smart phone for a site manager to use the system based on the web in the movement. Also, it has an object in view to introduce the development process and the major function of the next generation PMIS.

• Journal of the Korean Society for Library and Information Science
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• v.51 no.2
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• pp.95-116
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• 2017

This study investigated whether applying the Project-Based Learning in LIS education affects students' self-efficacy for group work in a positive direction and if the authenticity of the project has any relationship with their self-efficacy for group work. 26 students were surveyed before and after they took the "Evaluating Digital Library Systems" course with the same set of questions asking about their perceptions on the individuals' capabilities to successfully perform group tasks and their perceptions about the project's authenticity. The paired sample t-test showed statistically significant differences between the results of the pre- and post-test, in terms of their capabilities as a leader as well as exchanging, evaluating, and integrating ideas when performing group activities. In addition, the authenticity of the project's task shows some correlation with subfactors of students' self-efficacy for group work.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.2 no.3
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• pp.409-416
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• 1998

TMN(Telecommunication Management Network) provides underlying structure to transfer, store and processing management information which are necessary for Telecommunication network and service management. The application of TMN is widely applicable to Analogue telecommunication network Public and private network switching system, Transmission system, Telecommunication related software and logical telecommunication network resource management and others. This paper consider TMN as one System Under Test(SW), and propose a new TMN test architecture, besides existing simulation based test method, which is able to test, on the basis of standardized testing procedure and testing method, directly with test system. There are several fields in protocol testing and one of them is protocol conformance testing which is defined in ISO/IEC 9646 series and it has twin document as ITU X.290 series. To apply this standardized procedure on TMN testing it is prerequisite to devise a new TMN testing architecture and set up testing procedures according to the new architecture.

• Water for future
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• v.22 no.4
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• pp.415-415
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• 1989

자연재해연구는 인간.자연환경 관계를 연구하는 학문이다. 금세기초 환경결정론, 환경가능주의, 그리고 인지에 의한 행동과학주의로 연구 Paradigm이 변화.발전되어 오며서 지리학에서도 이러한 이론적 방법론의 바탕위에 인간-자연환경 관계를 설명하려고 노력했다. 1920년대 초 Barrow가 인간생태학 개념을 발표, 1950, 1960년대 이에 영향받은 White, Kate와 Burton 같은 미국의 자연재해지리학자들은 미국에서 홍수재해문제를 인간적응, 특히 "인식"의 역할에 중점을 두어 재해지역에서 자원이용과 이의 관리문제를 연구하였다. 1970년대 들어오면서 재해의 양상, 적응방법등이 연구되고, 또한 적응의 여러 비교연구가 있었으며, 사회성과 관련 사회학적 연구 접근과 다양한 레벨의 케이스 Study 또한 이루어졌다. 오늘날의 자연재해연구는 일반재해연구로 발전하여 핵반응, 각종산업.교통재해, 화학물질 및 환경오염문제, 각종 소음공해, 폭발물 사고 등 참으로 여러 종류의 사회문제가 재해연구의 대상이 되었고, 근래에는 약물중독, 성폭행, 그리고 복잡한 현대사회에서 제기되는 정신질환까지 일종의 재해문제로 다루어 지리학내에서 연구되고 있다. 이와같이 연구의 많은 변환.발전과 함께 처음 Academic한 연구로 시작된 재해문제 연구가 이에 관심을 같는 여러분야 즉, 경제.사회, 심리학자, 토지이용개발자, 보험, 은행, 부동산업자 재해와 관련있는 민간단체, 정부기관, 정책실행기관등이 참여하는 공동연구가 활발히 행하여지고 있다. 최근에는 "세계 자연재해 감소 10개년 계획"이라는 Program을 미국이 주동이 되어 국제적인 기구로 만들어 관심있는 여러국가의 과학자, 재해연구가, Engineer, 정부관계자들이 참여 서로 정보와 지식의 교환, 세계의 개발.재개발에 대한 계획, 재해감소의 교육훈련등 다채로운 Project을 가지고 세계 자연재해 감소를 위하여 공동연구의 노력을 하려는 움직임이다. 세계의 권위있는 재해통계에 의하면 한국이 매년 자연재해로 인하여 100만명당 1,000명이 희생되는 나라로 방글라대시, 이란, 중남미와 페루, 과태말라, 동남아시아의 뉴기니와 나란히 중진개발도상국으로 몇안되는 나라의 하나로 들어있는 것을 볼 때 유감이 아닐수 없다. 우리나라는 하루빨리 이러한 자연재해로부터 아까운 생명과 재산을 잃어버리고 있는 고통과 문제를 해결하려는 민간.정부차원에서 관심을 기울이고 우선 기본적인 연구의 기틀을 마련하는 제도적 장치와 분위기가 아쉽다고 않을 수 없다.와 분위기가 아쉽다고 않을 수 없다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.12 no.10
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• pp.1866-1874
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• 2008

Existing web server lowers the whole capacity of system because of the problem on the processing load of server by closing connection increasing code handshake operation, and remarkable decrease of server capacity if it is the state of overload. Also, there occurs disadvantages of increasing connection tine about client's request and response time because handling of client's multi-requests is not smooth because of thread block and it requests a lot of time and resources for revitalization of thread. Therefore, this paper proposes the extended web server which provides the technique for delay handling and improves the overload of server for better system capacity, communication support, and the unification which is the advantage of web service. And it evaluates the existing system(implemented at Tomcat 5.5) and the proposed mobile web server architecture. The extended server architecture provides excellent exchange condition for system capacity and evaluates improved web server architecture which combines multi-thread with thread pool. The proposed web service architecture in this paper got the better result of improved capacity benefit than the evaluation result of original Tomcat 5.5.