• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권4호
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• pp.1638-1654
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• 2018

The heterogeneous network (HetNet) has been one of the key technologies in Long Term Evolution-Advanced (LTE-A) with growing capacity and coverage demands. However, the introduction of femtocells has brought serious co-layer interference and cross-layer interference, which has been a major factor affecting system throughput. It is generally acknowledged that the resource allocation has significant impact on suppressing interference and improving the system performance. In this paper, we propose a hybrid-clustering algorithm based on the $Mat{\acute{e}}rn$ hard-core process (MHP) to restrain two kinds of co-channel interference in the HetNet. As the impracticality of the hexagonal grid model and the homogeneous Poisson point process model whose points distribute completely randomly to establish the system model. The HetNet model based on the MHP is adopted to satisfy the negative correlation distribution of base stations in this paper. Base on the system model, the spectrum sharing problem with restricted spectrum resources is further analyzed. On the basis of location information and the interference relation of base stations, a hybrid clustering method, which takes into accounts the fairness of two types of base stations is firstly proposed. Then, auction mechanism is discussed to achieve the spectrum sharing inside each cluster, avoiding the spectrum resource waste. Through combining the clustering theory and auction mechanism, the proposed novel algorithm can be applied to restrain the cross-layer interference and co-layer interference of HetNet, which has a high density of base stations. Simulation results show that spectral efficiency and system throughput increase to a certain degree.

• 한국도서관정보학회지
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• 제22권
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• pp.205-244
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• 1995

Originally the concept of the traditional resource sharing has been discussed in the context of bibliographic materials, and has been labor-intensive and high-cost activities. The technology has had a great impact on such pattern of the resource sharing, and has expanded the limited scope of the traditional concept into the sharing of library information in the levels of local, regional and national systems, and expertise, materials, facilities, equipments and personnels of the library system. While the traditional circulation service as a basic method to share library materials by users can provide the resource to a single person at a time, the electronic resource can be shared, by multi-users at a time anytime anywhere. The maximization of the electronic resource sharing requires that publishing process should be fundamentally changed and articles, books, chapters, speech manuscripts, music scores, maps, sound, and other formats of materials should be prepared in machine readable format. This study examined the positive effects of the technology on the resource sharing, but not investigate the concrete and complex problems as to the cost, guidelines, detailed procedures, design details, and intellectual properties and protection involved in the resource sharing. Some findings extracted from the study can be summarized as follows; (1) ILL will lose its meaning as a method to share the materials if they are all in the electronic format and the phrase 'networked information resource' becomes omnipresent. (2) The technology keeps on changing the concept of resource sharing. Today, the scope of resource sharing not only encompasses the sharing of the primary and secondary materials but also the sharing of the processings(eg. cataloging), expertise, user education, special facilities, and the integrated automated library systems. (3) The sharing of the networked resource will be a method to provide better services for library users in the low cost. (4) The a n.0, pplication of the technology to the resource sharing should be focus on the method which allows an end-users to do the direct access to the needed materials, and to be delivered the primary document as soon as possible.

• 한국통신학회논문지
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• 제32권7B호
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• pp.422-430
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• 2007

현재 WDM-PON 기술은 FTTH 구축을 위해 가장 핵심적인 가입자망 기술로 인식되고 있다. 하지만 시스템 비용의 많은 부분을 차지하는 광 송수신기 및 RN과 밀접한 관계가 있는 WDM-PON 시스템 자원의 고정적인 관리방법은 비용 대비 시스템 자원 효율성에 한계점을 가지고 있다. 이에 본 논문에서는 자원의 동적 관리가 가능하면서 이를 위한 시스템의 구축비용 최소화를 이룰 수 있는 WDM-PON 구조를 제안한다. 이를 위해 ONU의 논리그룹화 및 논리그룹 간 파장 공유를 위한 OLT, ONU 그리고 RN의 구조를 설계하고, 이를 기반으로 탄력적인 동적자원 관리를 위한 동적 자원 할당 기법을 제안한다. 이와 같은 WDM-PON 구조의 성능 분석을 위해 모의실험을 수행하였고, 그 결과 논리그룹의 크기와 시스템 구축비용의 상관관계 및 논리그룹 크기와 동적 자원 할당 능력의 상관관계를 도출할 수 있었으며, 자원 관리 기법의 동적 자원 할당 능력과 공평성 유지 능력을 확인할 수 있었다.

• 통상정보연구
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• 제8권3호
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• pp.385-396
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• 2006

The successful knowledge and information based companies facilitate to restructure the industry and strengthen the national competitiveness in the future. The advent of information age provides us new challenge because the information breakthrough can play a pivotal role in terms of knowledge transfer in the human resource management. Executive officer must present long term vision in order to expand enterprise continuously and establish long term management goal and strategy which are appropriate for key organizational skills of future management environment (Pfeffer, 1998). Also, long term talent management based on vision, goal and strategy and talent development strategy and employment management must be established (小池, 1994)). American HRM system's reformation cannot be defined without scientific management policy. However, currently widely discussed Japanese HRM system's reformation cannot be defined without organizational commitment focused Japanese employment system. (津田, 1992 ; 太田, 1994). Japan's development of the following policies are behind comparing to Europe : (1)Skill based talent management regardless of age, sex, nationality, race and academic background (2)Consideration of retirement age of 64 (3)Creativity and freedom promoting talent management policy. Also, there are problems to be solved. Solutions will be searched for by establishing new wage policy based on tasks and individuals in the basis of lifetime employment system.

• Journal of Communications and Networks
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• 제12권3호
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• pp.266-274
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• 2010

The efficient network resource management is one of the important topics in a real-time system. In this paper, we present a practical network resource management framework, control-theoretic packet scheduler (CPS) system. Using our framework, an operating system can schedule both input and output streams accurately and efficiently. Our framework adopts very portable feedback control theory for efficiency and accuracy. The CPS system is able to operate independent of the internal network protocol state, and it is designed to schedule packet streams in fine-grained time intervals to meet the resource requirement. This approach simplifies the design of the CPS system, and leads us to obtain the intended output bandwidth. We implemented our prototype system in Linux, and measured the performance of the network resource management system under various network QoS constraints. The distinctive features of our principles are as follows: It is robust and accurate, and its operation is independent of internal network protocols.

• 한국지능정보시스템학회:학술대회논문집
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• 한국지능정보시스템학회 2007년도 한국지능정보시스템학회
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• pp.123-137
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• 2007

The information space of semantic web comprised of various resources, properties, and relationships is more complex than that of WWW comprised of just documents and hyperlinks. Therefore, ranking methods in the semantic web should be modified to reflect the complexity of the information space. In this paper we propose a method of ranking query results from RDF(Resource Description Framework) knowledge bases. The ranking criterion is the importance of a resource computed based on the link structure of the RDF graph. Our method is expected to solve a few problems in the prior research including the Tightly-Knit Community Effect. We illustrate our methods using examples and discuss directions for future research.

• 정보기술과데이타베이스저널
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• 제1권2호
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• pp.127-145
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• 1994

컴퓨터의 각종 응용 시스템들이 다루는 데이타의 양과 복잡도가 높아짐에 따라 이를 효율적으로 다루기 위해 메타-데이타(meta-data)의 중요성이 날로 부각되고 있다. 하지만, 현재 DBMS의 기능은 조직체내의 데이타의 사용을 기술하고 제어하는 메타 데이타인 정보 자원(information resource)의 관리에는 그 기능이 미치지 못하고 있다. 최근들어, 이런 정보 자원들을 효율적으로 다루기 위해 차세대 정보 관리 시스템으로서 정보 자원 사전 시스템(Information Resource Dictionary System)이 제안되었다. 본 논문에서는 현재 표준화중인 정보 자원 사전 시스템을 분석하고, IRDS 서비스 인터페이스를 관계 DBMS를 기반으로 설계하고 구현하였으며, 이를 응용하여 그 효용성을 실험하였다.

• Asia pacific journal of information systems
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• 제9권1호
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• pp.59-75
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• 1999

Currently, many companies are trying to be more competitive by implementing the most appropriate software package, called ERP (Enterprise Resource Planning). ERP can support the company's business process. A repository, which can store and retrieve enterprise-wide information, is a key component of such software package. This paper implements an enterprise repository for the ERP. A well-known repository standard, IRDS (Information Resource Dictionary System), is employed for the repository architecture. The proposed metadata schema can help develop database, business applications, models, and workflow. To illustrate the practical usefulness, a real-life ERP prototype is built within the framework of the proposed repository.

• 한국정보통신학회논문지
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• 제17권9호
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• pp.2097-2104
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• 2013

과학기술연구의 데이터가 기하급수적으로 증가함에 따라 대용량 데이터 처리를 위한 컴퓨팅 및 저장장비의 필요에 따라 한국과학기술정보연구원(KISTI: Korea Institute of Science and Technology Information)은 글로벌 대용량 실험데이터 허브센터(GSDC: Global Science experimental Data hub Center)를 구축하여 지원하고 있다. KISTI는 급격히 확산되고 있는 모바일 기기에서 이용이 가능한 GSDC의 글로벌 커뮤니티 및 서비스를 위해 모바일 웹 표준으로 Mobile User Portal Service(MUPS)를 구축하였다. 그리고 이러한 MUPS에서 GSDC의 운영상태 및 시스템 자원 분석을 위해, 본 논문에서는 모바일 웹 환경에서 GSDC의 시스템 자원 모니터링 방법을 연구하고 구현하였다. GSDC의 연구지원 시스템은 Scientific Linux로 운영되고 있고, Sysstat 자원 감시 도구를 통해 sadc(system activity data collector)로 시스템자원 활용 정보를 모은 후 sar(System Analysis Report)를 통해 리포트를 매일 작성한다. 본 논문에서는 이러한 sar 리포트를 모바일 환경에서 시각화하여 활용이 가능하도록 모바일 웹으로 설계하고 구현하였다. 모바일 웹으로 구현함으로써 특정 OS에 종속되지 않은 다양한 모바일 OS에서 사용이 가능하고, 기존의 모니터링보다 쉽고 간편하게 시스템 모니터링이 가능하다.

• 한국컴퓨터정보학회논문지
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• 제22권3호
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• pp.35-43
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• 2017

In IoT(Internet of Things) environment, users want to receive customized service by users' personal device such as smart watch and pendant. To fulfill this requirement, the mobile device should support a lot of functions. However, the miniaturization of mobile devices is another requirement and has limitation such as tiny display. limited I/O, and less powerful processors. To solve this limitation problem and provide customized service to users, this paper proposes a collaboration system for sharing various computing resources. The paper also proposes the method for reasoning and recommending suitable resources to compose the user-requested service in small device with limited power on expected time. For this goal, our system adopts MBTI(Myers-Briggs Type Indicator) to analyzes user's behavior pattern and recommends personalized resources based on the result of the analyzation. The evaluation in this paper shows that our approach not only reduces recommendation time but also increases user satisfaction with the result of recommendation.