• Journal of the Economic Geographical Society of Korea
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• v.18 no.2
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• pp.206-223
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• 2015

Korea government has established 67 agri-food clusters for 10 years. In recent years, the criticism of this policy has significantly increased due to trials and errors. The purpose of this study is to suggest some policy implications for the focal firm and governance mechanism through the case study of Muan Loess Sweet Potato Cluster. The concept of netchain was used as an analysis framework. Muan Loess Sweet Potato Cluster doesn't operate an integrated production organization and focal firm doesn't exercise its influence as well. The cluster agency, focal firm of Cluster, is important for a Agri-food Cluster to grow continuously. it must have a great influence on organizing networks and an enough capacity for forming coordination mechanism. Also, Local governments must actively be involved in the network formation and coordination and inform the vision and plan for development.

• Journal of KIISE:Databases
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• v.28 no.4
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• pp.568-576
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• 2001

Most of clustering algorithms data to degenerate rapidly on high dimensional spaces. Moreover, high dimensional data often contain a significant a significant of noise. which causes additional ineffectiveness of algorithms. Therefore it is necessary to develop algorithms adapted to the structure and characteristics of the high dimensional data. In this paper, we propose a clustering algorithms CLIP using the projection The CLIP is designed to overcome efficiency and/or effectiveness problems on high dimensional clustering and it is the is based on clustering on each one dimensional subspace but we use the incremental projection to recover high dimensional cluster and to reduce the computational cost significantly at time To evaluate the performance of CLIP we demonstrate is efficiency and effectiveness through a series of experiments on synthetic data sets.

• Journal of the Economic Geographical Society of Korea
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• v.21 no.2
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• pp.173-191
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• 2018

Taking note of growing tendency of academic interests and policy applications with regard to social economy, this study aims to suggest economic geographical agenda for social economy. It is presumed that the orientation of social economy toward pursuing social value will exhibit unique spatial characteristics. Elements containing spatial implications have been identified through a review of hierarchial concepts including social innovation, social economy organization and social enterprise. Three approached are suggested as tools of understanding the spatial context of social economy: spatial characteristics inspiring social entrepreneurship, place-based context of decision-making by social economy organizations, and spaces formulated by interactions between the demand for solving social problems and the supply of economic resources. The investigation of social innovation clusters is required to focus on the differentiated characteristics from normal industrial clusters. It is also suggested that the concept of embeddedness be applied in the search of the essence and elements of social economy's ties with local community.

• 한국디지털정책학회:학술대회논문집
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• 2003.12a
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• pp.489-505
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• 2003

본 연구는 정보통신 산업 클러스터의 사례분석을 통해 제조업과 비교.분석하여 정책적 방향을 제안하고자 한다. 국내외 정보통신 산업 클러스터의 사례로 미국의 실리콘밸리, 일본의 테크노폴리스, 중국의 중관촌, 스웨덴의 시스 타와 국내의 대덕 밸리를 중심으로 특성을 도출하고자 한다. 산업 클러스터는 마이클 포터의 연구를 시작으로 하여 OECD 에서 국가혁신체제의 주요 주제로 제안하면서 국가 경쟁력의 핵심으로 등장하게 된다. 정보통신의 발달은 지역에 기반한 글로벌 경쟁력을 가진 산업 클러스터에 대한 체계적인 연구와 이에 대한 정책개발의 필요성이 증대되고 있다. 정보통신 산업 제품의 특성상 기술혁신 속도가 빠르고 제품의 라이플 사이클이 제조업 제품에 비해 짧은 특징을 지니고 있어, 투자에 대한 위험 (risk)이 발생한다. 또한 지식창조산업으로서 생산위주의 제조업과는 다른 지리적, 공간적 특성에 차이가 있으며, 고급 인력기술자의 활용도가 높아 안정적인 환경이 요구된다. 따라서 통신, 교통 등의 물리적인 기반시설뿐만 아니라 정보통신 관련 업체간 연계와 독특한 사회.문화적인 분위기 등이 어울려져 있음을 살펴볼 수 있다. 이러한 정보통신 산업 클러스터의 특성을 통해 본 연구는 경제의 신 성장동력 중에 하나인 정보 통신산업의 경쟁력을 높이고 세계적 수출산업으로 육성, 정보통신 중심지로서의 역할 수행 및 동북아 경제 중심 실현을 위해 정책적인 제안을 한다.

• Review of Culture and Economy
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• v.21 no.3
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• pp.89-124
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• 2018

Although design industry belongs to one of the creative industries and contributes significantly to urban cultural economy based on its cluster formation, researches on design industry are rarely made explicit from the perspective of creative industry cluster. After reviewing the life cycle of design industry clusters in Euljiro and Hongdae Area in Seoul, this study compares these two clusters with respect of diverse dimensions of creative industry cluster such as agglomeration economy, spin-off activities and institutional environments. Research methodology includes the analysis of ?Seoul Business Statistics? and the in-depth interviews with 14 professional designers. The result shows that design industry cluster in Euljiro is close to the traditional industry cluster mainly dependent on printing industry with very limited impact on urban economy, while Hongdae Area develops creative industry cluster by virtue of university spin-offs, art markets, hybrid cultural consumption spaces and the active participation of designers contributing to urban economy in diverse ways. This comparative analysis highlights the importance of various environmental components to encourage creative activities in developing the creative industry cluster.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.19 no.5
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• pp.87-91
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• 2019

WSN is a wirelessly configured network of sensor nodes with limited power such as batteries. If the sensor node's battery is exhausted, the node is no longer available. Therefore, if the network is to be used for a long time, energy consumption should be minimized. There are many Wireless Sensor Network Protocols to improve energy efficiency, including Cluster-based and chain-based Protocols. Cluster-based Protocols elect Cluster Heads and divide sensor field into Clusters. The Cluster Head collects the data in the Cluster and transmits it to the Base Station. In the case of nodes elected as Cluster Heads, there is a problem of energy consumption. The chain-based Protocol links sensor nodes in a chain and finally transmits all data to the Base Station. In this paper, we intend to increase the network lifetime by using a chain to reduce the energy consumption of the Cluster Head in the Cluster-based Protocol, LEACH Protocol.

• Journal of KIISE:Computing Practices and Letters
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• v.9 no.6
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• pp.635-645
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• 2003

One of very important features that are necessarily supported by clustered parallel computer systems is a single I/O system image in which users can access both the local and remote I/O resources transparently. In this paper, we propose an efficient disk sharing technique supporting a single disk I/O system image architecture. The design separates the I/O subsystem of a cluster into the file system and a set of virtual hard disk drivers. The virtual hard disk driver deals with a hard disk in the remote node as a local hard disk. All services provided by it are performed in the device driver level without any modification of file systems. Users can, therefore, access all the disks in the cluster regardless of their locations. Our virtual hard disk driver is implemented under the linux, and also tested in a linux cluster system. We find by experiments that it can successfully support a single disk I/O space, and at the same time it shows better performance than NFS. We are sure that this paper can be a guideline for single I/O space of other devices to be easily constructed.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.304-306
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• 2001

웹 클러스터링 시스템은 사용자의 집중에 의한 서버의 과부화해 효율적으로 대처할 수 있는 방법 중 하나이다. 공간 질의의 대부분은 인접 영역에 대한 경우가 매우 잦으며. 특정 영역에 집중되는 특성을 갖는다. 타일 기반 웹 GIS 클러스터링 시스템은 이러한 공간 질의의 특성을 만족시키면서 클러스터에 포함되는 각 노드의 버퍼 재 사용률을 높이고 디스크 접근 빈도를 낮출 수 있는 기법을 사용한다. 그러나, 모든 질의가 디스패처를 거치기 때문에 병목현상이 나타날 수 있으며, 질의의 빈도가 낮은 지역의 경우 할당된 지역의 범위에 의해 버퍼 관리에 문제가 생긴다. 본 논문에서는 확장된 WARD기법을 사용한 웹 GIS 클러스터링 시스템을 제안한다. 제안되는 시스템은 타일 기반 웹 GIS클러스터링 시스템을 기반으로 디스패처를 분산시켜 병목현상을 줄이고, 각 지역을 그룹으로 묶어 플러스터를 분배하여 대용량의 공간 데이터를 위해 적절한 버퍼 관리를 한다. 또한, 질의가 집중되는 영역에 대한 레이어를 모든 노드의 코어 영역에 중복 저장하여 로컬에서 지역적으로 처리하고 다른 노드로의 처리 요구에 대한 포워딩(Forwarding) 오버헤드를 줄여 기존의 서버에 비해 안정성와 확장성 그리고 처리 능력을 향상시킬 수 있다.

• Aerospace Engineering and Technology
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• v.11 no.1
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• pp.68-77
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• 2012

Flow characteristics of base region of small scaled 4 nozzle clustered engine has been analyzed with CFD approach along with the tests of numerical methods. The numerical test shows that Spalart-Allmaras turbulence model is appropriate for the present research. Plumes expanded from nozzles exits collide with each other and make high pressure stagnation region. Some of collided plumes expand again reversely into the base region with supersonic speeds. The reversed plume in the base region goes out to the outer region through the minimum vent area formed by the nearest nozzle exterior surfaces. But different from the empirical theory, the minimum vent area does not play a role of throat. Additionally the temperature of the nozzle inner surface strongly affects the temperature of the reversed plumes.

• The Journal of the Korea Contents Association
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• v.21 no.4
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• pp.434-446
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• 2021

Recently, there has been a growing interest in the fourth industrial revolution, expected to have a significant impact on society. However, there are only a few studies on spatial distribution and location of the fourth industry. This study tried to classify the spatial distribution of the fourth industry by using LQ, a non-geographical method, and Getis-Ord's Gi^*, a geographical method. The results of the analysis are as follows. First, there are the specialized areas of the fourth industry in the non-Seoul metropolitan area as well as the Seoul metropolitan area. Second, industrial clusters and neighborhood areas of the fourth industry were located mostly in the Seoul metropolitan area. Third, industrial clusters were concentrated on the southern part of Gyeonggi Province and Seoul, and there are no industrial clusters in the northern part of the Seoul metropolitan area and the nature conservation area. This paper shows that the cluster area of the fourth industry is concentrated in the Seoul metropolitan area. Therefore, policies for the 4th industry are needed to solve this unbalanced spatial distribution of the fourth industry.