• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2015.10a
• /
• pp.331-333
• /
• 2015

Data is increasing explosively with the spread of networks and mobile devices and there are problems in effectively processing the rapidly increasing data using existing recommendation techniques. Therefore, researches are being conducted on how to solve the scalability problem of the collaborative filtering technique. In this paper applies MapReduce, which is a distributed parallel process framework, to the collaborative filtering technique to reduce the scalability problem and heighten accuracy. The proposed technique applies MapReduce and the index technique to a user-based collaborative filtering technique and as a method which improves neighbor numbers which are used in similarity calculations and neighbor suitability, scalability and accuracy improvement effects can be expected.

• Proceedings of the Korean Society of Computer Information Conference
• /
• 2015.07a
• /
• pp.333-334
• /
• 2015

2012년 12월 협동조합기본법이 시행된 이래, 2015년 6월 현재 전국적으로 약 7,300여개의 협동조합이 설립되어 조합원들의 유기적인 공동활동을 통해 공동사업을 수행하고 있다. 소상공인협동조합, 사회적협동조합 등 다양한 형태의 협동조합은 자신들의 공동목적을 달성하기 위한 요소로 업무정보 공유에 기반한 협업이 필수적이라고 인식하고 있다. 기획재정부의 분류에 따르면 21개의 업종으로 다양한 산업군에 걸쳐 협동조합은 하나의 기업처럼 사업활동을 하고 있다. 하지만, 일반기업과는 달리 협동조합은 수직적인 경영구조가 아닌 조합원들 간의 수평적 경영조직을 갖는다. 본 논문에서는 공동사업 수행과 공동이익 창출이라는 협동조합의 특수한 사업모델과 전국에 산발적으로 분산되어 있는 조합원들 간의 공동업무 활동을 위한 협업 시스템을 제안한다.

• The KIPS Transactions:PartD
• /
• v.11D no.6
• /
• pp.1301-1310
• /
• 2004

In distributed office, the pairs can program together using a distributed pair programming system. Many CSCW tools featuring remote screen sharing function have insufficient usability, accessibility to introduce many developers to distributed pair programming. In this paper, we suggest a distributed pair programming system based on IDE, which many developers will accept and use easily. We have do#eloped a user scenario and GUI of the system, making distributed pair programming easier and designed with high extensibility by adapting design patterns and implemented in Java language. Our findings will be of significant help to developers dealing with implementation of distributed pair programming function into some commercial IDE.

• Journal of Information Technology and Architecture
• /
• v.9 no.3
• /
• pp.275-285
• /
• 2012

DIFs (Data Interchange Formats) are needed to enhance interoperability of physically distributed organizations in SBA (Simulation Based Acquisition) process. DIFs play a role as a template of DPDs (Distributed Product Descriptions) and provide capability to use information directly without data format interchange process by allowing access to DPDs, which include various information and M&S (Modeling & Simulation) resources. This characteristic is essential for interoperability in ICE (Integrated Collaborative Environment) based SBA. This paper proposes a framework for the DIF and outputs from each phase of acquisition process for configuration data related to design and manufacturing in SBA process - Conceptual Data Model, Logical Data Model, Physical Data Model and Physical DIF based on XML. Finally, we propose the DIF model architecture and demonstrate the implementation of DIF example based on it.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2009.11a
• /
• pp.173-174
• /
• 2009

기업이 관리하고 있는 중요한 정보자원들은 대부분이 여러 레거시 시스템에 분산 저장되어 있다. 그리고 저장되어 있는 정보 자원들 또한 서로 호환되지 않는 다양한 형태로 존재하고 있다. 이러한 문제를 해결하기 위해 분산된 데이터의 통합과 지식 공유를 위한 시스템이 필요하다. 데이터 통합의 목적은 기업의 조직과 주요 업무, 핵심 어플리케이션으로부터 발생하는 데이터 소스들의 표준 규칙과 메타 데이터를 이용하여 중복성을 제거하고, 오직 단일 데이터를 제공하는데 있다. 본 논문에서는 XMDR 기반의 OGSA-DAI를 이용하여 통합 검색 시스템을 설계 및 구현하였고, 분산되어 있는 레거시 시스템간의 데이터 통합검색이 가능한 시스템을 제안한다. 제안한 시스템은 분산된 레거시 데이터베이스간의 협업 환경 구성에 적합하며, 실시간 기업환경에서 빠른 정보 전달과 업무 지원 환경에 적절한 시스템이다.

• Journal of the Korea society of information convergence
• /
• v.5 no.2
• /
• pp.67-76
• /
• 2012

XML-based open protocol, XMPP users to pass messages to other users, which means that a decentralized communication network is the network infrastructure and enable it. In addition, XMPP servers using a professional server-to-server protocol to communicate with each other and decentralized social networks and collaboration framework provides an important possibility. In this paper, the features of XMPP messaging protocol is applicable to automotive telematics terminals XMPP-based platform design, and presence of two-way communication point for the problem, point-to-point session setup issues, security issues, compatibility issues, and to solve the scalability problem XMPP-based messaging system was implemented.

• Journal of Korea Multimedia Society
• /
• v.7 no.3
• /
• pp.388-398
• /
• 2004

This paper focuses on the reduction method of message traffic occurred when multiple participants collaborate in the distributed virtual environment. It is referred to as filtering method of update message to minimize data traffic exchanged in the virtual environment, and it is the essential process to improve the scalability of the virtual environment. Spatial partitioning method, a popular filtering technique, divides the whole environment into smaller sub-parts in order to make it small the regions to be maintained consistently. However, it is less flexible and adaptable because the information of area of interest must be configured before simulation. In this paper, the concept of dynamic area of interest is proposed, which is highly adaptable by applying dynamic environmental elements to AOI management. It uses multiple layering and multiple consistency algorithms for dynamic management, and makes it possible to consume system resource efficiently. For performance evaluation, experiments are performed with virtual avatars, measuring message traffic. Finally, the proposed model could be applied to the AOI management systems which accommodate massive users like MMORPG, or virtual communities.

• The KIPS Transactions:PartD
• /
• v.16D no.5
• /
• pp.701-714
• /
• 2009

In the enterprises the data integration based on service requires integrated data management as the change in the environment of enterprises accelerates. Cooperation among enterprises is accomplished through accessing distributed database using business process. As this approach is performed based on the global query, problems such as data heterogeneity, schema heterogeneity, and verification of validity have to be solved in advance for the interoperability among the heterogeneous system. Thus, cooperation requires dynamic and reliable construction. In this paper, we propose XMDR-DSM (eXtended MetaData Registry-Data Service Mediator) system for cooperation. XMDR-DSM, which is comprised of XMDR-DS, XMDR-DQP, and XMDR-DAI, supports the mapping between global schema and local schema and provides data access and integration service. Therefore, XMDR-DSM enables the mutual support of business operations among heterogeneous database. In addition, it can secure information as reusable asset and the standardization of interchange. Also it can manage unified information since it provides business process based on workflow; therefore, it will be able to increase the life span of information and reduce the cost.

• Journal of Internet Computing and Services
• /
• v.11 no.1
• /
• pp.167-181
• /
• 2010

WebDAV is an IETF standard protocol which supports asynchronous collaborative authoring on the Web. The WebDAV Access Control Protocol provides various methods of controlling the resources on a WebDAV server and their properties, helping high-level group activities to be performed through the WebDAV server. In this paper, to provide high level collaboration, we introduce a technique for managing access control over WebDAV resources through the WebDAV Access Control Protocol and describe the development of an access control manager for the CoSlide Collaborative system based on the technique. To provide users with the access control features in an easily understandable manner, the developed technique presents the privileges for performing WebDAV methods instead of the standard privileges in the WebDAV Access Control Protocol. In addition, we present the facility for detecting conflicts between new access privileges on resources and old access privileges on them. We applied the method-based access control management technique to the CoSlide collaborative system. The developed access control manager enables us to create group workspaces with flexible access control strategies for group members and resources.

• Proceedings of the Korean Information Science Society Conference
• /
• 2005.11a
• /
• pp.184-186
• /
• 2005

본 논문은 시간 제약 조건을 갖는 컨텍스트(상황)에 대한 분산적 탐지 기법(PROCON)을 제안한다. 수집한 데이터를 베이스 스테이션으로 모아 컨텍스트의 발생 여부를 결정하는 기존의 중앙집중 기법과 달리 PROCON은 네트워크 내에서 능동적, 분산적 방식으로 센서 노드 간의 협업을 통하여 컨텍스트를 결정한다. 따라서, 컨텍스트의 발생여부 탐지와 이에 대한 대응(Actuation)이 베이스 스테이션에 독립적으로 네트워크 내에서 모두 이루어진다. 본 논문은 다양한 상황구성에 대한 시뮬레이션을 통해 PROCON의 분산 상황방식이 기존의 중앙집중 방식에 비해 상당한 에너지 절약과 서비스 신뢰성(reliability) 향상을 가져온다는 것을 보인다.