• 생약학회지
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• 제48권2호
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• pp.125-133
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• 2017

In this study, we investigated the total phenolic and flavonoid contents, component analysis, antioxidative activity and cellular protective effects against oxidative stress on human skin cells in 50% ethanol extract, ethyl acetate fraction and aglycone fraction obtained from Gynostemma pentaphyllum (G. pentaphyllum) Makino. The DPPH (1,1-diphenyl-2-picrylhydrazyl) scavenging activites ($FSC_{50}$) of the 50% ethanol extracts, ethyl acetate fraction and aglycone fraction were 246.8, 147.2, $128.9{\mu}g/mL$, respectively. Reactive oxygen species (ROS) scavenging activities ($OSC_{50}$) of the 50% ethanol extract, ethyl acetate fraction and aglycone fraction on ROS generated in $Fe^{3+}-EDTA/H_2O_2$ system using the luminol-dependent chemiluminescence assay were 37.15, 10.74, $7.19{\mu}g/mL$, respectively. We investigated the cellular protective activity and the results showed that treatment of aglycone fraction ($0.05-0.39{\mu}g/mL$) protect human skin cells in a concentration-dependent manner when the skin cell damages were induced by treating them with $H_2O_2$. These results suggest that extract/fractions of G. pentaphyllum Makino may be applicable as natural antioxidants in cosmetics.

• 한국정보컨버전스학회논문지
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• 제5권2호
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• pp.67-76
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• 2012

XML 기반의 오픈 프로토콜인 XMPP는 사용자가 다른 사용자에게 메시지를 전달할 수 있음을 의미하는 분산화 된 통신 네트워크이자 이를 가능하게 하는 네트워크 인프라라고 할 수 있다. 또한, XMPP 서버는 전문 서버 투 서버 프로토콜을 사용하여 서로 통신할 수 있으며, 분산화 된 소셜 네트워크와 협업 프레임워크에 중요한 가능성을 제공한다. 따라서 본 논문에서는 XMPP 메시지 프로토콜의 특징을 차량용 텔레매틱스 단말기에 적용 가능한 XMPP 기반 플랫폼을 설계하고, 양방향 통신을 위한 지점의 프레전스 문제, 지점 간 세션 설정 문제, 보안문제, 호환성 문제, 확장성 문제를 해결하기 위한 XMPP 기반 메시징 시스템을 구현하였다.

• 산업공학
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• 제25권1호
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• pp.40-51
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• 2012

Today, many manufacturing companies realize that collaboration is crucial for their survival. Especially, in the perspective of quality, the importance of collaboration is emphasized because economic loss increases exponentially while defective parts go through the process in supply chain. However, the manufacturing companies are facing two main difficulties in implementing collaborative relationships with their suppliers. First, it is difficult for the suppliers to produce reliable products due to their obsolete facilities. The problem gets worse for second- or third-tire vendors. Second, the companies experience the lack of universally understandable set of terminology and effective methodologies for knowledge representation. Ontology is one of the best approaches to expressing and processing a domain knowledge. In this paper, we propose the manufacturing ontology-based quality prediction framework to represent and share the knowledge of industrial environment and to predict product quality in manufacturing processes. In addition, we develop the ontology-based quality prediction system based on the proposed framework. We carried out a series of experiments for an injection molding process at an automotive part supplier. The experimental results demonstrated that the proposed framework and system can be successfully applicable in manufacturing industry.

• 한국경영과학회지
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• 제24권4호
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• pp.157-170
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• 1999

The web-based groupware systems hold many possibilities for system developers and users. Especially, web-based group collaborative systems are emerging as enterprise-wide information systems. Since data in group collaborative systems are apt to be shared among multiple concurrent users and modified simutaneously by them, the web-based group collaborative systems must support synchronous collaboration in order to provide users with synchronized and consistent views of shared data. However, current web technologies have limitations in supporting this, largely because the existing Hypertext Transfer Protocol(HTTP) is unidirectional and does not allow web servers to send messages to their web browsers without first receiving requests from them. This paper proposes an active web server that can overcome such limitations and facilitate synchronous collaboration in web-based group collaborative systems. To accomplish such goals, the active web server manages dependency relationships beween shared data and web browsers referencing them and actively propagates changing details of the shared data to all web browsers referencing them. And, this paper examines usefulness and effectiveness of the active web server to apply it to the ball-bearing design example of concurrent engineering design systems. The prototype system of the active web server is developed on a commercial Object-oriented Database Management System(0DBMS) called OBJECTSTERE using the C++ programming language.

• 한국위성정보통신학회논문지
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• 제12권1호
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• pp.137-142
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• 2017

본 논문에서는 제안 플랫폼를 통하여 구매한 복권 콘텐츠를 보안 스토리지에 등록하면 스마트폰, 기존 복권 단말기 등에서 콘텐츠를 공통의 경험으로 사용할 수 있는 모바일 웨이저링 플랫폼 기술을 제안한다. 현재 많은 사람들이 다양한 유형의 복권 콘텐츠를 대량으로 생산 및 소비하고 있는데, 향후에는 IoT(사물인터넷) 기술이 확대되면서 실시간 콘텐츠와 과거 콘텐츠가 함께 공존할 것으로 예상된다. 따라서 복권 콘텐츠 및 협업 시스템에서 해외 복권 서비스 제공 업체와 경쟁할 수 있는 차별화된 서비스를 개발하여 새로운 시장을 창출할 필요가 있다. 이에 본 연구에서는 모바일기기를 사용하여 양질의 복권 콘텐츠를 기반으로 클라우드 시장을 선점하기 위한 복권콘텐츠 협업서비스 플랫폼을 제안 한다.

• 한국정보처리학회논문지
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• 제5권5호
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• pp.1234-1245
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• 1998

본 논문에서는, 이형질의 분산된 소프트웨어 시스템들의 연동을 위해 각 시스템을 담당하는 에이전트들을 할당하고 블랙보드 구조를 이용하여 그들간의 협력을 제공하는 시스템을 제안하였다. 이 시스템을 분산 컴퓨팅 환경의 하나인 멀티미디어 원격교육 시스템에서 이미 개발되어 있는, 특성이 서로 다른, 소프트웨어 서브 시스템들의 연동을 지원하는데 적용하였다. 각 에이전트들에 대한 메타지식을 제어기에 분리 시킴과 더불어, 제어 지식과 문제해결 지식을 명확히 분리하여 분산, 협조형 문제해결의 기존 시스템들이 찾는 문제점을 개선하고 기존의 소프트웨어 시스템들의 재사용성을 높였다.

• Industrial Engineering and Management Systems
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• 제9권3호
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• pp.275-284
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• 2010

Offshore software development (OSD) is international business collaboration. OSD projects often encounter intercultural and inter-linguistic problems disturbing the projects. Business documents are formal media of information and knowledge for OSD. While OSD documents should convey common understanding of the OSD products, the documents may contain unsuitable expressions which draw misunderstanding of the required products and offensive issues for the collaboration. Intercultural and inter-linguistic differences cause mistakes and inappropriate expressions. OSD from Japan to China is the largest in Asia, and Japanese language is often used in OSD documents. Large similarity is found between Japanese and Chinese in their languages, while many differences exist even for the same word. The similarity induces to write unsuitable expressions for both sides of OSD. To introduce risks for OSD projects caused by unsuitable or inappropriate expressions in OSD documents, we propose to apply a proofreading system of Japanese documents for OSD. Japanese consignor uses the system to refine OSD documents written by Japanese engineers for Chinese readers, and Chinese consignee uses it to refine Japanese documents written by Chinese Engineers as derivatives of OSD projects. Effectiveness of applying the proofreading system is discussed for actual projects.

• 한국컴퓨터정보학회논문지
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• 제24권7호
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• pp.125-133
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• 2019

Because military weapons systems for special purposes are small and complex, they are not easy to maintain. Therefore, it is very important to maintain combat strength through quick maintenance in the event of a breakdown. In particular, naval ships are complex weapon systems equipped with various equipment, so other equipment must be considered for maintenance in the event of equipment failure, so that skilled maintenance personnel have a great influence on rapid maintenance. Therefore, in this paper, we analyzed maintenance data of defense equipment maintenance information system through text mining and social network analysis(SNA), and tried to identify the naval ship maintenance expertise. The defense equipment maintenance information system is a system that manages military equipment efficiently. In this study, the data(2,538cases) of some naval ship maintenance teams were analyzed. In detail, we examined the contents of main maintenance and maintenance personnel through text mining(word cloud, word network). Next, social network analysis(collaboration analysis, centrality analysis) was used to confirm the collaboration relationship between maintenance personnel and maintenance expertise. Finally, we compare the results of text mining and social network analysis(SNA) to find out appropriate methods for finding and finding naval ship maintenance expertise.

• 한국정밀공학회지
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• 제20권9호
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• pp.142-150
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• 2003

MDO is one of the efficient methods for huge and multi -functional system design. This paper describes a design collaboration framework with MDO in networked design environment. A prototype of web -based integrated design system was implemented to show sharing and exchange of models and analysis information between MDO modules and collaborative design stations. Server System consists of MDO modules for optimization and modeling module for 3D modeling operation. Client system provide user with graphic interface for shape modeling and system operation. We believe that the proposed approach can be extended to solve real complex multidisciplinary design problems.

• 한국시뮬레이션학회논문지
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• 제10권1호
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• pp.83-92
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• 2001

For the prevention of the network intrusion from damaging the system, both IDS (Intrusion Detection System) and Firewall are frequently applied. The collaboration of IDS and Firewall efficiently protects the network because of making up for the weak points in the each demerit. A model has been constructed based on the DEVS (Discrete Event system Specification) formalism for the simulation of the system that consists of IDS and Firewall. With this model we can simulation whether the intrusion detection, which is a core function of IDS, is effectively done under various different conditions. As intrusions become more sophisticated, it is beyond the scope of any one IDS to deal with them. Thus we placed multiple IDS agents in the network where the information helpful for detecting the intrusions is shared among these agents to cope effectively with attackers. If an agent detects intrusions, it transfers attacker's information to a Firewall. Using this mechanism attacker's packets detected by IDS can be prevented from damaging the network.