• The KIPS Transactions:PartA
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• v.18A no.5
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• pp.181-192
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• 2011

Information superiority is an essential factor in modern warfare and it can be archived by efficient information exchange between systems. Various computing systems are installed on the today's navy vessels. However, it is hard to improve interoperability and efficiency of information exchange since the configurations of installed systems are varying. The military standard and commercial standard are mix-used between systems. In this paper, we propose an information exchange architecture based on Pub/Sub model as a communication middleware to improve interoperability as well as enhancing scalability. We also propose a novel tree matching algorithm to improve a performance of PubSub broker. In the proposed algorithm, each tree nodes have information about predicates of subscription that can reduce event matching time. The performance evaluation results show our proposed algorithm reduces time for matching predicates compare with other algorithms.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.11
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• pp.2119-2124
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• 2016

The Internet of things (IoT) needs to be an event-driven approach for efficient related time response and processing. The growth of mobile devices in Internet of Things (IoT) leads to a number of intelligent buildings related IoT applications. For instance, home automation controlling system uses client system such web apps on smartphone or web service to access the home server by sending control commands. The gateway based RESTful technology responsible for handling clients'requests attests an internet latency in case a large number of clients' requests submit toward the gateway increases. In this paper, we propose the design tasks of the IoT gateway for handling concurrency events. The gateway based event-driven architecture is designed for building IoT gateway using node.js on one side and communication protocol based message-oriented middleware known as XMPP to handle communications of intelligent building control devices connected to the gateway through a centralized hub.

• Proceedings of the Korea Information Processing Society Conference
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• 2006.05a
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• pp.19-22
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• 2006

최근 들어, 모든 장소에 컴퓨터가 있고 그것을 누구나 자유롭게 사용할 수 있는 인간 중심 유비쿼터스 환경에 대한 연구가 활발하게 진행되고 있다. 그러나 이러한 컴퓨팅 환경에서의 센서 미들웨어들은 연속적인 스트림 데이터 처리에 대한 막대한 비용을 줄이기 위해서 분석이 끝난 스트림 데이터를 삭제한다. 따라서 사용자의 서비스에 삭제된 스트림 데이터가 요구될 경우, 또는 과거 데이터들에 대한 확률 통계 정보가 요구될 경우, 이에 대한 서비스를 사용자에게 제공할 수 없다. 본 논문에서는 이러한 미들웨어에서의 스트림 데이터 재사용 문제를 해결하기 위해서 스냅샷을 가지는 다중 레벨 공간 DBMS를 기반으로 하는 효율적인 센서 데이터 미들웨어 구조를 설계하였다. 본 시스템은 사용자에게 재사용될 가치가 높은 스트림 데이터들을 다중 레벨 공간 DBMS 의 디스크 데이터베이스에서 관리한다. 또한 빈번한 서비스를 가지는 스트림 데이터의 경우 해당 스트림 데이터를 메모리 데이터베이스에 관리함으로서 사용자에게 신속한 서비스를 제공한다. 본 시스템은 기존의 미들웨어에서 지원할 수 없었던 동일한 스트림 데이터에 대한 빈번한 요청, 또는 확률이나 통계 자료와 같은 데이터 서비스 요청 문제들을 해결하였다. 그리고 메인 메모리 데이터베이스에 스냅샷 형태로 저장되는 스트림 데이터의 높은 데이터 재사용성을 유지함으로서, 사용자에게 지속적으로 정확하고 신속한 데이터 서비스를 제공한다.

• Journal of the Society of Naval Architects of Korea
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• v.42 no.4 s.142
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• pp.411-420
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• 2005

World leading company and research centers have invested much cost and effort into a PLM and digital manufacturing field to obtain their own competitiveness. We have been trying to apply a digital manufacturing, especially simulation to ship production process as a part of PLM implementation for a shipyard. A shipbuilding production system and processes have a complexity and a peculiarity different from other kinds of production systems. So, new analysis and modeling methodology is required to implement digital shipyard. which is a digital manufacturing system for a shipbuilding company. This paper suggests an analysis and simulation modeling methodologies for an implementation of a digital shipyard. New methodologies such as a database-merged simulation, a distributed simulation, a modular simulation with a model library and a 3-tire simulation framework are developed.

• The KIPS Transactions:PartC
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• v.13C no.5 s.108
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• pp.549-558
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• 2006

For activating home network, the security service is positively necessary and especially the access control supports secure home network services and differentiated services. But, the existing security technology for home network seldom consider access control or has a architecture to be dependent on specific middleware. Therefore, in this paper we propose a scheme to support integrated access control in home network to use XACML, access control standard of next generation, to have compatability and extensibility and we design and implement XACML access control system based on this. we also had m access control experiment about various policy to connect developed XACML access control system with the UPnP proxy based on OSGi in order to verify compatability with existing home network system.

• Journal of information and communication convergence engineering
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• v.3 no.3
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• pp.157-162
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• 2005

Web services are key applications in business­to-business, business-to-customer, and enterprise applications integration solutions. As the mobile internet becomes one of the main methods for information delivery, mobile Web Services are regarded as a critical aspect of e-business architecture. In this paper, we proposed a mobile Web Services middleware that converts conventional internet services into mobile Web services. We implemented a WSDL (Web Service Description Language) builder that converts HTML/XML into WSDL and a SAOP (Simple Object Access Protocol) message processor that performs SOAP message handling, chain and handling of server requests. The former minimizes the overhead cost of rebuilding mobile Web Services and enables seamless services between wired and wireless internet services. The latter enhances SOAP processing performance by eliminating the Servlet container (Tomcat), a required component of typical Web services implementation. Our main contributions are to overcome the latency problem of current Web Services and to provide an easy mobile Web service implementation. Our system can completely support standard Web Services protocol, minimizing communication overhead, message processing time, and server overload. Finally we compare our empirical results with those of typical Web Services.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.7 no.4
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• pp.750-757
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• 2003

Many issues about portability and extension of system converting and exchanging information using XML standard data are being studied currently. This paper proposes design using XML processing layer for mediation between client and server to solve the development cost problem for compatibility and extension of client/server environment. This maintains mediation role for programming development between client and server and increases extension of system and portability of hetero geneous environment. This paper implements and designs XML data processing system for EC using XML DB among hetrogeneous databases. We expect cost-down by maintenance of system using this architecture for electronic commerce.

• Proceedings of the Korea Contents Association Conference
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• 2009.05a
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• pp.845-850
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• 2009

To support distributed environment that is independent and standardized between heterogeneous system, a study on the TAO(The ACE ORB) communication middleware based on the RT-CORBA is highly being done. The TAO supports real-time features not on the general purpose operating system like Windows or Linux but on the real time operating system like Vxworks or LynxOS. In this paper, we build and construct environment that supports a thread-level real time feature by porting the TAO on VxWorks target. Also we validate the ported TAO by network communication with the TAO of Windows.

• Spatial Information Research
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• v.18 no.1
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• pp.101-107
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• 2010

Context-aware technologies have become the one of core technologies for intelligent urban geospatial services in ubiquitous computing environment. To provide context-aware intelligent services, various technologies including for context-aware modelling, context-aware sensing and context-aware service middleware are required. Among them, especially, ontologies are very useful for modelling, interpreting and reasoning context informations across various domains. In this research, the recent trends of context-awareness technologies and ontologies are reviewed to build a conceptual architecture for intelligent urban geospatial services. Considering it, the strategies of intelligent urban geospatial services are proposed.

• Proceedings of the Korea Information Processing Society Conference
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• 2005.05a
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• pp.1371-1374
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• 2005

유비쿼터스 컴퓨팅 환경의 인프라는 센서, 미들웨어, 그리고 응용 프로그램으로 구성된다. 유비쿼스터 컴퓨팅 환경이 실현되기 위해서는 이 세 요소들은 상호 유기적으로 메시지를 전달해야 한다. 특히 센서와 미들웨어간의 통신은 이 점에서 중요한 역할을 한다. 본 논문에서는 센서와 미들웨어간의 통신 메커니즘을 지원하는 아키텍쳐를 제안한다. 기존의 시스템에서는 센서와 미들웨어 사이에서 통신 기능을 담당하는 컴포넌트는 데이터와 이를 처리하는 기능이 함께 존재했다. 그렇기 때문에 데이터를 처리 기능이 같을지라도 받아 들이는 데이터가 다르고 처리하는 정보가 다르다면 센서 수와 같은 컴포넌트가 존재해야 한다. 또한 센서와 미들웨어간의 통신 기능을 담당하는 컴포넌트를 만들기 위해서는 미들웨어와 센서에서 제공하는 API 를 이용하여 개발자가 직접 코딩작업을 해야 한다. 이럴 경우 개발자의 시간과 노력이 많이 필요로 한다. 두 문제점을 해결하기 위하여 먼저 데이터와 이 데이터를 처리하는 부분을 분리시킨다. 이러한 메커니즘은 SNMP 에서 도입하였다. SNMP 를 구성하는 요소 중에서 자료를 처리하는 부분은 에이전트가 맡고, 자료를 저장하는 부분은 MIB 이 맡는다. 그 결과 해당 컴포넌트의 재사용이 가능하게 된다. 또한 MIB 과 에이전트의 개발 시간을 단축하기 위해서 SNMP 를 이용한 툴킷을 이용한다. 이렇게 함으로써 센서측과 미들웨어 사이에 통신하는 컴포넌트를 개발하는 시간과 개발자의 노력의 효율성을 증대 시킬 수 있다.