• Proceedings of the Korea Information Processing Society Conference
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• 2011.04a
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• pp.146-148
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• 2011

홈 네트워크 분야는 현재 유무선 통신과 디지털 정보 기기를 기반으로 지능화 된 주거 공간을 제공하고자 하는 스마트 홈 연구가 활발하게 진행 중이다. 최근 사용자에게 더 편리하고 실용적인 스마트 홈 서비스를 어떻게 제공할 것인가에 대한 이슈가 대두되고 있다. 본 논문에서는 이를 위해 범용성, 유용성, 편의성을 고려한 서비스에 대해 연구하였다. 플랫폼 독립적인 웹서비스를 기반으로 홈 내 자원에 대한 기본 정보을 제공하고, 자원 사이의 관계 상황을 찾아 새로운 관계 정보를 제공한다. 이를 활용하여 사용자 편의적인 인터페이스를 가진 모바일 응용 프로그램을 개발하였다. 향후 장애 정보와 결합하여 홈 내 유지보수 서비스로의 확장을 기대한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.39C no.6
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• pp.466-475
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• 2014

The IVEF service is the draft standard designed for exchange of information on sea traffic between the vessel traffic systems and between the vessels. Standardization of this service is under way as a part of the next-generation navigation system, called e-Navigation. The International Association of Lighthouse Authorities (IALA) suggests, on its recommendation V-145, the IVEF service model and the protocol for provisioning of this service. But the detailed configuration of this service must be designed by the users. This study suggests, based on the basic service model and protocol provided in the recommendation V-145, the implementation of the J-VTS middleware which will facilitate exchange of information on sea traffic. The J-VTS middleware consists of various components for providing the IVEF service and for processing the IVEF message protocols. The vessel traffic systems and the vessels corresponding to upper-layer applications may use the IVEF service with the functions provided by the J-VTS middleware, and the services are designed to be accessed according to the security level of users.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.2
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• pp.488-494
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• 2013

For the activeness and autonomy of a sensor network, the efficient migration method of a mobile agent and the consistent naming services are the required components of a sensor network. Accordingly, this paper presented the implementation of backward migration of an active rule mobile agent applying the naming method based on RMI that used the meta_table including the informations about the components of a sensor network. This study implemented based on the extension of the forward migration[12], and the results of the various experiments present the efficacy of mobile agent middleware system and the possibility of constructing efficient sensor network application environment. And, the results of this study are able to enhance the adaptability on dynamic changes of environment in sensor network application development.

• Spatial Information Research
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• v.18 no.4
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• pp.75-88
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• 2010

Recent development in wireless communication and mobile positioning technologies make geosensor networks widely used in the various fields of real world. As a result, much research has been done on the middleware that uses limited energy resources efficiently. However, because traditional middleware does not consider the characteristics of sensor node, such as computing power and specification, the existing middleware call not support the sensor nodes with only the restricted system resource. Therefore, in this paper, we design and implement a new Bytecode based Data Service Middleware supporting energy efficiency in geosensor networks. At first, the proposed middleware provides the optimized functions for sensor nodes by using minimum by tee ode instruction set and data manager supporting hardware abstraction. Secondly, the proposed middleware increases the energy efficiency of sensor node through both data aggregation query processing and data filtering that minimize data transmission by eliminating unnecessary data. Finally, we show from our performance analysis that the proposed middleware is more energy efficient than the existing SwissQM.

• Spatial Information Research
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• v.12 no.2
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• pp.165-179
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• 2004

With the spread of wireless internet, the interest in mobile applications and services is increasing. Korea Wireless Internet Standardization Forum has been establishing the standards for mobile platform and map service in the wireless internet environment. This study aims to present a paragon of mapping middleware that plays the role of broker for wireless internet map service: in particular, it focuses on the interoperability with generic map servers. In this study, we developed a method for applying current map servers to the wireless internet map service, and analyzed the request/response structure of the map servers which have different operation characteristics in order to allow our middleware to fully utilize the functionalities of the map servers. The middleware we developed is composed of .NET-based XML Web Services: it has a lightweight module for image map and a map representation module for choropleth map, symbol map, chart map, etc. This mapping middleware is a broker between mobile client and generic map server, and supports .NET clients and Java clients as well. Its component-based interoperability grants the extensibility for the wireless internet dedicated map servers of the future in addition to the current generic map servers.

• The Journal of the Korea Contents Association
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• v.8 no.5
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• pp.19-28
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• 2008

In this paper, we implemented an intelligent home service robot system which alerts users to danger by wireless internet platforms for interoperability(WIPI) of a cellular phone. This paper discusses the three parts of the system: robot, middleware and mobile system. First, the robot consists of a gas sensor, a fire detector, ultrasonic sensors, motors, a camera and a Bluetooth module. The robot perceives various danger circumstances. Second, the middleware connects the robot and the mobile system. It monitors the robot and sends emergency notification SMS message to the user's cellular phone if in danger. Third, the mobile system sends commands which control the robot using TCP/IP protocol. The proposed scheme is to control the sensors of the robot part through Atmega 128 processor, and the robot and middleware parts will be installed in the household, and will be controled by mobile part from the outside.

• Proceedings of the Korea Institutes of Information Security and Cryptology Conference
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• 2006.06a
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• pp.97-100
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• 2006

본 논문에서는 유비쿼터스 환경에서 네트워크와 이동단말, 서비스 보안관리 연구를 진행하는데 도움이 되고자 이러한 보안관리를 통합적으로 할 수 있는 미들웨어을 만들게 되었으며 플러그인 형태로 무한한 확장성을 포함하여 정보 수집에서 분석, 정책 설정 및 관리, 위치정보 등의 다양한 기능을 제공한다. 또한 도메인 서버간에 협동을 통해 이동단말의 이동에 대한 다양한 보안관리 연구가 가능하도록 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.278-279
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• 2012

본 논문에선 개방형 모바일 클라우드 서비스를 위한 Home App과 Repository App을 OMC Home App 생성 마법사를 통해 쉽고 효율적이고 사용자 기호에 맞게 개발할 수 있는 Home App Template과 Repository App Template을 제안한다.

• Journal of Communications and Networks
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• v.4 no.4
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• pp.336-343
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• 2002

A major challenge for next generation mobile communication is capturing the system architecture’s complexity with all its internal and external dependencies. Seamless integration of heterogeneous environments in all system parts is a key requirement. Moreover, future systems have to consider the different evolution cycles of individual system parts. Among those, services are expected to change the fastest. With respect to these considerations, we propose an overall architecture for next generation mobile communication systems. It covers all system parts from wireless transmission to applications including network and middleware platform. Our approach focuses on adaptability in terms of recon- figurability and programmability to support unanticipated system evolution. Therefore, we consider abstraction layers which consist of adaptable cooperating components grouped by open platforms rather than rigid system layers. In addition to that, we introduce cross-layer cooperation allowing an efficient use of the available resources. Specific scenarios illustrate the feasibility of our approach.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.2
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• pp.247-262
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• 1999

이동 컴퓨팅 환경의 특징은 대역폭의 제약과 잦은 접속의 단절이다. 앞으로 이동 컴퓨팅에 대한 요구는 증가할 것이며 이동 컴퓨팅 환경을 극복할 수 있고 동적으로 적응할 수 있는 서비스를 필요로 한다. RPC(Remote Procedure Call)는 동기적이며 믈록(block)상태를 유발시키는 통신 구조로 분산 응용 프로그램을 작성하기 위한 환경을 제공한다. M-RPC(Mobile RPC) 는 RPC를 이동 컴퓨팅 환경에 맞도록 확장한 것이다. MOM(Message Oriented Middleware)은 분산 통신을 위한 미들웨어로서 분산 프로세스들간에 동기적 또는 비동기적 상호 작용을 지원하는 peer-to-peer 분산 컴퓨팅 모형으로 특징지워진다. 본 논문은 기존 MOM 시스템을 기반으로 하여 이동 컴퓨팅 환경을 지원하는 M-MOM(Mobile-MOM) 시스템을 제안하고 자바 언어로 구현하여 성능을 평가한다. M-MOM 환경에서 이동 호스트(mobile host)에서 실행되는 응용 프로그램과 고정 호스트(fixed host)에서 실행되는 메시지 큐 관리자는 베이스 스테이션(Base Station)에서 실행되는 메시지 에이전트를 통해 메시지 큐 관리자와 동적으로 연결된다. 비동기적인 서비스를 지원하는 M-MOM은 동기적인 서비스만을 지원하는 M-RPC 보다 이동 컴퓨팅 환경을 보다 효과적으로 극복할 수 있는 서비스를 지원한다.