• Journal of the Korean Institute of Telematics and Electronics C
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• v.35C no.3
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• pp.59-68
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• 1998

This paper propose a hardware architecure of multimediasysgem for integrated processing of the multimedia data such as audio and video, and describes on the design and implementation of multimedia integrated processing Unit. The unit comprises most commonly needed multimedia processing function for computer-based video conference: audio-visual datacapture, playback, compression, decompression as well as interleaving/disinterleaving of compressed audio-visual data. The proposed architecture minimizes the CPU overhead that might be caused by multimedia data processing and assures the fluent data flow among system components. Also, this unit is tested and analyzed under the computer-based video conference to confirm the multimedia unit of proposed architecture using communication protocol and application software through Ethernet and FDDI (Fiber Distributed Data Interface) networks.

• IEMEK Journal of Embedded Systems and Applications
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• v.5 no.1
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• pp.23-28
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• 2010

The automotive industry tries to provide infotainment systems to emerging automobiles. Since the infotainment systems require various peripheral devices and network connectivity, legacy operating systems such as Linux and Windows can be much preferred due to its plentiful device drivers and multimedia applications while the operating systems following OSEK standard are used for automotive electronic control units. Thus it is highly desired that the system software supporting infotainment applications can be portable over different legacy operating systems providing unified programming interfaces. The majority of legacy operating systems support POSIX interfaces for application development. MOST is an automotive network standard for infotainment systems. Network Service defines the protocol stacks for MOST control data, which is essential to implement infotainment applications over MOST. In this paper, we suggest a POSIX-based Network Service so that we can utilize legacy device drivers and applications for automotive infotainment systems. We measure the performance of the POSIX-based Network Service and show that its overhead is not significant.

• Korean Journal of Computational Design and Engineering
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• v.7 no.3
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• pp.170-176
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• 2002

To exchange CAD data between heterogeneous CAD systems, we generally use a neutral format especially STEP, which is the international standard (ISO-10303) for product model data exchange. AP214 (Application Protocol) for the automotive industry not only takes into account geometry and organizational data, but also provides a classification mechanism for product modeling. When reading a STEP file during a design process that is exported from other CAD systems, it is a burden to a designer to go through the tedious process of removing duplicate or non-manifold entities, adjusting parts, and rearranging text. We analyze the structure of AP214 and develop a healing tool to solve the following problem. Without the assembly information in the Master workspace of CATIA, or to read a STEP file from Pro/Engineer, a designer should do a repetitive process of disintegrating an assembly into parts one by one. We have developed a post-processing tool for STEP AP214 that separates out a part from an assembly model and adjusts superfluous or useless entities using the ACIS kernel.

• Journal of the Society of Naval Architects of Korea
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• v.47 no.6
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• pp.836-842
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• 2010

Safety system including location monitoring system for blasting workers was studied. Positioning performance of the location monitoring system was highly dependent on communication protocol and the number of access points in the blasting cell. RTLS(Real Time Location System) is an important technology to develop the location information of workers and variously used to enhance workers safety. Location monitoring system with Cell-ID and RSSI wireless communication technology was verified to have a proper positioning performance for the steel block application.

• Journal of the military operations research society of Korea
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• v.23 no.1
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• pp.100-114
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• 1997

The network for proving information exchange function in distributed system is interconnected among other networks which are in the state of independent construction and operation. However, due to various network protocols and distributed applications, Problems occurred in the area of network interconnectivity and interoperability of distributed applications in internetworking which should provide a good interoperability. This paper proposed an improved method for finding route which has the highest interworkability between end-systems using the interrelationship of network protocol. An algorithm and method of constructing a virtual network which is suitable for required distributed application are also proposed in this research.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2329-2331
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• 2001

In this paper, were developed the 3 axes attitude control sensor system to control and monitoring the moving object. The proposed sensor system has been studied in Japan, America for a year ago. But it is high expensive and has a difficulty in application. To overcome these problems, proposed the 3 axes attitude control sensor system is low cost and easily applied. Proposed sensor system is equipped with the 3 gyro sensors, 2 tilt sensors and 3 MR sensors using 80C51 microprocessor for signal processing. It's output value transmit at long distance using RS232 serial communication protocol. We expect this system shall have a good performances in many applications of control and monitoring the moving object.

• The Journal of Information Technology and Database
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• v.7 no.1
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• pp.17-26
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• 2000

To provide highly available services in the distributed object system, it is required to support the object group. The state machine approach and primary-backup approach are proposed as two representative approaches for support of object group. The primary-backup approach does not only give merits such as transparency of object group and non-deterministic execution but also require less resource than state machine approach. This paper describes an extension of CORBA that is required to support of the primary-backup object group. In this paper, the state of backup is synchronized with primary through the atomic multicast protocol whenever the request of client is executed at primary. As a result, it does not require message logging and check pointing. The object group of this paper also provides fast response time in case of failure of the primary since it makes primary election unnecessary. And through an extension of IDL, it makes possible to avoid consistency control depending on characteristic of application. A prototype has been implemented and the performance of object group has been compared with a single object invocation.

• Journal of KIISE:Computing Practices and Letters
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• v.5 no.3
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• pp.336-343
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• 1999

본 논문은 지능형 정보 제공 시스템(IP : Intelligent Peripheral)의 주요 소프트웨어 블록 중 하나인 자원 서비스 제어부의 구현 방법을 설명한 것이다. 본 연구의 자원 서비스 제어부는 ITU-T INCS-1에 정의된 특수자원 기능실체(SRF : Specialized Resource Function)의 상태모델을 실현시킨 소프트웨어 블록으로서 IP 하드웨어 구성요소의 하나인 특수자원교환기(SRS : Specialized Resource Switch) 의 CROS(Concurrent Realtime perating System)상에서 CHILL(CCITT High Level Programming Language)로 구현되었으며, 지능망서비스제어시스템(SCP : Service Control Point)이 보낸 지능망 응용프로토콜(INAP : Intelligent Network Application Protocol)오퍼레이션을 분석하여 IP가 보유한 자원 구동에 필요한 모든 절차를 제어한다. 또한 동시에 수신된 INAP오퍼레이션들에 대한 순서제어기능, 통계데이타 제공기능, 사용자 상호작용 종료 기능등을 제공한다. 제안된 구현기술은 자원서비스 제어부가 실제 자원을 동작시키는 IP 하드웨어 구성요소인 특수자원유닛(SRU : Specialized Resource Unit)을 클라이언트/서버형태로 유지하여 이들 자원의 상태를 관리함으로써 IP의 확장성을 보잔하여, 교환기 실시간 데이터베이스를 이용하여 IP가 생성하는 수만여개의 메시지를 효율적으로 관리할 수있다.

• Proceedings of the KIEE Conference
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• 2003.07d
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• pp.2254-2258
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• 2003

In recent years, the case to install small water treatment facility to every local area has increased. A key issue in the successful implementation of the control systems for the water treatment plants is the choice of control architecture. Within the framework of distributed control system(DCS), this paper presents a new development of intelligent control module and its novel application to open control architecture for water treatment plants. This control system so called NCS(Network Based Control System) with standard networks system with LonTalks protocol of ANSI/EIA 709.1, regulatory control function and information dispatch function has suitable functionality to operate these distributed water treatment facility effectively. This paper describes the case where NCS is applied for the filters system in water treatment facility of Heong Sung area.

• The Transactions of the Korea Information Processing Society
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• v.5 no.3
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• pp.741-750
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• 1998

본 논문에서는 형식 기법을 이용하여 차세대 지능망 응용 프로토콜(INAP:Intelligent Network Application Protocool)적합성 시험 스위트를 생성하는 방법 및 IUT(Implenentation Under Test)시뮬레이터를 구축하여 시험을 수행함으로써 시험 스위트를 검증하는 방법에 관해 기술한다. SDL(Specification and Description Language)과 같은 형식 언어를 사용하여 INAP FSM(Finite State Machine)을 모델링하고 MSC(Message Sequence Chart)로 시험 목적을 기술한다. 기술된 FSM모델과 시험 목적을 검증하기 위해 모의 시험을 거치며, 검증이 완료된 후 시험 스위트로 변환이 된다. 형식 기법을 이용하여 INAP규격을 정확하게 기술할 수 있을 뿐 아니라 시험 스위트를 자동으로 생성함으로써 시간과 비용을 절감할 수 있다. 또한 생성된 시험 스위트를 시험기에 탑재하여 IUT시뮬레이터를 대상으로 시험을 수행함으로써 시험 스위트를 검증할 수 있는 방안을 제시하였다.