• 한국전산유체공학회:학술대회논문집
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• 2011.05a
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• pp.343-349
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• 2011

A loosely coupling method is adopted to combine a computational fluid dynamics (CFD) solver and the comprehensive structural dynamics (CSD) code, CAMRAD II, in a systematic manner to correlate the airloads, vortex trajectories, blade motions, and structural loads of the HART I rotor in descending flight condition. A three-dimensional compressible Navier-Stokes solver, KFLOW, using chimera overlapped grids has been used to simulate unsteady flow phenomena over helicopter rotor blades. The number of grids used in the CFD computation is about 24 million for the isolated rotor and about 37.6 million for the rotor-fuselage configuration while keeping the background grid spacing identical as 10% blade chord length. The prediction of blade airloads is compared with the experimental data. The current method predicts reasonably well the BVI phenomena of blade airloads. The vortices generated from the fuselage have an influence on airloads in the 1st and 4th quadrants of rotor disk. It appeared that presence of the pylon cylinder resulted in complex turbulent flow field behind the hub center.

• Journal of Information Technology Applications and Management
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• v.12 no.2
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• pp.129-143
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• 2005

In recent years, two major streams in medical information systems are：1) system integration among OCS(Order Communication System), EMR(Electronic Medical Record), PACS(Picture Archiving and Communication System), and ERP(Enterprise Resource Planning) and 2) system integration through medical collaboration between East and West medical service providers. One of the characteristics which differentiate the Korean medical industry from the western medical industry is the East-West medical collaboration. In many respects there are many differences between East and West medical treatment. Although East and West medical treatment have developed from different medical philosophies and standards, we assume that the better medical care can be provided by integrating their medical procedures effectively. The two possible approaches to the integration of East and West medical information systems are suggested in this paper：One is loosely coupled model and the other is tightly coupled model. EMR improves the quality of medical record which reflects the quality of clinical practice. It provides more efficient and convenient way of input, retrieval, storage, communication and management of medical data. We abstracted the standard medical procedures from the two medical procedures performed in Daejeon Oriental Hospital and Hehwa Clinic at Daejeon University and also abstracted database schema by analyzing the characteristics of information needed in East-West medical collaboration. Our EMR is composed of two types of data：one is structured data and the other is unstructured data, which are formalized by SOAP(Subjective, Objective, Assessment, Plan) format. Currently the integrated system is implemented and operated successfully for six months.

• Proceedings of the Korean Information Science Society Conference
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• 2007.10b
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• pp.1-6
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• 2007

서열을 분석하고, 기능을 예측하는 서열 주해는 생명 현상 규명을 위한 필수 과정이다. 서열 주해는 다수 응용 프로그램간 상호 연계를 통한 복잡한 처리 과정을 거쳐 이루어진다. 현재 사용자는 다양한 응용 프로그램들 중 적합한 응용 프로그램을 선택한 후, 운영환경에 맞도록 설치하고, 사용법을 익혀야 한다. 또한 각 프로그램들의 연계를 위해 입출력 데이터 형식을 변환해야 하는 불편함이 있다. 이를 위해 자동화된 솔루션들이 개발되고 있지만, 각 단계별 프로그램들이 강결합(tightly coupled)되어 있어 유연성(flexibility)이 떨어지고, 기능의 확장 및 변경에 어려움이 있다. 본 논문에서는 기존 시스템들의 한계를 극복하기 위하여 SOA (Service Oriented Architecture) 기반의 서열 주해 시스템인 SeqWeB을 제안한다. SeqWeB은 서열 주해에 필요한 7개의 응용 프로그램(Phred, cross_match, RepeatMasker, ICAtools, Phrap, CAP3, Blast)들을 웹 서비스 기술을 통해 단위 서비스로 개발하고, BPM 기법을 이용하여 통합하였다. SeqWeB은 각 응용 프로그램간 상호 운용성을 높이기 위하여 XML 형식의 입/출력 데이터를 사용하며, SOA 기반의 시스템 통합으로 각 응용 프로그램들을 약결합(loosely coupled)하여 시스템의 확장 및 변경이 용이하다. 또한 웹을 기반으로 하는 다양한 조합의 서열 주해 솔루션 제공이 가능한 특징이 있다.

• Proceedings of the KIEE Conference
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• 2008.04a
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• pp.197-198
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• 2008

A software platform which is able to evaluate the performances of a GPS/INS integrated system has been developed in this paper. And it consists of four parts including GUI(Graphic User Interface) part, GPS part, INS part and integrated filter part. It basically offers the loosely, tightly and deeply coupled GPS/INS algorithms, and many design parameters can be changed by users via GUI. Each functions of the platform has been confirmed with GPS signals and IMU data from commercial simulators.

• 제어로봇시스템학회:학술대회논문집
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• 1997.10a
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• pp.744-747
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• 1997

High performance digital computer technology enables the digital computer-based controllers to replace traditional analog controllers used for factory automations. This replacement, however, brings up the side effects caused by discrete quantization and non-real-time execution of control softwares. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by real-time simulator make the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• Journal of Institute of Control, Robotics and Systems
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• v.5 no.1
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• pp.115-121
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• 1999

Advanced digital computer technology enables the computer-based controllers to replace the traditional analog controllers used in factory automations. This replacement, however, brings up the side effects caused by the quantization error and non-real-time execution of control software. This paper describes the structure of real-time simulator and controller that can be used for design and verification of real-time digital controllers. The virtual machine concept adopted by the proposed real-time simulator makes the proposed simulator be independent from the specific hardware platforms. The proposed system can also be used in the loosely coupled distributed environments connected through local area network using real-time message passing algorithm and virtual data table based on the shared memory mechanism.

• The Transactions of the Korean Institute of Power Electronics
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• v.21 no.4
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• pp.356-363
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• 2016

The design methodology of an adequate input voltage and magnetizing inductance to minimize reactive power is suggested to design a wireless power transfer (WPT) converter for high-power transfer efficiency. To increase the magnetizing inductance, the turn number of the WPT coil is increased, thus causing high parasitic resistance in the WPT coil. Moreover, the high coil resistance produces high conduction loss in the transfer and receive coils. Therefore, the analysis of conduction loss is used in the design of the WPT coil and the operating point of the WPT converter. To verify the proposed design methodology, the mathematical analysis of the conduction loss is presented by experimental results.

• The Transactions of the Korea Information Processing Society
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• v.3 no.4
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• pp.791-802
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• 1996

In this paper, we discuss a distributed shared memory management scheme based on multi-threaded programming model for a large-scale loosely coupled multiprocessor system. The scheme covers three major issues in the distribued shared memory;the address translation table management, the block coherence maintenance, and the block placement policy. The scheme efficiently resolves the general problems occurred in the distributed shared memory such as a false sharing, an unnecessary replication, a block bouncing, and an address aliasing phenomenon. It also provides the application transparency, good scalability, easy implementation, and multithreaded programming model to users.

• Proceedings of the KAIS Fall Conference
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• 2009.12a
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• pp.802-805
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• 2009

SOA는 특정 기술이나 플랫폼에 종속되지 않고 느슨한 결합(Loosely Coupled)을 가지고 상호 연동할 수 있는 서비스들의 조합으로 어플리케이션 개발을 가능하게 하는 정보시스템 아키텍처이다. 즉, 한덩어리의 방대한 코드로 이루어진 어플리케이션들을 각각 개발하는 대신 각각의 비즈니스 기능을 수행하는 서비스를 구성하고, 이 서비스를 조합하거나 분리함으로써 비즈니스 프로세스들을 구현할 수 있게 하는 정보시스템 구축을 목표로 한다. 본 연구에서는 SOA기반 소프트웨어의 분야의 기반 기술을 조사하고 SOA기반 소프트웨어 시장과 표준화 동향을 조사하며 SOA기반 소프트웨어 기능성의 품질평가 메트릭을 개발하였다.

• Journal of the Korean Operations Research and Management Science Society
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• v.21 no.3
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• pp.175-195
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• 1996

In conventional analysis methods, data and process are loosely coupled for building information systems. Several object oriented approaches have been proposed to integrate data and process. However, object oriented analysis requires a radical paradigm and thus system analysts find difficulties in generating object models direcctly from end users. To alleviate these difficulties, this paper proposes a methodology for deriving an object model by using structured analysis results. Objects are obtianed primarily from entities in Entity-Relationship Diagram. Methods are obtained through the analysis of the relationship between processes and data stores in Data Flow Diagram Methods are assigned to the objects by using object/process matrices. A real-life case is illustrated to demonstrate the usefulness of the methodology.