• Proceedings of the Korean Powder Metallurgy Institute Conference
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• 2006.09b
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• pp.1284-1285
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• 2006

We reported a P/M soft magnetic material with core loss value of $W_{10/1k}=68W/kg$, which is lower than that of 0.35mm-thick laminated material, by using high purity gas-atomized iron powder. Lack of mechanical strength and high cost of powder production are significant issues for industrial use. In order to achieve both low core loss and high strength by using inexpencive powder, the improvement of powder shape and surface morphology and binder strength was conducted. As the result, the material based on water-atomized powder with 80 MPa of TRS and 108 W/kg of core loss (W10/1k) was achieved.

• Proceedings of the KSR Conference
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• 2004.10a
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• pp.1278-1284
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• 2004

Platform screen dorr (PSD) is equipment composed of screens and doors on the platform of subways or light trains, separating the platform from the railroad. The equipment is opened and closed in connection to the doors of carriages. In order to operate the system safely, it is important to understand the characteristics of key parts. There are many parts and environmental factors such as voltage, current and temperature change but the present study measured the change rate of torque and energy changes according to the temperature of the driving motor and analyzed the characteristics of the changes and examined the features of a motor required for stable PDS and the conformability of control programs.

• Proceedings of the Korean Geotechical Society Conference
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• 2008.10a
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• pp.1278-1284
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• 2008

This study carried out bender element tests in a calibration chamber in order to estimate the characteristics of soil specimen prepared in a calibration chamber. Basically, the purpose of bender element test is to measure the shear wave velocity. Bender element test cannot only confirm the status of soil specimen deposited in a chamber, but also estimate the consolidation process indirectly. In order to carry out bender element test in a calibration chamber, a pair of bender elements was installed inside the chamber, using the 'ㄷ' shaped frame. For the sandy soils having various relative densities in various stress conditions, the maximum shear modulus was estimated. From the comparison with bender element test results in a triaxial testing device, testing device and procedure was validated.

• Annual Conference of KIPS
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• 2002.11b
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• pp.1281-1284
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• 2002

본 논문은 인터넷을 이용한 음성통신 서비스를 제공하기 위해 사용되는 VoIP 시스템 칩 설계 및 기능 검증을 위한 보드 개발에 관한 것이다. 구성이 간단한 시스템을 구현하기 위하여 32 비트 RISC 프로세서인 ARM922T 프로세서 코어를 중심으로 IP 망 접속 기능, 톤 발생 및 음성신호 접속기능과 다양한 사용자 정합 기능을 가지는 VoIP 시스템 칩을 설계하고, 이 칩의 기능을 검증하기 위하여 시험 프로그램 및 통신 프로토콜을 개발하였으며, 각종 설계 및 시뮬레이션 툴을 사용하고 ARM922T와 FPGA가 결합된 Excalibur를 사용한 시험용 보드를 개발하여 시험하였다.

• Annual Conference of KIPS
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• 2000.10b
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• pp.1281-1284
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• 2000

능동 데이터베이스 시스템은 일반적인 데이터베이스 시스템과 달리 어떤 사건이 발생하면 조건의 성립 여부에 따라 적절한 반응을 자동적으로 실행하는 시스템이며, 능동성은 사건, 조건 그리고 조치로 이루어진 능동규칙에 의해 수행된다. 그러므로 능동 데이터베이스는 규칙의 개념이 중심이 된다. 규칙은 사용자와 응용프로그램 또는 데이터베이스 관리자에 의해 정의되며, 대부분 일반적인 형태인 ECA로 이루어져 있다. 따라서 본 논문에서는 에너지관리 시스템에 적용하기 위한 능동 규칙 시스템의 구조에 따른 능동규칙을 일반적인 규칙언어 형태를 바탕으로 설계하고, 다양한 응용시스템에서의 확장성을 제시한다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.7A
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• pp.1284-1289
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• 2001

The characteristics of the intellectual property right(IPR) conflict with standardization. This is because standardization aims to achieve the common use of technology while IPRs aim to protect the proprietary right on technology. The license to use IPR should be granted so that standards can be used without an infringement. IPR policies have common characteristics in most parts of their contents and also different application methodologies. The ultimate object of IPR policy is to receive license grant. In this paper, significant typical IPR policies of main standardization organizations are comparatively analyzed. The overall objective of the IPR policy is to make strategic environment for license grant. IPR disclosure becomes the best practice to acquire license grant. With this practice, the action to licensing refusal becomes one of the main strategic factors of IPR policies.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 1993.06a
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• pp.1281-1284
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• 1993

By the exponential representation form (EF) for fuzzy logic, any fuzzy value a (in fuzzy valued logic or fuzzy linguistic valued logic) can be represented as Bc, where B is called the truth base and C the confidence exponent. This paper will propose the basic concepts of this form and discuss its interesting properties. By using a different truth base, the exponential form can be used to represent the positive and the negative logic in fuzzy valued logic as well as in fuzzy linguistic valued logic. Some Simple application examples of EF for approximate reasoning are also illustrated in this paper.

• Journal of Mechanical Science and Technology
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• v.20 no.8
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• pp.1284-1291
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• 2006

Single phase pressure drops in micro tubes were investigated through an experimental measurement and a numerical simulation. Experimental Po was obtained in circular micro tubes with 87 and $118{\mu}m$ diameter with distilled water. Experiments were carried out in laminar flow region with varying the Re 15-450 for the $87{\mu}m$ diameter tubes and 60-1300 for the $118{\mu}m$ diameter tube. No early transition from laminar to turbulent flow was detected for the experimental range. The computational estimation of pressure drop in the $87{\mu}m$ diameter tube was performed with the aid of CFD software. Boundary conditions from experiments were used for the numerical simulation. The results of experimental and numerical studies showed a good agreement with the conventional macro theory.

• Annual Conference of KIPS
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• 2002.04b
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• pp.1281-1284
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• 2002

OAI는 간단한 프로토콜을 정의함으로써 디지털도서관 사이의 상호이용의 문제점을 해결하기 위해 제시된 프로토콜이다. OAI를 통해 디지털도서관사이의 상호이용을 가능하게 하기 위해, 디지털도서관이 가지고 있는 컨텐츠에 대한 메타데이터를 제공하기 위한 data provider와 이를 수집하여 유용한 서비스를 제공하기 위한 service provider라는 두개의 프레임웍이 필요하다. 본 논문에서는 OAI protocol을 따르는 많은 data provider들이 가지고 있는 정보들을 수집하고 수집된 정보를 통해 새로운 서비스를 제공하는 service provider의 기능을 설계 및 구현하였다.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.1284-1286
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• 2003

There is a growing demand on remotely sensed and GIS data services in modern society. However, conventional WEB applications based on client/server pattern can not meet the criteria in the future . Grid computing provides a promising resolution for establishing spatial information system toward future applications. Here, a new architecture of the distributed environment for remotely sensed data processing based on the middleware technology was proposed. In addition, in order to utilize the new environment, a problem had to be algorithmically expressed as comprising a set of concurrently executing sub-problems or tasks. Experiment of the algorithm was implemented, and the results show that the new environmental can achieve high speedups for applications compared with conventional implementation.