• Proceedings of the KIPE Conference
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• 2005.07a
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• pp.605-608
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• 2005

오늘날 통신 기능을 갖는 마이크로 프로세스 기반의 IED(Intelligent Electronic Device)가 송배전시스템 분야에서 기존의 장비들을 대체하고 있다. 단일 표준화 작업이 이루어지기 전 다양한 프로토콜의 사용에 따른 장비 간 호환성 결여로 통신 프로토콜 표준화 필요성이 강하게 제기되었고, 1990년대 표준화 작업을 시작하여 최근 변전소 자동화용 단일 세계 표준인 IEC 61850이 UCA2.0과 유럽의 경험을 기반으로 IEC주관아래 개발되었다. 이러한 세계기술 동향을 반영해 IEC 61850 기반의 종합변전소 자동화 시스템의 구축이 필요하고, 이에 따라 본 논문에서는 IEC 61850 통신 프로토콜을 살펴보고 기본적인 IED 통신 실험 장치를 구성하고 메시지 전송 실험을 수행하였다.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.19 no.10
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• pp.8-15
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• 2020

The diffusion cell method is the main technique employed for the in vitro diffusion test of transdermal drug delivery preparations. Most existing transdermal diffusion devices use a water bath heating structure and direct current motor magnetic stirrer. However, these devices are confronted with problems, such as large volume, incompatible vertical and horizontal diffusion cells, few diffusion cell sets, and poor reliability. To overcome these deficiencies, the system adopts a dry heating method and uses a rotating magnetic field generated by the electromagnetic stirrer to drive the magnetic stirrer. Accordingly, the resulting device is characterized by a simple structure and small volume, convenient operation, compatible vertical and horizontal diffusion cells, and numerous diffusion cell sets. The reliability and practicability of the system is verified by the in vitro percutaneous permeability test of the bisoprolol patch.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.445-447
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• 2008

The CCTV systems is the most extensively used for a burglar proof, a crime prevention and a Prevention forest fires etc. The CCTV systems which is used in present is a PAN/TILT form. We want to control of CCTV systems motion by Up/Down, Left/Right, Zoom In/Out, Focus, TELE. We design a 8051 microcontroller board and a Key Controller and a Relay Controller. We conformed its feasibility through the simulation.

• Electronics and Telecommunications Trends
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• v.12 no.1 s.43
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• pp.1-13
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• 1997

OSF/1 AD 운영체제에 사용된 노드간 메시지 전달 기법인 DIPC(Distributed Interprocess Communication)는 마이크로커널 내에 구현된 서브시스템으로, 다중 컴퓨터 환경에서 특정 태스크간의 통신을 효과적으로 지원할 수 있도록 설계되었다. 본 문서에서는 이러한 DIPC 서브시스템을 그 운영특성을 중심으로 자세히 살펴보았다.

• Journal of the Korea Society of Computer and Information
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• v.14 no.11
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• pp.199-211
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• 2009

Official statistics which are collected for governments and the community can be used to assess the effectiveness of governments' policies and programs. Thus, official statistics should be collected and presented based on correct findings. Erroneous official statistics will lead to lower quality results in assessing those policies and programs. Many statistical agencies, today, use on-line analytical processing (OLAP) data cubes which support OLAP tasks like aggregation and subtotals as a key part of their dissemination strategy of official statistics. Confidentiality protection in data cubes also should be made. However, sensitive parts of data cubes including micro data may be disclosed by malicious inferences. The authors have suggested an inference control process in OLAP data cubes which preventing erroneous cube creating and securing cubes against privacy breaches. The objective of this study is to establish a strategy for inference control of official statistics using the inference control process by taking the case of the Patent Application Expense Support Project.

• Korean Journal of Construction Engineering and Management
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• v.8 no.1 s.35
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• pp.141-149
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• 2007

Simulation has considerable potential as the tool of construction management, but in the case of domestic, it is at an early stage applying simulation to micro-process assesment. For applying simulation to the construction process, much effort is needed to collect input data and to build the model including the characteristics of site. This study introduces the methodology to collect operation data of construction equipment and build the simulation model, then verifies the model with the operation data. In addition, this study identifies main factors to determine the cycle time of the muck hauling system so that it suggests the method of construction process planning through operation and combination of construction equipments.

• The Transactions of the Korea Information Processing Society
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• v.5 no.9
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• pp.2404-2414
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• 1998

An operating system should be easy to extend and to be customized to accomodate the diverse needs when it is to support multiple personalities. Though microkernel is the best as architecture for such customization, it raises performance issues due to its intrinsic overhead in interprocess communication. In this paper, we present a new !PC mechanism that overcomes the traditional IPC performance lag by providing a direct bridge between processes. The communication overhead is similar to the one of local procedure call, which is the known minimal overhead. Even in its worst case, our scheme is shown to pcrfonn better than the other alternative, the message passing scheme.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.4
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• pp.339-345
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• 2002

This paper presents a portable power supply equipped with a battery charger. The proposed system can be operated separatedly distinguishing between DC/AC and AC/DC function. The former uses a battery and the latter a line voltage as the power source to operate on an inverter and a battery charger, respectively. To keep the output voltage being sinusoidal and to have the high dynamic performances even In the cases of load variations, a proper control method is adapted. The operational principles and analysis are explained in detail. The validity of the proposed system is proved from the experimental results.

• The Transactions of the Korea Information Processing Society
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• v.4 no.11
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• pp.2701-2710
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• 1997

Recursive circulant graph has recently developed as a new model of multiprocessors, and drawn considerable attention to supercomputing, In this paper, we investigate the routing of a message i recursive circulant, that is a key to the performance of this network. On recursive circulant network, we would like to transmit m packets from a source node to a destination node simultaneously along paths, where the ith packet will traverse along the ith path $(o{\leq}i{\leq}m-1)$. In oder for all packets to arrive at the destination node quickly and securely, the ith path must be node-disjoint from all other paths. For construction of these paths, employing the Hamiltonian Circuit Latin Square(HCLS), a special class of $(n{\times}n)$ matrices, we present $O(n^2)$ parallel routing algorithm on recursive circulant network.

• Journal of the Institute of Electronics Engineers of Korea SD
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• v.46 no.1
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• pp.15-23
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• 2009

Microprocessors, which need correct arithmetic operations, have been the subject of in-depth research in relation to soft errors. Of the existing microprocessor devices, the memory cell is the most vulnerable to soft errors. Moreover, when soft errors emerge in a memory cell, the processes and operations are greatly affected because the memory cell contains important information and instructions about the entire process or operation. Users do not realize that if soft errors go undetected, arithmetic operations and processes will have unexpected outcomes. In the field of architectural design, the tool that is commonly used to detect and correct soft errors is the error check and correction code. The Itanium, IBM PowerPC G5 microprocessors contain Hamming and Rasio codes in their level-2 cache. This research, however, focuses on huge server devices and does not consider power consumption. As the operating and threshold voltage is currently shrinking with the emergence of high-density and low-power embedded microprocessors, there is an urgent need to develop ECC (error check correction) circuits. In this study, the in-output data of the level-2 cache were analyzed using SimpleScalar-ARM, and a 32-bit H-matrix for the level-2 cache of an embedded microprocessor is proposed. From the point of view of power consumption, the proposed H-matrix can be implemented using a schematic editor of Cadence. Therefore, it is comparable to the modified Hamming code, which uses H-spice. The MiBench program and TSMC 0.18 um were used in this study for verification purposes.