• Journal of the Korean Society for Precision Engineering
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• v.31 no.6
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• pp.527-534
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• 2014

The control system of human torso model and driving system of stethoscope for physical assessment trainer are developed. The detecting characteristics of circular pickup coil which is driven by square wave voltage signal with resonance frequency of LC circuits are investigated and it is confirmed that the pickup coil can detect the existence of chestpiece near the coil region. The control system of human torso model is composed of 8 channel pickup coils, Mp3 and Bluetooth module. The driving system of stethoscope is composed of chestpiece with contact switch and Bluetooth headset. The chestpiece detecting algorithm check the contact of chestpiece with human body model first and excite the pickup coil sequentially to find the location. The proposed system can be applied the physical assessment trainer.

• Proceedings of the Korean Information Science Society Conference
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• 2002.10e
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• pp.127-129
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• 2002

NP Forum에서는 다양한 밴더의 네트워크 프로세서와 스위치 패브릭간에 물리적 인터페이스를 제공하기 위해 CSIX-L1(Common Switch Interface-Level 1 )인터페이스를 표준화하였다. IBM 네트워크 프로세서는 MPLS 및 VPN, VLAN, Security, Ipv6와 같은 다양한 어플리케이션과 TBI. SMII CMII. POS bus등 다양한 가입자 인터페이스를 지원하며, L2 기 반에서 2.5Gbps 이상의 패킷 처리를 수행하기 때문에 많은 시스템에 사용된다. 그러나 IBM네트워크 프로세서는 스위치 인터페이스로 DASL인터페이스를 사용한다. 따라서 DASL인 터페이스와 CSIX-L1 인터페이스를 정합하기 위해서는 IBM UDASL칩을 이용해 DASL인 터페이스를 UTOPIA-L3인터페이스로 변환해야 하며, 이것을 다시 CSIX-L1인터페이스로 변환해야 한다. 따라서 본 논문에서는 UTOPIA-L3인터페이스 패킷과 CSIX-L1인터페이스 프레임을 상호 변환하는 모듈을 설계하였으며, 32비트 데이터 버스와 최대 125MHz로클록을 사용해 최대 4Gbps의 패킷처리를 제공하도록 구현하였다. 또한 스위치 패브릭의 특정 포트에서 과잉 트래픽 전달로 인해 발생할 수 있는 블로킹을 방지하기 위해 네트워크 프로세서에게 3개의 Priority／최대 64개 포트수의 VOQ(Virtual Output Queue)를 제공하는 기법에 대해서 기술한다.

• Proceedings of the IEEK Conference
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• 2002.07c
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• pp.1847-1850
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• 2002

In this paper, MPLS Router module supporting Differentiated Service(Diffserv) for quality of Service (QoS) and High-speed switching is proposed and implemented. And we compare and analyze the proposed architecture with the conventional one in terms of CLR (Cell Loss Rate) and average delay. Switch is an extended system of Queue of each VOQ and PHB in the manner of Input Queuing for QoS. Algorithm, Priority-iSLIP is used for its scheduling algorithm. The proposed architecture is modeled in C++ and verified.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.300-301
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• 2018

본 논문에서는 인덕션 쿠커의 스위칭 전력반도체에서 발생되는 스위치 손실을 비교 분석한다. Si-기반 전력반도체의 효율 상승이 한계점에 도달함에 따라 고속 스위칭 및 저손실 특성을 지닌 SiC, GaN와 같은 와이드밴드갭 소자를 활용한 고전력밀도 컨버터의 연구가 활발히 진행되고 있다. 이에 소비자 가전분야의 인덕션쿠커 공진형 하프-브릿지 전력회로의 기존 Si-IGBT를 GaN-FET과 SiC-FET으로 구성하여 스위치 손실모델을 유도하고 이를 통해 세 가지의 전력반도체가 적용된 인덕션 쿠커의 스위치 손실을 비교분석한다. 분석된 손실모델은 PSIM Thermal Module을 통하여 검증한다.

• Proceedings of the KIPE Conference
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• 2019.11a
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• pp.198-199
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• 2019

이 논문에서 제안하고자 하는 컨버터는 태양광 모듈이 결합된 Phase-shifted Full-bridge(PSFB) 컨버터이다. 기존 전기자동차의 전력변환 시스템에는 고전압 배터리와 저전압 배터리간 전력전달을 위한 DC-DC 컨버터가 존재한다. 저전압 배터리 충전에 있어 고전압 배터리 외에 태양광 모듈 컨버터를 사용하여 고전압 배터리 사용량을 낮출 수 있다. 이 논문에서는 기존의 PSFB 컨버터의 2차측에 태양광 모듈과 스위치하나를 추가하여 태양광 Buck Converter를 구성하였고 PSFB컨버터의 출력 인덕터와 Synchronous switch를 사용하게 되어 소자 수를 절감하였다. 또한 PSFB 동작 시 1차측 전류가 Free wheeling하는 구간에서 태양광 Buck converter를 동작함으로써 고전압 배터리와 태양광 모듈에서 동시에 저전압 배터리로 전력공급이 가능하게 하였다.

• Proceedings of the KIEE Conference
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• 2000.07b
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• pp.1065-1067
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• 2000

This paper describes performance analysis of ARCP Inverter, which can offer zero voltage switching at nominal voltage stress. The system consists of a voltage-source inverter with sort-switching module. Each main switch is connected in parallel with resonant capacitor and two auxiliary switches are placed in series with a resonant reactor for soft-switching capability. The described ARCP inverter could be effectively applied for active power filter reactive power compensator, and UPS.

• Proceedings of the KIEE Conference
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• 2000.07d
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• pp.3210-3212
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• 2000

We designed and manufactured 300MHz NMR RF Transceiver. NMR system is composed of NMR Spectrometer, Superconductive Magnet and Pulse Programmer, GUI. NMR RF Transceiver is composed of transmitter, receiver, frequency synthesizer. T/R switch, main power amp., RF coil. To phase modulation, transmitter is composed of mixer, splitter and combiner et al. To weak signal detection, receiver is composed of pre-amp., filter, mixer et al. Each module is manufactured PCB. And installed NMR system to detect chemical component of specimen. In result, we can get the information of specimen.

• International journal of advanced smart convergence
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• v.4 no.2
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• pp.120-123
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• 2015

The use of smart devices worldwide has been increasing day by day and its applications based on IoT have been also extended. But the power control system requires complicated control and processing information from the various sensors in practice. One of the best ways to save the power consumption is to manage electrical equipment individually on the Internet. In this paper, remote power control system for managing the power through the relay switch module via Python server was implemented by using Raspberry Pi. The proposed power control system can be used anywhere over the Internet.

• Proceedings of the KIEE Conference
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• 2001.07d
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• pp.2603-2605
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• 2001

In this paper, we introduce the concept and construction of a web-based bidirectional remote laboratory system. In this configuration, students build and test circuits using internet at home, and the circuit components and experimental equipments at the school are interconnected following student's design. This means that it is possible to choose components, build circuits, connect experiment equipments, control the equipment. and receive measurement results at home in real-time. Labview and Java are used to control this system efficiently and to provide user-friendly environments. Computer-based function generator, DMM, and oscilloscope are used and switch module is used to change interconnections. It was found that a system adopting computer-based instruments, which include PXI/CompactPCI modules and PC plug-in board, provide better performance than that adopting stand-alone instruments connected with GPIB. It is believed that, if this system is installed, the real experiments, not the virtual experiments based on simulation, can be done at home effectively, resulting in revolutional change in engineering education.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2009.05a
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• pp.321-323
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• 2009

When power failure occurs at multi-housing complex, auxiliary generator or emergency generator starts to provide power to households. This power is connected to emergency power ELB(Earth Leakage Breaker) at home distribution panel board and supplies power only for emergency light in living room but for heating system, refrigerator and other inevitable apparatuses that are in need of uninterruptible power. Since those domestic appliance are fed from common power line, they are inoperable during power failure. Our research is to resolve this problem by developing compatible relay-drive common/emergency-power ATS (automatic transfer switch) for home distribution panel board. In case of power failure, it transfers automatically and commences to provide power from emergency generator. Through this, Consumers can reach satisfaction where common power loads operate without any problem under both ordinary and power failure condition.