• The Safety technology
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• no.202
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• pp.16-17
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• 2014

오륜은 지난 1989년 설립 이래 지금까지 지속 성장을 거듭하고 있는 대표적인 강소(强小)기업이다. 이 전남 여수의 작은 기업이 어떻게 200여 명의 사원을 거느린 탄탄한 중견기업으로 성장할 수 있었을까. 이에 대한 해답은 '경영자의 높은 안전의식'에서 찾을 수 있다. 오륜의 창업자이자 현 경영자인 이기동 대표는 국내 주요 화학회사에서 근무를 하며 IFP공정 등 화학전문과정을 수료한 화학공정전문가로, 설립 초기부터 안전을 경영의 핵심가치로 내세웠다. 기업의 지속 성장을 위해서는 반드시 안전이 뒷받침 돼야한다는 것이 그의 철학이었다. 이런 이대표의 굳은 신념에 따라 오륜은 체계적인 안전관리시스템을 구축하고, 이를 바탕으로 기술력을 향상시켜나갔다. 그리고 그 결과 삼성SDI 등 국내 굴지기업들의 협력사이자 삼성전자의 주력 제품에 부품을 공급하는 핵심 기업으로 거듭났다. 또한 이 대표는 올해 대한산업안전협회로부터 감사패를 수여 받는 등 안전문화 확산에 대한 높은 공로를 대내외에서 인정받았다. 안전경영의 표본으로 올라선 이기동 대표를 찾아 그의 경영방침과 안전철학에 대해 들어봤다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.147-149
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• 2019

본 논문은 서로 독립적인 무선 전력전송 시스템의 출력들을 단일 PWM을 기반으로 하여 하나의 제어신호로 조절하는 공진형 컨버터의 설계와 구현을 다룬다. 각 출력마다 특정 주파수 범위를 할당하고 할당된 주파수를 가지는 정현파 전압 성분이 각 출력을 조절하는 제어신호로서 생성된다. 생성된 제어신호는 하나의 신호로 중첩되어 인버터 회로의 PWM 신호를 생성한다. 이 신호는 공진형 컨버터의 2차측의 대역통과공진 필터를 통과하면서 분리되어 진폭과 주파수 변조를 통해 출력을 조절한다. 본 논문에서는 4개의 출력을 가진 공진형 컨버터를 가정하였고 하드웨어 프로토타입 제작을 통해 제안하는 내용을 검증하였다.

• Proceedings of the KIPE Conference
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• 2019.07a
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• pp.174-176
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• 2019

최근 미세먼지(PM10 또는 PM2.5)로 인한 인체 유해성 및 실제 피해사례가 인터넷, TV 매체 등에 의해 화두가 됨에 따라 각종 제조, 사업장 및 발전소에서는 미세먼지 배출기준을 충족하기 위한 고효율 집진 기술이 필요로 되고 있는 상황이다. 고압 코로나 방전에 의해 미세먼지를 포집하는 고전압 하전방식 집진장치의 경우 전류를 광범위로 조절 가능하며 역전리 방지에 탁월하여 고효율의 집진이 가능하다. 본 논문에서는 기존의 다전원(펄스전원, 기본전원)을 이용한 마이크로 펄스 하전방식이 아닌 공진형 컨버터와 고압 트랜스포머, 배전압 회로를 적용한 고전압 단전원 제어 하전방식 및 이를 이용한 고전압 전압원의 저속 스위칭 제어기법을 제안하고, 실제 측정을 통해 제안 방식의 실효성을 검증하였다.

• Journal of the Korean Institute of Telematics and Electronics
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• v.23 no.3
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• pp.357-363
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• 1986

In the design of PLA's of VLSI, as the number of subsets of functions from which common preme implicants must be determined increases, the execution time increases by a factor of O(2\ulcorner. When the number of functions N is a large number, this poses a serious problem in minumization of multiple-output logic functions. In this paper a new algorithm that minimizes multiple-output logic functions is proposed. The algorithm requires less number of Fortran statements, less execution time, and less memory area than existing methods. The bases of this algorithm are explained and verified, and the sequential operation for preparation of the program is discussed.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.8
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• pp.121-127
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• 2013

Memory devices including SRAM and DRAM are very susceptible to high energy radiation particles in the space. Abnormal operation of the devices is caused by SEE or TID. This paper presents a method to estimate proton SEU cross section representing the susceptibility of the latch circuit that the unit cell of the SRAM and proposes a new latch circuit to mitigate the SEU. 50b shift register was fabricated by using the conventional latch and the proposed latch in $0.35{\mu}m$ process. Irradiation experiment was conducted at KIRAMS by using 43MeV proton beam. It was found that the proposed latch-shift register is not affected by the radiation environment compared to the conventional latch-shift register.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.4 no.5
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• pp.1143-1150
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• 2000

A dual-mode multiplier (DMM) that performs single- and double-precision multiplications has been designed using a $0.25-\mum$ 5-metal CMOS technology. An algorithm for efficiently implementing double-precision multiplication with a single-precision multiplier was proposed, which is based on partitioning double-precision multiplication into four single-precision sub-multiplications and computing them with sequential accumulations. When compared with conventional double-precision multipliers, our approach reduces the hardware complexity by about one third resulting in small silicon area and low-power dissipation at the expense of increased latency and throughput cycles. The DMM consists of a $28-b\times28-b$ single-precision multiplier designed using radix-4 Booth receding and redundant binary (RB) arithmetic, an accumulator and a simple control logic for mode selection. It contains about 25,000 transistors on the area of about $0.77\times0.40-m^2$. The HSPICE simulation results show that the DMM core can safely operate with 200-MHZ clock at 2.5-V, and its estimated power dissipation is about 130-㎽ at double-precision mode.

• Journal of Biosystems Engineering
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• v.12 no.1
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• pp.45-52
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• 1987

In order to improve the thermal efficiency of an internal combustion engine, various ignition timing control systems were examined and the best one was chosen. The parts used for the systems were a microcomputer system with DAS, 8 bit output port (D-FLIP FLOP), three types of isolation circuit, two types of ignition timing pulse generator, three types of switching circuit and two types of high voltage ignition circuit. Most systems did not operate well due to the effects of electromagnetic waves and surge currents occurring when the ignition began or ended with resulting high voltage. The best ignition timing control system was found to be the combination of (microcomputer system)-(ignition timing pulse generator using step motor position control pick-up)-(switching circuit using TR logic)-(high voltage ignition circuit using CDI).

• Journal of the Korean Institute of Telematics and Electronics C
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• v.36C no.9
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• pp.44-53
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• 1999

Generating diagnostic test patterns for combinational circuits remain to be a very difficult problem. For example, ISCAS85 c7552 benchmark circuit has 100 million fault pairs, Thus, we need more sophisticated algorithm to get more information. A new diagnostic algorithm for test pattern generation is suggested and implemented in this paper. DIATEST algorithm based on PODEM is also implemented for comparison to the new algorithm. These two algorithms have been applied to ISCAS85 benchmark circuits. Experimental results show that (1) both algorithms achieve fault pair coverage over 99%, (2) total test length of the new algorithm is much shorter than that of DIATEST, and (3) the new algorithm gives much more information used for making diagnostic dictionary, diagnostic decision tree or diagnostic test system despite DIATEST is faster than the new algorithm.

• Journal of Satellite, Information and Communications
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• v.12 no.2
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• pp.89-93
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• 2017

This paper introduces an energy harvesting system that generates energy by collecting multi-band RF signals using buck-boost DC-DC converter. In an environment where the resistance of load using the collected electric energy is constantly changing, a buck-boost DC-DC converter is used in which the input resistance of the DC-DC converter does not change even if the load resistance changes. Since the frequency band of the input RF signal varies, the rectifier is designed for each band so that multiple bands can be processed, and a matching circuit is added to each band in front of the rectifier. For a rectifier to collect very small RF signals, a circuit is designed so that a constant voltage is obtained according to a very small input signal by devising a method of continuously accumulating the voltages collected and generated in each band. It is confirmed that the output efficiency can reach up to 20% even for the RF signal having the input of -20 dBm.

• The Transactions of the Korean Institute of Power Electronics
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• v.15 no.2
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• pp.111-118
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• 2010

Recently, LCD TV using LED backlight has a great attention due to its low power consumption, slim construction, mercury free, wide color gamut and fast response. For the uniform brightness of the LCD panel, multi channel LEDs and DC/DC converter for each LED are required in conventional system. Therefore energy conversion efficiency is poor, the system size bulky and the cost of production high. To overcome these above mentioned drawbacks, a new current-balancing multi-channel LED driver is proposed in this paper. It can not only drive multi-channel LEDs with one DC/DC converter but also provide all LEDs with constant balanced current. To confirm the validity of the proposed driver, its operation and performance are verified on a prototype for 46" LCD TV.