• Electronics and Telecommunications Trends
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• v.28 no.1
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• pp.110-120
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• 2013

국내 이동통신 산업의 중요성 및 빠른 변화에도 불구하고, 국내 이동통신 산업만을 대상으로 한 산업연관효과에 관한 체계적인 연구는 미흡한 상태이다. 본 연구는 여타 연구와 달리 기술 및 산업 속성에 따라 국내 이동통신 산업을 크게 기기, 장비, 서비스 3가지 부문으로 분류하여 산업연관분석을 실시하였다. 또한 최근 국내 이동통신 산업이 전 산업에 미치는 영향의 변화를 파악하기 위해, 한국은행에서 발표한 2003년, 2005년, 2007년, 2009년 산업연관표를 이용하여 산업연관효과의 연도별 변화를 분석하였다. 분석 결과 생산유발효과의 전후방연쇄효과는 기기, 서비스, 장비 3가지 부문 모두 공통적으로 상승하는 추세를 보였다. 그리고 부가가치유발효과는 장비를 제외한 기기와 서비스에서 감소하는 것으로 나타났고, 고용유발효과는 기기를 제외한 장비와 서비스에서 증가 추세를 보였다. 특히 이동통신기기 분야의 고용유발효과 감소 추세는 대내적으로 자본 집약화, 기술 집약화에 따른 고급인력의 수급 불균형 현상 등과 더불어 국내 단말업체들의 해외 생산기지 이전이 국내 고용에 악영향을 준 것으로 추정된다.

• Electronics and Telecommunications Trends
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• v.28 no.1
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• pp.9-20
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• 2013

포레스터 리서치(Forrester Research)에 따르면 클라우드 시장은 2010년 400억 달러를 기점으로 2020년 2,400억 달러로 성장할 것이라고 예측하고 있다. 급격하게 성장하고 있는 클라우드의 pay-per-use는 그동안 시스템 활용의 한계를 느끼던 HPC(High Performance Computing) 사용자에게 상당한 매력으로 작용하고 있다. 그러나 현재 대부분의 클라우드는 HPC와 접목하기에는 한계들이 존재한다. 본고는 HPC가 클라우드로 이동하기 위해 해결해야 하는 도전과제와 장점을 알아보고, 현재 HPC 클라우드의 산업 현황에 대해 살펴본다. HPC와 클라우드 접목에 따른 HPC 위주의 성능 측정의 문제와 새로운 측정 지수 도입의 필요성 및 HPC가 클라우드로 서비스되기 위해 클라우드가 지원해야 할 요소들에 대해 기술하였다. 제기된 이슈들에 대한 접근이 해결된다면 HPC의 클라우드로의 전환도 머지 않을 것이다.

• Electronics and Telecommunications Trends
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• v.33 no.3
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• pp.78-88
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• 2018

As the unmanned aerial vehicle industry and its related technologies grow each year, the number of abuse cases caused by drones is increasing. In addition to the invasion of privacy caused by indiscriminate photography, terrorism using unmanned aerial vehicles, which have a low detection probability, high location accuracy, and the capability of targeting people or places, as well as carrying chemicals, radiation materials, and small bombs, is becoming a significant problem around the world. Accordingly, many companies are developing anti-drone solutions that consist of various technologies such as radar, EO/IR cameras, and RF jammers to detect and disable unmanned aerial vehicles. This article briefly introduces the recent R&D trends and technical levels of anti-drone technologies.

• Journal of Institute of Control, Robotics and Systems
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• v.7 no.11
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• pp.939-943
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• 2001

PLC(programmable Logic Controller)s essential components of modern automation systems encompassing almost every industry. Ladder Diagrams (LD) have been widely used in the design of such PLC since the LD is suitable for the modeling of the sequential control system. However, the synthesis of LD itself mainly depends on the experience of the industrial engineer, which may results in unstructured or inflexible design. Hence, in this paper, we propose a ladder diagram conversion algorithm which systematically produces LDs for PLCs based on discrete event models to enhance the structured and flexible design mechanism.

• Journal of the Korean Society for Precision Engineering
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• v.18 no.7
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• pp.65-71
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• 2001

The development process of the polishing system for the aspherical lens mold for opto-electronics industry is described. The system uses the method that polishing tool is scanned on the surface under PC-NC control for the aspherical lens mold. The two axes interpolation of the minimum translation mechanism is applied to give uniform working condition by motion analysis. An aspherical surface is divided into multiple sections and each dwell time is calculated from the polishing rate model based on the Preston equation. As result of form error compensation experiment, initial form error is decreased about 25% while an average value of surface roughness is also reduced successfully from 180nm to 19nm.

• Transactions on Electrical and Electronic Materials
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• v.14 no.4
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• pp.172-176
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• 2013

Microelectromechanical system switches are becoming more and more popular in the electronics industry; there is a need for careful selection of the materials in the design and fabrication of switches for reliability and performance issues. The membrane used for actuation to change the state of an RF switch is made mostly using gold or aluminum. Various designs of membranes have been proposed. Due to the flexure-type structures, the design complexity increases, which makes stress analysis mandatory to validate the reliability and performance of a switch. In this paper, the effective stress and actuation voltage required for different types of fixed-fixed membranes is analyzed using finite element modeling. Effective measures are presented to reduce the stress and voltage.

• IE interfaces
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• v.20 no.3
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• pp.245-256
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• 2007

Toyota Production System (TPS) has been known a new production paradigm applicable to every type of manufacturing industry, not restricted to automobile assembly system. The basic framework of TPS has been studied and presented actively; many enterprises from all over the world including some of large domestic companies, have adopted and applied. This study analyzed the cases for TPS introduction and application process of LG Electronics and SAMSUNG Electronics, Semiconductor Division. On a different areas of business items, different strategic approaches are developed and implemented on a two comparable domestic companies. Key success factors for two companies are analysed, and some issues are also discussed.

• Journal of Korea Multimedia Society
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• v.19 no.5
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• pp.856-864
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• 2016

Recently, HD transmission was commonplace in the case of the terrestrial broadcasting, furthermore, 4k UHD broadcasts are also being pilot and such as HD contents are common even in smart-phones. Like this, through both the content and audience are in the situation to take advantage of the HD mobile TV, only QVGA video contents are being transmitted in the terrestrial DMB broadcasting. In this paper, introduction plan of HD DMB service for activation of DMB industry will be described in terms of technical, institutional, and policy to overcome the limitations of such as DMB broadcasting. Due to the introduction of HD DMB, high quality contents will be provided to audience and the advertising revenue DMB broadcasters increased so that the market share of DMB in mobile broadcasting be recovered.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.29 no.9
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• pp.81-88
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• 2015

LED has been great attentions in lighting industry because of its long life-time, high efficiency, excellent light output characteristics. However, the life-time of the LED driving system is decreased because of the electrolytic capacitor which is used in the power conversion system for driving LED lighting. Therefore the capacitance reduction methods have been studied to replace an electrolytic capacitor with film or tantalum capacitor. This paper presents the Single stage PFC flyback converter with the simplified third harmonic current injection circuit to reduce output capacitance and the proposed system is theoretically analyzed and verified through the experiment.

• Journal of Electrical Engineering and Technology
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• v.11 no.2
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• pp.490-498
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• 2016

Proportional Integral Derivative (PID) controller tuning is an area of interest for researchers in many areas of science and engineering. This paper presents a new algorithm for PID controller tuning based on a combination of bacteria foraging and particle swarm optimization. BFO algorithm has recently emerged as a very powerful technique for real parameter optimization. To overcome delay in an optimization, combine the features of BFOA and PSO for tuning the PID controller. This new algorithm is proposed to combine both the algorithms to get better optimization values. The real time prototype model of paper machine is designed and controlled by using PIC microcontroller embedded with the programming in C language.