• Title/Summary/Keyword: Electronics Industry

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Design of local exhaust ventilation for preventive maintenance in semiconductor fabrication industry using CFD (전산유체역학을 이용한 반도체 제조공정의 PM 전용 후드 설계 연구)

  • Hong, Jwaryung;Koo, Jae-Han;Park, Chang-Sup;Choi, Kwang-Min
    • Journal of Korean Society of Occupational and Environmental Hygiene
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    • v.29 no.2
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    • pp.208-216
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    • 2019
  • Objective: The aim of this study is to control residual chemicals or by-products generated in chambers during preventive maintenance (PM) in the semiconductor manufacturing industry. We designed local exhaust ventilation using computational fluid dynamics (CFD). Methods: The air flow characteristics and capture efficiency between rectangular and slot hoods were compared numerically. The software Fluent 18.1 was used to estimate uniform velocity distribution and capture efficiency for contaminants. A metal from group 15 in the periodic table was released at the bottom of the chamber to simulate emissions. Results: The slot hood had a higher capture efficiency than a rectangular hood under the same conditions because the slot hood provided uniform air flow and higher face velocity. Also, there was no rotating swirl in the plenum for slot, that is why slot had better efficiency than rectangular even though they had similar face velocity. With less than 10 slots, the capture efficiencies for contaminants were nearly 95%. The optimum conditions for a hood to achieve high efficiency was 8 to 10 slots and a face velocity over 1 m/s. Conclusions: Well-designed ventilation systems must consider both efficiency and convenience. For this study, a slot hood that had high capture efficiency and no work disturbance was designed. This will contribute to protection of the worker's health in a PM area and other areas as well. Also, this study confirms the possibility of the application CFD in the semiconductor fabrication industry.

A Study on the Analysis of TEB Local Planner Parameters to Improve the Target Reach Time of Autonomous Mobile Robot (자율주행 이동로봇의 목표 도달 시간을 개선하기 위한 TEB Local Planner 파라미터의 분석에 관한 연구)

  • Roh, Hyeong-Seok;Jung, Ui;Han, Jung-Min;Jeon, Jung-Hyeon;Jeon, Ho-Nam
    • Journal of the Korean Society of Industry Convergence
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    • v.25 no.5
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    • pp.853-859
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    • 2022
  • In this study, we analyzed the instantaneous trajectory generation capability and target arrival rate of a mobile robot by changing the parameter of the TEB (Timed Elastic Band) Local Planner among local planners that affect the instantaneous obstacle avoidance ability of the mobile robot using ROS (Robot Operating System) simulation and real experience. As a result, we can expect a decrease in the target arrival time of the mobile robot through a decrease in the parameter values of the TEB Local Planner's min_obstacle_dist, inflation_dist, and penalty_epsilon. However, if this parameter is reduced too much, the risk of obstacle collision of the moving robot is increases, so it is important to combine the appropriate values to construct the parameter.

Technology trend of printed electronics and its implications on contents industry (인쇄전자 기술 발전 동향과 콘텐츠 산업에의 시사점)

  • Chung, ji-hyong;Ha, young-wook;Heo, pil-sun
    • Proceedings of the Korea Contents Association Conference
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    • 2011.05a
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    • pp.45-46
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    • 2011
  • 본 연구에서는 새로운 전자소자 및 부품 제조기술로 각광받고 있는 인쇄전자 기술의 발전 동향을 기반기술과 응용분야별로 살펴보고 이러한 제조기술의 발전이 콘텐츠 산업에 미치는 영향을 살펴본다.

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Implementation of Lower-Power HDMI 1.3A CEC using MCU (MCU를 이용한 저전력 HDMI 1.3A CEC 모듈 구현)

  • Jeong, Kwang-Seob;Moon, Ho-Sun;Kim, Yong-Deak
    • Proceedings of the IEEK Conference
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    • 2008.06a
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    • pp.735-736
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    • 2008
  • Recently Multi media industry require HDMI-CEC which is the system to integrate various product one action. So you need to implement CEC when you use HDMI1.3a. In this paper, presented how to make CEC protocol in MCU and how to reduce power consumption. This system implement CEC protocol and uart communication as using WELTREND MCU.

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Crane control system for raw material yards

  • Ihara, Susumu;Mito, Kunihiko;Tanaka, Yoshihisa;Shibata, Jun
    • 제어로봇시스템학회:학술대회논문집
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    • 1989.10a
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    • pp.721-726
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    • 1989
  • A control system was developed for raw material yards of the works of a metal industry. It is devoted to the automatic operations of the raw material yards stackers, and to the improvement of the stacking method to stack granular coal uniformly. The system automatically controls the stacking operations without human intervention, and also prevents any collision between cranes, stackers, jibloaders and the level-roughing cranes.

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A Study on Application of Vibration Testing Method (진동 시험 기법의 적용에 관한 고찰)

  • Lee, Chang-Hoon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.587-591
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    • 2012
  • Review of practical vibration test methods those applied in various industrial fields - such as automotive industry, electrics and electronics industry, defense industry and aerospace industry - is described on this paper. Swept sine test, random vibration test and advanced vibration techniques are explained according to their parametric values and also application fields of each test method are suggested by the characteristic of each method. For more proper application of each test method, standardized test specifications should be always reviewed and revised according to the transition of environmental factors.

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The Relationship between Mobile Termination Rates and Retail Prices : Some Arguments and Empirical analyses (이동통신서비스 접속대가와 소매요금간의 관계 : 논거와 실증 분석)

  • Lee, Seong-Jun;Han, Sung-Soo;Choi, Saesol
    • Journal of Korean Institute of Industrial Engineers
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    • v.40 no.6
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    • pp.609-617
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    • 2014
  • Lately there are many approaches for decreasing the retail prices for mobile telecommunication in response to higher demand of the consumer welfare. Related on this perspective, there have been many disputes how the MTR (mobile termination rate)s from the whole market has influences on the consumer prices at the retail market. Therefore, we need a timely review about the possibility of the reduction of retail prices with MTR policies. The purpose of this paper is to study the relationship between MTR and retail prices. For this purpose, we can identify three kinds of arguments by reviewing the previous literatures. We empirically analyze the relationship with latest European data and Korean annual data. Furthermore, we also examine whether the relationship would depend on the competition structure. The results imply that decreasing MTR would result in reduction of the retail prices but the effect would be enhanced by improvement of market concentration.

Moving Shadow Detection using Deep Learning and Markov Random Field (딥 러닝과 마르코프 랜덤필드를 이용한 동영상 내 그림자 검출)

  • Lee, Jong Taek;Kang, Hyunwoo;Lim, Kil-Taek
    • Journal of Korea Multimedia Society
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    • v.18 no.12
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    • pp.1432-1438
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    • 2015
  • We present a methodology to detect moving shadows in video sequences, which is considered as a challenging and critical problem in the most visual surveillance systems since 1980s. While most previous moving shadow detection methods used hand-crafted features such as chromaticity, physical properties, geometry, or combination thereof, our method can automatically learn features to classify whether image segments are shadow or foreground by using a deep learning architecture. Furthermore, applying Markov Random Field enables our system to refine our shadow detection results to improve its performance. Our algorithm is applied to five different challenging datasets of moving shadow detection, and its performance is comparable to that of state-of-the-art approaches.

Design and Implementation of Distributed Charge Signal Processing Software for Smart Slow and Quick Electric Vehicle Charge

  • Chang, Tae Uk;Ryu, Young Su;Song, Seul Ki;Kwon, Ki Won;Paik, Jong Ho
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.3
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    • pp.1674-1688
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    • 2019
  • As environmental pollution and fossil fuel energy problems from fuel vehicle have occurred, the interest of electric vehicle(EV) has increased. EV industry and energy industry have grown dynamically in these days. It is expected that the next generation of primary transportation will be EV, and it is necessary to prepare EV infra and efficient energy management such as EV communication protocol, EV charge station, and smart grid. Those EV and energy industry fields are now on growth. Also, the study and development of them are now in progress. In this paper, distributed charge signal processing software for smart slow and quick EV charge is proposed and designed for dealing with EV charge demand. The software consists of smart slow and quick EV charge schedule engine and EV charge power distribution core. The software is designed to support two charge station types. One is normal EV charge station and the other is bus garage EV charge station. Both two types collect the data from EV charge stations, and then analyze the collected data. The software suggests optimized EV charge schedule and deliveries EV charge power distribution information to power switchboard system, and the designed software is implemented on embedded system. It is expected that the software provides efficient EV charge schedule.