• Proceedings of the KIEE Conference
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• 1998.11b
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• pp.603-605
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• 1998

In recent years, chip delay estimation has had an increasingly important impact on overall design technology. The analysis of the timing behavior of an ASIC should be based not only on the delay characteristics of gates and interconnect circuits but also on the interactions between them. This model plays an important role in our CAD system to analyze the ASIC timing characteristics accurately, together with two-dimensional gate delay table model, AWE algorithm and effective capacitance concept. In this paper, we present an efficient algorithm which accounts for series resistance by computing a reduced-order approximation for the driving-point admittance of an RC-tree and an effective capacitance equation that captures the complete waveform response accurately.

• Journal of Korean Institute of Industrial Engineers
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• v.25 no.4
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• pp.476-489
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• 1999

This paper is concerned with the deployment of core technologies for automotive steel sheets, based on the structural change of global market. The main tasks of automotive industry are to ensure the energy consumption, environmental regulations, and driving safety. With social and legal requirements, this study analyzes the market creation processes with technological innovations for hot rolled, cold rolled and galvanized steel sheets during the 20th century. It has been proven that the leading country in the steel industry was also that in the automotive. The purchaser-supplier relations of sheet materials are then patternized in the regional markets of the United States and Japan, who share nearly 50% of market in the world. According to the paradigm shift of globalization, the balance of power in Porter's 5 forces has been moved to the buyers', and both industries pursue Win-Win strategies such as the PNGV(Partnership for a New Generation of Vehicles ) and design-in system with the competition.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2006.05a
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• pp.278-281
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• 2006

A Hybrid type LPM(Linear Pulse Motor) is designed as single side stator structure. Experimental results are shown that the static and dynamic characteristics. By the computer simulation, the permanent magnet design method is also clarified to desired thrust force. And microstep driver is adopted to the position controller to the designed LPM. The driver suppressed position errors within ${\pm}1501{\mu}m$.

• Proceedings of the KIPE Conference
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• 2008.10a
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• pp.187-189
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• 2008

화석연료의 고갈과 에너지 공급의 불안정성을 극복하기 위하여 화석연료를 대체할 수 있는 신 재생에너지의 개발이 시급하다. 특히 우리나라는 화석에너지의 수입 의존도가 97% 이상을 상회하고 선진국 대비 4배 이상의 에너지소비증가율을 보이는 우리나라에서는 장기적인 에너지 수급정책의 수립과 신 재생에너지 개발이 절실히 필요하다. 본 연구에서는 신 재생에너지중 세계에서 가장 각광받고있는 연료전지 시스템 중 PEMFC 즉 고분자 연료전지의 직접 설치 구동과 구동특성을 파악하는데 목적을 두고 연구를 진행하였다.

• Proceedings of the KIPE Conference
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• 2012.07a
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• pp.443-444
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• 2012

최근 각광받고 있는 반도체 발광 소자를 이용한 고체 상태 광원(Solid State Lighting)은 기존 광원에 비해 고효율이어서 에너지 절약적 측면에서 대두되고 있다. 점광원인 LED에 비해 면광원인 OLED는 두께를 얇게 구현할 수 있고, 다양한 모양으로 광원의 구현이 가능하다. 따라서, 본 논문에서는 효율적인 OLED 조명 구동을 위해 넓은 입력전압 범위를 지니는 Buck-Boost 컨버터를 제안한다.

• Proceedings of the KIEE Conference
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• 1993.07b
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• pp.1020-1022
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• 1993

The speed control associated with do send motors for direct-drive applications of mobile robot is considered. In odor to the high-performance operation of dc servo motor, drive circuits is controlled Pulse Width Modulations. In this case, PWM driving circuit has nonliner charactristics. This circuit composed of H-type bridge with freewheeling diodes in odor to deal with storage energy of motor's inductance and also control method is developed. At resultes, speed charactristics of motor is shown lineristics. In oder to speed control of motor. The opertion of phase-locked servo system is described and a linear discrete model is developed to their behavior. Thise model discussed are the design problems, speed variation.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.10a
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• pp.517-519
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• 2015

국내 한 가구 당 차량 한대 이상을 보유하고 있을 정도로 차량이 보급화 되면서 차량에 관심이 높아지고 있다. 이와 더불어 차량의 유지비용 절감 및 교통사고 예방 등 차량과 관련된 여러 가지 서비스가 이슈로 떠오르고 있다. 차량 제조사들은 텔레매틱스 및 커넥티드 카 서비스 등 여러 가지 서비스를 제공하고 있으나, 커넥티드 카 모듈이 장착된 차량 전용 서비스로만 제공되며, 모듈을 장착하기 위해서는 고가의 비용을 지불해야만 한다. 본 논문에서는 범용적으로 사용 가능한 IoT 디바이스 기반 운전습관 분석 및 추천 시스템을 제안한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.04a
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• pp.843-845
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• 2012

전기자동차 또는 로봇의 자율 주행에 필요한 여러 가지 기술 가운데 위치 인식과 진행 방향을 결정하는 외부 환경인지 능력은 매우 중요하다. 본 논문에서는 GPS 수신 장치와 각종센서를 내장한 안드로이드 폰을 활용하여 자율 운행 중인 골프카트의 위치 정보를 획득하고 도로이탈 여부를 판별할 수 있는 시뮬레이션 시스템을 개발한다.

• Journal of Korea Multimedia Society
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• v.25 no.8
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• pp.1007-1021
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• 2022

Autonomous driving of unmanned aerial vehicles may have to pay expensive cost to create and switch new routes if unexpected obstacles exist or local map updates occured by the control system due to incorrect route information. Integrating digital twins into the path-following process requires more computing resources to quickly switch the wrong path to an alternative path, but it can quickly update the path during flight. In this study, we design a DEVS-based simulation environment which can modify optimized paths through short-term simulation of multi-virtual UAVs for applying digital twin concepts to path follow. Through simulation, we confirmed the possibility of increasing the mission stability of UAV.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.257-258
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• 2021

Construction robotics is rapidly forming a market in conjunction with the development of sensing and artificial intelligence technologies. The layout work for accurately constructing the shape and dimensions of the building frame requires high accuracy and precision, and is one of the high demands for productivity and quality improvement through construction automation. Thus, as a preliminary study, we derived the elemental factors and performance requirements for developing an automated layout robot. In addition, alternatives on driving and marking units were investigated based on literature review and practioner's interview. The result of this study will be used as a basic data for the layout robot design.