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권태환(Taehwan Kwon),김성수(Seongsoo Kim) 한국자동차공학회 2004 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
Machinability of structural steels is greatly important in manufacturing process for automobile Parts. Therefore normally Pb, Bi and S elements are added to improve machinability of structural steels, especially Pb addition has been widely used because of its exceptional ability to increase machinability with no bad effects on the mechanical properties. But Pb added free cutting steels are subjected to restriction on production, application and recycling for the reason of their Hazardous effects on the human body. Hence free cutting steel without Pb addition is required to fulfill a prolonged environmental regulation strengthened continually. In recent years, there has been an increasing endeavor to prepare for cost competitiveness with maintaining high structural performance of materials. And cost reduction of automobile parts has been achieved through development of new materials. Breaking from the conception that steels improved machinability but they have a poor ability for forming, graphitzed-steels have been investigated due to their excellent combination of machinability and formability. In this paper, material properties and forging inaccordace with heat treatment have been evaluation on graphitzed steel in which having excellent machinability and ability of forging. And application status for rack bush as an part of steering also have been studied.
조향 부품의 경량화를 위한 알루미늄 합금 및 열처리 최적화 개발
권태환(Taehwan Kwon) 한국자동차공학회 2016 한국자동차공학회 학술대회 및 전시회 Vol.2016 No.11
With an increase in interest in recent environmental problems of global warming and other environmental issues, greenhouse gas reduction by enhancing automobile fuel efficiency is urgent. High-strength aluminum alloys have been applied to chassis components such as body parts and to reduce the weight of the vehicle. Therefore, the demand has greatly increased, it has an energy-saving and advantages for minimizing the CO2 emissions from the vehicle body weight reduction when applied to a vehicle. In this study, we looked consider the effect on weight optimized improved material strength and accordingly the conditions for T6 heat-treated aluminum lightweight model A6082 aluminum alloy Universal Joint part in the steering. And finally, through the characteristics of the lighter components of the model A6082 aluminum alloy of the Universal Joint Steering components change according to the mounting conditions and the harsh automotive environment change was to determine the actual usage limit.
권태환(Taehwan Kwon),김성수(Seongsoo Kim) 한국자동차공학회 2006 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
It is very important to secure good cold-forgeablilty and heat treatment characteristic in Manufacturing of the automotive parts using Alloy steels. In generally, Alloying elements like Ni-Cr-Co are added in Carbon steel with 0.2~0.4 wt% Carbon to increase heat treatment characteristic. Hardenability goes up with increasing Alloying elements. It makes the material strength too high and it is necessary to add heat treatment during deforming process. But, this method is very complicated and correction process is required for the thermal deformation. As a result, manufacturing cost goes up because of this in-line heat treatment process. Therefore we have studied High quality automotive parts manufacturing method without in-line heat treatment and final quenching and tempering process. Refining microstructure of the 10B22 Wire Rod added a little amount of boron by rapid heating and cooling is done and high strength-ductility characteristic is achieved.
권순조(Kwon, Soonjo),김현철(Kim, Hyuncheol),황태환(Hwang, Taehwan),이재민(Lee, Jaemin) 한국방재학회 2021 한국방재학회논문집 Vol.21 No.5
도시 구조의 고도화 및 인구 집중화로 인하여 초고층 건물이 지속적으로 건설되고 있고 초고층 건물에 비상 상황 발생시 대피 안전성을 사전에 예측해야하는 필요성 증대되고 있다. 그러나 현재 국내외의 연구에서는 대피 상황에서의 인간의 이동에만 초점을 맞추어 최종 대피시간을 예측하고 있다. 따라서 본 연구에서는 현실적인 초고층 대피 시뮬레이션을 위하여 대피자의 체력 감소와 같은 인간 특성이 반영된 대피 시뮬레이션을 제안하고자 한다. 대피 시뮬레이션은 세계 최고의 초고층 건물인 Burj Khalifa을 대상으로 수행하였으며 체력 감소를 고려한 경우와 고려하지 않은 경우에 대하여 비교 검증을 수행하였다. 시뮬레이션을 수행한 결과 체력 감소를 고려한 경우에 체력 감소를 고려하지 않은 경우보다 총 대피 시간이 현저하게 증가함이 확인되었다. 인간의 체력 감소를 초고층 건물 대피 시뮬레이션에 적용하면 현실적인 대피 예측이 가능할 것으로 판단된다. Currently, high-rise buildings are being continuously constructed, and thus, it is necessary to predict evacuation safety in advance in case of emergency situations in high-rise buildings. However, current studies focus only on the movement of individuals in evacuation situations for predicting the final evacuation time. Therefore, in this study, a simulation of realistic evacuation in high-rise buildings was performed based on characteristics such as the physical stamina of evacuees. The evacuation simulation was performed on the world s tallest high-rise building, Burj Khalifa, and comparative verification was performed with and without consideration of the physical stamina of evacuees. The results of the simulation indicated that the total evacuation time significantly increases when physical stamina is considered. Hence, realistic evacuation in high-rise buildings is possible when the stamina of evacuees is considered.
RCS/ISAR를 이용한 레이다 표적분석 기법 및 소프트웨어 개발
권경일,유지희,정명수,윤태환,Kwon Kyoung-IL,Yoo Ji-Hee,Chung Myung-Soo,Yoon Taehwan 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.2
A development of a software on radar target signature analysis is presented in this paper The target signature includes Radar Cross Section(RCS) prediction, Range Profile(RP) processing and Inverse Synthetic Aperture Radar(ISAR) processing. Physical Optics(PO) is the basic calculation method for RCS prediction and Geometrical Optics(GO) is used for ray tracing in the field calculation of multiple reflection. For RP and ISAR, Fast Fourier Transform(FFT) and Matrix Pencil(MP) method were implemented for post-processing. Those results are integrated into two separate softwares named as Radar Target Signature Generator(RTSG) and Radar Target Signature Analyser(RTSA). Several test results show good performances in radar signature prediction and analysis.
SEP를 이용한 헬기와 지상부대 간 전술데이터링크체계 구현
정재형,권태환,권용수,Jeong, Jaehyung,Kwon, Taehwan,Kwon, Yongsoo 한국시스템엔지니어링학회 2005 시스템엔지니어링학술지 Vol.1 No.1
The Tactical Data Link System(TDLS) is a standardized communication link to exchange and interface positional, situational information, command and control in real time. It has been evalua ted that the link would play an important role for tactical interoperability, situation awareness, and execution of joint operations in the future war. But considering the rapidly changing war situations, even though being admitted the necessity of the TDLS of Army helicopter, one of superpowers in the Army, it is not yet built the detailed operational concept. Therefore, this work presents how to embody the TDLS through the systems engineering approach based on the TDLS operating concept analysis of helicopters-ground units.
고효율 전동기를 다중이용시설 환기설비에 도입하기 위한 LCCA 및 LCA 분석
전준용,최수호,권태환,최혜미,김주형,김재준,Quan, Junlong,Choi, Sooho,Kwon, Taehwan,Choi, Hyemi,Kim, Juhyung,Kim, Jaejun 한국건설관리학회 2015 한국건설관리학회 논문집 Vol.16 No.4
다중이용시설의 환기부문 에너지소비량이 전체 에너지소비에서 차지하는 비중은 약40%로서 상당히 크다. 환기설비분야의 에너지절약방안으로는 주동력원이자 주요에너지소비원인 전동기를 고효율 제품으로 교체하거나 인버터를 이용한 가변운전을 통하여 에너지를 절감시키는 방안이 있다. 그러나 이런 방안들을 도입하기 위해서는 기존설비보다 높은 초기투자비가 필요하므로 장기적인 관점에서의 경제성평가가 요구된다. 경제성평가 방법으로 생애주기동안 지출되는 모든 비용을 예측하는 LCCA(Life Cycle Cost Analysis)가 적절하지만 LCCA는 분석내용이 단순 비용절감측면에 치중되어 있어, 환경영향을 고려하지 못하는 한계가 있다. 환경영향을 분석하기 위한 방법으로 LCA(Life Cycle Assessment)있지만 이는 주로 건축물에만 사용되어왔고 또한 환경적인 측면만 치중하여 경제적은 측면을 고려하지 못하는 한계가 있다. 이에 본 연구에서는 LCCA 및 LCA를 이용해 경제적 측면 및 환경적 영향을 종합적으로 분석하여 다중이용시설 환기설비에 고효율 전동기 도입의 타당성 검토를 진행하고자 한다. The amount of energy consumed in air ventilation systems of public facilities accounts for 40% of their total energy consumption. To reduce their energy consumption, applying variable speed operation controlled by an inverter with a high-efficiency motor is suggested. Since these methods require higher initial investment costs compared to the existing systems, economic evaluation should be conducted from a long-term perspective. While LCCA(Life Cycle Cost Analysis) model is useful to estimate net savings of alternatives that differs with respect to initial costs and operating costs, the environmental burdens are not considered. On the contrary LCA(Life Cycle Assesment) model is suitable to assess environmental impacts associated with the stages of a product's life but it does not consider costs. In this study, the high-efficient motors are introduced into the air ventilation system of a subway station and a comprehensive analysis on the economic and environmental impacts of the proposed method is conducted by using LCCA and LCA model.