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윤재백(Jae Baek Yoon),박병훈(Byung Hun Park),나유나(Yu Na Na) 한국사회체육학회 2011 한국사회체육학회지 Vol.0 No.45
The study aims to develop the scaling measure of stress factor for horse riding jockeys by conducting an open question pilot survey for jockeys with more than one year of horse riding experience and sufficient understanding on horse riding, which led finally to the adoption of 45 question items. Through this process, the author undertook factor analysis, internal consistency analysis, correlation analysis between sub-categories of stress factor, and confirmatory factor analysis and reviewed in a comprehensive manner, which revealed that 11 questions were excluded due to conceptual and statistical problems among 45 question items, and thus 34 question items from 7 factors were adopted as stress factors for horse riding jockeys. The measurement instrument for stress of jockeys was found to be satisfactory in terms of reliability estimated against consistence and stability for 34 questions. That is, the internal consistency was estimated to be between .84 and .95, and the number of questions for each factor category was between 3 and 8 in average. If the number of questions for each factor was higher, it would be necessary to find out more appropriate questions in further study in case where the increase in reliability coefficient is predicted.
금속 3D 프린팅 공정 최적화를 통한 H13 공구강 조형체의 기계적 특성 향상
윤재철,최중호,이행나,김기봉,양상선,양동열,김용진,이창우,유지훈,Yun, Jaecheol,Choe, Jungho,Lee, Haengna,Kim, Ki-Bong,Yang, Sangsun,Yang, Dong-Yeol,Kim, Yong-Jin,Lee, Chang-Woo,Yu, Ji-Hun 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.3
In this study, H13 tool steel sculptures are built by a metal 3D printing process at various laser scan speeds. The properties of commercial H13 tool steel powders are confirmed for the metal 3D printing process used: powder bed fusion (PBF), which is a selective laser melting (SLM) process. Commercial H13 powder has an excellent flowability of 16.68 s/50 g with a Hausner ratio of 1.25 and a density of $7.68g/cm^3$. The sculptures are built with dimensions of $10{\times}10{\times}10mm^3$ in size using commercial H13 tool steel powder. The density measured by the Archimedes method is $7.64g/cm^3$, similar to the powder density of $7.68g/cm^3$. The hardness is measured by Rockwell hardness equipment 5 times to obtain a mean value of 54.28 HRC. The optimum process conditions in order to build the sculptures are a laser power of 90 W, a layer thickness of $25{\mu}m$, an overlap of 30%, and a laser scan speed of 200 mm/s.
SLM 공정으로 제작된 SKD61 공구강의 조형 특성에 관한 연구
윤재철,최중호,김기봉,양상선,양동열,김용진,이창우,유지훈,Yun, Jaecheol,Choe, Jungho,Kim, Ki-Bong,Yang, Sangsun,Yang, Dong-Yeol,Kim, Yong-Jin,Lee, Chang-Woo,Yu, Ji-Hun 한국분말야금학회 2018 한국분말재료학회지 (KPMI) Vol.25 No.2
In this study, two types of SKD61 tool-steel samples are built by a selective laser melting (SLM) process using the different laser scan speeds. The characteristics of two kinds of SKD61 tool-steel powders used in the SLM process are evaluated. Commercial SKD61 tool-steel power has a flowability of 16.68 sec/50 g and its Hausner ratio is calculated to be 1.25 by apparent and tapped density. Also, the fabricated SKD61 tool steel powder fabricated by a gas atomization process has a flowability of 21.3 sec/50 g and its Hausner ratio is calculated to be 1.18. Therefore, we confirmed that the two powders used in this study have excellent flowability. Samples are fabricated to measure mechanical properties. The highest densities of the SKD61 tool-steel samples, fabricated under the same conditions, are $7.734g/cm^3$ (using commercial SKD61 powder) and $7.652g/cm^3$ (using fabricated SKD61 powder), measured with Archimedes method. Hardness is measured by Rockwell hardness testing equipment 5 times and the highest hardnesses of the samples are 54.56 HRC (commercial powder) and 52.62 HRC (fabricated powder). Also, the measured tensile strengths are approximately 1,721 MPa (commercial SKD61 powder) and 1,552 MPa (fabricated SKD61 powder), respectively.
항공등화 ILCMS 시스템 및 개별등화 제어기 원격 업그레이드 방법
윤재식(Jae-Shik Yoon),원동선(Dong-Sun Won),유태윤(Tae-Yoon Yu),한광수(Kwang-Soo Han) 대한전기학회 2014 정보 및 제어 심포지엄 논문집 Vol.2014 No.10
In order to realize the individual control and monitoring in airfield light systems, due to high installation and maintenance cost for the additional control line, PLC(power line communication) technology was applied and adopted for controlling Airfield light. The ILCMS(Individual Light Control and Monitoring System) is suitable for individual switching and monitoring of airfield lighting in order to meet latest ICAO(International Civil Aviation Organization) and FAA(Federal Aviation Authority) recommendations, to enhance safety of aircraft ground movement in aerodrome and to built up the basis for an A-SMGCS(Advanced Surface Movement Guidance and Control System). In this paper, this is the method of remote firmware upgrade for individual light controller in airport ILCMS system.
개방형 건축시스템을 적용한 통합형 초등학교의 설계에 관한 연구
YU PAI,윤재신(Yoon, Chae-Shin) 대한건축학회 2017 대한건축학회 학술발표대회 논문집 Vol.37 No.2
The purpose of this study is according to the status quo of Chinese education, like inequality of distributing of school, lack of teacher resource, to encourage the establish of small-scale schools. Making open house rebuild to small-scale school is one of the solutions. And take example of VARIATION which was written by Habraken, use SAR as the theory basis in design program. It is hoped that the result of this study will give some reference value in school remodeling program.
장유정(Yu-Jung Jang),윤재관(Jae-Kwan Yun),한기준(Ki-Joon Han) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ
최근에 무선 인터넷과 이동 컴퓨팅 기술이 발전하고, 휴대 전화와 PDA 같은 이동 단말기가 보편화됨에 따라 사용자의 위치정보를 활용한 위치 기반 서비스(LBS: Location Based Services)가 가능하게 되었다. 위치 기반 서비스를 제공하기 위해서는 대용량의 위치 데이타를 신속하게 처리하고 관리하기 위한 시스템이 필요하다. 이에 본 논문에서는 위치 데이타를 효과적으로 분산 저장 및 검색할 수 있는 이동 객체를 위한 분산 위치 저장 컴포넌트를 구현하고 그 성능을 평가하였다. 분산 위치 저장 컴포넌트는 위치 데이타를 저장하고 검색하는 미들웨어, 분산된 미들웨어의 정보를 관리하는 서버 관리자, 빠른 검색을 위해 위치 데이타의 인덱스 정보를 관리하여 검색할 서버의 정보를 반환하는 연결 관리자, 서버의 디스크 상태를 확인하고 디스크 사용을 관리하는 디스크 관리자, 그리고 클라이언트로 구성된다.
오피니언 마이닝을 이용한 블로그/SNS 에서 익명 사용자의 직업 예측
유전국 ( Yu Jeun Kuk ),윤재열 ( Jae Yeol Yoon ),김응모 ( Ung-mo Kim ) 한국정보처리학회 2011 한국정보처리학회 학술대회논문집 Vol.18 No.2
최근 Blog/SNS가 새로운 커뮤니케이션 도구로 정착이 되면서 지위 고하를 막론하고 많은 사람들이 자신의 의견을 인터넷 상에 표현을 하고 있다. 이러한 많은 의견들은 다른 사람들과 의견을 교환하는 역할도 하고 있으나 여기에 신뢰할 수 없는 부정확한 정보 또한 다수 포함 되어 있다. 본 논문에서는 Blog/SNS의 익명의 사용자 직업을 추측하여 이용자로 하여금 이러한 부정확한 정보를 판단할 수 있는 하나의 수단과 이용의 판단에 근거를 제시한다. 이러한 방법을 통해 사용자는 무수한 정보들 속에서 신뢰성 있는 정보와 신뢰성이 없는 정보를 보다 정확하게 판단 할 수 있을 것이다.
강전연,윤재철,김호영,김병환,최중호,양상선,유지훈,김용진,Kang, Jun-Yun,Yun, Jaecheol,Kim, Hoyoung,Kim, Byunghwan,Choe, Jungho,Yang, Sangsun,Yu, Ji-Hun,Kim, Yong-Jin 한국분말야금학회 2017 한국분말재료학회지 (KPMI) Vol.24 No.3
A cold-work tool steel powder is used to fabricate 3-dimensional objects by selective laser melting using a high-pressure gas atomization process. The spherical powder particles form continuous carbide networks among the austenite matrix and its decomposition products. The carbides comprise Nb-rich MC and Mo-rich $M_2C$. In the SLM process, the process parameters such as the laser power (90 W), layer thickness ($25{\mu}m$), and hatch spacing ($80{\mu}m$) are kept fixed, while the scan speed is changed from 50 mm/s to 4000 mm/s. At a low scan speed of 50 mm/s, spherical cavities develop due to over melting, while they are substantially reduced on increasing the speed to 2000 mm/s. The carbide network spacing decreases with increasing speed. At an excessively high speed of 4000 mm/s, long and irregularly shaped cavities are developed due to incomplete melting. The influence of the scan pattern is examined, for which $1{\times}1 mm^2$ blocks constituting a processing layer are irradiated in a random sequence. This island-type pattern exhibits the same effect as that of a low scan speed. Post processing of an object using hot isostatic pressing leads to a great reduction in the porosity but causes coarsening of the microstructure.