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조용무(Cho Yong Moo) 한국통신학회 2009 한국통신학회 학술대회논문집 Vol.2009 No.11
통신, 네트워크 환경 및 시장 변화에 빠르게 대처하기 위해 장비 제조업체는 표준에 기반한 ecosystem 을 사용하여 개발하려고 하고 있다. 하드웨어의 경우 PICMG 의 표준인 ATCA, 운영체계의 경우 Linux, 고가용성 미들웨어의 경우 SA Forum 표준에 근간한 제품을 사용하는 것이 현재 추세이다. 본 논문에서는 SA Forum 의 AIS 에 기반을 두고 공개 소스 형태로 개발 중인 고가용성 미들웨어인 OpenAIS, OpenClovis 및 OpenSAF 의 동향과 각 제품별 특징을 비교해 본다.
스마트폰 카메라용 VCM housing 사출 성형 해석
윤선진,조용무,Yoon, Seon Jhin,Cho, Yong Moo 한국금형공학회 2017 한국금형공학회지 Vol.11 No.3
The injection molding analysis of VCM (Voice Coil Motor) housing for smart phone cameras were performed. We conducted the analysis in terms of injection molding pressure, the formation of weld lines, flow marks, and flow patterns. The goal of the analysis was targeted for the prediction of the optimal gate locations. Because the quality of VCM housing is strongly dependent on the precise control of the camera lens by its nature, we focused on the lens guiding lanes in the VCM housing. We first calculated the maximum injection molding pressure in terms of the filled volumes. The injection molding pressure were calculated within 146MPa at about 90% volume filled. We also investigated the possibility of the occurrence of design-related defects such flow marks, weld lines. Filling patterns regarding the design of the gate locations were delineated to find the weld lines. Throughout the simulations, the final deformations of the lens guiding lanes for the VCM housing were calculated. The deformations distribute ranging from $0.5{\mu}m$ to $2.50{\mu}m$, which were used to find the optimal design of the gates.
자동차 토크앵글센서(TAS)의 평면 정밀도에 관한 연구
윤선진,조용무,Yoon, Sean-Jhin,Cho, Yong-Moo 한국금형공학회 2018 한국금형공학회지 Vol.12 No.2
In this study, we proposed three analysis methods to calculate the flatness of torque-angle sensors (TAS). We introduced two statistical and one geometrical methods in evaluating the precision of the flat plane in the axis direction for TAS. To verified the results, we fabricated TAS and a reference sample using a injection molding machine, mold, polyester as a raw material. We measured ($x_i$, $y_i$) position using 3D contact automated system and applied three analysis methods developed for TAS and a reference sample to see the feasibility. While each analysis method has its own pros and cons, the analysis using the shortest optimal distance was the most precise technique for the flatness evaluation of TAS components.
고온 환경하 응력 확산에 의한 금속시편내 격자결함 재분포
윤선진,조용무,Yoon, Seon-Jhin,Cho, Yong-Moo 한국금형공학회 2018 한국금형공학회지 Vol.12 No.1
In this study, we calculated the redistribution of vacancy concentration in metal specimens induced by stress-induced diffusion at a high temperature. To deduce the governing equation, we associated the unit volume change equation of strains with a differential equation of vacancy concentration as a function of stress using the stress-strain relationship. In this governing equation, we considered stress as the only chemical potential parameter to stay in the scope of this study, which provided the vacancy concentration equation as of stress gradient in metals. The equation was then mathematically delineated to derive a analytical solution for a transient, one-dimensional diffusion case. With the help of Korhonen's approximation and the boundary conditions, we successfully deduced a general solution from the governing equation. To visualize the feasibility of our solutions, we applied the solution to two different stress-induced cases - a rod with fixed concentrated stresses at both ends and a rod with varying concentrated stresses at both ends. Although it is necessary to legitimatized the model in the future for improvement, our results showed that the model can be used to interpret the location of structural defects, the formation of vacancy, and furthermore the high temperature behavior of metals.
趙鏞武 서울大學校 保健大學院 1970 公衆保健雜誌 Vol.7 No.1
From August 1 to September 31, 1969, surveys were conducted on the legal minimum work volume and the appointment status of the 224 medical inspectors assigned to inspect the 11,050 medical institutious in this country. Through the analysis of data thus collected, the following result were achieved: 1. The average number of hours actually available for personal inspection by each medical inspector in cities was calculated as three hours and 10 minutes daily out of his eight work hours, and that by each medical inspector in Kun(country) as two hours. 2. Out of the total number of days available for inspection each year, 227 days (62.2 per cent of the total number of days in a year), 150 days(66 per cent) were actually available for inspection by medical supervisors in cities and only 80 days(35.7 per cent) for inspection by medical inspectors in Kun. Therefore, each medical inspector could supervise 343 medical institutions in cities and 68 in Kun. 3. As the result of comparison between the total legal minimum manpower requirement for medical inspectors and the number of assigned medical supervisors, the excess of shortage of assigned inspectors was discovered as follows: (Unit: persons) Area Excess or shortage City Country Seoul -29 Pusan -5 Kyonggi -4.5 -37.11 Kangwon -1.3 -14.2 N. Ch'ungch'ong 0.4 -11.4 S. Ch'ungch'ong -1.3 -27 N. Cholla -1.3 -11.3 S. Cholla -3.7 -15.3 N. Kyongsang -7.4 -23.2 S. Kyongsang -2.2 -18.1 Cheju 0.5 -1.3 4. Out of a total of 4,595 cases of illegal medical practices uncovered by medical inspectors, 1,643 cases or 35.7 per cent, the greatest proportion, accounted for unlicensed medical practitioners. 5. As for the qualification of incumbent medical inspectors, only 33 of them or 14.7 per cent were appointed on the temporary but full-time basis while 181 or 82.9 per cent were on the regular but part time basis conducting medical supervision as frequently as required while performing other medical administration.