신뢰성 해석을 이용한 차량 후드 보강재의 위상최적화

박재용,임민규,오영규,박재용,한석영,Park, Jae-Yong,Im, Min-Kyu,Oh, Young-Kyu,Park, Jae-Yong,Han, Seog-Young 한국생산제조학회 2010 한국생산제조학회지 Vol.25 No.5

Reliability-based topology optimization (RBTO) is to get an optimal topology satisfying uncertainties of design variables. In this study, reliability-based topology optimization method is applied to the inner reinforcement of vehicle's hood based on BESO. A multi-objective topology optimization technique was implemented to obtain optimal topology of the inner reinforcement of the hood. considering the static stiffness of bending and torsion as well as natural frequency. Performance measure approach (PMA), which has probabilistic constraints that are formulated in terms of the reliability index, is adopted to evaluate the probabilistic constraints. To evaluate the obtained optimal topology by RBTO, it is compared with that of DTO of the inner reinforcement of the hood. It is found that the more suitable topology is obtained through RBTO than DTO even though the final volume of RBTO is a little bit larger than that of DTO. From the result, multiobjective optimization technique based on the BESO can be applied very effectively in topology optimization for vehicle's hood reinforcement considering the static stiffness of bending and torsion as well as natural frequency.

부산시 공공도서관의 운영현황 및 발전방향에 관한 연구

박재용,Park, Jae-Yong 한국도서관정보학회 2012 한국도서관정보학회지 Vol.43 No.4

This research is to find a direction of development through operating status survey of public library in Busan metropolitan city. First, Normally library users visit the library to check out books or to have a private study session. Also users normally obtained information about upcoming events done in the library through using offline search methods. Second, although the usage of the website was low, however the users demanded the increase in computer numbers in the library and online database for home access. Third, the users acknowledged the importance of the public library to their local community. Library policy indicator rated high in importance to the local community(m=3.86). However the reference desk(m=2.87), checkout desk(m=2.41), computer availability(m=2.47), as well as up-to-date artifact availability(m=2.64) did not reach the average point of 3.0. Thus, revealing that the public library's management policies were not sufficient enough to satisfy the needs of the library users. 본 연구는 부산시 공공도서관의 운영현황 분석을 통한 향후 발전방향을 도모하기 위한 것이다. 연구결과, 첫째, 일반적 이용현황은 대부분 소설대출이나 개인공부를 목적으로 방문하고, 도서관관련 정보나 행사는 오프라인을 통한 검색이 이루어지고 있었다. 둘째, 온라인서비스사용기간이나 웹사이트 방문빈도는 낮았으나, 컴퓨터 설치확대와 홈엑세스가 가능하도록 하는 온라인DB의 기술개선을 요구하였다. 셋째, 공공도서관에 대한 지역사회의 서비스중요성은 매우 중요하게 인식하고 있었다. 도서관 운영지표 중 지역서비스의 중요성(m=3.86)은 높게 나타났다. 그러나 참고데스크(m=2.87), 체크아웃데스크(m=2.41), 컴퓨터가용성(m=2.47) 및 최신자료유용성(m=2.64)에서는 평균값이 3.0에 미치지 못한 것으로 나타남으로써 공공도서관의 운영정책이 실질이용자의 요구사항을 제대로 반영하지 못한 것으로 나타났다.

특허정보 분석 방법을 이용한 지상무인화 기술 분야 핵심 특허 및 기술 분석

박재용,Park, Jae Yong 한국정보처리학회 2018 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.7 No.5

무인화 기술은 전기, 전자, 기계, 인공지능 기술과 ICT 기술 등 다양한 기술들을 융 복합하는 대표적인 기술이다. 특히 지상 무인화 기술은 군사 분야에서 많은 연구 개발과 발전을 이루고 있으며 활용 영역을 확장하고 있다. 본 연구에서는 특허정보 분석을 위해 새로운 특허정보 분석 방법론을 제시하고, 지상 무인화 기술 관련 특허정보를 본 연구에서 제시한 특허정보 분석 방법을 이용하여 분석하였다. 핵심특허 및 기술을 추출하기 위한 특허정보 분석 프로세스는 6단계로 분석 대상 기술선정, 세부 기술 분류, 특허정보 수집, 특허정보 분석 방법 선정, 특허정보 분석, 마지막으로 핵심특허 및 핵심 기술 추출로 이루어 진다. 세부적으로 지상무인화 기술에 대한 기술 분류를 실시하고, 특허지수인 CPP와 IPC 코드 연결성 분석을 통해 지상 무인화 기술의 핵심기술과 핵심특허를 추출하였다. 제시된 특허정보 분석 방법을 이용한 특허정보 분석 결과는 다양한 분야의 기술에 적용하여 분석이 가능하고, 향후 연구개발 방향을 전망하는 자료로 활용할 수 있다. Unmanned technology is a representative technology that integrates various technologies like electric, electronic, mechanical, artificial intelligence, ICT technology, ect. In special emphasize, ground technology has been developing exponentially in the military field and expanding its utilization area. The patent information analysis method presented in this study, proposes a new patent analysis methodology for patent information analysis and patent information on unmanned ground technology. The patent information analysis processor has 6 levels to extract core patents and technologies. The process consists of: selection of technology to be analyzed, classification of detailed technology / key keyword selection, patent information collection / noise reduction, selection of patent information analysis method, patent information analysis, finally, core patents and key technologies that are extracted. Patent information on unmanned ground technology is also analyzed in this study. First, the technical classification of ground unmanned technology is carried out in detail. The core technology and core patents of ground unmanned technology were extracted through CPP and IPC code connectivity analysis. The results of patent information analysis using proposed patent information analysis method that can be applied to various fields of technology and analysis. These can be used as a material to forecast the direction of future research and development on the technology to be analyzed.

국방 표준/규격 체계 개선방안 연구

박재용,최석철,Park, Jae-Yong,Choi, Seok-Cheol 한국국방경영분석학회 2009 한국국방경영분석학회지 Vol.35 No.1

우리나라의 과학기술은 선진국 수준에 이르고 있지만, 이를 뒷받침하는 표준/규격 분야는 그 수준에 못 미치고 있다. 이를 극복하기 위해서 본 연구에서는 미국 규격체계의 발전 동향과 우리나라의 국가표준(KS, KlCS) 및 국내민간 규격체계에 대해서 살펴보았다. 이를 바탕으로 국내 국방 표준/규격 체계의 현 실태를 분석하고 3가지 측면에서 개선방안을 제시하였다. 첫째, 국방표준 분류체계 분야에서는 국방 분야에서 표준, 규격, 핸드북을 명확하게 정의하고 국방 표준과 국방 핸드북의 제정대상을 식별하였다. 둘째, 국방표준 제정절차 분야에서는 민간주도(상향식)형의 표준/규격 제정절차를 제시하였고, 마지막으로 '국방규격작성 표준지침' 분야에서는 국방 표준, 규격, 핸드북의 표기법 및 현재 도면번호 체계의 한계를 극복할 수 있는 개선안을 제시하였다. Recently, the level of science and technology in our country has reached the level of the advanced countries. However, the level of standards/specifications was insufficient for support. In this study, after a review of the international atmosphere on defense specifications/standards and an investigation of the domestic present situation, three different perspectives of improvement scheme for the defense specifications/standard system are presented. First, in the defense standard classification system perspective, specifications, standards and handbook were defined based on their characteristic and properties. Second, in the perspective concerning the establishment procedure of defense standards/specifications, the bottom-up approach was suggested. Finally, in the perspective of the 'defense standards/specifications instructions', a reinforced drawing number system and other factors to overcome the current limitations are provided.

의료인력(醫療人力)의 지역간(地域間) 분포양상(分布樣相)과 결정요인(決定要因)

박재용,Park, Jae-Yong 한국개발연구원 1983 韓國 開發 硏究 Vol.5 No.2

항해중 선원의 상병 및 치료양상

박재용,전정원,Park, Jae-Yong,Jun, Jung-Won 대한예방의학회 1989 Journal of Preventive Medicine and Public Health Vol.22 No.1

The purpose of this study was to find out morbidity rate and utilization pattern of medical services of sailors on a voyage. The subjects of this study were 470 sailors who are sailors' trainee and safety-trainee for embarkation in a ship. Data were collected by means of personal survey conducted from September 5 to October 30, 1988. The subjects were sailed 12.6 months on the average. During the voyage, 49.4% of the sailors had sickness more than once, and 24.7% was unable to work more than a day because of illness. The average monthly morbidity rate was 85.7 per 1,000 and the monthly prevalence rate of disease that was unable to work more than a day was 21.2 per 1,000. The sailors of 40-49 years old had the highest morbidity rate of 103.6 per 1,000/month. The number of days activity restricted due to sickness was 93.4 days per 1,000 persons, and the average duration of illness was 11.2 days per sickness. The proportion of treatment days to sickness days was 48.8%. Considering morbidity unable to work more than a day, the number of those who had traumatic injury were 17.2%, which revealed the highest rate, influenza or cold were 15.5%, and the digestive disease 11.2%. Less than half(42.1%) of patients were treated with medicine kept in the cabin. However, 2.1% was transferred by helicopter and 29.5% was treated at hospitals or clinics in nearby port. In the cabin, 67.4% of patients was cured completely.

계열별 프로그래밍 언어의 활용도에 관한 차이분석 -경영계열을 중심으로-

박재용,Park Jae-Yong 대한경영정보학회 1998 경영과 정보연구 Vol.2 No.-

The purpose of this study was to analyze the differences of application level the computer programming languages in major. The method of this study is the empirical method based on theoretical one with the previous bibliographical suduies. The sample consists of 268 listed university disclosing over the period of Dec. 1. 1997 to Du. 15. 1997. The samples were 10 university in university of Seoul, Pusan, Masan City, Korea. The data were collected by questionnaire research through interview with each person. The analysis data was carried to 268 samples by using SPSS/PC for Windows Version 7.5 statistical package. Statistical methods such as frequency analysis, chi-square test, ANOVA test, correlation analysis were used to test the research questions. This paper focuses on the design of the hypothesis test show that the 2 type are significantly different in major of university students. Before the test of research questions performed it frequency analysis by using the factor score that bring each items. The research type of 2 guoups, that is, BA Group(business administration group) and NBA Group(non-business administration guoup). To summarize the result of this study is as follows ; (1) Hypothesis 1 : Concerning about computer programming language in major, the significant difference is application the present condition. (2) Hypothesis 2 : Concerning about computer programming language in major, the significant difference is application level. (3) Hypothesis 3 : Concerning about each application software in major, the significant difference is application level. According to the results of this study, it is found that (1) Hypothesis 1 related In application the present condition of computer programming language was accepted its all at 0.05 % significance level. (2) Hypothesis 2 related to application level of computer programming language was accepted its all at 0.05 % significance level. (3) Hypothesis 3 related to application level of each application software was rejected its all. at 0.05 % significance level.

도시 가계의료비 지출의 추이와 예측

박재용,남시현,Park, Jae-Yong,Nam, Si-Hyun 대한예방의학회 1995 예방의학회지 Vol.28 No.2

The increase of health care expenditures is an important problem in the almost countries. Also, suppression of the health care expenditures is an important problem in the health field of Korea since the national health insurance for total people in 1989. Thus, it is very important to grasp the change of the health care expenditures of family and proportions of the health care expenditures to total expenditures of family, because they are the basis of national health care expenditures in Korea. While the health care expenditures of urban family were increased during 1980-1993 by 12.8% annually, the total expenditures of urban family were increased by 14.8% annually. Consequently, the proportions of health care expenditures to total expenditures were decreased from 5.98% to 4.76%. The proportions of health care expenditure for 3 years to come were predicted to 4.75% in 1994, 4.67% in 1995, and 4.63% in 1996 by the time-series analysis. That is, it was predicted that they would be decreasing slowly. The product elasticity of health care expenditure was less than 1 in the multiple regression analysis. so the health care is normal good rather than superior good. Therefore, it seems that the household economy is able to bear the expense pursuing the improvement of quality of health care by actualizing the medical insurance fee.

스티칭에 의한 유리섬유강화 복합재료의 물성 및 충격거동 변화

박재용,강태진,육종일,Park, Jae-Yong,Kang, Tae-Jin,Yuk, Jong-Il 한국재료학회 1992 한국재료학회지 Vol.2 No.5

Mechanical and impact properties of stitched S2 glass fiber reinforced polyester woven laminates composites have been studied. Laminates were stitched using Kevlar 49 thread with 1/2, 1, and 2 inch stitch spacing. Tensile and 3-point bending tests haute been performed to evaluate the mechanical properties of stitched and unstitched laminates. Impact tests at applied energy of 234.7J were performed to examine the impact behavior and toughness changes of the specimen. The same specimens were also tested repeatedly at low impact energy level of 110.2J for 3 times to evaluate damage tolerance properties. The tensile and 3-point bending test results showed that one inch spacing specimen had the highest tensile and flexural strength. It also showed the highest energy absorption capability and the best damage tolerance property at the repeated impact test. The half inch spacing specimen showed the lowest tensile strength and energy absorption property at the impact energy level of 234.7J, even though it had the highest frequency of stitching thread. S-2유리섬유직물과 폴리에스터 수지로 구성된 적충복합재료를 케블라 49 Thread로 1/2인치, 1인치 2인치 간격으로 스티칭하여 스티칭 간격에 따른 물성과 충격 강도의 변화로부터 최적스티칭 조건을 구하였으며 또한 스티칭하지 않은 적층복합재료와의 물성차를 비교연구하였다. 인장실험과 3점굽힘실험을 통해 시편의 종류별 기본 물성을 알아보았고, 234.7J의 충격에너지를 가해 시편의 파단 현상과 에너지 흡수 능력을 조사하였다. 파단에너지의 약 50% 정도인 110.2J의 충격에너지로 3회 반복실험하여 시편의 손상정도와 충격강도를 비교 검토하였다. 인장실험과 굽힘 실험의 결과 1인치 간격으로 스티칭한 시편이 가장 높은 강도를 보였으며, 충격실험에서도 가장 뛰어난 에너지 흡수능력 및 손상에 대한 저항을 보였다. 반복충격 실험의 결과 스티칭하지 않은 시편은 현저한 충격강도의 감소를 보인 반면 스티칭한 시편은 반복충격에도 에너지 흡수능력이 우수하게 유지되었다. C-scanning으로 손상부위를 관찰한 결과 스티칭으로 인해 손상영역의 확산이 억제되어 현저히 감소함을 보여주었다. 스티칭 간격이 너무 조밀한 경우 강도의 향상보다는 스티칭으로 인한 손상이 더 커져서 1/2인치 간격으로 스티팅한 시편의 경우는 인장강력이나 충격에너지 흡수가 스티칭하지 않은 시편에 비해 오히려 감소하는 결과를 나타내었다. 그러나 이러한 감소에도 불구하고 외부충격에 의한 손상영역의 확산은 효과적으로 억제되어 국부적인 손상만이 발생함을 알 수 있었다.

3차진료기관(3次診療機關)과 환자의뢰기관간(患者依賴機關間)의 중복검사(重複檢査)

박재용,김귀영,Park, Jae-Yong,Kim, Gui-Young 대한예방의학회 1993 예방의학회지 Vol.26 No.3

본 연구는 1차 의료기관과 3차 진료기관의 검사 내용 및 이들 간의 중복검사율을 파악할 목적으로 대구직할시내 1개 3차 진료기관에 1992년 3월 16일부터 4월 11일까지 진료의뢰서를 갖고 내과, 일반외과, 정형외과, 신경외과 외래를 방문한 초진환자 498명을 대상으로 설문지 및 의무기록을 통해 조사하였는데 그 결과를 요약하면 다음과 같다. 대상자는 3차 진료기관이 속한 중진료권에 거주하는 환자가 48.8%였고 나머지가 대진료권에 속한 환자였으며, 1차 의료기관의 방문목적이 진단과 치료를 위해서 방문한 경우가 74.1%였고 진료의뢰서를 발급받기 위해서가 25.9%였다. 진료의뢰서를 본인이 원해 발급받은 경우가 전체의 52.6%였는데 순수하게 의사의 판단에 의해 발급받은 환자가 47.4%로서 아직도 환자 의뢰체계가 제대로 완비되었다고 말하기 어렵다. 진료의뢰서의 발급기관은 의원급이 67.5%, 병원급이 16.3%, 보건기관이 14.2%였다. 1차 의료기관에서 검사를 하고 3차 진료기관을 방문한 환자는 49.4%였는데, 이 중에서 진료한 1차 의료기관에서 다른 진료기관으로 검사를 의뢰해서 검사를 실시한 경우가 7.8%였다. 1차 의료기관에서는 대상자의 20.9%가 X-ray 검사를 받았고, 10.6%가 소변검사, 9.0%가 심전도검사를 받았으며, 의료보험 비급여 대상종목인 컴퓨터단층촬영과 초음파검사는 각각 3.4%, 6.4%였다. 3차 진료기관에서도 방문환자의 45.2%가 X-ray 검사를 받았고, 간기능검사 24.7%, 소변검사 19.1%, 심전도검사 15.7%의 순으로 나타났다. 1차 의료기관에서 검사를 받은 사람 중 검사결과지를 지참한 환자의 비율은 컴퓨터단층촬영이 76.5%로 가장 많았고, 다음이 초음파검사로 31.3%여서 고가 의료장비 이용시 검사결과지 지참율이 높았다. 1차 의료기관과 3차 진료기관에서의 중복검사율은 각 진료과에 따라 특성이 있으나 전체적으로 보면 갑상선 기능검사가 71.4%로 가장 높았고, 다음이 혈액검사(Routine CBC)가 67.9%, X-ray검사가 64.4%였다. 그리고 초음파검사 62.5%, 컴퓨터단층촬영 11.8%, 심전도검사 35.6%, 위내시경검사 45.2%였다. 1차 의료기관에서의 검사결과지를 지참한 경우만을 기준으로 하면 혈액 검사가 75.0%, 간기능검사가 72.7%로 높았으나 X-ray 52.2%, 초음파검사 60.0%였는데, 고가장비인 컴퓨터 단층촬영은 15.4%였다. 이상의 결과에서 3차 진료기관에서는 1차 의료기관에서 실시한 검사를 중복검사한 경우가 많고 1차 의료기관에서의 검사결과지를 지참하는 환자의 중복검사율도 특수한 경우를 제외하고는 큰 차이가 없었음을 감안할 때 진료의뢰시 보다 상세한 진료결과지를 지참하도록 하는 등 환자의뢰체계를 합리적으로 개선하여야 확인검사로 인한 중복검사를 경감시킬 수 있을 것으로 생각된다. 아울러 불필요한 검사를 줄이기 위해서는 의료분쟁을 줄일 수 있는 방안이 마련되어야 하고, 의료보험수가의 조정도 필요할 것이다. This study was conducted to investigate the repeat test rate for diagnosis at a tertiary hospital for the outpatients who were referred themselves to the hospital by the clinics and other medical facilities. The study population consisted of 498 patients who visited outpatient department of internal medicine, general surgery, orthopedic surgery and neurosurgery in the hospital between March 16 and April 11, 1992. This study was surveyed by the questionnaire about the tests for diagnosis at first level medical facilities, and then, was investigated by the medical record about the tests for diagnosis at a tertiary hospital. The proportion of test among the patients who utilized the first level medical facilities was 20.9% for the X-ray test, 10.6% for the urinalysis, 9.0% for the electrocardiogram, 3.4% for the computer tomogram and 6.4% for the ultrasonogram. At the tertiary hospital, the X-ray test was 45.2%, the liver function test was 24.1%, the urinalysis was 19.1%, and the electrocardiogram was 15.7%. The proportion of patients who possessed results of test for diagnosis at the first level medical facilities was 76.5% for the computer tomogram, and 31.3% for the ultrasonogram. As the repeat test rate between the first level medical facilities and the tertiary hospital, the thyroid function test was the first rank as 71.4%, the second rank was the routine CBC as 67.9%, and the third rank was the X-ray test as 64.4%. But among the patients that brought the result for tests at the first level medical facilities, the repeat test rate was as follow : the routine CBC was 75.0%, the liver function test was 72.1%, and the computer tomogram was 15.4%.