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.

Fe , Cr , Mn , Si , Ni 의 첨가에 의한 고력황동의 미세조직과 마모특성

박재용,강춘식,신윤호,배정찬 ( Jae Yong Park,Choon Sik Kang,Yun Ho Shin,Jeong Chan Bae ) 한국주조공학회 1997 한국주조공학회지 Vol.17 No.3

조제분유에서 프리바이오틱스(prebiotics) 첨가 효과와 가능성

박재용,Park, Jae-Yong 한국축산식품학회 2015 축산식품과학과 산업 Vol.4 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.

만성 족관절 불안정증에서 건이식을 이용한 외측 인대 재건술의 적응증

박재용,최기원,조재호,강찬,최경진,정진화,김학준,배서영,차승도,김기천,한승환,2015 대한족부족관절학회 보험장애판정위원회,Park, Jae Yong,Choi, Gi-Won,Cho, Jae-ho,Kang, Chan,Choi, Kyungjin,Chung, Jin-Wha,Kim, Hak Jun,Bae, Su-Young,Cha, Seung-Do,Kim, Ki Ch 대한족부족관절학회 2016 대한족부족관절학회지 Vol.20 No.1

Purpose: The purpose of this study is to review the indications of ankle lateral complex reconstruction using tendon graft. Materials and Methods: We searched PubMed using the index, "ankle, instability, lateral ligament, reconstruction" from 1990 to present (September 30, 2015). We excluded 1) modified Brőstrom operation (MBO), 2) conventional tenodesis surgery, 3) review article, 4) technical note, and 5) articles written in another foreign language. We reviewed 24 papers through the publication events, operational method, the indications of surgery, and the specific features of the patient group. Results: There were the indications of 1) previous ligament surgery failure, 2) situation when ligament repair is impossible due to the ligament defect, 3) severe instability (preoperative talar tilt >$15^{\circ}$, anterior draw >10 mm or the difference of contralateral side talar tilt >$5^{\circ}$, anterior draw >3 mm), and 4) overweight (body mass index >$30kg/m^2$). Other considerations included 1) generalized joint laxity and 2) workers, highly-demanded or athlete highly-affected by instability. Conclusion: The ankle lateral complex reconstruction using tendon graft could be indicated in patients with the possibility of MBO failure with several considerations.

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.

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%.

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

한국인에서 알파 1-항트럽신의 유전형

박재용,최진은,차승익,배낙천,채포희,이재욱,강영모,김창호,정태훈,Park, Jae-Yong,Choi, Jin-Eun,Cha, Seung-Ick,Bae, Nack-Cheon,Chae, Po-Hee,Lee, Jae-Yook,Kang, Young-Mo,Kim, Chang-Ho,Jung, Tae-Hoon 대한결핵및호흡기학회 2001 Tuberculosis and Respiratory Diseases Vol.50 No.2

연구배경 : 폐기종은 대개 흡연의 결과로 생기나 1-2%에서는 ${\alpha}_1$-antitrypsin (A1AT)의 유전적 결핍으로 인해 발병한다. A1AT의 유전적 이형에 대한 연구는 주로 서구인을 대상으로 한 것으로 저자들은 정상 한국인에서 A1AT의 유전형(genotype)을 알아보고자 하였다. 방 법 : 1998년 1월부터 2000년 5월까지 경북대학교병원 건강검진센타 방문자 가운데 문진, 흉부단순촬영, 폐기능검사 등을 통하여 만성폐쇄성폐질환 및 천식등이 없는 정상인 380명을 대상으로 하였다. A1AT의 M1(Ala), M1(Val), M2, S, Z alleles에 대한 중합효소 연쇄반응(PCR) 및 restriction fragment length polymorphism (RFLP)를 시행하였다. 결 과 : A1AT 유전형의 빈도는 M1(Val)/M1(Val)형이 254예 (66.8%)로 가장 많았으며 M1(Val)/M2형 105예(27.6%), M2/M2형 19예 (5.0%), M1(Val)/M1(ala)형 2예 (0.5%) 순 이었다. 연령, 성별, 흡연력에 따른 유전자형의 분포도는 유의한 차이가 없었다. 결 론 : 한국인에서는 A1AT 결핍과 관련이 있는 유전형을 갖는 사람은 없거나 매우 드물 것으로 생각된다. 따라서 한국인에서는 A1AT 결핍 외의 다른 유전적 요소가 폐기종의 발병에 관여할 것으로 생각된다. Background : Alpha-1-antitrypsin (A1AT) deficiency is the only established genetic risk factor for emphysema. This study was undertaken to investigate the prevalence of the genotypes of A1AT genotypes in healthy Koreans. Method : The study population consisted of 380 Healthy Koreans enrolled at the Health Promotion Center in Kyungpook National University Hospital. The polymerase chain reaction (PCR) and restriction fragment length polymorphim (RFLP) for detecting the A1AT variants M1(Ala), M1(Val), M2, S and Z were used. Results : The genotypes of subjects were as follows : M1(Val)/M1(Val), 254(66.8%) ; M1(Val)/M2, 105(27.6%) ; M2/M2, 19 (5.0%) ; and M1(Val)/M1(Ala), 2 (0.5%). There was no case with 'deficiency' alleles such as S and Z found in this study. Conclusion : These results suggest that A1AT deficient alleles are either extremely rare or not present in Koreans.

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.