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정호연(Ho Yeon Chung),이석훈(Suk Hoon Lee),김병호(Byung Ho Kim),이정일(Joung Il Lee),장영운(Young Woon Chang),장린(Rin Chang) 대한내과학회 1989 대한내과학회지 Vol.37 No.4
N/A In order to assess the sensitivity and positive predictive value of ultrasonographic diagnosis of clonor- chiasis, we performed a retrospective analysis of 73 patients who were examined by ultrasonography and stool examination (EPD; Egg per day) and diagnosed as having clonorchiasis by one or both of the above examinations from Jan. 1985 thru Mar. 1987. Forty patients showed positive findings on ultrasonography and stool examination, 26 patients only on stool examination and 7 patients only on ultrasonography. When we acknowledged eggs in the stool as a confirmative diagnosis of clonorchiasis, the sensitivity of ultrasonography was 60.6% and the positive predictive value was 85.1% Thus, abdominal ultrasonography is thought to be a highly reliable method of diagnosis of clonorchiasis, but is inadequate as a screening method for the detection of patients with clonorchiasis.
폐경후 여성에서 경피적 에스트라디올 겔과 경구영 프로게스테론 주기적 병합요법의 임상적 유효성에 관한 연구
정호연 ( Ho Yeon Chung ),최규홍 ( Kyu Hong Choi ),이창욱 ( Chang Uk Lee ),김해성 ( Hae Sung Kim ),임창훈 ( Chang Hoon Yim ),한기옥 ( Ki Ok Han ),장학철 ( Hak Chul Jang ),윤현구 ( Hyun Koo Yoon ),한인권 ( In Kwon Han ) 대한폐경학회 2001 대한폐경학회지 Vol.7 No.1
N/A Objectives: The purpose of our study was to evaluate the effects of transdermal 17β -estradiol gel combined with oral progestogen in terms of serum lipid, bone markers and bone mineral density in Korean postmenopausal women Subjects and methods: Nine healthy postmenopausal women were asked to volunteer for pharmacokinetic analysis of estradiol gel. Subjects received daily application of 1.5 ㎎ of estrogen gel in the morning. Peripheral venous samples were drawn at 0, 0.5, 1, 2, 4, 8, 24, 48, 72 hours after the daily gel application and serum E2 levels were analyzed. 41 postmenopausal women with intact uterus and no menstruation for more than 12 months were treated with 1.5 ㎎ of estradiol gel (day 1-25) sequentially combined with 2.5㎎ of medroxyprogesterone acetate (day 16-25) orally for 1 year. Results: Although one volunteer showed increment of serum E2 one hour after application of estrogen gel, pharmacokinetic study showed increase of serum E2 after 24 hours in the most volunteers. The mean serum E2 level at 72 hour after application was 59.6±58.8 pg/㎖. The acceptability of the combined treatment was 73.2%. Only 1 (3.3%) woman complained skin irritation during treatment. The combined estradiol gel and oral progestogen therapy significantly decreased serum cholesterol levels by 7.8%, LDL by 8.5%. Markers of bone turnover significantly decreased 3 months after treatment. The increase of the annual percent change in bone density was 4.8% at the lumbar spine and 4.4% at the femoral neck. Conclusion: The combined estradiol gel with oral progestogen therapy is acceptable and effective treatment in postmenopausal women.
마찰용접을 이용한 고강도 쇼크업소버 베이스 어셈블리의 제조 기술 개발
정호연(Ho-Yeon Chung) 한국산업경영시스템학회 2011 한국산업경영시스템학회지 Vol.34 No.1
The shock absorber base assembly is one of the parts in the shock absorber equipment that controls the vehicle movement. It absorbs the shock and vibration to guarantee riding stability and comfort. It demands strength, reliability and strict airtightness of the welded section because the shock absorber base assembly is a container which resists pressure and needs durability by being filled with gas and oil. However, the current engineering needs a lot of production time, has a high cost and shows a low production rate. These problem due to the eight production processes, four of which are spot welding, reinforcement welding like metal active welding (MAG), prior process of the base assembly cap and tube for precision and pressing. We will analyze the manufacturing processes of the base assembly and suggest an improved manufacturing method that uses frictional welding. The results will show that the new method of the frictional welding is better than the previous welding technique. Through the use of this concept of frictional welding, the welding conjunction will be strengthened, measurements will be more precise, and the cost and the number of processes will be reduced.
박기철(Ki-Chul Park),정호연(Ho-Yeon Chung) 한국산학기술학회 2021 한국산학기술학회논문지 Vol.22 No.12
TPM(Total Productive Management)에 관한 대부분 선행연구들은 중소기업을 위주로 연구하였고, 기업의 주관적 의견이 많이 반영되는 설문조사에 의한 연구들로, TPM 성과의 검정면에서 대표성과 객관성이 다소 결여 되었다. 따라서, 본 연구에서는 최근 7개년(2014-2020)간 한국표준협회(KSA) 「전국 품질분임조 경진대회 설비(TPM)부문」에 입상한 총 83개 우수기업의 객관적인 실증데이터를 활용하여 연구결과에 대한 신뢰성 높였으며, 다수의 대기업과 중견 기업을 포함한 산업 전반에 대한 대표성 있는 연구로써 선행연구들과 차별성이 있다. 본 연구에서는 분임조 활동의 주요인자(개별개선 건수, 활동기간, 근속년수)와 TPM의 주요 성과(시간가동률, 성능가동률, 설비종합효율)간 유의적인 인과관계를 분석하였으며 다음과 같은 연구결과를 도출하였다. 첫째, 개별개선 건수는 시간가동률(β=.362, p<.001), 설비종합효율(β=.415, p<.001)에 긍정적인 영향력을 미쳤다. 둘째, 활동기간은 시간가동률(β=.328, p<.01), 성능가동률(β=.346, p<.01), 설비종합효율(β=.430, p<.001) 모두에게서 긍정적인 영향력을 미쳤다. 셋째, 근속년수는 시간가동률(β=-.364, p<.01), 성능가동률(β=-.350, p<.01), 설비종합효율(β=-.339, p<.01)에 있어서 부(-)의 영향력을 미치는 것으로 해석되었다. 이는 작업자의 능력이 첨단화되는 설비 발달 속도를 따라가지 못하고, 업무능력을 키우는 데는 시간이 필요하다는 관점과 분임조 구성원의 높은 근속년수는 설비운영 및 현장관리에 있어 기존 관성에 익숙한 반복적 활동이 지속될 가능성을 내포하고 있다. 이러한 연구결과를 바탕으로, 유의적인 분임조 활동요인의 역량강화에 집중하며 TPM 활동성과에 기여 할 수 있는 강력한 도구(Tool)로써 활용하고자 한다. Most of the previous studies on total productive management (TPM) focused on small and mid-size enterprises (SMEs) and were based on surveys that eventually reflected a lot of subjective opinions of companies. This study used objective empirical data of a total of 83 outstanding companies that won the Korea Standards Association (KSA) National Quality Division over the past 7 years, increasing the reliability of their research results. A significant relationship between the main factors of divisional group activities (number of individual improvements, duration of activities and years of service) and the performance of TPM (time operation rate, performance operation rate and facility comprehensive efficiency) was analyzed. The number of individual improvements had a positive effect on the time operation rate and facility comprehensive efficiency. The activity period had a positive effect on the time operating rate, the performance operation rate and facility comprehensive efficiency. The number of years of service had a negative influence on the performance operation rate and facility comprehensive efficiency.
부패성 아스페르길루스증을 동반한 제 1형 선천성 폐기도 기형 1예
김정욱 ( Jung Wook Kim ),정호연 ( Ho Yeon Chung ),김은영 ( Eun Young Kim ),김현수 ( Hyun Soo Kim ),강경환 ( Kyung Hwan Kang ),박지영 ( Ji Young Park ),이은정 ( Eun Jung Lee ),위정국 ( Jung Kook Wi ),조경민 ( Kyoung Min Cho ),정회 전북대학교 의과학연구소 2011 全北醫大論文集 Vol.35 No.1
Congenital pulmonary airway malformation (CPAM) of the lung, also known as congenital cystic adenomatoid malformation, is an uncommon fetal developmental anomaly and presentation in adult is very rare. We experienced an unusual manifestation of CPAM with colonization of Aspergillus organisms in a 57-year-old male. Only one case of CPAM with aspergilloma has been reported to date.
Clear Cell Chondrosarcoma of the Tibia Diaphysis: A Case Report
강창민,한정수,정광영,정호연,김영준,Kang, Chang Min,Han, Chung Soo,Jung, Gwang Young,Jeong, Ho Yeon,Kim, Young Jun The Korean Musculoskeletal Tumor Society 2014 대한골관절종양학회지 Vol.20 No.2
투명세포연골육종은 매우 드문 골종양으로 장골의 골단이나 골간단에 발생한다. 많은 연구에서 대퇴골의 근위부를 가장 흔하게 발생하는 부위로 보고하였고, 상완골의 근위부가 그 다음으로많이 보고되었다. 조직학적으로 이 종류의 종양 세포들은 투명한 세포질과 뚜렷한 세포질막과 함께 중심성으로 위치하는 둥근 핵소체를 가지고 있다. 일반적으로 투명세포연골육종은 고식적인 연골육종과 혼동되지 않는다. 하지만, 방사선학적으로 장골의 간부에 발생한 경우 진단이 어려우며, 이전 문헌을 통하여 단 3례만이 보고된 바 있다. 저자들은 이전에 보고된 바 없는 42세 남자 환자의 경골 간부에서 발생된 투명세포연골육종을 보고하고자 한다. Clear cell chondrosarcoma is a very rare malignant bone tumor that shows a strong predilection for the epiphysis or metaphysis of long bones. Many studies have reported that the proximal end of the femur is the most commonly affected site, followed by the proximal end of the humerus. Histopathologically, tumor cells of this type have centrally located round nucleoli with clear cytoplasm and a distinct cytoplasmic membrane. Generally, clear cell chondrosarcomas is not confused with conventional chondrosarcomas. However, when it involves the diaphysis in long bones, diagnosis can be hindered, as only three reports of this exist in the literature. We report herein an unusual case of clear cell chondrosarcoma of the tibial diaphysis in a 42-year-old male.
강수흐(Enkhbat-Gansukh),김창현(Chang-Hyun Kim),정호연(Ho-Yeon Chung) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
본 논문에서 대상이 되는 가공공정의 제품은 자동차 Axle에 장착되는 Hub Assembly의 부품인 Non Driven이며, 생산성 향상 및 품질문제 해결을 목표로 Gantry Robot, Conveyor, Gripper Hand 등을 개선을 위한 변수로 설정하여 공정분석 및 개선을 수행하였다. 실행방안으로서 가공설비에 소재를 투입 및 배출하는 이송작업을 직선이송으로 동일화 하고, 소재의 투입과 배출을 동시에 수행함으로서 가공설비의 비가동 시간을 최소화 하여 공정시간을 기존 대비 12.5% 단축하였으며, 가공소재의 이송 과정에서 회전동작을 배제하여 중력낙하에 의한 제품의 손상을 원천적으로 제거하였다.