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박용한,송병흠 한국항공운항학회 1993 한국항공운항학회지 Vol.1 No.-
본 연구에서는 ICAO, 미국, 영국, 프랑스, 일본 등 세계 각 국의 항공기소음 평가방법을 이론적으로 비교분석하여 우리나라에 가장 적합한 항공기 소음영향도의 평가방법을 도출, 우리나라 항공기소음에 대한 환경기준의 설정 및 공항주변의 항공기 소음대책에 관한 기초자료를 제공하고자 한다.
송병흠,박용한 한국 항공대학교 항공산업기술연구소 1994 航空宇宙産業技術硏究所 硏究誌 Vol.4 No.-
우리나라 항공기 소음영향도의 산정방법에 대한 평가를 위하여 본 연구에서는 ICAO, 미국, 영국, 프랑스, 일본 등 세계 각국의 항공기소음 평가방법을 이론적으로 비교분석하고, 특히 WECPNL이 갖는 여러가지 특성을 평가하여 우리나라에 가장 적합한 항공기 소음영향도의 평가방법을 도출, 우리나라 항공기소읍에 대한 환경기준의 설정 및 공항주변의 항공기 소음대책에 이론적 근거자료를 제공하고자 한다. In this study, the methods for measuring the influence of aircraft noise being used in ICAO, U.S.A., U.K, France, Japan and so forth were compared mutually and analyzed theoretically and we intended to find out the methods that appropriate to our situations. Therefore, this study is to provide the basic research materials for the establishment of our environmental standards and countermeasures for airsraft noise pollution.
요추 Y-각 협착증 : 요추간 협착증의 새로운 개념 New Concept of Lumbar Stenosis
김영수,조용은,박형천,윤도흠,노성우 대한신경외과학회 1993 Journal of Korean neurosurgical society Vol.22 No.1
Authors measured the Y-shaped angle made by both yellow ligaments and both laminae named Y-angle at the spinal CT scan in normal and lumbar stenosis group. The normal range of Y-angle is between 60˚and 95˚. Lumbar stenosis is classified into narrow Y-angle stenosis(<60°) and wide Y-angle stenosis(>95°) by Y-angle. Narrow Y-angle stenosis is most common in degenerative spondylotic stenosis. Wide Y-angle is most common in congenital stenosis. The Y-angle is a simple and useful diagnostic indicator in the diagnosis of lumbar spinal stenosis on CT scan and MEU scan.
고윤화,손용훈,윤정흠,오상우,이귀행,박민철 圓光大學校 醫科學硏究所 2008 圓光醫科學 Vol.23 No.2
Background: Minnesota multiphasic personality inventory-2(MMPI-2) is superior to its predecessor in differential diagnosis. this study was to investigate MMPI-2 profiles of the patients with schizophrenia and depression and to discriminate among two groups. Methods: The sample consisted of 35 patients with schizophrenia(male 24, female 11), 35 patients with depression(male 18, female 17) diagnosed by the diagnostic and statistical manual of mental disorders(DSM-IV) for schizophrenia & depression at department of neuropsychiatry in WonKwang University from January 2005 to December 2007. The data from the results were analyzed statistically by t-test and discriminant analysis. Results: The results were as follows. First, according to t-test results the comparison of schizophrenia patients and depression patients in MMPI-2 among two groups showed significant differences; the validity scales: F, F(P); The clinical scales: D, Pa; The restructured clinical scales: Rcd(dem), RC4, RC6, RC8; The content scales: ANX, DEP, BIZ; The supplementary scales: AGGR, PSYC, Mt, GF, O-H. Second, as a results discriminant analysis, BIZ, D were significant predictors in distinguishing patients with schizophrenia from patients with depression. Third, probability to be discriminated schizophrenia in schizophrenia was 91.4%, probability to be discriminated depression in depression was 85.7%. Conclusion: Finally, we remind readers that although the MMPI-2 may prove to be useful in the task of differential diagnosis, it should be used only in combination with other patient information. 배경: MMPI-2는 감별진단에서 기존의 MMPI 보다 더 우수하다. 본 연구는 정신분열증 환자와 우울증 환자의 MMPI-2 프로파일과 두 집단을 판별하는 연구를 하였다. 방법: 2005년 1월부터 2007년 12월까지 원광대학교 병원 신경정신과에서 정신분열증과 우울증으로 진단된 정신분열증 환자 35명(남성 24명, 여성 11명), 우울증 환자 35명(남성 18명, 여성 17명)이 본 연구에 참여하였다. 자료는 t-검증과 판별분석으로 분석하였다. 결과: 결과는 다음과 같다. 1. t-검증 결과, 두 집단간 유의미한 차이를 보인 척도들로는 타당도 척도에서 F, F(P) 척도, 임상척도에서 D, Pa, 척도, 재구성 임상척도에서 Rcd(dem), RC4, RC6, RC8척도 였다. 내용척도에서는 ANX, DEP, BIZ척도 였으며 보충척도에서는 AGGR, PSYC, MT, GF O-H척도 였다. 2. 판별 분석 결과로서, 정신분열증과 우울증을 구별하는데 가장 유의한 예언요소는 BIZ, D척도로 나타났다. 3. 판별함수를 통한 진단율은 정신분열증을 정신분열증으로 판별해주는 정확도는 91.4%였고, 우울증을 우울증으로 판별해주는 정확도는 85.7%였다. 결론: 본 연구 결과를 통해서 MMPI-2가 두 집단을 감별하는데 유용하다고 증명되었을지 모르지만 더욱 정확하게 감별하기 위해서 환자의 기타 정보를 사용해야 할 것이다.
The Ultimate Bound of a Sampled-Data Sliding Mode Control System with Short Sampling Period
Heum-Yong Park,Young-Hun Jo,Kang-Bak Park 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
Almost all of control methods proposed so far have been designed in the continuous-time domain. Actual systems, however, have been implemented in the discrete-time domain since MCU and/or microprocessors have been used for the control system, that is, the overall system turned to be a sampled-data system. In this case, the ultimate error cannot converge to zero in the actual system even though the proposed control algorithm showed the asymptotic stability in the continuous-time domain. In this paper, therefore, the ultimate error bound of a sampled data system has been investigated. The ultimate error is shown to be related in the sampling period.
( Sang Heum Park ),( Do Hyun Park ),( Tae Hoon Lee ),( Ho Sung Lee ),( Yong Sub Lee ),( Sae Hwan Lee ),( Chang Kyun Lee ),( Suck Ho Lee ),( Il Kwun Chung ),( Hong Soo Kim ),( Hyo Jin Lee ),( Sun Joo K 대한소화기기능성질환·운동학회 2010 Gut and Liver Vol.4 No.1
Background/Aims: The aim of this study was to evaluate whether the mucosa-tracking technique is effective for improving precutting-related pancreatitis and the sustained failure of bile duct cannulation in precut papillotomy (PP) with the Iso-Tome (MTW Endoskopie). Methods: From September 2004 to June 2006, PP was performed with the Iso-Tome if biliary cannulation failed by conventional methods for approximately 5 minutes. The pink intrapapillary mucosa (PIPM) exposed by PP was tracked and classified into four groups: fully exposed and oriented to the direction of the bile duct (group A) or the pancreatic duct (group B), partially exposed (group C), or unexposed (group D). The success rate of bile duct cannulation (SRBC), the procedure time required for successful bile duct cannulation (PTBC), and the complications in the first session were compared between the mucosa-exposed groups (MEGs; group A, B, and C) and the mucosa-unexposed group (MUEG; group D). Results: A total of 59 patients (25 females, 34 males) with a mean age of 65.2 years were enrolled. The MEGs and MUEG comprised 52 (88.1%) and 7 (11.9%) patients, respectively. SRBC in the first session was 86.4% (51/59) in total and 92.3% (48/52) in the MEGs, compared to only 42.9% (3/7) in the MUEG (p=0.005). The mean PTBC in the MEGs and MUEG was 8.7 minutes and 16.3 minutes, respectively (p=0.23). Complications occurred in 6.8% of the patients (4/59; all pancreatitis); there were no differences between the MEGs (5.8%, 3/52) and MUEG (14.3%, 1/7; p=0.41). All four patients with pancreatitis were managed medically. Conclusions: The mucosa-tracking technique in PP with the Iso-Tome is a feasible and useful method of enhancing SRBC. PIPM is an important endoscopic landmark for successful PP. (Gut Liver 2010;4:76-83)
박흠례(Heum Rea Park),최덕주(Duck Joo Choi),박현철(Hyun Chul Park),박종재(Jong Jae Park),이성광(Sung Kwang Lee),강동훈(Dong Hoon Kang),김주현(Ju Hyun Kim),김득조(Duk Jo Kim),오수용(Soo Yong Oh),강영숙(Young Sook Kang),이정남(Jong Nam 대한소화기학회 1997 대한소화기학회지 Vol.30 No.1
Hepatocellular carcinoma in pregnancy is very rare. Because it is associated with high maternal and fetal rnortality, the risk group of developing hepatocellular carcinoma in pregnant women must be closely monitored. The risk group includes pregnant women who are HBsAg carriers with cirrhosis, long term users of oral contraceptives, and who have a history of multiparity. An elevated a fetoprotein(AFP) level is useful for the diagnosis. The risk group should be closely monitered with a careful physical examination and AFP measurement. Then hepatocellular carcinoma can be detected at an early stage. We have experienced a case of hepatocellular carcinoma in a pregnant woman with an elevated AFP level who was an user of oral contraceptives and had a history of multiparity. It was confirmed by operation and histologic examination. (Korean J Gastroenterol 1997;30:126-130)
슬라이딩 모드 제어기가 적용된 샘플치 시스템에 대한 안정도 판별 조건
박흠용(Heum-Yong Park),조영훈(Young-Hun Jo),박강박(Kang-Bak Park) 제어로봇시스템학회 2011 제어·로봇·시스템학회 논문지 Vol.17 No.2
Although most of control methods have been studied in the continuous-time domain, the actual control systems have been implemented using MCU (Micro Control Unit) and/or microprocessors so that the overall systems turn to be sampled-data systems. In this case, the stability criterion of the closed-loop system is not easy to derive. In this paper, a simple stability criterion for the sampled-data system with sliding mode controller is derived.