지르코늄 합금 관의 임계좌굴 압력 산정을 위한 최소안전율

김형규(Hyung-Kyu Kim),김재용(Jae-Yong Kim),윤경호(Kyung-Ho Yoon),이영호(Young-Ho Lee),이강희(Kang-Hee Lee),강흥석(Heung-Seok Kang) 대한기계학회 2011 大韓機械學會論文集A Vol.35 No.3

얇은 관 탄성좌굴 공식의 불확실성을 고려하기 위해, 공식을 구성하는 파라미터인 튜브재료의 탄성계수, 푸아송 비, 튜브 두께 및 지름의 불확실성을 분석하였다. 본 연구는 원자로에서 연소되는 핵연료봉과 같이 사용 중 함몰을 엄격히 방지하고 있는 얇은 관의 설계신뢰도를 향상시키는 데에 중요하다. 분석 방법은 각각의 파라미터가 변화할 수 있는 범위를 충분히 포함할 수 있는 최소의 탄성좌굴 안전율을 구하고 이를 선형적으로 합하여 최종의 최소안전율을 구하였다. 최소 안전율에 가장 큰 영향을 미치는 파라미터는 관의 두께로 나타났다. 두께가 얇을수록 더 큰 최소안전율이 필요하며 예로 적용한 지르코늄 합금관의 경우, 두께가 0.254 와 0.87 ㎜ 일 때 최소안전율은 각각 1.547 과 3.487 로 나타났다. We consider the uncertainty in the elastic buckling formula for a thin tube. We take into account the measurement uncertainty of Young’s modulus and Poisson’s ratio and the tolerance of the tube thickness and diameter. Elastic buckling must be prohibited for a thin tube such as a nuclear fuel rod that must satisfy a self-stand criterion. Since the predicted critical buckling pressure overestimated that found in the experiment, the determination of the minimum safety factor is crucial. The uncertainty in each parameter (i.e., Young’s modulus, Poisson’s ratio, thickness, and diameter) is mutually independent, so the safety factor is evaluated as the sum of the inverse of each uncertainty. We found that the thickness variation greatly affects the uncertainty. The minimum safety factor of a thin tube of Zirconium alloy is evaluated as 1.547 for a thickness of 0.87 ㎜ and 3.487 for a thickness of 0.254 ㎜.

Zirconium 합금 관 임계좌굴 압력의 불확실성에 따른 최소안전율

김형규(Hyung-Kyu Kim),김재용(Jae-Yong Kim),윤경호(Kyung-Ho Yoon),이영호(Young-Ho Lee),이강희(Kang-Hee Lee),강흥석(Heung-Seok Kang) 대한기계학회 2010 대한기계학회 춘추학술대회 Vol.2010 No.11

Uncertainty of the elastic buckling formula of a thin tube is considered. The measuring uncertainty of Young’s modulus and Poisson’s ratio and the tolerance of the tube thickness and diameter are dealt with. The elastic buckling should be absolutely prohibited for a thin tube like a nuclear fuel rod that should satisfy a self-stand criterion. Since the predicted critical buckling pressure overestimated the actual one observed from an experiment, determination of the minimum safety factor is crucial. The uncertainty of each parameter (i.e., Young’s modulus, Poisson’s ratio, thickness and diameter) is mutually independent, so the safety factor is evaluated as the sum of the inverse of each uncertainty. It is found that the thickness variation strongly affects the uncertainty. The minimum safety factor of a thin tube of Zirconium alloy needs to be from 1.547 to 3.487 for the thickness of 0.87 and 0.254 ㎜, respectively.

전경대원에서 발생한 결핵의 임상 양상

문창기,박상준,조민구,김영중,김소연,김윤권,정준오,안석진,김은실,서승오,김지훈,최원제,이윤영,박형기,최규영,김현근 대한감염학회 2006 감염과 화학요법 Vol.38 No.6

Background: The purpose of this study was to document the incidence and clinical characteristics of patients with tuberculosis (TB) in combat and auxiliary police, living in a group, in Korea where the incidence rate of active TB in a general population is higher than in Western countries. Materials and Methods:We retrospectively reviewed the medical records of all tuberculosis patients diagnosed at National Police Hospital from January 2002 through December 2004. Results:In 2002-2004, a total of 156 cases of tuberculosis were identified with the mean (Standard deviation) age of 20.6 (±1.0) years. Of these, 134 (85.9%) patients were registered as new cases, 11 (7.1%) as relapse, 2 (1.3%) as failure, 5 (3.1%) as treatment-after-default cases whereas 4 (2.6 %) patients were not included in any categories. Average annual new TB rate and smear-positive TB rate were 86.5/10^(5) and 17.4/10^(5) person-years, respectively. In 12 of 31 smear-positive cases, time from onset of symptoms to diagnosis was more than 30 days. Two multidrug-resistance TB cases were identified and two suspected outbreak episodes of TB had occurred during 3 years. Conclusion:There was no statistically significant difference in the incidence rate of new cases of TB between the general population aged 20 to 29 years and combat and auxiliary police in Korea. 배경 : 국내 결핵의 발생은 감소 추세에 있으나 여전히 후진국형 발생양상을 보이고 있다. 특히 집단생활을 하는 젊은이들에서 발생하는 결핵의 유행이 간헐적으로 알려지고 있어 우려를 낳고 있다. 이에 저자들은 최근 전경대원의 결핵 발병 양상에 대해 알아보고자 본 연구를 시행하였다. 재료 및 방법 : 2002년 1월부터 2004년 12월까지 3년간 경찰병원에서 결핵 진료를 받은 전경대원의 의무기록을 후향적으로 분석하여 연도별 결핵 신환발생률, 도말양성결핵 신환율, 진단 지연, 집단발병, 다제내성결핵을 조사하였다. 결과 : 연도별 결핵 신환자 수(10만명당 발생추정치)는 2002년 50명(83.6명), 2003년 42명(83.7명), 2004년 42명(93.5명)이었고 도말양성 폐결핵 신환자 수는 2002년 10명(16.7명), 2003년 11명(21.9명), 2004년 6명(13.4명)이었다. 3년간 도말양성 폐결핵 환자는 31명이 있었고 그 중 12명은 호흡기 증상 발생 30일이 지나서 진단을 받았다. 다제내성 결핵은 2명이 있었으며 결핵의 집단발병이 의심되는 사례는 2차례 있었다. 결론 : 전경대원과 20-29세 연령군 일반인의 결핵 신환발생률, 도말양성 폐결핵 발생률의 통계적으로 유의한 차이는 없었다.

Zone refining에 의한 고순도 Cu 제조에 관한 연구

윤영옥,조형호,조훈,김세광,김영직 대한금속재료학회 2005 대한금속·재료학회지 Vol.43 No.3

The refining efficiency of high-purity Cu was investigated prepared by zone refining, with respect to travel rate, distribution coefficient, number of pass and zone length. Especially, to investigate refining efficiency with respect to zone length, experimental and computer simulation results were compared. The composition of the refined high-purity Cu was analyzed by GDOS (Glow Discharge Optical Spectroscopy) and GDMS (Glow Discharge Mass Spectrometer). The composition profiles of each segment at the given condition were compared with the results of micro hardness profiles. The results showed that the refining efficiency was inversely proportional to the travel rate, while it was proportional to the number of pass. The travel rate was more effective than the number of pass to enhance the refining efficiency in zone refining process. Impurities whose distribution coefficients are below 0.5 were removed efficiently. The effectively refined region increased with decreasing the zone length from 45 mm to 30 mm. Especially, the element S, which is known to be hardly removed by zone refining, could be removed to a level of under 0.1 ppm over the 60% region at 1 mm/min. (Received July 22, 2004)

컴퓨터 赤外線 全身體熱撮影과 FNT을 통해 살펴본 Bell's palsy에 대한 침치료의 臨床的 考察

尹敏永,趙恩嬉,許泰永,趙南根,文炯喆 한국전통의학연구소 2001 한국전통의학지 Vol.11 No.1

Object : This study is designed to evaluate the clinical therapy of acupuncture by the data of DITI(Digital Infrared Thermographic Imaging) and FNT(Facial Nerve stimulation Test) examination and the changes of clinical symptoms after the therapy of acupuncture in the patients with Bell's palsy. Contents : The conservative therapy with acupuncture was performed during 1-8weeks. The acupuncture points of S4, S6, G14, S2, BL2, SI18, TE23, LI4 and S36 were used. In the pre- and post therapy, DITI examinations was performed in patients who had Bell's palsy and were treated by acupuncture, and then tried to correlate the results of clinical symptoms with the difference of thermographic findings. And FNT examinations were performed in the same patients above, and then tried to correlate the results of clinical symptoms with the difference of nerve response findings. Setting : The standard routine thermographic examination with thermography (DITI) and nerve response with FNT(Facial Nerve Stimulation Test) were performed in the 16 patients with Bell's palsy at pre- and post acupuncture. Patients : Thermographic imaging of 16cases was analyzed. They had diagnosed Bell's palsy. They were treated by acupuncture and moxibustion therapy in Wonkwang Oriental Hospital from Jauary, 1999 to February, 2000. Results : 1) The results of treatment showes that 56.25% of patients achieved clinical excellent recovery and 31.25% achieved good recovery. After compairing the DITI results before and after treatment, we found 43.75% of patients achieved excellent recovery and 43.75% achieved good recovery. 2) After compairing the FNT results before and after treatment, we found 25% of patients achieved excellent recovery and 56.25% achieved good recovery. Conclusion : 1) Acupuncture showed good results over 87.5% in clinical evaluation and 87.5% in DITI. Thermographic examination showes terapeutic effect of acupuncture treatment. 2) Acupuncture showed good results over 87.5% in clinical evaluation and 81.25% in FNT. FNT showes nerve response recovery effect of acupuncture treatment.

재래종 콩 유전자원의 주요 형태적 특성과 변이

윤문섭,백형진,이정란,김행훈,조양희,안종웅,김창영 한국국제농업개발학회 2003 韓國國際農業開發學會誌 Vol.15 No.4

본 실험은 한국, 중국 및 일본 재래종 콩 유전자 자원의 주요형질 변이를 조사하고 이들 자원간의 지리적 유연관계를 비교하고자 수행하였으며, 그 결과를 요약하면 다음과 같다. 1. 경장은 한국(66㎝)이나 일본자원(54.9㎝)보다 중국자원(71㎝)에서 더 컸으며, 또한 변이도 중국자원에서 가장 큰 것으로 나타났다. 2. 개화일수 및 생육일수는 한국자원(65.5일, 151.4일)이 가장 길었으며 중국(57일, 120일)과 일본자원(59.9일, 122.4일)은 같은 경향을 나타냈다. 또한 한국과 중국자원은 지역에 따른 차이를 나타냈으나 일본자원에서는 확인할 수 없었다. 3. 백립중은 한국(18.8g), 일본(17.2g) 및 중국(14.7g) 순으로 무거웠다. 특히 한국자원은 9~11g과 23~25g에서 정점을 나타냈고, 변이폭도 가장 컸다. 반면 일본과 중국자원은 13~17g사이에서 정점을 나타냈다. 4. 협수는 중국(46.9개)이나 일본자원(36.5개)보다 한국자원(75.5개)에서 가장 많았으며, 변이폭도 한국자원에서 가장 컸다. 내도복성은 일본자원에서 가장 강하였다. 5. 정준판별분석결과 can 1을 경계로 하여 오른쪽 상하에 한국재래종이 주로 분포하였고 왼쪽에는 중국과 일본 재래종이 주로 분포하여 각 나라별로 고유한 영역을 가지고 분리되었다. 전체적 경향이 중국과 일본자원이 한국자원보다 가까운 경향을 나타냈다. This experiment was carried out to compare the characters of 944 Korean soybean landraces, 716 Chinese, and 170 Japanese soybean landraces introduced from USDA soybean germplasm collection. Cannonical discriminant and cluster analyses were conducted by their origins. The population from China was taller in plant height than those from Korea and Japan, also its variation was largest in Chinese population. The population from Korea was langer than those from China and Japan in terms of days to flowering and maturity. Also, Korean and Chinese accessions appeared the difference of those traits according to latitude. One hundred seeds weight was in the order of Korean(18.8g), Japanese(17.2g) and Chinese populations(14.7g), especially Korean population was distinguished into two groups; the group including accessions between 10 and 15g, and the other group including accessions between 20 and 25g. However, others showed the peak in range of 13~17g. The number of pod per plant was more in Korean accession(75.5) with the largest variation than Chinese(46.9) and Japanese accession(36.5). The distribution of Korean, Chinese and Japanese accessions reflected the origin of accessions analyzed by cannonical discriminant analysis. The relationship between their geographical origins showed the population of China and Japan are losely related.

항정신병 약물치료하에서 주관적 안녕감을 평가하는 한국형 척도의 개발

윤진상,국승희,이형영,이철,백인호 대한신경정신의학회 2000 신경정신의학 Vol.39 No.6

연구목적 : 본 연구의 목적은 1994년 Naber 등이 개발한 38문항의 '항정신병 약물치료하에서 주관적 안녕감을 평가하는 자가평정척도(a self-rating scale to measure subjective well-being under neuroleptic tre-atment : SWN)'를 문항수를 줄이고 문항내용을 수정하여 한국형으로 개발하고자 하였다 방 법 : 204명의 정신분열병 환자들에게 22문항의 KmSWN과 General Health Questionnaire/Quality of Life-12(GHQ/QL-12)를 실시하였고, 사회인구학적 및 임상적 특징을 조사하였다. 자료분석에는 척도에 대한 반응과 정보가 신뢰로운 176명의 자료를 포함시켰다. 첫째, KmSWN의 신뢰도와 타당도를 평가하였다. 둘째, KmSWN총점과 사회인구학적 및 임상적 특징의 관계를 조사하였다. 끝으로 KmSWN의 총점을 예측하는 변인들을 알아보기 위해 KmSWN총점과 유의한 상관이 있는 변인들을 독립변인으로 하고 KmSWN총점을 종속변인으로 하여 단계적 중다회귀분석을 실시하였다. 결 과 : 22문항의 KmSWN중 세문항은 내적 일치도가 낮아서 추후분석에서 제외되었다. 19문항의 KmSWN(KmSWN-19)은 반분신뢰도(.91), 문항간 상관의 평균(.38), 내적 일치도(Cronbach alpha .92)가 높았다. 요인분석에서는 '불만족', '신체 및 정신기능', '정서조절 및 자기통제'의 3개요인이 추출되었다. KsSWN-19총점과 GHQ/QL-12총점간의 상관은 -.83으로 공존타당도가 높았다. 사회인구학적 및 임상적 특징중 연령, 용돈, 사회경제적 수준, 과거 입원횟수, 투약에 대한 순응 투약에 대한 만족도는 KmSWN-19 총점과 정적 상관이 있었던 반면, 질병의 심도, 파킨슨 증상의 심도, 지연성 운동장애의 심도, 투약횟수 및 투약을 빠뜨린 횟수는 KmSWN-19 총점과 부적 상관이 있었다, 단계적 중다회귀분석결과, KmSWN-19총점을 유의하게 예측하는 변인은 투약의 만족도, 투약을 빠뜨린 횟수 및 용돈이었으며, 변량의 24%를 설명하였다. 결 론 : KmSWN-19는 정신분열병 외래환자의 주관적 안녕감을 측정하는 자기평정척도로서 신뢰롭고, 타당하며 실용적임이 확인되었다. 아울러 KmSWN-19는 항정신병 약물과 관련한 주관적 안녕감에만 특이한 척도가 아니라, 척도에 응답할 수 있는 모든 정신분열병 환자나 기타 정신증 환자들에게 적용할수 있는 일반적 척도임이 시사되었다. 한편, KmSWN-19총점에 대해 독립변인들의 설명변량이 크지 않는 점을 주관적 안녕감 혹은 삶의 질의 평가에서 개인의 가치나 신념, 성격특성 같은 개인내적 특성을 고려해야 할 필요성이 있음을 시사한다. Objective : The purpose of this study was to develop the Korean modification of SWN(KmSWN), based on the original 38-item SWN(a self-rating scale to measure subjective well-being under neuroleptic treatment)by Naber et. al. In 1994, but containing the reduced number of items and the modified content. Methods: The KmSWN with 22 items and General Health Questionnaire/Quality of Life-12(GHQ/QL-12) were administered to 204 out-patients with schizophrenia. Also, their socio-demographic and clinical characteristics were investigated. Data analyses were conducted based on 176 patients whose responses to the scale, as well as whose related informations, were reliable. First, the reliability and validity of KmSWN were assessed comprehensively. Second, the relationships between the total score of KmSWN and the sociodemographic and clinical characteristics were examined. Finally, in order to identify the predictable variables on the total score of KmSWN, the stepwise multiple regression analysis was conducted, where the inde-pendent variables were already shown significant correlations with the total score of KmSWN. Results : Three of 22 items of KmSWN were excluded from the following analysis due to their poor internal consistency. KmSWN comprised with 19 items(KmSWN-19) showed high levels of spilt-half reliability(.91), mean of inter-item correlations(.38) and internal consistency (Cronbach alpha .92). Factor analysis of the KmSWN-19 revealed that a three-factor solution accounted for 100% of total explained variance. The three factors were interpreted as 'diss-atisfaction','physical and mental functioning', 'emotional regulation and self-control', The concurrent validity of KmSWN-19 with GHQ/QL-12 was very high(-.83). Of the socio-demographic and clinical characteristics, age, disposable money, socioeconomic level, number of previous hospitalizations, compliance with medication and satisfaction with medication were positively correlated with the total score of KmSWN-19, while severity of illness, severity of parkinsonism, severity of dyskinesia, administration frequency of medication and omission number of medication were negatively correlated. However, the total score of KmSWN-19 was not correlated with medication, the omission number of medication and the disposable money were significantly contributed to the total score of KmSWN-19, and they explained 24% of the variance. Conclusions : The above findings indicated that KmSWN-19 was a reliable, valid and pra-ctical self-rating scale to measure subjective well-being in out-patients with schizophrenia. Moreover, KmSWN-19 seemed to be a general scale applicable to all the schizophrenic or other psychotic patients if they were able to complete it, rather a specific scale only for the patients undergoing the neuroleptic treatment. Based on the results of the predictable variables on the total score of KmSWN-19, one may argue that intra-individual characteristics such as value, belief and personality traits, although they were not evaluated in this study, should be considered in assessing subjective well-being or the quality of life.

Dynamic Plasma Screening Effects on Electron-ion Collisions in Dense Plasmas

윤정식,김형관,정영대 한양대학교 이학기술연구소 1999 이학기술연구지 Vol.1 No.-

고밀도 플라즈마 내에서의 전자-이온 충돌여기 그리고 제동복사 현상이 미치는 동적 플라즈마 가림효과를 연구하였다. 전자-이온 상호작용 포텐셜은 플라즈마 유전함수를 도입하여 사용하였다. 직선궤도 방법을 사출입자의 궤도에 적용하였다. 동적 플라즈마 가림효과를 포함한 전이확률이 정적 플라즈마 가림효과를 포함한 전이확률보다 항상 큰 값을 갖는 것을 알 수 있었다. 또한 동적 플라즈마 가림효과를 포함한 제동복사 미분 산란단면적이 정적 플라즈마 가림효과를 포함하고 있는 제동복사 미분 산란단면적보다 항상 크다는 것을 알 수 있었다. 사출입자의 속도는 전자의 열적속도보다 작을 경우, 동적 분극 가림효과가 정적 플라즈마 가림효과로 되었다. 그러나, 사출입자의 속도가 전자의 열적 속도보다 클 경우, 상호작용 포텐셜은 거의 가려지지 않는 것을 알 수 있었다. Dynamic plasma screening effects are investigated on electron-ion collesional excitation and Coulomb bremsstrahlung processes in dense plasmas. The electron-ion interaction potential is considered by introduction of the plasma dielectric function. The straight-line trajectory method is applied to the path of the projectile electron. The transition probability including the dynamic plasma screening effect is found to be always greater than that including the static plasma screening effects. It is found that the differential bremsstrahlung radiation cross section including the dynamic plasma screening effect is also greater than that including the static plasma screening effect. When the projectile velocity is smaller than the electron thermal velocity, the dynamic polarization screening effect becomes the static plasma screening effect. However, when the projectile velocity is greater than the electron thermal velocity, the interaction potential is almost unshielded.

동시에 진단된 대장암·위암 중복암 2예

신영도,이상목,이기형,윤충 대한대장항문학회 1996 Annals of Coloproctolgy Vol.12 No.3

문자 단위 매칭과 유닛 단위 매칭을 이용한 온라인 필기 한자 인식

윤병훈,김형태,박미나,하진영 강원대학교 정보통신연구소 2006 정보통신논문지 Vol.10 No.-

This paper presents on-line Chinese character recognition methods based on DP-Matching. The recognition system consists of character matching and unit matching methods. The character matching method adopts DP-matching between the input data and models as a major matching method, while unit matching method uses relation matching between consecutive units (part of character) in addition to DP-matching between units. A couple of methods combining character matching and unit matching methods were examined also. We found that we got best recognition result applying unit matching methods to the recognition candidates from character matching method.