이상설 : 한국 근대수학교육의 아버지

설한국,이상구,Seol, Han-Guk,Lee, Sang-Gu 한국수학사학회 2009 Journal for history of mathematics Vol.22 No.3

Most who have heard of Sang-Seol Lee know him for his contribution to the Korean independence movement nearly a hundred years ago. This paper, however, will discuss Lee's other great contribution to his country; that of being "The father of modern mathematical education in Korea". Lee passed the rigorous government officer examination with the highest honor and became a teacher for the royal prince. Later he became the president of Sunkyunkwan, a national institute of higher learning since 1398, and eventually a well-known university bearing the same name. Lee was also a highly regarded Confucian scholar and well versed in foreign languages. He wanted Korea to become a modern country and felt that the areas of science and engineering were studies that needed improving in order to achieve modernization. While researching Western textbooks on the subjects he realized that Western mathematics would be especially important for Korea. With that, it became his mission to integrate Western mathematics into the Korean educational system. This paper will explain the importance of Sang-Seol Lee's contributions to mathematic education in Korea and how it helped Korea become the modern nation it is today.

초음파법을 이용한 Cr-Mo강 고온배관재료의 크리프손상 평가

이상국 한국비파괴검사학회 2000 한국비파괴검사학회지 Vol.20 No.1

화력발전소 보일러 고온배관인 주증기관, 헤드 및 증기드럼 등의 설비들은 장시간동안 고온고압의 가혹한 조건으로 운전됨에 따라 크리프손상에 의해 열화되고 있다. 이들 설비의 크리프손상측정에 적용되는 종래의 비파괴기법인 레프리카법, 전기저항법 및 경도법 등은 복잡한 측정절차 및 접근성, 검사결과의 신뢰도 및 측정정도 등 여러가지면에서 단점이 많다. 따라서 본 논문에서는 화력발전소 주요 고온배관에서 발생되는 경년열화인 크리프손상에 대한 초음파 측정연구를 수행한 결과로서, 고온배관재료인 Cr-Mo강의 프리프 인공열화재를 대상으로 이들에 대한 크리프손상 상태별 초음파 음속(sound velocity) 및 감쇠(attenuation)의 초음파 신호특성을 평가하였다. Boiler high-temperature pipelines such as main steam pipe, header and steam drum in fossil power plants are degraded by creep damage due to severe operating conditions such as high temperature and high pressure for an extended period time, Conventional measurement techniques(replica method, electric resistance method, and hardness test method) for measuring creep damage have such disadvantages as complex preparation and measurement procedures, too many control parameters, And also these techniques have low practicality and applied only to component surfaces with good accessibility. In this paper, artificial creep degradation test and ultrasonic measurement for their creep degraded specimens(Cr-Mo alloy steels) were carried out for the purpose of evaluation for creep damage. Absolute measuring method of quantitative ultrasonic measurement for material degradation was established, and long term creep degradation tests using life prediction formula were carried out. As a result of ultrasonic tests for crept specimens, we conformed that both the sound velocity decreased and attenuation coefficient linearly increased in proportion to the increase of creep life fraction(φc).

預金保險制度의 道德的 危險에 대한 硏究

梁聖國 韓日經商學會 1997 한일경상논집 Vol.13 No.-

Moral hazard is the possibility that insurance coverage leads insured parties deliberately to pursue risks that, in an uninsured state, they would not undertake. The purpose of this study is to consider the introduction of Deposit Insurance System as an institutional apparatus to ensure financial stability for Korean Commercial Banks which may face rising risks, following the nation's financial liberalization in effect since the early '80s. This study based on theoretical argument and practice in other countries, while seeking ways of solving the Moral Hazard problems in deposit insurance system currency(Korea Non-Bank Deposit Insurance Corporation(KNDIC) in partial operation by the nation's secondary financial institutions other than commercial bank. The analysis was conducted using data from Investment & Finance Companies during the 1977-1990, and to analyze the hypothesis regression analysis was adopted. The analysis result doesn't suggests that Korea Non-Bank Deposit Insurance Corporation has resulted in Investment & Finance Companies being more exposed to risks. That is, this result offers the Korea Non-Bank Deposit Insurance Corporation have no effect on the moral hazard of Investment & Finance Companies. More efforts will be conducted on the moral hazard of deposit insurance system, which maximization of depositors and minimization of moral hazard problems.

퇴원한 정신분열병 환자의 외래 통원 치료에 미치는 요인

박기국,원승희,김상헌,김휘동,강병조 대한생물치료정신의학회 1998 생물치료정신의학 Vol.4 No.2

목적 : 저자는 외래 통원 치료를 지속적으로 받는 환자들과 중단한 환자들의 현황을 조사 비교했다. 그리고 외래 통원 치료를 지속적으로 받는 환자들 중 투약 약물 종류에 따른 치료 순응도에 영향을 미칠 수 있는 변인들을 비교했다. 연구 대상과 방법 : 첫 번째 1997년 4월 1일부터 1998년 4월 30일 동안 퇴원한 정신분열병 환자 140명을 대상으로 자료를 조사한 후 분석했다. 두 번째 1998년 5월 18일부터 1998년 6월 17일까지 한달 동안 외래를 방문한 후 순응도 요인에 관한 설문지의 항목을 작성한 46명 환자의 자료를 분석했다. 결과 : 외래 통원 치료를 지속적으로 받는 환자군과 통원 치료를 중단한 환자군을 비교했을 때, 성별, 연령, 교육 수준, 결혼 여부, 직업, 종교, 정신분열병 아형, 발병 연령, 유병 기간, 입원 횟수, 복용 약물들의 하루 총복용 횟수에서 통계학적으로 의미 있는 차이는 없었다. 퇴원 당시 clozapine을 투약했던 환자들에서 외래 치료지속율이 가장 높게 나타났다. 외래 통원 치료를 받는 환자들의 투약 약물 종류군에 따라 경제적 곤란도, 교육 수준, 유병 기간, 입원 횟수에서 유의한 차이가 있었다. 약물 종류군(clozapine, risperidone, typical anti-psychotics)에 따라 경제 상태, 향후 기대 치료 기간, 약물에 대한 인식도, 약물 효과에 대한 기대, 현재 약의 부작용, 약물의 부작용 경험도, 성별, 연령, 결혼 여부, 직업, 종교, 정신분열병 아형, 발병 연령, 1일 약물 복용 총 횟수의 차이가 없었다. 결론 : 클로자핀 약물을 투약한 환자들이 다른 종류의 항정신병 약물 투약 환자들에 비해 외래 통원 치료를 지속적으로 받는 비율이 높았다. Objectives : The authors compared the status of discharged schizophrenics between who are continuously followed and who are not in the treatment. Also we compared compliance factors among administered drug groups of the follow-up schizophrenics. Methods : First, we surveyed and analysed one hundred-four schizophrenics after discharge. Second, we analysed the questionnaires which were written by the forty-six follow-up patients who were asked about compliance factors. Results : There were no significant differences between patients who are continuously follow-up and who are not in the treatment on sex, age, educational level, marriage, occupation, religion, subtypes of schizophrenia, age of onset, duration of illness, admission rate, and complexity of drug administration methods Clozapine administered group had higher follow-up rate than that of other antipsychotics(rispendone and typical antipsychotics) administered groups among the discharged schizophrenics. Among the follow-up patients, there were significant differences between atypical antipsychotics patients and typical antipsychotics patients on economic difficulty, educational level, duration of illness, admission rate. There were no significant differences on the other of demographic and psychiatric characteristics. Conclusion : Clozapine administered group had higher follow-up rate than that of ther antipsychotics administered groups among the discharged schizophrenics.

Streptozotocin-당뇨병 백서에서 당뇨병 이환기간에 따른 대동맥의 이완능 저하 및 Oxygen-Free Radical에 의한 이완능의 손상정도

김정국,김신우,김수동,서예경,하승우,김보완,백운이,권삼,강승완 경북대학교 병원 1997 경북대학교병원의학연구소논문집 Vol.1 No.1

목적: 당뇨병의 이환기간이 혈관의 내피세포 의존성 및 비의존성 이완능의 저하에 미치는 영향과 이환기간에 따라 oxygen-free radical(OFR)에 의한 동맥이완능의 손상정도에 차이가 있는지를 알아보고자 하였다. 방법: Streptozotocin(STZ)으로 당뇨병이 유도된 3 주 및 10주째의 백서군과 연령이 비슷한 정상 대조백서군의 적출 대동맥환을 norepinephrine으로 수축시킨 상태에서 내피세포 의존성 이완제인 acetylcholine(ACh) 및 비의존성 이완제인 nitroglycerine(NTG)에 대한 이완능을 즉정하여 비교 관찬하였다. 또한 xanthine과 xanthine oxidase의 혼합으로 생성된 H₂O₂에 대동맥환을 노출시킨뒤 역시 ACh과 NTG에 대한 이완능의 손상정도를 비교하였다. 결과: 3주및 10주째 당뇨병 백서의 대동맥환은 모두 대조군 백서의 대동맥환에 비해 ACh에 대한 이완능이 유의하게 감소하였으며 10주째 당뇨병 백서군에서의 ACh에대한 이완능의 저하는 3 주째 당뇨병 백서군에 비해 유의하게 심하였다.H₂O₂에 노출시킨 뒤 ACh에대한 이완능은 3주 및 10주 째 당뇨병 백서군에서 모두 대조군에 비해 유의하게 심한 손상을 보였으나 3주와 10주째 당뇨병 백서군 사이의 손상정도의 차이가 통계학적으로 유의하지는 않았다. 한편 3주 및 10주째 당뇨병 백서군 모두 NTH에 대한 대동맥환의 이완능은 대조 백서군과 별다른 차이가 없었으며 또 H₂O₂에 노출시킨 뒤에도 NTG에 대한 이완능의 손상은 관찰되지 않았다. 결론: STZ-당뇨병백서에서 대동맥의 이완능은 당뇨병에 이환된지 3 주째에 이미 ACh에 대한 내피세포 의존성 이완능이 선택적으로 저하되며 당뇨병의 이환기간이 길수록 이완능의 저하가 심하였고, OFR에 의한 동맥 이완능의 손상도 내피세포 의존성 이완능에만 선택적으로 나타나나 이환기간에 따라 OFR에 의한 이완능 손상정도에는 뚜렷한 차이가 없음을 시사하고 있다. Objectives: Diabetes mellitus produces histological evidence of endothelial as well as changes in vascular function in experimental animal. Oxygen free radicals interfere with of destroy endothelium-dependent relaxation in normal and diabetic blood vessels. The present study was investigated whether the duration of diabetic state can affect the severity of impairment in endothelium-dependent and/or independent relaxation and the sensitivity to oxygen free fadical (OFR)-induced damage in diabetic rat vasculature. Methods: The relaxative responses of aortic ring precontracted with norepinephrine in vitro to cumulative concentrations of acetylcholine (ACh) and nitroglycerine (NTG) were conducted in 3- and 10- week streptozotocin (STZ)-diabetic rats and agematched controls. After exposure to H₂O₂generated by mixing xanthine and xanthine oxidase, the degree of impairment in relaxative responses to ACh and NTG were also compared between 3- and 10-week diabetic rats. Results: The relaxative responses of aortic rings produced by cumulative concentrations of ACh were significantly lower in both 3- and 10-week diabetic rats than in the age-matched controls. The impairments of relaxative responses to ACh in 10-week diabetic rats were significantly greater than those in 3-week ones. After H₂O₂ exposure, the impairments of relaxative responses to ACh in 3- and 10-week diabetic aortas was also significantly greater than those in the control in the control ones. However, the severity of H₂O₂-induced damage in 10-week diabetic aortas was not significantly different than that in 3-week ones. In contrast, aortic rings of 3- and 10-week diabetic rats could still be fully relaxed by NTG, even after exposure to H₂O₂. Conclusion: These findings suggest that in SRZ-diabetic rat aortas selective impairment of endothelium-dependent relaxation to Ach can be found early even over a 3-week period after the induction of diabetes and the impairment may be greater in those with the longer duration of the diabetic state and that the impairment of the vascular relaxation by OFR is also selective to endothelium-dependent response but the sensitivity of OFR-induced damage may not be related to the duration of the diabetic state.

한국어판 DIS-IV의 개발과 표준화

서국희,손현균,최상섭,이미경,이중서,최인근,방현숙,연병길 大韓神經精神醫學會 2001 신경정신의학 Vol.40 No.5

연구목적 : DSM-Ⅲ-R의 개정판이라기 보다는 새로운 진단 기준으로 간주될 정도였던 DSM-Ⅳ의 출현은 정신장애의 진단분류체계에 매우 큰 영향을 미쳤다. DSM-Ⅳ의 변화를 반영하여 정신과적 진단을 내릴 수 있도록 DIS-Ⅲ를 개정하여 DIS-Ⅳ가 개발되었다. 본 연구는 국내에서의 정신의학적 연구를 더욱 활성화하고 활발하게 국제 공동연구가 이루어질 수 있도록 DIS-Ⅳ 한국어판을 개발하고 이를 표준화하는 데 그 목적이 있다. 방 법 : 번역 위원회에서 번역, 역번역, 어의적 정확성 확인, 한국어 용법에 맞도록 수정한 후 예비 연구를 거쳐 한국어판 DIS-Ⅳ가 완성되었다. 의과대학생 4명에게 Washington University DIS-Ⅳ training course와 동일한 내용과 방법으로 교육을 실시하였다. 두 명의 조사요원들이 한 환자를 DIS-Ⅳ를 사용하여 동시에 검사한 후의 진단을 비교하여 검사자간 신뢰도를 측정하고, 정신과 의사가 독립적으로 DIS-Ⅳ를 사용하여 검사한 후의 진단과 비교하여 절차 타당도를 평가하였다. 조사 대상은 2000년 1월부터 8월까지 2개 대학 병원 정신과 및 국립감호정신병원에서 치료중이던 환자 124명이었다. 결 과 : 평가자간 신뢰도의 kappa값 평균은 0.74였다. 양극성 Ⅰ장애, 범불안장애, 우울장애, 강박장애, 반항장애, 동통장애, 병적 도박, 외상후 스트레스 장애, 특정공포증 및 대부분의 물질 사용 혹은 관련 장애의 kappa값이 0.7 이상이었다. 정신과 의사의 진단과 조사요원의 진단의 일치도를 비교한 절차 타당도를 살펴보면 다음과 같다. 전체적인 sensitivity는 67.6%, specificity는 98.3%, kappa 값은 0.69이었다. 물질 사용 장애 및 물질 관련 장애의 SE는 79%, SP는 98.6%, kappa 값은 0.77이었다. 이를 제외한 나머지 정신 장애의 SE는 60.5%, SP는 98%, kappa 값은 0.64이었다. 본연구의 결과는 Robins 등에 의해 최초로 보고된 DIS의 신뢰도 및 타당도와 거의 비슷한 수준이었다. 결 론: 한국어판 DIS-Ⅳ가 높은 신뢰도와 타당도를 지닌 것으로 생각된다. 이 도구를 통해 물질 사용 및 관련 장애를 타당도와 신뢰도 높게 진단할 수 있다는 점이 매우 중요하다. 향후 정신장애의 진단 능력을 향상시키고 임상연구를 활성화하고 국제적인 학술적 교류를 늘리는데 일조할 수 있을 것이다. Objective : Appearance of DSM-Ⅳ has influenced greatly on the nosological classification of mental disorder, not considered as revised one of DSM-Ⅲ-R but a new criteria. DIS-Ⅳ has been developed after revision of DIS-Ⅲ in consideration of various changes in DSM-Ⅳ. This study is to develop and validate the DIS-Ⅳ, Korean version to activate Korean psychiatric research much more and to modivate more frequent international collaborative study. Method : Translation committee produced DIS-Ⅳ, Korean version through all the procedures of translation, back-translation, confirmation of retained original meaning of the English version, adaptation to Korean linguistic usage and preliminary study. Four medical students were trained during DIS-Ⅳ training course that retained the same contents and methods as of Washington University. Inter-rater reliability was measured by comparison between two diagnoses made from two interviewer who rated one patient at the same time. Procedural validity was measured by comparison between lay-interviewer's diagnosis and psychiatrist's diagnosis which were made after independent DIS-Ⅳ using interview. Subjects were 124 patients who were being treated at two University Hospital and National Forensic Psychiatric Hospital between January, 2000 and August, 2000. Results : Average kappa value of inter-rater reliability was 0.74. Diagnoses showing over 0.7 in kappa value were bipolar I disorder, generalized anxiety disorder, depressive disorder, obsessive-compulsive disorder, oppositional defiant disorder, pain disorder, pathological gambling, post-traumatic stress disorder, specific phobia and almost all substance use disorder or substance-related disorder. Procedural validity, that compared lay-interviewer's diagnosis and psychiatrist's diagnosis, were as follows: For all diagnoses, sensitivity, specificity and kappa were 67.6%, 98.3% and 0.69. For diagnoses of substance use disorder or substance- related disorder, sensitivity, specificity and kappa were 79%, 98% and 0.77. For other diagnoses except substance use disorder or substance- related disorder, sensitivity, specificity and kappa were 60.5%, 98% and 0.64. This results are almost at the same level as that of Robins and her colleagues who tirst reported reliability and validity of DIS. Conclusion : We think that DIS-Ⅳ, Korean version has higher reliability and validity. It is very important that diagnoses of substance use disorder and substance-related disorder can be made reliably and validly by this instrument. We expect that it can help to improve diagnosability of mental disorder, activate clinical research and increase international scientific communication.

고정층 액상흡착탑내의 합성흡착제/콜리딘계의 열역학적 흡착특성

이성식,김형준,이봉국,최정균 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2

Adsorption Equilibria and Kinetics of collidine in a aqueous solution onto the synthetic resin adsorbent were carried out in a fixed bed absorber at 278, 288, 298 anti 308K for various concentration ranges respectively. The effective intraparticle diffusivity, D_(e), based on the concentration difference in the liquid phase, was determined by comparing experimental and theoretical uptake curves. The ratio of the effective diffusivity to moleculer diffusivity, D_(e)´/DAB were independent of the amount adsorbed and temperature for synthetic resin/collidine system. The result supported the concept that migrated of inter-microparticle gaps predominates over effective intraparticle mass transfer within synthetic porous adsorbent. Amount adsorbed q_(e) was correlated Q_(st) = 15.35 + [(-4.14) - q_(e)] and E_(a) = 6.28 + [(-1.671 q_(e)] with heat of adsorption(Q_(st)) and activation energy(E_(a)).

직업교육 향상을 위한 애완동물 산업의 실태분석에 관한 연구

서국성,고기환,신정남 啓明專門大學 産業開發硏究所 2002 啓明硏究論叢 Vol.20 No.1

본 연구는 매년 크게 성장하고 있는 애견 산업의 분야별 특성과 자격증 제도에 대한 현황을 조사한 후 졸업생들의 취업지도를 활성화시키기 위하여 실시하였다. 취업에 필요한 기초자격증은 공인 트리머 자격증(1, 2, 3급. 교사, 사범)과 애견 구루머 자격증(1, 2, 3급, 교사, 사범)이 있으며. 그 밖에도 경비견 훈련사 자격증도 있다 보다 전문적인 자격증으로서는 Breeder자격증, Handler자격증 등이 있는데 학교에서 이론강의와 기초실습을 충실히 익힌 후 관련산업체에서 철저한 현장실습 수행과정을 이수하는 것이 필요한 것으로 조사되었다. This study was investigated the present condition on a certificates of qualification and characteristic of pet dog industry that it is greatly growing each year. in order to improve the employment of college graduates. The basic certificate of qualification for the employment are the official trimmer licensed(1, 2, 3 class, teacher and master) and pet groomer license (1, 2, 3 class teacher and master). There is also a certificate of the trainer of the guard dog. To obtain the these certificates of qualification, the study on the pet dog, that is lectures and basic practices at school and good teaching practice in grooming and trimming is necessary.

VaR를 이용한 환위험관리

양성국 제주대학교 관광산업연구소 2001 産經論集 Vol.15 No.1

전력용 변압기의 초음파 진단에 관한 연구(2)

이상국,길두송 한국비파괴검사학회 2003 학술대회 논문집 Vol.- No.1

The objectives of this study is to develope a device which could diagnose periodically the degradation of power transformer using ultrasonic signal through ultrasonic transducer attached surface of power transformer. And also it makes possible to reduce power failure time due to the power transformer fault and makes power system more reliable. Ultrasonic diagnostic device for power transformer was developed through this study. The developed device will contributed to early detection of fault and its location in the power transformer while it is operated, and also to extension of transformer life cycle, localization of this device will be reduced it's cost down compared with off shore. This device consisted of a new diagnostic algorithm is well suited for the power transformer which could found out some fault during the operation of on line monitoring system. This system could be extended to the general industrial plant utilizing the accumulated diagnostic technique.