On eigenvalues of the Laplacian for a Riemannian submersion

채한강,박정형 호남대학교 산업기술연구소 1998 산업기술연구논문집 Vol.6 No.-

일반적으로 리이만 서브머젼에서 기저 공간의 고유 형식을 전공간으로 풀백 시켰을 때, 그것은 전공간의 고유 형식이 되지 않는다. 본 논문에서는 경계를 가진 다양체 상에서 리이만 서브머젼의 스펙트럴 기하에 관해서 토의하고, 고유치의 강성에 관해서 연구(예제 3.3, 정리 3.5, 정리 3.6) 하였다. Let π : Z→Y be a Riemannian submersion. We assume that the fibers of πare closed and that manifolds are compact with smooth boundary. We impose suitable boundary conditions. In this paper, we discuss some results concerning the spectral geometry of Riemannian submersion on the manifold with smooth boundart. We study rigidity of eigenvalues in a Fiemannian submersion.

정보통신기술의 발달이 무역과 산업에 미치는 영향

김헌구,오정훈 한국정보사회진흥원 2003 정보화정책 Vol.10 No.3

본 논문은 MRVIO(Multi-Regional Variable Input Ouiput) 모형을 사용하여 우리나라의 정보통신서비스산업의 기술발전이 우리나라를 포함한 아시아·태평양지역 10개국의 산업구조에 미치는 영향을 분석하였다. 나아가 이러한 상호 교역국가간의 생산분업 가능성을 파악하고 이와 같은 생산활동 변화의 원이이 IT자본재에 대한 투자인지 혹은 생산에 필요한 중간재의 국제적 교역인지 등에 대하여 살펴보았다. Using the MRVIO model, this paper discusses the relations of industrial linkage among 30 industries in 10 ciuntries of the Asia-pacific region. This paper studies changes in the output(production activily) of each contryresulting from the technological improvements in the Korean telecmmunications service industry. This analysis we draw fron the structural change in the region suggests that the change of teleco,,unications service industry may affect international division of production. In addition, we find the change in output in the region is more closely realted to input trade between the ciuntries the region than to telecommunications service(IT) use.

IT상업이 한국경제에 미치는 영향분석 : 95 & '98년도 비교

김헌구,오정훈 한국정보사회진흥원 2004 정보화정책 Vol.11 No.3

본 논문은 VIO모형과 1995년 및 1998년 데이터를 이용하여 그 결과를 비교함으로써, 1995년과 1998년 사이에 IT산업이 우리나라 산업전반에 걸쳐 미친 파급효과의 정도를 파악하고 그 변화추이를 분석하는 것에 그 목적이 있다. 특히 1997년 우리나라에 불어 닥친 IMF 관리체제라는 특수한 상황을 극복하기 위하여 IT산업이 담당하는 역할을 살펴보고자 한다. IMF 관리체제 이전인 1995년과 그 이후인 1998년 사이에 있어, IT산업에서의 기술발달의 대체효과를 분석한 결과, IT기술 발달이 우리나라 산업 전반에 생산기술의 향상을 증진시켜 생산성을 높일 것이라는 예측은 빗나갔다. 이 기간동안에 가정용 전기기기산업과 정밀기기산업에서 생산 활동의 증가가 두드러질 뿐 그 외의 대부분의 산업에서는 오히려 생산 활동이 줄어드는 현상이 나타났다. 총 효과를 분석한 결과, 1995년에는 과반수이상의 조사대상 산업에서 생산의 증가가 나타나는 반면 1998년에는 10개 이상정도의 산업이 생산의 증가를 보인다. 이는 규모의 경제를 가져오는 IT친화적인 생산구조 보다는 가격이 낮아진 IT제품의 보급 확대로 인한 부가가치의 증가에 기인하는 것으로 판단된다.

運動時間에 따른 超過酸素消費量(EPOC)과 持續時間에 關한 硏究

孔暢斌,文正玉 仁荷大學校 스포츠科學硏究所 1993 論文集 Vol.5 No.-

This research is to examine excess oxygen consuption(EPOC) quantity and EPOC duration following to exercise time (the intensity of 80% Vo₂max with exercise time 5 minutes and 50% Vo₂max with exercise time 10 minutes, 20 minutes, 30 minutes), so abstract the students who are in I university, physical education department at random (age 19-23) Four of them have above six years athlete career and four of them are not athletes. This experiment consists of 6 ways and divided the intensity of 80% Vo₂max with exercise time 5 minutes, 10 minutes, 15minutes, and 50% Vo₂max with exercise time 10 minutes, 20 minutes and 30 minutes. EPOC duration and quantity measurement are divided by heart rate, and analysis the reliance degree and propriety degree with statistical identification method. Between athletes' and non-athletes' difference is verified by test (group), so conclusions are as follows: 1. Each experiment in recover duration time, the interrelation shows a significant meaningful relation at a significant level 99.5%. Thant is to say, during 5 minutes, 10 minutes to this intensity of 80% Vo₂max, each three exercise duration time and the atlitude of subjects for experiment and 10 minutes, 20 minutes, 30 minutes to the intensity of 50% Vo₂max, and the atlitude of subjects for the three exercise duration time is thought to be reliable. 2. In every six experiment, athlete's group is lower than non athlete's group in significant level EPOC duration time, at significant level 95%. That is to says athlete's group is lower than non-athlete's at the intensity of 80% Vo₂max with exercise time 5 minutes 10 minutes, 15 minutes, and 50% Vo₂max with 10 minutes, 20 minutes and 30 minutes. 3. In 6 experiments treatments, athlete's group showed that in significantly lower than non-athlete's group in exercise intensity of 80% Vo₂max with exercise time 5 minutes and of 50% Vo₂max with exercise time 10 minutes, 20 minutes, in experiment. Namely, we can see that in 3 experiment treatments athlete's group has a EPOC quantity lower than non-athlete's group in significant meaningful level with the exercise intensity of 80% Vo₂max in the 5 minutes exercise time and of 50% Vo₂max in the 10 minutes and 20 minutes exercise time. 4. Between athlete's and non-athlete's group of 95% significant level, no meaningful difference exists in 6 experiment treatments. That is to say, between athlete's and non-athlete's group EPOC quantity of 3 minutes break time makes no difference with the exercise intensity of 80% Vo₂max of 5 minutes, 20 minutes and 30 minutes exercise tim e experiment treatments.

복싱에어로빅 참여자의 건강증진생활양식에 따른 생활만족도에 관한 연구

최윤동,김정주,김형돈 경희대학교 체육대학 한국체육과학연구소 2003 體育學論文集 Vol.31 No.-

Among various life-time sports, the boxing-aerobic as aerobic exercise which unites the boxing with the aerobic has been recently attracted public attention due to usefulness and effectiveness. Naturally, the boxing-aerobic enables all over the body to equally train and each body part light and flexible as well as participants to be on a effective diet. The purpose of this study is to look into minutely life satisfaction according to health promoting life styles of participants in boxing-aerobic among life-time sports as well as offers fundamental information for self-control and life quality improvement of boxing-aerobic participants. Specially, it aims to identify (1) differences in health promoting life styles in accordance with demographic characteristics of participants in boxing-aerobic (2) differences in life satisfaction in accordance with demographic characteristics of participants in boxing-aerobic (3) inter-relation between health promoting life styles and life satisfaction of participants in boxing-aerobic. In order to accomplish the purpose, a convenient sample of 130 boxing-aerobic participants was selected, and the questionnaire for life styles test used for this study was made out by Seo, Yeon-Ok(1994) and for life satisfaction test used was made out by Park Hong-Seok(2001). The background variables of the study were demographic characteristics such as age, education, average income, marriage, career to participate, blood type and religion. Through the analysis of established hypothesis and collected data, it is concluded that the higher monthly average income, the higher health promoting life styles and the higher life satisfaction.

실험실적 당뇨성 흰쥐에서 acetaminophen의 대사에 관한 연구

임은주,윤병재,윤병재,조희숙,김대재,최종원 경성대학교 환경문제연구소 2000 環境硏報 Vol.10 No.1

Acetaminophen is one of the most important drugs used for the treatment of mild to moderate pain when an anti-inflammatory effect is not necessary. Phenacetin, a prodrug that is metabolized to acetaminophen, is more toxic than its active metabolite and has no rational indications. In this study, we were observed activities of free radical generating enzymes, free radical scavenging enzymes and glutathione-related enzymes as well as detoxification mechanism of against acetaminophen-induced hepatotoxicity in STZ-induced hyperglycemic rat. Activities of cytochrome p450, cytochrome b5, aminopyrine demethylase and aniline hydroxylase were changed by the treatment acetaminophen in hyperglycemic rats. It was also observed that activities of conjugating enzymes as sulfotransferase and UDP-glucuronyltransferase was slightly changes against acetaminophen-induced in hyperglycemic rats. Acetaminophen results in the significantly decrease in the level of hepatic glutathione concentration and √-glutamylcysteon, synthetase activities in hyperglycemic rats. And, glutathine S-transferase, superoxide dismutase and glutathione peroxidase activities were significantly increased against acetaminophen-inducedas in hyperglycemic rats. Glutathione reductase and catalase were not affected for experimental state. Furthemore, acetaminophen highered serum alanine, aspartate aminotransferase, sorbitol dehydrogenase, √-glutamylpeptidase, alkaline phosphatase and lactate dehydrogenase activities in hyperglycemic rats. Key Words: Hepatotoxicity, D/M, Acetaminophen, Glutathione, Glutathlone S-transferase, √-glutamylcystein synthetase

원발성 폐암의 CT상 병기 결정:새로 재정된 TNM 체계와의 비교

신현준,최영칠,전혜정,박정희,김요한,이원진 건국대학교 의과학연구소 1998 건국의과학학술지 Vol.8 No.-

Accurate staging of lung cancer is essential for defining operability, selecting treatment regimens, predicting survival, and reporting comparable end results. Revisions in stage grouping of the TNM subsets in the International System for Staging Lung Cancer have been adopted by the American Joint Committee on Cancer and the Union Internationale le Cancer at 1996. We compared the previous TNM systems with revised stage grouping rules, and tried to applicate the new size-criteria for metastatic lymph nodes in mediastinum. Twenty-two patients were undergone CT stagings by using three different systems of previous, revised, and modified TNM subsets. Ten patients showed different TNM stage by the revised stage grouping rules and seven patients were altered in lymph node stage by the new size-criteria. Recognition of revised stage grouping rules is very important for treatment plan and predicting the correct prognosis.

개질재를 혼입한 재생아스콘의 역학적 특성에 관한 실험적 연구

박승범,조광연,조청휘,김정환,채용주 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

This paper presents the results of an experimental study on the mechanical properties of modified recycling asphalt concrete. Research has been performed to obtain the characteristics of the modified recycling asphalt concrete such as marshall test, indirect tensile test, resilient modulus and wheel tracking test by varying contents of modifier (SBS, SBR) and recycled aggregate(30, 50, 70%). Modified recycling asphalt concrete showed better performance than new asphalt concrete in dynamic stability. Each quality property of the modified recycling asphalt concrete satisfied requirement of pavement construction specification.

성장기 Ⅲ급 부정교합의 고정식 교정 치료 후의 안정성

임용규,이주나,김정일,이동렬 대한치과교정학회 2004 대한치과교정학회지 Vol.34 No.4

본 연구에서는 성장기 골격성 Ⅲ급 부정 교합 환자의 치료 전 측모 두부방사선 계측사진에서 얻을 수 있는 골격성, 치성 분석을 통하여 안정군과 재발군을 구별하여 주는 요소를 찾아 보아 Ⅲ급 부정 교합의 치료시 안정성을 고려한 치료 선택에 도움을 주고자 하였다. 고정식 교정 장치를 통한 전치부 반대 교합 혹은 절단 교합의 골격성 Ⅲ급 부정교합 치료 후 최소 1년 동안 안정된 결과를 보인 안정군 33명과 관찰 기간 동안 절단 교합 이하의 수평 피개를 보인 재발군 22명을 연구 대상으로 하여 비교하였으며, t-test를 시행하여 다음과 같은 결론을 얻었다. 1. 전후방적 골격 형태보다는 수직적 형태, 특히 AB-maxillo-mandibular triangle내의 수직적 형태가 Ⅲ급 부정 교합 치료의 예후에 주요한 결정 인자로 나타났다. 수직 각도 계측 항목에 의한 안정군과 재발군간의 비교에서 유의성 있는 차이를 보인 항목은 AB-MP, ODI로 나타났다(P<0.01). 수직 비율 계측 항목에서도 MP-P/AL, PP-P/AL항목이 유의성 있는 차이를 보였다(P<0.05). 2. 재발의 경향은 교합 평면 특히, 하악 교합 평면이 전하방으로 급경사를 이룰수록 증가했다. 교합 평면 경사도와 관련된 계측 항목에 의한 안정군과 재발군간의 비교에서 OP(L)-PP, OP-PP, AB-PP(L), Wits appraisal 항목이 유의성 있는 차이를 보였다(P<0.05). 본 연구는 전후방 부조화가 아닌 골격성, 치성 수직 부조화가 재발을 예측하는 적절한 기준이 됨을 시사하였다. The purpose of this study was to investigate the predictors of relapse in orthodontic treatment of skeletal Class Ⅲ malocclusion in growing patients. A total of 55 patients were studied and all subjects were divided into two groups according to their stability in the post-treatment stage. Of the sample, 33 patients were included in the stable group and the remaining 22 were assigned to the relapse group. Cephalometric data of the pre-treatment stage was taken and compared between the stable and relapse group. The following results were obtained through t-test: 1. This study presented statistical evidence to show that the major skeletal determinant of prognosis in Class Ⅲ orthodontic treatment was not anteroposterior discrepancy but vertical discrepancy, especially within the AB-maxillo-mandibular triangle. Vertical angular measurements that showed statistically significant differences were AB-NIP and ODI(P<0.01) and the vertical ratio measurements were NIP-P/AL and PP-P/AL(P<0.05). 2. Relapse tendency increased with the steep occlusal plane, especially the steep lower occlusal plane. As to occlusal plane, there were statistically significant differences in OP(L)-PP, OP-PP, AB-OP(L) and Wits appraisal(P<0.05). This study claimed that anteroposterior discrepancy was not necessarily the proper criteria to predict relapse. Vertical discrepancy had a significant effect on post-treatment stability.

Methylosinus trichosporium OB3b에서 세포내 메탄자화효소의 활성 측정

송효학,김경태,박성훈,강정미 釜山大學校生産技術硏究所 1996 生産技術硏究所論文集 Vol.50 No.-

메탄자화균을 이용한 지방족 염소화합물의 분해를 위해 메탄자화균의 일종인 Metlylosirus trichosporium OB3b를 배양하고 메탄자화효소의 활성을 5ml vial을 이용하여 여러조건에서 측정하였다. 기절로 propene을 사용하고 생성물인 propene oxide를 가스크로마토그래프(GC)로 분석하였다. 환원력 공급제로 formate가 첨가될 경우 그렇지 않은 경우에 비해 MMO의 활성이 4-5배 가량 높았고, 최적 pH와 온도는 각각 pH 7.0-7.5, 30℃였다. 기질에 대한 포화상수 Km의 값은 ?????mol/L였고 고농도 propene oxide는 활성을 저해하였다. 균체량이 너무 적으면 GC에서의 분석감도에 문제가 있었고 너무 많으면 산소전달이 제한되므로 MMO 활성 측정값이 저하되었다. 분석에 적합한 최적 균체량은 MMO 활성에 따라 달라지지만 대략 0.3∼0.8㎎/ml 정도였다. In order to determine the optimal assay conditions, the activity of the whole-cell methane monooxygenase(MMO) in Methylosinus trichosporium OB3b was measured under various conditions using gas chromatograph(GC). The enzymatic reaction monitored was propene oxidation to propene oxide and the reaction container was 5ml vial with a PTFE-faced rubber septum. When fermate was added as reducing agent, MMO activity was consistently 4-5 times higher compared to the case that fermate was missing. The optimal pH and temperature were 7.0-7.5 and 30℃, respectively. The dependence of enzymatic activity on propene concentration followed Michaelis-Menten kinetic model and the saturation constant(Km) was observed to be ?????mol/L The enzymatic activity was reduced with increasing incubation time or by high concentration of propene oxide. Considering the sensitivity of GC measurement and mass transfer resistance of gas substrates, proper cell density in the present assay system was estimated to be 0.3-0.8㎎/ml.