스테인레스 강(304) 표면에 형성된 부동상태 피막의 조성

안윤선,이경철,지홍근 성균관대학교 기초과학연구소 1989 論文集 Vol.40 No.2

스테인레스 강(304) 표면의 부동상태 성질을 규명하기 위해서 "as received" 상태 표면과 CrO_3/H_2SO_4 용액으로 활성화시킨 표면을 Ar이온으로 깍아 내려가면서 ESCA로 표면원소들의 조성 및 산화상태를 측정하였다. 지금까지의 많은 보고와는 달리 "as received" 상태에서는 O₂분자가 표면층에 깊숙히 침투되어 있음을 발견하였다. 이것은 부동상태 산화피막의 형성과정이 크롬과 철의 상대적 확산 속도차에 의해서도 다르지만, bulk 속으로 산소가 확산되어 들어가는 정도에도 의존함을 나타내는 것이다. In order to study the passive state of stainless steel(304, austenite), the depth profile of surface composition as well as its oxidation state has been investigated by means of X-ray photoelectron spectroscopy. The study has been carried both on a "as received" state surface and surface activated in CrO_3/H_2SO_4 solution. Its has been found contrary to the previous works that a considerable molecular oxygen are penetrated deep into the oxide layer. This is an indication that the passive state oxide- film formation depends not only on the relative diffusion rates of chromium and iron, but also on the diffusion rate of oxygen into the hulk.

상시관측소를 이용한 Single RTK-GPS 정밀도 비교

박운용,차성렬,배경호 東亞大學校建設技術硏究所 2004 硏究論文集 Vol.28 No.1

The plenty of availability and high precision of GPS CORS is the reason why it become important more and more in the fields of surveying widely. In this study. I extracted the arbitrary point's coordinate which is using GPS CORS data. now served in RINEX FORMAT via Inter-Net, with observation network of the existing triangulation and GPS CORS data. Then. with this arbitrary point as reference station. RTK GPS was performed. And I will study VRS-GPS concept which reduces the time and cost in the fields of surveying.

흰쥐 복직근과 대흉근 근섬유 유형에 대한 조직화학적 연구

민병운,박경수,노영복 조선대학교 기초과학연구소 1989 自然科學硏究 Vol.12 No.1

포유동물인 흰쥐의 대흉근과 복직근에 대한 근섬유 특성 및 근섬유 유형별 빈도를 조사하기 위하여 1988년 7월 2일~1988년 10월7일 조직화학적 및 각종 효소조직화학적 염색을 시행하여 조사한 바 다음과 같은 결론을 얻었다. 1. H-E 염색에 의한 근섬유의 유형별 구분은 불 명확하였으나, PAS 염색에서는 양성 반응의 정도에 따라서 세가지 유형으로 구분되었다. 2. Reversed myosin-ATP ase 염색과 SDH염색에서는 TypeⅠ, Ⅱa, Ⅱb의 세가지 유형의 근섬유형이 구분되었다. 그러나 typeⅡ와 Ⅱb의 유형별 빈도는 SDH염색과 Reversed myosin-ATP ase 염색상 상당한 차이가 있는 것으로 관찰되었다. 3. 포유동물인 흰쥐의 복직근과 대흉근의 근 섬유형 구성비는 부위에 따라서 상당한 차이가 있었다. In order to study properties and individual proportions of muscle fiber types on the pectoralis major an rectus abdominis muscle of the rat, vertebrates, histological and each kinds of enzyme histochemical stain (were performed). The following results were obtained : 1. Differentiation of muscle fiber types was not evident in H & E stained specimen. However, three types of muscle fibers were evidently differentiated in PAS stained sections according to the degree of positivity. 2. Muscle fiber of three types (typeⅠ, Ⅱa and Ⅱb) were differentiated in reversed-ATP ase and SDH stain. However, there were considerable difference between SDH and reversed-ATP ase stain properties in proportion of typeⅡa and Ⅱb. 3. The constituent proportions of muscle fibers in rectus abdominis and pectoralis major muscle of the rat were remarkably different according to the portions.

스포츠 참가자의 라이프스타일 특성과 서비스 만족의 관계

윤승원,정경회,이일재,박영표 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.1

The analysis of the customers' mind is crucial in the modern society where marketing strategy is very important for the satisfaction of the customers. the purpose of this study was investigating the relationship between lifestyle characteristics and service satisfaction of sports center customer. To achieve this purpose, the population of this study are the participants of the swimming pool, bowling center, fitness club and golf club among the commercial sports center in Jeonju, Jeollabugdo. They are chosen by the multi-stage stratified random sampling considering the events and region. The valid samples are 420 persons at last among 500 persons except the 80 persons whose validity are determined low. To analyze the data, frequency analysis, factor analysis, t-test, ANOVA, regression analysis and covariance structural analysis are used in this study. In this study, those following results are gathered by analysing the data through above approaches. First, According to the background variation of the sports participator; material service to income, personal service to educational level and occupation, systematic service to sex and educational level, there are significant service satisfactions. Second, Lifestyle characteristics of the sports participator influence on service satisfactions significantly; persuit of the trend, social contact, nervousness and individualism influence on personal service social contact, persuit of the trend, nervousness and sentimentalism on systematic service and the other variations on material service.

음낭외상시 고환파열에 대한 초음파 검사의 진단적 유용성

김경영,한동준,신대은,노준,문형윤,임동훈,김철성,박성운 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.3

Purpose: We determined the use of scrotal ultrasonography in the initial diagnosis and management of testicular injuries due to blunt scrotal trauma. Mateiials and Methods: We reviewed 54 patients of scrotal trauma in the last 8 years. Forty patients were evaluated by ultrasonography preoperatively. A heterogeneous echo pattern of the testicular parenchyma with loss of oval shape, contour definition was the basis for diagnosis of testicular rupture. Among them, 33 cases underwent scrotal exploration and 7 cases were managed conservatively. The remaining 14 patients were evaluated only by physical examination, 8 patients of them were explored immediately because of suspicious testicular mpture. The accuracy of ultrasonography were determined by comparing radiographic interpretations with intraoperative findings. Results: Among the 33 patients who were evaluated by ultrasonography and explored immediately, there were 26 suspected testicular ruptures on ultrasonography. Surgical exploration revealed testicular rupture in 23 and simple hematoma in 10. The testicular rupture was correctly diagnosed by ultrasonography in the 22 cases, and there were 4 false-positive and 1 false-negative diagnoses of testicular rupture. The sensivity and specificity for the diagnosis of testicular rupture are 96% and 60%, and the positive and negative predictive values are 85% and 86%, respectively, Conclusions: Scrotal ultrasonography, with the main radiographic finding of a heterogeneous echo pattern of the testicular parenchyma with loss of oval shape, contour definition, is highly sensitive on the diagnosis of testicular rupture. And it increases the salvage rate for testicular rupture with preservation of the testicular function and prevents delayed complications of chronic pain, atrophy and orchiectomy associated with missed testicular rupture.

남한강 상류수계 박대천의 어류상

박경서,문운기,홍영표,최신석 忠南大學校 環境問題硏究所 2001 環境硏究 Vol.19 No.-

남한강 상류 수계, 박대천 일대를 대상으로 2001년 4월부터 9월까지 총 11개 지점을 대상으로 조사하였으며, 종조성, 어류상과 군집 구조를 분석하였다. 총 7과 25속 33종으로 1570개체가 조사 기간동안 확인되었다. 전체 어류군집 중, 잉어과 어류가 24종으로 전체의 72.7%와 1531개체로 전체의 97.5%를 차지하였다. 전체 종에 대해 0.2%보다 적은 종은 L. andersoni, G. brevibraba, A. koreensis, C. rotundicaudata와 S. microdorsalis를 포함한 11종이었다. 박대천 수계에서 우점종은 상대풍부도가 28.66%로 Zacco temmincki가 우점하였고, Zacco platypus (28.28%)와 C. splendidus (12.55%)가 아우점하였다. 박대천의 각 지류에서, Zacco temmincki는 6개 지점에서, Zacco temmincki는 5개 지점에서 우점하였다. 박대천 수계로부터 총 33종 중 6과 14속 18종(54.5%)이 한국고유종이었다. 박대천에서 확인된 어류의 전체 군집 구조를 분석한 결과, 우점도 3.766, 다양도 0.903, 풍부도 10.012, 그리고 균등도는 0.594이었다. Sampes of the Bakdae-Cheon Stream, the upper Namhan-Gang River of Korea were collected at 11 stations from April to September 2001, and analyzed for the species composition, fish fauna, and species diversity. A total of 33 species (1570 individuals) and 25 genera belonging to seven families were collected during the study period. Cyprinid fishes occupied 72.7% of total 24 species and 97.5% of total 1531 individuals, respectively. The rare species which relative abundance is less than 0.2% of all were 1531 individuals, respectively. The rare species which relative abundance is less than 0.2% of all were about 11 species including Liobagrus andersoni, Gobiobotia brevibraba, Acheilognathus koreensis, Cobitis rotundicaudata, and Silurus microdorsalis. Dominant species in the Bakdae-cheon Stream was Zacco temmincki (relative abundance 28.66%), and subdominant species were Zacco platypus (28.28%), and Coreoleuciscus splendidus (12.55%). In each trivutaries of the Bakdae-cheon Stream, Z. temmincki was dominant species at six stations, and Z. platypus was dominant at five stations. Eighteen Species and 14 genera belonging to six families (51.5%) of total 33 species from the Bakdae-cheon Stream were well known as Korean endemic species. The species dominance (λ), diversity (H'), richness (RI), and evenness index (EI) of the fish community were 3.766, 0.903, 10.012, and 0.594, respectively.

해리성 화학 흡착에 대한 흡착 등온식

안운선,함경희 성균관대학교 기초과학연구소 1988 論文集 Vol.39 No.2

고체 표면을 기체에 노출시켰을 때 일어나는 화학 흡착량을 노출량의 함수로 나타내는 기체 흡착 등온식을 activation complex theory에 입각해서 유도하였다. 이 유도 과정에서는 흡착질 분자가 우선 분자 상태의 precursor state로 흡착되고, 이어서 이 precursor state의 분자가 activated complex state를 거쳐서 해리 생성물로 된다고 가정하였다. Precursor의 농도가 대단히 낮을때는 이 흡착 등온식이 Langmuir 흡착등온식과 비슷한 꼴로 된다는 것을 알게 되었다. 이 흡착 등온식은 다결정 니켈 표면에서의 산소의 해리 흡착 과정에 적용시켜 본 결과, 실험 결과와 비교적 잘 맞았다. An adsorption isotherm which gives the chemisorbed amount of gas on solid absorbents as a function of the gas exposure is derived using the activated complex theory. It is assumed that the chemisorption takes place through a moleculary adsorbed precursor state and the activated complex formed from this precursor state. The isotherm derived in this work redudes to a simple one looking similar to the Langmuir isotherm if the concentration of the precursor state is very low. The isotherm is applied to Ni-O_2 dissociative adsorption system to find a reasonably good agreement with the experimental results.

심장으로 전이된 악성 흑색종의 고식적 절제 1예

이경수,이현희,연태진,남기병,김동운,조명찬 대한순환기학회 2000 Korean Circulation Journal Vol.30 No.9

대학교 가정학 교양과목의 교과내용구성과 수업운영방식 : Focused on Child and Family, Clothing and Textiles, Food and Nutrition, and Housing 아동가족·의생활·식생활·주생활 영역을 중심으로

박경옥,이소은,김은영,김운주 충북대학교 교육·생활연구소 1999 생활과학연구논총 Vol.2 No.-

The purposes of this study were to: (1) analyze students' educational needs and attitude concerning various areas in Home Economics as a college-level liberal education curriculum, (2) provide data concerning future curricula and efficient teaching method. Four areas of Home Economics were investigated: child and family, clothing and textiles, food and nutrition, and housing. The subjects of this study were 478 students of Chungbuk National University, divided by experiences in enrollment of Home Economics and teaching methods (managed by 1-2 teachers vs. team teaching by 4 teachers). The data were collected by questionnaires developed by the researchers and analyzed by frequencies, t-test and x²-test The major findings were as follows: 1) Child and family education, especially the subjects of child-rearing and parents education, was most needed area by students, and this area also got highest score in attitude. 2) In the field of clothing and textiles, the subject of impression management with clothing was needed the most, and the importance of clothing got the highest score in attitude. Also, the students enrolled Home Economics showed more educational needs and practical attitude. 3) In the field of food and nutrition, food safety and sanitation were the most needed subject and safety of foods making got the highest score in attitude. The students enrolled Home Economic showed more educational needs on the subjects of food safety and sanitation, human nutrition and health maintenance and the culture of food and nutrition. 4) Educational need of the students was the lowest in housing area, though the subjects of knowledge on the space planning such as interior design, use of living space, and indoor environments-heat, light and air got most attention. Educational needs and attitudes of the students were affected by student's sex, major (human vs. scientific), and age. 5) Educational needs and attitudes of the students were affected by sociodemographic variables, such as grade, sex, major (human vs. scientific), and age. And teaching method was also found to be an influential factor.

흰쥐에서 심정지후 Pentoxifylline이 뇌의 허혈-재관류 손상에 미치는 효과

정시경,김영민,오동렬,최경호,박승현,이운정,박규남,유은영,이원재,김세경 大韓應急醫學會 1999 대한응급의학회지 Vol.10 No.2

Background: Two major events occurring in the cerebral hemodynamics after successful resuscitation from cardiac arrest are reactive hyperemia and postischemic hypoperfusion. In this study, we examined the effect of Pentoxifylline(PTX) on the rat brain following cardiac arrest. Methods: Fourteen rats were anesthetized and artificially ventilated. Cardiac arrest was produced by chest compression and clamping of tracheal tube for 3 minutes in ketamine anesthetized rats. Circulation was restored by standard cardiopulmonary resuscitation methods. In 7 rats, PTX 10mg/kg was infused at 10min after cardiac arrest(PTX group). In the other 7 rats, same amount of normal saline was infused(control group). Results: In both groups, hemodynamic variables, neurologic deficit(ND) score and histopathologic findings of hippocampal CA1 neurons were observed. Hemodynamic variables and ND score were not significantly different between two groups. Delayed ischemic neurons of hippocampal CA1 were decreased in PTX group(2.2±2.4%) compared with control group(9.1±1.2%). Conclusions: We conclude that PTX prevented development of delayed ischemic neurons in hippocampal CA1 after cardiac arrest. PTX may be useful in emergency situations following cardiac arrest.