열역학 실험식에 의한 Cd-Zn계의 안정 및 준안정 상태도의 계산

崔舜惇,權海旭,金星秀 嶺南大學校 工業技術硏究所 1986 연구보고 Vol.14 No.2

For quantitative predictions of the metastable features and the compact expression of phase equilibria encountered in the extractive metallurgy of cadmium and zine, the calculations of stable and metastable equilibrium diagrams of the Cd-Zn system are made using the four parameter subregular solution model. Parameters of the thermodynamic functions are derived from the phase diagram data of "Bulletin of Alloy Phase Diagrams" and the enthalpy data of Wittig and Kleppa. Stable equilibrium diagram and thermodynamic quantities re-calculated from the optimized parameters agree with all the experimental data within the errors. Such metastable phase equilibria as the chemical spinodals, the locus of compositions and temperature where the Gibbs energies of the liquid and solid are equal(To), the metastable extensions of the solidus and liquidus curves, and metastable miscibility gaps. Excellent agreement of the calculated solvus boundary data with the experimental data is believed to provide a correct expectation of the metastable phase equilibria.

취업대비 기사자격증 취득을 위한 효과적 학습지도 방안에 관한 연구

홍순욱,윤상원,서용성 永同大學校 1997 硏究論叢 Vol.3 No.1

지난 2년간 STC를 수행하면서 경험한 바에 의하면, 기사시럼을 준비하기 위하여 시중에서 구입한 연습 문제집에 실린 일부 문제들이 내포한 모호성 때문에 많은 학생들이 어려움을 겪고 있다는 것을 알게 되었다. 이는 학생들이 전공지식을 학습하는데 있어서 비효율을 초래하는 주요 요인들 가운데 하나일 것이다. 본 논문은 학생들이 스스로 자신들의 지식을 확장하고 조직화할 수 있도록 「기출문제 수정출제법(PRST)」이라는 새로운 개념을 도입함으로써 그와 같은 부정적인 효과를 최소화하려는 구체적인 노력을 보여주고 있다. PRST는 5단계로 구성되어 있는데, 이를 통하여 학생들과 지도교수는 모호성을 제거하고 문제를 개선하는 작업을 함께 하게 된다. 이를 위하여 시스템적 접근의 관점에서 Dick의 모형을 채택하는데, 이 모형은 교수설계를 위한 기본틀을 제공해 주며, 본 연구에서 다룰 하나의 기능은 그러한 교수설계 모형 가운데 일부가 된다. 교수설계 모형에 있어서 8개의 기능 가운데, 일련의 개선된 연습 문제들을 제작하는 것이 학생들에게 우선적으로 도움이 될 것이라는 관점에서 수업교재의 개발이라는 기능이 가장 긴급하다고 판단되었다. 본 연구의 목적에 부합하는 적절한 연구의 방향과 범위를 결정하기 위하여 기존 문제들에 대한 사전 조사연구가 수행되었다. 그리고 두 과목에 대한 연습 문제집의 제작과 학생들의 학습 동기부여를 위하여 여름방학 STC기간에 PRST가 시험적으로 적용되었다. 제작된 연습 문제집 가운데 하나가 문제집의 양호도라는 측면에서 6개의 7점 Likert척도로 학생들에 의하여 인지적으로 평가되었다. 그 결과, 새로 구성된 연습 문제집이 기존의 연습 문제집보다 여러 각도에서 더 양호하다고 판정된다. 이것은 통계적 적용상의 한계에도 불구하고, 본 연구에서 제안된 PRST 뿐만 아니라 제작된 연습문제집의 질적 부분의 타당성은 최소한 뒷받침된다는 것을 의미한다고 하겠다. By what we have experienced in STC for the last two years, we can see that a number of students have been suffering from the ambiguities of some problems contained in exercise books which are available at the market for preparing the National Certificate of Engineering. This seems one of the primary factors that bring on inefficiencies in learning expertise. This paper reports our concrete efforts to minimize such a negative force by introducing a new concept of「process for Revise of Sample Test(PRST)」, so that students can be able to organize and expand their knowledge in a good manner. PRST consists of five stages that enable students and the instructor work together on improving problems by getting rid of ambiguities. From the viewpoint of systems approach, Dick's model is adopted to provide a framework for an instructional design which designates a function we deal with in this study. Among the eight functions in the model, the development of class material is considered to be most urgent in that it would be of highly benefit to students to make series of improved exercise problems. Preliminary investigation of existing problems is conducted to figure out right direction and scope for the purpose of our research. PRST is, then, tentatively applied during the summer STC not only to produce exercise books for two different subjects, but to motivate students. One of the produced exercise books is examined perceptively by students in terms of goodness using six seven-point Likert scales. The result shows that the newly constructed exercise book is, on the perception basis, likely to be better than existing books. This implies that the quality of the produced book, as well as the proposed PRST, is validated at least positively in spite of statistical limitation.

복강동맥 협착 혹은 폐쇄 환자에서 상장간막동맥으로부터의 측부순환로: 혈관조영술 소견의 분석

송순영,구자홍,정진욱 關東大學校 醫科大學 醫科學硏究所 1999 關東醫大學術誌 Vol.3 No.1

The purpose is to evaluate angiographic finding, various collateral pathways from the superior mesenteric artery(SHA) in patients with celiac stenosis or occlusion. We selected ninety-four patients with angiographic findings of celiac stenosis or occlusion. All patients underwent SMA angiography. Thirteen patients has variations of hepatic artery, which were right hepatic or all of hepatic arteries originating from the SMA. We retrospectively evaluated the types and incidence of dominant collateral routes from the SMA on angiographic finding's. The most common collateral routes from the SMA were via pancreaticoduodenal arcades(PDA) in 59 patients(95%) and dorsal pancreatic arteries(DPA) and their braches in 70 patients(74%). Miscellaneous collaterals other than PDA and DPA were found in 20 patients. All 13 patients with hepatic arterial variation showed miscellaneous collaterals, which were interlobar intrahepatic collaterals(n=11), right-to-left gastric arterial anastomosis(n=2), accessory left gastric artery(n=2) and peribiliary arterial plexus(n=1). Two miscellaneous collaterals in 7 patients with normal hepatic arterial anatomy were the direct aeterial channel between the SMA(n=6) and middle colic artery(n=2). In conclusion, the most common and important collaterals from the SMA are the PDA and DPA in patients with celiac stenosis or occclusion. Presence of hepatic arterial variation is main cause of development of miscellaneous collaterals.

창상 치유에 있어서 메피텔 (Mepitel)??의 효과에 대한 임상적 연구

이승욱,양순재,김용배 순천향대학교 1994 논문집 Vol.17 No.4

The wound healing is one of the oldest concerns of the medical profession. Local wound care in the cutaneous injury, burns, split thickness graft and donor site has been the long standing problem. In a superficial wound, the healing is accomplishied by reepithelialization and migration of epithelial cells which originate from the intact epithelium that surround the wound and from the undestroyed portion of epidermal appendages (hair follicles, sebaceous glands, and sweat glands) within the wound. Dressing materials for superficial wounds should ideally meet the following requirements. As mechanical displacement of the dressing material from the wound bed is impossible it must allow drainage of serous wound exudate and hematoma, and also allow antibacterial solutions to reach the wound. At the time of removal, the dressing should not adhere to the graft and open areas of the wound. For years, fine mesh gauze, vaseline gauze has been the main dressing materials for the cutaneous injuries in our hospital. But, recently we have used a new dressing materials, Mepitel?? which consists of a polyamide net, impregnated with a silicone gel. It has an open structure with 14 pores/cm² each with a diameter of 1.2mm. The advangtage of the material are ease of use, non-adhesion to the wound, very good tolerance, and abscence of pain during dressing changes. This product has been used in our hospital and this paper serves as a report on our early experiences with it.

상백피에서 추출한 단백질 분해효소의 특성

권순경,박상욱,최우영 한국식품영양학회 1998 韓國食品營養學會誌 Vol.11 No.5

상백피에서 추출한 단백질 분해효소의 효소적 성질을 분석하였다. 상백피 추출액으로부터 분리한 단백질 함량은 1.12mg/ml, protease는 비활성도로서 5.14U/mg 수준이었다. 효소의 기질에 대한 특이성은 casein을 100으로 하였을 때 albumin 63, collagen 58, hemoglobin 45, gelatin 36의 비율로 가수분해하여 육류 단백질에 주로 함유된 collagen, hemoglobin을 분해하는 능력이 비교적 큰 것으로 나타났다. 효소의 최적온도는 60℃, 열안정성은 50∼80℃로서 비교적 열에 안정하였다. 효소의 최적 pH는 6.0이었으며 pH 6.0∼7.0에서 안정하였고 pH 9.0 이상에서는 활성이 급격히 저하되었다. 따라서 옛날부터 가정에서 고기를 삶을 때 연회를 위하여 사용하였던 상백피 중에 단백질 분해효소력이 존재함을 확인하였다. Water extract of mulberry tree barks(Morus alba Linne) was studied for its proteolytic activity. Protein content of the extract was 1.12 ㎎/ml and its specific activity was 5.14 U/ml. The enzyme was active on various proteins : the relative acitities were 100 for casein, 63 for albumin, 58 for collagen, 45 for hemoglobin and 36 for gelatin, respectively. These suggested that the ability of the enzyme to hydrolyze meat was relatively high since those are major meat proteins. Optimum pH and temperature for proteolytic activity were : pH 6.0 and 60℃. And the enzyme was stable at the pH range of 6.0 to 7.0 and temperature between 50 and 80℃. Apparent proteolytic activities could support some scientific grounds of traditional application of mulberry tree barks to home cooking for meat tenderization.

체적판매에 대비한 LPG GAS REGULATOR 개발 연구

고순옥 경남대학교 경남지역문제연구원 1999 연구원 논집 Vol.5 No.-

공해가 없고 사용이 편리하고 GAS는 현재 전체인구의 97 2%에 해당하는 1,415만 가구가 사용하고 있으며 GAS소비 또한 매년 19%이상의 높은 신장을 보이고 있다 그러나 전량수입하는 GAS는 한편으로 편리한 반면 그 관리나 사용상에 있어서 잘못관리 하여 많은 안전사고와 재산상의 손실을 초래할 수 있는 양면성을 지니게 되었다 그리하여 정부는 98년말부터 가스의 원활한 공급과 불필요한 낭비 및 안전사고 예방을위해 오는 2000년 말까지 LP GAS의 체적 판매제도를 시행하고자 한다 하지만 국내의 현실은 시장변화에 대하여 능동적 대처하지 못하고 체적판매에 필요한 10kg GAS REGULATOR의 개발이 전무한 관제로 전량 외국에서 수입대체할 환경에 처하는 안타까운 현실에 직면하기 때문에 본 연구개발의 목적은 GAS REGULATOR의 기능적 기술 문제는 우선 국내의 기술로도 해결 되었기 때문에 디자인적 측면에서 고려 되어야 할 사항인 심미적 조형성, 기능성에 접근하여 빠른 시일내에 국내에서 제품의 시장성우위확보를 할 수 있도록 하고자 한다. Gas is an environment-firendly, easy-to use energy source currently used by 97 2% of the population or 14 15 million households and its demand is increasing annually at a rate of over 19% however, while it is easy to use, gas is 100% imported and misuse can lead to various hazards and loss of poperty The government is planning to introduce a " Gas Sale by Volume System"rom the end of 1998 until the end of 2000, to pormote its efficient supply and prevent unnecessary waste and safety hazards However Korea has not been able to successfully adjust to market changes and there is no research in progress aimed at developing a 10kg Gas Regulator which is necessary for a sale by-volume system Hence, Korea has no choice but to depend on imports There fore, after the rechnical problems are solved the object of our study is to design a shape which is aesthetically pleasing while possessing special features there by creating a design that will cominate the domestic market

철봉 드가체프 동작의 운동학적 분석

강순용,박종진,김창욱,최성진 한국운동역학회 2001 한국운동역학회지 Vol.11 No.1

The purpose of this study is to investigate the kinematical variables of the Tkatchev motion on the horizontal bar and the effects of kinematical variables of 1 phase on 2, 3, 4 phases and the effects of kinematical characteristics of every phase on motion the air and re-grasping. The subjects Tkatchev motion were filmed with S-VHS camera at the speed of 60 fields per second and each field is digitalized to 5 fields with from the sum of handstand motion to landing. The Kwon 3D 2.1 version program is employed to obtain 3-dimensional data. Based on the results of this study, the following conclusions are drawn. 1. In the Down swing phase, the maintenance of great vertical downward velocity is an important variable to achieve large angular velocity of body center and it is also proved that the fast downward motion gives advantage in spreading body joints to get great motion power in the next Whip swing motion. 2. In the Whip swing phase, fast upward velocity and fast angular velocity of hip joint will positively affect upswing movement in t he phase. To shorten the distance between horizontal bar and body center helps effective upward motion as well. These also work beneficially in the next phase. 3. In the Releases phase, fast vertical upward velocity until pull back after curving shoulder joint and hip joint at the whip swing and large change of position of body center are important variables to perform high and long flight duration. 4. In the Re-grasp phase, the maximum spread of shoulder joint and hip and the spread of body center to the opposite direction of it helps body center to stay in higher place and to perform large circular flight motion with extended length of time. This ultimately makes effective re-grasping motion happen and connects next motion smoothly.

정신분열증과 우울증의 지각결핍의 비교

이수형,송경의,이형영,하형욱 大韓神經精神醫學會 1984 신경정신의학 Vol.23 No.4

정신분열증 환자의 지각결핍을 타 질환군과 비교해 보기 위하여 1983.6.1부터 동년 8월 31일 까지 전남의 대병원 정신과 외래에 다니는 우울증 환자 20명 국립나주정신병원에 입원한 정신분열증 환자 20명을 임의 선택하여 Garner의 모형을 이용 카드 분류를 시행하고 그 자료를 토대로 수정분류시간, 공제지수, 비율지수 등을 산출하여 변량분석한 결과 다음과 같은 결론을 얻었다. 1. 양 군의 수정시간을 변량 분석한 결과 유의한 차이를 발견할 수 없었다. 2. 공제지수와 비율지수를 변량분석한 결과 과다성 분류와 여과분류에서는 공제지수와 비율지수에서 아무런 유의차가 없었다. 3. 주사분류에서는 공제지수 비교에서 1% 수준에서 비율지수 비교에서 5% 수준으로 우울증의 분류시간이 긴 것으로 나타났다. 이상의 결과를 살펴볼 때 여과기능의 결함이라는 지각결핍은 정신분열증의 고유한 장애가 아닐 수도 있겠다. The perception of stimuli with two dimensions (size and figure) was investigated using Garners card sorting method into schizophrenic and depressive patients. The comparison of three performance indices (redundancy, filltering, scanning) between two study groups revealed that 1) the analysis of variance of the corrected time shows no significant difference between two groups, 2) in redundancy and filtering sorting the subtractive and ratio indices show no significant difference between two groups, 3) in scanning sorting the depressive group shows significantly longer sorting time than schizophrenic group(p<0.01 in subtractive index, p>0.05 in ratio index). The above findings suggest that the previously known perceptual deficit(mainly filtering deficit) may not be specific only to schizophrenia.

Detergent가 NAD의존성 α-glycerophosphate 탈수소효소에 미치는 영향

박수언,이동욱,이희성 중앙대학교 의과대학 의과학연구소 1984 中央醫大誌 Vol.9 No.3

The physical properties and the effects of detergent on the activities of purified NAD-linked a-glycerophosphate dehydrogenase(EC 1.1.1.8, GPDH) from kidney, liver and skeletal muscle of the rat were studied. The activity of this enzyme was measured by the method of White and Kaplan. The enzyme activity of liver (9.65 units/g tissue) was higher than those of other organs, but the highest value of the specific activity was shown in skeletal muscle as 0.058 unit/㎎ protein. These enzymes were purified approximately 167, 286 and 216-fold from kidney, liver and skeletal muscle, respectively, by ammonium sulfate saturation and blue dextran Sepharose column chromatography. These enzymes were composed of two isozymes which have different isoelectric points. Isoelectric points of the two isozymes were 6.5 and 6.7, and the molecular weights were 62,000 and 60,000 daltons. The UV spectrums of the purified enzymes from three organs of the rat showed very simillar pattern. But the representative compounds from three classes of detergents showed different effects on these enzymes. The enzyme of the skeletal muscle was activated by all of the detergents which were studied expect for Triton X-100, whereas the enzymes of the kidney and the liver were not activated or strongly inhibited by all of the detergents. In conclusion, the purified a-glycerophosphate dehydrogenases from the three organs of the rat were the homogeneous proteins out of consideration for physical properties. But the differences in the interaction between enzymes and detergents revealed that there are unsimilarities in the three dimentional structure between the skeletal muscle and those of other two organs inspite of similarities between the enzyme of kidney and that of liver.

사람의 혈관 내피세포에 대한 Rickettsia typhi의 감염

안욱수,이강순,송호연 순천향대학교 1994 논문집 Vol.17 No.4

R. typhi, the etiologic agent of murine typhus, has known to cause fever, headache, maculopapular rash and vasculitis of small blood vessel. The skin rash and vasculitis are thought to be the results of endothelial cell injury from the infection with R. typhi in vivo. R. typhi showed ability to cause cellular injury of cultured human endothelial cells. The endothelial cells used in this experiment wee obtained by collagenase treatment of human umbilical cord veins. These cells were conformed to be endothelial cell by the presence of von Willebrand factor through the immunofluorescent antibody technique and Weibel-Palade bodies under the electron microscopy. Ultrastructural study revealed that there were no evidences of entry and/or escape from endothelial cells of R. typhi in 24 hours through 48 hours after infection. On the contrary, numerous particles implicating R. typhi were observed in large vacuole within endothelial cells at 48 hours after inoculations. Estimating the severe injury of endothelial cells by infection of R. typhi, the endothelial cells seems to be the primary target cells in human disease caused by R. typhi infection.