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정상 백서 및 담즙성 간경변증을 유발시킨 백서에서 간문맥 결찰시 간장변화에 관한 실험적 연구
채권묵,송훈섭,소병준,문형배 圓光大學校 醫科學硏究所 1996 圓光醫科學 Vol.12 No.2
Portal vein branch ligation has been implicated to stimulate the hypertrophy of the unaffected lobe of the liver, but it has been suggested that the degree of the hypertrophy of the cirrhotic liver would be less than that of the normal liver. So, we tried to induce biliary cirrhotic liver by ligation of the common bile duct for this experiment and to evaluate the difference of the effect of the portal vein ligation among the different experimental rat liver groups. For the experimental study, we used Sprague - Dawley rats which were classified into the two groups. Group A (N = 16): Rats with portal venous branch ligation only. Group B (N=16): Rats with portal venous branch ligation after biliary cirrhosis were made by common bile duct ligation. In order to induce biliary cirrhosis, we ligated the common bile duct ligation in 135 rats and exploratory laparotomy for biopsy was done 3 weeks later after common bile duct ligation and the incidence of biliary cirrhosis was about 40%(54/135). 16 rats with the biliary cirrhotic liver were chosen for further study and one of 5 portal branches was ligated and the rats were sacrificed at different time point(1st, 3rd, 5th, 8th week) after initiation of the experiment, and the livers were removed and examined to find out the gross and histologic changes of the livers. The same procedures were performed in 16 normal rats for control study. In the Group A, the severe inflammatory changes and multiple necrotic foci were shown in the ligated lobe from the 3rd week, and firm nodularity was palpated but hypertrophic changes were not noticed in the unaffected lobe. In the group B, ligated lobe showed the same findings with the group A, but unaffected lobe did not reveal any specific findings. In our experiment, we could induce biliary cirrhosis after common bile duct ligation but we could not examine any hypertrophic changes in the both groups-normal and cirrhotic livers - after portal vein branch ligation. This might suggest that only small portion of necrosis - less than 20% - can not induce compensatory hypertrophy in the unaffected lobe.
LPE법에 의한 InGaAsP/InP 양자우물 구조 성장
김의훈,오차환,문승준,김채옥 漢陽大學校 自然科學硏究所 1997 自然科學論文集 Vol.16 No.-
InGaAsP /InP 양자우물 구조를 액상 에피탁시법으로 성장하여, 그 구조적 특성을 secondary ion mass spectroscopy(SIMS), scanning emission microscopy(SEM), transmission electron microscopy(TEM)을 이용하여 조사하였다. SIMS 결과로 부터 well과 barrier의 interface에서 P와 As의 성분이 매우 급준한 변화를 보이고 있는 것으로 보아 LPE로 성장된 시료의 계면구조도 비교적 잘 control이 되었다고 판단된다. SEM과 TEM단면 사진으로 부터 well과 barrier의 계면 상태가 양호하고 well size가 270Å이고 barrier size가 1200Å임을 알 수 있었다. InGaAsP /InP quantum well structures have been grown by liquid phase epitaxy(LPE) and its structural properties have been studied by SIMS, SEM and TEM. In SIMS measurement, the P - and As-components were varied abruptly between wells and barriers, which means that interfacial structures of sample grown by LPE were controlled very well. From the analysis of cross sectional images by SEM and TEM, we know that the interfaces between wells and barriers are very abrupt and that the thickness of well layers and barrier layers are 270Å and 1200Å, respectively .
송채훈,정혜윤 한국스포츠리서치 2005 한국 스포츠 리서치 Vol.16 No.2
The purpose of this study is to find a way to activate and normalize the physical education programs for the handicapped and it can he summarized as the following. It is a well-known fact that participation in exercise programs by the handicapped contributes to the improvement of their mental state. enhanced adjustment of metabolism. development of muscles, development of aerobic competence and improvement of overall health and physical exercise programs recommended to the handicapped should be implemented in consideration of their effectiveness, safety and interest and all the physical education activities in schools as well as living sports classrooms should be implemented in consideration of types and specific character of disability as well. As the five-day work-week system is spreading, more and more handicapped people are expected to take part in physical exercise programs and some preparations and measures are needed. It is also very important to provide the handicapped with opportunities for exercises in sports facilities and it is desirable to provide living sports facilities for the handicapped to associate with the general public naturally. So it is necessary to develop suitable physical education programs for the handicapped. At present it is very difficult to find an exclusive physical education program for the female handicapped. So it is inconvenient to some extent for them to do exercise as they desire. In consideration of all these things it is necessary to do a wide range of research on the various physical education programs and implement them for the handicapped in various conditions and environments and more professional. medical. psychological and sociological efforts are also needed. In a broad sense, the physical education programs for the handicapped should realize the same principles that can be applied to the general public and this means that the government not only makes it an explicit policy objective to train and employ the handicapped but also help them to take part in recreational and physical education programs as much as possible and should all these above are realized. the physical education for the handicapped will surely be activated.
송채훈,임효택,정명수 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.4
This study aims to examine the relationship among the types of leisure activities of the aged, their satisfaction with leisure, their concentration on leisure and their loneliness. The subject of this study is the aged over 65 years old residing in Jeollanamdo and Gwangju by random sampling and total 520 subjects of 238 men (43.3%) and 282 women (51.3%) are used for the final analysis. The examination method accepts self-test recording and questionnaire to analyze the actual conditions and satisfaction of leisure through direct participation in the leisure program conducted by educational agencies for the aged and the statistical methods used for data analysis include SPSS 10.0 for Windows, t-test and one-way ANOVA. This study obtains the four conclusions through the above methods and procedure as follows: First, it is found that the types of leisure activities according to the demographical characteristics of the aged are sports, health activities, hobby and cultural activities, amusement and social activities, there is no statistical difference according to the presence of spouse, but there are difference in the types of leisure activities enjoyed by the aged according to general characteristics. Second, it is known that there are statistically significant differences in the degree of subjective health, their satisfaction with pocket money and preparation for their old age and those who enjoy leisure activity show low loneliness, feel a considerable satisfaction with leisure and concentrate on the leisure activities.
Y₁Ba₂Cu₄O 고온 초전도체의 임계전류 밀도에 관한 연구
김의훈,김재욱,김채옥 漢陽大學校 基礎科學硏究所 1992 基礎科學論文集 Vol.11 No.-
Y₁Ba₂Cu₄O? 고온 초전도체의 전이온도 Tc?은 자화측정으로부터 84K이었고, 5K와 77K에서의 임계전류 밀도 (Jc)는 Bean의 임계 상태 모델을 이용하여 구했다. 그 값들은 10³~10⁴A/㎠ 범위에 있었으며, Y₁Ba₂Cu₄O?의 임계전류 밀도는 Y₁Ba₂Cu₃O??의 것과 비교해 볼 때 낮았지만, 자기장에는 덜 민감하였다. 또한 임계전류 밀도가 고온에서는 자기장에 매우 민감하나 저온에서는 자기장에 따른 변화가 작음을 관찰하였다. From magnetization measurements, the critical temperature Tc? of high Tc superconductor Y₁Ba₂Cu₄O? was 84K and the critical current densities, Jc, at 5 and 77K were determined using the Bean critical state model. Magnetic critical current densities were in the range 10³~10⁴A/㎠. As compared with the results from Y₁Ba₂Cu₃O??, the Jc values from Y₁Ba₂Cu₄O? were observed to be lower and less sensitive to the magnetic field. At low temperature(5K), the critical current density showed a weak field dependence while the rapid fall in Jc was observed at higher temperatures.
고온 초전도체 Y₁Ba₂Cu₃O에서 Y의 Sm 치환 효과
김채옥,김필수,김의훈,김재욱 漢陽大學校 基礎科學硏究所 1992 基礎科學論文集 Vol.11 No.-
고온 초전도체 Y₁Ba₂Cu₃O??에서 Y를 Sm으로 치환시켰을 때의 수송 임계 전류밀도와 저항의 측정은 각각 77K와 80-160K범위의 온도에서 조사되었다. 그리고 X-선 회절 분석 및 적외선 투과율 측정은 실온에서 수행되었으며, 시료들은 고상 반응법에 의해서 제조되었다. 한편 치환양이 증가함에 따라서 정상상태에서의 저항값은 증가하는 경향을 보였고, 93K 근처에서 초전도 전이온도 Tc를 갖고 있으며, 치환양에 따라 거의 변화지 않았다. 적외선 투과율 측정결과 날카로운 peak들은 472.78~618.53㎝-1범위에 있었다. 이것은 특이할 정도로의 low-lying plasmalike edge와 낮은 에너지의 전자적인 여기가 존재함을 나타내는 것이다. 수송임계 전류밀도는 43.3~123.9A/㎠ 범위에 있었다. 전이온도 Tc에 상자성 불순물의 영향이 거의 없는 것으로 보아 123phase에서 Y가 고온 초전도성에 주된 역할을 하지 않음을 알 수 있었다. The measurements of the transport critical current density and resistivity of high Tc superconductor Y₁Ba₂Cu₃O?? were made at 77K and in the range of 80~160K. X-ray pellet diffraction and IR transmittance measurements were carried out at room tempemature. The samples in which Y is replaced by Sm were prepared by solid state reaction. As substitution content increased, the normal state resistivity was increased and the superconducting transition temperature Tc near 93K did not change significantly with the substitution content. From the infrared transmittance measurements many sharp peaks were observed in the range of 472.78~618.53㎝?. It indicates that unusual low-lying plasmalike edge and low energy electronic excitation exist. The values of transport critical current densities were in the range of 43.3~123.9A/㎠. From the observation of no significant change in Tc with mangetic rare earth impurities, it could be concluded that Y plays no crucial role in the high Tc superconduction mechanisms at the 123 phase.
국산 확산포집기를 이용한 기중 포름알데히드 농도 측정 및 평가
변상훈,임채현,손종렬 高麗大學校 倂設 保健大學 保健科學硏究所 2002 保健科學論集 Vol.28 No.1
The purpose of this study is to investigate if some formaldehyde exists in DONG DAE MOON cloth or dry goods markets, and also to alalyze the function of sampler on the hypothesis that are some formaldehyde in those places. More importantly we did not use the existing method by active sampler but we used the new diffusive sampler that we made. 1. The result of this study showed that some formaldehyde existed in DONG DAE MOON cloth and dry goods markets. Average concentration of formaldehyde was 0.136ppm 2. On the basis that the ministry of labor in Korea recommended the Permissible Exposure Limit(PEL) as 0.1ppm, the value of 0.136ppm exceed the PEL. In conclusion, more many stydies about how formaldehyde effects on human body and what diseases that material cause in the body should be proceeded in addition more stydies using diffusive sampler will be needed in the future
이상훈,정재헌,고영무 대한치과기재학회 1997 대한치과재료학회지 Vol.24 No.1
The purpose of this study was to evaluate the compare the endurance of the commonly used dental magnetic attachments using potentiodynamic polarization method. For this study, 2 kinds of Sm-Co based; Magfit 600 and Magfit 400(G.C.) and 4 kinds of Nd-Fe-B based dental magnetic attachments ; Hicolex Super J(Morita Co.), Magfit EX 600(G.C.), Magfit EX 400(G.C.) and Neomagnet(Preat Corp.) were chosen as a specimen and performed electrochemical corrosion test in 4 electrolyte solutions ; 0.9% NaCl, 1% lactic acid, 0.05% HCI, modified Fusayama's artificial saliva solution. In 4 kinds of electrolyte solutions, the potential scanning was performed starting from -1000mV(SCE) to 1300mV and scan rate was 1.25mV/sec. From this study, we calculated the values of corrosion potential(Ecorr), corrosion rate, pitting potential(Epit), and passivation current density resulted from anodic polarization curves and then obtained physical properties such as changing rate of magnetic flux density, amount of metal ion released, mean average surface roughness values, the changing of surface microhardness values, weight loss of dental magnetic attachments and observed surface of dental magnetic attachments using metallurgical microscope after electrochemical corrosion test. The obtained results were as follows : 1. In potentiodynamic polarization curves, SNM showed the lowest values of pitting potential and the most fast corrosion rate. 2. The amount of released metal was reduced in the order of ME6, SNM, MG4, MG6, ME4 and HSJ and was the greatest in applying the 0.9% NaCl solution and was the least in applying the modified Fusayama's artificial saliva. 3. The order of magnetic flux density was HSJ, MG6, ME6, MG4, ME4, and SNM before corrosion. The decreasing rate of magnetic flux density was the least in case of MG4 and was the greatest in case of SNM after first and second corrosion. The decreasing rate of magnetic flux density of 6 kinds of all magnetic attachments was the least in applying the 1% lactic acid solution. 4. The order of average surface roughness values(Ra) was SNM, MG6, MG4, ME4, ME6 and HSJ before corrosion. Average surface roughness values(Ra) was the greatest in case of SNM and was the least in case of HSJ after first corrosion. ME6 and ME4 showed the greatest increasing rate of average surface roughness values(Ra). 5. The order of average surface microhardness values(V.H.N.) was the least in case of HSJ and was the greatest in case of SNM after first and second corrosion. The decreasing rate of average surface microhardness values of 6 kinds of all magnetic attachments was the least in applying the 1% lactic acid solution. 6. The decreasing rate of weight loss was reduced in the order of ME6, SNM and ME4 after first corrosion and was reduced in the order of ME4, SNM, ME6 after second corrosion. The decreasing rate of weight change showed the greatest in applying the 0.9% NaCl solution and the least in applying the 1% lactic acid after second corrosion. In conclusion, all 6 kinds of dental magnetic attachments showed great decreasing of endurance and much more corrosion resulted in increased the amount of metal ion released, decreased the magnetic flux density, increased the surface roughness values, and highly decreased surface microhardness values and increased the weight loss of dental magnetic attachments. it should be considered that the choice of the commercial dental magnetic attachments was needed properly because their endurance showed differences among each king of products.
임채문,박관,권강훈,정만표 대구대학교 과학기술연구소 1998 科學技術硏究 Vol.5 No.4
In this study, the crosswalk at Hayaong-Yungchun arterial located in Kyungbuk province were chosen as the subject, and the reaction patterns of drivers were analyzed by the survey of the approach velocity of cars, know-reaction time and the geometric structure of crosswalk, and the substitute about the installation of pre-traffic signal at moderate distance for the prevention of the disturbing zone (dilemma zone, option zone) to drivers' pass-stop decision at the yellow-signal-situation was presented. The results are summarized as follows 1. The know-reaction time which is applied to the calculation of the yellow signal time is 1 second in korea generally, but the average time was 1.67 second and the standard variation was 0.38 second at 95 samples of the analyzing area. 2. The comparison between the calculation formula of the yellow signal time which is used in korea and the actual time has 1 second difference.
10대 다운증후군 청소년과 일반 정신지체 청소년의 최대하운동증 심폐반응 연구
송채훈,정혜윤,김보정 朝鮮大學校 스포츠科學硏究所 2006 스포츠科學硏究 Vol.17 No.-
Difference of heart rate and heart rate reaction did not show between two groups in stability. But, Down Syndrome mass of heart rate and breathe rate showed higher than general mental retardation group in treadmill walking test(0%, 3 mph) (p< 0.05). By thing that maximum heart rate, maximum oxygen intake amount, secession ventilation amount, the breath exchange rate etc. are low to keep in mind than general mental retardation group in maximum department of athletics low class test appear and number of testing bench box that take part in this research has been limited, because it is lacking to make reliable conclusion, that it is considered that a depths analysis need to a wider experiment in research after, also, is considered that higher interest and development of suitable exercise program for these about these need so that can keep enrichment of Down Syndrome patients' life and life form.