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正常胃體部粘膜 특히 胃底腺 上皮의 細胞分裂에 關한 硏究
劉在勳 中央醫學社 1965 中央醫學 Vol.8 No.3
In order to the clarify the many disputed problems concerning the renewal of 'the surface, foveolar and glandular epithelium of gastric mucosa, the mitotic and amitotic division of epithelial cells were observed in the stomachs of man, monkey, rabbit and mouse histologically. The results obtained from five cases are summarized as follows: 1. No cell division of any kind was observed in the surface epithelial cells of the gastric mucosa. 2. Mitoses were found only at the base of foveolae and the neck of the glands, composed of mucoid and undifferentiated cells known as the mother cell of the dividing cells, 3. Mitoses were found in the mouse stomach most frequently and in diminished number in the rabbit, monkey and man in that order. So the number of the mitotic cells in the vertical sections of 10mm mucosa averaged 81, 38, 27 and 11 respectively. 4. Multinuclear cells containing two to five or more nuclei of the same size, form and structure, as a result of amitosis, were found, in contrast to mitotic cells, commonly in the body or base of the gastric glands. 5. In the parietal cells, no mitotic figures were observed in any of the studies cases; the multinuclear varieties were found very often in human stomach, less frequently in monkey and rabbit, and scarcely in mouse stomach. Their number in 10mm vertical sections averaged 37, 27, 25 and 7, respectively. 6. In the chief cells, no mitoses occurred in any of the studied cases also, the multinuclear forms, which were probably overlooked by many investigators, could be found in all the cases in varying numbers, i.e, in the human gastric rmuucosa 6, in monkey 9, in rabbit 3 and in mouse 3 in 10mm vertical sections.
Fabrication of graphene quantum dot-decorated graphene sheets via chemical surface modification
유재훈,장정식 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
A novel approach to link graphene quantum dots (GQDs) with graphene was explored via chemical surface modification of graphene using 1,5-diaminonapthalene (DAN). Interestingly, the population of GQDs increased with increasing the molar concentration of the DAN solution. The synthesized-GDGS was applied to photocatalyst for the degradation of methylene blue (MB) under visible light irradiation. The GDGS showed 1.6 times enhanced photocatalytic performance than pristine GQDs due to influences of graphene such as increase of visible light absorbance, charge separation, and adsorption on organic pollutants. This facile synthetic approach, which connects graphene to GQDs for the first time, is expected to promote the application of GQDs in photocatalyst and also in many other areas.
호텔관리자의 예산참여가 직무몰입 및 성과에 미치는 영향에 관한 연구
유재훈 한국관광산업학회 1996 Tourism Research Vol.10 No.1
This study aims at examining budgetary behavior and attitudes of hotel managers and analyzing effects of budgetary participation on budgetary performance and Budget-Related Behavior. Considering job involvement as a moderator variable it also focuses on relations between budgetary participation and dependent variables, coordination roles. Hotel managers' budgetary participation significantly affects budgetary performance and Budget-Related Behavior in some parts. The role of job involvement as a moderator variable in the relation of budgetary participation, performance and Budget-Related Behavior has resulted in showing some relation between budgetary performance and Budget-Related Behavior. As a conclusion, the budget which quantifies planning activities of the hotel business is meaningful as a guide for adjustment and performance of management activities. each business outlet has its own budgetary system owing to organizational characteristics of the hotel which is departmentalized by the job function, opinions and roles of managers of middle and low levels in each department should be respected. When these managers are participated and cooperated in the process of the budgetary goal setting and evaluation by the budge, the goal of an organization can be successfully achieved.
핀-핀 타입 전기-수력학 프린팅에서 전극 직경 및 유량 변화에 따른 세라믹 나노입자 잉크 패턴의 형상 변화
유재훈,이대영,황정호 한국입자에어로졸학회 2006 Particle and Aerosol Research Vol.2 No.4
Droplet generation by electrohydrodynamic (EHD) spraying has advantages in monodispersity and small size regardless of the nozzle diameter. In this research, we investigated formation and variation of printed patterns formed by the EHD spraying using the ceramic suspension. The pattern lines were formed through cone-jet mode which was one of modes of EHD spraying. The onset voltages at which the cone-jet was achieved and the widths of the ceramic patterns varied with the changes of the flow rates and the diameters of ground electrodes. Under the condition of fixed flow rate and diameter of ground electrode, the widths of patterned lines increased with the increment of applied voltages. As we increased the flow rates (1, 5, 10 μL/min) and the diameters of ground electrode (1, 100, 1,000 μm), widths of patterned line and threshold voltages increased. The differences in width were not as large as those of other conditions.
유재훈 한국관광산업학회 1990 Tourism Research Vol.4 No.1
The purpose of this paper is to make minimum cost of kitchen through the effective kitchen facilities planning and layout of hotels, and equipment to provide the highest quality of food and Beverage Service. In order to carry out the task, this study are as follows: First, kitchen outline. Second, describes the theoritical of kitchen facilities planning. Third, take a look at kitchen design and equipment layout. Fourth, considered of kitchen sanitation and safety. Consequently, through the improvement of work Productivity and the save of costs, effective kitchen facilities planning should results in the promotion of profits in the hotel Food and Beverage department. Finally, I hope that this study may give on little help to the persons concernned of hotel kitchen.