• Korean Journal of Poultry Science
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• v.19 no.4
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• pp.217-225
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• 1992

This research was carried out to determine the 25-Hydroxyvitamin $D_3$[25(OH)$D_3$] content in liver of broiler Hubbard chicks fed vitamin VD-deficient diet for 31 days in a subdued light room and exposed to UVB light (maximum intensity at 297nm) with dose of 0.204 or 0.408 mJ/$\textrm{cm}^2$(30 or 60 min irradiation) . The lipid in liver collected at 0~138 hr after irradiation was extracted by chloroform-methanol(2：1, v /v) and 25(OH)$D_3$ fraction was separated by Sep-Pak silica cartridge. The 25(OH)$D_3$ concentration was measured by normal phase HPLC. The negative control chicks Presented 25(OH)D$_3$17.5 ng/g liver. When 0.204mJ/$\textrm{cm}^2$ was treated to whole body of chicks, the 25(OH)$D_3$ level was increased to 37.8 ng/g at 12 hr after irradiation, the peak concentration, 40.5 ng /g was appeared at the time of 86 hr, and decreasing trend was shown thereafter until 138 hr, the final time in this study. When 0.408 mJ/$\textrm{cm}^2$ was applied, the 25(OH)$D_3$ content was 36.7 ng /g liver at 12 hr, 61.4 ng/g(maximum value ) was appeared at 42 hr, and 39.5 ng /g at 138 hr. The increased absolute amounts in liver 25(OH)$D_3$ were 23 and 43.9 ng/g as chicks were exposed to UVB light with dose of 0.204 and 0.408mJ/$\textrm{cm}^2$, respectively. Consequently, it was found that when double dose of UVB light was irradiated to the chicks, their liver samples produced nearly double 25(OH)$D_3$ at 42 hr after exposure, and the peak value was presented earlier by 24 hr than that in the low dose treatment.

• Journal of dental hygiene science
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• v.8 no.3
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• pp.207-214
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• 2008

The present study was based on the multicenter study and retrospective method of 200 patients with intraoral minor salivary gland tumors which were received at the Yonsei university dental hospital, Soonchunhyang Bucheon hospital and Yonsei university Severance hospital from 1990 to 2006. In this study, 61.5% of the cases were benign tumor and 38.5% were malignant tumor. Of the benign tumors, pleomorphic adenoma was the most common benign tumor (n=104) and Warthin's tumor, lymphangioma, myoepithelioma and basal cell adenoma were followed. Of the malignant tumors, adenoid cystic carcinoma was the most common malignant tumor (n=32) and mucoepidermoid carcinoma, adenocarcinoma, carcinoma ex pleomorphic adenoma, metastatic adenocarcinoma and acinic cell carcinoma were followed. The most common primary tumor location was palate. The result of this study was compared with other previous reviews and showed some differences.

• Korean Journal of Head & Neck Oncology
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• v.10 no.1
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• pp.25-30
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• 1994

Minor salivary gland tumors vary in their primary sites, histopathology and bilogical behavior. Therefore various factors are considered in selecting the treatment modality and predicting the prognosis. The prognosis of milignant tumors of minor salivary glands are worse than that of such lesions of major salivary glands. Authors experienced 26 cases of minor salivary gland tumors(10 benign tumors and 16 malignant tumors) during the past 7 years and analyzed their clinical characteristics. 1) The palate was the most common site of origin of minor salivary gland tumors (38.5%). 2) The most common benign tumor was pleomorphic adenoma and majority of them occur red in the palate(60.0%) and the remaining occured in the nasal cavity or the paranasal sinuses (30.0%), and the lip ( 10.0%). 3) In the case of malignant tumors the most frequent sites were the nasal cavity or the paranasal sinuses (31.3%) with the following histopathologic frequencies: adenoid cystic carcinoma(56.3%), malignant pleomorphic adenoma(12.5%), mucoepidermoid carcinoma(12.5%), polymorphic adenocarcinoma (12.5%), epthelial-myoepithelial carcinoma (6.25%). 4) Minor salivary gland tumors have high probability of malignancy and tumor extension is important to their treatment.

• The Journal of the Korea Contents Association
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• v.19 no.10
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• pp.685-697
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• 2019

The study aimed to analyze the structure of China's passenger railway network in the years of 2008, 2013, and 2018, respectively. At the same time, it tried to investigate its derivative impact on the patterns of Chinese urban network. The analytical tool was based on the NetMiner4.0. In order to measure network characteristics of China's passenger railway network, it primarily focused on the degree centrality, betweenness centrality, and closeness centrality. First of all, the higher degree centralities, with a few exceptions, were observed in BeiJing, ShangHai, GuangZhou, WuHan, XiAn, ChengDu, HaErBin, and ShenYang over a decade. In contrast, the higher betweenness centralities were recorded in cities of higher development potential including WuLuMuQi, GuiYang, ShenYang, and KunMing. The closeness centrality analyses confirmed the fact that most metropoles like BeiJing, ShangHai, and GuangZhou kept the highest train accessibility during the same research period. At the same time, the opening up of a new stretch of high speed railway network has consecutively strengthened connectivity between BeiJing and TianJin. Owing to unprecedented development of railway traffic and its extensive operations, this study believes that Chinese major cities, without interruption, would pursue a series of urban policy alternatives geared towards railway stations-oriented networking and competitively try to extend their network ranges.

• Journal of the Korea Convergence Society
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• v.13 no.2
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• pp.185-200
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• 2022

The innovative development of museum cultural products is an important way for museums to play the function of cultural communication with their collections. In the context of consumer upgrading, traditional cultural product design and sales methods gradually fail to meet the diverse needs of consumers. This study aims to propose the construction of a customized interactive experience platform for museum cultural products, promote the development of museum cultural products, and facilitate the inheritance and preservation of museum culture. The research methodology analyzes the model and characteristics of existing cultural product customization platforms by collating existing literature studies, and distributes 159 questionnaires to investigate the needs of cultural product consumers, and finally combines the customization experience with existing e-tailing platform systems according to user needs, proposes a theoretical framework and conducts design practice and usability testing using the Shenyang Palace Museum as an example. The findings show that users have a high acceptance of the customized platform for cultural products and that the design of the customized platform can be used to promote the dissemination of the cultural connotations of museums, optimize the personalized user experience of cultural products, and provide new ideas for the development, design, and retailing of museum cultural products. Based on the above findings, this paper suggests that museums' cultural product development can utilize the design model of customized platforms to further enhance consumers' personalized service experience.

• The Korean Journal of Cytopathology
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• v.1 no.1
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• pp.60-67
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• 1990

To evaluate the diagnostic findings of salivary gland tumors, we reexamined aspiration cytology smears of 7 cases of pleomorphic adenoma, 3 cases of adenoid cystic carcinoma, and 3 cases of mucoepidermoid carcinoma, performed during April 1986 to March 1990, which were comfirmed by surgical excision and histologic diagnosis. The results obtained are summarized as follows : 1. All cases of pleomorphic adenoma showed branching cellular clusters of epithelial and myoepithelial cells. Acellular elements including myxomatous and chondroid components were observed. There were no cellular pleomorphism and nucleoli. Keratinizing squamous epithelial cells and keratin pearls were noted. 2. The smears of adenoid cystic carcinoma showed cell bails or cell cords containing a central hyaline core. Nuclear atypism and the nucleoli were frequently observed. There were no keratinizing squamous epithelial cells. 3. The smears of mucoepidermoid carcinoma showed mainly sheets or clusters of intermediate cells and some mucin-producing cells. Some nuclear pleomorphism was observed. Mucinous material and many inflammatory cells were present in the background.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2009.06a
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• pp.452-452
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• 2009

HEV용 리튬 이차전지의 양극물질로서 $LiMn_2O_4$는 일반적으로 사용되고 있는 $LiCoO_2$에 비해 값이 저렴하고 독성이 낮으며, 높은 전압과 좋은 율 특성을 갖는 물질이다. 하지만 고온에서 전이금속인 Mn이 전해액으로 용출되어 급격한 용량감소로 인한 짧은 수명의 단점을 가지고 있다. 흔히 전구체로 쓰이는 $MnO_2$, $Mn_3O_4$, MnOOH등은 전기 분해법을 이용한 EMD가 주로 이용된다. 본 연구에서는 출발 물질로 $KMnO_4$와 $Mn(NO_3)_2$를 수용액 반응을 시켜서 농도, 온도변화에 따른 입자 형상 및 크기와 결정상의 변화를 관찰하고, 화학적 방법으로 얻어진 $MnO_2$와 LiOH를 합성하여 각각의 $LiMn_2O_4$를 비교 분석하고자한다.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.56 no.6
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• pp.1080-1086
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• 2007

The aim of this paper is to establish the optimum fabrication condition of specimens, using the Vapor Deposition Polymerization Method(VDPM), which is one of modesto prepare functional organic thin films using a dry process, and to develop a thin film type humidity sensor which has good humidity sensitive characteristics. The inner part of the film became denser and roughness of the film surface eased as curing temperature increased so that thickness of the film could be made uniform. This also shows the appropriate curing temperature was $250^{\circ}C$. The basic structure of the humidity sensor is a parallel capacitor which consists of three layers of Aluminum/Polyimide/Aluminum. The result of SEM and AFM measurement shows that the thickness of PI thin films decreased and the refraction increased as curing temperature increased, which indicates that a capacitance-type humidity sensor utilizing polyimide thin film is fabricated on a glass substrate. The characteristics of fabricated samples were measured under various conditions, and the samples had linear characteristics in the range of 20-80 %RH, independent of temperature change, and low hysteresis characteristic.

• Journal of the Korean Association of Oral and Maxillofacial Surgeons
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• v.27 no.2
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• pp.174-177
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• 2001

Glandular odontogenic cyst(GOC) is a rare cyst of odontogenic origin, first described in 1988 by Gardner et al. Three glandular odontogenic cysts are presented which were experienced in the Dept. of Oral and Maxillofacial surgery, Yonsei University. The clinical characteristics, radiologic and histopathologic features, and method of treatment are discussed. One occured in the anterior maxilla, others in the mandible body area. One in the anterior maxilla showed swelling and tenderness, others not. All the lesion presented radiographically unilocular radiolucent lesion. Histopathologically, those were lined by nonkeratinizing stratified squamous epithelium of varying thickness showing plaque-like or spherical thickening. Partially, eosinophilic cuboidal cells lined the intraepithelial microcysts. Also, ciliated cuboidal cells and mucinous cells were observed. The cysts were treated by enucleation.

• The Korean Journal of Cytopathology
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• v.9 no.2
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• pp.207-211
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• 1998

Adenoid cystic carcinoma of the uterine cervix is a rare tumor accounting for less than 1% of all cervical adenocarcinoma. This tumor is characterized by aggressive biological behavior with frequent local recurrence or metastatic spread, postmenopausal onset, and occasional association with conventional squamous cell carcinoma. The cytologic diagnosis of adenoid cystic carcinoma in the uterine cervix is often difficult because of negative smear due to intact overlying mucosa, cytologic findings mimicking endometrial cells, and masquerade as squamous ceil carcinoma. Recently we have experienced a case of adenoid cystic carcinoma arising in the uterine cervix, which was identified on the routine Papanicolaou smear and was histologically confirmed by the consequent biopsy. The smear showed abundant cellularity composed of relatively uniform cells. The tumor cells were arranged in small clusters, acini, naked cells, and loose sheets with abortive cribriform pattern. There were scattered globoid basement membrane-like materials and tumor diathesis. The nuclei were pleomorphic and showed hyperchromatic and coarsely granular choromatin with inconspicuous nucleoli. The punch biopsy of the uterine cervix showed typical histologic findings of adenoid cystic carcinoma characterized by tumor nests composed of hyperchromatic uniform basaloid cells, cribriform pattern, and cylindrical hyaline bodies.