Mg 其他 複合材料의 强化材 量 및 分布에 따른 機械的性質特性

안선규,하홍수,김영직,임병수 成均館大學校 科學技術硏究所 1997 論文集 Vol.48 No.1

The effect of different SiC particle size and weight fraction in Mg/SiC particle MMC on the mechanical properties has been investigated. In this study, different particle sizes of 7㎛, 20㎛ and 50㎛ were prepared with various weight fraction of 10wt.%, 20wt.% and 30wt.% for sample preparation. By tension tests, the properties of ultimate tensile stress, yield stress and % elongation were observed and by tension-tension fatigue tests, whose procedures are standardized in ASTM standard 647E-93, the ΔK vs, da/dN curves were also obtained. Finally, the crack propagation paths were observed by optical microscope.

β-Lactam 유도체의 N(1)-C(4) 위치에 한 개의 탄소를 도입한 입체 선택적 고리확장에 관한 연구

하진렬,오선주,김지아,신동수,안철진 昌原大學校 基礎科學硏究所 2003 基礎科學硏究所論文集 Vol.15 No.-

The base induced ring opening of β -1actam derivatives with LDA gave γ-lactam derivatives stereoselectively. The γ -1actam derivatives were formed stereoselectively depending on β-3 substituent of B-lactam derivatives.

개 대뇌겉질에서 Platelet-Derived Growth Factor α-Receptor의 출생 후 발달에 관한 면역조직화학적 연구

윤영,안병수,김인정,양경철,박선홍,김기훈,박도영,김장만,문정석,장인엽,조하영 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

Background and Objectives : The localization of platelet-derived growth factor-α receptor (PDGF-α R) was commonly restricted to oligodendrocyte progenitors during late embryonic and postnatal development. However, several studies recently demonstrated that mature neurons could also synthesize PDGF-α, Materials and Methods : In the present study, to analyze the distributional pattern of PDGF-αR during postnatal development of the canine cerebral cortex, we used immunohistochemistry on sections of canine brain tissue. Results : We found that neurons of various regions of cerebral cortex exhibited the immunoreactivity to PDGF-αR as early as postnatal day 0, and slightly decreased after postnatal day 14. Whereas neuronal PDGF-αR were maintained at all ages, the oligodendroglia-like expression of PDGF-αR could not be confirmed. Conclusion : The localization of PDGF-αR in immature and mature neurons supports the several roles of PDGF during development, protection and survival of neurons.

항만물류 XML/EDI 시스템의 개발

황성진,안선하,박경환 동아대학교 정보기술연구소 2002 情報技術硏究所論文誌 Vol.9 No.2

This thesis investigate Disadvantages of traditional Port Logistics EDI, and introduce how to design and implement XML/EDI system on based Microsoft's Biztalk Framwork in order to solve it. The foundational structure of this system constructed application and Biztalk server. Also flow of data is following: Datas input through application and store to XML-document. The next step transmit XML-document to BizTalk server. BizTalk server work mapping XML-document to standard EDI-document. And standard EDI-document transmit to custom house.

랫드에서 인체 재조합 적혈구 조혈인자, rHuEPO의 13주 정맥투여 아만성독성에 관한 연구

김형식,곽승준,천선아,박현선,한하수,임소영,안미영,김원배,김병문,안병옥,홍성렬,이병무 성균관대학교 약학연구소 1998 成均藥硏論文集 Vol.10 No.1

A recombinant human erythropoietin (rHuEPO) was administered intravenously at dosage levels of 0, 100, 500, and 2500 IU/㎏/day for a period of 13 weeks. There were no observed clinical signs and deaths related to treatment in all groups tested. Decreases in body weight gain and food consumption were observed only in males of 2,500 IU/㎏ group after 2 weeks. In hematological parameters, erythrocyte content, hematocrit values and hemoglobin concentration were dose-dependently increased in rHuEPO treated groups. The ratio between kidney weight and whole body weight was significantly increased in females of 500 and 2,500 IU/㎏ groups. The spleen weight was also increased in both sexes of 500 and 2,500 IU/㎏ groups. However, the absolute weight change of other organs was not observed. In histopathological examinations, the renal tubular basophilia was observed only in males and females of 2,500 IU/㎏ groups. From these results, it is concluded that the no-observed adverse effect level(NOAEL) of rHuEPO is 100 IU/㎏ in rats in the present study.

각종 소화성질환에서의 Campylobacter Pylori의 검출에 관하여

허정욱,강영우,박준호,박승국,하경임,김재룡,안성훈,박선우 啓明大學校 醫科大學 1988 계명의대학술지 Vol.7 No.2

Peptic disorders are among the most common maladies in korea as the world. In most cases their etiologies not be established and their pathophysioolgy remain obscure. Although the persence of fastric bacteria has been logn established, recently campylobacter pylori seems to be etiologic agent of peptic disorders. Campylobacter pylori is visualized in most cases of peptic disorders and not visualized after treatment of bctericidal agents, bismuth compound or metronidazole. We had a following results for identification of campylocacter pylori in stomach and duodenal mcuosa via endoscipc biopsy. 1. We studied 54 patients who had dyspeptic symptoms, 29 males. 2. Most patients are in 5th decades, next in 3rd and 6th in order. 3. Ptients were composed of 27 peptic ulcer, 22 gastitis and 5 gastric carcinoma. 4. Campylobacter pylori was identified in 69% of total patients, peptic ulcer 63%, gastritis 77%, stomach carcinoma leastly.

Survey on the Level of Oral Health and Oral Health Care Attitudes and Behavior of the Interest in Oral Health Education for Elementary School Students

Sun-Ha Ahn,Cheon-Hee Lee 대한예방치과학회 2015 International Journal of Clinical Preventive Denti Vol.11 No.4

Objective: Second grade and 4th grade students to like to help target the oral health status and oral health behavior of the relationship between analysis and oral health education training before and after the oral health care attitudes and interests as the basis for a structured oral health education by research. Methods: This carried out t-test for the oral health status according to grade level, boys and girls, snacking frequency of sugar intake frequency, protect food frequency, relationships with clean food and oral health status was performed one-way ANOVA. Results: Papillary marginal attached index according to gender and grade 2 boys 5.69 points, girl 2.70 points to 2nd grade boys and girls (p=0.007) showed that there is a statistically significant difference in the said oral health education pre-survey students the oral health who have experience in education were 69 people (98.6%), and apply the current brush response was that the ‘Yes’ 50 people (71.4%). Oral health education brushing whether to apply after 64 people (91.4%) have been answered ‘Yes’, the difficulty level of education was the response that 64 people (91.4%) are ‘Likely’, the interesting ‘Fun’ 54 people it responded to (71.4%). Conclusion: Utilizing a variety of oral health and oral health education media when performing causing the interest of students to be effective oral health education program development proposals that need to be made and delivered accurate perception of oral health knowledge, according to the elementary beneficiaries eye level.

Septic Environment of Dental clinics in Korea

Ahn, Sun-Ha 대한임상예방치과학회 2010 International Journal of Clinical Preventive Denti Vol.6 No.1

Objective: The aim of this study is to collect bacteria from tools, equipments, and workers in dental clinics, and compare the amount of bacteria measured by the UltrasnapTM ATP method with the amount of effort put into practice of infection prevention. The results will be provided as basic data to find the current problems of infection prevention in Korean dental clinics and search for ways that will lead to future improvements. Materials and method: Micro-organism was measured by UltrasnapTM ATP swab for Dentist, Dental hygienist unit chair and Dental machine. The Questionnaire was delivered to all subjected dental clinics. Results: Personal trial for anti-septic was revealed as, aseptic in and gloves but not well managed in Mask and gown. However, measured by UltrasnapTM there were few micro-organism in dentist's Mask but some micro-organism were found in dentist's Hands. There is a strong relationship between the trial of staff's antiseptic management for dental instruments and RLU measurement for dental instruments. It means that, if we achieve a higher level of anti-septic for dental instruments, we can reduce the RLU level in each dental instrument, effectively. One thing special is the most relationship in Light Gun Tip. Conclusion: Light gun tip might be a standard to check the hygiene level of septic environment for a dental clinic, because of the high co-relation between the trials for anti-septic and the decreasing the RLU level, at dental clinic.

Relationship between Satisfaction and Stress of Clinical Practice for Some of Dental Hygiene Students

Sun-Ha Ahn,Cheon-Hee Lee 대한예방치과학회 2015 International Journal of Clinical Preventive Denti Vol.11 No.2

Objective: The purpose of this study was to attitudes about clinical practice, satisfaction, and identify the factors that affect the stress analysis and to provide a basis for a more efficient operation than practical subjects. Methods: Conducted a survey of the sophomore 95 people with 4 weeks of clinical practice experience attending the ‘A’ College and ‘K’ College based in the northern part was used in the final 67 analysis. Results: Clinical practice satisfaction of the participants point to 3.28 out of 5, clinical practice stress that there is a statistically significant difference with respect to the type of clinical practice clinical practice satisfaction according to specialty hospitals related characteristics appeared to point to 3.51 out of 5 had appeared (t=2.773, p<0.05), the stress level in accordance with the relevant major characteristics before practicing relieve anxiety level (t=2.741, p<0.05) was found to have a statistically significant difference in the clinical experience and clinical experience with correlation analysis indicated a significant correlation between stress factors, the correlation coefficient for the individual characteristics and practical guidance l=0.209 (p<0.10) was found to have significant correlation. Conclusion: This clinical practice during multilateral institution to examine practical analysis of the characteristics studied by reviewing detailed pre-planning and operational measures to increase the students' clinical practice satisfaction to be effective and desirable education is considered that continued efforts should be supported.

Bonding stregth of orthodontic bracket influenced by fluoride application with iontophoresis method

ahn, Sun-Ha 대한임상예방치과학회 2006 International Journal of Clinical Preventive Denti Vol.2 No.1

Objctives: The authors hve conducted experiments on the shear bonding strength on orthodontic brackets adherence to teeth surfaces before and after fluoride topical application, in other to determine the influence of fluoride application to bracket removal. Methods: 60extracted premolar teeth for orthodontic treatment were collected and divided into longitudinal sections for 120 samples in total, the left half representing the experimental group and the right half representing the control group. The comparison was performed, classifying all teeth into 4 groups, respectively. Group 1, applied 2% NaF solution with the iontophoresis method after bracket adaptation; and group 4, no treatment as the control group. The data were analyzed and compared with a paired t-test. Results: Shear bonding strength of bracket was calculated as 7.7 MPa in the group of bracket bonding before NaF application, and it was less than that of the control group, as 8.9 MPA, in no treatment(P<0.05). Shear bonding strength of bracket was calculated as 8.3 MPa in the group of bracket bonding before NaF application, and there were no significant differences from the control group, in no treatment, as 8.4MPa. Conclusion: It was recommended that fluoride topical application would be conducted after bracket bonding to protect the removal of the bracket for orthodontic patients with a fixed type appliance. But, it was found, there might be acceptable bonding strength, within the optimal bonding force for orthodontic bracket adaptation, on both procedures.