Er:YAG laser 조사에 의한 치은연하치석 제거효과

조인구,김영준,김병국,정현주 전남대학교 치의학연구소 2002 구강과학 Vol.14 No.3

The purpose of this in vitro study was to evaluate the efficiency of Er:YAG laser on calculus removal and the morphologic changes and hardness of the irradiated surface at different power settings. This experiment used human teeth which were extracted due to periodontal disease and had a band of calculus. Forty root slabs (5x5mm^2) were made and divided into control group and irradiated groups. Experimental groups were as follows;Control group (root planing), Group 1 (irradiated with laser at 30mj), Group 2(irradiated with laser at 60mJ). and Group 3(irradiated with laser at 100mJ). Twelve root slabs embedded in resin block were used in each group. Er:YAG laser was applied under water irrigation with the tip held perpendicular to the root surface in contact mode. The treatment time was measured until the calculus was removed completely under naked eyes. The efficiency of calculus removal was evaluated by the time for removal. Morphological changes of laser irradiated site were observed under SEM and the surface hardness was measured using a VH tester. The results were as follows; 1. The efficiency of laser scaling was increased with increasing the energy level of irradiation. (p<0.05) 2. The morphological changes such as carbonization, crater and scale-like defects in the irradiated root surface were frequently observed with increasing the energy level. 3. The surface hardness tended to increase at 60mJ and 100mJ irradiated groups than that of control group. From the results evaluting on the efficiency, morphological change, and surface hardness, lower energy level was suggested f'or the clinical application of the Er:YAG laser in scaling.

우울증 관련 평가도구의 개관

조현주,채정호,전태연 大韓神經精神醫學會 2007 신경정신의학 Vol.46 No.2

Objective : Since a lot of assessment tools for depression have been developed and used, it is difficult to choose the proper and optimal instruments for the purpose of their usage, In order to maximize the effectiveness of assessment for depression, this paper reviewed the characteristics and specific features of currently using tools. Method : The domestically and internationally using assessment tools for depression were reviewed and classified by litera-hire search and clinical experience. Results : Methods of assessment, selecting guides and characteristics of assessment tools for depression were presented. Conclusion : This paper would provide helpful guidelines for selecting the assessment tools. We suggest that it is needed to develop the assessment tools for depression that reflects Korean specific culture and custom.

경작지 내 소규모 수림의 경관생태적 특성 분석

조현주,나정화 경북대학교 농업과학기술연구소 2008 慶北大農學誌 Vol.26 No.-

This research put most emphasis on setting the guidelines for improvement through character analysis of landscape ecology to cope with ecological malfunction of the woodland surrounded in cultivated areas. The results are as follows. 1) As a result of character analysis of the woodland in cultivated area in point of landscape ecology in five case sites, the size of case site 3 is the largest as 3,000㎡ and it is shown that a colony of pine trees which is valuable in terms of ecological, scientific, historic and cultural senses. 2) As a result of analysis on expansibility of woodland in cultivated area, case site 1 is 0.25, the lowest, flexibility is 4, the highest, In order to improve ecological function in woodland, it is regarded that maintaining curve form rather than straight one. 3) As a result of analysis of morphological diversity , case site 5 shows 1.3, the highest. However, the condition of vegetation and emergence frequency of species indicates low value degree. 4) Based on the result of analysis of landscape ecological character like above, the number of guidelines for the woodland in cultivated area is three and vegetation is four.

장기간 댄스스포츠가 호흡순환 기능 및 심폐지구력에 미치는 효과

조현철,김준희,한주희 龍仁大學校 體育科學硏究所 1998 體育科學硏究論叢 Vol.8 No.1

The purpose of this study was to evaluate the effects in respire-circulatory function and cadio-pulmonary endurance capacity. Twelve females(trained 6, untrained 6) participated in dancesport program that is 90min/day, 2day/week for 20weeks. The results were obtained as follow : 1. No significant difference was found in heart rate, ventilation and respiration rate among pretest, after 10 weeks and 20 weeks of dance program and between trained and untrained group. 2. Significant differenced was found in VCO₂between pretest and 20Weeks later in untrained group. 3. There was significantly increased VO₂max in 20 weeks dance program later compared with pretest and significant difference between groups. 4. There was no significant difference in ventilatory threshold and exercise time was not significant difference among trials and between groups. Conclusively, respiro-circulatory function and cardio-pulmonary endurance capacity were not changed at submaximal stage of excise test but those were significantly increased at maximal of exercise test during 20 weeks. Therefore, it is suggested that long term dancesport exercise program is expected more effective on the repiro-circulation function and cardio-pulmonary endurance capacity.

전해 인프로세스 드레싱을 이용한 Optical glass계의 경면연삭에 관한 연구

조주현,원종호,박원규,이진오,김민수,김성수 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

Electrolytic In-process Dressing (ELID) technique for metal bonded diamond grinding wheel has been developed for mirror surface grinding of hard and brittle materials. This study process optical glass in using Electrolytic In-process Dressing. In using to main variable wheel speed(400 rpm ~ 2000 rpm), feed rate(5 μm/min ~ 25 μm/min), depth of cut (3 μm - 15 μm), dressing and spray. we measured surface roughness by Form Talysurf series2. we finded optimum grinding condition to obtain confident surface roughness in representative brittle materials.

노인에서 넘어짐의 원인과 예방

조상현,이현주 연세대학교 보건과학연구소 2002 보건과학논집 Vol.12 No.-

다중 제어루프에 의한 자기부상용 DC-DC 전원장치에 관한 연구

조주현,조정민,전기영,이상집,이승환,오봉환,이훈구,한경희 明知大學校 産業技術硏究所 2004 産業技術硏究所論文集 Vol.23 No.-

The author present a modified multi-loop algorithm including feedforward for controlling a 55kW step down chopper in the power supply of Maglev. The control law for the duty cycle consists of three terms. The first is the feedforward term which compensates for variations in the input voltage. The second term consists of the difference between the slowly moving inductor current and output current. The third term consists of proportional and integral terms involving the perturbation in the output voltage. This perturvation is derived by subtracting the desired output voltage from the actual output voltage. The proportional and integral action stabilizes the system and minimizes output voltage error. In order to verify the validity of the proposed multi-loop controller, simulation study was tried using Matlab simulink.

Renca 마우스 종양모델에서 지구성운동이 종양형성에 미치는 영향

조정제,안현종,김성수,김창주 대한스포츠의학회 2003 대한스포츠의학회지 Vol.21 No.1

Subcutaneous injection of cells from renal adenocarcinoma line, renca, into Balb/c mice induces fast growing solid tumors. This method has been used to speculate the efficacy of cytokine treatment for tumor regression. The present study was designed to investigate the effect of treadmill exercise on tumor growth using renca mouse tumor model. We also examined the expression pattern of several genes related to immune response after exercise training for 4 weeks. Exercise training reduced the size of tumor mass compared to that of non-exercised group in tumor cell recipient mice. Natural killer(NK) cell activity showed no significant difference between exercised and non-exercised groups in tumor cell non-recipient mice. Although NK cell activity of non-recipients was higher than tumor cell recipients, NK cell activity of exercised group was significantly lower than non-exercised group among tumor cell recipients. There were no significant differences in mRNA expressions of cytokines. scavenger receptors, and neuropeptieds which are related to immune response, while mRNA expression of TGF-beta was significantly reduced both in spleen and in tumor mass by treadmill exercise. Based on the results presented in this study, endurance exercise has shown the possibility to suppress tumor formation.

의류제품 소비자의 신뢰와 만족 및 애호도와 구전의 구조적 관계

조현주 服飾文化學會 2003 服飾文化硏究 Vol.11 No.6

The purpose of this study is to show the component and anticipation factors of loyalty and word-of-mouth. Specifically, hypothesis is that trust in a salesperson will influence satisfaction with the salesperson, and the store. And the satisfactions with the salesperson and the store will influence the loyalty to the salesperson and the store. Another hypothesis is that loyalty to a salesperson and a store will influence word-of-mouth. Scale items used in this study were selected from developed scales and were adapted to conforming to the selling situation in the service setting. factor analysis and Cronbach's alpha test were accomplished. A total of 703 samples was used to test the hypotheses. The primary method of statistical analysis to test the hypotheses was a structural equation modeling on LISREL 8.3. The results of the study are as follows: First, trust had an influence en satisfaction with a salesperson and a store. Second, the results suggested that satisfaction with the salesperson and the store influences loyalty to the salesperson and the store. Finally, loyalty to the salesperson and the store influenced word-of-mouth, as predicted.

가정학 정의의 도식적 접근

조현주 경북대학교 사범대학 부속 중등교육연구소 2005 중등교육연구 Vol.53 No.2

본 연구의 목적은 바람직한 가정학의 정의를 내리기 위한 것이다. 먼저 정의의 논리학적인 진술 형식에 관해서 알아보고, 진술형식들을 도식화하여 이 형식에 따른 정의를 내릴 때의 준수 사항들을 제시하였다. 다음으로 선행 학자들이 내린 정의들이 거의 설명적 진술 형식을 취하고 있으므로 이 두 진술 양식을 비교해 보고, 앞으로의 가정학의 발전을 위해 그 정의에 관한 문제들을 제시하였다. 마지막으로 두 가지 정의의 진술 형식을 바탕으로 한 새로운 가정학의 정의를 내려보았다. The purpose of this paper is to make a desirable definition of home economics, For this purpose, the study has surveyed the two modes of statement about the definition of home economics: explanatory and logical. The literary survey has shown that most preceding scholars of home economics used the mode of explanatory statement in defining home economics. So it has diagrammed the way of logical statement and presented articles of observance in making a definition of home economics. Next the two modes of statement have been compared with each other. And some problems of defining home economics have been found out Finally, based on the mode of logical statement, some new definitions of home economics have been suggested for future growth of home economics.