Improvement of adhesion properties of glass prepared using SiC‑deposited graphite mold via low‑temperature chemical vapor deposition

Kyoung‑Ho Kim,Kuk‑Jin Hwang,Heesoo Lee,Seong‑Min Jeong,이명현,배시영 한국세라믹학회 2020 한국세라믹학회지 Vol.57 No.1

Compression glass molding is a promising technique for mass production of near net-shaped, high-precision, and low-cost optical glass elements. However, the glass molding process causes the damage of glass and the mold during demolding because of the chemical or physical adhesion of the glass to the mold. To overcome this limitation, graphite molds are used owing to their good lubrication and easy machining. However, graphite materials show rapid oxidation at high temperatures in the presence of oxygen. Therefore, in this study, a thin SiC coating layer was deposited on the graphite mold using the chemical vapor deposition (CVD) method to utilize the lubrication properties of graphite and the anti-oxidation properties of SiC. The specimen obtained using the low-temperature CVD method showed high carbon content and good lubrication properties than that obtained using the high-temperature CVD method.

추기복수형 열병합발전 사이클의 부하변동에 따른 엑서지 해석

성현찬,김경훈 國立金烏工科大學校附設生産技術硏究所 1997 産業技術開發硏究 Vol.13 No.-

This paper reports a suitable operating mode and condition through the economic and exergy analysis to a cogeneration power plant cycle with computer simulation. The exergy analysis that permits to predict the exergy losses in each component furnishes information to the quantity and the place of exergy loss. The simulation condition is to generate constant electricity in spite of the load change of process steam when the supply of process steam and pressure of condenser is changed, devided with sixteen kinds of operating modes according to the ratio of process steam by the auxiliary boiler to steam extracted from the high pressure turbine. Performing the computer simulation for the economic and exergy analysis with above condition, the results show that a cogeneration efficiency is increased as process steam supply is increased and the ratio of process steam by auxiliary boiler is decreased. Oherwise, a economics rate and a cogeneration efficiency are decreased as the pressure of the condenser is increased. And the boiler and the condenser have about 96 to 98 percent of the total exergy losses in a cogeneration power plant cycle.

내압 및 수직하중 작용시 Radial Tire Sidewall부 변형의 시간에 따른 변화 연구

성경진,박인정,유현승,김두만 한국 항공대학교 항공산업기술연구소 2001 航空宇宙産業技術硏究所 硏究誌 Vol.11 No.-

본 연구에서는 타이어 sidewall부에 대한 내압 및 수직하중 그리고 시간에 따른 변형율 변화를 strain gage를 사용하여 측정하였다. 결과적으로 타이어에 최초 내압 작용 후 24시간이 지나면서 타이어의 strain 값이 안정되는 것을 확인하였으며 수직하중에 대한 실험 수행 시 1시간 이상 지난 후에 측정해야 하중작용 실험의 영향이 나타나지 않는 것을 확인하였다. 이로서 Strain gage를 이용한 실험 및 해석의 기반을 마련하였다. In this paper, variation of the strain on the radial tire sidewall with inflation pressure and vertical loading has been measured with respect to the time by experiment of method. As a result, the strain was stable after 24 hours, and vertical loading test must be done after I hour later from the prior loading test. The experiment was conducted to verify the deformation behavior experiment analyze method using strain gage. So the basis for the experiment and analysis of sidewall strain was established.

건초 섬유종 1예

문경원,김소연,최유원,명기범,김성현 대한피부과학회 2006 大韓皮膚科學會誌 Vol.44 No.4

교정치료에 따른 미맹출 하악 제3대구치의 위치 변화에 관한 연구

이경원,배성렬,김상철 대한치과교정학회 1996 대한치과교정학회지 Vol.26 No.1

임상교정에서의 원활한 치아배열을 도모하기 위하여 진단과 치료계획의 수립 방향에 따라 제1소구치 혹은 제2소구치 발치 또는 제2대구치 발치 또는 비발치로 치료가 진행된다. 이때 나타나는 하악제3대구치의 위치적 변화 특히 근원심, 협설측 경사도의 변화도를 알아보고자 163명의 교정환자 (비발치군 77례, 제1소구치 발거군 78례, 제2대구치 발거군 8례)의 치료전후 Pantomogram상을 분석하였다. 결과적으로 하악 제2대구치 발거군에서 치료전후 근원심 경사도의 변화가 컸으며, 하악 제3대구치의 초기 근심 경사도는 치료 전후의 근심경사도와 높은 상관성을 보였으며, 치료전후의 근심경사도 변화량과도 높은 상관성을 보였다. 비발치군과 제1소구치 발거군에서 치료전후의 협설경사도 변화의 차이가 인정되었다. 치료전후의 협설경사도 변화는 치료전의 협설 경사도, 치료후의 협설경사도, 치료후의 근심경사도, 치료전후의 근심경사도 변화량과 높은 상관성을 보였다. Most of orthodontic cases are treated with extraction of certain teeth, which influence the pre-eruptive movement of the lower third molar, The purpose of this study was to evaluate the positional change of lower third molar following orthodontic treatment. Pre- and post-treatment pantomograms of 163 orthodontic patients (77 nonextraction group, 78 first premolar-extraction group, 8 second molar-extraction group) were analyzed in terms of the mesidistal and buccolingual angles of lower third molar. The results were as follows. 1. The change of the mesiodistal angle of lower third molar by orthodontic treatment was significant in second molar-extraction group. 2. The mesiodistal angle of lower third molar in pre-treatment was significantly correlated to the mesiodistal angle in post-treatment and/or the change of the mesiodistal angle by treatment. 3. The change of the buccolingual angle of lower third molar by treatment was significant in non-extraction group or first premolar-extrction group. 4. The change of the buccolingual angle of lower third molar by treatment was significantly correlated to the mesiodistal angle in post-treatment, the change of the mesiodistal angle by treatment, the buccolingual angle in pre-treatment or the buccolingual angle in post-treatment.

Diazepam과 Lidocaine이 노인환자의 기관내삽관시 심전도 및 심맥관계에 미치는 영향

김경희,권성범,신용섭,최세진 충남대학교 의과대학 지역사회의학연구소 1995 충남의대잡지 Vol.22 No.1

We selected at random 30 geriatric patients who had received operation under the general anesthesia with endotracheal intubation. The patients were divided into 3 groups. Group 1 (control) had received endotracheal intubation without diazepam and lidocaine. Group 2 had received endotracheal intubation with diazepam. Group 3 had received endotracheal intubation with lidocaine. The changes of arterial blood pressure and pulse rate, and the appearance of arrhythmia were compared in each group. The results were as follows : 1. The increase of blood pressure and heart rate were less in group 2, 3 than the control group which showed significant increase of blood pressure and heart rate with endotracheal intubation. 2. The incidence of arrhythmias with endotracheal intubation was less in group 2(20%), group 3(50%) than the control group(80%). 3. The electrocardiographic change in the group 2 and 3 were not significant compared to group 1(control).

프리스트레스 흙막이工法의 특성 硏究 : 적용사례를 중심으로 Focus on the Case Study

유현경,조성수,강경인 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

The building is getting bigger and higher in urban areas to promote efficiency of land. As a building was built in urban areas. it was built in very close proximity. At stage of underground work, it's extremely necessary to improve retaining wall for raising the quality of construction. The Braced Wall System largely used in Korea because of suitability of construction in close proximity but it can't serve enough space to work. So in this study, a new retaining wall method using Prestress Wales compares with Braced Wall System under several aspects such as time for completion, construction cost, and stability.

공간통사에 의한 공간분석에서 수직통시의 적용 : 아트리움적 공간에 있어서 Case of Atrium-like Space

손윤경,장성준 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.1(계획계)

The purpose of this study is to suggest application of "vertical vision" in space analysis when we use Space Syntax as a key method. As a case study we chose a lecture building in a university campus, and analyzed space organization in three ways of floor plan assumption: for each applied normal way analysis and also new "vertical vision" analysis: We found that this new trial represents better than normal method in case of "atrium-like" major space in a building in terms of integration.

0.5% Timolol과 2% Dorzolamide의 병용투여군과 cosopt®단독 투여군에서의 안압 하강 효과비교

서정성,최광주,나경수,조남수 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

ackground and Objective: This study was designed to compare the IOP decreasing effect between the IOP decreasing effect of patients who were treated with 0.5% Timolol and 2% of Dorzolamide and that of patients who were treated with Cosopt® only being the patients who couldn't be controlled by Timolol adequately. Materials and Method: Twenty eight open angle glaucoma patients, 40 eyes, who weren't able to reach desirable IOP when treated with 0.5% Timolol, were tested. The patients were divided into two groups. In group A 13 patients, 20 eyes, were treated with Timolol and 2% Dorzolamide. In group B 15 patients, 20 eyes, were treated with Cosopt® only. The IOP and side effects were recorded after The 1st week, the 1st month and the 3rd month. Results: After 3 months, the IOP in group A was decreased by 20.5% (4.0mmHg) from 19.5mmHg to 15.5mmHg and the IOP in group B was decreased by 23.7% (4.7mmHg) from 19.8mmHg to 15.1mmHg. There was no statistical significance between the two groups. Conclusion Cosopt® has a similar IOP decreasing effect with that of 0.5% Timolol and 2% Dorzolamide combined. It may increase adaptation of patients by decreasing the number of dispensions.

장애대학생과 일반대학생의 친구관계 : 친구의 지원, 갈등해결전략 및 만족감

강성구,임경원 국립특수교육원 2006 특수교육연구 Vol.13 No.2

이 연구에서는 장애인의 대학 진학이 점차 확대되면서 이들과 관계를 맺고 있는 대학생들의 친구의 지원, 갈등해결전략 및 만족감의 특성을 조사하고자 하였다. 장애인과 같은 학과에 재학 중인 대학생 145명을 대상으로 친구의 지원, 갈등해결전략 및 만족감에 관한 설문조사를 실시하였으며, ① 장애대학생 친구의 장애유형, ② 성별, ③ 장애인을 접한 이전경험에 따른 친구관계의 질과 갈등해결전략 및 만족감의 차이를 분석하였다. 분석 결과, 첫째, 장애대학생과의 친구관계에서 친구의 지원은 주로 '도움' , '교재의 즐거움' 순으로 나타났으며, 갈등해결방식은 '지배' , '양보' 의 순으로 나타났다. 둘째, 장애인을 접한 경험은 장애대학생의 친구관계의 질적 측면에서 큰 영향을 주지 못하는 것으로 나타났다. 셋째, 일반대학생의 성별에 따라 친구의 지원, 갈등해결방식, 만족감에 차이가 있으며, 남학생들은 '회피' 와 '지배' 전략 순으로 사용하고, 여학생들은 '양보' 와 '지배' 전략 순으로 사용하는 것으로 나타났다. We examined that friendship supports, conflict-resolution styles, and friendship satisfaction in college student and college students with disabilities. We revised McGill Friendship Questionnaires for college students with disabilities. This were completed by 145 college student with non-disabilities. and The data were analyzed by ANOVA. The major results were as follow: first, by and large They acquired more 'helping', 'the pleasure of relationship' and tend to use 'dominating ' and 'avoiding' way of conflict resolution. second, In terms of sex differences, female students reports lower friendship supports than did male students. and female students tend to use 'giving in' and 'dominating' way of conflict resolution evade on the other hand, male students tend to use 'dominating' and 'avoiding' way of conflict resolution third, The experience that participant met person who have disabilities in past were not helpful to friendship in college student and college students with disabilities.