칩 본딩 기술과 COB MCM-L 모듈 제작 ( Chip Bonding Technology and Fabrication of COB MCM-L Modules )

권오원,지용 대한전자공학회 1995 대한전자공학회 학술대회 Vol.1995 No.11

고진공하에서의 MoS2 코팅의 트라이볼로지적 특성 ( Tribological Characteristics of MoS2 Coatings in High Vacuum )

권오원,김석삼,이상로 한국트라이볼로지학회 2000 한국트라이볼로지학회지 (Tribol. Lubr.) Vol.16 No.6

矯正用 接着劑의 引張强度

權五源 대한치과교정학회 1982 대한치과교정학회지 Vol.12 No.1

The requirement of ideal orthodontic direct bonding adhesive should include longevity of bond, ability to withstand a variety of forces, resistance to the degrading effects of the oral environment, and ability to be easily removed without affecting the integrity of the enamel. The purpose of this study was to evaluate the adhesive properties of recently developed 3 orthodontic directbonding adhesives by testing the tensile strength. 75 premolars extracted for orthodontic treatment were used. The tensile strength was tested by Tensilon/UTM-1-10000C after 24 hours from bonding. Following results were obtained; The mean tensile strength of each product was higher than the maximum force (29kg/㎠) exerted on a bracket during orthodontic treatment. The tensile strength of Mono-Lok was statistically higher than Concise and Dyna-Bond, although there was no difference between the tensile strength of Concise and Dyna-Bond statistically. Of the filure, the combination type of failure (68%), where part of the adhesive remained on the tooth and part on the bracket was the most common type. The second type of failure (22.7%) occurred at the toothadhesive interface and the last type of failure (9.3%) occurred at the adhesive-bracket interface.

고진공하에서의 MoS₂ 코팅의 트라이볼로지적 특성 ( Tribological Characteristics of MoS₂ Coatings in High Vacuum )

권오원,채영훈,김석삼 한국트라이볼로지학회 1999 한국트라이볼로지학회 학술대회 Vol.30 No.-

3차원 디지털 모형을 이용한 양악 치조골 전돌자의 치열궁 특성 연구

권오원,이수경,성재현 대한치과교정학회 2006 대한치과교정학회지 Vol.36 No.1

최근 안모의 심미성이 중요시되면서 구순 돌출로 인한 비심미성을 해소하고자 내원하는 양악 치조골 전돌자의 수가 증가하는 추세이다. 그러나 이러한 환자에 대한 연구는 많지 않으며 특히 모형을 이용한 연구는 극히 적다. 모형을 이용하는 연구는 주로 손으로 직접 계측하거나 2차원 평면에서 컴퓨터를 이용하여 측정하였으나 근래에 3차원 레이저 스캐너가 도입되면서 모형을 이용한 연구를 좀 더 빠르고 간편하면서도 정확하게 할 수 있게 되었다. 이 연구는 3차원 디지털 모형을 이용하여 양악 치조골 전돌자의 치열궁 특성을 알아보기 위한 것이다. 양악 치조골 전돌자 20명과 정상교합자 20명을 대상으로 치아 크기, 치열궁 폭경 및 치열궁 길이, 치열궁과 구개의 형태를 비교하여 본 결과 양악 치조골 전돌자는 정상교합자보다 치아 크기가 크고, 하악 견치간 폭경 및 제1소구치간 폭경이 크며 치열궁 길이가 길었다. 그리고 치열궁 형태와 구개 형태에서 정상교합자와 차이를 보였다. Recent beauty trends have caused an increase in the number of bialveolar protrusion patients seeking treatment of lip protrusion. But studies of these patients are not common. Studies using their dental models are especially rare. Dental models have been measured manually or through a computer by digitizing two dimensional images of models. Nowadays, we are able to study dental models more easily and accurately by utilizing the three-dimensional (3-D) laser scanner in dentistry. An investigation was carried out to evaluate the characteristics of the dental arch in a bialveolar protrusion group in comparison with a normal group using 3-D digital models. The normal group was composed of 20 subjects who were selected from students of the School of Dentistry, Kyungpook National University. The bialveolar protrusion group was composed of 20 subjects who visited for treatment at the Department of Orthodontics, Kyungpook National University Hospital. Tooth size, arch width and arch length were measured digitally, and arch shape and the shape of the palate were drawn. Based on the results of this study, the differences of the arch characteristics in the bialveolar protrusion group were that the size of the teeth was larger, mandibular canine width and 1st premolar width were wider, and arch length was longer than in the normal group. And there were differences in the arch shape and the shape of palate between the bialveolar protrusion and normal groups.

矯正用 接着劑의 引張强度

權五源,成在鉉 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1

The requirement of ideal orthodontic direct-bonding adhesive should include longevity of bond, ability to withstand a variety of forces, resistance to the degrading effects of the oral environment, and ability to be easily removed without affecting the integrity of the enamel. The purpose of this study was to evaluate the adhesive properties of recently developed 3 orthodontic direct bonding adhesives by testing the tensile strength. 75 premolars extracted for orthodontic treatment were used. The tensile strength was tested by Tensilon/UTM-1-10000C after 24 hours from bonding. Following results were obtained; The mean tensile strength of each product was higher than the maximum force(29㎏/㎝) exerted on a bracket during orthodontic treatment. The tensile strength of Mono­Lok was statistically higher than Concise and Dyna­Bond, although there was no difference the tensile strength of Concise and Dyna­Bond statistically. Of the failure, the combination type of failure(68%), where part of the adhesive remained on the tooth and part of the bracket was the most common type. The second type of failure (22.7%) occurred at the tooth­adhesive interface and the last type of failure (9.3%) occurred at the adhesive­bracket interface.

Ni-Ti矯正用線材의 超彈性에 관한 硏究

權五源,徐惠敬,李基大 慶北大學校 齒科大學 1987 慶北齒大論文集 Vol.4 No.1

According to the development of the techniques for tooth movement, the research on the orthodontic wires has advanced and the Ni-Ti wire is highlighted these days. The Superelasticity of Ni-Ti wires was studied in tension. The wires were tested by universal testing machine. The elastic modulus was 20×10 exp (3)kg/㎟ in Cr-Ni wires, 21∼25×10(3)kg/㎟ in Co-Cr wires and 5∼6×10 exp (3)kg/㎟ in Ni-Ti wires. The elastic modulus of Ni-Ti wires was opproximately 1/4 of Cr-Ni wires and Co-Cr wires, and the elastic limit of Ni-Ti wires was approximately 4 times of Cr-Ni wires and Co-Cr wires. The permanent strain was approximately 0.5% in stress-strain curve of Ni-Ti wires.

前齒部 開咬를 同伴한 Angle氏 級 下正咬合 治療에 關한 臨床的 考察

權五源 慶北大學校 齒科大學 1984 慶北齒大論文集 Vol.1 No.1

A female aged 21 years and 6 months had a Angle's Class I malocclusion characterized by anterior open bite, anterior crowding, and apical lesion on lower right lst molar. This patient underwent scaling and ?? extaction and multibanded system was placed. She was treated with Broussard technigue. After 12 months, anterior open bite and anterior crowding were corrected, and facial profile was improved. After 16 months, debanding was undertaken. After 6 months from debanding. Band space disappeared and any relapse was not detected.

골격성 Ⅲ급 부정교합자의 O.M.A을 이용한 상악 전방 견인 치료 효과의 장기 관찰

권오원 慶北大學校 齒科大學 1988 慶北齒大論文集 Vol.5 No.1

Author evaluated the effect of O.M.A. on 5 skeletal class Ⅲ malocclusion cases. The results might be as follows; 1. In all cases, forward growth of maxillary complex was accomplished. 2. In almost cases, there were rebound tendencies in maxillary and mandibular basal bone and denture relationships. 3. To minimize the relapse, it is necessary to overcorrection and stabilization after anterior traction.

Development of a Self-contained Sample Preparation Cartridge for Automated PCR Testing

권오원,윤종수,정기수,이동규,이강호,곽봉섭 한국바이오칩학회 2015 BioChip Journal Vol.9 No.4

A self-contained cartridge and an integrated operating prototype for automated molecular testing are described. This newly developed polymeric cartridge consists of multiple chambers self-containing all necessary reagents such as specimens, lysis, wash, and elution buffers. The cartridge is designed for optimal point-of-care testing. The operator can simply load a specimen into a chamber of the cartridge, then install the cartridge, and run the operating instrument. The fluidic movement inside the cartridge including reagents mixing, nucleic acids capturing, wastes-out and eluates collection are controlled by pneumatic actuations of syringe/piston sets and magnet/valve controls. The performance of the sample preparation efficiency on the cartridge was tested using Salmonella bacteria. The cartridge and the operating protocols need further modifications for optimal performance. However, the cartridge and the operating prototype have the potential to become applicable as a sample-in-answer-out tool of molecular diagnostics such as polymerase chain reaction (PCR) or other amplification methods such as isothermal amplification, and further cell-free DNA isolation and analysis.