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가토 경골에서 다이오드 레이저 조사가 임플란트의 골유착에 미치는 영향
지성원,오남식,천재식 대한구강악안면병리학회 2008 대한구강악안면병리학회지 Vol.32 No.4
Currently, implants are widely used in dental and medical fields. Especially dental implants are widely used for reconstruction of oral and maxillofacial defects. Many researcher's had studied for raising the osseointegration through various method. It was reported high success rate. Also they study the enhancing the speed of bone remodelling and osseointegration. Low level laser therapy is introduced one of the methods to accelerate the speed of bone remodelling and osseointegration. The purpose of this study was to evaluate the effect of diode laser irradiation about to raise ossoeintegration. Twenty four New Zealand white rabbits which were about 3Kg were used for experiment. Two implants were implanted same side of rabbits tibia. Diode laser was irradiated 1cm diameter, 0.5 watt power, 1 minute duration at periphery of one of implants. Eight rab b its were sacrificed every 2, 4, 8 weeks, made undecalcified sample. We investigated in the undecalcified samples histological and histomorphometrc analysis by light microscope. The results were as follows. 2 weeks, 4 weeks, 8 weeks experimental groups which were showed rapid bone remodelling than control groups. They showed many difference especially in early healing time. Bone Implant contact rate were 47% in 2 weeks experimental group. 28% in 2 weeks control groups, 82% in 4 weeks experimental groups, 62% in 4 weeks control groups, 98% in 8 weeks experimental groups and 84% in 8 weeks control groups then experimental groups show statistically significant difference(p<0.05). Bone remodelling area rate inside the implant threads were 49% in 2 weeks experimental groups. 31% in 2 weeks control groups, 90% in 4 weeks experimental groups, 82% in 4 weeks control groups, 99% in 8 weeks experimental groups and 97% in 8 weeks control groups then 2,4 weeks experimental groups show statistically significant difference(p<0.05). Implant-bone contact length rate and bone remodelling area rate were no significant difference of linear regression equation of control and experimental groups then bone remodelling were different at early healing time but there were no differences of time changes. According to above results, one of the low level lasers diode laser irradiation was effected on the volume of new bone formation in implant interface and between the implants threads. Low level laser irradiation were helpful for initial stage of bone remodelling.
서만중(Manjung Seo),지성원(Seongwon Chi),김영진(Youngjin Kim),박우철(Woochul Park),강호재(Hojae Kang),허창수(Changsu Huh) 한국전자파학회 2014 한국전자파학회논문지 Vol.25 No.5
현재 EMP(Electromagnetic Pulse) 방호시설의 차폐효과 성능 평가를 위해 적용하고 있는 규격들에서는 통상적으로 송신안테나를 시설 외부에 배치하고, 수신안테나를 시설 내부에 배치하여 차폐효과(Shielding Effectiveness: SE)를 측정하도록 규정하고 있다. 하지만 차폐효과 측정 시 방호시설과 외부 콘크리트 구조물 사이에 충분한 공간을 확보하지 못하는 경우, 차폐효과 측정이 불가능하게 된다. 본 논문에서는 송신안테나를 EMP 방호시설 내부에 배치하여 전자파의 차폐효과를 측정할 수 있는 시험방법을 찾기 위해 다양한 시험을 수행하였다. 차폐효과 측정 시 송수신 안테나의 위치에 따른 영향을 비교?분석하기 위해 송신안테나를 EMP 방호시설 내부에 배치하여 차폐효과를 측정한 결과, 외부에 배치했을 때보다 시험주파수 영역 10 kHz~1 GHz에서 전체적으로 평균 ±4 dB 수준의 차이가 발생하는 것으로 나타났다. EMP(Electromagnetic Pulse) protection facility was evaluated according to standard of shielding effectiveness. To comply with the standard, transmitting antenna was placed on outside of protection facility and receiving antenna was placed on inside of protection facility. However, measurement is impossible that place does not have enough space between protection facility and external concrete structure. In this paper, we performed a various of tests that put transmitting antenna inside the EMP protection facility in order to find out test method for measuring the shielding effectiveness of electromagnetic wave. Transmitting antenna was placed on inside of the EMP protection facility for measuring the shielding effectiveness to compare and analyze the impact of the position regarding to the transmitting and receiving antenna. As a result of test, in case that transmitting antenna was placed on inside of the EMP protection facility, it was found that test frequency range 10 kHz~1 GHz were occurred overall average difference of ±4 dB level.
정숙인,오남식,이명현,이은정,조정현,지성원,Jeong, Suk-In,Oh, Nam-Sik,Lee, Myung-Hyeon,Lee, En-Jung,Cho, Jung-Hyeon,Ji, Sung-Won 대한치과보철학회 2008 대한치과보철학회지 Vol.46 No.2
전치부 영역에서의 복합 레진을 이용한 수복물의 표면은 착색과 치태 침착이 적어야 하며 치은 조직에 좋은 내성을 갖도록 평활해야 한다. 레진 수복 후 여러 마무리 방법중 blade를 이용한 방법은 치은과 접해있는 변연 부위의 불필요한 레진을 제거하고 마무리하는데 있어 치은 손상을 최소화하면서 간편하게 이용할 수 있는 방법이다. 본 연구의 목적은 현재 많이 사용되고 있는 nano-hybrid composite resin과 ormocer-based compostie resin 간의 여러 가지 마무리 방법에 있어 blade를 이용한 방법과 polishing을 시행한 경우의 표면 거칠기 및 nano계열과 ormocer 계열 복합 레진의 표면 특징을 비교하는 것으로 실험을 위해 가로 6mm, 세로 3mm, 높이 2mm의 금속 주형을 이용하여 레진 블록을 형성하고 대조군은 상면에 mylar strip을 위치시켜 광중합 하였으며, Ormocer - based composite resin ($Admira^{(R)}$)과 nanohybrid composite resin ($Grandio^{(R)}$)에서는 blade를 이용한 경우와 rubber polishing을 이용한 경우를 실험군으로 하였고, ormocer-based flowable composite resin ($Admira^{(R)}$ Flow)과 nanohybrid flowable composite resin ($Grandio^{(R)}$ Flow)에서는 blade를 이용한 경우, rubber polishing을 이용한 경우와 추가적으로 아무것도 시행하지 않은 경우를 실험군으로 하였다. 레진 블록의 표면은 profilometer 및 SEM을 이용하여 거칠기 및 조도를 비교하였으며 통계분석 하였다. 실험 결과 mylar stirp을 적용한 경우 Ra (${\mu}m$) 평균 값은 ormocer-base composite resin이 $0.25{\mu}m$, ormocer-based flowable resin $0.17{\mu}m$, nanohybrid composite resin $0.24{\mu}m$, nanohybrid flowable resin $0.18{\mu}m$ 였으며 blade를 적용한 경우 평균 값은 각각 $0.43{\mu}m$, $0.37{\mu}m$, $0.48{\mu}m$, $0.41{\mu}m$ 였다. 가장 낮은 Ra (${\mu}m$)은 mylar stirp을 적용한 시편에서 얻어졌으며, blade를 이용한 마무리 방법과 rubber polishing을 시행한 경우와 표면 거칠기 비교시 Ra (${\mu}m$)값에서 통계적으로 유의한 차이를 보이지 않았다 (P>0.05). Nanohybrid composite resin이 blade로 마무리하거나 rubber polishing후 ormocer-based composite resin보다 표면 거칠기 증가율이 좀 더 큰 것을 알 수 있었다. 이상의 결과는 blade를 이용한 마무리 방법이 다른 마무리 방법을 대체할 수 있을 것이라는 것을 보여주며, 이에 따라 본 실험 결과에 한정지어 볼 때 복합레진 수복후 마무리 방법으로 blade를 이용하여 시행하는 것이 적용가능 할 것이라 생각된다. Statement of problem: Proper finishing and polishing enhance both the esthetics and the longevity of restored teeth. Blade finishing technique would be suited for smoothing and finishing. Evaluation of this technique are necessary. Purpose: The purpose of this study was to evaluate the blade finishing and polishing procedures on the surface profile and roughness of ormocer-based composite resin and nanohybrid composite resin. Material and methods: The material included a ormocer-based composite resin ($Admira^{(R)}$ & $Admira^{(R)}$ Flow); a nanohybrid composite resin ($Grandio^{(R)}$ & $Grandio^{(R)}$ Flow). One hundred forty specimens of each group were prepared using a mylar strip and randomly divied into blade finishing and rubber polishing groups (n=10). The average surface roughness (Ra) in micrometers was measured and the surface profile was examined by scanning electron microscopy (SEM) (Magnification ${\times}$ 200). The data were analyzed by Mann-Whitney Test at 0.05 significance level. Conclusion: The results of this study indicated that the mylar strip produced the smoothest surface on all materials and among the finishing-polishing methods was not significanct difference (P>0.05). Ormocer-based flowable composite resin performedthe lowest variability in initial surface roughness among the tested materials.
하이브리드 자동차의 직류변환장치(LDC) 성능 및 신뢰성 평가에 대한 연구
김철수(Chulsoo Kim),박광민(Gwangmin Park),지성원(Sungwon Ji),김찬중(Chanjung Kim),이봉현(Bonghyun Lee) 한국자동차공학회 2013 한국자동차공학회 부문종합 학술대회 Vol.2013 No.5
Low DC-DC converter(LDC) in HEV plays a role in charging the auxiliary battery as a low voltage from the main battery charged to the electric driving motor"s regenerative energy during deceleration and braking of the vehicle. The charged auxiliary battery supplies power to the electronics such as headlamps, air conditioner, power windows, and electric power steering. LDC"s output of degradation and failure in the vehicle can have severe impact on various electronics during driving. LDCs for HEVs compared to general industrial DC-DC converters need to meet the performance of high-efficiency power conversion, vibration, and heat resistance properties and EMI to ensure the reliability within the limited volume to be mounted in the vehicle. In this paper, reliability assessment and performance evaluation factor are established for developing the LDC in HEV. Also the performance testing and analysis about the conventional LDC currently used in a HEV is performed on the status of the vehicle and device. The result will be uesd to compare the developed LDC"s performance.