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코발트-크롬 합금의 표면처리에 따른 열중합형 의치상용 레진과의 전단결합강도
이상훈,황선홍,문홍석,이근우,심준성,Lee, Sang-Hoon,Hwang, Sun-Hong,Moon, Hong-Seok,Lee, Keun-Woo,Shim, June-Sung 대한치과보철학회 2007 대한치과보철학회지 Vol.45 No.2
Statement of problem: For the long-term success of removable partial dentures, the bonding between metal framework and denture base resin is one of the important factors. To improve bonding between those, macro-mechanical retentive form that is included metal framework design has been generally used. However it has been known that sealing at the interface between metal framework and denture base resin is very weak, because this method uses mechanical bonding. Purpose: Many studies has been made to find a simple method which induces chemical bond, now various bonding system is applied to clinic. In this experiment, shear bond strengths of heat-cured denture base resin to the surface-treated Co-Cr alloy were measured before and after thermocycling. Chemically treated groups with Alloy $Primer^{TM}$, Super-Bond $C&B^{TM}$, and tribochemically treated group with $Rocatec^{TM}$ system were compared to the beadtreated control group. The data were analyzed with two-way ANOVA. Result: 1. Shear bond strength of bead-treated group is highest, and Alloy $Primer^{TM}$ treated group, Super-Bond $C&B^{TM}$ treated group, RocatecTM system treated group were followed. Statistically significant differences were found in each treated group(p<0.05). 2. Surface treatment and thermocycling affected shear bond strength(p<0.05), however there was no interaction between two factors(p>0.05). 3. Shear bond strengths of bead-treated group and Alloy $Primer^{TM}$ treated group showed no statistically significant difference before and after thermocycling(p>0.05), and those of Super-Bond $C&B^{TM}$ treated group and $Rocatec^{TM}$ system treated group showed statistically significant difference after thermocycling(p<0.05).
마비 환자의 정상적 보행을 위한 능동형 단하지 보조기 개발
황성재,김정윤,황선홍,박선우,이진복,김영호,Hwang, Sung-Jae,Kim, Jung-Yoon,Hwang, Seon-Hong,Park, Sun-Woo,Yi, Jin-Bock,Kim, Young-Ho 대한인간공학회 2007 大韓人間工學會誌 Vol.26 No.2
In this study, we developed an active ankle-foot orthosis(AAFO) which can control dorsi/ plantar flexion of the ankle joint to prevent foot drop and toe drag during walking. 3D gait analyses were performed on five healthy subjects under three different gait conditions: the normal gait without AFO, the SAFO gait with the conventional plastic AFO, and the AAFO gait with the developed AFO. As a result, the developed AAFO preeminently induced the normal gait compared to the SAFO. Additionally, AAFO prevented foot drop by proper plantarflexion during loading response and provided enough plantarflexion moment as a driving force to walk forward by sufficient push-off during pre-swing. AAFO also could prevent toe drag by proper dorsiflexion during swing phase. These results indicate that the developed AAFO may have more clinical benefits to treat foot drop and toe drag, compared to conventional AFOs, and also may be useful in patients with other orthotic devices.
새로이 개발된 음파 진동 레그프레스의 저항 운동 특성 분석
조영근(Cho Young-Kuen),황선홍(Hwang Sun-Hong),김현동(Kim Hyun Dong),김영호(Kim Young-Ho),민진영(Min Jin Young),김한성(Kim Han Sung),임도형(Lim Dohyung) 대한기계학회 2008 대한기계학회 춘추학술대회 Vol.2008 No.11
Many studies have emphasized the importance of resistive exercise to maintain a healthy human body, particular in prevention of weakening of physical strength. Recently, some studies advocated that an application of vibration as a supplementary means in a regular training was effective in encouraging physical strength. Aim of the current study was, therefore, to identify if an application of vibration in a resistive exercise was effective in encouraging physical strength as that in a regular training. A 3-dimensional virtual lower extremity model for a healthy male and virtual leg-press model were generated and synchronized. Dynamic leg-press exercises on a slide machine with/without extra load and on a footboard with vibration as well as on a slide machine with extra load were analyzed. The results of the current indicated that the application of the vibration on the dynamic leg-press exercise might be not greatly effective in encouraging physical strength, compared with the dynamic leg press exercise with extra load. It was, however, thought that the application of the vibration might be helpful to elderly individuals because the reduced maximum muscle strength appeared by the effect of the vibration may avoid a muscular spasm, which can be driven from a high muscle strength sometimes produced during the leg-press exercise with extra load.
정원복(Won Bok Chung),황선홍(Seon Hong Hwang),김윤성(Yoon Sung Kim),김상식(Sang Sik Kim) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
Loop heat pipes (LHPs) are useful to transfer large heat in the long distance regardless of gravity heat. As the previous study, reversible loop heat pipe (RLHP) could be able to transfer for 2 m with 1200 W (35.5 W/㎠) in the 0.2 m gravitational head range. We had conducted test to figure out heat flux limit applied by sintered metal wick that we had developed for the RLHP. To conduction the heat flux test, we made two LHPs having an evaporator which was applied nickel wick with porosity 67%, average pore size 2.6㎛. The inside of the evaporator wall was designed for micro grooves with circumferential direction and the pitch of the grooves of two LHPs was 0.25 ㎜ and 0.30 each. The condenser of the LHPs had double wall pipe and 10°C coolant had went through. As the result, LHP which had 0.25 ㎜ pitch grooves was better performance than the LPH of 0.3 ㎜ pitch grooves. The maximum heat flux was 73 W/㎠