타이타늄 임플랜트 시편 내부에 설치한 자석의 자성강도에 따른 골형성 변화

황윤태,이성복,최대균,최부병,Hwang Yun-Tae,Lee Sung-Bok,Choi Dae-Gyun,Choi Boo-Byung 대한치과보철학회 2005 대한치과보철학회지 Vol.43 No.2

Purpose. The purposes of this investigation were to discover the possibility of clinical application in the areas of dental implants and bone grafts by investigating the bone formation histologically around specimen which was depending on the intensity of magnetic field of neodymium magnet inside of the specimens. Material and method. 1. Measurement of magnetic intensity - placed the magnet inside of the specimen, and measured the intensity of magnetic field around the 1st thread and 3rd thread of specimen 20 times by using a Gaussmeter(Kanetec Co., Japan). 2. Surgical Procedure - Male rabbit was anesthetised by constant amount of Ketamine (0.25ml/kg) and Rompun (0.25ml/kg). After incising the flat part of tibia, and planted the specimens of titanium implant, control group was stitched without magnet, while experimental groups were placed a magnedisc 500(Aichi Steel Co., Japan) or magnedisc 800(Aichi Steel Co., Japan) into it, fixed by pattern resin and stitched. 3. Management after the surgery - In order to prevent it from the infection of bacteria and for antiinflammation, Gentamycin and Ketopro were injected during 1 week from operation day, and dressed with potadine. 4. Preparation of histomorphometric analysis - At 2, 4 and 8 weeks after the surgery, the animals were sacrificed by excessed Ketamine, and then, specimens were obtained including the operated part and some parts of tibia, and fixed it to 10% of PBS buffer solution. After embedding specimens in Technovit 1200 and B.P solution, made a H-E stain. Samples width was 75$\mu$m . In histological findings through the optical microscope and using Kappa image base program(Olympus Co. Japan), the bone contact ratio and bone area ratio of each parts of specimens were measured and analyzed. 5. Statistical analysis - Statistical analysis was accomplished with Mann Whitney U-test. Results and conclusion. 1. In histomorphometric findings, increased new bone formation was shown in both control & experimental groups through the experiment performed for 2, 4 & 8 weeks. After 4 weeks, more osteoblasts and osteoclasts with significant bone remodeling were shown in experimental groups. 2. In histomorphometric analysis, the bone contact ratios were 38.5% for experimental group 1, 29.5% for experimental group 2 and 11.9% for control group. Experimental groups were higher than control group(p<0.05) (Fig. 6, Table IV). The bone area ratios were 60.9% for experimental group 2, 46.4% for experimental group 1 and 36.0% for control group. There was no significantly statistical difference between experimental groups and control group(p<0.05) (Fig. 8, Table VII) 3. In comparision of the bone contact ratios at each measurement sites according to magnetic intensity, experimental group 2(5.6mT) was higher than control group at the 1st thread (p<0.05) and experimental group 1 (1.8mT) was higher than control group at the 3rd thread(p<0.05) (Fig. 7, Table V, VI). 4. In comparision of the bone area ratios at each measurement sites according to magnetic intensity, experimental group 2(5.6mT) was higher than control group and experimental group 1 (4.0mT) at the 1st thread(p<0.1) and experimental group 2(4.4mT) was higher than experimental group 1 (1.8mT) at the 3rd thread(p<0.1) (Fig. 9, Table IX, X). Experiment group 2 was largest, followed by experiment group l and control group at the 3rd thread of implant. There was a significant difference at the 1st thread of control group & experiment group 2, and at 1st thread & 3rd thread of experiment group 1 & 2, and not at control group experiment group 1.(p<0.1)

슬관절염 환자의 능동신장과 등척성 운동이 관절 기능에 미치는 영향

황윤태,황경옥,Hwang, Yoon-Tae,Hwang, Kyung-Ok 대한물리치료학회 2006 대한물리치료학회지 Vol.18 No.2

Purpose: This study was to investigate the effect of isometric exercise and active stretching on joint function in patient with osteoarthritis. Methods: 30(M=1, F=29) subjects with osteoarthritis were divided in three groups: control group, quadriceps isometric exercise group, and hamstring active stretching group. After 6 weeks treatment, ROM(range of motion) and LSS(lysholm scoring scale) were measured. Results: There was a significant increase in knee flexion, extension in post-treat of quadriceps isometric exercise group and hamstring active stretching group(p<0.05). There was a significant increase in LSS in post-treat of quadriceps isometric exercise group and hamstring active stretching group(p<0.05). Conclusion: This study shows that both the active stretching exercise and the quadriceps isometric exercise effectively promote the range of knee extensions for osteoarthritis patients. Also, as measuring the ROM of knee flexion and extension by exercise methods, there is significant increase from knee flexion and extension in both hamstring stretching exercise group and quadriceps isometric exercise group. The increase of the range of knee is more effective in the exercise of knee extension with hamstring stretching exercise groups. And it is found that there are some difference between the experimental group and controlled group in statistics. As it is concerned with the function of knee extension, supporting and squatting are more effective to promote the both knee extension and flexion in its range. Therefore, this shows that the hamstring stretching exercise is required in general with enforcing the quadriceps at a sickbed in the present.

3차원 마이크로 유체시스템을 이용한 실시간 광학적 분석을 위한 균일한 유동장을 가지는 유체채널 형상에 관한 수치해석적 연구

황윤태(Y. T. Hwang),강현욱(H. W. Kang) 한국정밀공학회 2017 한국정밀공학회 학술발표대회 논문집 Vol.2017 No.5월

적외선 센서와 무선통신을 이용한 열차접근경보시스템 개발

황윤태(Yun-Tae Hwang),황성태(Sung-Tae Hwang),이윤성(Yun-Sung Lee),김도근(Do-Keun Kim),이태규(Tae-Gyu Lee) 한국콘텐츠학회 2017 한국콘텐츠학회논문지 Vol.17 No.11

국내의 철도작업자의 안전사고는 열차 운행 기관사의 부주의, 선로변 작업자의 감각차단 현상 및 신호수의 실수 등으로 인해 추돌사고가 주요 원인으로 매년 꾸준히 발생하고 있으며 이러한 안전사고를 예방할 수 있는 대책 마련이 시급하다. 따라서 철도 작업 시, 선로변 작업자가 청각과 시각적으로 열차접근을 검지하여 열차 접근으로부터 대피 할 수 있는 열차접근경보시스템을 개발하였다. 이 시스템은 철도 작업장에서 1.5km 이상 전후방 선로에 열차자동검지장치를 설치하여 자동으로 열차 진입을 검지하도록 하고 작업장에 설치된 실시간 경보장치에 유무선으로 검지 신호를 전달하도록 하며, 검지신호를 수신한 실시간 경보장치는 LED 경보등 및 사이렌 등으로 작업자에게 경보신호를 주는 방식으로 작동된다. 이전의 시스템에 비해 원거리에 있는 열차접근의 검지가 가능하고 주로 무선통신방식을 채택하여 통신배선작업이 불필요하며 충전식 배터리와 태양광 충전장치를 통해 외부 전원 공급이 어려운 현장의 상황에 적합한 이점이 있다. 시스템의 현장검증을 통하여 열차자동검지장치와 실시간 경보장치의 성능평가를 실시하였고 100%구동을 확인하여 신뢰성을 검증하였다. Safety accidents in railway work continue to increase every year; Engineer’s negligence, trackside worker’s sensory deprivation and signalman’s mistake are the main reasons of such incidents. We consider this problem by far the most urgent matter in railway work because of its steady increase and risk of taking a person’s life. Based on that account, a new alarm system has developed, that is called Railway Access Alarm System, to allow railway workers to sense the access of trains with not only vision, but also hearing. The detector device of this system is installed on both sides of the track locating 1.5km from the workplace. When the train enters the place, the detector device can sense the entering, sending the detect sign of train to the alarm unit, then the alarm unit warns the workers by the LED lighting and sirens. This system has several advantages compared to previous systems. First, it recognizes the train at a long distance. Secondly, there is no need for wiring work since it is a wireless system. At last, the system works by rechargeable batteries and solar charger so that it is installed in the work places where there is no external power supply. Moreover, it is proven that the system is 100% reliable by the successful on-the spot inspection evaluating the capability.

COVID-19팬데믹으로인한 가구유형별소비패턴변화분석: 신용카드소비데이터를중심으로

Yoontae Hwang(황윤태),Ahyeon Song(송아현),Sangmin Kin(김상민),Yongjae Lee(이용재) 대한산업공학회 2020 대한산업공학회 추계학술대회논문집 Vol.2020 No.11

정상 성인의 손목관절 위치가 파악력에 미치는 영향

조용호,황윤태,이미영,김종열,Cho, Yong-Ho,Hwang, Yoon-Tae,Lee, Mi-Young,Kim, Jong-Ryul 대한물리치료학회 2007 대한물리치료학회지 Vol.19 No.2

Purpose: The purpose of this study was to investigate the effect of wrist position on grip strength. A Grip-Strength is measurement of muscle strength in hand. It is evaluated for the motor function and handicap of hand, projection of treatment plan. It is important because correct treatment. Methods: Total 80 college students were participated in this study, who consisted of 40 males and 40 females(age range: $20{\sim}26$). A Grip-Strength Dynamometer was used to measure the grip strength in three wrist position(flexion, extension, neutral position) and two elbow position(supination, pronation). The ANOVA was conducted to determine any significant difference in grip strength between the wrist position and the two elbow position. Results: The results were as follows: 1. The grip strength was affected by wrist position changes. 2. The difference of grip strength according to elbow position Was not significant difference (p>0.01). 3. The grip strength i1l neutral position was strongest among 3 position of wrist (p<0.01). Conclusion: A Grip-Strength was significant difference in wrist position. Pronation position was minimum grip-strength but not significant difference between supination and pronation.

건측억제유도운동이 뇌졸중 환자의 손 기능과 일상생활능력에 미치는 영향

김영미,황윤태,박래준,Kim, Young-Mi,Hwang, Yoon-Tae,Park, Rae-Joon 대한물리치료학회 2005 대한물리치료학회지 Vol.17 No.4

The purpose of this study is to determine the effect of constraint-induced movement therapy on the involved hand function and ADL in stroke patients. Five subjects with fixing unaffected arms by CIMT were assigned to the experimental patient group and the other five patients to control group without fixing unaffected arms. The function of hand for both groups were evaluated by using Jebsen-Taylor hand function test and ADL for both groups were evaluated by FIM(Functional Independence Measure) before and after task practice. In conclusion, results of this study showed that improved hand function and ADL by CIMT in stroke patients. We concluded that CIMT can improved the involved hand function and ADL in stroke patients.

운전 시 브레이크 페달링 속도가 하지 근수축 개시시간에 미치는 영향

성길희,황윤태,박지원,신화경,Sung, Gil-Hee,Hwang, Yoon-Tae,Park, Ji-Won,Shin, Hwa-Kyung 대한물리치료학회 2011 대한물리치료학회지 Vol.23 No.1

Purpose: Driving is essential to maintain independent living status in modern times. Many patients want to know when they can drive again, but it's only possible if they have the ability to control lower extremity muscles. In this study, we compared the effects of velocity on onset time of lower extremity muscles during driving tasks. Methods: Twelve participants (5 male, 7 female) were enrolled. EMGs were used to test the onset time of lower extremity muscles; tibialis anterior, soleus, rectus femoris. To analyze the data, we used two way ANOVA. Results: According to brake pedaling velocity, there was a significant difference in brake response time (p<0.05). Further, when comparing the lower extremity muscles, there was a significant difference in onset time (p<0.05). The order of muscle recruitment was tibialis anterior, rectus femoris, and soleus for achieving maximal velocity, but the order was rectus femoris, tibialis anterior, soleus for achieving submaximal velocity. Conclusion: Brake pedaling velocity has significant effects on onset time of muscle contractions in the lower extremities. We suggested that a future study needs more subjects and more detailed research such as evaluat-ions of visuo-motor coordination and fine motor dexterity.

골격성 3급 부정 교합을 지닌 법랑질 형성 부전증 환자의 복합적 치료

오정환,김학렬,황윤태,김여갑,류동목,이백수,윤병욱,전준혁,Oh, Jung-Hwan,Kim, Hak-Ryeol,Hwang, Yoon-Tae,Kim, Yeo-Gab,Ryu, Dong-Mok,Lee, Baek-Soo,Yoon, Byung-Wook,Jeon, Joon-Hyeok 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.1

법랑질 형성부전증은 전치부 개교합과 같은 골격적인 문제를 자주 동반하며, 이러한 경우 구강악안면외과, 보철과, 보존과, 교정과 의사들이 함께 치료하여야 한다. 본 증례는 법랑질의 약화와 치아 우식증 등의 이유로 일반적인 교정치료를 시행할 수 없어 보철적 방법으로 치료하였다. 보존적, 보철적 방법을 이용하여 술전 교정과 같은 안정된 교합을 형성하였다. 악교정 수술을 시행하고 SAS 등을 이용하여 악간고정을 시행하여 양호한 결과를 얻을 수 있었다. Amelogenesis imperfecta (AI) is a hereditary disease that affects enamel formation. The patients with AI have esthetic and functional problems due to damage of multiple teeth. So most AI patients resolve these problem through the conservative and prosthodontic treatments. In our case, It was difficult to obtain good results in means of conservative and prosthodontic treatments, because the AI patient had skeletal Class III malocclusion. Moreover, because of vertical dimension loss due to severe dental caries and maxillofacial skeletal disharmony, the ordinary prosthodontic treatment was troublesome. So we planned orthognathic surgery to resolve these problems. After the endodontic treatment, temporary restoration was delivered for stable post-operative occlusion. Then orthognathic surgery was done, and final restoration was delivered in stable period. We obtained satisfactory results in esthetic and functional aspects through multidisciplinary management(conservative treatment, prosthodontics and orthognathic surgery).

간헐적 견인과 도수 견인이 요추 추간판 탈출에 미치는 효과

권원안,마상렬,황윤태,Kwon, Won-An,Ma, Sang-Yeol,Hwang, Yoon-Tae 대한물리치료학회 2009 대한물리치료학회지 Vol.21 No.3

Purpose: The purpose of this study was to investigate the effects of intermittent lumbar traction and manual traction on a $L_{4-5}$ herniated disc. Method: The subjects were randomly divided into the intermittent lumbar traction group (n=10) and the manual traction group (n=10). The intermittent traction group had traction-treatment applied for 12 times in the first two weeks, and then 6 times in the next two weeks. The time the traction was applied was for 30 minutes. The manual traction group had flexion-distraction therapy applied for 12 times in first two weeks, and for 6 times in next two weeks. The time the traction was applied was 3 to 6 minutes per treatment. Results: The change of the muscle test (MT), the disc herniation index (DHI) and the sagittal $T_2$ weighted MRI was measured at pretreatment and 4weeks and 12weeks after treatment. Conclusion: We found that intermittent lumbar traction and manual traction could improved the MT and DHI and this could improve the rehabilitation of patients with lumbar herniated disc.