동종 건 및 골 이식을 이용한 관절경적 전방 십자 인대 재건술

김용훈,김근우,민학진,윤의성,조국형,민수기,김일명 ( Yong Hoon Kim,Keun Woo Kim,Hak Jin Min,Ui Seoung Yoon,Kook Hyeung Cho,Su Gi Min,Il Myung Kim ) 대한슬관절학회 1997 대한슬관절학회지 Vol.9 No.1

From June 1994 to December 1995, we perfoimed arthroscopic anterior cruciate ligament reconstruction using B-T-B alIograft in nineteen patients and postoperative aggressive rehabilitation program including early range of motion(ROM) exercise and muscle strengthening exercises in all cases. Except six cases of loss of follow-up, thirteen cases were analyzed. Postoperative results were evaluated by Lysholm knee score and M?ler s criteria at average 14 months(range from 6months to 24 moths). The average Lysholm score improved from 56 to 79. According to the Miijer s criteria, the results were excellent in 7 cases, good in 5 cases and fair in 1 case. We concluded that the reconstruction of the anterior cruciate ligament using B-T-B allograft could be an effective method with many benefits in treatment of anterior cruciate ligament rupture and that the results using B-T-B allograft was as good as those using autograft. But, further evaluation and long teim follow-up should be needed.

랫드에서 Perfluorooctanoic Acid의 독성에 관한 연구

김용훈,조은상,김아영,김성환,박민식,조성환,류시윤,정주영,손화영,Kim, Yong-Hoon,Cho, Eun-Sang,Kim, A-Young,Kim, Sung-Hwan,Park, Min-Sik,Cho, Sung-Whan,Ryu, Si-Yun,Jung, Joo-Young,Son, Hwa-Young 대한수의학회 2008 大韓獸醫學會誌 Vol.48 No.3

Perfluorooctanoic acid (PFOA), a member of the perfluoroalkyl acids that have wide commercial applications, is persistent organic pollutants widely spread throughout the environment and human population. But little is known about the adverse biological effects of the PFOA. In the present study, the toxicological effects of PFOA were investigated in rats. Sprague-Dawley rats (N = 10 in each group) were orally administered with PFOA in drinking water for 4 weeks (0, 100, 200, or 400 ppm in male, and 0, 200, 400, or 800 ppm in female). Three female rats given 800 ppm died during the study. PFOA treatment decreased the body weight gain and increased the liver weights in both genders. Serum biochemical investigations revealed significant increases in the aspartate aminotransferase, alanine transaminase, alkaline phosphatase, blood urea nitrogen, total cholesterol, and total bilirubin in male but in female. Serum estradiol (E2) levels were increased in all treated rats. Histopathologically, hepatocellular hypertrophy around central vein was noted in the liver of treated rats. No significant histopathological changes were noted in other organs. In conclusion, PFOA induced toxicological changes in the liver and increased serum E2 level which was not related to histopathological changes of endocrine and reproductive system.

Posterior stabilized 인공 슬관절 치환술후 후방 아탈구 - 1례 보고 -

김용훈,김근우,민학진,윤의성,염진섭,최형택 ( Yong Hoon Kim,Keun Woo Kim,Hak Jin Min,Ui Seoung Yoon,Jin Sup Yeom,Hyong Tack Choi ) 대한슬관절학회 1996 대한슬관절학회지 Vol.8 No.2

Posterior subluxation of the posterior stabilized total knee arthroplasty is rare, in only several cases reported in the literature. The authors present one case of bilateral posterior subluxation in this type prosthesis. Reduction was gradually accomplished by applying skin traction. No redislocations have occurred at follow-up.

A/R 코팅 변화에 따른 200MHz AOM의 laser damage threshold 증가

김용훈,이항훈,이진호,박영준,박정호,Kim, Yong-Hun,Lee, Hang-Hun,Lee, Jin-Ho,Park, Yeong-Jun,Park, Jeong-Ho 한국재료학회 1997 한국재료학회지 Vol.7 No.3

200MHz 응향광변조기 (AOM: Acousto-Optic Modulator)는 제 2고조파(SHG: Second Harmonic Generation)녹색 레이저와 함께 DVDR(Digital Video Disk Recorder)에 적용되어 고밀도 광기록용으로 사용되었다. 이러한 고밀도 광기록 장치로써 사용되기 위해서는 고출력 레이저의 사용이 필수적이며, 레이저 빔이 통과하는 각 광학 소자들의 코팅막은 고출력 레이저 빔에 대해 높은 레이저 damage threshold를 가져야 한다. AOM의 음향공학재료로 사용되는 $TeO_{2}$단결정에 코팅막의 종류 및 증착조건을 변화시키며 E-beam 증착법으로 A/R코팅 시편을 준비하였다. 0.55W의 입력 power를 갖는Ar레이저를 사용하여 코팅의 광손상 정도를 확인하였다. $AI_{2}O_{3}$막에 비해 $ZrO_{2}$와 $SiO_{2}$막을 사용한 경우 레이저 damage threshold는 크게 향상되었다. 또한 AOM모듈을 제작 후 구동회로와 연결하여 약 20mW의 SHG power를 입력시키며 출력 power long term안정성을 측정하였다. AOhf(Hcousto-r)l)tic niodulator) with :!OOlIiz freclucncl- and Sfi(;(Seconrl harmonic generation) green lasel-Lvith 53% nm wavelength were used for Il\'IIII~Dii.it,ii v~ilco disk recorder) FOI rhe appli~aptin of high densit]. optical recording, a high po\ver I ~ c r is r c ~ ~ l i ~ i l - u l ic I !tic. s\-sti,m a n d optic.,~I io;iting l,t)c>rs of each optical device must have a high laser damage threshoid hie rn;itie ant] retlwtive coatings on a $TeO_{2}$ singlc crystal. which is used as an acoustooptic material, by E-beam evaporation method. Laser damage threshold \vas nicdsureci hy Ar laser with the input power oi 0.55LV 1,aser damage threiholti 01 $ZrO_{2}$ and $SiO_{2}$. filn-is were higher than $AI_{2}O_{3}$ f i l m U'e also investigated a long--tern1 stability of the output po\ver of St{(; green laser

개선된 모바일 P2P 네트워크 구현에 관한 연구

김용훈,박종민,조범준,Kim Yong-Hun,Park Jong-Min,Cho Beom-Joon 한국정보통신학회 2005 한국정보통신학회논문지 Vol.9 No.7

P2P(Peer-to-Peer)는 중앙서버 없이 개인간에 직접적인 연결을 통하여 디지털 자원(mp3, software, game, video 등)을 효과적으로 공유하는 방식으로 기존의 클라이언트/서버 방식과 달리 관련 프로그램만으로 디지털 자원에 대한 손쉬운 공유 및 교환이 가능하다. 본 논문에서는 이 제안기법을 이용한 P2P 응용 프로그램은 최초 실행할 때 하나 이상의 IP 주소를 입력받아야 하지만, 실행 이후에는 사용자로부터 어떠한 정보도 받지 않으면서 네트워크 그룹에 지속적으로 연결될 수 있다. 제안기법의 평가를 위해 시뮬레이션을 통해 연결되어진 피어들이 종료할 경우 네트워크 그룹에 재연결할 때까지 걸리는 시간을 측정하였다. A P2P is a method that can share and exchange on digital resources through a direct connection on personnel without a central server. In this paper, Although the P2P application that uses our proposed framework should obtain one or more IP addresses of the neighbor peers manually, after instantiate, the application can do its job while maintaining connection to the network continuously and automatically. To evaluate our proposed scheme, we measured and analyzed the time for a peer to reconnect to the network when the mediating peer fails and the network isolation occurs.

RF 스퍼터링방법에 의한 제2고조파소자의 광학박막 제작

김용훈,이성국,마동준,한재용,박성수,이상학,Kim, Yong-Hun,Lee, Seong-Guk,Ma, Dong-Jun,Han, Jae-Yong,Park, Seong-Su,Lee, Sang-Hak 한국재료학회 1996 한국재료학회지 Vol.6 No.6

공진기형 제 2고조파소자(SHG)는 레이저 빔의 에너지 밀도가 높아 고내구성 박막이 필요하다. 본 연구에서는 광학박막 재료로 고융점 산화물인 ZrO2, TiO2, SiO2를 사용하였다. 반응성 스퍼터링 방법으로 제작한 ZrO2, TiO2, SiO2 박막을 XRD, SAM을 사용하여 분석하였고, 박막의 광학적 특성을 평가하였다. SHG 소자의 KTP 및 Nd:YAG 결정의 반사방지막(A/R 코팅)구성은 ZrO2와 SiO2를 사용하여 컴퓨터로 계산하였는데 기본파인 1064nm와 제 2고조파인 532nm에서 각각 0.1%, 0.5%이하의 반사율을 갖도록 하였다. 또한 고반사막(H/R 코팅)의 경우 1064nm에서 99.9%의 반사율을 갖도록 TiO2와 SiO2로 디자인하였다. 제작한 광학박막의 광학적 특성, 레이저 내구성(laser damage threshold), 온습도 안정성 실험 등을 통해 광학박막을 평가하였다.

고관절에 적용한 PNF 안정화 기법과 교각운동이 요부안정화 근육에 미치는 영향

김용훈,정주현,Kim, Yong-Hun,Jung, Ju-Hyeon 대한고유수용성신경근촉진법학회 2017 PNF and Movement Vol.15 No.1

Purpose: The purpose of this study was to examine the effects of the PNF stabilization technique for the hip joint and the bridging exercise on the trunk stabilizer muscles in healthy adults. Methods: Twenty-eight healthy adults were randomly allocated to either a PNF stabilization exercise group (n = 12) or a bridging exercise group (n = 16). The outcome measures included the contraction thickness ratio in the transversus abdominis (TrA), internal oblique (IO), and external oblique (EO), and the TrA lateral slide was assessed during the abdominal drawing-in maneuver using b-mode ultrasound. The researcher measured the abdominal muscle thickness of each participant before the therapist began the intervention and at the moment that the intervention was applied. Between-group comparisons were performed using the Mann-Whitney U test. The level of statistical significance was set at 0.05. Results: The PNF intervention program showed a significant increase in the trunk stabilizer muscle. The percentage of change in the TrA thickness showed a significant interaction between intervention. However, there were no significant differences in the IO and EO between the two groups. Conclusion: The PNF stabilization technique for the hip joint can be used effectively to improve the IO and TrA muscles in healthy adults.

엄지발가락벌림을 강조한 PNF 다리패턴 시 엄지발가락벌림근을 활성화시킬 수 있는 가장 효과적인 방법은?

김용훈,박두진,Kim, Yong-Hun,Park, Du-Jin 대한고유수용성신경근촉진법학회 2020 PNF and Movement Vol.18 No.1

Purpose: This study aimed to determine the most effective way to facilitate the abductor hallucis muscle during PNF leg pattern-emphasized hallux abduction. Methods: The study recruited 18 healthy adults. All participants agreed voluntarily to take part in the study following an explanations of its purpose and procedures. They randomly performed the PNF leg pattern-emphasized hallux abduction variations in a hook-lying or sitting position. Activation of the abductor hallucis (AbH), adductor hallucis (AdH), extensor hallucis longus (EHL), and tibialis anterior (TA) muscles, and the ratio of AbH/AdH, were measured during PNF exercises using electromyography. One-way repeated ANOVA was used to compare the activation of foot intrinsic and extrinsic muscles during the four PNF exercises. Results: PNF leg pattern-emphasized hallux abduction using normal timing was significantly higher in TA compared to PNF leg pattern-emphasized hallux abduction using timing for emphasis, regardless of the starting position. The PNF leg pattern-emphasized hallux abduction using timing for emphasis in the hook-lying position was significantly higher in AbH than in other exercises. Although there was no statistically significant difference in the ratio of AbH/AdH, it was higher in the hook-lying position. Conclusion: PNF leg pattern-emphasized hallux abduction using timing for emphasis in the hook-lying position can be recommended as a method to optimize the activation of AbH and the ratio of AbH/AdH.

다운 증후군에서 재발성 슬개골 탈구 - 1례 보고 -

김용훈,김근우,민학진,윤의성,조응제,신호규 ( Yong Hoon Kim,Keun Woo Kim,Hak Jin Min,Ui Seoung Yoon,Woong Je Cho,Ho Kyu Shin ) 대한슬관절학회 1995 대한슬관절학회지 Vol.7 No.2

Recurrent dislocation of the patella is a relatively uncommon disease, which is most commonly seen in late adolescence. The condition is usually spontaneous and only rarely follows traumatic dislocation. But congenital anomalies such as cerebral palsy, myelodyspiasia, arthrogryposis, lateral femoral condyle aplasia, congenital dislocation of the hip, Down syndrome accompany this condition infrequently. The surgery is the treatment of choice for recurrent dislocation of the patella. But, no one type of operation can be useful for all recurrent dis]ocation of the patella, especially in childreo. A case of the recurrent dislocation of the patella observed in 13 year old boy with Down syndrome, in which the authors performed the semitendinosus tenodesis. Postoperative result was good on term of range of rnotion and no recurrence

무지 외반증에서 Mitchell 절골술과 중족골 근위 dome 절골술의 결과 비교

김용훈,김근우,민학진,윤의성,이장호,Kim, Yong-Hoon,Kim, Keun-Woo,Min, Hak-Jin,Yoon, Eui-Sung,Lee, Jang-Ho 대한족부족관절학회 2001 대한족부족관절학회지 Vol.5 No.2

Purpose: To evaluate the clinical results of Mitchell osteotomy and proximal metatarsal dome osteotomy in hallux valgus deformity. Materials and Methods: From January 1993 to June 2000, 28 cases (17 patients) with hallux valgus deformity who underwent Mitchell osteotomy were categorized as group I, 26 cases (16 patients) who underwent proximal metatarsal dome osteotomy were categorized as group II. We analyzed clinical results according to preoperative and postoperative clinical functional analysis and objective comparison of correction angle between two groups. Results: The average hallux valgus correction in the Mitchell osteotomy group went from $36^{\circ}$ to $11^{\circ}$, and in the proximal metatarsal dome osteotomy group, the hallux valgus angle was reduced from $32^{\circ}$ to $6^{\circ}$. The intermetatarsal angle in the Mitchell osteotomy group was corrected from $13^{\circ}$ to $9^{\circ}$, and in the proximal metatarsal dome osteotomy group the intermetatarsal angle was reduced from $14^{\circ}$ to $7^{\circ}$. Although, proximal metatarsal dome osteotomy group have shown better correction angle and radiographic results in the correction of hallux valgus angle and intermetatarsal angle but, all patients in the Mitchell osteotomy and proximal metatarsal dome osteotomy groups had no statistically significant differences of clinical functional results between two groups. Conclusion: In our studies, the proximal metatarsal dome osteotomy applied to. hallux valgus deformity was found as a good radiographic results than Mitchell osteotomy, but there were no differences between the two operations in terms of functional satisfaction.