액체 금속 구동용 선형유도전자펌프의 자속밀도 분포 해석

장남영(Nam Young Jang),은재정(Jae Jung Eun),박태봉(Tae Bong Park),최훈기(Hun Gi Choi),유근종(Geun Jong Yoo) 대한전기학회 2003 대한전기학회 학술대회 논문집 Vol.2003 No.7

제1 중족골 근위 반월형 절골술과 Ludloff 절골술 후 교정 각도에 따른 절골편간 접촉 면적 비교(예비보고)

박용욱,장근종,박상호,Park, Yong-Wook,Jang, Keun-Jong,Park, Sang-Ho 대한족부족관절학회 2010 대한족부족관절학회지 Vol.14 No.1

Purpose: This study was performed to compare the contact area between three different correcting angles after the proximal crescentic and Ludloff osteotomies of the first metatarsal. Materials and Methods: We used the two sawbone models. Proximal crescentic (PCO) and Ludloff osteotomies (LO) were performed and secured using K-wires under the correcting intermetatarsal angle (IMA) $5^{\circ}$, $10^{\circ}$, and $15^{\circ}$. Then each 6 osteotomized model was scanned five times and measured the contact area using the calculating program. We excluded the highest and lowest values. Results: The mean area of cutting surface was 189 $mm^2$ in PCO, 863 $mm^2$ in LO. The mean contact area (contact ratio; contact area $\times$100/area of cutting surface) of PCO was 149 $mm^2$ (79%) in $5^{\circ}$, 139.5 $mm^2$ (74%) in $10^{\circ}$, 107 $mm^2$ (57%) in $15^{\circ}$ IMA. The mean contact area (contact ratio) of LO was 711 $mm^2$ (82%) in $5^{\circ}$, 535.5 $mm^2$ (62%) in $10^{\circ}$, 330 $mm^2$ (38%) in $15^{\circ}$ IMA. Conclusion: A significant decrease in the contact area and contact ratio according to increase in correcting IMA was noticed in LO. We recommend the PCO rather than LO, when the IMA is needed to correct over $15^{\circ}$.

선형유도전자펌프내의 자기유체 유동에 관한 수치적 연구

최훈기,유근종,박태봉,은재정,장남영 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

Numerical analysis is performed for magnetic and MHD flow fields in Electro-Magnetic(EM) pump. A finite volume method is applied to solve magnetic field governing equations and the Navier-Stokes equations. Vector and scalar potential methods are adopted to obtain the electric and magnetic fields and the resulting Lorentz force in solving Maxwell equations. The magnetic field and velocity distributions are found to be influenced by the magnitude of the Reynolds number and the phase of applied electric current. Computational results indicate that the magnetic flux distribution with changing phase of electric current is characterized by a pair of counter-rotating closed loops. The velocity distribution of the flow field is influenced on the intensity of Lorentz force.

만성 석회화 건염에 대한 다발성 천공술 후 추가적으로 시행한 체외 충격파 치료의 에너지 수준에 따른 결과분석

노규철,장근종,Noh, Gyu Cheol,Jang, Keun Jong 대한정형외과초음파학회 2012 대한정형외과 초음파학회지 Vol.5 No.2

목적: 만성 석회화 건염에 대한 보존적 치료방법으로 석회질 다발성 천공술과 체외 충격파 병합 치료의 효과를 비교하고, 체외 충격파 치료의 에너지 수준에 따른 임상적, 방사선학적 효과에 대하여 알아보고자 하였다. 대상 및 방법: 환자 선정은 2010년 6월부터 2011년 8월까지 어깨 통증으로 내원 후 극상근 만성 석회화 건염으로 진단받은 환자 98명을 대상으로 하였으며, 천공술 후 체외 충격파 치료를 에너지 수준에 따라 고에너지군(제 1군;31명), 저에너지군(제 2군;36명) 및 다발성 천공술 시행군(제 3군;31명) 으로 분류하였다. 보존적 치료에 반응하지 않고, 견관절 통증이 6개월 이상 지속되는 만성 석회화 건염 환자들만을 대상으로 하였다. 임상적 평가는 시술 전과 후 12주째 임상적 기능향상 및 증상 호전 정도를 ASES, KSS, CSS와 방사선학적 호전 정도를 석회화 결절의 크기 변화로 평가하였다. 결과: 세 군 모두에서 임상적 기능의 개선과 석회화의 감소가 나타났으며, 특히 임상적인 개선이 다발성 천공술만을 시행한 군(3 군)보다 추가적인 ESWT를 시행한 군(1, 2군)에서 매우 높게 나타났다. 또 방사선학적으로 볼 때, 석회화의 크기와 진행 속도는 통계적으로 유의하게 줄어들었다. 군간의 비교를 보면, 임상기능 개선의 정도와 석회화의 속도 감소의 차이는 고에너지 군(1군), 다발성 천공술(3군) 사이가 저에너지 군(2군), 다발성 천공술(3군)에서 보다 더 크게 나타났다, 그러나, 고에너지 군(1군)과 저에너지 군(2군)에서는 큰 차이가 없었다. 결론: 만성 석회화 건염의 치료를 위해, 추가적인 체외 충격파 치료는 다발성 천공술 단일로 시행했을 때보다 에너지 수준에 관계없이 임상적 기능의 개선과 석회화의 감소에 더 우수한 효과를 보여주었다. 그러나, 에너지 수준에 의한 체외 충격파 치료의 결과로, 석회화의 감소와 임상 기능 개선 정도에 대한 큰 차이가 없었다. Purpose: To compare the outcome of two methods of chronic calcific tendinitis (CCT) treatment, Multiple drilling alone versus combined drilling and extracorporeal shock-wave therapy (ESWT). Furthermore, to analyze the clinical and radiologic results of different energy level configurations of ESWT. Materials and Methods: Among the patients complaining shoulder pain who visited the clinic from June 2010 to August 2011, 98 were diagnosed with CCT of the supraspinatus and were divided into the following three groups. Multiple drilling alone (n=31), Multiple drilling followed by high-energy ESWT (n=31), Multiple drilling followed by low-energy ESWT (n=36). The study was conducted only with patients with chronic pain persisting longer than six months despite prolonged conservative therapy. Clinical evaluation was done before and after 12 weeks from treatment, in clinical terms using the ASES, KSS, CSS system reflecting performance and symptom improvement, and in radiologic terms by studying the change in size of the calcific nodules. Results: All of three groups showed effects for improvement of clinical function and decrease of calcification and clinical improvement was significantly high in comparison between the group fulfilled by only multiple needling (the third group) and the group fulfilled by additional ESWT (the first and second groups) and in the radiological evaluation, calcification size and the rate of calcification decrease showed significant improvement statistically. For the comparison among the groups, degree of clinical function improvement and rate of calcification decrease showed significant difference between high energy group (the first group) and multiple needling group (the third group) as well as low energy group (the second group) and multiple needling group (the third group). But, in comparison between high energy group (the first group) and low energy group (the second group), there was no significant difference for the degree of clinical function improvement and rate of calcification decrease. Conclusion: For the treatment of chronic calcific tendinitis, additional ESWT showed more superior effects on clinical function improvement and radiological improvement regardless of the energy standard rather than the exclusive fulfillment of needling. But, as the result of ESWT by the energy standard, there was no significant difference for the decrease of calcification and degree of clinical function improvement.

소아에서 발생한 근하 골막 주위 심부 혈관 점액 지방종

김홍균,유정한,박용욱,박진수,노규철,정국진,장근종,황지효,Kim, Hong-Kyun,Yoo, Jeong-Han,Park, Yong-Wook,Park, Jin-Soo,Rowe, Kyu-Cheol,Chung, Kuk-Jin,Chang, Keun-Jong,Hwang, Ji-Hyo 대한근골격종양학회 2010 대한골관절종양학회지 Vol.16 No.1

혈관 점액 지방종은 지방종의 한 변이형으로, 1996년 Mai 등이 처음 보고한 이래 현재까지 9 예에서 보고될 정도로 드문 병변이다. 병리학적 소견으로 세포수가 적은 점액질 다수와 울혈된 얇고 많은 혈관이 포함되어 있는 지방 세포로 구성이 되어있다. 지금까지의 보고된 모든 경우, 성인에 있어서 두피나 조갑 하, 체간의 표재성 병변이었다. 이에 저자들은 소아에 있어서 슬관절 주위 근처에서 근육 하 골막 주위의 혈관 점액 지방종 1예를 경험하고 드문 증례로 생각하여 문헌 고찰과 함께 보고한다. Angiomyxolipoma is a rare variant of lipoma, which is described by Mai, 1996, at first. The nine cases of which have been reported to date. Microscopically, the lesion consists of adipose tissue with the paucicellular myxoid areas and fat tissue with numerous thin, dilated, and congestive blood vessels. The reported cases mostly located to the superficial layer on the scalp, subungual, extremities in adults. We report one case of angiomyxolipoma located in the submuscular and parosteal area in the distal femur around knee joint in a child.

지실의 멜라닌 생성 억제 물질

손애랑,최지영,김정아,조세훈,허광화,박성희,정시련,정태천,장영동,손근종,이승호 한국생약학회 2005 생약학회지 Vol.36 No.1

develop an whitening cosmetics, we isolated the melanogenesis inhibitors from the unripe fruits of Poncirus tri-foliata (Rutaceae). Isolated compounds were identified as poncirin(1), naringin(2), bis(2-methylheptyl)phthalate(3), avenalumicacid methyl ester(4) by comparison of physical and spectral data with those reported in the literature. Among the isolated com-pounds, bis(2-methylheptyl)phthalate showed most potent inhibitory effect on the melanogenesis in cultured B-16 mouse mel-anoma cell lines(IC50, 36.8M) compared with kojic acid(IC50, 150M).Key wordsPoncirus trifoliata, Rutaceae, bis(2-methylheptyl)phthalate, whitening cosmetics, melanogenesis inhibitors

청소년에서 발생한 양측 경골 조면 골절의 수술적 치료

김홍균 ( Hong Kyun Kim ),유정한 ( Jung Han Yoo ),박용욱 ( Yong Wook Park ),박진수 ( Jin Soo Park ),노규철 ( Kyu Cheol Noh ),정국진 ( Kook Jin Chung ),장근종 ( Keun Jong Jang ),황지효 ( Ji Hyo Hwang ) 대한골절학회 2010 대한골절학회지 Vol.23 No.3

Bilateral avulsion fractures of the tibial tubercles are extremely rare. There is no case report about this in Korean literature. We present simultaneous bilateral tibial tuberosity fractures in 14-year-old adolescent male fell on the ground during running. These fractures were managed by open reduction and screw fixation. We gained complete union and removed metal after 6 months. Functional results were excellent 6 month after surgical treatment.