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기계적 합금화에 의해 제조된 비정질 Ni-Ti 합금의 단거리 규칙성
김배균,이덕열 고려대학교 공학기술연구소 1990 고려대학교 생산기술연구소 생기연논문집 Vol.26 No.1
Amorphous Ni_(35)Ti_(65), Ni_(40)Ti_(60), Ni_(50)Ti_(50) and Ni_(60)Ti_(40) alloy powders were produced by mechanical alloying of elemental powders. Structural analysis was carried out for the mechanical alloy powders based on the X-ray diffraction experiments made using Ag Kαradiation (λ= 0.56 Å). The short-range atomic distribution in the mechanically alloyed Ni_(35)Ti_(65) and Ni_(40)Ti_(40) was found to be similar to that in the amorphous alloys of the same composition prepared by liquid quenching. The total interference functions of the Ni_(50)Ti_(50) and Ni_(60)Ti_(40) mechanical alloys have the prepeak at K∼1.9Å^(-1) like the other two alloys but, when compared with those synthesized from the partial functions of the amorphous Ni_(40)Ti_(60) alloy, they are similar in shape but somewhat out of phase.
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정양국,김배균,Chung, Yang-Guk,Kim, Bae-Gyun 대한정형외과초음파학회 2008 대한정형외과 초음파학회지 Vol.1 No.1
주관절, 완관절 주변의 압박성 신경병증은 일상생활의 불편을 초래하는 상지에서의 흔한 신경병증의 하나로 이에 대한 초음파 검사 소견을 바르게 해석하는 데는 정상적인 신경의 구조와 압박성 신경병증의 병리적 변화를 이해하는 것이 중요하다. 압박성 신경병증에서는 특징적인 초음파 소견을 보이는데 압박부위의 신경은 눌려서 편평한 모양으로 나타나고 근위부에서는 고신호강도의 부종성 변화와 신경속 양상의 소실을 보인다. 기본적인 횡주사 및 종주사 영상 외에 관절이나 근육을 동적으로 움직이면서 시행한 초음파 검사는 척골신경이 주관절 굴곡시 삼두박건 내측두와 함께 내상과위로 아탈구 되는 탄발성 삼두박근 증후군이나 능동적 회내근의 수축시 신경압박이 일어나는 원형 회내근 증후군 등에서 신경의 아탈구나 압박소견을 보여준다. 수근관 증후군이나 주관 증후군 등에서는 신경 단면적의 정량적인 계측이나 압박비의 평가가 진단에 도움이 된다. 임상적 검사 및 전기생리적 검사와 병행하여 사용할 경우 초음파 영상은 상지에서의 압박성 신경병증을 진단하는데 있어 매우 유용한 검사방법의 하나이다. Compression neuropathy around elbow and wrist are one of the common disturbing problems in the upper extremity. The understanding of normal nerve architectures and pathophysiologic changes in compression neuropathy is important to interpret the ultrasonographic images correctly. Compression neuropathies have characteristic ultrasonographic imaging features of flattened nerve at compression and hypoechoic swollen nerve with loss of fascicular patterns at proximal segments. Dynamic ultrasonographic imagings on motion can show dymanic subluxation of ulnar nerve and medial head of triceps muscle over the medial epicondyle in snapping triceps syndrome. Dynamic compression of median nerve also can be visualized in pronator teres syndrome by dynamic imaging studies. A quantitative measures of cross sectional area or compression ratio can be helpful to diagnose compression neuropathies, such as carpal tunnel syndrome or cubital tunnel syndrome. With the clinical features and electeophysiologic studies, the untrasonographic imagings are useful tool for evaluation of the compression neuropathies in the upper extremities.
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김동휘,김배균,김정만,Kim, Dong-Hui,Kim, Bae-Gyun,Kim, Jung-Man 대한관절경학회 2004 대한관절경학회지 Vol.8 No.1
슬관절에서 외측 원판형 연골판은 흔히 발견되고 있으나, 내측 원판형 연골판의 빈도 및 보고가 드물다. 본 증례에서는 수평 파열과 더불어 상순에 국한된 변연부 파열이 관찰되었으며 이는 정상의 반월상 연골뿐만 아니라 원판형 외측 반월상 연골에서도 보기 드문 형태이다. 다른 정상 연골판이나 원판형 외측 반월상 연골 파열의 형태와 비교하여 본 증례의 파열 기전을 논하였다. Although the lateral discoid meniscus of the knee has been observed frequently, the discoid medial meniscus has rarely been reported in the literature. A discoid medial meniscus with the horizontal tear and the peripheral tear of upper lip were observed. This tear pattern is not usual in the lateral discoid meniscus as well as in the normal meniscus. A plausible mechanism of the tear pattern compared with the normal shape and the discoid lateral meniscus was discussed in the following.
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이창윤,김택겸,홍상수,김배균 대한금속·재료학회 2009 METALS AND MATERIALS International Vol.15 No.5
A method for fabricating an Ag coated beam splitter is reported. This shows a specific patterned transmittance by immersing glass substrates in a mixture of H2SO4 and H2O2 to make negatively charged oxygen sites at the silica surface and then in ethanolic solutions of AgNO3 and butylamine. We controlled the soaking time and molar ratios of the mixture of AgNO3 and butylamine to a pattern % transmittance of electroless coated glass surface. Finally, we made a functionalized beam splitter showing step function like transmittance and applied this to make multiple laser beams for display and laser machinings. A method for fabricating an Ag coated beam splitter is reported. This shows a specific patterned transmittance by immersing glass substrates in a mixture of H2SO4 and H2O2 to make negatively charged oxygen sites at the silica surface and then in ethanolic solutions of AgNO3 and butylamine. We controlled the soaking time and molar ratios of the mixture of AgNO3 and butylamine to a pattern % transmittance of electroless coated glass surface. Finally, we made a functionalized beam splitter showing step function like transmittance and applied this to make multiple laser beams for display and laser machinings.
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대퇴골두 무혈성 괴사에 대한 혈관부착 비골 이식술 후 디지털 감산 혈관조영술 소견
이기행,김윤수,이해규,옥지훈,김배균,김형민,Lee, Kee-Haeng,Kim, Youn-Soo,Lee, Hae-Giu,Ok, Ji-Hoon,Kim, Bae-Kyun,Kim, Hyoung-Min 대한미세수술학회 2004 Archives of reconstructive microsurgery Vol.13 No.2
Purpose : To observe the patency of anastomosis site and the findings of circulation of grafted fibula in osteonecrosis of femoral head treated with vascularized fibular graft by use of digital subtraction angiography. Materials and Methods : 17 cases of 11 patients who underwent vascularized fibula graft for osteonecrosis of femoral head. We performed digital subtraction angiography(DSA) for them at second week postoperatively in 12 cases, at sixth week in 1 case, at sixth month in 2 cases, at twelfth month in 1 case, and eighteenth month in 1 case which had been got DSA at second week before. We observe the patency of pedicle, and the circulation of grafted fibula such as periosteal and intraosseous vessels with time. Results : All cases except one which were thought failure of selective angiogram showed good passage of blood flow through anstomosed pedicle on DSA. We found the differences in appearance of circulation of grafted fibula with time. DSA at 2nd and 6th week postoperatively revealed both of periosteal and intraosseous vessels along the fibula and blood pooling at the tip of fibula. DSA at 6th month showed maintenance of periosteal and intraosseous vessels along the fibula but did not clearly reveal blood pooling at the tip of fibula. The findings of DSA at 12th and 18th month were similar each other. The periosteal vessels were not seen as the grafted fibular bone were incorporated into surrounding femoral bone but intraosseous vessels were still seen. Conclusion : It was thought that DSA could be used for evaluation of the status of pedicle including anastomsed site and vessels of grafted fibula with time. The periosteal vessels of fibula were decreased with time but intraosseous vessels were still seen until 18th month after vascularized fibula graft.
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최남용,정형국,고해석,한석구,나기호,송현석,김배균,Choi, Nam-Yong,Cheong, Hyung-Kook,Koh, Hae-Seok,Han, Suk-Ku,Nah, Ki-Ho,Song, Hyun-Seok,Kim, Bae-Gyun 대한관절경학회 2005 대한관절경학회지 Vol.9 No.2
목적: 소아에서 발생한 전위된 경골극 골절에 대해 관절경을 이용하여 정복 및 고정을 시행 후 임상적 결과를 분석하고 그 유용성을 문헌 고찰과 함께 보고하고자 하였다. 대상 및 방법: 2000년 12월부터 2004년 7월까지 경골극 골절로 내원한 소아 환자중 골편이 전위되어 수술적 가료가 요하였던 5예를 대상으로 하였다. 남자가 3예, 여자가 2예였으며, 평균연령은 9.1세(8.3세${\sim}$11세)였다. Movers & McKeever 분류상 5예 모두 III형이었고, 수상 후 수술일까지의 기간은 평균 4.8일($3{\sim}8$일)이었다. 수술 방법은 3예에서 관절경하 정복 및 견인 봉합술을, 나머지 2예는 관절경하 정복 및 나사못을 이용하여 고정술을 시행하였다. 평균 추시기간은 38.2개월(13개월${\sim}$56개월)이었다. 술후에는 2주간 장하지 석고 고정후 단계적 관절운동을 허용하였으며 술후 6주에 완전 체중 부하를 허용하였다. 수술 후 임상적 평가는 관절 운동 범위, Lachman 및 Pivot shift 검사 KT-1000 관절계를 이용하여 전방전위 정도를 측정하였고, 슬관절 기능평가는 Lysholm 슬관절 점수와 modified Feagin 점수를 측정하였다. 결과: 술 후 5예 모두에서 골유합을 얻었고, 최종 추시시 슬부 전방 동통이나 자각증상은 없었으며, 정상 슬관절 운동범위로 회복되었다. Lachman 검사상 1예에서 경도의 양성 소견을 보였으나 나머지 4예에서는 정상 소견을 보였다. KT-1000 관절계를 이용한 전방 전위 검사에서는 술 후 평균 1.9 mm였고, Lysholm 점수는 술 후 평균 99.4점, modified Feagin 점수는 모든 예에서 양호 이상이었다. 결론: 소아에서 발생한 전위된 경골극 골절시 관절경을 이용한 정복 및 고정으로 특별한 합병증 없이 만족할 만한 결과를 얻을 수 있었다. 견인 봉합이나 나사못을 이용한 고정술은 골편 고정에 모두 유용한 치료방법으로 사료된다. Purpose: To analyze the clinical result of the arthroscopic reduction and fixation for the displaced tibial spine fractures in children and report the utility of the arthroscopic treatment with the review of the literature. Methods: Between December 2000 and July 2004, five patients (average age 9.1 years) received an arthroscopic reduction and fixation of displaced tibial spine fracture. A male-to-female ratio was 3:2 and mean follow-up was 38.2$(13{\sim}56)$ months. All five patients were classified type III by Movers and McKeever classification. The average period from injury to operation was 4.8 days $(3{\sim}8days)$, the avulsed fragment was reduced by operative arthroscopy and fixated by pull-out suture in 3 patients and by cannulated screw in 2 patients. Postoperatively long leg cast was applied for 2 weeks, and then gradual range-of-motion exercise was permitted. Full weight-bearing ambulation was permitted after 6 weeks. The clinical evaluation was performed by range of motion, Lachman and pivot shift test, KT-1000 arthrometer, Lysholm knee score and the modified Feagin score. Results: All five patients had no symptom and recovered full range of motion of the affected knees. Lachman test was positive finding of 1+ laxity in one patient, the others were negative, and all patients were negative findings for pivot shift test. The result of KT-1000 arthrometric assessment is mean maximum side-to-side differences 1.9 mm. Average Lysholm knee score was 99.4. All patients had excellent results in modified Feagin score. Conclusion: Arthroscopic reduction and fixation of displaced tibial spine fracture in children showed excellent result without complication. Both pull-out suture fixation and cannulated fixation provide an effective treatment option for fixation of the displaced anterior tibial spine fracture.
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