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고강도 저합금강 용접금속의 미세조직과 기계적 특성에 미치는 니켈 함량의 영향
강용준,장지훈,박상민,이창희,Kang, Yong-Joon,Jang, Ji-Hun,Park, Sang-Min,Lee, Chang-Hee 대한용접접합학회 2012 대한용접·접합학회지 Vol.30 No.4
The microstructure and mechanical properties of the high-strength low-alloy steel weld metals with a variation of nickel content were investigated. The weld metals with a variation of nickel content from 2.3 to 3.3 wt% were prepared using Gas Metal Arc Welding process. The amount of acicular ferrite decreased with increasing nickel content; this is accompanied with an increase in the region of bainite and martensite, hence the hardness and tensile strengths were increased with the increase in nickel content, whereas the impact energy was deteriorated.
증 례 : 최소변화콩팥병증이 동반된 골수형성이상증후군 환자에서 스테로이드 치료
이상아 ( Sang Ah Lee ),임장환 ( Jang Hwan Lim ),장지훈 ( Ji Hun Jang ),장순희 ( Soon Hee Chang ),곽은경 ( Eun Kyoung Kwak ),이덕현 ( Duk Hyun Lee ),이선아 ( Sun Ah Lee ) 대한내과학회 2016 대한내과학회지 Vol.90 No.1
본 증례는 신증후군과 범혈구감소증이 있는 환자에서 골수형성이상증후군과 최소변화콩팥병증이 동시에 진단된 경우이다. 최소변화콩팥병증은 골수형성이상증후군에 동반된 방종양성 사구체신염으로 생각되며 면역억제제인 프레드니 솔론을 투여하면서 단백뇨의 호전 및 혈액, 골수 소견의 호전을 보인 것으로 보아 발병기전에서 면역체계의 이상이 중요하였음을 알 수 있다. 골수형성이상증후군 특히 모세포증가 불응빈혈-2에서 최소변화콩팥병증의 발생은 국내외에서 처음 보고하는 바이다. Glomerulonephritis associated with malignancy is deemed to be paraneoplastic glomerulonephritis. Myelodysplastic syndrome (MDS) is a group of heterogeneous clonal hematopoietic stem cell disorders characterized by impaired hematopoietic cell differentiation and cytopenia. The pathophysiology of MDS is thought to be immune-mediated in part. A few reports have documented various forms of glomerulonephritis in patients with MDS and suggested that immune dysregulation is important in the development of paraneoplastic glomerulonephritis. Here, we report a patient with MDS and refractory anemia with excess blast-2 accompanied by minimal change nephrotic syndrome. The patient was treated with prednisolone, and the nephrotic-range proteinuria and pancytopenia improved markedly. (Korean J Med 2016;90:63-67)
수술 전 등척성 및 등속성운동 근력의 측정을 통하여 회전근개 전층파열의 크기를 예측할 수 있는가?
김주오 ( Ju O Kim ),심상돈 ( Sang Don Shim ),정문수 ( Mun Su Jeong ),장지훈 ( Ji Hun Chang ),박철 ( Cheol Park ) 대한스포츠의학회 2009 대한스포츠의학회지 Vol.27 No.1
To evaluate association between the size of full-thickness rotator cuff tears (RCTs) and preoperative isometric and isokinetic strength (IMS and IKS) of the shoulder, we measured the preoperative range of motion, IMS and IKS of the shoulder of 60 cases preoperatively. All patients underwent arthroscopic surgery and the size of defects was measured. The patients were divided into two groups (Group I: below 3cm, Group II: above 3 cm). Strength was recorded as a ratio of comparing RCTs with that of the normal control group. An average IMS was 55%, 58% and 66% in forward elevation (FE), abduction and external rotation (ER) in group I(35 cases), and 46%, 40% and 49% in group II(25 cases). An average IKS (peak torque) was 58%, 60% and 66% in group I, and 49%, 56% and 60% in group II. There was no significant difference in strength tests between two groups (p>0.05).