진행성 골화성 섬유 이형성증의 1예

임태영,조영신,정춘해,박유환,하상호,유재원 조선대학교 부설 의학연구소 2002 The Medical Journal of Chosun University Vol.27 No.1

진행성 골화성 섬유 이형성증은 2 백만명 중에 1명 발생하는 매우 드문 유전질환이다. 저자들은 2차례의 외상후 심해진 진행성 섬유 이형성증환자에서 최근 다시 발생된 외상후 생긴 병변부위에 biphosphonate와 steroid 투여로 최근수상부위의 근육 골화와 경화를 현저한 호전을 보였으나, 기존의 골화가 이미 진행된 병변에서는 잘 반응하지 않음을 경험하였기에 문헌고찰과 함께 보고하는 바이다. Fibrodysplasia ossificans progressiva(FOP) is an extremely rare hereditary disorder characterised by progressive heterotopic ossification of the soft tissue. The resulting progressive immobilization of the limbs, jaw and chest wall generally leads to severe disability. We present an 20-rear-old man with advanced FOP. He had two operative interventions by prior traffic accident and recent biopsy. It resulted abnormal ossification. Treatment for this disorder is avoidance of exacerbating factors and medical strategies is biphosphonate and steroid. We observed the course of ossification and muscle atrophy during biphosphonate and steroid therapy in advanced FOP.

철계 소결체의 피삭성에 관한 연구

임태환 선문대학교 1999 공과대학논문집 Vol.1 No.2

철계 소결체에 피삭성을 향상시키는 다양한 원소들을 Fe+0.7%C 소결체에 첨가하여 실험한 결과, 0.15%SiO_(2)+0.15%MgO을 Fe+0.7%C 소결체에 첨가하여 소결 한 후 증기처리 한 소결체가 가장 우수한 피삭성을 나타내었다. Various elements which can improve the machinability of sintered ferrous materials were added into the sintered Fe+0.7%C. From the results of the machinability test, it was found that the sintered part containing 0.15%SiO_(2)+0.15%MgO, which was sintered followed by a steam treatment, exhibited the superior machinability.

Fe-χ%C-χ%Mn 강 제품의 파단 현상 개선에 관한 연구

임태환 선문대학교 ·중소기업기술지원연구소 1996 선문공대 연구/기술 논문집 Vol.1 No.1

와샤의 비틀림 가공시 재료가 파단되는 원인은 제품의 결정립이 조대화되었기 때문이라고 판정하였다. 따라서, 이와 같은 현상을 해결하기 위하여 소둔은도를 χ ℃로 약간 올려, 완전히 γ(austenite)구역으로 들어가게 하고, 소둔시간은 36분으로 단축하여 열처리하므로써, 불량품 생산량을 줄이고, 제품을 대량생산 할 수 있게 하였다. The reason of fracture during the forming of washers was thought o be due to the grain growth of the microstructure. To solve this problem, annealing temperature was slighty increased to χ ℃ so that a washer was fully austenized but annealing time was reduced to 36 minutes. By the treatment, it was enable to reduce the number of inferior goods and the mass production of the washers was possible.

액체크로마토그래피/질량분석법을 이용한 랫트 혈장내의 Surfactin C의 정량법에 관한 연구

임종환,김명석,이동연,이상훈,백경진,김태원,정두순,박병권,윤효인 충남대학교 수의과대학 동물의과학연구소 2004 動物醫科學硏究誌 Vol.12 No.-

Surfactin isolated from Bacillus subtilis has a strong surface tension-lowering activity, together with antiviral, antitumor, fibrinolytic and hypocholesterolemic activities. LC/MS is a simple, rapid and effective technique for the determination of surfactin C in rat serum. The separation of surfactin was achieved on reverse phase column. The mobile phase consisted of 0.1% trifluoracetic acid in water (A) and acetonitrile (B). As a result of analysis of blank rat serum samples, matrix interference was not shown. The values of precision and accuracy were satisfied w the guideline. A newly developed LC/MS method for the determination of surfactin C was successfully applied in its pharmacokinetic analysis.

AMESim를 이용한 유압 굴삭기용 Main Control Valve의 해석에 관한 연구

임태형,최종환,양순용,이병룡,안경관 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

The hydraulic excavator has been a popular research object for automation because of its multi-workings and economic efficiency. When it works crane tasks, most of disasters happen. The objective of this paper is to design each components and to construct boom, arm, bucket circuit. These models modeled with AMESim show us change of variables and behavior of excavator. Simulation model will be used for simulator of excavator.

분말야금법에 의해 제조된 소결 GEAR 및 RATCHET의 조직 특성

임태환,이창순,박인규 선문대학교 중소기업기술지원연구소 1997 선문공대 연구/기술 논문집 Vol.2 No.1

맥반석 분말의 특성에 관한 연구

임태환 선문대학교 1998 공과대학논문집 Vol.1 No.1

맥반석 분말의 특성을 분석하여 다음과 같은 결과를 얻었다. (1) 맥반석 분말입자의 형상은 구형에 가깝고 작은 입자가 뭉쳐 하나의 입자를 형성하고 있었다. (2) 맥반석 분말에 대하여 입자 크기 및 입도 분 포 분석을 실시한 결과 평균 입자 크기는 1.98㎛으로 나타났고 분말의 입도 분포는 편차 없이 균일하였다. (3) 분말의 구성 원소 분석을 실시한 결과, O, Si, Fe, Ca, K의 량은 각각 58.75%, 20.65%, 12.22%, 5.41%, 2.97%로 나타났다. 각 구성 원소의 량으로부터 구성 산화물을 정성적으로 예측해 보면 주성분으로 Si산화물(SiO_(2))이 약 70%정도 존재하고, 그 외의 성분으로는 Fe산화물(Fe_(2)O_(3)), Ca산화물(CaCO_(3), CaO), K산화물(K_(2)O)로 구성되어 있다고 말할 수 있다. (4) 분말의 pH값은 11.79로 나타나 중성을 강한 알칼리성으로 변화 시키는 것을 알 수 있었다. (5) 원적외선은 가열온도 270℃이상에서 90%이상의 방출율을 나타내었다. (6) 흡착시험의 결과, 650℃에서 1hr 탄화를 거친 후의 맥반석 분말의 비표면적은 3~9㎡/g로 측정되었고, KOH로 150 및 300wt%로 침적시켜(850℃에서 2시간 소결) 활성화 시켰을 때 흡착값은 50~75㎡/g를 나타내어 흡착율은 매우 우수한 것을 알 수 있었다. (7) 맥반석 분말에 대하여 진탕 배양법에 의한 항균능력을 시험한 결과, 대장균 및 포도상구균에 대하여 맥반석 분말을 5%의 농도로 첨가하였을 경우에 세균의 감소율은 99.9%이상을 나타내어, 탁월한 항균 효과를 나타내었다. The results of analysis of the characteristics of Mack ban suck powder are as follow, (1) Mack ban suck powder particles were almost spherically shaped in appearance, and one can see that small particles lumped together to from larger particles. (2) Analysis of the size distribution of Mack ban suck powder particles confirmed that the average size was 1.98㎛ and they were uniform in size without deviation. (3) Analysis of constitution of Mack ban suck powder revealed that the quantity of oxygen(O), silicon(Si), iron(Fe), calcium(Ca) and potassium(K) were respectively 58.75%, 20.65%, 12.22%, 5.41% and 2.97%. Qualitative estimation of containing oxidized compounds from the amount of each element showed that the main oxidized compound was silicon dioxide(SiO_(2)), constituting approximately 70% of total oxides and there also were iron oxides(Fe_(2)O_(3)), calcium oxides(CaCO_(3), CaO) and potassium oxides(K_(2)O). (4) The pH of the powder was 11.79, showing that it was changed from neutral to strong alkaline in nature. (5) Distant infrared rays showed an emission percentage of more than 90% under heating temperature above 270℃. (6) Adsorption tests showed that the surface of Mack ban suck powder after carbonation for 1 hour in 650℃ was 3~9㎡/g and the adsorption value after activation by 150 and 300wt% using KOH(850℃, 2 hour) was 50~-75㎡/g, thus evidencing its superior adsorption percentage. (7) Mack ban suck powder was tested for its antibacterial activity by shake culturing. And it was found that more then 99.9% of escherichia coli and staphylococcus aureus bacteria were decreased when Mack ban suck powder was added to a concentration of 5%.

소결 고속도 공구강의 내마모 특성

임태환,이수완 선문대학교 중소기업기술지원연구소 1997 선문공대 연구/기술 논문집 Vol.2 No.1

Rolling die 크기를 변화시켜 제작한 소결체 및 합금 조성을 변화시켜 제작한 고속도 공구강 소결체에 대하여 마모 실험, 고온경도 실험 등을 실시한 결과, 소결체의 마모는 abrasive wear로 일어나며 재료의 경도값이 마모율을 결정하는 주 인자가 된다고 생각한다.

단백뇨를 보이는 사구체 질환 및 당뇨병성 신병증에서의 Lp(a)

권태환,김준홍,조성,김석재,김용림,조동규,백미영 경북대학교 병원 1998 경북대학교병원의학연구소논문집 Vol.2 No.1

Background: Recently there has been evidences that serum Lp(a), an independent risk factor to atherosclerotic cardiovascular diseases, were increased in proteinuric disorders such as nephrotic syndrome and diabetic nephropathy. Methods: We intended to search of altered concentrations of Lp(a) in proteinuric disorder measuring serum Lp(a) concentrations with ELISA in 44 glomerulonephritic patients(25 nephrotic syndrome(NS), 19 non-nephrotic range proteinuric glomerulonephritis(GN), 25 diabetic nephropathy patients(DN), and 31 healthy controls(HC). Also, we compared Lp(a) concentration between glomerulonephritis patients and diabetic nephropathy patients with proteinuria of similar degree. Results: 1) There were significantly increased levels of total choesterol, triglyceride, and LDL-cholesterol in Ns compared to GN, DN, HC. 2) There were significantly increased concentrations of serum Lp(a) in NS compared to HC, but no signiicant difference in serum Lp(a) among NS, GN, and DN. 3) There was no significant difference in serum Lp(a) concentrations between NS & DN with 24 hour urine protein greater than 3.0g. 4) There was no significant difference in serum Lp(a) concentration between GN with 24 hour urine protein greater than 0.5g and less than 1.5g and DN with proteinuria of simial degree. 5) In glomerulonephritis patients, there was negative correlation between serum Lp(a) concentration and serum albumin level but correlation with 24 hour urinary protein, total cholesterol, Ldl-cholesterol, and HDL-cholesterol was not shown. In diabetic nephropathy, there was no significant correlation among serum Lp(a) concentration and all parameters including serum albumin, 24 hour urinary protein, and other lipid profiles. Conclusion: The present study confirmed that patients with nephrotic syndrome of diverse etiologies have makedly increased plasma level of Lp(a), in conjunction with other lipid abnormalities. However, this study shows no difference in Lp(a) concentrations between diabetic nephropathy and glomerulonephritis with similar degree of proteinuria.

ZMP를 이용한 굴삭기의 안정성에 관한 연구

최종환,엄혁,임태형,김승수,양순용,이병룡,안경관 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

The hydraulic excavator has been a popular research object for automation because of its multi-workings and economic efficiency. When it works crane tasks, most of disasters happen. The stability of the excavator having crane function has a close relation with excavator's posture, motion and load. In this paper, the stability of tipping-over has been analysed using Zero Moment Point(ZMP),