Al-Si合金의 閃光法에 의한 熱擴散係數測定에 關한 硏究

許甫寧,裵源泰,徐弘三,李寬洙,朴種一 慶尙大學校 1984 論文集 Vol.23 No.2

本 硏究를 通하여 얻은 結果는 다음과 같다. 1. Al-Si 合金에서 Si量이 增加할수록 熱擴散係數는 감소하나, 共晶組成(Al-12%Si) 部近에서는 亞共晶, 過共晶組成에 비하여 약간 增加하였다. 비열과 비중등의 조건이 一定하다면 熱擴散係數는 pure Al 이 8.47, 亞共晶(6%)組成이 3.24, 共晶組成(12%)이 3.99, 過共晶組成(18%Si)이 3.01(×10-5m2/sec)이다. 2. Cu, P, Na로 개량처리 하였을 때 共晶組成이내에서는 Cu의 경우에 열확산계수가 가장 적었으나, 과공정조성에서는 Cu의 경우가 가장 높았다. After pure Al, Al-6% Si(hypoeutectic composition), Al-12% Si(eutectic comp.) and Al-18% Si(hypereutectic comp.) among Al-Si alloys were treated refinement with addition of Cu(0.5%), P(0.5%) or Na(0.5%), their thermal diffusivities were measured by flash method. And then their microstructures and thermal diffusivities were investigated. The results obtained are as follows. 1. According as sillicon contents in Al-Si alloys increase, the thermal diffusivities decreases, but it increases slightly at eutectic composition(Al-12% Si alloy), if its density and heat capacity are constant, the thermal diffusivities are 8.47(pure Al), 3.24(6% Si), 3.99(12% Si) and 3.01(18% Si) (X10-5m/sec) respectively. 2. When the refinement treated with Cu, P, and Na, the effects of thermal diffusivities of alloys with Cu treated is the lowest under eutectic composition, but its effects is the best at hypereutectc composition.

식품생물 산업기술의 새로운 미래를 선도하는 나노기술

김종태,김철진,조용진,전보연 한국산업식품공학회 2004 산업 식품공학 Vol.8 No.1

Nanotechnology represents a new frontier in science and technology with long term goal and benefits. Nowdays, nanotechnology is producing many revolutions and applications such as quantum computing, surface and materials modification, novel swparation and sensing technologies, and human biomedical replacements. These new techniques are being introduced in food and cio filed. In this review, the status and trends related to nanocomposites, nanoparticles, nanoyubes, delivery vehicles and biosafely were reviwed. The situation of funding of nanotechnology research in USA, Japan and Korea is also summarized.

여의도 성모병원 신경정신과 입원환자에 대한 통계학적 고찰

김종은,최수호,최보문,김용찬,이규환 최신의학사 1984 最新醫學 Vol.27 No.1

K이 흡착된 Si(111)7×7표면에 대한 RHEED 연구

박종윤,이순보,이경원,안기석,신익조,강건아 성균관대학교 1990 論文集 Vol.41 No.2

상온 및 200℃∼600℃의 Si(111) 7×7 표면에 칼륨(K)을 증착하였을 때의 표면격자구조 변화를 RHEED로 관측하였다. K 증착시 Si(111)7×7 기판의 온도가 상온인 경우, 어느 일정한 증착시간(포화덮임률에 도달했다고 추정되는 증착시간)이 지난 후에는 원래의 깨끗한 Si(111)7×7 패턴과 유사한 Si(111) 7×7-K 패턴이 관측되었고, 증착시간을 증가시켜도 RHEED 패턴은 변화하지 않았다. 이것을 annealing하면 350℃까지는 RHEED 패턴에 변화가 없다가 그 이상의 온도가 되면 서서히 원래의 7×7 패턴으로 되돌아가기 시작한다. Si(111) 7×7기판의 온도를 200℃∼600℃로 유지하면서 K을 일정시간(450℃에서 3×1이 형성되는 증착시간)이상 증착시킨 경우에 250℃까지는 상온의 경우와 비슷한 형태의 변형된 7×7 패턴이 관측되고, 300℃∼550℃일때는 3×1, 550℃ 이상에서는 1×1 구조가 관측되었다. 이때 300℃∼550℃에서 형성된 Si(111) 3×1-K 구조는 450℃에서 1분 정도 annealing 하면 항상 Si(111) 1×1-K 구조로 상전이가 일어남을 관측하였다. Potassium adsorbed surface structures of Si(111) 7×7 surface at room and high temperatures(200℃∼600℃) were investigated by RHEED. Potassium adsorption on the Si(111) 7×7 surface to saturated coverage at room temperature changed the RHEED pattern of Si(111) 7×7 to Si(111) 7×7-K. Subsequent heating of the Si(111) 7×7-K surface above 350℃ results in a Si(111) 7×7 with desorbing K. The RHEED pattern of the K-adsorbed on the Si(111) 7×7 surface up to the adsorption temperature of 250℃ was the modified 7×7 pattern, quite similar to that of the Si(111) 7×7-K, observed at room temperature. The 3×1 structure was observed in the temperature of adsorption between 300℃ and 550℃. Regardless of the adsorption temperature, a phase transition always took place from the Si(111) 3×1-K structure to Si(111) 1×1-K after annealing at 450℃ over 1 minute.

신 혈관근지방종 1례

이보배,이중화,조성중,설종구 충남대학교 의과대학 지역사회의학연구소 1986 충남의대잡지 Vol.13 No.2

Renal angiomyolipoma is an uncommon benign tumor of the kidney, with or without tuberous sclerosis, which is composed with mixture of adipose tissue, smooth muscle and blood vessel. Angiomyolipoma without tuberous sclerosis is usually solitary and unilateral, and is predominent in middle aged women. Its clinical and radiologic features are similiar with renal cell carcinoma, so its preoperative daigonosis is difficult, But recently, nephrotomography, ultrasonography and computerized tomography are helpful in diagnostic procedures. Herein we present a case of renal angiomyolipoma without tuberous sclerosis, in 27 years old male.

표재성 방광 이행상피세포암에 있어서 방광내 항암제주입요법 밀 면역요법

설종구,신보현,하용원,김윤종,노안식,손성용 충남대학교 의과대학 지역사회의학연구소 1999 충남의대잡지 Vol.26 No.2

Intravesical chemotherapy and immunotherapy will commonly eradicate residual papillary transitional cell carcinoma or carcinoma in situ(CIS) and clearly reduce the short-term incidence and rate of tumor recurrence. So I reviewed the effects and complications of different therapeutic agents(thiotepa, mitomycin-C, epirubicin, adriamycin, bacillus Cal mette-Cue'rin(BCG)) in superficial bladder cancer confirmed with histopathology, with the literatures. Bladder cancer were recurred more commonly in multiple tumors(50.6-56.3%), high grade tumors(52.6%) rather than in single(30.9%) and low grade(31.6%). And recurrence rates according to therapeutic agents were 83.3% in mitomycin-C, 71.4% in thiotepa, 50.0% in epirubicin, 46.6% in adriamycin and 32.6% in BCG. But incidence of complications were highest in BCG(50.5%). So sufficient preventive manuevers should be needed before intravesical theraphy, especially in BCG immunotherapy.

측두골에 발생한 골아세포종1예 : A Case Report

강보승,신진근,이원용,김종애 침례병원 2003 浸禮病院學術誌 Vol.19 No.-

초고진공 장치의 설계 및 제작과 LEED Optics에 의한 Auger Electron Spectrometer의 분해능 측정

이순보,박종윤,곽현태,부진효,이성용 성균관대학교 1992 論文集 Vol.42 No.2

A multipurpose Ultra High Vacuum chamber was designed and constructed in this laboratory. This enables us to be equipped with various analytical instruments such as Ar-ion gun LEED optics, Electron analyzer, and Quadrupole mass spectrometer etc. The 4-Grid LEED optics, a product of Omicron company in West Germany, was equipped with the UHV chamber and the LEED power supply was designed by this group. Turbo-C language figured out Auger spectra of the ad-species by means of the computer interface. The resolution of Auger electron spectrometer was measured with a constant primary electron beam energy. The results showed that the resolution was independent of the primary electron beam energy, but depends on the modulation voltage. Also, it was revealed that the resolution of 4-Grid optics was more improved than that of 3-Grid optics.

주의력 결핍 과잉운동장애의 신경생물학적 측면

최보문,김종은 大韓神經精神醫學會 1990 신경정신의학 Vol.29 No.4

Since the reports on the effect of stimulants in controlling motor restlessness, inattention and distractibility, efforts have been made to elucidate the mechanism of action of the stimulants, and pathophysiology of the attention deficit hyperactivity disorder. This review has attempted to summarize biological findings on attention deficit hyperactivity disorder, from the fields of neuropharmacology and neuroanatomy. Most of the studies demonstrated that catecholamine function and its modulation are very probably involved at some level in the pathogenesis and treatment of this disorder. Reports on several neuroanatomical lesions also have implications for the catelcholamine hypothesis of the disorder. Further studies focusing on the response to stimulants and physiological studies using brain imaging technology will provide more comprehensive model of the pathophysiology of the attention deficit hyperactivity disorder.

遲延行列을 이용한 時燮 確率시스템의 適應 필터 構成에 관한 硏究

徐輔爀,全舜鏞,全宗鶴 慶北大學校 1991 論文集 Vol.51 No.-

This paper presents a new adaptive filter algorithm for time-varying stochastic systems. Parameters of the objective system are identified using the Kalman kilter, in which the shift matrix method applied to construct a fine adaptive filter. The proposed filter characteristics 'are proved far better than the conventional algorithms, in which the LSQ approach is commonly used. Casestudy on sample model systems proves the usefulness and advantages of the proposed algorithm.