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ION-SELECTIVE ELECTRODES OF FERRITE MEMBRANES
원충택,박면용,오평제,이원,박기채 상명대학교 논문집 1993 상명대학교논문집 Vol.31 No.-
산화제2철 또는 산화제2철과 마그네슘, 구리, 니켈, 혹은 아연을 몰비가 0.6:2.4, 0.8:2.2, 1:2, 1.2:1.8 및 1.4:1.6 (M:Fe, M=Mg, Cu, Ni, Zn) 인 혼합물로 Ferrite막 전극을 만들어 이온 선택성 전극으로 사용될 가능성을 연구하였다. 이들 전극막 재료는 각각 900, 1,000, 1,100, 1,200, 1,300, 및 2,614-2,700℃에서 소결되었다. 소결 온도가 높을수록 이온 감도와 선택성이 컸다. 산화제2철만을 사용하였을 때 보다 산화제2철을 Mg,Cu,Ni 또는 Zn과 혼합하여 2,164-2,700℃ 에서 소결된 전극들이 이온 선택성이 우수하였다. 이들 전극의 전기저항치는 10^2 메그옴정도이다. 모든 전극의 정전앞감응을 pH3 및 10사이에서 관찰하였는데, 은(I), 인산염(III), 인산일수소염(II), 인산이수소염(I) 및 비소(V, III)에 민감하게 감응되었다. 이들전극은 물속에 계속해서 담궈두면 내구도가 6개월 정도였다.
최홍용,노충희,최희석 인제대학교 1986 仁濟醫學 Vol.7 No.3
A case of horseshoe kidney associated with bilateral renal stones and variation of the renal vessel was presented with a brief review of the literatures. The patient was managed by ureterolithotomy and ureteroureterostomy because UPJ was compressed with aberrant renal vein. The result was good.
Giga Bit DRAM 을 위한 MOS DEVICE 축소 한계
이충훈,이재철,오용호 圓光大學校 基礎自然科學硏究所 1995 基礎科學硏究誌 Vol.14 No.1
실리콘 반도체 집적 소자와 공정의 현재 발전 상황과 전망을 살펴 보았다. 현재 반도체 생산 현장에서는 16M DRAM을 대량 생산중이고, 64M DRAM이 대량 생산을 준비 중에 있다. 연구소 수준의 256M DRAM이 개발되었으며, 1G DRAM의 연구가 진행 중에 있다. 0.06∼0.1㎛ 크기의 단위 소자를 위한 연구도 연구소에서 진행되고 있으며, 이 크기는 20여년 전 B.Hoeneinsen과 C.Mead에 의해 예측된 실리콘 소자의 한계인 ∼0.2㎛를 이미 초월해 있다. 본 논문에서는 반도체 소자 및 공정 상의 여러 제약과 문제점을 소개하고 해결책을 제시한다. 이러한 문제점은 Sub-quarter micron소자의 문제, 0.1㎛ 근처의 소자 축소 문제, 0.1㎛근처의 소자를 위한 Lithography 및 Etching 관련된 기술적인 발전, 고집적 DRAM위한 고 유전을 물질의 개발, 고속 소자 및 유전체 평탄화 등이다. 결론으로써, 소자 가공의 현재의 연구 방향 및 미래의 전망을 표로써 정리한다. In the following pages, we will review the current status and the prospects for silicon semiconductor devices and process technologies. At present, the 16M DRAM is under mass production, and 64M DRAM is being prepared mass production. In addition, a fully operational 256M DRAM has been developed at research level. Furthermore, new silicon devices with a minimum feature size in the 0.06∼0.1㎛ are under development. This minimum feature size is less then half the physical limit of ∼0.2㎛ predicted by B.Hoeneinsen and C.Mead 20 years ago. This limitation and various other obstacles to the development of semiconductor engineering are the topics of this paper. These obstacles include; devices issues of sub-quarter micron size, device scaling problems near0.1㎛, technical development related to 0.1㎛ lithography and etching, high and low dielectric materials for the higher density, higher speed devices, and dielectric planarization. And in summary, we present a table which illustrate the current research direction and future prospects for device fabrication limits.
CT performance phantom을 이용한 cone beam형 전산화단층영상의 특성
한충완,김규태,최용석,황의환 대한구강악안면방사선학회 2007 Imaging Science in Dentistry Vol.37 No.3
Purpose : To evaluate the characteristics of (widely used) cone beam computed tomography (CBCT) images. Materials and Methods : Images were obtained with CT performance phantoms (The American Association of Physicists in Medicine; AAPM). CT phantom as the destination by using PSR 9000N™ dental CT system (Asahi Roentgen Ind. Co., Ltd., Japan) and i-CAT CBCT (Imaging Science International Inc., USA) that have different kinds of detectors and field of view, and compared these images with the CT number for linear attenuation, contrast resolution, and spatial resolution. Results : CT number of both PSR 9000N™ dental CT system and i-CAT CBCT did not conform to the base value of CT performance phantom. The contrast of i-CAT CBCT is higher than that of PSR 9000N™ dental CT system. Both contrasts were increased according to thickness of cross section. Spatial resolution and shapes of reappearance was possible up to 0.6 mm in PSR 9000N™ dental CT system and up to 1.0 mm in i-CAT CBCT. Low contrast resolution in region of low contrast sensitivity revealed low level at PSR 9000N™ dental CT system and i-CAT CBCT. Conclusion : CBCT images revealed higher spatial resolution, however, contrast resolution in region of low contrast sensitivity was the inferiority of image characteristics.
조용근,홍성표,장충현,이두형 大韓成形外科學會 1991 Archives of Plastic Surgery Vol.18 No.1
We cultured the keratinocytes from different donors for 3 weeks and the cultured keratinocyte sheets were applied to the 15 cases of patients who had hypertrophic scars on their extremities. (auto-??allografting) And the applied keratinocyte sheets were studied for the adaptation, growth ?? differentiation with light and electron-microscopy. The results were as follows; 1. Grafted epidermal cells started differentiation from second week post-grafting and showed a similar appearance to the normal epidermis at fourth week post-grafing. 2. Keratohyalind granules were seen from fourth week post-grafting and showed a normal appearance at fifth month post-grafting. 3. Immature desmosome-tonofilament complexes were seen at cultured epidermal sheet and showed a normal appearance at fifth month post-grafting. 4. Rete ridges showed its appearance at fourth week post-grafting and showed a normal appearance at fifth month post-grafting. 5. Fine structures of epidermo-graft bed junction showed a discontinuous appearance at second week post-grafting and showed a normal continuous appearance at fifth month post-grafting. In summary, the 'take' of grafted epidermal sheets begins at fourth week post-grafting and completed at fifth month post-grafting.
위 유문동근 K^+ - 경축에 미치는 Vanadate의 효과
김충수,고인송,엄대용,이상돈 중앙대학교 의과대학 의과학연구소 1988 中央醫大誌 Vol.13 No.3
Effects of vanadate on the spontaneous contraction and the high K^+-induced contracture of guinea pig’s pyloric antral smooth muscles were observed in the various Na^+ and/or Ca^+ of bathing solutions. Following results were obtained; 1. Basal tension and developed tension of the spontaneous activity were increased by vanadate and the membrane potential tended to be depolarized. 2. Phasic contracture increased, tonic contracture decreased as the outside K^+ concentration increased and the both components were increased by vanadate. 3. In the case of absence of K^+ and/or Na^+, the contracture were hardly developed and the spontaneous, rhythmic contraction were sustained. 4. Effects of vanadate on the K^+-contracture and the Ca^2+-sensitivity of the Phasit and tonic components were prominent in the presence of Na^+. The above results suggested that vanadate would increase the voltage-dependent calcium current in smooth muscle cells of the pyloric antrum.