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G91강 저주파 피로균열 성장에 미치는 온도와 응력비의 영향
김종범 ( Jong Bum Kim ),황수경 ( Soo Kyung Hwang ),김범준 ( Bum Joon Kim ),이종훈 ( Jong Hoon Lee ),박창규 ( Chang Gyu Park ),이형연 ( Hyeong Yeon Lee ),김문기 ( Moon Ki Kim ),임병수 ( Byeong Soo Lim ) 대한금속재료학회 ( 구 대한금속학회 ) 2012 대한금속·재료학회지 Vol.50 No.4
9-12% Cr steels have been used in thermal power plants which repeat start and stop operations. Major factors of fatigue life are temperature, frequency, stress ratio, holding time, microstructure, and environment. Normally, fatigue life decreases at high temperature, low frequency, high stress ratio, and long holding time conditions. A Mod.9Cr-1Mo steel, called G91, was developed at ORNL (Oak Ridge National Laboratory, USA) and was adopted as a high-temperature structural material in the ASME Code in 2004. However, its low-cycle fatigue and fatigue crack growth characteristics have been rarely studied. In this work, we have investigated the low-cycle fatigue crack growth behaviors of G91 steel under various test conditions in terms of temperature and stress ratio. As temperature and stress ratio increase, the crack growth rate becomes faster and striation distance also increases. On the other hand, the number of branch cracks decreases.
하선화,김제현,백융기,김종범,김종국,황영수 ( Sun Hwa Ha,Jai Hyun Kim,Young Ki Paik,Jong Bum Kim,Jong Guk Kim,Young Soo Hwang ) 한국응용생명화학회 1998 Applied Biological Chemistry (Appl Biol Chem) Vol.41 No.1
3-Hydroxy-3-methylglutaryl-CoA reductase (HMGR) catalyzes the conversion of HMG-CoA to mevalonic acid, the first intermediate of isoprenoid biosynthetic pathway in plants. The enzyme was solubilized with 0.4% Brij (polyoxyethylene ether) W-1 from a microsomal fraction of etiolated rice seedlings (Oryza sativa L.) in which its maximal activity was observed on the fourth day after germination. HMGR was purified to near homogeneity by employing (NH₄)₂SO₄ fractionation plus chromatographic procedures including DEAE-Sephadex A-50 and HMG-CoA-hexane-agarose affinity column. The size of the purified enzyme was estimated to be 55 kDa when judged by SDS-PAGE analysis with silver staining method. The apparent K_m and V_(max) values for HMG-CoA were determined to be 180 μM and 107 pmol/min/㎎, and those for NADPH were 810 μM and 32.1 pmol/min/㎎, respectively.
수소첨가에 의한 육불화황(SF6) 분해효율 향상 기초연구
류재용 ( Jae Yong Ryu ),김종범 ( Jong Bum Ki ),최창용 ( Chang Yong Choi ),장성호 ( Seong Ho Jang ),이상준 ( Sang Joon Lee ) 한국환경과학회 2012 한국환경과학회지 Vol.21 No.9
Destruction and removal efficiency (DRE) of SF6 was tested with low degrees of ionization. The applied dose of ionization energy varied from 63.70 to 212.34kGy. The initial concentration and flow rate of SF6 gas were 1,000ppm and 50L/min, respectively. In order to increase the DRE, injection of conditioning agent (H2) were conducted. The DRE of SF6 increased about 2 times with injection of H2 gas.
소아치과 영역에서 러버댐의 다양한 임상적 적용에 대한 증례보고
김종범,김종철,이성혁,장기택 大韓小兒齒科學會 1997 大韓小兒齒科學會誌 Vol.24 No.3
Usage of the rubber dam has been advocated by countless number of dentists. The advantages of the rubber dam such as the following are well-known 1. Moisture control. 2. Improved field of vision. 3. Ease of approach. 4. Soft tissue retraction and Injury prevention. 5. Prevention of aspiration of materials or instruments. 6. Shortened chair time. 7. Induction of nasal breathing during administration of N₂O-O₂sedation. Recent reports indicate the rubber dam can protect the dental staffs from the infection when treating HBV or HIV positive patients. Also, impreved moisture control and freeing of both handes allowed by the rubber dam makes it very useful when bonding orthodontic brackets. This case study presents the various clinial application of the rubber dam on patients visiting SNUDH dept. of pediatric dentistry to emphasize the importance of its use in pediatric dentistry.
청색파장(靑色波長)영역이 결여된 태양광이 작물의 생산성 및 내냉성(耐冷性)의 향상에 미치는 효과 : Ⅰ. 광합성 및 호흡의 전자전달계 활성의 변화
김종범,정진,민봉기 한국환경농학회 1986 한국환경농학회지 Vol.5 No.2
靑色光이 결여된 自然光이 작물의 生長特性에 미치는 효과를 조사하고 나아가 細胞生理學 측면에서 그 효과를 검토하였다. 光質 環境을 조절하기 위해서 本연구실에서 개발한 350∼500㎚ 波長영역의 청색광을 약 70% 제거하는 plastic film(BCR film이라 命名)으로 하우스를 설치하였고, 對照區는 無色 PE film으로 설치된 하우스를 이용하였다. 태양光중 청색광이 결여된 光質의 환경은 供試品種인 고추, 오이, 호박, 상치, 토마토에서 시설 원예적인 측면으로 볼 때 두가지의 注目할 만한 효과를 나타냈다. 첫째, 對照區에 비하여 全 作期에 걸쳐 보다 왕성한 生長力을 보였으며 현저한 增收를 가져왔다. 둘째, 低溫處理에 의한 냉해 發現 정도를 비교한 결과 耐寒 能力이 상당히 향상되었음을 관찰할 수 있었다. 이러한 효과는 세포內 小器官의 生理的 活性에 反映되어 있었다. 즉 BCR film下에서 자란 작물잎의 葉綠體는 白色光 對照區의 그것에 비하여 光合成전자전달계의 활성이 월등히 향상되었으며, 미토콘드리아의 呼吸전자전달계가 정상적인 활성을 유지하는 온도의 下限點이 對照區의 그것에 비하여 數℃ 하강되었다. The blue-light effect on the grown as well as on the physiological activity of some major horticultural plants in Korea has been investigated. The light quality used for the work was obtained from sunlight filtered by an orange-colored polyethylene film which removed about 70% of visible light in the spectral region of 350㎚∼500㎚. The film was developed in this laboratory especially for the work and named BCR film meaning blue color-removing film. The light environment in the plastic house which was built with BCR film provided plants with the blue color-deficient sunlight. Thus, the photobiological effect of blue light could be examined conversely by comparing with the effect of white sunlight in a conventional plastic house built with colorless polyethylene film. In a sense of applicability to horticulture, two remarkable effects of the blue color-deficient sunlight on plant physiology were observed: First, it enhanced to a great extent the growth activity of plants-pepper, cucumber, zucchini, tomato, and leaf lettuce-at the vegetative stage as well as at the reproductive stage, as demonstrated by their yield which were in average 40∼50% increased compared with the control (under white sunlight). Second, it improved significantly the cold tolerance of plants, as exhibited with their resistance to chilling during treatment in a cold chamber maintained at a temperature which caused chilling injury to the plants of control. The visualized effects were reflected on the physiological activity of cells on organelle level. Chloroplast isolated from the plant leaves grown under BCR film showed considerably stronger photosynthetic activity, as judged by the increased electron transport rate of illuminated chloroplast, than that from leaves grown under white PE film. Mitochondria from leaves grown under BCR film maintained normal respiration activity until temperature decreased to a few degree(℃) lower than the temperature which caused respiratory inhibition to mitochondria obtained from leaves of the control.