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최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2
In this study is about the fatigue characteristics which appears in the welding residual stress field. The welding residual stress takes place mostly at the portion where SS400 materials are automatical welded. The effects of the welding residual stress in the growth and propagation of fatigue crack, so as to study the fatigue behavior in the welding residual stress field. The results, in case of the load range is constant, as the stress ratio is changing to 0.1, 0.33. 0.5 the propagation life is constant but the growth life decreases. And than, when maximum load or minimum load is constant, as the stress ratio increases the growth life and propagation life increase. The fatigue crack propagations rate da/dN appears to accelerate when the stress intensity factor range △K is less than 15MPa-m^(1/2). The growing and propagation fatigue crack in the welding residual stress field is similar to original specimen after being passed the original residual stress field.
김장희,강대성 東亞大學校附設 淸報技術硏究所 2006 情報技術硏究所論文誌 Vol.13 No.2
In this paper, we propose a user friendly object-based image retrieval system using the interaction between the cortex and the hippocampus. We propose a method of automatic color object extraction using CSB tree map(Color and Spatial based Binary tree map). Extracted objects are transformed to bit stream representing information such as color, size and location by region labelling algorithm and they are learned by the hippocampal neural network using the interplay between the cortex and the hippocampus. Proposed hippocampal neural network makes an adaptive fast content-based image retrieval system using excitatory learning method that forwards important features to long-term memories and inhibitory learning method that forwards unimportant features to short-term memories controlled by impression.
Cisplatin에 의해 유발된 급성신부전에 단삼추출액이 미치는 영향
김충희,박희성,정장용 진주산업대학교 농업기술연구소 2005 農業技術硏究所報 Vol.18 No.-
한의학에서 강장약, 통경약, 진통약, 항염약, 지혈약으로 월경불순, 복통, 폐경, 산후통 등에 효과가 있다고 알려진 단삼(Salvia mulitorrhiza Bunge)이 cisplatin에 의해 유발된 신장의 세포손상에 대하여 항산화작용과 신장의 기능에 미치는 영향에 대하여 조사한 결과 다음과 같은 결과를 얻었다. 1. 단삼 추출액이 cisplatin에 의하여 유발된 신피질 절편의 독성효과에 대한 효과를 알아 보기위한 실험으로 300mM cisplatin에 노출시켰을 때 단삼 추출액 0.05%, 0.1%를 함께 첨가한 군이 LDH 유출 및 지질과산화를 유의성 있게 감소시켰다. 2. 단삼 추출액 0.3g/kg을 7일간 전처리 한 다음 cisplatin 5㎎/kg을 복강투여한 후 24시간 뒤에 혈액을 채취하여 혈청 BUN과 creatinine 농도를 측정한 결과, 단삼 추출액을 전처리 한 군에서 cisplatin 단독처리한 군보다 신장의 BUN 및 creatinine 제거율이 유의성 있게 높게 나타났다. 이상의 결과로 볼 때 단삼 추출액은 cisplatin에 의하여 유발된 신장의 독성효과에 대하여 항산화작용과 세포보호 작용을 나타내며, 신장의 기능에도 영향을 미쳐 BUN과 creatinine 제거율도 높게 나타내었다. 따라서 단삼이 신장의 세포손상이나 질환이 있을 경우 보호효과를 나타낼 것으로 생각되며, 이러한 계기로 단삼을 대량 재배하여 신장보호를 위한 기능성 식품을 개발할 수 있다면 신장기능부전환자나 단삼재배 농가에 큰 도움을 줄 수 있으리라 생각한다. Salvia mulitorrhiza Bunge is known to be effective on healthiness drug, pain-killing drug, anti-inflammation, hemostatic agent, irregular menstruaction, abdominal pain, menopause, after parturition pain activity in oriental medicine. In addition of the effects, I further investigated the effect Salvia mulitorrhiza Bunge extract(SMBE) on the antioxidant effect on a renal cortical slices cell and kidney protecting effects. The results were as follows. 1. When renal cortical slices separated from a rabbit's kidney were treated with oxidant 300μM cisplatin in the presence of 0.05% or 0.1% SMBE at 37℃ for 60min. Cisplatin caused an increase a LDH release and lipid peroxidation. Cisplatin also induced a increase in LDH release and lipid peroxidation. SMBE significant prevented cisplatin-induced increase in LDH release and lipid peroxidation. 2. Pretreatment with 0.3g/kg SMBE for seven day and treatment with 5mg/kg cisplatin by the intraperitoneal injection. After 24hours, BUN and creatinine in serum were measured. The results were that the pretreatment group with SMBE showed a significant clearance rate of BUN and creatinine in the kidney than the administering single agent group of cisplatin. These results indicate that lipid peroxidation plays a critical in cisplatin-induced acute renal failure. SMBE exerts the protective effect against acute renal failure induced by cisplain, and its effect may be attributed to an antioxidant action. Furthermore I suggest the development of functional food with SMBE for the kidney tissue damage or renal incompletion in human.
순수 Ti 용접재의 기계적 특성 및 피로크랙 성장특성에 관한 연구
최병희,이종범,정장만,장경천,최병기 朝鮮大學校 機械技術硏究所 2007 機械技術硏究 Vol.10 No.2
In this study, fatigue fracture often occurs due to the fatigue crack in the machine and welding structure and this is the result of severe operational environment, operational condition, and design condition caused by the large scaled and light weighted machine and structure in recent days. Therefore, safety and reliability should be secured to prevent the fatigue fracture of machine and structure, and the use of titanium has been increased in the metal material for the safety and reliability. The purpose of this thesis was to investigate the welding characteristics and fatigue crack growth characteristics of titanium, commonly using power station, aircraft and ship. The experimented material was TIG welded in order to look over the characteristics according to the notch position and compare with other material. The results, at the same welding condition, 4 pass specimen which had the smallest number of welding pass had the highest tensile strength with 51kgf/㎟ and the tensile strength of 4 pass specimen was 10% higher than the one of 7 pass specimen, and its elongation reduced about 30%. The initial fatigue crack growth characteristic is slower in this order, boundary zone < welding zone < HAZ < base metal. Especially boundary zone's growth speed is slower about 30 times than base metals.
이종현,신장규,이상룡,천희곤,조찬섭,심준환,류인식,박석홍,허정준,박기열 경북대학교 센서기술연구소 1994 연차보고서 Vol.1994 No.-
자동차의 air-bag 장치에 실용될 수 있는 압저항형 단결정 실리콘 가속도센서 칩을 개발하기 위하여 결정 실리콘 미세구조의 제조방법을 확립하고, 단위공정의 검증을 통하여 일괄공정에 의한 PROTO-TYPE 칩을 만드는 기술을 연구하였다. 단결정 실리콘 미세구조는 선택확산법을 이용하여 정확히 선택된 영역에만 air-gap을 형성하여 미세구조의 측면식각을 방지하는 선택확산법에 의한 실리콘 마이크로머시닝 기술로 제조하였다. 일괄공정을 위한 단위공정확립을 위하여 PROTY-TYPE 8빔 브릿지형 가속도 센서를 제조하였다. 제조된 칩의 가속도에 따른 출력전압은 선형성을 나타내고 있으며, 감도는 약 50 ㎶/V·g로 나타났다. 이 감도는 50G용 가속도센서의 사양을 만족하지 못했다. 이는 공정에 의한 문제라기 보다는 가속도센서의 시뮬레이션에 의해 설계한 구조가 이미 원하는 감도에 못 미친다는 것으로 생각된다. 따라서 2차 공정으로 제조될 가속도센서의 파라미터를 SuperSAP 유한요소 패키지를 이용하여 실리콘 미세구조부의 파라미터에 따른 특성을 시뮬레이션하였다. 설계된 50G용 가속도센서의 mass Pad의 반경 및 빔 길이, 빔 폭, 빔 두께, 그리고 mass의 각 파라미터 값은 700 ㎛, 120 ㎛, 5 ㎛, 1.0 ㎎ 이었다. 반도체 공정기술, 관성질량 제조법 및 선택확산을 이용한 마이크로머시닝을 사용하여 일괄공정으로 8빔 브린지형 가속도센서를 제조하였다. We researched the establishment of the silicon microstructure fabrication technique to develop a piezoresistive type silicon acceleration sensor chip and the technique to make a proto-type chip by the verification of the unit-process. Silicon microstructure is fabricated silicon micro-machining by selective diffusion method. This method prevent a side-etching of microstructure because selective diffused region is only formed an air-gap. We fabricated a proto-type 8-beam bridge-type acceleration sensor to establish the unit-process for the batch-process. The output voltage of the chip represented linearity with acceleration, and the sensitivity was about 50 ㎶/V·g. But this sensitivity dosen't satisfy the requirements of a practical acceleration sensor. The cause of this result is assumed not process problem, but the structure designed by simulation isn't suitable already. Threfore, the characteristics of parameters of the acceleration sensor that will be fabricated by 2nd-process is simulated by SuperSAP finite-element package. The determined parameter values of beam length, beam width, beam thickness, mass, and mass radius are 120 ㎛, 5 ㎛, 1.0 ㎎, and 700 ㎛, respectively. We fabricated 8-beam bridge-type acceleration sensor by batch-process using a semiconductor process technique, proof-mass fabrication method, and micromachinig using selective diffusion.