Misorientation Characteristics at the Growth Front of Abnormally-Growing Goss Grains in Fe–3%Si Steel

Tae‑Young Kim,Tae‑Wook Na,Hyung‑Seok Shim,Yong‑Keun Ahn,Yong‑Kwon Jeong,Heung Nam Han,Nong‑Moon Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.12

Penetrating morphologies at the growth front of abnormally-growing Goss grains in Fe–3%Si steel was examined in view ofthe possibility that they are the two-dimensional section of the solid-state wetting (SSW) along the triple junction line. Toobtain the statistically meaningful data, 102 penetrated grain and 204 penetrating abnormally-growing Goss grain morphologieswere examined. The misorientation angles of penetrating and penetrated grains were measured by electron backscattereddiffraction. Among the 102 examined penetrated grain boundaries, none has low misorientation angles less than 15°,whereas 17.2% of the 204 penetrating grain boundaries have low misorientation angles, and 23.5% of them have coincidencesite lattice boundaries. Besides, boundary energies of penetrating Goss grains, which were estimated from misorientationangles of the three grains in the penetrating morphology, satisfied the energetic condition for SSW along the triple junctionline. These results imply that the abnormal grain growth of Goss grains in Fe–3%Si steel occurs by the mechanism of subboundaryenhanced SSW.

생약제제인 이공산(異功散)의 Cisplatin 유도 신장독성 보호 및 항산화 효과

Lee, Kyung-Tae,Ahn, Kyoo-Seok,Chang, Sung-Goo,Oh, Soo-Myung,Jung, Jee-Chang 경희대학교 동서의학연구소 1999 INTERNATIONAL SYMPOSIUM ON EAST-WEST MEDICINE Vol.1999 No.1

Kyung-Tae Lee, Kyoo-Seok Ahn¹, Sung-Goo Chang², Soo-Myung Oh²and Jee-Chang Jung²¹College of Pharmacy, ²Oriental Medicine and ³College of Medicine, and East-West Medical Reserch Institute, Kyung Hee University, Seoul, Korea. Preventive and Antioxidative Effects of Crude Drug Preparation(E-kong-san) on Cisplatin Induced Nephrotoxicity. Proceedings of International Symposium on East-West Medicine, Seoul. 201-211, 1999. -Nephroprotective effects of a crude drug-prearation (E-kong-san) were determined from cisplatin on rabbit kidney proximal tubule and human renal cortical cells by MTT assays and sustained glucose consumption on ciplatin-induced human renal cortical tissue. Levels of creatinine and blood ure nitrogen(BUN) in serum after administration of cisplatin(0.75mg/kg,i.p.) to E-kong-san(0.75g/kg/day,p.o.)-pretreated rats were markedly lower compared to those of cisplatin-treated rats. Moreover, the administration of E-kong-san significantly inhibited the loss of body weight of cisplatin injected rts. These findings suggest that E-kong-san on the cisplatin induced nephrotoxicity led us to investigate whether the effect of this water extract was a result of anti-oxidation. E-kong-san showed strong free radical scavenger activities on 1,1-dipheny1-2picrylhydrazil(DPPH) radical and xanthine/xanthine oxidase(XOD) generated superoxide anion radical(O2-). We further studied the effects of E-kong-san on lipid peroxidation in rat liver microsomes induced by enzymatic and nonenzymatic methods. E-kong-san exhibited significant inhibition on both ascorbic acid/Fe2+and ADP/NADPH/Fe3+ induced lipid peroxidation in rat liver microsomes. Based on these results, we suggest that-E-kong-san attenuate the cisplatin induced cytotoxicity and its mechanism can be eplained by antioxidant.

자유곡면으로부터 단면정보를 이용한 황삭계획에 관한 연구

안대건,최홍태,이석희 한국경영과학회 1994 한국경영과학회 학술대회논문집 Vol.- No.1

This study deals with roughing planning by cross sectional information generated from sculptured surfaces. Bicubic Bezier surface is adopted as sculptured surfaces in this paper. The system consists of 3 parts : (1) modeling sculptured surface, (2) reconstruction of cross-section in 2D coordinates, (3) determination of roughing tool path with structural data. The system is developed by using IBM-PC in the environment of Auto CAD R11, AutoLISP and MetaWare High C. The proposed system shows an efficient algorithm for roughing planning with cross sectional informaiton.

퍼지 GMDH 알고리즘과 폐수처리 공정 시스템에의 응용

안태천,노석범,황형수,오성권 圓光大學校 1996 論文集 Vol.31 No.2

본 논문에서는 GMDH(Group Method of Data Handling) 알고리즘을 이용하여 퍼지 모델의 구조와 파라미터를 설정하는 알고리즘을 제안하였다. 퍼지 함의 규칙의 전건부 구조와 파라미터를 동정하기 위해 GMDH 알고리즘과 퍼지 추론을 사용하였고 최적의 후건부 파라미터를 동정하기 위해 최소 자승법을 사용하였다. 제안된 모델링 방법의 성능을 평가하기 위해서 가스로 시계열 데이터와 하수처리 데이터를 사용하였다. 제안된 방법을 사용하면 다른 모델에 비해 우수한 성능을 가진 지능 모델을 얻을수 있다. The Proposed fuzzy modeling implements system structure and parameter identification using the GMDH(Group Method of Data Handling) Algorithm. In this method, We use the GMDH algorithm and fuzzy inference to identify the premise structure and parameter of fuzzy implication rules and least square method to identify optimum consequence parameter. Time seris data for gas furnace and wastewatertreatment data are used for purpose of evaluating the performance of the proposed fuzzy.

소양호에서의 Alkaline Phosphatase 활성도의 Kinetics

안태석,김범철,조규송 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

The kinetics of alkaline phosphatase activity were studied at the surface of a warm monomictic large reservoir, Lake Soyang, every two months from February 1988 to June 1989. Three sampling stations were located at the dam site, near a large netcage-type fishfarm, and a tributary stream inlet region where the dinoflagellate blooming occurs in warm seasons. Vmax of alkaling phosphatase, showing the range of 0.02∼5.95μ/M/l/hr, was high during the spring bloom, April and June, and low during the turnover time, October, December, and February.Kt + Sn, showing the range of 0.06∼31.0μ/M/l,was high during the turnoner time, which seems to be caused by the nutrients supply from the hypolimnion. Kt+Sn was much higher during turnover time at the fishfarm station than other stations, which is obviously resulting from the large amount of fecal deposition at the bottom and the diffusion of organic phosphorus upto the surface. Tt seems that at high density phytoplankton itself can be the substrate for alkaline phosphatase, since the peak time of Kt+Sn coincided with the peak of chlorophyll a concentration in the shallow stream inlet station where dinoflagellates aggregate.

캡슐 발효유에 의한 변비 개선

안태석 江原大學校 附設 環境硏究所 1999 環境硏究 Vol.16 No.-

유산균 발효유 중 캡슐 제제를 사용한 경우 변비 증세가 개선되는가를 확인하였다. 변비의 자각증세가 있는 20명에게 하루 2회씩 캡슐 제제가 포함된 유산균 발효유를 14일간 복용하게 하고, 복용 중단 후 14일간 배변 상태 등을 설문하였다. 그 결과 음용기간 중 변비가 상당히 개선된 경우는 13명(65%), 조금 개선된 경우는 5명(25%)로 총18명(90%)가 변비가 조금 이상 개선되었다. 또 음용 중단 이후를 관찰한 결과, 상당히 개선된 경우가 16명 (80%)이며, 조금 개선된 경우는 3명(15%)로 총 19명(95%)이 개선되었다. 또 변의 상태가 음용 전후와 비교하여 부드러워진 경우는 15명(75%)으로 나타났다. 음용 후 복부의 긴장감과 불쾌감은 초기에는 많이 나타났으나, 음용 후반기에 들어서면서 대부분의 실험자가 없다고 대답하였다. 이 조사에서 캡슐제제의 유산균 발효유는 변비 개선에 상당한 효과가 있으며, 음용 중단 후에도 2주간지속되는 것으로 나타났다. Evaluation of capsulated yogurt for bowels was carried out. To the twenty volunteers who has selfconsciousness of constipation, the two bottles of capsulated yogurt were applied daily for two weeks. By the results, totally 90% of volunteers replied that their constipation was loosing during the application and 95% after the 2 weeks of stopping the application.

漢江上流 人工湖에서의 微生物 分布와 活性度에 관하여

안태석,이동훈,김범철,조규송 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-

The values of total hacterial numbers, heterotrophic bacterial numbers, the proportions of specific enzyme releasing bacteria and microbial activities were measured in the five artificial reservoirs in North Han river. The values of total bacterial number ranged from 0.62x10E5cells/ml, which is the common values in mesotrophic lakes. With the effect of civil construction at the upper region of the North Han river, the proportions of alpha-glucosidase-releasing bacteria were higher in Lake Paro and Lake Chuncheon. Beta-glucosidase proportions were high in Lake Paldang and showed high correlation with the concentration of chlorophyll a. The alkaline phophlatase proportion were higher in Lake Paro, Lake Chuncheon and Lake Paldang. The turnover rate of acetate showed no relationship with any other trophic state index intems, such as chlorophyll concentration, phosphate concentration and primary productivity. But the phosphatase activity showed high correlation coefficience, and it should be estimated as a trophic state index in these artificial reservoirs.

소양호에서 세균군집 크기에 미치는 폴랑크톤의 영향

안태석,정미정,이은주,조규송 江原大學校 附設 環境硏究所 1996 環境硏究 Vol.13 No.-

To scrutinize the biological effects of plankton communities to bacterial community, the total bacterial numbers, chlorophyll a concentration and phytoplankton, zooplankton communities were analyzed in Lake Soyang from May 13, to July 14, 1994. At 0m depth, total bacterial numbers positively coi-related with chlorophyll o concentration. On the other hand, at 2m depth, the two parameters had negative correlation. At the middle of the June, whe dominants of phytoplankton, zooplankton were changing, the bacterial numbers dropped down. These results suggest that as the Anabaena becoming dominant species, the some zooplankton species changed to bacterivore. The bacterial community was mainly effected by phytoplankton at 0m, and by zooplankton at 2m depth.

가정자로법에 의한 촉각궤환장치의 최적 설계

안인석,임태균 위덕대학교 부설 전자기술연구소 1999 전자기술연구소 논문집 : 위덕대 Vol.3 No.1

원격조종로봇 시스템은 인간 활동 영역의~확대와 복지 증진에 의해 세계적으로 널리 사용되고 있다. 이 로봇을 인간이 보다 효율적으로 조종하기 위해서는 조종자가 마치 현장에 있는 것과 같은 가상 현실감을 느끼게 하는 것이 중요하다. 그러나 현재까지 조종자에게 촉각정보를 제공하는 촉각궤환장치는 효과적이지 못하다. 이에 본 논문에서는 더욱 정교하고 효과적인 작업을 할 수 있도록 하는 원격조종로봇용 촉각궤환장치를 최적화 기법을 이용하여 설계하고자 하였다. 먼저, 어레이 형태로의 제작이 가능하여 세밀한 촉각 정보를 궤환시켜 줄 수 있는 새로운 촉각궤환장치 기구(mechanism)를 제안하였다. 이 기구는 전자석의 흡인력을 이용한 것이라 손가락 피부에 부착할 만큼 충분히 소형, 경량이며, 연속적인 선형 제어가 용이하고, 단위 크기당 비교적 큰 힘을 낼 수 있으며, 사용시 부작용이 없는 특징을 갖고 있다. 최적설계에 있어서는 최적설계의 목적함수를 촉각인식기구의 고찰을 통해 구하였고, 외형의 기하하적 관계와 인가 전류에 의해 발생되어진 온도조건을 구속조건으로 삼아 가장 큰 촉각력을 발생시킬 수 있도록 최적 설계를 수행하였다. 촉각력 계산은 가정자로법과 FEM(finite element method)을 통해 구하였다. 최적화 결과는 이전 제작 샘플보다 24%의 향상이 있음을 알 수 있었다. In a teleoperation robot system, it is important for an operator to feel as if he really were in a distant place. To realize this objective, the various information from remote site must be presented to the operator. Even though tactile information is very important to execute the task efficiently, it is not yet sufficiently provided for the operator. In this paper, it is proposed the new mechanism which provides the more dexterous tactile information to an operator. This device utilizes the electromagnetic force, so that it is small and light enough to attach on the fingerpad. It can also be ontrolled continuously. The magnetic circuit is derived by the probable flux paths method, to solve the force at any given dimension. The object of optimization is to maximize the tactile force which human can perceive under same conditions. the objective function is formulated as maximizing indentation displacement on the fingerpad in consideration of the mechanism of human tactile perception. The optimization formulation is subjected to geometric constraint and the rising temperature constraint in the coil. As a result of optimization, 24 % increases in the tactile force are accomplished, compared with the initial design.

파로호 수중생태계에서의 미생물 분포 및 활성도

안태석,이동훈 江原大學校 附設 環境硏究所 1989 環境硏究 Vol.6 No.-