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.

림프양 간질을 동반한 위의 미분화 암종과 Epstein-Barr Virus 감염과의 관계

권태형,이중달 한양대학교 의과대학 1995 한양의대 학술지 Vol.15 No.1

Epstein-Barr virus(EBV) is known to be related to a nasopharyngeal lymphoepithelioma(LE) and undifferentiated carcinoma with intense lymphoid stroma(UCLS) of the stomach, which is histologically identical with LE. In this study, the prevalence of EBV infection in UCLS of the stomach was investigated by EBV-encoded RNAs(EBERs) in situ hybridization block applied to formalin-fixed, paraffinembedded sections from 12 gastric UCLS. These cases were collected during 8 years' period from 1986 to 1993 in Hanyang University Hospital. EBERs were present in 10 cases of 12 UCLS(83%), a similar proportion that has been observed in a Japanese series. The EBER positive signals were characterized by the presence of uniform hybridized grains in almost all carcinoma cells and by their absence from adjacent non-neoplastic epithelial cells and lymphoid cells of the stroma. In view of oncogenetic role, significance of EBV infection in UCLS cells was discussed.

Film중감지와 Film의 활용에 따른 화질특성의 고찰

권용재,이상모,김순희,김도형,최태균 한국건강관리협회 2000 건협 Report Vol.3 No.-

조정 및 카누훈련이 폐기능에 미치는 영향

권태동,전중기,김형렬 대구대학교 기초과학연구소 1998 基礎科學硏究 Vol.14 No.2

In the present study, an effort was directed to elucidate the effect of the physical training on the pulmonary function. Nine male athletics major student who have undergone regular physical training for more than five years were randomly chosen as the athletic subjects, and 9 regular male students who have not been engaged in any form of regular physiycal exercise or training were chosen as the non-athletic subjects, and a comparison was made between the two groups. The following were mainly observed by spirometry for the study respiratory rate, tidal volume, vital capacity, maximun voluntary ventilation (MVV), forced expiratory volume for 1 second (FEY, ), percent FEV, to forced vital capacty (FEV 1%), forced expiratory flow for initial 1 liter (FEF 0.2-1.2L), and forced mid-expiratory flow (FEF 25-75%) The results obtained are summarized as follow; 1) The respiratory rate, and tidal volume showed no significant difference between athletes and non-athletes. The VC and MVV in non-athletes was significantly (p< 0.05, p <0.01)increased to 5.552±0.138L, 158.2±3.11L/min comparing with 4.770±0.2444L, 128.3±9.1L/min in non-athletes. 2) FEV, was 4.781±0.193L in athletes and 4.249±0.136L in non-athletes ; FEV 1% 84.12±1.12% in athletes and 73.45±1.79% in non-athletes, both was significantly (p < 0.05)increased in athletes. 3) FEF0.2-1.2L/min was 296.4±11.7L/min in athletes and 227.7±14.5L in non-athletes ; FEF 25-75% was 3.673±0.119L/sec inathletes and 2.810±0.178L/sec in non-athletes, both showing significant(p<0.05) increase in athletes. 4) Some liscussions were made on these results. The lung volumes showed no significant difference between the two groups, but VC, MVV, FEV1, FEV, %, FEFO.2-1.2L and FEF25-75% in athletes were significantly (p<0.05, p<0.01, p< 0.05, p<0.05, p<0.05, p< 0.05 respectively)higher than in non-athletes. It is therefore concluded that the athletes have more powerful respiratory muscles, or higher compliance of the lung and thorax than the non-athletes.

전처리 방법에 따른 하수슬러지 가용화 비교연구

권재현,김봉준,김민규,염익태,김형수 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4

The pretreatment process was carried out to solubilize the sewage sludge for enhancing its biodegradability using alkaline treatment, ultrasonic treatment(l5kHz), ozone treatment and different combination of these three methods: alkaline followed by ultrasonic as well as ozone, and ultrasonic followed by alkaline. The solubilization efficiency was evaluated based on the SCOD/TCOD ratio and VSS/TS ratio. In results, the proper condition of alkaline treatment was shown as 30meq/l of NaOH, pH 12 and 3hours of reaction time. Solubilization efficiency increased to 17% from initial 2% based on SCOD/TCOD ratio under this condition. In ultrasonic treatment, the higher ultrasonic power, the longer treatment time and the lower sludge volume resulted in higher solubilization respectively. There was a rapid increase in solubilization efficiency after 20 minute, then it was measured as 32% of SCOD/TCOD ratio in 1 hour at a ultrasonic power of 1,300W with 1/sludge. Solubilization efficiencies in combined treatment using alkaline and ultrasonic were 47-53% higher than single treatment at a sonicated time of 1 hour. Ozone treatment followed by alkaline treatment also represented the enhanced solubilization compared to ozone treatment. Therefore, ultrasonic or ozone treatment assisted by alkaline could achieve the short treatment time as well as high solubilizetion efficiency.

흰쥐에서 탄수화물 종류가 운동시 당 및 지질대사에 미치는 영향

권태동,전중기,민경선,김형렬,장응찬 대구대학교 기초과학연구소 1998 基礎科學硏究 Vol.15 No.2

The purpose of this study was to investigate the effects of glucose, sucrose, and glucose polymer(GP) ingestion on the carbohydrate and lipid metabolism during treadmill running in rats. Rats were randomly assigned to normal, control and carbohydrate groups. Carbohydrate group was divided into glucose, sucrose and GP ingested rats. The experiment was carried out after overnight fasting. Rats were administrated either normal saline(control) or carbohydrates solutions of formulated glucose(6%), sucrose(6%) and GP(6%) via polyethlene tube to stomach before treadmill run. Exercise was loaded by a treadmill run at the speed of 1 km/hour for 30, 60 and 120 minutes. The results of experiment were as follows: Plasma glucose levels were decreased in proportion to the exercise time in control, but increased at treadmill run 30 minutes and then gradually decreased with the lapse of the exercise time in carbohydrates compared with normal rats. It decreased in control, glucose, sucrose and GP compared with normal rats in decreasing order at treadmill run 120 minutes(% change of plasma glucose level of control, glucose, sucrose and GP compared with normal rats were 67, 74, 87 and 91 in plasma glucose level at treadmill run 120 min., respectively). Plasma lactate levels were increased by the exercise loading compared with normal in control and carbohydrates ingested rats. It increased in control, sucrose and GP in increasing order compared with normal rats, at treadmill run 120 minutes(% change of plasma lactate level of control, glucose, sucrose and GP compared with normal rats were 167, 185, 149 and 114 in plasma lactate level at treadmill run 120 min., respectively). Plasma FFA levels had tendency to increase by the exercise loading compared with normal in control and carbohydrates ingested rats. It showed increase in the sucrose, glucose, GP and control rats in Increasing order compared with normal rats at treadmill run 120 minutes(% change of plasma FFA level of control, glucose, sucrose and GP compared with normal rats were 151, 153, 166 and 152 in plasma FFA level at treadmill run 120 min., respectively). Plasma acetoacetate levels were higher in control compared with carbohydrates ingested rats at treadmill run 30, 60 and 120 minutes. Plasma beta-hydroxybutyrate levels increased by exercise compared with normal rats in control and carbohydrates ingested rats at treadmill run 30, 60, 120 minutes. Plasma insulin levels were decreased in proportion to the exercise time in control compared with normal rats, but in carbohydrates ingested rats increased at treadmill run 30 minutes and then gradually deceased with the lapse of the exercise time compared with normal. In carbohydrates ingested rats, plasma insulin levies were higher than control. Hematocrit did not show any difference between control and carbohydrates rats at treadmill run 30, 60 and 120 minutes. From these experimental results, it is suggested that the exhaustion of skeletal muscle glycogen, the hypoglycemia, the overproduction of lactate and dehydration is delayed in carbohydrates ingested rats. GP of the carbohydrates is considered as the most effective for these effects. Therefore, intake of carbohydrates before exercise, especially GP seems to increase performance in the prolonged moderate exercise.

전도성 Cu-Zn 페라이트 복합 용사피막의 특성

김태형,권기현,박경채 대한금속재료학회 2003 대한금속·재료학회지 Vol.41 No.5

In this study, the heating unit of direct-heating method was manufactured as being the thermal spray coating of conductive heating material on the surface of heating unit in order to improve the demerits of indirect-heating method. And Cu-Zu ferrite had the properties of thermal conduction and high electrical resistivity was chosen of the conductive heating material. Cu-Zu ferrite composite powders were fabricated by drum type ball milling. The atmospheric plasma spray(APS) process was used to deposit the coatings of Ni-5.5Al-5Mo powders for the bonding layer, Al_2O_3 powders for the electrical insulating layer and Cu-Zn ferrite composite powders for the electrical heating layer onto the Al substrate. The plasma sprayed coatings were performed the heat-treatment at 300℃, 405℃ and 600℃. In order to evaluate the plasma sprayed coatings performance, the coating powder observated microstructure, XRD analysis and EDX mapping analysis and mechanical and electrical properties of plasma sprayed coatings. In the result of observations of microstructures, mechanical properties and electrical properties, the best sprayed coatings with direct heating unit was concluded the sprayed coatings that was heat-treated at 300℃.

개선된 등가 T-S 퍼지 모델 구성 방법

민형기,권성하,정은태 국립7개대학공동논문집간행위원회 2003 공업기술연구 Vol.3 No.-

This paper presents an improved method that constructs an equivalent T-S fuzzy model for nonlinear systems expressed by nonlinear differential equations including terms of power series. The proposed method has fewer numbers of the rules than the previous methods as well as exactly expresses nonlinear systems. Moreover, this method can get wider feasible area satisfying the stability conditions than the previous methods. We show the improvement of modeling by comparing the proposed method with two previous methods through an inverted pendulum on a cart.

연세대학교 치과병원에 내원한 어린이에서의 영구치 맹출 시기 및 순서

강태성,최병재,권호근,손홍규,최형준 大韓小兒齒科學會 2005 大韓小兒齒科學會誌 Vol.32 No.4

치아의 정확한 맹출 시기와 그 순서는 어린이의 발육 성숙도의 지표로서 소아치과 임상 및 예방 교정치료에 있어서 매우 중요하다. 이에 2001~2003년에 연세대학교 치과대학병원 소아치과에 내원한 어린이중 만 5세부터 만 14세까지의 남자 654명, 여자 542명, 총 1,196명의 자료를 수집하여 영구치의 맹출 시기 및 순서에 대한 연구 결과 다음과 같은 결론을 얻었다. 1. 상악 영구치의 맹출 시기는 중절치 남 만6.81세, 여 만6.78세, 측절치 남 만8.30세, 여 만7.98세, 견치 남 만10.28세, 여 만10.04세, 제1소구치 남 만9.74세, 여 만9.90세, 제2소구치 남 만10.87세, 여 만10.41세, 제1대구치 남 만6.25세, 여 만6.54세, 제2대구치 남 만12.21세, 여 만12.03세, 여 만12.03세였다. 2. 하악 영구치의 맹출 시기는 중절치 남 만6.00세, 여 만6.06세, 측절치 남 만6.99세, 여 만6.74세, 견치 남 만9.83세, 여 만9.17세, 제1소구치 남 만9.92세, 여 만9.75세, 제2소구치 남 만10.66세, 여 만10.39세, 제1대구치 남 만5.99세, 여 만5.75세, 제2대구치 남 만11.92세, 여 만12.17세였다. 3. 영구치의 맹출 순서는 상악에서 제1대구치, 중절치, 측절치, 제1소구치, 견치, 제2소구치, 제2대구치의 순이었고, 하악에서 제1대구치, 중절치, 측절치, 견치, 제1소구치, 제2소구치, 제2대구치의 순이었다. Accurate timing and sequence of eruption of permanent teeth are indicies of growth and essential for pediatric dentistry and pediatric clinical orthodontics. From the children brought to the Yonsei Dental Hospital during 2001 to 2003, 654 boys and 542 girls, ranging in age from five to fourteen years, were selected and analysed. The following was concluded. 1. Eruption time of maxillary teeth is 6.81 years in boys, 6.78 years in girls for central incisor, 8.30 years in boys, 7.98 years in girls for lateral incisor, 10.28 years in boys, 10.04years in girls for canine, 9.74 years in boys, 9.90 years in girls for first premolar, 10.87 years in boys, 10.41 years in girls for second premolar, 6.25 years in boys, 6.54 years in girls for first permanent molar, 12.21 years in boys, 12.03 years in girls for second permanent molar. 2. Eruption time of mandibular teeth is 6.00 years in boys, 6.06 years in girls for central incisor, 6.99 years in boys, 6.74 years in girls for lateral incisor, 9.83 years in boys, 9.17 years in girls for canine, 9.92 years in boys, 9.75 years in girls for first premolar, 10.66 years in boys, 10.39 years in girls for second premolar, 5.99 years in boys, 5.75 years in girls for first permanent molar, 11.92 years in boys, 12.17 years in girls for second permanent molar. 3. The following eruption sequence was observed: the first permanent molar erupted first, followed by the central incisor, the lateral incisor, the first premolar, the canine, the second premolar and the second permanent molar in the maxilla. The first permanent molar erupted first, followed by the central incisor, the lateral incisor, the canine, the first premolar, the second premolar and the second permanent molar in the mandible.

Effects of Oxygen Pressure on the Crystalline of ZnO Films by PLD Method

조재형,허태봉,곽진성,권대영 부산대학교 유전체물성연구소 2005 유전체 논문집 Vol.4 No.

We studied the effects of oxygen pressure on the ctystalline of ZnO films on sapphire(001) substrates were deposited by the pulsed laser deposition (PLD) technique and were grown at various oxygen pressure ranging from 5 mtorr to 150 mtorr to investigate the effect of ambient O2 pressure on the structural properties of the films. We found that the lattice constant along the c-axis and the crystalline of ZnO films are sensitive to the O2 pressure.