Effect of Asymmetric Hot Rolling on the Texture Evolution of Fe–3%Si Steel

Tae‑Wook Na,Hyung‑Ki Park,박창수,Hyung‑Don Joo,Jong‑Tae Park,Heung Nam Han,Nong‑Moon Hwang 대한금속·재료학회 2018 METALS AND MATERIALS International Vol.24 No.6

In Fe–3%Si steel, the hot rolling process affects not only the hot rolling texture but also the primary recrystallization texture. Here, the effect of asymmetric hot rolling was studied by comparing the difference in the texture evolved between asymmetricand symmetric hot rolling. The effect of asymmetric hot rolling on the texture of primary recrystallized Fe–3%Si steel wasalso studied. The symmetric hot rolling of Fe–3%Si steel produces a rotated cube texture at the center but Goss and coppertextures near the surface. Asymmetric hot rolling tends to produce Goss and copper textures even at the center like thetexture near the surface. After primary recrystallization, the dominant texture at the center changes from {001} <210> to{111} <112> and the new texture has a higher fraction of the grains which make the low energy boundary with Goss grainsthan that of symmetric hot rolling.

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.

W-CDMA 상향링크에서의 2-D RAKE 수신기 시뮬레이터 제작

남원모,황태욱,김영수 경희-다반 ASIC 설계교육센터 2003 경희-다반 ASIC센터 논문집 Vol.4 No.-

본 논문에서는 W-CDMA 상향링크 기지국에서 빔 형성 기술을 적용한 2-D RAKE 수신기 시뮬레이터를 제작하고 그 성능을 배열 안테나 수, RAKE 가지 수 및 총 사용자 수에 따라 1-D RAKE 수신기와 비교 분석하였다. 본 논문에서는 도심환경에서 수신되는 신호의 방향성분과 다중접속간섭신호를 실제에 가깝게 모델링 하기 위해 기존의 모든 사용자의 위치를 고정시키는 방법 대신 셀 내의 다수 사용자는 임의의 위치에 존재함을 가정하여 시뮬레이터를 제작하였다. 기본적인 채널 모델은 Rappaport에 의해 고안된 GBSBEM(Geometry Based Single Bounce Elliptical Model)을 응용하였으며, 레일리 페이딩 채널을 가정하였다. 2-D RAKE 수신기의 배열 안테나 수가 증가함에 따라 빔 패턴의 주엽의 범위가 좁아지고. 따라서 다중접속간섭신호를 효과적으로 제거함으로써 비트오율 성능이 획기적으로 개선되는 결과를 얻을 수 있었다

특발성 척추측만증에서 견인 흉요추 보조기의 효과

박원욱,남태욱,안성준,유성호,문형근 대한척추외과학회 2003 대한척추외과학회지 Vol.10 No.3

전국 관청의 금연프로그램 실시 현황과 문제점

이상욱,오희철,이지전,김태욱,허남욱 韓國保健敎育.健康增進學會 2003 보건교육건강증진학회지 Vol.20 No.1

The purpose of this study is to investigate the conditions and problems of anti-smoking education programs in government offices for civil servants. A mail-in survey was carried out for the chief of the general affairs of 248 government offices. 1. There were 154 responses to the surveys. Only 34 govermental offices have carried out anti-smoking education programs for civil servants. 2. Only one office has a department to supervise an anti-smoking program. 17 offices have 1 worker and thirteen offices have no manpower to supervise anti-smoking program. 3. Only eight offices have budgeted for anti-smoking programs. The average budget was 3,750,000Won. Expected budget for smoking cessation program was 7,500,000 Won. 4. 25 offices have an anti-smoking lecture program for civil servants. Only five offices have an anti-smoking counseling services for smokers. 5. Only seven surveys responded that civil servants had a positive response to anti-smoking programs. 6. The most important problem of anti-smoking programs in governmental offices was the lack of concern of civil servants. Governmental offices have to provide the greatest administrative services and services concerning the quality of life for citizens. Anti-smoking education programs in governmental offices for civil servants was the beginning of an activity of the services concerning the quality of life for citizens. Governmental offices have to actively implement anti-smoking programs for civil servants.

우리나라(7차 교육과정)와 미국의 초등학교 과학과 교과서 3, 4, 5, 6학년의 지구과학영역 비교 및 분석

허남조,유병태,한영욱 부산교육대학교 과학교육연구소 2004 科學敎育硏究 Vol.29 No.-

The purpose of the present study was to analyze and compare an earth science sections of 3rd, 4th, 5th and 6th Grade Science textbooks of Korean and American Elementary School. Analysis forms are consisted of giving questions, inquiry processes and knowledges. Inquiry processes are divided by 12 subcategories such as observation, Classification, Measurement, prediction, inference, hypothesis, operational definition, variables control, data interpretation, model formation, experiment, and record and communication. Knowledge is divided into fact, concept and rule. Comparison items are contents, the numbers of pages and sentences, giving question, inquiry process and knowledge containing science textbooks. The results of analysis and comparison are as follows: 1. Three parts of Meteorologic, geological and astronomic parts are included by Korean and American texts in each grade. 2. The numbers of pages of the American textbooks are less than two times and those of sentences are more than seven times of those of korean textbooks. 3. Korean texts are emphasizing giving questions; the rate of questions in Korean Text is two times more than that in American textbooks. 4. Inquiry process is strongly emphasized in Korean texts. Knowledge is strongly emphasized in American texts.

부비동내시경수술 후 후각기능의 변화

김진국,남태욱,임채형,장현종 건국대학교 의과학연구소 2002 건국의과학학술지 Vol.12 No.-

Background and Objectives: Rhinosinusitis is the most common cause of olfactory impairment and endoscopic sinus surgery is considered as a surgical procedure of choice for treating chronic sinusitis. CC-SIT (Cross-Cultural Smell Identification Test) consists of 12 items well known in most non-English-speaking cultures. Authors evaluated the therapeutic effects of endoscopic sinus surgery on olfactory dysfuction using CC-SIT. Materials and Methods: The subjects of this study were seventeen sinusitis patient who had undergone ESS from November 2001 through April 2002. All patients were divided into two groups according to nasal polyp and CT findings. CC-SIT was used for the evaluation of olfactory function. Results: Forty seven percents of patients had improvement in olfactory function postoperatively. No correlation was found between changes in CC-SIT score and nasal polyp and preoperative CT findings. Conclusion: It is concluded that nasal polyp and CT findings have no effect on olfaction.

補中益氣湯이 납中毒된 흰쥐의 臟器重量에 미치는 影響

임종필,남궁동,강창수,강태욱 又石大學校 1994 論文集 Vol.16 No.-

Lead acetate and Bojungiki-tang extract, a herbal restorative were treated p. o. 40㎎/㎏ and 500㎎/㎏ respectively and concurrently to mouse, and examined variation of body weigh, accumulation of lead in organs of rats. The results obtained in this study are as follows: 1. Bojungiki-tang extract(BIT) resulted increase of body weight and the increase ratio of body weight in lead-treated group was dropped but the group of concurrent administration with BIT showed significant recovery. 2. The accumulation of lead in liver of lead-treated group increased but the group of concurrent administration with BIT showed significant decrease. 3. The ratio of liver weight/body weight of lead-treated group increased but the group of concurrent administration with BIT showed significant decrease. These results on the whole indicated that concurrent administration with BIT sowed significant recovery from the toxicity of lead-treated group.

비내시경을 이용한 안와 내벽 골절 정복 2예

김진국,남태욱,임채형,김재영,김정석 건국대학교 의과학연구소 2001 건국의과학학술지 Vol.11 No.-

Traditional surgical approaches to orbital medial wall fractures are either extraocular skin incision or indirect bicoronal flap. However these methods can leave remarkable orbital scar or scalp alopecia with possible complications. Endoscopic intranasal visualization of the medial orbital wall and lamina papyracea is a technique familar to otolaryngologists. This endoscopic view allows confirmation of fracture of medial orbital wall and herniation of orbital contents. Good visualization of the fracture can facilitate the anatomic reduction of orbital contents and the proper placement of orbital implant. Two cases of medial orbital wall fracture repaired by intranasal endoscopy using silastic sheet are reported.

플라즈마 표지소자의 제작

이상윤,라병욱,박동수,황인헌,이덕동,신영남,박성배,이동욱,박용석,박형근,손상호,권태근,채경락,정경득 慶北大學校 自然科學大學 1986 自然科學論文集 Vol.4 No.-

An Ac-type Plasma Display Panel (PDP) operating with Ne-Ar(0.1%) Penning mixture gas is fabicated. The characterics of the panel with electrodes covered with thin and thick dielectric layers are studied. The brightness of the Neon-orange light emitted by the panel measured as function of applied voltage and frequency. As an application, a graphic display system equipped with PDP showing still and moving pictures is made.