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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.
Tae‑Woon Hong,Sang‑In Lee,Jae‑Hyeok Shim,Myoung‑Gyu Lee,Joonho Lee,Byoungchul Hwang 대한금속·재료학회 2021 METALS AND MATERIALS International Vol.27 No.10
An artificial neural network (ANN) model was developed to predict the tensile properties as a function of alloying elementand microstructural factor of ferrite-pearlite steels. The input parameters of the model were composed of alloying elements(Mn, Si, Al, Nb, Ti, and V) and microstructural factors (pearlite fraction, ferrite grain size, interlamellar spacing, and cementitethickness), while the output parameters of the model were yield strength and tensile strength. Although the ferrite-pearlitesteels have complex relationships among the alloying elements, microstructural factors, and tensile properties, the ANNmodel predictions were found to be more accurate with experimental results than the existing equation model. In the presentstudy the individual effect of input parameters on the tensile properties was quantitatively estimated with the help of theaverage index of the relative importance for alloying elements as well as microstructural factors. The ANN model attemptedfrom the metallurgical points of view is expected to be useful for designing new steels having required mechanical properties.
Korean English Teacher's Disempowerment in English-only Classes
Sung-Sam Hwang,Hyo-Sun Seo,Tae-Young Kim 한국사회언어학회 2010 사회언어학 Vol.18 No.1
Hwang, Sung-Sam, SeD, Hyo-Sun, Kim, Tae-Young. 2010. Korean English Teacher's Disempowerment in English-only Classes: A Case Study Focusing on Korea-specific Cultural Aspects. The Sociolinguistic journal of Korea 18(1). In this case study, we have focused on the disempowerment of a Korean English teacher (KET) in English-only classrooms. Six English as a foreign language (EFL) classrooms in a Korean high school were observed and analyzed by using interpretive discourse analysis. Out of the six classes, three representative classrooms were both video- and audio-taped. The results show that the English-only classes could weaken the KETs' power via three mechanisms: (a) calling the KETs' last name for choral greetings at the beginning of the class, (b) students' group solidarity and peer pressure between classmates, and (c) the students' excessively collaborative approach to peer assistance. It is argued that the exclusive English-only instruction disempowers the KETs' status and dismantles their vocational identity. In order to remedy the current situation, within a scaffolding supported by the eclectic use of first language where necessary for effective class management, KETs are empowered and overcome constraints imposed by the limited L2 oral competence of some non-native English teachers.
Tae‐Kyun Hong,Kym‐Na‐Ra Hwang,Jun‐Ran Kim,Young‐Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The toxicity of Kaempferia galanga rhizome materials and constituents against Meloidogyne incognita second‐stage juveniles (J2) and eggs were examined. The active principles of K. galanga rhizome were identified as the phenylpropanoids ethyl (E)‐cinnamate (EC, 1) and ethyl (E)‐p‐methoxycinnamate (EMC, 2) by spectroscopic analysis. Results were compared with those of carbofuran, fosthiazate, and metam‐sodium. In direct‐contact mortality bioassay, EC (LC50, 0.037 mg/ml) was the most toxic constituent, followed by EMC (0.041 mg/ml). EC was more effective than carbofuran (LC50, 0.092 mg/ml) but less active than fosthiazate (0.002 mg/ml). EC, egg hatch was inhibited 100, 93, and 87% at 125, 62.5, and 31.25 μg/ml, respectively. EMC caused 100, 81, and 75% inhibition of egg hatch at 125, 62.5, and 31.25 μg/ml, respectively. The inhibition of two phenylpropanoids were similar or more inhibition to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In contact + fumigant mortality bioassay, EC and EMC treatments resulted in 86 and c 73% mortality at 0.5 and 0.125 mg/g soil, respectively. The lethality of these phenylpropanoids was almost similar to that of either carbofuran or metam‐sodium but was lower than that of fosthiazate. In vapor‐phase mortality bioassay, EC and EMC were more effective in closed container than open containers, indicating that the mode of delivery of these compounds was, in part, a result of vapor action. K. galanga rhizome‐derived materials, merit further study as potential nematicides and hatching inhibitors for the control of M. incognita populations.
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.
師範系 體育敎育科 志望生의 一般運動能力檢査 基準値 設定에 關한 硏究
梁點紅,高基俊,黃喆文,金泰運,金重雄,白永鎬,表內淑,黃太相,徐國雄 釜山大學校 附設 體育科學硏究所 1989 體育科學硏究所 論文集 Vol.5 No.-
This study was analyzed the validity and the reliability of evaluation norm. which was used in choosing and grading events of the General Motor Ability Test. The General Motor Ability Test has been done for applicants for entrance to the department of physical education, college of education, Pusan National University. The subjects of this study were 433 applicants(men :387, women :46) for three years. They were tested in seven events : 1) 100m Dash, 2) 1500m Run(man), 800m Run (woman), 3) Throwing Hand-Ball, 4) Broad Jump, 5) Chinning(man), Flexed-Arm Hang(woman), 6) Zig-Zag Run, 7) Trunk Flexion. The results could be summerized as follows ; 1. In 100m Dash, 1500m Run, and Throwing Hand-Ball, man's average records were shown normal distribution which was inclined toward low ll grade. Therefore, the interval size of those three events must be regulated to lower. 2. Average records of Broad Jump in man were distributed into high (1) grade. So, the interval size must be adjusted to higher. 3. In Chinning, Zig-Zag Run, ad Trunk Flexion, man's average records were shawn normal distribution, and the interval size was similar to present records. 4. For woman, it was impossible to analyze correctly in all seven events because of the small number of subjects. So, it was for the sake of the reference. 5. The record of applicants for three years were operated to the variable quantity analysis. And the restults were these ; 100m Dash was F=3.0865(p<0.05), Chinning F=3.9309(p<0.05), Broad Jump F=14.7338(p<0.001), Throwing Hand-Ball F=4.9716(p<0.01), and Zig-Zag Run F=6.8297(p<0.001). Then, it was shown statistical meaningful difference in three groups. 6. In investigating the validity in choosing seven events, it was concluded that the events have been chosen reasonably. Because all events except for 100m Dash, and Zig-Zag Run in man were independent. From the analysis of the General Motor Ability Test, we could realized the necessity of regulating the standard and the interval size in several events. Then, we proposed the new evaluation norm which was suitable to present situation.
Thomas Anold의 體育觀과 Rugby School에 관한 硏究
黃太相,趙源敏 釜山大學校 附設 體育科學硏究所 1997 體育科學硏究所 論文集 Vol.13 No.-
This study was conducted by Thomas Anold, the representative of a modern reformer and an idea of physical education's phenomena and the purpose in the rugby school. The purpose of Thoams Anold's the education reformation in the rugby school was that he influenced the school principal of christianity to students to destroy unmorality and to build the christian school in school. To do that, the problem was to recreate school principle's control and the moral effect to school. Students' voluntary activities were provided and these activities developed as organized games. There were two factors wether Thomas Anold was the reformer of physical educational or not. In the previous studies and books mentioned that he was educational reformer. However, he was not to influence the physical education in the pure perspective. Another word, he was not a man of thought in the physical education. As a matter of fact, he influenced sports activities at rugby school activities. In Thom Brown's school days, it was found that sport activities were very active at the rugby school. In a novel, team sports were more popular than individual sports such as cricket and rugby. The team sports were utilized as educational system in this novel. For instance, the purpose of improving team sports influenced to create the proper social attitudes and sportsmanship through team sport activities. In the rugby school, a lots of time were admitted for games. A cricket and a rugby play were admitted two hours on an every (13:30-15:30) the Tuesday, the Thursday, and the Saturday at school. Also, traditional sport was "the big side run" and cricket, and Crik is one of running sport which was held in regular program.
Edward Hitchcock의 체육사상이 19C 미국 대학 체육에 미친 영향에 관한 연구
황태상 창원대학교 체육과학연구소 1998 경남 체육연구 Vol.3 No.2
본 논문은 최초로 미국 대학에서 체육 교수로 임명되어 19세기 미국 초기 대학체육에 선구자적 역할을 수행한 히치코크(Edward Hitchcock)의 체육사상과 업적을 중심으로 당시 미국 학교체육에 미친 영향을 탐구하고자 하였다. 체육에 대한 최초의 중요한 대학 프로그램은 암허스트 대학에서 시작되었으며, 히치코크는 체육학과의 철학에 대하여 "이 학과의 유일한 목적은 정상적 표준까지 신체적 건강을 유지시키는 것" 이라 하였으며, 대학 체육 프로그램에서 체육과 같은 과목을 포함하는데 대한 주된 이유는 학생들의 건강을 증진시키는데 대한 체육의 잠재력이었다. 히치코크는 체육수업에서 가벼운 체조, 행진, 달리기, 속보 들을 행하였으며, 이런 운동들은 처음 15분에서 20분으로 변경되었으며, 나머지 30분은 자발적인 운동으로 이루어졌다. 어떤 학생들은 무거운 기구를 사용했으며, 오래달리기, 댄스, 곤봉, 노래, 줄다리기, 공중돌기, 운동, 스포츠 또는 레크레이션을 위한 적당한 운동을 그들 자신이 하였다. 히치코크는 오늘날까지 사용하고 있는 두가지 수업방법을 발달시켰다. 하나는 체육수업에 참가할 학생들이 유니폼을 입는 것이며, 다른 하나는 수업에 반장의 이용이다. 하트웰과 세비지와 같은 반장들은 후에 유명한 체육가가 되었다. 대학 체육 프로그램에서 실내운동과 야외운동과 스포츠를 비교하면서 야외운동, 특히 스포츠의 중요성을 강조하였다. 이런 사상을 바탕으로 히치코크는 교내경기 형태의 경쟁을 위한 운동경기를 장려하였으며, 운동경기를 정규 체육수업에서 실시하여 발달시켰다. 19세기 후반기 체육방법상의 가장 중요한 발달은 체력 측정과 테스트의 방법이었다. 인체측정은 최초로 영국 체육가인 맥크라렌이 가슴둘레를 측정함으로써 시작되었으며, 히치코크는 체육과 관련하여 인체측정을 실시한 최초의 미국인이었다. 그가 행한 가장 당면한 혁신적 과제는 인간성장의 종단적 연구였다. 그가 인체측정학을 사용한 주된 목정은 평균 또는 이상적 대학생을 찾기 위해서였으며, 궁극적 목표는 학생들의 건강과 신체적 발달이었다. 히치코크는 몇 년간에 걸쳐 8개의 최초 측정 시리즈를 만들었다. 측정은 나이, 체중, 신장, 가슴둘레, 팔둘레, 전완둘레, 폐용적과 턱걸이의 8개 항목이었으며, 1861년부터 약 1880년까지 모든 학생들을 대상으로 실시되었다. 이상에서 히치코크의 체육사상과 프로그램은 수업방법과 내용면에서 종래의 체조 중심의 수업보다 진일보 하였음을 알 수 있으며, 특히 인체측정 분야에서의 선구적 역할과 측정항목과 측정방법의 개발에 지대한 공헌을 하였음을 알 수 있다.
황광성,김명규,정태상 진주산업대학교 산업과학기술연구소 2007 산업과학기술연구소보 Vol.- No.14
Air pressure Vane motor applied in this paper can be used very widely. Motor developed in domestic has about 80% efficiency of income product. Therefore, torque is increased because improve small size(1200rpm) Low-speed High torque type Air pressure Vane motor's quality of the material and special quality and do so that decelerate output and conclusion that consider and manufacture number of rotations and efficiency etc. Obtained results are summarized as follows: 1. Dust and corrosion can be reduced and 20% bulk of casing housing decreased by optimizing of alternated casing site. 2. Vane's wing optimum number is composed of 5 by Vane type wing and Gear Ratio's design choice and torque raised by eccentricity 28mm of rotor and cylinder and reduction of rpm (gear ratio 1/2.6). 3. Air pressure Vane motor's research and development connected with various output is judged that it is serious as for counter measure late.