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Austenite Grain Growth Behavior of 30BF Steel Before Rough Rolling
Yong‑feng Chen,Jian‑bo Xie,Yan‑xin Wu,Jian‑xun Fu 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4
To investigate the eff ect of heat treatment on the grain size of austenite in 30BF steel, the comparisons of the morphologiesand sizes of austenite grains between heating samples were made with a high-temperature electric resistance furnace, andthe austenite growth models were built with method of mathematics. The results show that most grains in original specimenwith the sizes below 70 μm uniformly distributed. At a heating rate ( v ) of 10 °C/s, the grain size ( d ) value under a certain time( t ) increased by 60–100 μm with raising temperature ( T ) from 850 to 1100 °C, whereas the d value under a certain T merelyincreased by 70–120 μm with raising time to 60 min. Under v = 0.1 °C/s, T = 850 °C, and t = 0 s, the occupied ratio of grainswith sizes of 40–50 μm was 0.165, whereas at 900 °C, the occupied ratio was 0.125. The evolutions of ln (d5.8− d5.80 ) with1/ T were in negative linear correlations, whereas the ln (d5.8− d5.80 ) with ln t were in positive linear correlations. To sum up,the grain growth behavior of steel was elucidated.
대학생들의 여가경험과 몰입경험이 인지된 행복감에 미치는 영향
김보겸(Kim, Bo-Kyoum),신용업(Shin, Yong-Eup),장성호(Jang, Sung-Ho),이태현(Lee, Tae-Hyun) 한국체육과학회 2013 한국체육과학회지 Vol.22 No.3
This study examined the effect of University students’ leisure and flow experience on happiness. The research was made with 258 students from University which are located in Suwon, Ansan, and Yongin province. Survey data were collected through survey questionnaires and were analyzed with SPSS 18.0, and An10S 18.0 programs. The results of this study based on above methods and procedures were as followings. First, students’ leisure experience had significant effect on cognitive happiness. Second, students’ leisure flow experience had significant effect on cognitive happiness. Shin, Yong-Eup
노만택,조양자,김용식,최용,조보현,최장원,정용훈 大韓免疫學會 1996 大韓免疫學會誌 Vol.18 No.4
CTLA-4, a T cell activation antigen and a homologue of CD28, was originally identified as a gene by a series of reverse genetic approaches. While CD28 molecule has been characterized well as a stimulator of T-cell function via enhanced lymphokines production and stablilization of those mRNA, most of the functions of CTLA-4 remain unknown. It has been widely accepted that CTLA-4 functions as an immune suppressor which is down-regualting the function of CD28. We previously showed that 34 KD form of this antigen mainly expressed CD8+ subset, a cytotoxic or suppressor, of activated peripheral blood lymphocyte. Based on our previous finding this study was conducted to further characterize immunological function of CTLA-4 especially in terms of involvement of this molecule in T-cell effector function mediating target cell cytotoxicity. 4 human T cell clones with different target cytotoxicities were employed in this study. NBL46 (CD4+) and NBL77 (CD8+) were cytotoxic and NBL32 (CD4+) and NBL58 (CD 8+) were non-cytotoxic to target LBF cell in target cell chromium release assay. And in Western blot assay 34 kD antigen was detected in NBL46 (CD4+) and NBL77 (CD8+) clones but not in NBL32 (CD4+) and NBL58 (CD8+) clones. It was summarized that expression of the CTLA-4 antigen was associated with cytotoxicity but not with subset phenotypes of T cells. In conclusion CD8+ T subset of PHA-stimulated PBL was major and only CTLA-4 producer and this molecule was induced during mid to late stage of T cell activation. The cytotoxicity of T cell clones to its target cell was directly correlated with its CTLA-4 production and vice versa. And it was highly suggested that primary function of CTLA-4 may involved in T cell effector function which mediates target cell killing.
특성불안이 높은 성인과 낮은 성인에서 알코올이 정신운동성 수행과 주관적 평가에 미치는 영향
용화영,윤보현,윤진상 大韓神經精神醫學會 1996 신경정신의학 Vol.35 No.5
Objectives : The purpose of this study was to evaluate effects of alcohol on psychomotor performance and subjective assessments in normal adults with high and low trait anxiety. Methods : The subjects consisted of 11 men in each group were tested with two doses of alcohol(0.25g/㎏ and 0.75g/㎏). Blood alcohol concentration(BAC), psychomotor performance(critical flicker fusion threshold, CFFT ; choice reaction time, CRT) and subjective assessment were measured at pre-alcohol baseline and 20, 40, 80, and 160 minutes after intake of alcohol. Results : 1) There was no significant difference in BACs between two groups at any time points after intake of each dose of alcohol. 2) After intake of 0.25g/kg alcohol, high anxiety group, compared to low anxiety group, reported less anxious and more relaxed feelings. In psychomotor performance test, however, there was no significant difference between the two groups. 3) After intake of 0.75g/kg alcohol, CFFT was increased in high anxiety group while it was decreased in low anxiety group. In subjective assessment, only high anxiety group tended to show more positive response. Conclusion : These results imply that alcohol may be more beneficial in individuals with high trait anxiety than those with low trait anxiety in terms of objective performance and subjective feelings. Furthermore, these suggest that the alcohol benefits might contribute to drinking more alcohol and frequently in individuals with high trait-anxiety.
김보영,박용규,박형서,노상필,정승현,이유선,이정우,이재환,최시완,정진옥,성인환 충남대학교 의과대학 의학연구소 2003 충남의대잡지 Vol.30 No.1
Atherosclerosis is now viewed as an inflammatory disease of the vascular system. Expression of several chemokines, including monocyte chemoattractant protein(MCP)-1, MCP-4, RANTES(regulated on activation normal T-cell expressed and secreted), and interleukin-8(IL-8) are increased in human atherosclerotic plaques compared with normal vessels. They are involved in the pathogenesis of atherosclerosis and plaque rupture by activating and directing leukocytes into the atherosclerotic lesions. However, some are involved in homeostatic functions such as normal leukocyte traffic and growth regulation. SDF-la is a multi-functional cytokine that is involved in myelogenesis, hematopoiesis, angiogenesis and injured gastric mucosal regeneration in the gastric ulcer patient. SDF-la is recently shown to be highly expressed in atherosclerotic plaques and a potent platelet agonist. At least in high concentrations, SDF-la may mediate antiinflammatory and matrix stabilizing effects in unstable angina. Many studies are going on to know the function of SDF-la in coronary artery diseases. I investigated the difference of the plasma level of SDF-la between control group and coronary artery disease group. Total 75 subjects were enrolled. The diagnosis of coronary artery disease was confirmed in all patients by coronary angiography. Control subjects in this study were confirmed normal by coronary angiography. Clinical profile and risk factors were also reviewed. Control subjects in this study were 27 (M=10, F=17). Plasma for the study was collected before the angiography and centrifuged. SDF-la analysis was performed by ELISA. Plasma level of SDF-la is significantly increased in patients with stable angina(n=20) and unstable angina group(n=28) compared with healthy control group(n=27). the risk factors do not influence the plasma level of SDF-la in coronary artery diseases. In this study, plasma level of SDF-la is increased in patients with stable angina and unstable angina groups compared with healthy control group(P<0.05). the risk factors do not influence the plasma level of SDF-la in coronary artery diseases.
李輔泳 광주보건대학 1982 論文集 Vol.7 No.-
When private individuals are suffered damage by a nation's and a private institution's operation without private individual's blame, it is a matter of course that, in view of the principle of justice and equity, a nation and a public institution should pay for damages. This dissertation contains following contents. That is to say, the administrative compensation for damages is that, in such a case that, due to an official's illegal act and a fault of undertaking and equipment which a nation and a public institution manage and run, private individuals are suffered damages, a nation and a public institution should pay for damages. Such an adiministrative compensation for damages is based on modern individualistic thought and is on the basis of individual and morals ense of responsibility. But the system of compensation for damages is different from that of indemnity for losses which grow into the realization of fundamental principle,-social and balanced responsibility, -on the basis of collectivistic thought. But in recent time, under the close connection with the operation of a nation and a public institution, not only do both systems pay for damages occurring in private individuals, but also is there growing tendency that they are harmonized with grand scale of enterprise and magnification of national function. In our country, both systems are devided in the positive law.
발달장애학생을 위한 주제중심 통합단원 멀티미디어 학습자료 개발 : 수학과 화폐영역을 중심으로 with the Area of Money in Mathematics
김용욱,윤광보,김지원 한국정신지체아교육학회 2001 지적장애연구 Vol.3 No.-
발달장애학생의 교수ㆍ학습에서 학생들이 적극적이고 능동적으로 참여하는 경험중심, 생활중시의 교육이 강조되고 있다. 실생활 속에 모든 지식이 통합되어 있기 때문에 생활중심의 구체적인 생활사태와 당면한 주제 중심의 통합교육과정 및 교과통합지도가 필요하다. 본 연구는 통합의 요소에 따른 유형과 통합의 정도 및 구성 방식에 따른 유형을 살펴봄으로 발달장애학생의 위한 통합교육과정 모형으로 주제 중심의 통합을 선정하고 통합단원의 주제와 학습활동을 구성하였다. 화페영역을 중심으로 수학과와 연계된 교과의 공통된 학습내용과 적용 가능성, 생활중심 그리고 구현될 멀티미디어 요소를 함께 고려하였다. 이를 토대로 본 연구에서는 선정된 주제와 학습내용에 멀티미디어 요소를 접목하여 발달장애학생을 위한 화폐중심 통합단원 멀티미디어 학습자료를 개발하였고 이는 교과통합지도와 멀티미디어 학습자료의 필요성을 강조하는 현장 중심의 학습자료가 될 수 있다. 향후에는 교육과정에 개발된 학습자료를 통합하는 현장 적용 효율성에 관한 추후 연구가 필요하다. Recently, it is strongly considered that the real-life and experience centered education with students' active participation should be implemented to students with developmental disabilities in their learning activities. For this implementation, the curriculum and subject integration based on real-life stories and issues is necessary since all knowledge is included in the real life. In this study, there are 3 steps employed to develop a subject integrated multimedia teaching material. The first step is the selection of curriculum as a model of curriculum integration, and the second step is the process of subject and activity organization related with Mathematics, Koreans, and Social Science. The last step is to develop an integrated curricular applied multimedia factors such as graphic, image, and animation. As a result, the final product can be used as a teaching model applied an integrated curricular and multimedia in the special education classroom. The further study is necessary to validate its effectiveness when applied to students with developmental disabilities.
전용두,이금배,박진양,고석보,전희호 公州大學校 工學硏究院 生産技術硏究所 2005 論文集 Vol.13 No.-
Although the importance of good conservation of historic sites including ancient royal tombs is well aware, still not much attention has been paid for the facilities and systems to preserve those historic sites, which includes precious artifacts as wall paints and carved works, etc. Even the general understanding about the environment of the underground space of tombs is not satisfactory. In Korea, researchers have recently begun addressing the above issue and are making efforts to develop suitable HVAC(heating, ventilating and air-conditioning) systems for conservation of tombs. An experimental investigation was carried out to study the behavior of the HVAC system installed for a tomb. This tomb resembles in size and shape the original stone built tomb of Baek-je Dynasty, which dates back to 6th Century in southwest part of Korean peninsula. In this study, an HVAC system for a tomb(D×W×H=1.3m×3.0m×1.2m) was installed to maintain sui표 indoor conditions for conservation of tomb. The temperature and humidity inside the tomb were measured different of the setting. Finally, performance of the HVAC system is presented and discussed.
CV黑鉛鑄鐵의 黑鉛型態 및 機械的 性質에 미치는 Ni첨가 효과에 관한 연구
許甫寧,金水泳,南泰運,徐弘三,金學權 慶尙大學校 1985 論文集 Vol.24 No.1
In this study, an easy production method of CV (Compacted/vermicular) graphite cast iron with small addition of a Ni which is known as the element of the graphitization was investigated. And so, the effects of fading (holding) time and of Ni addition after the treatments with spheroidizer (Fe-Si-Mg-Ca-Al-Ti-Ce) were also investigated. The results obtained are as follows. 1. According as Ni contents in CV molten cast iron increase, the graphite No. and CV radio were increased. And so, graphite form and the distribution of the graphite were homogenized. 2. When the addition treated with Ni, the tensile strength were increased, and the effect of fading time were decreased.