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곽사호 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.2
This study aims to contribute to the inprovement of ex-reactor components for nuclear generation, such as steam generators, superheater, tubing materials, turbine blades, etc.. And in this paper the duplex structure and mechanical properties, especially tensile strength, creep-rupture strength, hardness in the weld HAZ, weld cracking characteristics, etc. of middle Cr and high Cr ferritic heat resisting steels were investigated. Creep-rupture test was carried out in the air by the lever type single specimen equipment. Specimens for metallographic examination were etched with Vilella's reagent. The results obtained are summarized as follows : 1. The duplex structures of middle chromium and high chromium ferritic heat resisting steels exhibit beneficial mechanical properties, weldability and creep-rupture strength. 2. 12Cr-2Mo-V duplex steels are so good in weldability, elongation, elevated temperature formability and creep-rupture strength that they are anticipated to be suitable for boiler tubes, superheater, reheater, FBR steam generator, etc. in a nuclear power plant. 3. 12Cr-2Mo steels show better weldability and creep-rupture strength than full-martensitic 12Cr-1Mo steels. But the former exhibits lower tensile strength than the latter. 4. 0.09C-7Cr-3Mo steel gives better mechanical properties than 0.06C-7Cr-3Mo steel except for weldability.
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張鎬鉉,文炳淳,金世吉 圓光大學校 韓醫學硏究所 1992 원광한의학 Vol.2 No.1
The present experiments were designed to investigate the effects of Kyogamdan(交感丹) water extract on the Heart Functions. The inhibitory effects of Kyogamdan on the contractility of cardiac muscle and ATPase activities were analyzed with Physiogram and enzyme Kinetics. 1. Kyogamdan water extract decreased the contractility of ventricular muscle with the increased concentration of Kyogamdan extract. 2. The (Mg^++ -Ca^++) -ATPase activity decreased with the increased concentration of Kyogamdan EXTRACT, AND THE VALUES OF Ki and Km were 0.1 and 2.2 respectively. 3. The cerebral cell membrane(Na^+ -K^+)-ATPase activity increased with the increased concentration of Kyogamdan extract. 4. Verapamil (calcium antagonist )also inhibits the (Mg^++ -Ca^++)-ATPase and thus Kyogamdan was suggested to act as a blocking agent on the calcium active transport. 5. Electric Shock induced the abnormal secretion of AST, CK and LDH, however, the oral administration of Kyogamdan extract recovered the abnormal release of the enzymes. From the above results, it was suggested that the effects of Kyogamdan on the heart act as a stabilizer against stress.
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大學新聞과 一般新聞의 比較硏究 : 그 內容分析을 中心으로 On the basis of the content analysis of the articles
李文浩,洪思滿,呂恩暎 慶北大學校 1982 論文集 Vol.33 No.-
This study was designed to present the desirable leading line of the academic journalism, by comparing the university press with the daily newspapers. Both The Daihak Shinmun, The Korea University Press published in 1981 and The Kyungpook University Times published from 1976 to 1981 were chosen as the reference data for this research. To begin with, the writer educed the four functions of the acadmic journalism from the data, by applying the functions of daily newspapers, mass commanication to the university press. The four functions are like the following. 1. presenting and surveillancing the academic environment. 2. molding and leading the public opinion of university. 3. linking and affiliating the members of university. 4. forming a new standard of value. According to the accomplishment of these function, all the articles appeared in the university press could be sorted out into four patterns, namely, campus news, special reports, special columms, and advertisements. Depending on the examination of the data, the followings can be concluded: 1. Due to the biweekly publishing system, the function of presenting and surveillancing the academic environment can hardly be achieved. 2. Since most articles are written by students, the linking between facutly members and students each other and creating academic culture is not be carried out as required. 3. Running mainly literary works in most columns except editroial, the university press increasingly appears to take the shape of a literary megazine. 4. The commercial advertisements take up too much space and space for news reports is relatively being encroached.
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張宰豪,金世吉 圓光大學校 韓醫學硏究所 1995 원광한의학 Vol.5 No.1
The present experiments were designed to investigate the effects of Mahwangbuja-seshintang on the cardiovascular system by using the methods of measurement of blood pressure, Mg^2+ -Ca^2+ -ATPase activity of cardiac endoplasmic reticulum and digital inflared thermograph imaging analizer. In order to control the precise chemical and physical animal conditions, the experimental animals were supplied with calorie limited food. The results obtained were summarized as follows: 1. Mahwangbujaseshintang water extract increased the blood pressure and heart beat rate in the anesthetic rabbits. 2. Mahwangbujaseshintang seemed like to stimulate autonomous sympathetic nerve α and β receptors. 3. Mahwangbujaseshintang demonstrated the antihistamine effect by contracting the capillary, and thus it decreased the body surface temperature. 4. Mahwangbujaseshintang increased the blood pressure and heartrate by contracting the body surface capillaries. According to the above result's Mahwangbujaseshintang water extract has the curative effect on the heart disease and blood flow.
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2相耐熱鋼의 임계영역(α+γ)에서의 加熱維持時間이 定常크리이프에 미치는 영향
梁權承,郭士濩 조선대학교 기초과학연구소 1985 自然科學硏究 Vol.8 No.1
In this study the effects which the holding time in the intercritical region(α+γ) of 1000℃ has on the steady state creep of 6543 steels(12Cr-2Mo) and 6546 steels(12Cr-2Mo-2Ni) were investigated. These steels were developed for elevated temp. tubing applications by Climax Molydenum Co in America in 1982. The relations between the steady state creep and the redistribution of solute atoms and microstructure changes during intereritical anneal and creep testing according to holding time were in particular studied. The results obtained are summarized as follows: 1) 6546 steels (2% Ni added) maintained higher creep strength than 6543 steels (free of Ni) in short-term creep test while in the longer-term 6543 steels surpassed 6546 steels. It seems that nickel is effective for the formation of martensite responsible for the rise of short-term strength, and not for the longer-term creep strength. This is significant in the light of economy for the development of high temp. Materials. 2) In 6543 steels tensile and yield strength are at their best at the 1.5 hr holding time and afterwards decrease progressively. But in 6546 steels tensile property doesn't change much upto 30 hr holding, while yield strength tends to decrease from the 15 hr holding time. That's attributed to coarsening of grains, It is assumed from these facts that the effect of graim size on the mechanical properties is greater in yield strength than tensile strength. 3) 6543 steels lose their strengthening effects through coarsening of grains as the holding time lasts longer than 1.5 hr. 4) It is assumed that for the precipitates of Laves phase in this 12Cr-2Mo steel the concentraion differences between the α and γ phase are decisive and that its precipitation occurs initially in the ferrite. 5) In the duplex structure steels, Mo, Cr, etc. are partitional rich in ferrite phase during creep test and cause the precipitation of M_23C_6, Fe_2Mo, M_6C, etc., which contributes to strengthening the matrix. But martensite phases are dissolved during creep test. It is considered that the long-term creep strength is achieved more by the strengtheining of ferrite structure than that of martensite. 6) 6543C steel solution-treated at 1000℃ for 1.5 hr revealed the strongest creep rupture strength of all 6543 steels at 550∼600 ℃. That's because the precipitates of M_23C_6, Fr_2Mo, M_6C, etc. are so large in numbers and fine, and their stability is excellent.
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Gwak, Sah-Ho,Baik, Seung-Nam,Jang, Woo-Yang 조선대학교 생산기술연구소 1986 生産技術硏究 Vol.8 No.2
This paper aims to study the effect of nickel contents on the mechanical properties by adding nickel upto 2.6% to 12 chromium ferritic heat resisting steels. In this study hardness, impact value, tensile strength, and low-strain and creeprupture strength were closely measured. And the analyses and examinations of carbide precipitates and fracture surfaces were also carried out by a X-ray diffractometer, a scanning electron microscope, a transmission electron microscope, etc .. The results obtained are summarized as followos : 1) The creep properties are closely associated with the changes in the stability of the carbide precipitates. 2) Increasing the nickel content improves the impact and toughness properties at room temp. but has a deleterious effect on both low-strain and creep-rupture strength at elevated temperatures. 3) Increasing the nickel content increases the rate of dissolution of M₂X precipitates and accelerates the coarsening of M_(23)C_(5) carbides. 4) The more stable carbide structures with low nickel contents are associated with high creep strength. 5) Hardness increases with nickel contents below the tempering temp of 530℃, whereas beyond the temperature it decreases.
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Sah, Shyam Kishor,Park, Kyung Ho,Yun, Chae-Ok,Kang, Kyung-Sun,Kim, Tae-Yoon Mary Ann Liebert 2016 ANTIOXIDANTS AND REDOX SIGNALING Vol.24 No.5
<P>Aims: The immunomodulatory and anti-inflammatory properties of mesenchymal stem cells (MSCs) have been proposed in several autoimmune diseases and successfully tested in animal models, but their contribution to psoriasis and underlying pathways remains elusive. Likewise, an increased or prolonged presence of reactive oxygen species and aberrant antioxidant systems in skin are known to contribute to the development of psoriasis and therefore effective antioxidant therapy is highly required. We explored the feasibility of using extracellular superoxide dismutase (SOD3)-transduced allogeneic MSCs as a novel therapeutic approach in a mouse model of imiquimod (IMQ)-induced psoriasis-like inflammation and investigated the poorly understood underlying mechanism. In addition, the chronicity and late-phase response of inflammation were evaluated during continued activation of antigen receptors by applying a booster dose of IMQ. Results: Subcutaneous injection of allogeneic SOD3-transduced MSCs significantly prevented psoriasis development in our IMQ-induced mouse model, likely through a suppression of proliferation and infiltration of various effector cells into skin with a concomitant modulated cytokine and chemokine expression and inhibition of signaling pathways such as tolllike receptor-7, nuclear factor-kappa B, p38 mitogen-activated kinase, and Janus kinase-signal transducer and activator of transcription, as well as adenosine receptor activation. Innovation and Conclusion: Our data offer a novel therapeutic approach to chronic inflammatory skin diseases such as psoriasis by leveraging immunomodulatory effects of MSCs as well as SOD3 expression.</P>
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Cu-Zn-Al 형상기억합금의 변태온도에 미치는 결정립도의 영향
곽사호,고제만,장우양 조선대학교 동력자원연구소 1986 動力資源硏究所誌 Vol.8 No.2
A Cu-20.6 wt.% Zn-5.7wt.%Al alloy containing 0.1 wt.% Zr has been chosen as a model alloy for the study of grain size effects on characteristic transformation temperatures in grain refined copper-based shape memory alloys. The variation of the thermal treatment results in a range of grain size change, causing a shift of as much as 15℃ in transformation temperatures M_s, M_f, A_s and A_f, and in the shape change temperatures T_hs, T_hf, T_cs, and T_cf. The extent of the reverse transformation during shape recovery is significantly enhanced to higher temperatures compared to the reverse martensite → parent phase transformation obtained by the resistivity measurements. In addition, the transformation temperature hysteresis as given by M_s-A_s and T_hs-T_cs is found to be independent of grain size. The Transformation temperatures were shifted to lower ones by decreasing the grain size, except for the T_cf temperature which increases as grain size is reduced. This transformation temperature-grain dependence has been found to be depended on Hall-Petch type relation.
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Lee, Ho Jung,Sah, Injin,Kim, Donghoon,Kim, Hyunmyung,Jang, Changheui Elsevier 2015 JOURNAL OF NUCLEAR MATERIALS Vol.456 No.-
<P><B>Abstract</B></P> <P>The oxidation characteristics of the electron beam surface-treated Alloy 617, which has an Al-rich surface layer, were evaluated in high temperature helium environments. Isothermal oxidation tests were performed in helium (99.999% purity) and VHTR-helium (helium of prototypical VHTR chemistry containing impurities like CO, CO<SUB>2</SUB>, CH<SUB>4</SUB>, and H<SUB>2</SUB>) environments at 900°C for up to 1000h. The surface-treated Alloy 617 showed an initial transient oxidation stage followed by the steady-state oxidation in all test environments. In addition, the steady-state oxidation kinetics of the surface-treated Alloy 617 was 2-order of magnitude lower than that of the as-received Alloy 617 in both helium environments as well as in air. The improvement in oxidation resistance was primarily due to the formation of the protective Al<SUB>2</SUB>O<SUB>3</SUB> layer on the surface. The weight gain was larger in the order of air, helium, and VHTR-helium, while the parabolic rate constants (<I>k<SUB>p</SUB> </I>) at steady-state were similar for all test environments. In both helium environments, the oxide structure consisted of the outer transition Al<SUB>2</SUB>O<SUB>3</SUB> with a small amount of Cr<SUB>2</SUB>O<SUB>3</SUB> and inner columnar structured Al<SUB>2</SUB>O<SUB>3</SUB> without an internal oxide. In the VHTR-helium environment, where the impurities were added to helium, the initial transient oxidation increased but the steady state kinetics was not affected.</P>
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