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Kim, J.Y.,Park, M.C.,Kim, S.B.,Park, H.D.,Lee, J.H.,Kim, Jae-Myeoung Asian Australasian Association of Animal Productio 2009 Animal Bioscience Vol.22 No.8
This study investigated the effects of IGF-I and EGF on the development of blastocysts or hatched blastocysts during the in vitro culture of embryos from immature porcine oocytes. After the in vitro maturation and fertilization of cumulus-oocyte complexes (COCs) and their culture in vitro in PZM3 medium, we examined the embryo development rate for 168 h. When different concentrations of IGF-I (0, 1, 10, 20 ng/ml) were supplemented to fertilized porcine embryos in vitro, there were no significant differences in cleavage rate, blastocyst development rate or blastocyst hatching rate among the treated groups. On the other hand, when different concentrations of EGF (0, 1, 10, 20 ng/ml) were supplemented to the in vitro culture medium, blastocyst development rate was highest in the group in which EGF was not supplemented and, specifically, it was higher than in the 20 ng/ml treatment group (p<0.05). When 10 ng/ml IGF-I and 1 ng/ml EGF were supplemented separately or simultaneously, there were no significant differences among the treated groups in blastocyst hatching rate and the number of cells in each condition. This study demonstrated that the addition of IGF-I and EGF into PZM3 medium did not enhance development of the blastocyst stage and total cell number in blastocysts.
A Study on Die Wear Model of Warm and Hot Forgings
kang, J . H .,Park, I . W .,Jae, J . S .,Kang, S . S . 대한금속재료학회(대한금속학회) 1998 METALS AND MATERIALS International Vol.4 No.3
Factors influencing service lives of tools in warm and hot forging processes are wear, mechanical fatigue, plastic deformation and thermal fatigue, etc. Wear is the predominant factor for tool failure among these. To predict tool life by wear, Archard's model where hardness is considered as constant or function of temperature is generally applied. Usually hardness of die is a function of not only temperature but operating time of die. To consider softening of die by repeated operation it is necessary to express hardness of die by a function of temperature and time. In this study wear coefficients were measured for various temperatures and heat treatment for H13 tool steel. Also by experiment of reheating of die, die softening curves were obtained. From experimental results, relationships between tempering parameters and hardness were established to investigate effects of hardness decrease by the effect of temperatures and time. Finally modified Archard's wear model in which hardness is considered to be a function of main tempering curve was proposed. And finite element analyses were conducted by adopting suggested wear model. By comparisons of simulations and real profiles of worn die, proposed wear model was verified.
Modification of argon impurity transport by electron cyclotron heating in KSTAR H-mode plasmas
Hong, Joohwan,Henderson, S.S.,Kim, Kimin,Seon, C.R.,Song, Inwoo,Lee, H.Y.,Jang, Juhyeok,Park, Jae Sun,Lee, S.G.,Lee, J.H.,Lee, Seung Hun,Hong, Suk-Ho,Choe, Wonho International Atomic Energy Agency 2017 Nuclear fusion Vol.57 No.3
<P>Experiments with a small amount of Ar gas injection as a trace impurity were conducted in the Korea Superconducting Tokamak Advanced Research (KSTAR) H-mode plasma (<img ALIGN='MIDDLE' ALT='${{B}_{\text{T}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn001.gif'/> = 2.8 T, <img ALIGN='MIDDLE' ALT='${{I}_{\text{P}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn002.gif'/> = 0.6 MA, and <img ALIGN='MIDDLE' ALT='${{P}_{\text{NBI}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn003.gif'/> = 4.0 MW). 170 GHz electron cyclotron resonance heating (ECH) at 600 and 800 kW was focused along the mid-plane with a fixed major radial position of <img ALIGN='MIDDLE' ALT='$R$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn004.gif'/> = 1.66 m. The emissivity of the Ar<SUP>16+</SUP> (3.949 <img ALIGN='MIDDLE' ALT='${\mathring{\text{A}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn005.gif'/>) and Ar<SUP>15+</SUP> (353.860 <img ALIGN='MIDDLE' ALT='${\mathring{\text{A}}}$ ' SRC='http://ej.iop.org/images/0029-5515/57/3/036028/nfaa5333ieqn006.gif'/>) spectral lines were measured by x-ray imaging crystal spectroscopy (XICS) and a vacuum UV (VUV) spectrometer, respectively. ECH reduces the peak Ar<SUP>15+</SUP> emission and increases the Ar<SUP>16+</SUP> emission, an effect largest with 800 kW. The ADAS-SANCO impurity transport code was used to evaluate the Ar transport coefficients. It was found that the inward convective velocity found in the plasma core without ECH was decreased with ECH, while diffusion remained approximately constant resulting in a less-peaked Ar density profile. Theoretical results from the NEO code suggest that neoclassical transport is not responsible for the change in transport, while the microstability analysis using GKW predicts a dominant ITG mode during both ECH and non-ECH plasmas.</P>
방향성 연속주조된 Al-Cu합금의 연화처리에 따른 미세조직과 기계적 성질의 변화
제창웅,윤재홍,정동석 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-
Directionally continuous casted Al-Cu alloys used the components of electronic and electric equipment need to specify the properties of them and optimum drawing condition in order to manufacture a fine wire. Therefore, the present investigation has been carried out for clarifying the changes of macrostructure, microstructure, mechanical properties, and the interrelations of them during annealing heat treatment in order to manufacture a fine wire in directionally continuous casted Al-Cu alloys. Recrystalized grains were not observed at below 200˚C in Al-1%Cu and Al-28%Cu alloys annealed, however recrystalized grains were observed with increasing annealing temperature. Recrystalization was occurred at inclusion/matrix interfaces and also appeared at the inclusions of smaller radius with increasing reduction ratio.
MCM-C 기술을 이용한 저잡음 증폭기의 제작 및 특성 평가
조현민,임욱,이재영,강남기,박종철 한국마이크로전자및패키징학회 2000 추계 기술심포지움 논문집 Vol.2 No.1
We fabricated arid characterized Low Noise Amplifier (LNA) using MCM-C (Multi-Chip-Module-Cofired) technology for 2.14 GHz IMT-2000 mobile terminal application. First, We designed LNA circuits and simulated it's 171817 frequency characteristics using circuits simulator. For the simulation, we adopted high frequency libraries of all the devices used in LNA samples. By the simulation, Gain was 17 dB and Noise Figure was 1.4 dB. We used multilayer process of LTCC (Low Temperature Co-fired Ceramics) substrate and conductor, resistor pattern for the MCM-C LNA fabrication. We made 2 buried inductors, 2 buried capacitors and 3 buried resistors. The number of the total layers was 6. Qn the top layer, we patterned microstrip line and pads for the SMT device. We measured the high frequency characteristics, and the results were 14.7 dB Gain and 1.5 dB Noise Figure.
A Study on the Better Operation of Occupational Safety and Health Management Systems
Choi, Jae-Wook,Yoon, Seok-J.,Lee, Gwan-Hyung,Yang, H.S. The Korean Society of Safety 2005 International Journal of Safety Vol.4 No.1
This study was conducted to identity the characteristics of occupational health and safety management systems around the world, to survey the implementation of OHSMS in Korean companies, to find problems and corrective measures, and to understand the opinions of top management about OHSMS. Questionnaires on the operation of occupational health and safety management systems in Korean manufacturing companies were carried out. Occupational health and safety management systems around the world, including OHSAS 18001, BS8800, KOSHA 18001, VPP, J-OHSMS, were reviewed. In order to implement an occupational health and safety management system successfully, it was found that the management should consider occupational health and safety as important, provide employees with necessary training, and have a strong commitment to occupational health and safety.
Eicosanoid 유도체가 흰쥐 혈압 변화에 미치는 영향
윤재순,윤연숙,신정희,최현진,최진아 梨花女子大學校 藥學硏究所 1995 藥學硏究論文集 Vol.- No.5
Arachidonic acid (AA, C20:4, w-6) and eicosapentanoic acid (EPA,C20:5, w-3), which are polyunsaturated fatty acids forming eicosanoids, were tested for their effects on blood pressure in Wistar rats and SHR. AA is the most important precursor for the biosynthesis of eicosanoids which include the prostaglandins, prostacyclin (PGI_2), thromboxane A_2 (TXA_2) and the leukotriens. TXA_2 is a potent vasoconstrictor and a powerful inducer of platelet aggregation causing myocardial infarction and hypertention. In contrast, PGI_2 induces vasodilation and inhibits platelet aggregation. In this study, AA markedly increased blood pressure, but its effect was antagonized by both EPA a structural analog of AA, and dazmegrel, a TX synthetase inhibitor. Also, AA enhanced the antihypertensive effects of hydralazine and captopril, and EPA reduced TXA_2 production. These results indicate that the hypotensive effects of EPA might be closely related to the decrease in TXA_2 biosynthesis due to competitive inhibition by structural similarity of the EPA to the AA, the precursor of TXA_2.
범용 CNC 밀링에 의한 박막 측벽 파트 가공에 관한 연구
지성희,이동주,신보성,최두선,제태진,이응숙 한국공작기계학회 2001 한국공작기계학회 춘계학술대회논문집 Vol.2001 No.-
In order to suggest the proper optimal conditions of the CNC milling machining for the Thin-wall surface, some experiments were carried out. The process was applied in the aerospace industry for the machining of light alloys, notably aluminium. In recent year, however, the mold and die industry has begun to use the technology for the production of components, including those manufactured from hardened tool steels. And the end mill is an important tool in the milling process. A typical example for the end mill is the milling of pocket and slot in which a lot of material is removed from the work piece. Therefore the proper selection of cutting parameter for end milling is one of the important factors affecting the cutting cost. In this paper, we choose the optimal parameters(cutting forces) to cut thin-walled Al part by experiment