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M_(7)C₃형 크롬탄화물의 경도에 미치는 고용원소(V, Mo, Mn)의 영향
백응률,유국종,정재영,안상호 영남대학교 재료기술연구소 2000 재료기술연구 Vol.1 No.1
This study makes an investigation into the effect of dissolved alloy element (V,Mo,Mn) on hardness of the M_(7)C₃ type chromium carbide. Dis solved alloy element (V,Mo,Mn) content in M_(7)C₃ type chromium carbide was analyzed by EDS and micro- hardness of the M_(7)C₃ type chromium carbide was measured by micro- Vicker s hardness tester . Increasing to V, Mo content in specimen, result to increasing dissolved V, Mo content in M_(7)C₃ type chromium carbide. Also hardnes s of M_(7)C₃ type chromium carbide was increased. At this point , V added specimen was superior to Mo added specimen. According as Mn content in specimen increases , Mn cont ent in M_(7)C₃ type chromium carbide some increased but hardness in M_(7)C₃ type chromium carbide some decreased.
김진국,김종백 한국스포츠리서치 2004 한국 스포츠 리서치 Vol.15 No.5
The purpose of this study was to find out for how percept the school life who registered sport centers in university and to present developmental strategy for sport centers and university. The population of this study comprised customers of university sports center in Seoul and Kyonggi-do. Also, samples of this study Ware collected by using convenience sampling method. Total 400 questionnaire were presented but 365 were actually analysed. The questionnaire Was considered to be reliable since the Cronbach"s index were from .6912~.8576. To analyze the raw data, the statistical method used in this study was independent t-test, Frequency analysis, Factor analysis, one way ANOVA, Scheffe's post-hoc test. Based on aforementioned research method, the results can be as Follows: First, according to Perception Difference analyze focused on see, for school life, there are no significant difference. Second, according to Perception Difference analyze Focused on major for school life, there are significant difference between study Factor and school mate Factor. third, according to Perception Difference analyze focused on grade for school life, there are significant difference between study factor and school mate factor. fourth according to Perception Difference analyze Focused on used period For school life, there are significant difference between study factor and health promotion factor.
박종혁,석종식,목진호,박관,김영백,민병국,황성남,최덕영 대한신경외과학회 1995 Journal of Korean neurosurgical society Vol.24 No.6
In rare occasions in which aneurysmal neck clipping is nearly impossible, coating is employed. During the period from 1985 to 1992, 312 patients with aneurysm underwent surgery ; aneurysmal neck clipping were performed in 284 cases while coating only in 28. The reasons that coating was required were ; wide and broad neck in 13, perforators arising from the neck in 4, neck tearing during dissection in 3, very friable neck in 2, severe adhesion with surrounding structures in 3, and small aneurysm without enough room for clipping in 3. In twenty-three cases, cotton wisp and bioglue were used as coating materials. In another five cases, the aneurysmal wall was reinforced using Surgicel or Gelfoam. Patients were followed for 24 months on average of all the patients. Four had last contact Six died(4 due to rebleeding and 2 due to pneumonia). Fourteen were good and 4 were moderately disabled. There were no rebleeding incidences during first three months' follow-up after coating. We thus concluded that coating an aneurysm offers some protection from rebleeding, particularly when the rebleeding risk period is over.
청양 지역에 분포하는 트라이아스기 후기의 조계리층에서 산출된 규화목 화석
김종헌,백승덕,이원국 공주대학교 과학교육연구소 2003 과학교육연구 Vol.34 No.-
충남 청양 지역에 분포하는 트라이아스기 후기의 조계리층에서 규화목 화석이 발견되었다. 규화목 화석의 산출은 남한에 분포하는 하부중생계 지층에서 최초의 기록이다. 분류학적 연구결과, 구과류에 속하는 Xenoxylon sp.와 Dadoxylon sp.의 2속 2종이 식별되었다. 본 논문에서 구과류 화석의 특징과 비교 및 그 의미에 대해서 고찰하였다. Petrified wood fossils are discovered from the Upper Triassic Jogyeri Formation distributed in the Cheongyang area. The occurrence of petrified fossils is the first record in the Lower Mesozoic strata distributed in South Korea. As a result of anatomical study of wood fossils, two specie belonging to two genera of Xenoxylon sp. and Dadoxylon sp. which belong to conifers, are recognized. This paper deals with the characteristics, comparison and significance of conifer wood fossils.
장세진,고상백,강동묵,김성아,강명근,이철갑,정진주,조정진,손미아,채창호,김정원,김정일,김형수,노상철,박재범,우종민,김수영,김정연,하미나,박정선,이경용,김형렬,공정옥,김인아,김정수,박준호,현숙정,손동국 大韓産業醫學會 2005 대한직업환경의학회지 Vol.17 No.4
Background and Purposes: Over the past three decades, numerous studies performed in Korea have reported that job stress is a determinant risk factor for chronic diseases and work disability. Every society has its own culture and occupational climate particular to their organizations, and hence experiences different occupational stress. An occupational stress measurement tool therefore needs to be developed to estimate it objectively. The purpose of this study is to develop and standardize the Korean Occupational Stress Scale (KOSS) which is considered to be unique and specific occupational stressors in Korean employees. Subjects and Methods: Data were obtained from the National Study for Development and Standardization of Occupational Stress (NSDSOS Project: 2002-2004). A total of 12,631 employees from a nationwide sample proportional to the Korean Standard Industrial Classification and the Korean Standard Occupational Classification were administered. The KOSS was developed for 2 years (2002-2004). In the first year, we collected 255 items from the most popular job stress measurement tools such as JCQ, ERI, NIOSH and OSI, and 44 items derived from the a qualitative study (depth interview). Forty-three items of KOSS, in the second year, were retained for use in the final version of the KOSS by using Delphi and factor analysis. Items were scored using conventional 1-2-3-4 Likert scores for the response categories. Results: We developed eight subscales by using factor analysis and validation process: physical environment (3 items), job demand (8 items), insufficient job control (5 items), interpersonal conflict (4 items), job insecurity (6 items), organizational system (7 items), lack of reward (6 items), and occupational climate (4 items). Together they explained 50.0% of total variance. Internal consistency alpha scores were ranged from 0.51 to 0.82. Twenty-four items of the short form of the KOSS (KOSS-SF) were also developed to estimate job stress in the work setting. Because the levels of the subscales of occupational stress were gender dependent, gender-specific standard norms for both the 43-item full version and the 24-item short form using a quartile for the subscales of KOSS were presented. Conclusion: The results of this study suggest that KOSS might be an appropriate measurement scale to estimate occupational stress of Korean employees. Further and more detailed study needs to be conducted to improve the validity of this scale.
Density Correlation of Solubility of C. I. Disperse Orange 30 Dye in Supercritical Carbon Dioxide
Baek, Jong-Kook,Kim, Sunwook,Lee, Gwang-Soo,Shim, Jae-Jin 한국화학공학회 2004 Korean Journal of Chemical Engineering Vol.21 No.1
The solubility of C.I. Disperse Orange 30 (O30) dye in CO_(2) has been measured by using a closed-loop(batch) solid-fluid equilibrium apparatus at temperatures between 313 and 393K and at pressures between 11 and 33MPa. Kumar and Johnston's equation based on Chrastil's concept has been used to describe the experimental solubility data. The solubility versus density plot appears much simpler than the solubility versus pressure plot. The isotherms are nearly straight and parallel to each other, as seen in the previous studies. Peng-Robinson equation of state (PR EOS) has also been used successfully in modeling the dye solubility in supercriticial carbon dioxide as a function of pressure or density of the fluid phase. The validity of this method has been verified by the vapor pressure calculation.
성종국(Jong Kook Seong),최명준(Myung Jun Choi),우상길(Sang Gil Woo),백병산(Byung San Baek),허종성(Jong Sung Hur) 대한기계학회 2012 대한기계학회 춘추학술대회 Vol.2012 No.11
As the capacity of a transformer has been increased, the overheating by a magnetic field from high current is becoming one of the main issues of the transformer. To solve this problem, efficient cooling system design is needed. In this paper, the cooling capacity of the radiator was analyzed to improve the cooling performance for an oil immersed transformer. The heat transfer rates depending on the radiator and the number of the fin were obtained by using numerical simulation method. From this analysis, we proposed an efficient cooling system for the transformer. And the effectiveness of the proposed analysis method was verified by comparing with the temperature rise test.