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B.K. KIM(金鳳九),K.W. CHUNG(鄭吉雄),J.C. CHAE(蔡濟天),J.J. HWANG(黃鐘辰) 한국육종학회 1982 한국육종학회지 Vol.14 No.3
To establish a simple method for testing varieties for aluminum tolerance and to screen the acid tolerant varieties, fifty wheat varieties and lines were grown in the experimental case with nutrient solutions containing the different Al concentration and days after 3~4 days at 20℃. The results showed that varietal differences were greatest in the nutrient solutions containing 0.6/mM Al and days after 3~4 days transplanted with sprouted seeds, and Atlas 66, Chokwang, Geurumil, Suweon 205, Naemil, Suweon 185, Suweon 89, and Changkwang were Al-tolerant.
화학당량에 따른 우라니아의 핵분열 기체 확산 계수 측정
김희문(H. Kim),박광헌(K. Park),김봉구(B. G. Kim),주용선(Y. S. Choo),김건식(K. S. Kim),송근우(K.W. Song),홍권표(K. P. Hong),강영환(Y. H. Kang) 한국표면공학회 2002 한국표면공학회지 Vol.36 No.1
The diffusion coefficient of Xe-133 was obtained from an annealing test. The specimens were made from a UO₂ single crystal powder with natural enrichment. Weight and grain size were 300mg and 23(㎛, respectively. Oxygen potentials were obtained from an oxygen sensor. Released fractions were obtained from both results of gamma scans and quantitative analysis with MCNP code, The annealing test was performed at three temperatures at once. Diffusion coefficients of Xe-133 were calculated using slope of Booth theory in each O/M ratios. Activation energy and the pre-exponential factor of the diffusion coefficient were obtained. The activation energy of near stoichiomeric UO₂ is 310 kJ/mol. The measured values of near stoichiometric UO₂ are very close to other data available. Diffusion coefficients increase with hyper-stoichiometry, due to higher concentration of cation vacancies.
CHO C.H(曺章煥),B.K. KIM(金鳳九),B.H. HONG(洪丙憙),J.H. NAM(南重鉉),K.W. CHUNG(鄭吉雄) 한국육종학회 1981 한국육종학회지 Vol.13 No.1
This study was subjected to clarify the physiological factors associated with heading and maturing of wheat and their genetic studies, relationship among heading time and involved factors as well as selection efficiency to serve for improvement of early maturing and high yielding wheat varieties. The results obtained to the present time were summarized as followings. 1. Physiological factors associated with heading time of wheat can be represented by growth habit, photowresponses, especially heading response to high temperature-shortday response, earliness in narrow sense and winter hardiness. In the areas where cold damage is negligible three factors except winter hardiness would be the major factors associated with heading time. Determination of growth habit was possible by growing materials at high temperature and longday condition with different vernalization periods. Photo-responses could be determined under high temperature-shortday and earliness in narrow sense under high temperature-longday. 2. Spring growth habit is controlled by four major genes Vrn₁, Vrn₂, Vrn₃ and Vrn₄. These genes are dominant over winter growth habit and Vrnl is found to be epistasis to the other Vrn genes. Winter growth habit is recovered. 3. Photo-insensitivity and earliness in narrow sense are controlled by one or two major genes in some crosses while polygenic inheritance are also observed in some. crosses. 4. Winter hardiness is quantitatively inherited, thus controlled by many genes 5. Studies on the earliness with segregating material planted in the field proved that this trait is determined by one or two major gene(s). However, in some crosses it was found to be polygenic. 6. Field heading time and photo-responses, earliness in narrow sense and growth habit were highly correlated each other but winter hardiness exhibited negative relations with field heading time and involved physiological factors. Thus, winter susceptibility was a disadvantageous trait for improvement of early maturing varieties. 7. Heritabilities estimated for heading time was considerably high regardless growing conditions. However, highest heritability was estimated for the materials grown under high temperature and shortday condition. 8. In relationship between heading time and grain yield, early maturing lines frequently damaged, particularly young spike primordia, by low spring temperature and increased sterile spikelet it will be desired to recombine some degree of winter growth habit, low temperature adaptability and photo-insensitivity. High grain weight and grain plumpness should also be considered in selection procedure for improving early maturing wheat varieties.
최명환(Choi, M.H.),주기남(Choo, K.N.),조만순(Cho, M.S.),김봉구(Kim, B.G.) 한국소음진동공학회 2005 한국소음진동공학회 논문집 Vol.15 No.12
The bottom structure of an instrumented capsule is a part which is joined at the receptacle of the flow tube in the reactor in-core. A geometrical change of the bottom structure has an effect on the pressure drop and the vibration of the capsule. The out-pile test to evaluate the structural integrity of the material capsule called 04M-17U was performed by using a single channel and a half core test loop. From the pressure drop test, the optimized diameter of the cone shape's bottom structure which satisfies HANARO's flow requirement (19.6 kg/s) is 71 mm. The maximum displacement of the capsule measured at the half core test loop is lower than 1.0 mm. From the analysis results, it is found that the test hole will not be interfered with near the flow tubes because its displacement due to the cooling water is very small at 0.072 mm. The fundamental frequency of the capsule under water is 9.64 Hz. It is expected that the resonance between the capsule and the fluid flow due to the cooling water in HANARO's in-core will not occur. Also, the new bottom structure of a solid cone shape with 71 mm in diameter will be applicable to the material and special capsules in the future.
원추형 하단부 구조를 갖는 캡슐의 하나로와의 양립성시험
최명환(M.H. Choi),조만순(M.S. Cho),주기남(K.N Choo),박승재(S.J. Park),김봉구(B.G. Kim),강영환(Y.H. Kang) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
The design modification of bottom guide structures of the instrumented capsule, which is used for the irradiation test in the HANARO reactor, was required because of the trouble of the bottom guide arm's pin during irradiation. The previous structure with 3-pin arms was changed into the cone shape of one body. The specimens of the bottom end cap ring with three different sizes (φ68/70/72mm) were designed and manufactured. The out-pile tests for the capsule with previous and new three bottom guide structures were performed in the one-channel flow test facilities. In order to evaluate the compatibility with HANARO and the structural integrity of the capsule, a loading/unloading, a pressure drop, a thermal performance, a vibration, and an endurance test were conducted. From out-pile test results, the capsule with the cone shape bottom guide structures was found to be more stable than the previous structure and the optimized size of the bottom guide structure selected was 70mm in diameter. It is expected that the new bottom guide structures will be applicable to all material and special capsules which will be designed and manufactured for the irradiation tests in the future.
J.H. NAM(南重鉉),C.H. CHO(曺章煥),B.H. HONG(洪丙惠),B.K. KIM(金鳳九) 한국육종학회 1982 한국육종학회지 Vol.14 No.3
This experiment for evaluation method of winter hardiness, relationship among the winter hardiness related traits and their relations with heading time in wheat were carried out. The mean squares estimated among cultivar and heritabilities estimated were higher at 20cm high ridges than the 10cm high ridges. The rate of winter killed plant remarkably noticed and easier to identify the varietal differences at 20cm high ridges, The correlation coefficients estimated between winter hardiness related traits was highly positive, significance especially between winter killed tillers and plants were 0.8627**, -0.8238** at Suweon and Yeoncheon. Also, Correlation coefficients estimated among the heading time and winter killed leaves, tillers and plants were -0.2283**, -0.2820** and -0.3050, respectively. High ridge top seeded method for evaluation of winter hardiness were effective to distinguish its varietal differences and found to be the methods that can screen number of varieties and segregating materials.
최명환(M.H. Choi),강영환(Y.H. Kang),조만순(M.S. Cho),김봉구(B.G. Kim),손재민(J.M. Sohn),주기남(K.N. Choo) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
An instrumented capsule has been used for an irradiation test of various nuclear materials in the research reactor, high-flux advanced neutron application reactor, HANARO. In this study, in order to estimate the results of an irradiation test for the material capsule and to obtain the preliminary design data of the new conceptual capsule using a liquid thermal media, the thermal analysis is performed by using a 2D model for each cross section including specimens. As a result of the tests and analyses, the maximum temperature at the reactor power of 24㎿ is 255℃ for an irradiation test and 260℃ for an FE analysis in the middle stage of the capsule. Also, from the comparison of the results for the capsule with Al and LBE thermal media, it is found that the conceptual design of a LBE capsule will meet the test requirements for a high temperature irradiation of new materials in the HANARO reactor.
비육돈에 있어서 교배조합이 산육능력 및 육질에 미치는 효과
손용석,김병철,김봉구,홍기창 한국동물자원과학회 2001 한국축산학회지 Vol.43 No.2
High variability of important traits of meat quality such as lean meat content and proportion of valuable cuts is a major problem of meat producing pigs. This study was conducted to investigate the effect of the mating system on the fattening performance and meat quality and to apply it to the farm in practice. For the study, total of 240 samples were used to estimate the economic indices of daily gain, meat productivity and meat quality, wherein two blocks of four boarlines Hampshire, Duroc × Hampshire, Duroc, and Hampshire × Duroc were mated to sows of the Bowline LW × LR in a weaner-production-farm. The results of the study showed that the Hampshire breed had the highest benefits in other cross-combination breeds, therefore, there is a need to introduce more Hampshire pigs in the mating system to produce better terminal sirelines.