• 한국토양비료학회지
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• 제9권1호
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• pp.57-63
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• 1976

The lecturer pointed the agriculture in change brought about population bomb and economic development, and he appealed the scientists of soil and fertilizer to make proposals for establishing their constructive attitudes toward the situations of agriculture. The points emphasised by the lecturer for the improvement of future food situation were: fox example the elucidation of the ancient agricultural technology of Korea which is a important attempt for development of agricultural technology of Korea and Japan, and soil improvement with special attention to the efficiencies of phosphate, silicate, cations and trace elements. He showed some Japanese examples of natural pollution as both of a sufferer and an assailant of agriculture which are resulted from the high economic development, and some methods of solution, for example active application of legumes capable for fixing atmospheric nitrogen to wasted soils. He also pointed the need of lower consumption of energy and resources, and new understanding of wild plant species for the future agriculture. Some methods of other fields of sciences were emphasised for developing the soil and fertilizer researches.

• East Asian mathematical journal
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• 제32권4호
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• pp.443-464
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• 2016

The purpose of ths study is to compare and analyze the sequence of teaching multiplication facts in the elementary school mathematics. Generally, the multiplication in the elementary school mathematics is composed of the followings; concepts of multiplication, situations involving multiplication, didactical models for multiplication, and multiplication strategies for teaching multiplication facts. This study is focusing to multiplication facts, especially to the sequence of teaching and multiplication strategies. The method of this study is a comparative and analytic method. In order to compare textbooks, we select the Korean elementary mathematics textbooks(1st curriculum~2009 revised curriculum) and the 9 foreign elementary mathematics textbooks(Japan, China, Germany, Finland, Hongkong etc.). As results of comparative investigation, the sequence of teaching multiplication facts is reconsidered on a basis of elementary students' mathematical thinking. And the connectivity of multiplication facts is strengthened in comparison with the foreign elementary mathematics textbooks. Finally multiplication strategies for teaching multiplication facts are discussed for more understanding and reasoning the principles of multiplication facts in the elementary school mathematics.

• 비교문화연구
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• 제48권
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• pp.1-30
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• 2017

본 연구는 일본에서 저술된 한국고전문학사를 중심으로 일본문학사와 남북한 문학사와의 문화횡단적 양상을 살핌으로써 한국문학사에 대한 인식과 서술양상을 규명하고자 했다. 그 분석대상은 일본인과 재일조선인을 대상으로 일본어판 "조선문학사"를 저술한 김동욱과 변재수이다. 일본문학과의 비교문학적 관점인 김동욱의 "조선문학사"(1974)와 재일조총련계로서 사회주의적 관점에서 저술한 변재수의 "조선문학사"(1985)는 자국문학사의 가치를 평가하는 기준과 인식이 서로 달랐다. 이것은 무엇보다 분단체제로 인한 남북한의 문학사가 이질적으로 전개되는 현실에서 그들의 "조선문학사"는 남북문학사의 균열상을 담아내고 있다. 하지만 그 한편으로 한문문학의 가치와 향가, 한글창제, 그리고 판소리의 독자성을 높이 평가하고 있으며, 한국문학으로서 한글문학과 한문문학이 서로 상호작용 했다는 것을 증명하고 있다는 점은 공통적이다. 뿐만 아니라 그들의 일본어판 "조선문학사"의 저술의의는 민족주의적 시각하에 일반적으로 한국문학을 중국문학의 아류라는 인식에서 벗어나 한국문학의 가치를 재정립시키고, 일본인에게는 한국문학의 우수성을 재일동포에게는 민족적 자긍심을 고취시키기 위한 노력이었다는 것을 확인할 수 있었다.

• 천문학논총
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• 제27권4호
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• pp.223-224
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• 2012

Understanding the birth and evolution of galaxies, and the history of star formation in them, is one of the most important problems in astronomy. Using the data from the AKARI IRC survey of the Large Magellanic Cloud at 3.2, 7, 11, 15, and $24{\mu}m$, we have constructed a multi-wavelength catalog containing data from the cross-correlation with a number of other databases at different wavelengths. We present the first approach with a Support Vector Machine (SVM)-based method to separate different classes of stars in LMC in the color-color and color-magnitude diagrams.

• 무역상무연구
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• 제54권
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• pp.285-307
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• 2012

This study analyses the transformation of Asian steel trade and the change of corporate strategy. The purpose of this paper is to examine the circumstances of Asian steel industrial policies, and considering the feature of each nation's steel industrial policies, and the effect of the corporate strategy. In China, mighty steel productive capacity had already formed under original planned economy and industrial policy. In 2003, crude steel production have exceeded 220 million ton in China and that is 23.2% of the steel production share in the world. On the other hand, not only the amount but also the quality becomes an important point in the steel industry in the future. I consider, on researching Asian steel industry, it is important to build up partnership in Korea and Japan for achieve strategic alliance in the steel industry policies and understanding the change of corporate strategy.

• 한국기계기술학회지
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• 제13권4호
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• pp.149-156
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• 2011

In case of domestic pyrolysis dry distillation gassification technology, it stays at the stage of its early introduction and development. Moreover, the companies possessed of this technology are limited to Japan and some countries in Europe, and domestic operative performance of this system is nominal, so there exist a lot of difficulties in securing its basic data. In addition, considering its operation and management, there happens a corrosion of metals by the production of corrosive gases in time of combustion of waste, and there arise a problem of occurrence of low temperature corrosion on exterior casing or gas ducts of a combustion chamber due to the high temperature corrosion around the burner of an incinerator, lowering the durability of an incinerator. Therefore, this study looked at the problems arising in time of incineration by understanding the characteristics of the pyrolysis dry distillation gassification incinerating facility, and did research on the improvement plan for durability of an incinerator for more economic, efficient waste incineration.

• 천문학회보
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• 제36권1호
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• pp.84.2-84.2
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• 2011

Astrophysical jets play important roles in many interesting astronomical phenomena, such as star formation, gamma-ray bursts, and active galactic nuclei. The jets are thought to be driven by rotating disks through magneto-centrifugal processes. However, quantitative understanding of the jet-driving mechanism has been difficult because examples showing rotation in both disk and jet are rare. One of the important quantities in the models of jet engine is the size of the jet-launching region. The bipolar jet of the NGC 1333 IRAS 4A2 protostar shows a lateral velocity gradient, which suggests that the SiO jet is rotating around its axis. The jet rotation is consistent with the rotation of the accretion disk. The disk-jet rotation kinematics suggests that the jet-launching region on the disk, or the outflow foot-ring, has a radius of about 2 AU, which supports the disk-wind models.

• 천문학회보
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• 제35권2호
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• pp.66.1-66.1
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• 2010

Mass is one of the most fundamental quantities of a stellar object, and direct estimations of mass from the rotation kinematics of circumstellar disk are important in understanding the evolution of young stellar objects. We present our observations of the NGC 1333 IRAS 4A2 protostar in the ammonia lines. The emission structure was interpreted as a circumstellar disk around the protostar. The disk has a Keplerian-like rotation curve, and we derived the mass of the protostar. The mass, accretion rate, and age are consistent with what are expected from the standard theory of low-mass star formation.

• Nuclear Engineering and Technology
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• 제48권1호
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• pp.26-32
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• 2016

Research and development (R&D) methodology for the practical use of accident tolerant fuel (ATF) in commercial light water reactors is discussed in the present review. The identification and quantification of the R&D-metrics and the attribute of candidate ATF-concepts, recognition of the gap between the present R&D status and the targeted practical use, prioritization of the R&D, and technology screening schemes are important for achieving a common understanding on technology screening process among stakeholders in the near term and in developing an efficient R&D track toward practical use. Technology readiness levels and attribute guides are considered to be proper indices for these evaluations. In the midterm, the selected ATF-concepts will be developed toward the technology readiness level-5, at which stage the performance of the prototype fuel rods and the practicality of industrial scale fuel manufacturing will be verified and validated. Regarding the screened-out concepts, which are recognized to have attractive potentials, the fundamental R&D should be continued in the midterm to find ways of addressing showstoppers.

• 한국환경과학회지
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• 제7권3호
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• pp.291-300
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• 1998

Recently, upwelling of anoxic bottom water mass have been frequently observed in northeast part of Tokyo Bay in Japan during summer to autumn. Since the colour of water surface becomes milkyblue or milkygeen, the upwelling phenomenon Is called 'Blue Tide'. The data analysis of field surveys during 'Blue Tide' appearance have been performed for understanding the physical features of the 'Blue Tide' phenomena In Tokyo Bay. It becomes clear that (1) the formation of the anoxic bottom water correlates well with the temperature difference between the surface and bottom waters, (21 there are two necessary conditions for generating 'Blue Tide': that Is, strong stratincation and off-shore wind. The strong southwest(on-shored wand before the 'Blue Tide' appearance may play an iniportant role to make the striancation strengthen. When these conditions are larger and the northeast or east-northeast (off-shored wind stronger than S ifs blows In succession, the 'Blue Tide' upwelling appears at the head of Tokyo Bay.