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RISS 인기검색어
- 검색키워드
- 저자 : 이준웅(Jun Wung Lee) (검색결과 18 건)
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이준웅,Lee, Jun-Wung 한국군사과학기술학회 2010 한국군사과학기술학회지 Vol.13 No.6
Hydrogen is the most abundant element in the universe. Although hydrogen can produce three times more energy than gasoline and seven times than coal, the most challenging problem in utilizing hydrogen as energy carrier is its storage problem. In contrast to the liquid hydrocarbon, hydrogen can not be stored or transported easily and safely because of its extremely low boiling point(21K). Recently scientists have made a tremendous achievement in storing hydrogen capacity in solid state materials such as carbon based and metal organic frameworks materials as well as metal hydrides. In this review the author reviewed the status of the hydrogen storage technologies in solid state, the advantages and disadvantages in each category of materials and the future prospects of hydrogen storage.
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이준웅,Lee, Jun-Wung 한국군사과학기술학회 2008 한국군사과학기술학회지 Vol.11 No.5
For the major scientific laboratories around the world, nanotechnology has been one of the key scientific issues since the end of the last millenium. The basic materials of this newly emerging technology are nanoparticles, which, in fact, have been used for many centuries. However, the physical properties of the particles were understood quite recently. In order to apply the new properties we have to protect and functionalize the surfaces of the particles, since without protection of the surfaces, nanoparticles grow themselves due to Ostwald Ripening. In this review, the author describes recent technical progress in the field of fuctionalization of various nanoparticles and their applications, so that readers can grasp the overall picture of this new technological field.
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이준웅,Lee, Jun-Wung 한국군사과학기술학회 2011 한국군사과학기술학회지 Vol.14 No.2
Mankind has just begun to recognize that the most crucial factor to achieve the sustainable society in the future is green technology. Most countries support the development of green technology to prevent catastrophes from global warming, mainly in the areas of reducing carbon dioxide from the atmosphere. However, most products we consume in everyday life are produced through chemical processes, and we often oversee the fact that the huge amount of waste and energy during these chemical processes will seriously influence our goal to achieve our future society sustainable. Thus the technologies to minimize the amount of disposed waste and energy consumption during chemical processes may be more important than to reduce the greenhouse gases. In this regard this review introduces the recent status of green chemistry and future prospects in order to help our chemists and engineers establish research projects based on the green chemistry principles.
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이준웅,Lee, Jun-Wung 한국군사과학기술학회 2012 한국군사과학기술학회지 Vol.15 No.4
Green Chemistry emerged at the end of 20th century, which aims the development of the technologies for the sustainable society at the molecular level. Most products we consume in everyday life are produced through chemical processes, and we often oversee the fact that huge amount of solvents are used and disposed. At the present time most solvents used in laboratories as well as industries are volatile organic compounds(VOC), which gives health and environmental problems. Therefore scientists are seeking new materials which have equivalent properties of VOCs as solvent, and at the same time gives no health and environmental problems. In this brief review, the author describes the present status of research and development activities of green solvent materials throughout research societies worldwide. At present the most attractive green solvent candidates are water, glycerol, supercritical carbon dioxide and ionic liquids. In order to give the pictures of these materials, the author tried to introduce the overall aspects of green solvents in various chemical reaction as well as catalytic roles.
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이준웅,Lee, Jun-Wung 한국군사과학기술학회 2009 한국군사과학기술학회지 Vol.12 No.6
Ever since gold was found, this element has fascinated human beings. It is stable in air, and is illuminating for several thousands years without changing its colors. Nanoparticles are the basic nanommaterials, and, particularly gold nanoparticles show unique properties which are not shown in bulk states. Scientists are trying to apply these new properties to catalysts, bioscience, optics, etc. Judging from the current research activities, one can envisage that gold nanoparticles can play a major role in opening a new era in diagnoses and treatment of diseases like cancers. However to apply the nanoparticles one must modify the surface of the nanoparticles in order to give the materials certain functionalities. It certainly is worth to review the current research status and challenges in the area of functional gold nanoparticles.
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김현수,박방삼,이준웅 ( Hyoun Soo Kim,Bang Sam Park,Jun Wung Lee ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.1
Using Mohr`s stress circle, a theoretical compression equation was derived which closely fit the compression stage of the granular bed. A new concept was conceived for the polymer bonded granule that when compressed during initial compression stage from bulk to granule volume negligible energy was consumed. This phenomenon was largely due to the viscoelastic behavior of the granule. Considering the granule volume as the real starting point of the bed compression, the following theoretical compression equation was derived; C_g=1-V/V_g=C_mbP/1+bP where, C_g is degree of volume reduction from granule volume, P is pressure, V is volume, V_g is granule volume, C_m and b are constants. The experimental results and the results from theoretical compression equation showed good agreement over the whole range of experimental condition and the compression constant C_m was found to be the same value as granule porosity.
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김현수,박방삼,이준웅 ( Hyoun Soo Kim,Bang Sam Park,Jun Wung Lee ) 한국화학공학회 1992 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.30 No.2
In situations where granules flocculated with polymeric binders were compressed, the applicability of the theoretical compression equation, which was previously derived considering the granule volume as the real starting point of the bed compression, was tested. The experimental results and the theoretical compression equation showed good agreement over the whole range of experimental conditions; variation of the type of binder, granule size, size distribution, L_o/D ratio and compression rate and the compression constant C_m was shown to be the same value as granule porosity.
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김성호,김정국,이준웅,Kim Sung-ho,Kim Jeong-kook,Lee Jun-wung 한국군사과학기술학회 2004 한국군사과학기술학회지 Vol.7 No.3
Internal blast performance test on developed explosives was carried out. Internal blast means a blast wave in closed chambers like tunnels, bunkers, operation center and chamber of ships. We used Anpa tunnel for our test facility. We performed two series of tests to measure internal blast of developed explosives. Three different kinds of cast PBXs, DXD-09, DXD-10, DXD-18, and conventional explosive, Tritonal, were used in our test. The explosives were cast as a charge of 108mm diameter in a plastic tube of a 3mm thickness. The length of charges 4ere adjusted as a weight 3kg. A melt-cast explosive, tritonal, was used as a reference. Pentolite booster was used. The cylindrical boosters have a 95mm diameter and 47.5mm height. The results showed that there may be some differences between the performances in the air blast tests and those in the internal blast tests. The results showed that DXD-10, the best performance in air blast tests, showed the poorest performance in internal blast among the explosives tested. On the other hand, DXD-18 showed exactly the opposite trend. This is probably due to the highest contents of aluminum and inert binder in DXD-18. DXD-18 has $38\;wt\;\%$ of aluminum and $17\;wt\;\%$ of inert binders.
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