• Proceedings of the Korean Vacuum Society Conference
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• 2016.02a
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• pp.402.2-402.2
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• 2016

In photoelectrochemical (PEC) water splitting, Cu2ZnSnS4 (CZTS) compound has attracted intense attention as a photocathode due to not only large optical absorption coefficient, but also earth-abundance of constituent elements and suitable band alignment. With rapid development of nanotechnology, one-dimensional nanostructures of CZTS have been investigated as a potential form to achieve high efficiency because the nanostructures are expected to be capable of capturing more light and enhancing charge separation and transport. Here, we report a well-controlled fabrication route for vertically-aligned CZTS nanorod arrays on anodic aluminium oxide (AAO) template via simple sol-gel process followed by deposition of ZnS or CdS buffer layers on the CZTS nanorod to enhance charge separation. The structure, morphology, composition, optical absorption, and PEC properties of the resulting CZTS nanorod samples were characterized using X-ray diffraction, Raman spectroscopy, transmission electron microscopy, energy dispersive X-ray spectrometry, scanning electron microscopy, and UV-vis spectroscopy.

• Transactions of the Korean Society of Mechanical Engineers
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• v.17 no.5
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• pp.1246-1252
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• 1993

Coal-Water slurry (CWS) is a new potential form of fuel for use in power plants and industrial furnaces. The evaporation and ignition characteristics of CWS have been studied in the post-flame region generated by a flat flame burner. Individual droplets with initial diameters of 1-3mm were supported around the thermocouples and raidly exposed to a hot gas stream. The gas temperature ranged between $950^{\circ}C$ and 1600.deg. C at atmospheric pressure. The effect of droplet size, gas temperature and radiative heat transfer by screen were studied experimentally. The ignition criterion was either a rapid temperature rise in time-temperatuire curves or onset of visible flame in experiment. Incresing the gas temperature or decreasing the droplet size reduced the time required for evaporation and ignition.

• 한국생물공학회:학술대회논문집
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• 2001.11a
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• pp.578-581
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• 2001

A treatability study was conducted using a hydrocarbon-contaminated soil for the oPtimization of bioremediation strategy best fit to a given set of contamination. The applicability of nutrients, biosurfactant, and oil-degrading microorganisms were examined by monitoring $CO_2$ evolution and oil degradation The addition of inorganic nutrients in the form of slow released fertilizer accelerated the initial rate of $CO_2$ evolution by a factor of 3. The application of oil-degrading microorganisms did not significantly increased $CO_2$ evolution or biodegradation efficiency. Application of a commercial biosurfactant was most effect in terms of the total $CO_2$ evolution and the oil degradation rate. The results indicate that $CO_2$ evolution measurement was found to be a simple and reliable countermeasure of crude oil hydrocarbon mineralization for the rapid determination of the best-fit bioremediation strategy.

• 한국생물공학회:학술대회논문집
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• 2003.10a
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• pp.521-524
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• 2003

An effective purification method was developed for producing Homoharringtonine (HHT), to guarantee high purity and yield from Cephalotaxus koreana. This process was a simple and efficient procedure, for the isolation and purification of HHT form the biomass of Cephalotaxus koreana, consisting of extract, adsorbent treatment, precipitation and followed by a chromatography. The extraction, adsorbent treatment and precipitation in pre-purification process allows for rapid and efficient separation of HHT from many compound and dramatically increases the yield and purity of crude HHT for HPLC purification steps compared to alternative processes. This purification processes serves to minimize solvent usage, size, and complexity of the operations for HHT purification.

• Culinary science and hospitality research
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• v.6 no.2
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• pp.199-225
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• 2000

It is desirable that the management of human resources, as a strategy for the competition, should be the necessity for the hotel industries to survive in the rapid change and continuous development In other words, the management of enterprise provides the foundation to form human relationship, just as the hospitality industry operates with human relationship. Here by, all the problems out hotels have faced are that our hotels should look for a new human resources. The control of human resources in hotels means that if does not only satisfy hotels, employees, and guests but improves the personal ability. also it is important for the method of hotel operation as a management. Therefor, hotel managers have to get a good human resources, at the same time, improve the potential ability from them in order to get development for industries and a person. This study in the effective project for the human resources in hotels is relation to the organization of hotel sand he factor of human resources. This research if focused on the property of classification each factor in the control of human resources. according to the classification, the relationship and an effect are commonly made in groups of properties and are named respectively.

• Journal of the Korean institute of surface engineering
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• v.28 no.2
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• pp.67-76
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• 1995

The microstructure of 95wt.%Pb/5wt.%Sn and 63wt.%Sn/37wt.%Pb solders for flip chip bonding process has been characterized. Solders were deposited by thermal evaporation and reflowed in the conventional furnace or by rapid thermal annealing(RTA) process. As-deposited films show columnar structure. The microstructure of furnace cooled 63Sn/37Pb solder shows typical lamellar form, but that of RTA treated solder has the structure showing an uniform dispersion of Pb-rich phase in Sn matrix. The grain size of 95Pb/5Sn solder reflowed in the furnace is about $5\mu\textrm{m}$, but the grain size of RTA treated solder is too small to be observed. The microstructure in 63Sn/37Pb solder bump shows the segregation of Pb phase in the Sn rich matrix regardless of reflowing method. The 63Sn/37Pb solder bump formed by RTA process shows more uniform microstructure. These result are related to the heat dissipation in the solder bump.

• International Commerce and Information Review
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• v.5 no.2
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• pp.135-156
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• 2003

With the increasing recognition of logistics as a source of potential competitive advantage by companies, there has been a rapid growth in the logistics service industry. In particular increased globalization by multinational corporations has prompted consideration of outsourcing logistics service to third party logistics firms. This paper aims to seek the way to establish logistics information system by the case study of company 'D'. The G-Project, aiming to establish global supply chain including information network was required to form integrated logistics information system between manufacturer and logistics provider. The results should have considerable value to both global manufacturers and logistics providers.

• Journal of Korea Game Society
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• v.2 no.1
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• pp.36-41
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• 2002

Recently, The online role playing games (RPG) get into spotlight of worldwide game marketing area because of the rapid growth of high speed Internet environment during a decade. The almost online RPGs are made of campaign scenario that constructed in series. In this paper, we propose the Distributed Server Model for the Evolutionary Online RPGs which have series scenario (Campaign). In order to represents evolutionary online RPGs, We configure the online RPG server uniquely by means of one to one mapping between logical and physical game world. We also configure the game worlds using circular queue form to express the evolution of civilization by reconstruction of game world.

• Korean Journal of Health Education and Promotion
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• v.8 no.1
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• pp.14-21
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• 1991

In accordance with the rapid industrialization in Korea, there have been remarkable changes in the health environment. The major changes are ; the change of disease structure, the aging of population structure, the diversification of health needs and the increase of health care costs. Because most of health problems stems from the environment, national health policy should be conducted according to the environmental changes. It is necessary for the voluntary organizations as well as the government ones to plan and participate the national health promotion movement on a national level so as to make the people form the attitude that health promotion is better than cure. Also, it is desirable that national health promotion movement be implemented gradually especially by four steps, 1) preparation step; 2) enlightenment step: 3) implementation step: 4) evaluation step.

• Applied Microscopy
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• v.24 no.1
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• pp.114-122
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• 1994

Drastic changes were observed in egg chamber during oogenesis of Aedes togoi immediately after blood meal. The egg chamber, in which the oocyte remains at previtellogenic stage before blood meal, shows very little change in size even for 3 days after emergence but increased 25 folds in volume within 60 hours after blood meal, presumably due to rapid yolk formation. Upto 6 hours after blood meal structures considered to be the precursor of the yolk granules were not observed in the space between follicle cells and oocyte. Vitelline bodies, which are similar to dense bodies secreted from follicle cells, appeared in the space at 10 hours after blood meal. Although vitelline bodies were fused to form vitelline layer, these bodies seem to contribute to the formation of yolk granules. Nurse cells are connected to oocytes by cytoplasmic bridge before blood meal, but the cells are absorbed into oocyte at 6 hours after blood meal.