• 한국물환경학회지
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• 제39권6호
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• pp.439-450
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• 2023

The Yeongsan River, a major water resource for Jeollanam-do, that is adjacent to industrial complexes and agricultural areas, is exposed to water pollution. Therefore, it is necessary to investigate the impact of water pollution incidences and prepare response systems for river environment safety for other water resources in the future. Environmental Fluid Dynamics Code (EFDC) was applied to the mainstream of the Yeongsan River where residential, commercial, and agricultural areas are located to analyze the behavior of pollutants conducting the scenario analysis. Considering the pollutants that affected the study area, two pollutants, oil and benzene, with different physical and chemical characteristics were selected for the analysis. As a result of comparing the actual and simulated values of the water elevation, temperature, and flow rate, it was confirmed that the model adequately reproduced the hydraulic characteristics of the Yeongsan River. The oil flow dynamics showed that an increase in flow rate led to reduction in the maximum height of the slick. Notably, the behavior of the oil was predominantly influenced by the wind conditions. In the case of benzene, lower flow scenarios exhibited decreased arrival times and residence times accompanied by an elevation in the maximum concentration levels. From the results of pollutant behavior in the study area, it is feasible to utilize the section of tributary confluence for collection and the weir area for dilution. This study enhances the understanding of the pollutant's behavior with different characteristics and develops effective control systems tailored to the physicochemical attributes of pollutants.

• Journal of Korean Society for Atmospheric Environment
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• 제19권E1호
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• pp.21-28
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• 2003

An auxiliary device, called Post Cyclone (PoC). had been introduced and primarily examined in earlier works which proved the reduction of the emission of fine dust from the gas-solid cyclones without incurring significant increase of cost and pressure drop. It has been known that the PoC has some advantages over other secondary dust treatment devices such as (a) simple design, (b) low cost of manufacture, (c) minimum additional pressure drop, (d) high recoverbility of the product dust, and (e) simplicity of operation. Despite the potential advantage, however, lack of practical data confined its plausible application in wide areas. Thus, in this work, a few serial experiments were conducted in terms of a few operation conditions, and the particle trajectories throughout the cyclone set-up were visually analyzed by using a commercial computer simulation program (FLUENT).

• Carbon letters
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• 제14권2호
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• pp.117-120
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• 2013

In this study, an electro-catalyst of Pt nanoparticles supported by polypyrrole-functionalized graphene (Pt/PPy-reduced graphene oxide [RGO]) is reported. The Pt nanoparticles are deposited on the PPy-RGO composite by chemical reduction of H2PtCl6 using NaBH4. The presence of graphene (RGO) caused higher activity. This might have been due to increased electro-chemically accessible surface areas, increased electronic conductivity, and easier charge-transfer at polymer-electrolyte interfaces, allowing higher dispersion and utilization of the deposited Pt nano-particles. Microstructure, morphology and crystallinity of the synthesized materials were investigated using X-ray diffraction and transmission electron microscopy. The results showed successful deposition of Pt nano-particles, with crystallite size of about 2.7 nm, on the PPy-RGO support film. Catalytic activity for methanol electro-oxidation in fuel cells was investigated using cyclic voltammetry. The fundamental electrochemical test results indicated that the electro-catalytic activity, for methanol oxidation, of the Pt/PPy-RGO combination was much better than for commercial catalyst.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2008년도 추계학술발표대회 논문집
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• pp.155-160
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• 2008

Recently, curtainwall is built according to expand residential-commercial complex and high-raised buildings in residential buildings. It is that curtainwall has advantage to provide for the building occupants a connection between indoor spaces and the outdoors through the introduction of daylight and views into the regularly occupied areas of the building. These buildings also make a result increasing the amount used energy in domestic residence. Therefore, Aims of this study is to suggest advanced design through analysis of daylight, energy and envelope elements in GBCC and glazing simulation depended on case studies.

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2010년도 하계학술대회 논문집
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• pp.115-115
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• 2010

This paper introduces a measurement system that measures behavior and electrical characteristics of overhead contact line irregular sections in real-time. For verification, we developed a prototype of the real-time overhead contact line irregular section behavior measurement system and a monitoring system for field tests. The current and temperature of contact wires and messenger wires were measured real-time by applying the system at KTX a commercial line. Therefore, acquiring data is possible with the developed system and this system that measures one of the fundamental and key factors, the catenary current, should be applicable to various areas such as detecting characteristics for designing overhead contact lines, enhancing speed, and enhancing energy.

• 유통과학연구
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• 제12권5호
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• pp.33-40
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• 2014

Purpose - This paper aims to review cold chain management, especially in the pharmaceutical industry, to explore the cold chain process of delivering temperature-sensitive pharmaceutical products, and to identify areas for further development. Research design, data, and methodology - The paper, based on literature review and corporate analysis, reviews the development and status of the cold supply chain system, including its important role in the pharmaceutical industry. Results - Logistics in this field requires more stages than are typically needed. Due to the unique characteristics of the market, few companies can provide the services; currently, only few global companies with large networks and high technologies can afford to do so. Expanding pharmaceutical markets to meet global demand will require cold chain development, especially in "pharmerging" markets. Conclusions - Cold chain is a highly sensitive market in terms of products being carried within the chain that itself is a complex system. However, at the same time, it is a niche market with new opportunities. Hence, a sound cold chain infrastructure is needed to satisfy companies, governments, and customers for both commercial and public reasons.

• International Journal of CAD/CAM
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• 제2권1호
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• pp.55-67
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• 2002

In many areas of industry, it is desirable to have fast and reliable systems in order to quickly obtain suitable solid models for computer- aided analyses. Nevertheless it is well known that the data exchange process between CAD modelers and CAE packages can require significative efforts. This paper presents an approach for geometrical data exchange through triangulated boundary models. The proposed framework is founded on the use of STL file specification as neutral format file. This work is principally focused on data exchange among CAD modelers and FEA packages via STL. The proposed approach involves the definition of a topological structure suitable for the STL representation and the development of algorithms for topology and geometry data processing in order to get a solid model suitable for finite element analysis or other computer aided engineering purposes. Different algorithms for model processing are considered and their pros and cons are discussed. As a case study, a prototype modeler which supports an exporting filter for a commercial CAE package has been implemented.

• 한국전자거래학회지
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• 제5권2호
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• pp.1-25
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• 2000

The utilization of Internet, which started only at the level of advertisement, has been gradually expanding its application areas as the trial commercial transaction becomes successful, the password-coding technology which removes the risks on the cyber transaction develops, the electronic money appears and other various related technologies progress. Following this trend the securities industry has been experiencing changes along with efforts to use it commercially. This study is to analyze the work of cyber securities companies on the basis of the theoretical background through preceding studies and literature and also analyze the common and different reasons for superiority-securing strategy in competition along with problems and their reasons. And also the objective of this study is to offer new superiority-securing strategy in competition and problem-solving strategy.

• 한국데이타베이스학회:학술대회논문집
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• 한국데이타베이스학회 2000년도 추계학술대회 E-Business와 정보보안
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• pp.289-296
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• 2000

The utilization of Internet, which started only at the level of advertisement, has been gradually expanding its application areas as the trial commercial transaction becomes successful, the password-coding technology which removes the risks on the cyber transaction develops, the electronic money appears and other various related technologies progress. Following this trend the securities industry has been experiencing changes along with efforts to use it commercially. This study is to analyze the work of cyber securities companies on the basis of the theoretical background through preceding studies and literature and also analyze the common and different reasons for superiority-securing strategy in competition along with problems and their reasons. And also the objective of this study is to offer new superiority-securing strategy in competition and problem-solving strategy.

• 농촌계획
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• 제4권2호
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• pp.79-88
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• 1998

The purpose of this study was to identify factors related to residential satisfaction, and to examine the rural housing and village environment which enable to derive what should be considered in the future rural housing improvement. Data were collected by questionnaire survey in 11 rural villages - suburban rural area, plain rural area, intermediate rural area, mountainous rural area. The major findings are as follows: 1) The rural residents rather dissatisfied with'management/maintenance','economic value','facade'in housing level, The overall housing satisfaction level was just medium(neither satisfied nordissatisfied). 2) They also dissatisfied with'playground for children','education condition','medical facilities', 'market'in village level. The overa'll village satisfaction level was just above average(slightly satisfied). 3) Vrom the result of ANOVA test, there are no significant differences in residents evaluation for tiousing and village attributes among 4 rural areas. 4) Factor analysis identified six rural housing environmental factors:'inside utilities','housing size' 'aesthetic aspects','safety','privacy','outside utilities'. 5) For the rural village environments six important factors were derived :'public services','commercial convenience facilities','social interaction','environmental pollution','amenity','agricultural service facilities'.