개발도상국에 있어서 온라인 구매와 같은 B2C 전자상거래의 확산은 선진국에 비해 느리게 이루어지고 있다. 본 연구에서는 전자상거래에 대한 개발도상국의 정보기술 수용에 영향을 미치는 요인들을 실증적으로 분석하기 위하여, TAM 기반의 연구모형을 제시하고 그 가설들을 표본 데이터를 사용하여 검증하였다. 연구 결과, 명성이나 경험과 같은 선행 요인들은 선진국의 경우와 다른 양태로 기술 수용에 영향을 미친다는 점을 알 수 있었다. 이러한 연구 결과는 개발도상국

Estimation of mortality behavior of a industrial property are useful for calculating depreciation and making management decisions relating to property. The common methods of computing depreciation require an estimation of service life, and some methods ma

In an environment where manufacturing conditions such as product lines keep changing, manufacturing control systems need to be continually maintained and upgraded according to the change. This requires an effective system implementation methodology. In th

Fuzzy partition is a conceptual vehicle that encapsulates data into information granules. Fuzzy equalization concerns a process of building information granules that are semantically and experimentally meaningful. A few algorithms generating fuzzy partiti

The aim of this study was to examine the promoting effect of herbal extracts on hair regrowth in C3H/HeJ mice. The herbal extracts were obtained from the Damo-cosmetics Inc. There were four experimental groups including distilled water (D. W., negative control), 20% ethanol (EtOH, vehicle control), 3% minoxidil (MXD, positive control), and herbal extract (Ext). The herbal extract included the mixture of water and alcohol extract from Pleuropterus multflorus, Lonicera japonica Thunberg, Phellinus linteus, and Phaseolus radiatus. Test compounds were applied to the shaved dorsal skin of mice mouse for 3 weeks. The photograph of hair regrowth was taken at day 0, 4, 7, 10, 14, 17, and 21. The herbal extract group showed faster hair regrowth than negative control group or 20% EtOH groups after 10 and 14 days of treatments. The elongation of hair follicles in MXD and the herbal extract groups were observed. The activities of alkaline phosphatase (ALP) and γ-glutamyl transpeptidase were sfanificantly (γ-GT) increased in MXD and herbal extract groups compared with negative control group (p＜0.05). The expression of epidermal growth factor (EGF) and vascular endothelial growth factor (VEGF) were also sfanificantly hfaher in MXD and herbal extract group than negative control group (p＜0.05), althouah there were no sfanificant differences amoularhe groups of 20% EtOH, MXD, and herbal extract. These results suagest that the herbal extract used in this study may have grpromoting effect on hair regrowth by increasing activities of ALP and γ-GT and expression of EGF and VEGF.

Anti-wrinkle effect of herbal extracts was investigated on the skin of in a model of animal irradiated by ultraviolet rey B (UVB). The female albino hairless mice (HR/ICR) were randomly allocated to the normal control group (NC-non irradiated-vechicle), positive control group (PC, UVB irradiated vehicle) and herbal extract (HE) group. The herbal extract included the mixture of water and alcohol extract from Pleuropterus multflorus, Lonicera japonica Thunbert, Phellinus linteus, and Phaseolus radiatus. The herbal extract was treated dorsally with 0.2 ml per mouse five times a week for 12 weeks. At fifth week of the treatment, the animals were exposed to UVB irradiation for subsequent eight weeks three times a week. The intensity of irradiation was gradually increased from 30 mJ/㎠ to 240 mJ/㎠ (1MED: 60 mJ/㎠). Dorsal skins were obtained and stained with H&E to examine histological changes and epidermal/dermal thckness. The collagen fiber was also observed in Masson-Trichrome staining. Hydroxyproline assay and western blot analysis were also carried out to detect the change of collagen amount and to investigate MMP-1 expression, respectively. The HE group showed a better appearance and weak wrinkling, compared to PC group, The treatment of herbal extract significantly increased the thickness of dermis and the amount of collagen fibers compared to PC group (p＜0.05). The treatment of HE significantly increased the hydroxyproline amount compared to PC group (p＜0.05). The chronic UVB irradiation to hairless mice skin increased expression of MMP-1 but the treatment of HE decreased the expression of MMP-1. These results indicate that the herbal extract used in this study have a preventive effect on the UVB-induced wrinkle in a hairless mice model, partly due to the reduction of MMP-1 expression and increment of collagen amount.

전기전자 및 디스플레이 산업에 다양한 응용이 기대되는 전도성 고분자인 PPP(Polyparaphenylene)는 단순한 구조와 비교적 높은 열적 안정성을 가지고 있으나 전기적 특성은 기존의 물질보다 낮아 그 응용이 더디게 진행되고 있다. 본 연구에서는 전도성 고분자의 전기적 특성을 개선하기 위해 이온주입법을 이용하여 전기전도성을 개선하는 연구를 진행하였다. 5keV에서 30keV 정도의 아주 낮은 에너지를 이용하여 이온을 가속시킴으로서 시편의 특성 열화를 최소화 할 수 있었다. 이온주입법으로 개선된 시편의 전기전도성은 향후 OTFT와 같은 Organic Electronics Device로서의 사용 가능성을 보였으며 이온의 종류와 주입정도에 따라 Thermoelectric power의 크기가 달라지는 반도체 소재로서의 특성을 나타내어 향후 다양한 형태의 소자에 응용될 수 있는 가능성을 확인하였다. 실험으로 확인된 최적의 이온주입에너지는 10keV에서 15keV의 값을 나타내었다.

  The estimation of mortality characteristics of industrial property is an important adjunct to engineering valuation and depreciation estimation. Once the important of depreciation estimation is determined, it is desirable to understand the processes upo

  A POP system, which collects manufacturing data from the shop floors and supply them to higher level systems, should be maintained and upgraded according to the change of production environment such as new product introduction. This situation leads to t

A manufacturing information system, which collects manufacturing information from the shop floors and supply them to higher level systems, should be maintained and upgraded according to the change of production environment such as new product introduction. This situation leads to the need of a cost-effective system development methodology. In this paper, a methodology based on the classification and the similarity comparison of manufacturing processes is proposed. In this, a new product is classified according to the similarity of its manufacturing processes, which enables recycling of existing system modules. The proposed methodology has been tested in the case of an electronics parts manufacturing company, where an information system is implemented. The result shows that the proposed methodology can save time and efforts for system implementation

고층건물의 진동응답을 저감시키기 위한 다양한 방법들이 연구되고 있다. 이들 진동응답의 저감 연구는 건물의 외관을 병화 시키는 방법과 건물에 부가감쇠장치를 설치하는 방법들이 있는데 본 논문에서는 고층 건물의 형태의 변화에 다른 진동변위응답의 특성을 파악하고자 한다. 고층건물의 형태변화 중에서도 외관에 테이퍼를 수는 방법을 사용하였다. 기류의 특성은 도심 및 교외지역을 중심으로 풍동실험을 실시하였다.