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Sang-Hwan Ryu,Byeoung-Soo Yum,Won-Mo Gal 한국유통과학회 2018 The Journal of Industrial Distribution & Business( Vol.9 No.10
Purpose - This thesis is to develop a management plan and checklist by analyzing the prevention of accidents in advance by presenting the management plan for the major causes of railway accidents. Research design, data and methodology - In recent 5 years, we have analyzed the cases of railway accident, presented the management plan for the accident, and made a practical safety checklist focusing on the main measures according to the management plan. Results - The analysis of the cases of near-railway accidents suggests more concrete and practical safety management measures because the similar accidents are continuously occurring due to formal safety management. Conclusions - It is more valuable to apply to the adjacent construction of the railway line by creating a detailed checklist based on cases rather than the existing checklist. This study is written only as a human factor. For future real - time safety management, it is necessary to study more precisely cause analysis and safety equipment as a big data - based safety control system for more systematic safety management.
Innovation Resistance In a Smart Phone Environment : A Technology Acceptance Model Approach
Shin, Min-Soo,Yum, Ji-Hwan Korea Data Strategy Society 2011 Journal of information technology applications & m Vol.18 No.4
The study developed the ideas of innovation resistance attitude in view of innovation delay, rejection, and objection. Authors developed the idea of innovation resistance attitudes of customers in view of innovation diffusion process. The study categorized the idea of resistance such as delay, rejection, and objection. The study hired the structural equation modeling to evaluate the relationships among the consumers' subjective variables such as incongruence, uncertainty, perceived performance, peer usage, and tradition orientation those were factored out by the survey test. These measured variables were analyzed into the innovation resistance related latent variables. The study provides the basic treatment to introduce new technologies and products to the superficially resisting customers. Those resisting customers might be future late adopters. The research results provide the basic arguments for prerequisite treatment to introduce smart phone in the global market place.
Jae-Kwang Yum,Jin-Hyok Kim,Kyung-Hwan Boo,Soo-Hyung Ahn 대한견주관절의학회 2015 대한견주관절의학회지 Vol.18 No.4
Background: We investigated the effectiveness of pain management and the adverse events of intravenous (IV) patient-controlled analgesia (PCA) after orthopedic surgery. Methods: From September 2014 and August 2015, we performed a retrospective analysis of 77 patients who underwent orthopedic surgery of the shoulder or the elbow in our hospital. The composition of the intravenous PCA administered to the patients was as follows: 250 mg of dexketoprofen trametamol, 70 mg of oxycodone, and 0.6 mg of ramosetron, which were made up to 79 ml of normal saline. We evaluated and statistically analyzed the difference in the visual analogue scale (VAS) scores for pain at immediate postoperation, at 24 hours of PCA, at 72 hours of PCA, and after discontinuation of PCA and in the incidence of adverse events. Results: We found that VAS score decreased for 3 postoperative days and that with discontinuation of IV PCA a meaningful change in VAS score was no longer seen. Of the 77 patients, 22 presented with adverse events (28.6%). We terminated IV PCA temporarily in the 21 patients who presented with adverse events; we terminated analgesia permanently in one patient (1.2%). Consequently, 76 of 77 patients carried out IV PCA till the designated period. Conclusions: Intravenous PCA after orthopedic surgery of the shoulder or the elbow may be accompanied with adverse events. Careful assessment of the patient and treatment of the adverse outcomes are key to a successful maintenance of PCA and to a successful management of postoperative pain.
Effects of aerosol on evaporation, freezing and precipitation in a multiple cloud system
Lee, Seoung Soo,Kim, Byung-Gon,Yum, Seong Soo,Seo, Kyong-Hwan,Jung, Chang-Hoon,Um, Jun Shik,Li, Zhanqing,Hong, JinKyu,Chang, Ki-Ho,Jeong, Jin-Yim Springer-Verlag 2017 Climate dynamics Vol.48 No.3
<P>Aerosol effects on clouds and precipitation account for a large portion of uncertainties in the prediction of the future course of global hydrologic circulations and climate. As a process of a better understanding of interactions between aerosol, clouds and precipitation, simulations are performed for a mixed-phase convective multiple-cloud system over the tropics. Studies on single-cloud systems have shown that aerosol-induced increases in freezing, associated increases in parcel buoyancy and thus the intensity of clouds (or updrafts) are a main mechanism which controls aerosol-cloud-precipitation interactions in convective clouds. However, in the multiple-cloud system that plays much more important roles in global hydrologic circulations and thus climate than single-cloud systems, aerosol effects on condensation play the most important role in aerosol-induced changes in the intensity of clouds and the effects on freezing play a negligible role in those changes. Aerosol-induced enhancement in evaporation intensifies gust fronts and increases the number of subsequently developing clouds, which leads to the substantial increases in condensation and associated intensity of convection. Although aerosol-induced enhancement in freezing takes part in the increases in condensation by inducing stronger convergence around cloud bottom, the increases in condensation are similar to one order of magnitude larger than those in freezing. It is found that while aerosol-induced increases in freezing create intermittent extremely heavy precipitation, aerosol-induced increases in evaporation enhance light and medium precipitation in the multiple-cloud system here. This increase in light and medium precipitation makes it possible that cumulative precipitation increases with increasing aerosol concentration, although the increase is small. It is interesting that the altitude of the maximum of the time- and domain-averaged hydrometeor mass densities is quite robust to increases in aerosol concentration. This is because locations of gust fronts and homogeneous freezing do not vary significantly with changing aerosol concentration and this outweighs aerosol effects on hydrometeor size.</P>
블로그 사용자의 세분화와 전자상거래에 미치는 영향에 관한 연구
신민수(Shin, Min-Soo),염지환(Yum, Ji-Hwan),이우열(Lee, Woo-Yeul) 한국산학기술학회 2010 한국산학기술학회논문지 Vol.11 No.11
양방향 커뮤니케이션을 가능케 하고 사용자들간의 능동적 참여를 가능케 하는 블로그는 현재 2000만 이상의 사이트가 개설되었다. 본 논문에서는 블로거를 구분하는 특성 요인을 기반으로 블로거를 세분화하는 과정을 거치고, 세분화된 블로거의 특성을 분석함과 동시에 영향력이 작은 블로거의 어떠한 특정 요인이 영향력이 큰 블로거로의 전 환을 야기시키는지에 대한 분석을 하였다. 블로그의 내용적 요소와 심리적 요소를 독립변수로 설정하여 내용 및 심리 적 요소, 그리고 태도와 신뢰 및 구매의도와의 관계를 규명하였다. 연구 결과 블로그 사용자의 의견선도적 성향과 정 보탐색적 성향이 쇼핑몰에 대한 태도에 유의미한 영향을 미치는 것으로 분석되었다. Blogs that allow two way communications are open to the public more than 20 million sites these days. The study tries to categorize and classify blogs based on the common representative factors. As blogs are changing dynamically, the study also tries to figure out key factors either for growing or perishing dynamics. The study develops the research idea from the independent variables such as contents factors and psychological factors to the controlling factors such as trust, attitude, and purchasing intention. The research found out that opinion leading and information seeking tendency are significantly related to the attitude to the internet shopping mall.
Kim, Najin,Park, Minsu,Yum, Seong Soo,Park, Jong Sung,Song, In Ho,Shin, Hye Jung,Ahn, Joon Young,Kwak, Kyung-Hwan,Kim, Hwajin,Bae, Gwi-Nam,Lee, Gangwoong Elsevier 2017 Atmospheric environment Vol.153 No.-
<P>Aerosol physical properties, chemical compositions, hygroscopicity and cloud condensation nuclei (CCN) activities were measured in Seoul, the highly populated capital city of Korea, during the Megacity Air Pollution Studies (MAPS-Seoul) campaign, in May-June 2015. The average aerosol concentration for particle diameters >10 nm was 11787 +/- 7421 cm(-3) with dominant peaks at morning rush hours and in the afternoon due to frequent new particle formation (NPF) events. The average CCN concentration was 4075 +/- 1812 cm(-3) at 0.6% supersaturation, with little diurnal variation. The average hygroscopicity parameter (K) value determined using a humidified tandem differential mobility analyzer (HTDMA) ranged 0.17-0.27 for a range of particle diameters (30-150 nm). The K values derived using the aerosol mass spectrometer (AMS) data with three different methods were 0.32-0.34, significantly higher than those from HTDMA due to the uncertainties in the hygroscopicity values of different chemical compositions, especially organics and black carbon. Factors affecting the aerosol hygroscopicity seemed to be traffic and chemical processes during the NPF events. The CCN concentration predicted based on HTDMA K data showed very-good agreement with the measured one. Because of the overestimation of K, CCN closure with the predicted CCN concentration based on AMS K data over-predicted CCN concentration although the linear correlation between measured and predicted CCN concentration was still very good. (C) 2017 Elsevier Ltd. All rights reserved.</P>