• KSCE Journal of Civil and Environmental Engineering Research
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• v.31 no.2B
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• pp.109-119
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• 2011

In this study, the flow characteristics of Han River Estuary were investigated by using a two-dimensional numerical model according to the assumption of shift and modification of the Shingok submerged weir. The two-dimensional analysis has contributed to our understanding of the hydraulic effects induced by shift of the weir on the topography, especially wetlands. The tide and flow discharge of 2007 were adopted as an input data for the simulation. The tidal data contained both spring and neap tide, and the flow discharge condition was divided into monsoon and normal seasons. The boundaries of this study were Hangang Bridge, Tongil Bridge, and Yu island. The simulation results showed that influence area of seawater changed depending on the weir shift, and the water level at particular station fluctuated according to the condition of tide and flow discharge.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.6
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• pp.559-566
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• 2018

Higher education has become a global phenomenon. Although existing research on the effects of education level have been carried out, most studies were conducted before the year 2000 in a western context. In addition, the research sample was collected mainly from the manufacturing and police sectors. Furthermore, previous studies did not consider various moderating variables. Therefore, this study investigated the direct effect of education level on job satisfaction and the moderating effect of the job position between them. To test the hypotheses, a cross sectional research design with data from a sample of 377 full-time nurses, medical technicians, and administrative staff in one hospital located in the Northern part of Kyunggi province was used. The results showed that the education level was positively related to job satisfaction and job position alleviated the positive relationship between the education level and job satisfaction.

• Journal of Korean Society of Transportation
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• v.35 no.6
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• pp.525-544
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• 2017

With the advent of the big data era, the interest in the development of land using traffic data has increased significantly. However, the current research on traffic big data lingers around organizing or calibrating the data only. In this research, a novel method for discovering the hidden values within the traffic data through data mining is proposed. Considering the fact that traffic data and network structures have similarities, network analysis algorithms are used to find valuable information in the actual traffic volume data. The PageRank and HITS algorithms are then employed to find the centralities. While conventional methods present centralities based on uncomplicated traffic volume data, the proposed method provides more reasonable centrality locations through network analysis. Since the centrality locations that we have found carry detailed spatiotemporal characteristics, such information can be used as an objective basis for making policy decisions.

• Journal of Korean Society for Geospatial Information Science
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• v.17 no.4
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• pp.87-93
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• 2009

The increased person interests in health in accordance with improved living standards result in the booming population who enjoy mountain climbing. Although there are more climbers than ever, most existing mountain paths are those which have been made naturally by people utilizing them to get to the peak and therefore cannot meet the various needs of emerging mountain climbers. Thus, this study that establish a data using numerical map and TotalStation aimed to provide them with beneficial information on mountain paths, analyzing each path using GIS. The subjects of this study are limited to Kum-Am which is in Kyungnam province, Korea. According to out research, proper slopes for the majority of mountain climbers, mostly in their from 30s to 50s, are turned out to be HG1 and JG1-JG2-JG3.

• Korean Journal of Construction Engineering and Management
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• v.14 no.4
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• pp.152-163
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• 2013

In this research, we analyse the economic feasibility of a tidal power plant project which can efficiently generate mass, permanent, predictable, and homogeneous electric power. For the economic feasibility analysis, we used the RETScreen that is developed at the CANMET Energy Technology Center in Natural Resources Canada and widely utilized for analysing the economic feasibility and sensitivity of clean energy projects. Results from the feasibility and sensitivity analysis showd that the tidal power plant project in Korea has a enough economic feasibility, and its feasibility increases more as certified emission reductions price and electricity unit price increase. Based on the results from the feasibility study, we can solve the energy problems to be come in near future by constructing the tidal power plants in Korea more aggressively.

• Aerospace Engineering and Technology
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• v.10 no.1
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• pp.79-88
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• 2011

A fill-drain valve is operated by provided control gas at the ground for liquid propellant feeding system of space launch vehicle, which fills or drains on-board propellant tanks with a cryogenic oxidizer. We have analyzed and modified the data of fill-drain valve designed by Yuzhnoye. The simulation model of fill-drain valve is designed by using the AMESim code to predict and evaluate the dynamic characteristics and pneumatic behavior of valve. In this study, we performed a dynamic characteristic simulation on design parameter. And we could predict opening/closing time and pressures, operating performances on design parameters. This study will serve as one of reference guides to enhance the developmental efficiency of fill-drain valves with the various operating requirements, which shall be used in the Koreanized Space Launch Vehicle.

• Journal of Korea Port Economic Association
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• v.35 no.4
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• pp.67-84
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• 2019

In order to suggest ways to enhance service competitiveness in cruise and destination, this study developed a measure of cruise tour service and analyzed the impact and relative importance on customer satisfaction. Specifically, for the service quality analysis, based on the SERVPERF model, the specialty of the industry was reflected through the arguments of tourism and transport logistics, and the three factors of cruise service quality and destination service quality were derived and utilized as measurement tools. As an analysis method, factor and reliability analysis were conducted using data collected via a survey. Next, correlation analysis was conducted to analyze the relationship between variables and regression analysis was performed to check the impact of cruise tour service quality on customer satisfaction. The study found that both cruise service attributes and destination service attributes had a positive effect on customer satisfaction and that the relative importance of service attributes was identified. Accordingly, it was found that the service quality should be formed by reflecting arguments in the tourism and transport logistics sectors and that the service should be further improved and developed according to the importance of the service attributes so as to enhance cruise tour products.

• Journal of Veterinary Clinics
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• v.27 no.5
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• pp.559-564
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• 2010

The purpose of this study was to evaluate the value of dacryoscintigraphy with Tc-99 m Pertechnetate, which is useful in functional nasolacrimal duct obstruction diagnosis in human medical science, by applying it to normal dogs. Dacryoscintigraphy was performed on six clinically healthy beagle dogs to confirm normal passage of their lacrimal ducts. The scintigraphic images of both lacrimal system were obtained at 5 min, 10 min, and 20 min after Tc-99 m Pertechnetate administration, respectively. If lacrimal duct does not come into view within 20 min, delayed images at 30min, 45min and 60 min were gained. After drawing ROI of left and right canaliculus, lacrimal sac, and nasolacrimal duct acquired after dacryoscintigraphy, we measured each counting rate and developed a counting rate table for each time interval. Of the total of 12 places, 10 (83.3%) showed patency within 20 min, and 11 (91.6%) showed patency within 30 min. In one dog, a functional obstruction of right lacrimal canal was observed. Dacryoscintigraphy could provide useful information about functional and anatomical lacrimal duct obstruction in veterinary medicine as well as in clinical research.

• Journal of Environmental Science International
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• v.15 no.8
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• pp.745-757
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• 2006

We focus on the improvement of accuracy of sea surface wind over complex coastal area doling the warm season. Local Analysis Prediction System (LAPS) was used to improve the initial values in Mesoscale Meteorological model (MM5). During the clear summer days with weak wind speed, sea surface wind simulated with LAPS was compared with the case without LAPS. The results of modeling with LAPS has a good agreement mesoscale circulation such as mountain and valley winds on land and in case of modeling without LAPS, wind speed overestimated over the sea in the daytime. And the results of simulation with LAPS indicated similar wind speed values to observational data over the sea under influence of data assimilation using BUOY, QuikSCAT, and AMEBAS. The present study suggests that MM5 modelling with LAPS showed more improved results than that of without LAPS to simulate sea surface wind over the complex coastal area.

• Journal of The Korean Association of Information Education
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• v.19 no.4
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• pp.441-448
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• 2015

This paper describes about a software implementation for class analysis and quantization based on our video synchronization method. We proposed a new indexing method, synchronization strategies, and data structure for our analyzer implementation. We implemented a class video analyzer using intelligent multimedia technologies which can play class video selectively. Our proposed method analyzes class videos depending on the time schedule composed of introduction, development and summary stages. We apply our analysis filters to the class videos in the predefined regular intervals. We experimented on the synchronization performance of our proposed method and software. In the experimental, we could demonstrate the effectiveness and practicality of our class analyzing method within the margin of error.