• Journal of the Korea Academia-Industrial cooperation Society
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• v.3 no.3
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• pp.189-193
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• 2002

The research is concerned with digitalization process and strategy of 'traditional industries'. Along with development of the Internet, new industries are emerging, while traditional industries are also rapidly shifting from old modes to new ones. Most traditional industries uy to enhance their adaptability for changing environment. The investigators argue the strategic intent of traditional industries can be categorized into the four different types. The typology consists of two axis. On the one hand, the directions of digitalization are rationalization and development of new business. On the other hand, the objects of digitalization are product and process. According to the typology, the research suggests neologism for the four strategies; product innovation strategy. new business strategy. rationalization strategy and process innovation strategy.

• Journal of the Institute of Convergence Signal Processing
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• v.11 no.1
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• pp.26-31
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• 2010

We proposed a new directional edge based interpolation, DEBI, by combining two weighted directional information to reduce blurred edges and annoying artifacts. Four isotropic gradient masks are employed in defining edge directions and they are proven to hold a first order derivative relation with respect to a rotating coordinate. Two minimum gradients among four absolute directional results are shown to be sufficient to describe slant edges efficiently. Compared with widely used bilinear and bicubic interpolation methods, the proposed algorithm results in a noticeable improvement along edge area.

• Journal of the Korean Society of Combustion
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• v.7 no.2
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• pp.62-68
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• 2002

To investigate statistics of flamelet in a turbulent premixed flame and to obtain components of their burning velocities in a vertical plane above a pipe-flow burner, the local motion of flamelets with respect to gas are measured by specially arranged diagnostics, composed of an electrostatic probe with four identical sensors and a two-color four-beam LDV system. With this technique, the three-dimensional local flame- front-velocity vector is measured by the electrostatic probe for the first time, and simultaneously the axial and radial components of the local gas-velocity vector in a vertical plane above the vertically oriented burner are measured by the LDV system. Two components of burning velocities of planar flamelets can be obtained from these results and are found to be distributed over different directions and to range in magnitude from nearly zero to a few times the planar, un strained adiabatic laminar burning velocity measured in the unburnt gas. It may be concluded from these results that turbulence exerts measurable influences on flamelets and causes at least some of them to exhibit increased burning velocity.

• Magazine of the Korean Society of Agricultural Engineers
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• v.11 no.3
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• pp.1707-1718
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• 1969

The purpose of this experiment is to determine the relations between numbers, arrangements and pumping rates of wells. In this experiment, well pipes were vertically set up in an artificial water-bearing sand layer of homogeneous quality. Wells were arranged in different ways and their number was varied in order to observe the variation of pumping rates. Sands were filled in a square tank, $183cm{\times}91.5cm{\times}91.5cm$ so as to secure a water-bearing layer. Water was constantly supplied from a supply tank located at an end of the tank. The number of well pipes was varied from one to four. Well pipes were connected by a horizontal header pipes were connected by a horizontal header pipe located above them and one pump was used. Pumping rates were measured, when they were arranged in longitudinal and lateral directions, They were also arranged in a square and triangle. The main results thus obtained are presented as follows: (1) When well pipes are laid out in a longitudinal line, i. e., in a flow direction, the ratios of pumping rates of one-pipe well and wells 2-, 3- and 4- pipe t, are 1.903, 2.506 and 2.66, respectively. (2) When well pipes are laid out in a lateral line, i.e., in a perpendicular direction to flow, the same ratios as (1) are 1.912, 2.527 and 2.88. (3) When four pipes are laid out in a square and three pipes are laid out in a triangle, pumping rates are deereased, Comparing with the cases when pipes are laid out in a straight line.

• Journal of Korea Water Resources Association
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• v.46 no.7
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• pp.767-781
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• 2013

In this study, the hydraulic model experiments and numerical simulations are carried out to analyze the flood flow characteristics in and around a channel confluence connected asymmetrically with four channels. The numerical model applied in this study is ANSYS CFX (ver. 14) which is the commercial three-dimensional CFD model. As results of comparison between the measured and simulated water depth distributions in and around a channel confluence, the agreement is relatively well satisfied. It can be shown in this study that the water surface profiles in and around a channel confluence are significant different with the two channel directions in which the water are entering and increased inflow.

• Management & Information Systems Review
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• v.8
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• pp.147-166
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• 2002

This study investigated four universities in Busan and compared each other about the dimensions of service qality and relevant concepts. For empirical study, 288 respondents re sampled and six hypotheses are analyzed by using regression analysis and ANOVA. A survey was conducted with four university's students to see if there were significant differences in their perception(expectation, performance, perceived service quality, customer satisfaction, intention of repurchase) of a university administration service quality. The principal findings of this study are as follows: (1) A comparison of universities in terms of their expectations about university administration service revealed no differences, but performance revealed differences in specialization and reliability. (2) All of service dimensions, tangibles, reliability and specialization had significant impact on overall service quality. Specialization had the most significant impact on overall service Quality in A and D university, but tangibles had the most significant impact in B university. (3) Overall service Quality has a significant positive effect on customer satisfaction, but the degree of effect is different from each other. (4) Customer satisfaction has a significant positive effect on intention of repurchase, but the degree of effect is different from each other. In conclusion this study, however has a limitation about questionnaire, offers some strategic directions for developing the specific marketing strategies of university.

• The Journal of Fisheries Business Administration
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• v.25 no.2
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• pp.89-102
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• 1994

This paper is to survey the major results of the game-theoretic models and recent research directions of the literature on auctions and competitive biddings. This paper classifies the auctions and competitive biddings into the following four major types:(i) English auction, (ii) Dutch auction, (iii) the first-price sealed-bid auction, (iv) the second-price sealed-bid auction. In order to survey the major ideas related to auctions and competitive biddings, we use two representative theoretical models developed under the game-theoretic framework : (i) the independent private value model are summarized as follows ; (1) The Dutch auction and the first-price auction are strategically equivalent, and so are the English auction and the second-price auction. (2) At the symmetric equilibria, the expected selling price is the same for all four types of auction. Meanwhile, the major results of the general model are as follows ; (1) When bidders are uncertain about their value extimate, the English and second-price auctions are not equivalent, but the dutch and the first-price auctions are still strategically equivalent. (2) The English auction generates the higher expected prices than the second-price auction. Also, when bidders are risk-neutral, the second-price auction generated higher average prices than the Dutch and the first-price auctions.

• Journal of the Korean housing association
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• v.24 no.3
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• pp.85-94
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• 2013

This research investigates and characterizes lifestyles and housing preferences of Korean-American Baby Boomers in the USA, and proposes future housing design and planning directions to meet their needs. A questionnaire survey was conducted from June to September 2012 examining lifestyles and preferred characteristics of postretirement homes. We targeted Korean-Americans born from 1955 to 1963 in either Korea or the USA who currently reside in New York, Washington DC, Chicago, Dallas, Detroit, Lansing, Grand Rapids, and San Francisco. To analyze the 247 responses, we employed factor analysis, cluster analysis, one-way ANOVA, and crosstabs. Respondents preferred three-bedroom, singlefamily housing types with a size of 26-35 pyong, favoring city outskirts or suburbs over urban areas. Four groups having different lifestyle types were identified: innovators, believers, fashion experiencers, and makers. Housing preference differed depending on lifestyle types. The 'innovator' group desired homes 56 pyong or larger, while the other groups preferred 26-36 pyong. The four lifestyle groups did not show statistically significant differences in most of preferred housing features, community facilities, or indoor environmental characteristics. Each group still showed slightly different preferences in some housing planning characteristics, which future planners can refer to when providing postretirement homes for them.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.19 no.1
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• pp.1-12
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• 2015

This paper discusses current internet interconnection issues according to radical changes of internet traffic pattern. In this context, the recovery of network investment cost for network provider becomes hot issue. For recovery issues of investment cost, there are many disputes among stake holders. Therefore, it is necessary to investigate this issues in the context of internet interconnection. Also, it is important to develop the current regulation about internet interconnection under traffic changing environments. This paper selects four issues to deal with and analyzes the present situations and problems about these issues, and provides alternatives for internet interconnection corresponding to these four issues.

• Korean Journal of Applied Biomechanics
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• v.28 no.2
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• pp.109-117
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• 2018

Objective: To compare head and hand movement patterns during squash forehand motions between experts and less-skilled squash players. Method: Four experts and four less-skilled squash players participated in this study. They performed squash forehand swings and a VICON motion analysis system was used to obtain displacement and velocity data of the head and right hand during the movement. Mann-Whitney U-tests were performed to compare head and hand range of motion and peak velocity, and cross-correlation was performed to analyze the head-hand coordination pattern between groups in three movement directions. Results: In terms of head and hand kinematic data, experts had greater head range of motion during down swings than less-skilled squash players. Experts seemed to reach peak hand velocity at impact by reaching peak head velocity followed by hand peak velocity within a given temporal sequence. In terms of head-hand coordination patterns, both groups revealed high positive correlations in the medial-lateral direction, indicating a dominant allocentric coordination pattern. However, experts had uncoupled coordination patterns in the vertical direction and less-skilled squash players had high positive correlations. These results indicate that the head-hand movement pattern likely an important factor squash forehand movement. Conclusion: Analysis of head and hand movement patterns could be a key variable in squash training to reach expert-level performance.