• Knowledge Management Research
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• v.18 no.3
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• pp.163-178
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• 2017

Recent advances in technology are evolving to enable individuals to perform various activities necessary for their lives, without being constrained by physical, temporal, and spatial constraints. The online services and experiences that originated from solving the discomfort in the actual offline space have created the newness that can only be experienced in the digital world and furthermore uniquely new experiences in actual space as well. While many previous studies have suggested several interpretations of unique individual behaviors in virtual environments, a recent research approaches virtuality as an interesting perspective of the change of thinking style. Virtuality is defined as how far apart we are from everyday reality, and if the individual faces a situation far from reality, the psychological distance of the individual becomes distant and ultimately leads to the thinking style of high construal level. Otherwise, it is said to have a relatively low construal level of thinking style. In this study, I try to confirm the virtual distance as the role of psychological distance in new virtual contexts. Simultaneously considering temporal distance, which are most used in psychological distance, and virtual distance based on virtuality, this study tries to find whether the effect of virtual distance on product attitude is the same as that of temporal distance and check the relationship between virtual distance and temporal distance in the context of consumers' product evaluations depending on product information type.

• Journal of Advanced Marine Engineering and Technology
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• v.11 no.3
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• pp.31-44
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• 1987

Nowadays, the problems of energy and environmental pollution become serious day by day and the diesel engine, which has been proved to be superior to gasoline engine with respect to fuel consumption and ecological problems of exhaust gas, has been adopted widely for various purposes from the marine diesel engine and the dynamo engine to all kinds of engine on land. Therefore, extensive parametric studies on combustion of diesel engine should be done for its desing and improvement. To predict the behavior of diesel engien according to variable operating conditions by means of cycle simulation, the reasonable pattern of heat release rate has to be asumed. But it is necessary to know the actual variation of heat release rate in order to assume the reasonable pattern of heat release rate according to the actual operating conditions. In this paper, on a high speed small bore diesel engine with pre-combustion chamber, experimental investigations were carried out to determine the relationship between the heat release pattern and parameters such as engine load and speed. And also, the theoretical investigations about the performance variations of the above diesel engine according to the predicted pattern of heat release rate variation were performed. From the above observations, it may be said that the Fanboro indicator, which was used to get the cylinder pressure, can be used to estimate a reasonable pattern of heat release rate and it is confirmed that the pattern of heat release rate for the pre-combustion type engine is different from that of the direct injection type engine.

• Journal of Information Technology Services
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• v.19 no.2
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• pp.69-82
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• 2020

In the growth of IT industry, interest in wearable device has been globally rising along with the evolution of technology. A Smartwatch is expected to be at the center of wearable device industry in the future. However, there are some concerns that most of its actual sales are caused by gifts or bundling. Motivated by these issues, this study propounds the ideas that to enter the mainstream market, the empirical research is required for actual consumers who continue to use a smartwatch. The purpose of this study is to identify key factors affecting user satisfaction and antecedents affecting continuance intention to use from consumer perspectives. Further, assuming consumers' perceptions will be different according to how they acquired smartwatch, this study classified the group as direct buyers and acquired users. To achieve the purpose of the research, this study analyzes the usage of smartwatch by integrating the IS Success Model and IS Continuance and Habit Theory. We implemented the survey of 338 smartwatch users, and the research findings indicate that information quality and system quality have significant effects on satisfaction, and consequently satisfaction and habit positively affect the continuance intention to use. Additionally, it is found that there was a significant difference in the relationship between satisfaction and habit in the group divided by acquisition type. Based on these findings, this study provides theoretical and practical implications.

• The Korean Journal of Health Service Management
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• v.10 no.4
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• pp.1-11
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• 2016

Objectives : The aim of this study is to investigate the actual condition of the occurrence and recovery of medical expenses through seafarers insurance and to provide basic data that will be helpful in the establishment of efficient hospital management strategies for medical expenses of insurance companies depending on the type of seafarers insurance. Methods : Three general hospitals located in Busan, Korea, were selected, and seafarers insurance claim data was collected from January 1, 2012 to December 31, 2013(24 months) and analyzed. There were 5,490 cases in total. Results : There was a significant difference in the distribution of disease incidence, accrued medical expenses, reimbursement of medical expenses, and the actual condition of medical receivables depending on the insurance company. Conclusions : Therefore, differentiated payback strategies for medical expenses are needed that consider the various seafarers insurance companies and their treatment characteristics.

• Journal of the Korean Ceramic Society
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• v.32 no.7
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• pp.777-782
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• 1995

The scale up production test for the hydrothermal synthesis of clay mineral from the anorthite, which is distributed in San Chung-District of Korea and called as the ground rock for halloysite-kaolin, has been investigated by using the gaitator type reactor. The automatic control system has been developed and applied for the more effective producibility and the reduction in the defect of this intermittent batch processing property, and finally for the feasibility of this system in actual use. It was observed that this agitator type reactor can reduce the synthesis reaction tme from 5 days to 3 days, only with the condition of 20rpm. The automatic control system could regulate the vessel temperature and pressure precisely at an optimum condition during the treatment. Therefore, from these test results the application-possibility for this system was found to be feasible in actual use.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.14 no.11
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• pp.972-980
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• 2002

This work is aimed at estimating the effects of various factors on the energy consumption of Korean-style apartment houses using TRNSYS. The factors considered here include the nominal size of floor area, type of remodeling, azimuth, sidewall insulation, and window type. Based on some assumptions, an actual apartment house is simplified into a model that is used for thermal load calculations. The simplified model is validated by showing a good agreement with the actual one in the predicted result. Remodeling balconies into unconditioned buffer spaces yields a favorable thermal performance in comparison with the original type regardless of the nominal size. Incorporating balconies into a conditioned indoor space leads to sharp increases in thermal loads, which must be avoided in view of energy conservation as well as structural problem. A quantitative assessment on the azimuthal effect indicates that the heating energy can be saved up to 16％ by taking the south or southeast direction. Reduction in the heating load with enhancing the sidewall insulation is gradual, so that a cost-effectiveness analysis may be needed when amending the regulations concerned. Glazing appears to significantly affect the heat transfer through window. A typical case illustrates that the heating load is decreased about 25％ by simply adopting triple glazing instead of double glazing.

• Journal of Wetlands Research
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• v.4 no.1
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• pp.21-31
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• 2002

Vegetation structure and sediment properties were investigated in the Wondong wetland of the Nakdong-gang, Yangsan-city, Gyeongsangnam-do, Korea. The vegetation type was classified into eleven communities based on the actual vegetation map: Miscanthus sacchariflorus community, Salix nipponica community, Phragmites communis community, Zizania latiofolia community, Trapa japonica community, Hydrilla verticillata community, Hydrocharis dubia community, Digitaria sanguinalis community, Nelumbo nucifera community, Phragmites japonica community, and Salix matsudana for. tortuosa community. Among them, Distribution area of Miscanthus sacchariflorus community was largest as 12.4 ha (36.3%). The dominant vegetation type was Miscanthus sacchariflorus community based on phytosocialogical method, and it was classified into two subcommunities; Persicaria maackiana - Miscanthus sacchariflorus subcommunity and Hydrilla verticillata - Miscanthus sacchariflorus subcommunity. Ranges of the sediment properties such as pH, conductivity, organic matter, total nitrogen, and available phosphorus were 4.9~6.2, $23{\sim}423{\mu}mho/cm$, 0.37~11.16%, 0.02~0.36% and 0.14~0.38mg/100g, respectively. Percentages of the partical size of the sediment such as clay, silt, and sand were 5.0~27.0%, 6.7~31.3%, and 46.7~88.3%, respectively.

• Journal of Wetlands Research
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• v.5 no.2
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• pp.67-81
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• 2003

Vegetation structure was investigated in the Hwapo wetland around the Nakdong-gang, Gimhae-city, Gyeongsangnam-do, Korea from May to August, 2001. The vegetation type was classified into 18 communities based on the actual vegetation map: Phragmites communis community, Miscanthus sacchariflorus community, Salix nipponica community, Echinochloa crus-galli var. frumentacea community, Zizania latiofolia community, Cyperus amuricus community, Spirodela polyrhiza community, Trapa japonica community, Phragmites communis-Miscanthus sacchariflorus community, Salix nipponiaz-Misaznthus sacchariflorus community, Cyperus amuricus-Acorus calamus var. angustatus community, Salvinia natans community, Hydrilla verticillata-Spirodela polyrhiza community, Persiazria maackiana community, Trapa japonica-Salvinia natans community, Hydrilla verticillata community, Potamogeton crispus community, and Populus deltoides community. Among them, Phragmites communis community was the largest (34.9 ha, 29.53%). The dominant vegetation type was Persiazria hydropiper - Persicaria maackiana community based on the phytosociological method, and it was classified into four subcommunities: Phalaris arundinacea-Salix nipponica subcommunity, Miscanthus sacchariflorus subcommunity, Phragmites communis subcommunity, and Spirodela polyrhiza subcommunity, and Acorus calamus var. angustatus group belongs to Miscanthus sacchariflorus subcommunity.

• Geomechanics and Engineering
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• v.9 no.3
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• pp.275-286
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• 2015

A new method is presented to recover missing deformation data of lateral walls of foundation pit when the monitoring is interrupted; the method is called Dynamic Mathematical Model - Parameter Interpolation. The deformation of lateral walls of foundation pit is mainly affected by the type of supporting structure and the situation of constraints, therefore, this paper mainly studies the two different kinds of variation law of deep horizontal displacement when the lateral walls are constrained or not, proposes two dynamic curve models of normal distribution type and logarithmic type, deals with model parameters by interpolating and obtains the parameters of missing data, then missing monitoring data could be Figured out by these parameters. Compared with the result from the common average method which is used to recover missing data, in the upper 2/3 of the inclinometer tube, the result by using this method is closer to the actual monitoring data, in the lower 1/3 part of the inclinometer tube, the result from the common average method is closer to the actual monitoring data.

• Proceedings of the KWS Conference
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• 2009.11a
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• pp.102-102
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• 2009

The purpose of this study is to establish the predictive equation of transversal residual stress at the thick weldment of large container ship. In order to do it, the variables used for this study were restraint degree, yield strength of base material, thickness of weldment and welding heat input. Here, the level of restraint degree at the thick weldment of container ship having the various welding sequence was calculated using FEA. From the result, the h-type specimen was designed to simulate the level of restraint degree at the actual weldment of containership. With H-type test specimen designed, the effect of the variables on the distribution of transversal residual stress at the weldment in a container ship was evaluated using the comprehensive FEA. Based on the results, the predictive equations of mean value and the distribution of transverse residual stress in each location of residual stress were established using dimensional analysis and multiple-regression method. The validation of predictive equations was verified by comparing with measured results by XRD in the actual weldment of the ship.