• The Journal of Korean Association of Computer Education
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• v.15 no.6
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• pp.21-31
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• 2012

The purpose of this study was to examine acceptance factors that affect the intention to use digital textbook. The results are as follow. First, the quality characteristic factor has significant effects on the ease of use, the usefulness of use, and the intention of use. Second, the ease of use appeared to be a significant impact on the usefulness of the use. The usefulness of digital textbook appeared to be a significant impact on the intention of use. The results show that the quality characteristics consisted of six components: personalization, mobility, stability, accuracy, responsiveness, and accessibility. The results can suggest important implications for the development of digital textbook contents and system.

• Journal of Engineering Education Research
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• v.17 no.1
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• pp.50-56
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• 2014

The purpose of this study was to investigate the relationship between team creativity and two distinct aspects of team personality composition: (a) team personality elevation (TPE) (b) team personality diversity (TPD). and team creativity. Engineering college students (N＝249) working in 48 teams were assessed on the Big 5 personality traits. For the traits of extraversion and openness to experience, TPD predicted team creativity; TPE of conscientiousness, agreeableness, and neuroticism predicted team creativity. Finally, limitations of this study and suggestions for future studies were discussed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.12
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• pp.5518-5524
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• 2011

The purpose of this study is to investigate the change of balance ability on aging by measuring balance ability of elderly females whose age is over 65. The subjects are ten elderly women (the mean age: 71.9) able to walk without assistants, the assistant equipments and drug dependence and ten young healthy women (the mean age: 23.2). We measured stability index (ST), Fourier index (F), weight distribution (WD), weight distribution index (WDI), synchronization index (SI) and fall index (FI) by using Tetrax (Tetra-ataxiometric Posturography). In result, STs and Fs at the low frequency region (F1) represented the significant difference between two groups at all postures with PO (pillow with eye open) exception (p<.01). Fs at the other frequency regions (F2~F8) represented the significant difference between two groups (p<.05). WDI of the elderly women represented the higher values than the young women at all postures but there are the significant difference at PO and PC (pillow with eye closed) only. These results may be due to age-related ability decline of somatesthesia, vestibular organ, central nervous system.

• Journal of Industrial Convergence
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• v.20 no.1
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• pp.35-42
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• 2022

This study divided employee performance factors into individual, organizational, and institutional factors, and empirically analyzed their relationship with performance evaluation results. Based on the final 417 samples, the results using the SPSS and AMOS are summarized as follows. Among the performance factors, job satisfaction and a fair performance system showed a significant positive (+) relationship with the individual performance evaluation results, and it was difficult to find a clear correlation with stable interpersonal relationships. Job satisfaction (β= 0.432, t= 7.375^***) had the greatest impact, followed by a fair performance system (β= 0.127, t= 2.406^*). This can be said to be the case where the cause of performance is satisfaction with the job and the recognition that the organization's performance system is fair. However, it was found that stable interpersonal relationships, that is, interpersonal relationships that have smooth relationships with other people and are accompanied by psychological stability, are not a performance factor. Based on the empirical analysis results, a discussion on performance factors, implications of this study, and future research directions are presented.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.30 no.6C
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• pp.219-229
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• 2010

Slope failure in South Korea generally occurs by the localized heavy rain in a rainy season and typhoon, and it annually causes huge losses of both life and property because nearly 70% of territory in South Korea is covered with mountains. It is required to measure the risk of slope failure quantitatively before proper prevention methods are provided. However, there is no way to estimate the risk based on realtime rainfall, geological characteristics, and geotechnical engineering properties. This study presents the development of digital terrion model to predict slope stability using infinite slope stability theory combined with temporal groundwater change. Case studies were performed to investigate factors to affect slope stability in Japan.

• Journal of Chest Surgery
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• v.30 no.10
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• pp.1010-1014
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• 1997

Judet's rib struts which are designed for osteosynthesis are made of stainless steel This report describes clinical analysis of our experiences of 30 cases with the operative stabilization of multiple rib fractures with Judet's rib struts from December, 1995, to December, 1996 in Chungmoo Hospital, Chounan. Our indications for operative stabilization were as follows: 14 cases in flail chest, 8 cases in severe displacement of rib including segmental fractures, 7 cases in additional procedures during intrathoracic operation, and 1 case in other cause. Postoperative artificial ventilation is needed in only 1 case for 5 days and postoperative complications were few: 2 cases of hemopneumothorax, 2 cases of alcohol withdrawal delirium, and 1 case of postoperative hepatitis. Average duration of hospital admission who have limited thoracic injuries was 10.5 days. Though more comparative studies is necessary, we find this technique to be better than previously published m thods, since it provides better stabilization and immobilization of the ribs and shortening the duration of hospital admission.

• The Journal of the Korea Contents Association
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• v.19 no.2
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• pp.438-449
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• 2019

This study explored the perception of internet media credibility and influencing factors among college students who are routine users of internet-based media. Media literacy competences are of primary interest among others in that users' media literacy such as information evaluation, critical understanding of media, and information sharing are assumed to be related to media credibility. The results of analysis revealed critical understanding ability to be statistically significant and consistently influencing factor. Users with more critical view on media ownership, represented reality, commercial intention of media seemed less likely to trust internet media. Whereas media use motive for information was found to be a strong predicting factor, motive for pleasure showed no relationship with credibility. Based on the findings, suggestions for new research and limitations of the study were discussed.

• Korean Journal of Soil Science and Fertilizer
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• v.18 no.2
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• pp.121-127
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• 1985

This study was designed to gain practical data on the use of soil conditioners for more efficient water managements and to establish the optimum levels of structural properties for soil conditioning. A sandy loam and a silt loam soil were each treated with two different soil conditioners, hydrophobic Bitumen or hydrophilic Uresol. The perspex tube 34 cm long were packed homogeneously with air dried soil up to 2 cm below the top, then covered over 2 cm of treated or untreated aggregates. The infiltration rate into the soil columns was measured under simulated rainfall condition. The evaporation study was carried out in the wind tunnel, and the changes of soil moisture distribution of the columns following and during the evaporation were determined by a gamma ray scanner. The infiltration rate of water into the soil column was increased to 18.7-50.8% by the Uresol treatment but it was decreased to less than 25% of control by the Bitumen treatment. Evaporation was decreased to 22.0-68.1% by the Bitumen treatment and to 38.7-68.4% by the Uresol treatment. The water use efficiency of Uresol treated column was increased to more than twice as much as that of untreated soil. Aggregate stability and wetting angle were related to water infiltration and evaporation. A positive and highly significant logarismic relationship was found between the infiltration rate and stability index-wetting angle, evaporation rate and instability index-wetting angle. It was considered that the structural stability is more important than wetting angle. This is true because the structural stability is always positively correlated to water saving, however wettability is positively correlated to the infiltration, and negatively correlated to water saving during the evaporation.

• Transactions of the Korean Society of Automotive Engineers
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• v.15 no.6
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• pp.120-127
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• 2007

This paper describes the development of a nonlinear observer for four wheel steer (4WS) vehicle. An observer is designed to estimate the vehicle variables difficult to measure directly. A brake yaw motion controller (BYMC), which uses a PID control method, is also proposed for controlling the brake pressure of the rear and inner wheels to enhance lateral stability. It induces the yaw rate to track the reference yaw rate, and it reduces a slip angle on a slippery road. The braking and steering performances of the anti-lock brake system (ABS) and BYMC are evaluated for various driving conditions, including straight, J-turn, and sinusoidal maneuvers. The simulation results show that developed ABS reduces the stopping distance and increases the longitudinal stability. The observer estimates velocity, slip angle, and yaw rate of 4WS vehicle very well. The results also reveal that the BYMC improves vehicle lateral stability and controllability when various steering inputs are applied.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.4
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• pp.70-75
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• 2018

This paper describes an Integrate Dynamic Control system with Brake System (IDCB) for SUV vehicles. The system was developed to stabilize the lateral dynamics, maintain the steerability and improve the ride comfort on various roads. A fuzzy logic control method is used to design the IDCB. The performance of the IDCB is validated under different road and driving conditions. The results show that the IDCB tracks the reference yaw rate under all tested conditions; in addition, it reduces the body slip angle and roll angle. When a vehicle runs on a split-${\mu}$ road and a brake input is applied, the IDCB virtually eliminates the lateral dynamics. Thus, the IDCB improves the lateral stability, preserves the steerability and enhances the ride comfort of vehicles.