• Journal of the Korea Institute of Information and Communication Engineering
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• v.13 no.12
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• pp.2489-2497
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• 2009

The objective of this research is to get the lesson of the policy by searching the factors of technology acceptance focused on u-Health system. For the purpose of this research, this study presented the concept of u-Health and literature review associated with technology acceptance. Also, this research analyzed the factors affecting 'acceptance of u-Health system'. As a result of the analysis, the first factor affecting acceptance of u-health system is 'self-efficacy' and the second factor is 'connecting'. These results showed characteristics of the innovative aspects and the 'anytime and anywhere' in the ubiquitous concept. Therefore, considering these factors when developing with the priority of u-health system will be able to increase the likelihood of business revenue.

• Journal of Engineering Education Research
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• v.15 no.2
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• pp.38-45
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• 2012

The purpose of this study is to investigate the perception of invited foreign scientists about the actual conditions and status of operating World Class University(WCU) project in Korea. Most of them participated in the project are to promote joint research and exchange innovative ideas internationally as well as to develop their own research. Overall, they seemed to be content with the current status and operation of WCU project. They estimated the level of research universities that they are involved in positively, and also keep a positive view of their future. However, they seemed to experience some difficulties in the operation WCU project, stemming from rigid government regulations and quantity-driven evaluation mechanism. For the future, foreign scientists pointed encouraging students' research self-efficacy and research capability through frequent and direct training and interaction between faculty and students is one of the foremost tasks for the Korean research universities to become World Class Universities.

• Proceedings of the Korea Water Resources Association Conference
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• 2021.06a
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• pp.147-147
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• 2021

A partition of water distribution network (WDN) into district metered areas (DMAs) brings the efficiency and efficacy for water network operation and management (O&M), especially in monitoring pressure and leakage. Traditionally, the DMA configurations (i.e., number, shape, and size of DMAs) are permanent and cannot be changed occasionally. This leads to changes in water quality and reduced network redundancy lowering network resilience against abnormal conditions such as water demand variability and mechanical failures. This study proposes a framework to automatically divide a WDN into dynamic DMA configurations, in which the DMA layouts can self-adapt in response to abnormal scenarios. To that aim, a complex graph theory is adopted to sectorize a WDN into multiscale DMA layouts. Then, different failure-based scenarios are investigated on the existing DMA layouts. Here, an optimization-based model is proposed to convert existing DMA layouts into dynamic layouts by considering existing valves and possibly placing new valves. The objective is to minimize the alteration of flow paths (i.e., flow direction and velocity in the pipes) while preserving the hydraulic performance of the network. The proposed method is tested on a real complex WDN for demonstration and validation of the approach.

• Journal of Engineering Education Research
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• v.15 no.2
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• pp.20-29
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• 2012

The purpose of this study was to explore the academic achievements, learning attitudes, and career compromising processes for successful undergraduate students in the College of Engineering. To achieve this goal, research was conducted to analyze whether there was a strong major-career connection among Engineering students of Seoul National University. Afterwards, differences in levels of academic achievement, learning attitude, and academic aspiration were analyzed between students who had achieved a major-career match and students who had not. As a result, it was found that the level of major-career connection was highly correlated to the level of academic achievement; furthermore, learning attitudes were strongly related to the level of motivation towards a high academic achievement, and influenced future learning attitudes as well. These findings suggest that further academic support, career guidance, and major switching policies are needed for undergraduate students in Colleges of Engineering.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2013.10a
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• pp.254-257
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• 2013

A Meta-analysis is a statistical literature synthesis method that provides the opportunity to view the research context by combining and analyzing the quantitative results of many empirical studies. The Technology Acceptance Model (TAM) has been the subjects of a great deal fields and now also has been continuously studied. Recently, the issue of the biggest the information communication and information systems fields is smart. At this point, we conducted a Meta-analysis and review of external constructs based on the technology acceptance model. This study was targeted a total of 106 research papers that are setting up the causal relationship in the technology acceptance model among the research papers published in domestic academic journals before 2013. The result of the Meta-analysis, the biggest effect size the path from external Variables to perceived usefulness was showed playfulness. The effect size was 0.536 in the path from perceived usefulness to playfulness. And, the biggest effect size the path from external Variables to perceived ease of use was showed self efficacy. The effect size was 0.536 in the path from perceived ease of use to self efficacy. Based on the results, it was discussed the difference through comparative analysis with previous research.

• Structural Engineering and Mechanics
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• v.91 no.3
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• pp.315-324
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• 2024

An expansive soil in 4970 special railway line in Dangyang City, China, has encountered a series of landslides due to the expansion characteristics of expansive soil over the past 50 years. Thereafter, a sheet-pile retaining structure was adopted to fortify the expansive soil slope after a comprehensive discussion. In order to evaluate the efficacy of engineering measure of sheet-pile retaining structure, the field test was carried out to investigate the lateral pressure and pile bending moment subjected to construction and service conditions, and the local daily rainfall was also recorded. It took more than 500 days to carry out the field investigation, and the general change laws of lateral pressure and pile bending moment versus local daily rainfall were obtained. The results show that the effect of rainfall on the moisture content of backfill behind the wall decreases with depth. The performance of sheet-pile retaining structure is sensitive to the intensity of rainfall. The arching effect is reduced significantly by employing a series of sheet behind piles. The lateral pressure behind the sheet exhibits a single-peak distribution. The turning point of the horizontal swelling pressure distribution is correlated with the self-weight pressure distribution of soil and the variation of soil moisture content. The measured pile bending moment is approximately 44% of the ultimate pile capacity, which indicates that the sheet-pile retaining structure is in a stable service condition with enough safety reserve.

• Journal of the Korea Convergence Society
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• v.11 no.1
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• pp.41-50
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• 2020

This paper analyzed leadership behavior and employee performance through empirical analysis method based on AMO theory. In this study, the ability of the leader (A), task motivation (M), and opportunity (O) were chosen as factors to analyze the relationship between transformative leadership and job performance of the subordinate staff, and the self-efficiency (O) and intrinsic motivation (M) were selected at the individual level and team atmosphere (O) at the organizational level to build a research model. 507 valid data were obtained from the survey and statistical analysis was conducted using SPSS23. Studies have shown that transformative leaders have a significant impact on employee performance. This study provides research results of empirical theory to understand the behavior of the leader in the performance of the employees and also suggests implications for the management of the company's human resources.

• The Korean Journal of Food And Nutrition
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• v.25 no.3
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• pp.650-655
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• 2012

This purposes of this study were to explain consumer attitudes and purchasing behaviors towards agricultural products using a social network service and to determine the influencing factors such as experience, technology ability, innovation, self-efficacy, perception of usefulness, perception of trust, attitude, purpose of purchase and individual characteristics on them. We analyzed the survey data set, using the 'logit model', 'simultaneous equation model', and 'LISREL-Type model' In this study, the results obtained are summarized as follows. The result for the comprehensive statement of "Trust" was the biggest influence on the purchase agricultural products using the social network service. Therefore, in order to expand agricultural e-commerce using SNS, trust should be to the fore of marketing and publicity campaigns, in order to promote and stabilize the market.

• Journal of Korea Society of Digital Industry and Information Management
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• v.15 no.3
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• pp.149-173
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• 2019

Software education is inevitable for the success of the Fourth Industrial Revolution, and university education also requires innovation to cope with revolutionary change of the society. The number of students seeking employment in the IT field is steadily increasing regardless of the major of the student. However, the existing software-related courses offered by universities or private educational institutions are limited. This paper analyzes the existing software curriculum of several major universities for non-IT major students. In addition, in-depth surveys by students at Seoul Theological University is conducted to figure out the demand for the advanced level computer science subjects. Finally, new software education curriculum is proposed to fulfill the needs of non-IT major students and to improve the employment rate of non-IT major students seeking tech companies. The new curriculum will help to cultivate intermediate level IT experts that bridge the gap between advanced level IT experts and primitive level computer technicians.

• Journal of Korean Tunnelling and Underground Space Association
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• v.21 no.2
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• pp.227-242
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• 2019

This paper presents a method to predict ground types ahead of a tunnel face utilizing operational data of the earth pressure-balanced (EPB) shield tunnel boring machine (TBM) when running through soil ground. The time series analysis model which was applicable to predict the mixed ground composed of soils and rocks was modified to be applicable to soil tunnels. Using the modified model, the feasibility on the choice of the soil conditioning materials dependent upon soil types was studied. To do this, a self-organizing map (SOM) clustering was performed. Firstly, it was confirmed that the ground types should be classified based on the percentage of 35% passing through the #200 sieve. Then, the possibility of predicting the ground types by employing the modified model, in which the TBM operational data were analyzed, was studied. The efficacy of the modified model is demonstrated by its 98% accuracy in predicting ground types ten rings ahead of the tunnel face. Especially, the average prediction accuracy was approximately 93% in areas where ground type variations occur.