• 한국비블리아학회지
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• 제33권1호
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• pp.259-277
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• 2022

본 연구는 외국인 유학생들의 웹 검색엔진을 사용한 정보검색행위를 분석하였다. 실험에 참가한 15명의 외국인 유학생들은 3가지 검색 태스크에 포함된 6개의 검색질문에 대한 답을 찾도록 하였으며, 각 태스크 별로 사전 설문지 작성, 검색 수행, 사후 설문지 작성으로 실험이 진행되었다. 검색 태스크의 특성에 따라 검색성과와 검색행동에는 차이가 있었으나 공통적으로 한국어의 유창성이 높은 참가자들의 검색 성과가 높은 것으로 나타났다. 그러나 검색주제에 관한 사전지식이 검색성과에 항상 영향을 미치는 것은 아닌 것으로 나타났다. 메뉴와 링크를 통하여 웹사이트를 탐색해서 답을 찾는 태스크의 경우, 정답이 포함된 웹페이지 앞에서도 정답을 간과하는 경우가 발견되었다. 또한 오답을 찾고 그것을 인지하지 못하는 경우도 있었다. 국내의 외국인 거주자들에게 정보를 제공하기 위해서는 비원어민들이 탐색하기에 용이한 웹사이트를 디자인하고 양방향 소통 수단이 소셜미디어를 사용하는 것이 필요하다고 제안되었다.

• 한국보건간호학회지
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• 제23권2호
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• pp.296-305
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• 2009

Purpose: The aim of this study was to examine body attitude, body mass index, and perceived stress among women's college students and decide the relationships among them. Method: A cross-sectional study design and convenient sampling method was utilized. Ultimately, 393 students participated in the study from October 8 to October 30, 2008. The measurements administered were comprised body attitude questionnaire and stress scale for college students and the students had filled out the questionnaires by themselves. The final data were analyzed with SPSS Win 16.0 statistics program, which was used to calculate the frequencies, percentages, ANOVA, and Pearson's correlations of the variables. Results: The major findings of this study were as follows; female students were mostly stressed by 'schooling task.' Stress scores were significantly different in accordance with spending money per month. Overall, significant differences were observed in body attitude scores according to each BMI group. There were significant relationships between body attitude, BMI, and perceived stress. Conclusion: Stress managements for women's college students should be developed and a program for modifying body attitude should be designed.

• Steel and Composite Structures
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• 제45권2호
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• pp.205-218
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• 2022

Proper calculation of splitting tensile strength (STS) of concrete has been a crucial task, due to the wide use of concrete in the construction sector. Following many recent studies that have proposed various predictive models for this aim, this study suggests and tests the functionality of three hybrid models in predicting the STS from the characteristics of the mixture components including cement compressive strength, cement tensile strength, curing age, the maximum size of the crushed stone, stone powder content, sand fine modulus, water to binder ratio, and the ratio of sand. A multi-layer perceptron (MLP) neural network incorporates invasive weed optimization (IWO), cuttlefish optimization algorithm (CFOA), and electrostatic discharge algorithm (ESDA) which are among the newest optimization techniques. A dataset from the earlier literature is used for exploring and extrapolating the STS behavior. The results acquired from several accuracy criteria demonstrated a nice learning capability for all three hybrid models viz. IWO-MLP, CFOA-MLP, and ESDA-MLP. Also in the prediction phase, the prediction products were in a promising agreement (above 88%) with experimental results. However, a comparative look revealed the ESDA-MLP as the most accurate predictor. Considering mean absolute percentage error (MAPE) index, the error of ESDA-MLP was 9.05%, while the corresponding value for IWO-MLP and CFOA-MLP was 9.17 and 13.97%, respectively. Since the combination of MLP and ESDA can be an effective tool for optimizing the concrete mixture toward a desirable STS, the last part of this study is dedicated to extracting a predictive formula from this model.

• 한국컴퓨터정보학회논문지
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• 제28권12호
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• pp.289-296
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• 2023

본 연구는 대학생들의 온라인 학습 경험에서 성공요인들을 수업 전, 수업 중, 수업 후 단계를 기반으로 파악하는 것을 목표로 한다. 대학생을 대상으로 설문조사를 실시하였으며, 총 95부의 설문지를 최종 분석에 활용하였다. 주요 분석 결과를 살펴보면, 수업 전 단계에서는 과업의 가치, 학업적 자기효능감, 그리고 통제에 대한 믿음이 중요한 요인으로 확인되었으며, 수업 중에는 상호작용이 중요한 요인으로 나타났다. 특히, 학업적 자기효능감과 상호작용은 수업 후 단계에서 학생들의 만족도에 유의미하게 영향을 미치는 주요 요인으로 밝혀졌다. 이러한 요인들을 이해하는 것은 효과적인 대학 온라인 수업의 설계 및 운영에 정보를 제공하여 학생 경험과 만족도를 개선하는데 도움이 될 것이다.

• 로봇학회논문지
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• 제18권4호
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• pp.392-402
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• 2023

The purpose of this study was to conduct an exploratory and descriptive survey study design to examine 1) the physical difficulty by care task, 2) overall occupation-related physical burden by the characteristics of caregivers and care receivers, and 3) the level of help by the use of care robots and devices among formal caregivers working in facilities for older adults. In this study, 308 formal caregivers working in facilities were recruited from 8 nursing homes and 5 geriatric hospitals between Aug. 2021 and Sept. 2022 in South Korea. There were significant differences in ADLs between nursing homes and geriatric hospitals: eating, dressing, hygiene, transfer to bed, transfer to the toilet and walking. For each care item, the items the caregivers had the most difficulty ranked first were bathing, excretion assistance, and mobility support. The difference in occupation-related physical burden according to general characteristics was found to have statistically significant differences in female and bad perceived health. Among the 205 caregivers who had experience using care robots and devices, pressure ulcer prevention was the most experienced one, and those also were the most helpful and exercise aids were the least helpful. In order to reduce the physical burden on care providers, it is necessary to develop and introduce a care robots centered on the care site. Furthermore, national level public support systems are required to enable facilities to actively utilize care robots and devices.

• 공학교육연구
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• 제26권6호
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• pp.3-18
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• 2023

The purpose of this study is to identify the difference between the current retention level and the required level of engineering students' career competency that they think they need based on their perceptions. Ultimately, the results of this study are used as basic data when designing the major/general education program and the curricular/extra-curricular career program. The task of this study is to identify the difference between the current retention level and the required level of engineering students' career competency. And based on this, it is to confirm the educational needs of engineering students for the career competency. For this purpose, literature research on career competency education in universities was reviewed in the theoretical background. Next, previous studies on career competency and sub-competence derived from career competency-related studies and detailed questions were analyzed. Based on this, an initial evaluation tool for career competency of engineering students was developed. Finally, through expert review, a career competency evaluation tool with a total of 43 items in 10 competency groups was developed. A career competency evaluation questionnaire was conducted for 197 engineering students who participated in the 2022 Engineering Education Festa, and as a result of the IPA analysis, 'global competency' was found to be the competency with the largest difference between importance and execution. Next, 'major job competency' and 'career development competency' appeared in order. Reflecting the results of this study, it is expected that mutually organic design of competency-based liberal arts curriculum and major curriculum that can cultivate global competency, major job competency, and career development capability will be carried out through learning activities and field practice.

• 한국BIM학회 논문집
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• 제13권3호
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• pp.1-11
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• 2023

In order to use BIM as a tool for improving the productivity and quality of products in the construction industry, a BIM model must be created from the design stage first. Infrastructure structures such as bridges and tunnels are mainly created based on three-dimensional alignment in the generation of BIM models. Especially, generation of BIM models based on three-dimensional linearity has high task difficulty and algorithms for automating BIM modeling for railway infra structures have been suggested in previous studies. This study improved the BIM modeling automation algorithm of railway infrastructures and developed a system based on the algorithm so that it can be easily used by ordinary users. The system was built as an add-in system of Autodesk's Revit. As an improvement first, it is possible to arrange different libraries for each pattern, enabling various uses. In addition, it can be created models of several members with a single process and the system can automatically places structures that are added periodically, such as Rock Bolt and Fore Polling. Finally, 3D length information and volume for each pattern are automatically calculated for more accurate 3D-based volume calculation. This study contributes to increasing user accessibility by building a BIM modeling automation algorithm into a system. The system is expected to improve the efficiency of BIM modeling creation of linear-based infra structures, including railway infrastructure.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제18권3호
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• pp.801-825
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• 2024

For Internet of Things, it is more preferred to have immediate access to environment information from sensor nodes (SNs) rather than from gateway nodes (GWNs). To fulfill the goal, mutual authentication scheme between user and SNs with session key (SK) negotiation is more suitable. However, this is a challenging task due to the constrained power, computation, communication and storage resources of SNs. Though lots of authentication schemes with SK negotiation have been designed to deal with it, they are still insufficiently secure and/or efficient, and some even have serious vulnerabilities. Therefore, we design an efficient secure authentication scheme with session key negotiation (eSAS2KN) for wireless sensor networks (WSNs) utilizing fuzzy extractor technique, hash function and bitwise exclusive-or lightweight operations. In the eSAS2KN, user and SNs are mutually authenticated with anonymity, and an SK is negotiated for their direct and instant communications subsequently. To prove the security of eSAS2KN, we give detailed informal security analysis, carry out logical verification by applying BAN logic, present formal security proof by employing Real-Or-Random (ROR) model, and implement formal security verification by using AVISPA tool. Finally, computation and communication costs comparison show the eSAS2kN is more efficient and secure for practical application.

• 융합경영연구
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• 제12권2호
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• pp.11-18
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• 2024

Purpose: The purpose of this study is to suggest the activation plan of the post-construction sales through the results of a survey on the perception of Seoul citizens and experts. Research design, data and methodology: The purpose of this study is to suggest the activation plan of the post-construction sales through the results of a survey on the perception of Seoul citizens and experts. Results: According to a survey of Seoul citizens' perceptions, 76.7% of Seoul citizens were well aware of post-construction sales and recognized that post-construction sales would reduce pre-sale speculation and confusion in the real estate market. Second, 73.6% of Seoul citizens were willing to buy houses through post-construction sales, and third, 79.6% of Seoul citizens recognized that a post-sale system was necessary. Experts' opinions generally responded to the expansion of the introduction of post-construction sales, saying, 'It is necessary for both the public and the private sectors'. Second, while experts say that there are also positive effects, negative effects such as polarization centered on large corporations, an increase in sales prices, and a decrease in housing supply are also concerned. Third, experts responded that 'diversification of financing methods' is the most important task in revitalizing the post-sale system. Conclusions: The policy implications are that it is necessary to mandate the post-construction sales in the long term, and that the quality assurance system needs to be supplemented even if the sale is promoted post-construction sales. In addition, private participation is essential to revitalize the post-construction sales, and government support such as initial financing, low-interest rates, and various financing measures should be sought to expand private participation.

• 방사선산업학회지
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• 제18권3호
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• pp.223-226
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• 2024

It is essential to precisely evaluate the expected dose (collective dose) before performing high-exposure tasks in nuclear power plants because those have a high potential to cause significant radiation exposure to workers. A dose evaluation method is to design the scenarios of high-exposure tasks using computational codes, which allows for the calculation of the expected collective dose. Although these computational scenarios are useful for estimating the expected radiation dose and establishing radiation protection plans, the calculated doses may not perfectly match the actual doses that workers receive during tasks due to differences between the scenario and the actual circumstances in the radiation fields. Therefore, this study presents a methodology for calculating correction factors to improve the accuracy of dose predictions from computational scenarios. This approach aims to make the predicted collective dose before the task closer to the actual dose received by workers, thereby enhancing radiation safety for personnel performing high-exposure tasks. Additionally, these correction factors will help accurately predict doses under various working conditions in the future, contributing to minimizing radiation exposure risks for nuclear power plant workers.