• Journal of Preventive Medicine and Public Health
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• v.42 no.4
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• pp.223-230
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• 2009

Objectives : This study was conducted to validate self-reported smoking among high school students using urinary cotinine. Methods : A self report of smoking behavior was collected together with urine sample for cotinine analysis from 130 male and female students in two vocational high school students in November, 2007. Validity and agreement between self-reported smoking and urinary cotinine was analyzed with STATA 9.0 for different definitions of current smokers, and frequent and daily smokers. Urinary cotinine concentration was measured by the DRI Cotinine Assay for urine (Microgenics Corp., Fremont, CA) on Toshiba 200FR. The cut-off point of urinary cotinine was 50 ng/dl. Results : The concentrations of urinary cotinine were significantly different according to the frequency and amount of smoking. Sensitivity and specificity was 90.9% and 91.8% respectively, and the Cohen s kappa value was 0.787 among the current smokers who smoked at least one day during one month preceding the survey. The comparable high sensitivity, specificity, and kappa value were shown also among the other definitions of current smokers, that is, subjective smokers, and weekly smokers. Conclusions : The results showed the high validity of self-reported smoking among high school students. However, due to the small sample size and limitation of the participants, it is cautious to generalize the results to overall high school students.

• Journal of Information Processing Systems
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• v.15 no.2
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• pp.331-343
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• 2019

Dynamic thermal rating of the overhead transmission lines is affected by many uncertain factors. The ambient temperature, wind speed and wind direction are the main sources of uncertainty. Measurement uncertainty is an important parameter to evaluate the reliability of measurement results. This paper presents the uncertainty analysis based on Monte Carlo. On the basis of establishing the mathematical model and setting the probability density function of the input parameter value, the probability density function of the output value is determined by probability distribution random sampling. Through the calculation and analysis of the transient thermal balance equation and the steady- state thermal balance equation, the steady-state current carrying capacity, the transient current carrying capacity, the standard uncertainty and the probability distribution of the minimum and maximum values of the conductor under 95% confidence interval are obtained. The simulation results indicate that Monte Carlo method can decrease the computational complexity, speed up the calculation, and increase the validity and reliability of the uncertainty evaluation.

• Structural Engineering and Mechanics
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• v.86 no.5
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• pp.673-686
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• 2023

Determining the properties of pile from cone penetration test (CPT) is costly, and need several in-situ tests. At the present study, two novel hybrid learning models, namely PSO-RF and HHO-RF, which are an amalgamation of random forest (RF) with particle swarm optimization (PSO) and Harris hawks optimization (HHO) were developed and applied to predict the pile set-up parameter "A" from CPT for the design aim of the projects. To forecast the "A," CPT data along were collected from different sites in Louisiana, where the selected variables as input were plasticity index (PI), undrained shear strength (S_u), and over consolidation ratio (OCR). Results show that both PSO-RF and HHO-RF models have acceptable performance in predicting the set-up parameter "A," with R² larger than 0.9094, representing the admissible correlation between observed and predicted values. HHO-RF has better proficiency than the PSO-RF model, with R² and RMSE equal to 0.9328 and 0.0292 for the training phase and 0.9729 and 0.024 for testing data, respectively. Moreover, PI and OBJ indices are considered, in which the HHO-RF model has lower results which leads to outperforming this hybrid algorithm with respect to PSO-RF for predicting the pile set-up parameter "A," consequently being specified as the proposed model. Therefore, the results demonstrate the ability of the HHO algorithm in determining the optimal value of RF hyperparameters than PSO.

• Nuclear Engineering and Technology
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• v.51 no.3
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• pp.853-859
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• 2019

A comprehensive study of photon interaction features has been made for some alloys containing Pd and Ag content to evaluate its possible use as alternative gamma radiations shielding material. The mass attenuation coefficient (${\mu}/{\rho}$) of the present alloys was measured at various photon energies between 81 keV-1333 keV utilizing HPGe detector. The measured ${\mu}/{\rho}$ values were compared to those of theoretical and computational (MCNPX code) results. The results exhibited that the ${\mu}/{\rho}$ values of the studied alloys are in the same line with results of WinXCOM software and MCNPX code results at all energies. Moreover, Pd75/Ag25 alloy sample has the maximum radiation protection efficiency (about 53% at 81 keV) and lowest half value layer, which shows that Pd75/Ag25 has superior gamma radiation shielding performance among the other compared alloys.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2023.11a
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• pp.135-136
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• 2023

The Vocational Rehabilitation Center Expansion Project, with a budget of 15.3 billion KRW, transformed an existing facility into a more eco-friendly, user-friendly, and publicly accessible space. The project involved expanding the building from a basement and two above-ground floors to a basement and six above-ground floors, addressing the shortage of facilities for people with disabilities while promoting eco-friendliness. Design concepts included eco-friendly MASS, improvements to the existing building, social adaptability, and user-centric evacuation measures. Value Engineering (VE) and technical reviews led to proposals for cost reduction and functionality enhancement. Completed in September 2019, the project, renamed "Se-um Center," now hosts seven disability welfare facilities, serving as a vital infrastructure improving the lives of individuals with disabilities in the local community.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.9 no.5
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• pp.255-265
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• 2014

Job creation is foundation for wealth creation of the individual personal and important social activities that can solve the problem through increased economic activity and decreased population of unemployment. Jab creation contributes to the best way to solve social problems by acting as mediator of economic stability by establishment to a virtuous cycle between growth and employment and providing the foundation for sustainable growth. In this study, the factors affect on entrepreneurship and professional values were studied on the vocational personality types of student. As a result of this study, Vocational personality types positive commitment to the entrepreneurship. Realistic, exploratory, artistic, social, persuasive and customary factors also positive commitment the entrepreneurship. Vocational personality types positive commitment to the professional values. Professional values positive commitment to the entrepreneurship. However, the professional value factors which are self-actualization, safety, power, independence, community service and leadership depend on entrepreneurship. Therefore, in order to improve the success rate of student start ups, the appropriate selection of optional items of start ups and entrepreneurship education at the right time to establish a business plan by the type of vocational personality types and should provide the opportunity to encounter.

• 대한공업교육학회지
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• v.39 no.2
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• pp.101-121
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• 2014

The study aims to develop the NCS based vocational curriculum model for the practical and creative human resources. For effectiveness of the study, the study consists of literature studies of both domestic and international, contents analysis, case study, expert(9samples) consultation and review, and in-depth-interview of the three advisory members. The validity of the developed model is analyzed through mean, standard deviation and contents validity ratio(CVR). The main results of the model development in our study are as follow. First, our NCS based vocational curriculum model for the practical and creative human resources is developed with the analyses of NCS development manuals, training standard utilization and training curriculum organization manuals, NCS learning module development manual and case studies, NCS research report, NCS based curriculum pilot development resources directed toward the high schools and vocational school as well as the domestic and international literature study on career training model like NCS. Second, based on the findings of our analysis in combination with the findings from the consultations with the expert and advisory committee, total 19 sub-factors of each step and domain are extracted. The sub-factors of domain in step 1 are the competency unit, definition of competency unit, competency unit element, performance criteria, range of variable, guide of assessment, key competency; in step 2, they are subject title, subject objectives, chapter title, chapter objectives, pedagogical methods, assessment methods and basic job competence; and in step 2, they are NCS based subject matrix table, NCS based subject profile, NCS based job training curriculum table, NCS based subjects organization flowchart, NCS based job training operation plan. Third, the final model including step 3 NCS based subject profile are developed in association with the linked organizational sub-factors of step 1 and step 2. Forth, the validity tests for the final model by the step and domain yield the mean 4.67, CVR value 1.00, indicating the superior validity. Also, the means of each sub-factors are all over 4.33 with the CVR value 1.00, indicating the high validity as well. The means of the associated organizations within the model are also over 4.33 with the CVR value of 1.00. Standard deviations are all .50 or lower which are small. Fifth, based on the validity test results and the in-depth-interview of the expert and advisory committee, the model is adjusted complemented to establish final model of the NCS based vocational curriculum for the practical and creative human resources.

• Journal of the Korean Society of Clothing and Textiles
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• v.32 no.1
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• pp.110-122
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• 2008

The objectives of this study were to identify the work values of the college students, and to verify the relationship between demographic variables and the work value inventory. Data were collected from college students majoring clothing and textiles(N=307). Convenient sampling was performed. The work value inventory used in this study was modified on the one designed by Meitus. The data were analyzed by factor analysis, t-test and F-test. The findings of this study were as follows : First, as a result of factor analysis, dimensions of work value consists of 8 factors, including income, achievement, status, social contribution, stability, responsibility, capability and vocational contribution. Second, job experience, grade and parent's educational background and occupation were the major variables determining students' work values.

• Asia pacific journal of information systems
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• v.33 no.2
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• pp.342-366
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• 2023

This study attempts to extend the customer value - customer satisfaction - customer loyalty framework by introducing key constructs of scarcity messages as a major environmental stimulus and the urge to buy impulsively as its response in the context of group-buying social commerce, across countries including Korea and China. More specifically, this study proposes that scarcity messages influence customers' value perception (i.e., utilitarian value and hedonic value) and thereby influencing customer satisfaction and further customer loyalty. Moreover, the study suggests that scarcity messages and utilitarian and hedonic values arouse the urge to buy impulsively. In the Korean sample, the results show that scarcity messages increase both utilitarian and hedonic values as well as the urge to buy impulsively, which in turn leads to customers' satisfaction and further loyalty. Besides, customer satisfaction is determined by utilitarian value, not hedonic value. In the Chinese sample, utilitarian value-related relationships are insignificant. More specifically, scarcity messages only influence hedonic value which increases the urge to buy impulsively. Besides, customer satisfaction is determined by both utilitarian and hedonic values, but not by the urge to buy impulsively.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.5
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• pp.436-444
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• 2017

The purpose of this study is to investigate the research trends related to work rehabilitation in the field of occupational therapy based on studies published in the American Journal of Occupational Therapy (AJOT). Thirty five articles in the AJOT from January, 2000, to June, 2016, were reviewed. Descriptive statistics were used to classify the articles according to their study methodology, evidence level, study subjects, and so on. When they were categorized according to the study methodology, eight studies (22.9%) were published as review or meta-analyses and 7 studies (20%) as qualitative and naturalistic inquiries. Group comparison/correlational and experimental outcome methods were used in 4 studies (11.4%). 3 studies (8.6%) were conducted using a case study/single-subject design or survey. 14 studies (40.0%) were evidence level V ones and 7 studies (33.3%) dealt with mental illness. When they were classified according to the study subjects, 25 studies (71.4%) were related to the work-rehabilitation process and 10 studies (28.6%) were related to the meaning and value of work. Through this study, we were able to determine the main research trends, study methodology, study participants, and evidence level related to vocational rehabilitation in the field of occupational therapy. Additionally, it is necessary to examine studies in the field of vocational rehabilitation, which have a high level of evidence and include various kinds of participants, as well as the process of vocational rehabilitation.