• Journal of the Korean Society for Railway
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• v.7 no.1
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• pp.32-36
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• 2004

Aluminum carbody for rolling stocks is light and perfectly recycled, but includes severe defects which are very dangerous to fatigue strength. Static load test has been performed up to date to assess structural safety of the carbody. However, static load test is not sufficient to evaluate fatigue strength of the carbody, because fatigue failure is caused by dynamic load. In this study, the established load test methods for carbody are described and the characteristics of the methods are discussed. Also, a testing method to simulate dynamic loading condition is proposed for evaluation of fatigue strength of the carbody. The results by the proposed testing method are compared with the results by the static load test and new findings are discussed.

• Journal of the Korean Society of Clothing and Textiles
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• v.22 no.4
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• pp.460-468
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• 1998

The purpose of this study were 1) to identify the differences between homosexual and heterosexual men in clothing behaviors(fashion leadership, preference for up-to-date style and sexual attractiveness), lifestyle and sex-role attitudes, and 2) to investigate the relation- ships between clothing behaviors and lifestyle and sex-role attitudes. The data was collected via self-administered questionnaires from 183 adult men(88 homosexual, 95 heterosexual men) living in Seoul, and was analyzed by factor analysis, t-test, correlations and multiple regressions. The result of this study were as follows: 1. Two factors of fashion leadership. were identified: fashion opinion leadership and fashion innovativeness. Four factors of lifestyle were identified: appearance awareness, self-confidence, authoritativeness, and achievement. 2. The result of t-test between homosexual and heterosexual men in clothing behaviors and psychological characteristics, homosexual men showed higher scores in fashion innovativeness, fashion opinion leadership, preference for up-to-date style, and appearance awareness of lifestyle characteristics. 3. From the result of analyzing the effects of psychological characteristics on 4 variables of clothing behaviors, appearance awareness of lifestyle characteristics was found to be the most influential factor for all the clothing behavior variables in both groups.

• The Korean Journal of Food And Nutrition
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• v.34 no.1
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• pp.132-136
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• 2021

The purpose of this study is to measure the levels of eluted and dissolved CO2, and CO, volatile organic substances and radiation composition of Cheongsong mineral water which were collected from November 2019 to July 2020 during the autumn, spring, and summer seasons at collection points located in the upper, middle and lower spring waters. Data of the upper, middle and lower spring waters include the following: the amount of eluted water (average value±standard deviation, mL/min) was 30.07±0.52, 15.03±0.16, 23.73±0.42, and the amount of CO2 gas was 1,000 ppm or more. In addition, there was no detection of CO or total volatile organic substances (TVOC) and the radiation dose was 0.08 to 0.13. μSv/h. A blank test value of 0.08 to 0.10 μSv/h, when compared with the median value, showed a high value of 0.02 μSv/h, and the uranium test results provided by the Cheongsong-gun Office were 0.0118 mg/L (date 2019.06.18) and 0.0091 mg/L (date 2020.06.04.) respectively, which was less than the permission limit of 0.03 mg/L. However, it is believed that further research using more precise devices is needed in order to guarantee the safety and health of the water.

• Child Health Nursing Research
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• v.30 no.2
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• pp.154-163
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• 2024

Purpose: This study is descriptive research aiming to identify factors influencing the stigma experienced by college students with coronavirus disease 2019 (COVID-19), focusing on COVID-19 pandemic stress, depression, and fear of negative evaluation as the main variables. Methods: An online survey was administered to 175 college students who had been diagnosed with COVID-19 from January to May 2022 and were enrolled in universities in Seoul, Cheongju, and Daegu, South Korea. The survey collected data on pandemic stress, depression, fear of negative evaluation, and stigma. The data were analyzed using the t-test, ANOVA, the Scheffe test, Pearson's correlation coefficients, and stepwise multiple regression in SPSS/WIN 26.0. Results: We analyzed differences in stigma scores based on general characteristics of the college students and found significant differences in stigma scores by age, major satisfaction, interpersonal satisfaction, date of COVID-19 confirmation, treatment modality, and recent subjective health condition. Factors influencing stigmatization were identified as COVID-19 pandemic stress, depression, date of COVID-19 confirmation, treatment modality, recent subjective health condition, and major satisfaction, with an overall explanatory power of 37.6%. Conclusion: This study is significant as it identifies emotional changes across various aspects of pandemic stress, depression, fear of negative evaluation, and stigma among college students who have been diagnosed with COVID-19. The findings of this study suggest the development of programs to reduce psychological distress and enhance mental health management skills among these students.

• Proceedings of the Korea Concrete Institute Conference
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• 1999.10a
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• pp.183-186
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• 1999

Up to date, it is difficult to estimate the consistence of properties on the epoxy liner in service time because an estimation of the long term environment-deterioration with aging has not been processed. In the study, the estimation on epoxy liner is carried by the physical test 7 rounds. There are the elongation the and the crack bridging test in the part of physical tests. An elongation test is carried out with epoxy membrane and a crack bridging test is carried out with specimen painted epoxy on concrete. The subjects of test and estimation are a containment quality system and a fibre-glass reinforced system. The materials of these systems are a Robber added Epoxy, a Silica added Epoxy, and a Fiber reinforced Epoxy. Ensuring the test data, properties of epoxy liner was estimated and the change of properties was predicted on epoxy liners.

• Journal of the Korean Society for Railway
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• v.10 no.4
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• pp.388-392
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• 2007

A new dielectric test on main relays of electric traction vehicles, the partial discharge(PD) test, is proposed. The PD test will not affect the insulation performance of specimen during the test and provide much more detailed information on insulation, the types of defects, and so on. Insulation performance of relays is estimated by discharge inception voltage(DIV), discharge extinction voltage (DEV), and apparent charge as a function of test voltage and time. Three main relays of different manufacturing date were estimated by applying AC voltage with three patterns in ranges of $0{\sim}1,200[V]$. From the results, we could estimate insulation state and which types of defects exist in them.

• The Journal of Korean Medical History
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• v.34 no.1
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• pp.47-57
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• 2021

The appointment of medical officials during the Joseon Dynasty was conducted through medical testing. To date, most of the research done on these tests has focused on the testing system and its formal qualities without any study of actual test cases. This paper considers the significance of the medical examination format and contents through a test paper contained in the book "Joseonuihaksageupjilbyeongsa (朝鮮醫學史及疾病史)" by MikiSakae (三木榮). The literature confirms that the medical exam paper is the same format as "Gangji (講紙)," and that the test format called "Gangseo (講書)" is a very high-level test. Therefore, analysis of the case suggests that the format of the medical examination reflects the demand for high-quality medical learning for applicants. This consideration is meaningful because existing medical test papers are very rare.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.20 no.44
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• pp.135-151
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• 1997

In this paper, we propose a simple and relatively efficient heuristic method to determine job sequencing in the flow-shop considering multiple criteria such as processing time, due date and cost. The proposed method is applicable to the flow- shop where the jobs are released simultaneously and their processing sequence is predetermined and not changed until the whole jobs are processed. To develop this method, we mixed and modified some well-known multi-attribute decision heuristics such as the simple linear weighting scheme, the lexicographic rule and the 'elimination by aspect' rule. Some computer simulations were conducted to test the efficiency of the proposed method and it has been compared with the SWPT (Shortest Working Processing Time) rule and EDD (Earliest Due Date) rule. The results show that our method is as effective as the traditional ones in terms of mean flow time, tardiness, makespan, cycle time, machine utilization, etc., and proved to be much simpler and more flexible to be used in real situations.

• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1197_1198
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• 2009

The development of Technology study for preventing of accident and reducing the risk through the intelligence of level crossing is provide the detection of stopped car at railway crossing with the most advanced intelligence technology such as sensor, computer, communication and date processing and transmit to the operational staff on broad for reaction or make the train stopped automatically through the connection with train. Also this study include that showing the situation of crossing railway when the train is approached and prevent the accident and reduce the risk through the connection of road transit signal system. On this study is performed the test through the date from spot level crossing and the development of video detection algorism for stopped road transit vehicle at level crossing with intelligent system.

• Management Science and Financial Engineering
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• v.13 no.1
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• pp.93-113
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• 2007

In the previous research, we considered a logistics brokerage problem with the objective of minimizing total transportation lead time of freights in a logistics e-marketplace, in which a logistics brokerage agent intermediates empty vehicles and freights registered by car owners and shippers [7]. However, in the logistics e-marketplace, transportation due date tardiness is more important than the transportation lead time, since transportation service level is critically determined by whether the due date is met or not. Therefore, in this paper, we deal with the logistics brokerage problem with the objective of minimizing total tardiness of freights. Hungarian method based matching algorithms, real time matching(RTM), periodic matching(PM), and fixed matching(FM), are used for solving the problem considered in this paper. In order to test performance of the proposed algorithms, we perform computational experiments on a various problem instances. The results show that the waiting-and-matching algorithms, PM and FM, also give better performance than real time matching strategy, RTM, for the total tardiness minimization problem as the algorithms did for the total lead time minimization problem.