• Title/Summary/Keyword: Result Analysis and Evaluation

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Evaluation on Structural Stability of Railway Level Crossing System using Rubber Panel by High Speed Train Gust (고무보판 패널 철도건널목 시스템의 고속열차 풍하중에 대한 구조 안정성 분석)

  • Choi, Jung-Youl;Kim, Sang-Jin;Shin, Tae-Hyoung;Chung, Jee-Seung
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.2
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    • pp.355-360
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    • 2019
  • In this study, the structural stability of the railway level crossing system using rubber panel for high speed lines was investigated by applying the specification for wind load conditions (Train gust) of high speed train (300km/h and 360km/h). A finite element analysis using three-dimensional modeling was carried out by applying the field conditions that was installed with the complicated configuration of the rubber plate panel system. As a result of this study, the structural stability of the rubber plate panel system for high speed train gust was analytically verified.

The Optimal Tracking Error of Active Stock Fund by Smart Beta Strategy (스마트 베타 전략에 따른 액티브 주식형 펀드의 최적 추적오차)

  • Jae-Hyun Lee
    • Asia-Pacific Journal of Business
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    • v.13 no.4
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    • pp.163-175
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    • 2022
  • Purpose - This study introduces a methodology for finding the optimal tracking error of active stock funds. Tracking error is commonly used in risk budgeting techniques as a concept of cost for alpha creation. Design/methodology/approach - This study uses a post-optimal smart beta portfolio that maximizes alpha under the given tracking error constraint. Findings - As a result of the analysis, the smart beta strategy that maximized alpha under the constraint of 0.15% daily tracking error shows the highest IR. This means the maximum theoretically achievable efficiency. In this regard, a fixed-effect panel regression analysis is conducted to evaluate the active efficiency of domestic stock funds. In addition to control variables based on previous studies, the effect of tracking error on alpha is analyzed. The alpha used in this model is calculated using the smart beta portfolio according to the size of the constraint of the tracking error as a benchmark. Contrary to theoretical estimates, in Korea, the alpha performance is maximized under a daily tracking error of 0.1%. This indicates that the active efficiency of domestic equity funds is lower than the theoretical maximum. Research implications or Originality - Based on this study, it is expected that it can be used for active risk management of pension funds and performance evaluation of active strategies.

Efficiency analysis of the community welfare centers for people with disabilities using data envelopment analysis (자료포락분석을 활용한 장애인복지관의 효율성 분석)

  • Choi, Kyoungho;Shin, Hyun-Uk
    • Journal of the Korean Data and Information Science Society
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    • v.26 no.1
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    • pp.111-121
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    • 2015
  • Until now, the operation of community welfare centers for people with disabilities has brought a positive or a generous awareness. Nevertheless, in order to obtain a wide range of welfare outcomes efficiently, the imperative step in rehabilitation researches is to determine whether reasonable and scientific services are being provided to people with disabilities in rehabilitation centers. The purpose of this study was to analyze efficiency and productivity of 176 community welfare centers for people with disabilities. As a result, average technical efficiency for community welfare centers for people with disabilities was 0.4488; pure technical efficiency and scale efficiency was 0.6040 and 0.7080, respectively. The major conclusions of this study were as follows. First, applying the technical efficiency analysis, DMU2, DMU3, DMU8, DMU9, DMU11, DMU13, DMU14 were shown above average. It seems to have a regard for political elements in accordance with the regional social and economic differences. Second, as a result of scale efficiency analysis, the inefficient community welfare centers for people with disabilities such as DMU1, DMU5, DMU12, DMU16 are required to improve the number of employees, revenue, facility area. Finally, this study is expected to be an effectiveness analysis and performance evaluation for the rehabilitation services.

A Comparative Study of the Efficiency among Korea, Chinese, and Japanese Ports (한·중·일 항만효율성 비교연구)

  • KOO, Jong-soon;LEE, Jung-sun;JEON, Dong-hwa
    • The Journal of shipping and logistics
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    • v.27 no.3
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    • pp.457-474
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    • 2011
  • The aim of this study is to analyze the efficiency of major ports in Northeast Asia such as Korea, China and Japan. For the empirical analysis, we tried to apply the data envelopment analysis (DEA), which is an efficiency evaluation model based on mathematical programming theory, and we also established a model to Northeast Asian ports. In our opinion, DEA analysis which involves multiple inputs as well as multiple outputs in its efficiency valuation makes analysis more suitable for port efficiency measurement because ports produce a number of different outputs. In this paper, we attempted to analyze the relative efficiency of 27 ports (5 Korean ports, 13 Chinese ports, 9 Japanese ports) through DEA-CCR, DEA-BCC models. According to the result, Chinese ports are relatively efficient than Korean and Japanese ports. The result of the analysis shows that 7 Chinese ports are efficient in DEA-CCR model in 2009, but in DEA-BCC model 8 Chinese ports and 1 Koran port are efficient. Most of inefficient ports have a value closed to 1 in efficiency for scale, it means that the reason of inefficiency is caused from the technical aspect. Furthermore, we also verified that there exists excess of input in Korean and Japanese ports than Chinese ports.

Evaluating the Usefulness of Diagnosis through 3D Printing Technology (3D프린팅 기술을 이용한 심혈관 질환 진단의 유용성 평가)

  • Park, Chun-Kyu;Kim, Jung-Hun
    • Journal of the Korean Society of Radiology
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    • v.15 no.5
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    • pp.691-696
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    • 2021
  • In order to prevent and treat a patient's disease, the anatomical structure of the lesion through medical imaging is one of the important processes. However, there is a limit to the image displayed on the screen, so many studies are underway to overcome this by using 3D printing technology. To this end, this study implemented a three-dimensional cardiovascular model using actual patient image data, printed it out using a 3D printer, and conducted a usefulness test on current medical professionals. As a result of the usefulness evaluation, when the questionnaire conducted by a total of 5 people was converted to the Likert scale, the average value of all items showed a high result of 4.83 points, and the result of the cross-analysis was (P) = 10.000 (0.265), which was equally positive among all the questionnaires survey results were presented. Based on the results, it is expected that 3D printing technology will help advance medical technology.

Perceptions and practices of commensality and solo-eating among Korean and Japanese university students: A cross-cultural analysis

  • Cho, Wookyoun;Takeda, Wakako;Oh, Yujin;Aiba, Naomi;Lee, Youngmee
    • Nutrition Research and Practice
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    • v.9 no.5
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    • pp.523-529
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    • 2015
  • BACKGROUND/OBJECTIVES: Commensality, eating together with others, is a major representation of human sociality. In recent time, environments around commensality have changed significantly due to rapid social changes, and the decline of commensality is perceived as a serious concern in many modern societies. This study employs a cross-cultural analysis of university students in two East Asian countries, and examines cross-cultural variations of perceptions and actual practices of commensality and solo-eating. SUBJECTS/METHODS: The analysis was drawn from a free-list survey and a self-administrative questionnaires of university students in urban Korea and Japan. The free-listing survey was conducted with a small cohort to explore common images and meanings of commensality and solo-eating. The self-administrative questionnaire was developed based on the result of the free-list survey, and conducted with a larger cohort to examine reasons and problems of practices and associated behaviors and food intake. RESULTS: We found that Korean subjects tended to show stronger associations between solo-eating and negative emotions while the Japanese subjects expressed mixed emotions towards the practice of solo-eating. In the questionnaire, more Korean students reported they prefer commensality and tend to eat more quantities when they eat commensally. In contrast, more Japanese reported that they do not have preference on commensality and there is no notable difference in food quantities when they eat commensally and alone. Compared to the general Korean cohort finding, more proportion of overweight and obese groups of Korean subjects reported that they tend to eat more when they are alone than normal and underweight groups. This difference was not found in the overweight Japanese subjects. CONCLUSION: Our study revealed cross-cultural variations of perceptions and practices of commensality and solo-eating in a non-western setting.

Sensitivity Analysis and Parameter Evaluation of a Distributed Model for Rainfall-Runoff-Soil Erosion-Sediment Transport Modeling in the Naesung Stream Watershed (내성천 유역의 강우-유출-토양침식-유사이송 모의를 위한 분포형 모형의 민감도 분석 및 매개변수 평가)

  • Jeong, Won Jun;Ji, Un
    • Journal of Korea Water Resources Association
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    • v.47 no.12
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    • pp.1121-1134
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    • 2014
  • The distributed watershed model of rainfall-runoff-soil erosion-sedimen transport was constructed for the Naesung Stream Watershed with high potentiality and risk of sediments produced by soil erosion. The sensitivity analyses of roughness coefficient and hydraulic conductivity which affected the modeling results of runoff and sediment concentration were performed in this study. As a result, the change of the roughness coefficient for the forest area from 0.4 to 0.45 did not affect the change in runoff and stream discharge and the average value and range of sediment concentration were also insignificantly increased with few difference. As a result of the sensitivity analysis of the hydraulic conductivity, the total amount of runoff and maximum runoff were gradually increased as the hydraulic conductivity was reduced. In the case of sediment concentration modeling, the average and the range of sediment concentration for all stations were increased as the hydraulic conductivity was decreased. For the Hyangseok Station, in case of the hydraulic conductivity reduced by 50%, the simulation result of sediment concentration was most similar to the estimated value by the sediment rating curve.

The Quality Characteristics of Backsulgi with Dough Ripe Stage Rice and Yellow Ripe Stage Rice (호숙기와 황숙기 멥쌀을 첨가한 백설기의 품질특성)

  • Park, So-Ra;Lee, Jeung Hee
    • Korean journal of food and cookery science
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    • v.29 no.4
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    • pp.353-359
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    • 2013
  • The effect of the addition of dough ripe stage rice (DRSR) and yellow ripe stage rice (YRSR) on the quality characteristics of Backsulgi was investigated. The DRSR and YRSR addition ratio of 30% was selected by preliminary sensory evaluation study for which backsulgi was prepared with DRSR added to full ripe stage rice (FRSR, control) as the weight ratio of 0, 20, 30 and 50%. The pasting properties of 30% added DRSR and YRSR flours, analyzed with rapid viscosity analyzer (RVA), were compared with FRSR flour. The RVA values of holding, breakdown, final viscosities were higher in 30% DRSR and YRSR flours than in control. Backsulgi prepared with 30% DRSR and YRSR showed lower moisture content along with higher greenness and yellowness than control. As a result of analysis with texture analyzer, adhesiveness, springiness, cohesiveness, chewiness and resilience were lower in backsulgis with 30% DRSR and YRSR than in control. In the sensory evaluation, backsulgis with 30% DRSR and YRSR were assessed as having more intensive green color, and more greenish and delicious taste than control. Furthermore, backsulgi with 30% DRSR showed higher score of overall acceptability than 30% YRSR (p<0.05), and not significantly different score with control (p>0.05). Therefore, the addition of 30% DRSR could give favorable color and flavor to backsulgi.

The Self-Perception and Science Teaching Implementation of Elementary School Teacher Aiming for Student-centered Inquiry Classes -Focusing on RTOP Analysis of the Elementary School 'Temperature and Heat' Unit- (학생 중심 탐구수업을 지향하는 초등교사의 과학수업에 대한 자기인식과 실행 -초등학교 '온도와 열' 단원에 대한 RTOP 분석을 중심으로-)

  • Chaeyeon Shin;Hyojoon Kim
    • Journal of Science Education
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    • v.47 no.1
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    • pp.88-106
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    • 2023
  • This study aims to investigate the disparity between the teacher's perception of student-centered inquiry classes and the actual implementation of such practices. Specifically, we compared an elementary science teacher's self-perception of her science lessons with the observers' evaluation using the Reformed Teaching Observation Protocol (RTOP) of the "Temperature and Heat" unit. Research data were collected through classroom teaching survey, interview, and science lessons video which were analyzed using the RTOP. As a result of the study, the teacher recognized that she was practicing inquiry-oriented/student-centered classes, but the results judged by the RTOP score were found to be transitional/student-affected classes by a slight difference. Teacher H planned and practiced classes based on a high understanding and content knowledge of the curriculum and created a science classroom culture that promotes active interaction among students as well as students and teachers. However, teacher-led aspects were still emphasized in teaching design and implementation, and the project theme and content were inappropriate to improve the quality of students' science inquiry experience. In the end, the slight difference between teacher's perception of inquiry-oriented/student-centered classes and actual implementation is related to how student-centered "lesson design" is and how to plan and implement classes supported by "procedural knowledge" for students' experience in the science inquiry process. These results indicate that the teacher's self-evaluation alone is not enough to determine whether the teacher's intentions and efforts are actually being implemented, and that it is necessary to conduct objective analysis, evaluation, and discuss the results of science classes by the external observers.

A Study on Driving Safety Evaluation Criteria of Personal Mobility (퍼스널 모빌리티(Personal Mobility)의 주행안전성 평가지표 연구)

  • Park, Bumjin;Roh, Chang-gyun;Kim, Jisoo
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.17 no.5
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    • pp.1-13
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    • 2018
  • Divers types of Personal Mobility(PM) are appeared on the market after the Segway is introduced. PMs have propagated very rapidly with their ease of use, and accidents related with PM show a sudden increase. Many studies on the PM are performed as its trend, but dring safety of passengers are excluded. In this study, criteria which can be adopted for PM's driving safety evaluation are reviewed. Also result of driving safety evaluation on 3 types of PM(wheel chair, kickboard, scooter(seating/standing) and walking using deducted criteria is given. COG(Center of the gravity) and SM(Stability Metric) are finally selected two criteria among many of them used in other fields. COG indicates how the center of mass deviates from the direction of the gravity. SM is a normalized value of generated force when PM moves as internal force, angular momentum, and ground reaction force. 0 means stop, and negative value means rollover, so it can be used for safety evaluation of PM. Average and standard deviation of measurement are standard of safety on the COG analysis. Wheel chair is the most safe and kickboard is the most unstable on the COG analysis. Wheel chair is also ranked as top safe on the SM analysis. Among two riding types(seating and standing) on the scooter, seating type is evaluated more safer than standing type. It is proposed that more various type of PMs are need to get safety evaluation for drivers and devices themselves together.