• Title/Summary/Keyword: Conduct

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A Study on the Snap-through Behaviour According to the Initial Deflection Shape of Plate Members (초기처짐형상에 따른 판부재의 천이거동에 관한 연구)

  • 고재용;이계희;박주신
    • Proceedings of the Computational Structural Engineering Institute Conference
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    • 2003.10a
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    • pp.348-356
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    • 2003
  • Recently, the buckling is easy to happen a thin plate and High Tensile Steel is used at the steel structure and marine structure so that it is wide. Especially, the post-buckling is becoming important design criteria in the ship structure to use especially the High Tensile Steel. Consequently, it is important that we grasp the conduct post-buckling behaviour accurately at the stability of the ship structure or marine structure. In this study, examined closely about conduct and snap-through behaviour after initial buckling of thin plate structure which apply compressive load according to various kinds initial deflection shape under all edges simply supported condition that make by buckling formula in each payment in advance rule to place which is representative construction of hull. Analysis method is F.E.M in used ANSYS program and complicated nonlinear behaviour to analyze such as secondary buckling with snap-through behaviour. Nonlinear buckling control is applied between newton-raphson method and arc-length method in this study

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The Peer Competence of Children in Poverty (빈곤층 아동의 또래역량)

  • Lee, Eun Ju;Lee, Jae Yeon
    • Korean Journal of Child Studies
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    • v.17 no.2
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    • pp.195-206
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    • 1996
  • The purpose of this study was to observe differences in peer competence by children's personality and to investigate the relationship between peer competence and characteristics of children from poor families. The subjects were 79 parents and their 4- to 6-year-old children at a kindergarten in Seoul. The instruments were Iannotti's facial drawings cards, vignettes, "roster and rating" the Family Environment Scale (FES) and the Family Expressiveness Questionnaire (FEQ). The main results of this study were that girls from poor families had higher levels of peer competence than boys. There was a significant correlation between the peer competence of the children in poverty and family characteristics. The children's gender, knowledge of emotion, and mother's negatively dominant conduct were the factors that indicated children's behavior in peer competence. Family conflict and mother's emotional conduct did not relate to children's knowledge of emotion.

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A Study on Airport Security Performance Improvement based on Risk Management Concept (위험관리 개념에 근거한 항공보안업무 합리화 방안 연구)

  • Hwang, Kyung-Chul;Yoo, Kwang-Eui
    • Journal of the Korean Society for Aviation and Aeronautics
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    • v.20 no.2
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    • pp.47-57
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    • 2012
  • The strengthened aviation security measurements caused by increased terror threat all around the world have air passengers annoyed by uneasy treatment and some delayed process. The service level of air travel and competitiveness of airlines industry has been weakened also. The aviation security process is mainly conducted at an airport. The threat level of airport is not usually same airport to airport, and the quality of aviation security activity is neither same. However, ICAO requires every international airport to conduct similar process to ensure aviation security without considering situational difference of each airport. The paper has objectives to develop reasonable security measurements based on risk management concept. It studied the ways of achieving target level of security of an airport, considering the threat situation of the airport and its ability to conduct security procedures.

Development of Underwater ROV for Crack Inspection of River Facilities (하천 시설물 균열 검사를 위한 수중 ROV 개발)

  • Seong, Ho-Hwan;Lee, Jang-Myung
    • IEMEK Journal of Embedded Systems and Applications
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    • v.16 no.4
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    • pp.129-136
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    • 2021
  • River facilities and port structures require a regular inspection and diagnosis due to obsolescence. Currently, most river facilities are undergoing indirect inspection and diagnosis by divers. The underwater inspections are not feasible due to safety issues of divers and restrictions on working hours and environment. To overcome these issues, it is intended to conduct inspections of river facilities using underwater drones. In this research, an underwater ROV (Remote Operated Vehicle) has been developed, which is a kind of drone with propellers. As a key device of this research, an injection device has been attached to the underwater drone to conduct an operation test, a stable operation test of an underwater drone, and a test of attached sensors. The river facility inspection can be carried out optimally using the hovering control of the drone and injection systems. With the developed ROV system, hovering test and injection test have been performed to verify the feasibility of this development.

Process Development and Analysis of Diorefinery for the Coproduction of 1,3-Butadiene and Butene Oligomer (1,3-부타디엔과 부텐 올리고머 공동 생산을 위한 바이오 정유 공정의 설계 및 분석)

  • AHN, BYEONGCHAN;PARK, JIN-NAM;WON, WANGYUN
    • Transactions of the Korean hydrogen and new energy society
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    • v.32 no.6
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    • pp.618-635
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    • 2021
  • Environmental issues caused by our dependence on fossil fuels have caused our society to move toward new renewable sources of energy and chemicals. In this study, we develop an integrated process that co-produces butene oligomer (i.e., biofuels) and 1,3-butadiene (i.e., monomer for the production of synthetic rubber). To minimize utility consumption, we conduct heat integration. Then, we conduct a range of techno-economic analysis and life-cycle assessment to investigate economic and environmental feasibility of the proposed process.

RESEARCH ON THE DEVELOPMENT OF COLLEGE STUDENT EDUCATION BASED ON MACHINE LEARNING - TAKE THE PHYSICAL EDUCATION OF YANBIAN UNIVERSITY AS AN EXAMPLE

  • Quan, Yu;Guo, Wei-Jie;He, Lin;Jin, Zhe-Zhi
    • East Asian mathematical journal
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    • v.38 no.1
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    • pp.65-84
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    • 2022
  • This paper is based on Yanbian University's physical test data, and uses statistical analysis methods to study the relationship between college students' physical test scores to promote college physical education. Firstly, using gender as categorical variables, we conduct a general analysis of students in different majors and different grades, and obtain the advantages and disadvantages of male and female college students; then we use Decision Trees and Random Forest algorithms to conduct modeling analysis to provide valuable suggestions for relevant departments of the university. the aiming of this research analyzing about the undergraduates physical test is that giving universities the targeted suggestions to improve the college graduate rate and promote the overall development of higher education, lay the foundation for achieving universal health.

A Study on the Durability of Concrete for High-rise Concrete Mat Foundation (초고층 콘크리트 매트 기초용 콘크리트 내구성에 관한 연구)

  • Park, Dong-Choen;Kim, Young-Bong
    • Proceedings of the Korean Institute of Building Construction Conference
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    • 2022.11a
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    • pp.115-116
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    • 2022
  • Large concrete mass members are commonly used as matte bases for skyscrapers. In general, Integral casting is preferred to secure construction convenience and durability quality rather than separate casting. However, there is a possibility that cracks may occur in the early stages due to the generation of a lot of hydration heat, and thus durability will decrease, so it is necessary to determine an appropriate mixture and verify it through experiments. The purpose of the study was to conduct a review on the durability of the optimal high-performance low-heating concrete combination derived through the experiment and to conduct a review analysis on the performance satisfaction and performance expression mechanism.

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Properties and Trends in Conductive and Insulating Polymers - A Review (전도성 고분자와 절연성 고분자의 특성 및 동향)

  • Ayoung Jang;Jisu Lee;Sang Oh Lee;Jaewoong Lee
    • Textile Coloration and Finishing
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    • v.35 no.4
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    • pp.274-283
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    • 2023
  • Conductive polymers are polymers that conduct electricity like metal conductors. Unlike typical organic polymers, they are polymers that have the electrical, magnetic, and optical properties of metals or semiconductors. For Example, these conductive polymers include Polypyrrole (PPy), Polyaniline (PANI), and Polythiophene (PT). On the other hand, Insulating polymers do not conduct electricity well while providing insulation, which is the opposite of conductivity. With the exception of conductive polymers, most polymers are non-conductors. Insulating polymers include polyimide (PI), polystyrene (PS), and poly(vinyl alcohol) (PVOH, PVA, or PVAl). Although many different polymers exist, we have simply illustrated the properties and recent developments of conductive and insulating polymers, which have opposite properties.

Central Institutional Review Board: Past, Present, and Future (중앙 임상시험심사위원회 역할과 한계 그리고 극복 방안)

  • Dae Ho Lee
    • The Journal of KAIRB
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    • v.5 no.2
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    • pp.33-42
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    • 2023
  • In the conduct of multicenter clinical trials, multiple reviews by multiple Institutional Review Board (IRB) result in unnecessary duplication of efforts, delays and increased expenses of the trials, placing unavoidable burdens on not only investigators and sponsors but also IRBs. During the coronavirus disease 2019 pandemic periods, as the need of multicenter clinical trials for its therapeutics and vaccines increased, a centralized IRB became more important than before in order to efficiently conduct the multicenter trials without unnecessary multiple reviews. Accordingly, government-supported central IBR as a new centralized IRB has launched to foster multicenter clinical trials while to avoid unnecessary reviews and delays and to reduce burdens of all stakeholders. However, there are still barriers to be overcome and problems to be solved in the central IRB. In this review, we introduce background and history of the central IRB and try to propose some strategies or solutions against the barriers and problems.

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