Anode-Cathode 반응형 유기계 방청제의 전기화학적 방식성능 평가

권대훈 ( Kwon Dae-hun ),최상섭 ( Choi Sang-seop ),이한승 ( Lee Han-seung ) 한국구조물진단유지관리공학회 2010 한국구조물진단유지관리공학회 학술발표대회 논문집 Vol.14 No.1

Corrosion inhibitor admixtures have been in use for some time to extend the life of concrete infrastructures. The most common amongst these are the inhibitor based on inorganic nitrite. In recent years inhibitors based on organic amins have become available with the claimed advantage that, as well as being capable of application as admixtures, they may be applied to the surface of the concrete. In this study, we estimate the corrossion rate of bar by Tafel extrapolation method, one of electrochemical technoque, and the reasonable dosage of inhibitor, and we evaluate the corrosion protection effect between adsorption inhibitor and passive film forming inhibitor.

관내마찰저항 시험장치를 활용한 콘크리트의 관내 유동 및 마찰저항 특성의 평가에 관한 연구

김형래,조호규,권대훈,Kim, Hyung-Rae,Jo, Ho-Kyoo,Kwon, Dae-Hun 대한건축학회 2011 대한건축학회논문집 Vol.27 No.11

The establishment of the technology for evaluating friction resistance and pipe pressure and the relation of the fluid characteristics and pumpability of concrete is essential for the evaluation of concrete pumping performance for high speed construction of super-tall building. So, this study focuses on quantitative evaluation of concrete fluid characteristics and surface friction resistance under the change of concrete mix proportion and pumping condition. For this, we developed temporary horizontal pumping evaluation system to measure pipe pressure and surface friction characteristics. And, relations between concrete mix proportion and pressure characteristics was investigated by experiment. As the result of the experiment, high regression between the surface friction and pressure gradient was confirmed. And, It means that it is able to evaluate the friction resistance between concrete and pipe by means of the pumping system that includes frictional resistance testing pipe.

전술 에드혹 환경에서 이종망 게이트웨이 구조 및 시뮬레이션 연구

노봉수,한명훈,권대훈,함재현,윤선희,하재경,김기일,Roh, Bong Soo,Han, Myoung Hun,Kwon, Dae Hoon,Ham, Jae Hyun,Yun, Seon Hui,Ha, Jae Kyoung,Kim, Ki Il 한국시뮬레이션학회 2019 한국시뮬레이션학회 논문지 Vol.28 No.2

전술 에드혹 환경은 개별 지상 노드 간 분산적인 형태의 자율망으로 구성되므로 네트워크의 생존 가능성 및 유연성 측면에서 효과적이나 기동 간 통신 시 제한된 출력, 지형특성, 이동성 등의 제약으로 인하여 잦은 링크 단절 및 음영지역이 발생할 수 있다. 반면 위성 통신망은 지상 기동 망에 비해 지형특성과 이동성을 극복한 광역 무선 링크를 제공할 수 있는 장점이 있으나 상대적으로 한정된 대역폭 및 고지연 특성의 망이다. 미래 전장 환경에서 기존의 단독망 형태의 제약사항을 극복하고 지휘 통제 통신의 신뢰성 및 효율성을 높이기 위해서는 이종망 게이트웨이(Heterogeneous network gateway, HNG)를 중심으로 위성 통신망을 포함한 다계층 통합 네트워크 구조가 요구된다. 본 논문에서는 전술 에드혹 환경에서 위성-전술 에드혹 망을 통합적으로 고려하고 유통되는 임무 트래픽의 플로우 특성에 기반하여 신뢰성 있는 데이터 전달이 가능한 이종망 게이트웨이 구조 및 세부 알고리즘을 제시한다. 시뮬레이션은 네트워크 수준의 시뮬레이터인 Riverbed Modeler를 활용하여 제시하는 구조의 유효성을 확인하였다. The tactical mobile ad-hoc network(MANET) consists of distributed autonomous networks between individual ground nodes, which is effective in terms of network survivability and flexibility. However, due to constraints such as limited power, terrain, and mobility, frequent link disconnection and shadow area may occur in communication. On the other hand, the satellite network has the advantage of providing a wide-area wireless link overcoming terrain and mobility, but has limited bandwidth and high-latency characteristic. In the future battlefield, an integrated network architecture for interworking multi-layer networks through a heterogeneous network gateway (HNG) is required to overcome the limitations of the existing individual networks and increase reliability and efficiency of communication. In this paper, we propose a new HNG architecture and detailed algorithm that integrates satellite network and the tactical MANET and enables reliable data transfer based on flow characteristics of traffic. The simulations validated the proposed architecture using Riverbed Modeler, a network-level simulator.

관내마찰저항 시험장치를 활용한 콘크리트의 관내 유동 및 마찰저항 특성의 평가에 관한 연구

김형래(Kim, Hyung-Rae),조호규(Jo, Ho-Kyoo),권대훈(Kwon, Dae-Hun) 대한건축학회 2011 大韓建築學會論文集 : 構造系 Vol.27 No.11

The establishment of the technology for evaluating friction resistance and pipe pressure and the relation of the fluid characteristics and pumpability of concrete is essential for the evaluation of concrete pumping performance for high speed construction of super-tall building. So, this study focuses on quantitative evaluation of concrete fluid characteristics and surface friction resistance under the change of concrete mix proportion and pumping condition. For this, we developed temporary horizontal pumping evaluation system to measure pipe pressure and surface friction characteristics. And, relations between concrete mix proportion and pressure characteristics was investigated by experiment. As the result of the experiment, high regression between the surface friction and pressure gradient was confirmed. And, It means that it is able to evaluate the friction resistance between concrete and pipe by means of the pumping system that includes frictional resistance testing pipe.

반독립형 연속 가변 댐퍼를 이용한 지능형 현가시스템의 개발

심재진(Jae Jin Shim),김진한(Jin Han Kim),김대원(Dae Won Kim),권대훈(Dae Hun Kwon),배준영(Joon Young Bae),이두형(Doo Hyung Lee) 한국자동차공학회 1999 한국 자동차공학회논문집 Vol.7 No.4

受檢能力의 認知的 및 情意的 關聯變因 分析

권대훈 안동대학 학생지도연구소 1992 學生指導硏究 Vol.12 No.1

Test-wiseness was defined as an examinees cognitive capacity to utilize the characteristics and formats of the test and/or test situation to receive high score, and is logically independent of the examinees knowledge of the subject-matter for which the tests are supposedly to measure. Despite of its long history in the measurement fields, no studies which have investigated the correlates of test- wiseness comprehensively were found by now. The purpose of this article is to examine the extent to which IQ, cognitive style (field independences field dependence), attitude for testing, self-efficacy for testing are related to test-wiseness. Three hundred and sixty high school students took five tests in a random order; three tests developed by the author (Test-Wiseness Scale (TWT), Attitude Scale for Testing, Self-Efficacy Scale for Testing); a Korean version of Test Anxiety Inventory (Spielberger, Gonzalez, Taylor, Anton, Algaze, Ross, and Westberry, 1980 translated by Choi (1988), and Group Embedded Figures Test (Oltman, Raskin, and Witkin, 1971). The results show that test-wiseness were significantly correlated with IQ, cognitive style, attitude for testing, and self-efficacy for testing. But test-anxiety was not correlated with test-wiseness.

시험에 대한 자기효능이 학업성적과 시험불안에 미치는 영향

권대훈 안동대학 학생지도연구소 1991 學生指導硏究 Vol.11 No.1

A 21-item Self-Efficacy Scale for Testing was developed to measure high school students' self-efficacy judgments regarding specific testing-related tasks and skills. The relations of self-efficacy for testing on the academic achivement and test anxiety was examined. Three hundred and sixty high school students took Self-Efficacy Scale for Testing and Test Anxiety Inventory in a random order. Students achievement information was also recorded. Results showed that high internal consistency reliability for the Self-Efficacy Scale for Testing. Results also indicated significant correlations between self-efficacy for testing and academic achievement and test anxiety. This study confirms some limited aspects of reliability of self-efficacy measure for testing, and helps to clarify the role of self-efficacy for testing in academic contexts.

受檢能力의 構成要素分析

권대훈 안동대학 학생지도연구소 1989 學生指導硏究 Vol.10 No.1

Despite of its long history in the measurement fields, there is no consensus among measurement specialists on the components which comprise the construct of test-wiseness. Although Millman, Bishop and Ebel (1965) have proposed theoretical framework of test-wiseness which were comprised of six components-namely, time-using strategies, error-avoidance strategies, guessing strategies, deductive reasoning strategies, intent consideration strategies, and cue-using strategies-of test wiseness, none of the research have been performed to test the adequacy of their framework, either logically or empirically. This state of affairs is partially explained by research orientations itself in this area. Most researchers have been attempted to test the effects of experimental manipulation of test-wiseness on the test scores. As a result instruments that could be used to measure six component of test-wiseness were not developed until now. On the premise that test-wiseness is a factorially complex construct, six dimensions-test taking processes, generality, itme type, subject matter domain of the test, behavioral nature, time-are identified through literature review and discussed with respect to its relevancy as dimension of test-wiseness components. Of these six dimemsions, taxonomy of test-wiseness to be determined on the basis on test taking processes, generality, item type, subject-matter domain of the test, And then techniques that measure components of the taxonomy is developed and validated.

수행평가의 문제점

권대훈 한국교육학회 대구·경북지회 2000 교육학논총 Vol.21 No.2

Put simply, performance assessment is assessment based on observation and judgment(Stiggins, 1994). Performance assessment is becoming increasingly popular because it promises authentic and direct evaluation of educational achievement leading to positive consequences for learning and teaching. However, along with the positive benefits come with problems of psychometric characteristics and implementation. This article begin with an overview of the backgrounds and forces that gave rise to the revival of performance assessment. And main features of performance-based assessments are described. Finally, four main issues facing performance assessment-i. e., conceptual issues, validity-related issues, reliability-related issues, practicality-related issues-are discussed. Performance assessment is one of the current educational reform movements have caught the attention of diverse educational stakeholders-i. e., teacher, students, parents-in Korea. Performance assessment holds a lot of promise. The promise is alluring, yet what we know about performance-based assessment is small when compared with what we have yet to discover(Herman, 1996). Performance assessment is not panacea for all of educational ills. Performance assessment faces many problems must resolve as it progresses. If performance assessment is to survive and to develop into a potent force for educational improvement, then educators must resolve problems confronting it.

自己?能理論의 動機觀과 硏究動向

권대훈 안동대학 학생지도연구소 1988 學生指導硏究 Vol.8 No.1

This article examines motivational perspective of Bandura's self-efficacy theory and reviews recent research articles which was performed to test its predictions in academic achievement situations. First, motivational perspective of self-efficacy framework is discussed Self-efficacy refers to personal judgment about one's capability to organize and implement behavior in specific situations. As a proximal mediating mechanism, self-efficacy is hypothesized to influence task motivation (effort expenditure and persistence), choice of activities, and thought patterns people acquire their efficacy information from their performance accomplishments, vicarious experiences, verbal persuasion, and their physiological states. People judge (percept) their efficacy in specific situations through inferential process in which these information are weighted and integrated with respect to various efficacy cues such as perceived ability, effort expenditure, external aids, outcome patterns. Second, self-efficacy perspective is compared with locus of control, attribution theory, self-worth theory, and learned helplessness. Third, recent studies performed under the rubric of self-efficacy are divided into those upon student efficacy and those upon teacher efficacy, and reviewed separately. Studies which successfully enhanced student self-efficacy are reviewed under the headings of reward, attributional feedback, goal-setting, social comparision, and strategy training with their educational implications. And the nature, antecedents, and consequences of teacher efficacy are discussed according to the self-efficacy framework. Also the relations of student efficacy, teacher efficacy, achievement, and other related variables are explored. Finally, some directions for future research are suggested.