• 한국과학교육학회지
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• 제13권3호
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• pp.341-358
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• 1993

In this study, the researcher analyzed relationship between stuents' science anxiety and achivement, and investigated the tendency of the science anxiety by students' variables. For the survey of this study. 5,304 stuents were sampled from the population of Korean secondary school. The researcher adopted R&D procedure for the development of SAMS(science anxiety measurement scale) and the SAT(science achivement test). The instrument SAMS consisted of 38-item scale. Cronbach a for SAMS was 0.92, concurrent validity was 0.66. SAT consist of 2O-item, the reliable coefficent of KR-20 was 0.70. The data were analyzed by using Pearson-Product coefficient and Regression analysis for the correlation between dependent and independent variable. The tendency of science anxiety were analyzed Multi-way analysis of variance, and all hypotheses were evaluated as the significant level of 0.001. Results of this study were summarized as follows : 1) The relationship between the science anxiety and the achivement showed negative correlation(r=-O.24) in all grades. 2) The relationship between the male and the female showed negative correlation (male;r=-Q.23. female=-O.22), but 11ths' humanities course and female of the science course didn't showed correlation. 3) The size of city where the school located showed negative correlation to the students anxiety(big city;-O27. medium;-O.24, small city;-O.22). 4) Tendency of students' science anxiety according to the variable of grades and sex variables was found to significant difference. The effects of interaction were found to significant difference between two variables of grade and sex. sex and local, local and grade. The effects among three variables were formed to significant difference grade, sex and local.

• 한국물환경학회지
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• 제36권6호
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• pp.636-650
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• 2020

A modeling system that can consider the overall water environment and be used to integrate hydrology, water quality, and aquatic ecosystem on a watershed scale is essential to support decision-making in integrated water resources management (IWRM). In adapting imported models for evaluating the unique water environment in Korea, a platform perspective is becoming increasingly important. In this study, a modeling platform is defined as an ecosystem that continuously grows and provides sustainable values through voluntary participation- and interaction-of all stakeholders- not only experts related to model development, but also model users and decision-makers. We assessed the conceptual values provided by the IWRM modeling platform in terms of openness, transparency, scalability, and sustainability. I We also reviewed the technical aspects of functional and spatial integrations in terms of socio-economic factors and user-centered multi-scale climate-forecast information. Based on those conceptual and technical aspects, we evaluated potential modeling platforms such as Source, FREEWAT, Object Modeling System (OMS), OpenMI, Community Surface-Dynamics Modeling System (CSDMS), and HydroShare. Among them, CSDMS most closely approached the values suggested in model development and offered a basic standard for easy integration of existing models using different program languages. HydroShare showed potential for sharing modeling results with the transparency expected by model user-s. Therefore, we believe that can be used as a reference in development of a modeling platform appropriate for managing the unique integrated water environment in Korea.

• 지역사회간호학회지
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• 제14권2호
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• pp.287-298
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• 2003

The purpose of the study was to develop an integrated prevention program to strengthen elders self-care capability and to examine its effectiveness on their psychological condition. This study used one group pre- and post-test design. Subjects were 85 elderly residents (over 65 years of age) who lived alone, and received free basic medical care and social welfare services in a rural community in Korea. Subject eligibility criteria for this study were to an elders who 1) is not currently taking any anti-depressant medication 2) is able to communicate, and 3) agrees to participate in this study. The integrated program was composed of horticulture, reminiscence, and friendship activities. Twelve sessions were provided for 12 weeks in community-based partnerships to achieve better outcomes. The intervention was case-managed by a public health nurse and aided by six volunteers. The main outcome variable was depression, which was assessed by using 15 items selected from the Geriatric Depression Scale-short form Korean version. Socio-demographic characteristics, functional status, and satisfaction with social support were used as covariates. Results showed that there was a significant intervention effect at post-intervention time point compared to pre-intervention time point(E.S. 0.94). Multiple linear regression analysis showed significant interaction effects between intervention and satisfaction with social support. These findings must be interpreted within the context that an effects of an integrated program could be more synergistically increased when social support factor is considered in the program. A community-based integrated prevention program of depression is effective for vulnerable rural elderly. It is suggested that randomized controlled trials within community setting for better methodological strength as well as multi-level outcomes on community need to be conducted in future.

• 한국콘텐츠학회논문지
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• 제7권4호
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• pp.213-223
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• 2007

본 연구에서는 화상 교육 시스템을 이용하여 사이버 집단 상담을 실시하고 그 효과를 검증하였다. 이를 위해 두 가지 가설을 설정하였다. 첫째, 실시간 화상 사이버 집단 상담은 자기 존중감을 증진 시킬 것이다. 둘째, 화상 교육 시스템을 활용한 사이버 집단상담은 학생들의 내적 행동 변화를 가져올 것이다. 이 두 가설을 검증하기 위해 대도시 D초등학교 학생 45명을 선발하고 이미 개발된 화상 교육 시스템을 이용하여 사이버 집단 상담을 실시하였다. 그 결과 실시간 화상사이버 집단 상담은 학생들의 자기 존중감을 증진시키고 내담자의 적극적인 참여를 유도하며 활발한 상호작용을 일으켜 상담자와 내담자 간에 정서적 안정감 및 친밀감을 형성시키는 것으로 나타났다. 따라서 본 연구의 결과는 집단 상담의 사이버 영역을 한 단계 넓히는 데 도움을 줄 것이며 본격적인 실시간 화상 교육 체제의 시행을 앞두고 다자간 화상시스템의 교육적 효과를 검증하는 연구에 기초 자료로 활용될 것으로 사료된다.

• Journal of Communications and Networks
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• 제9권4호
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• pp.511-523
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• 2007

In broadband convergence network(BcN), heterogeneous broadband wired & wireless subnetworks and various terminal equipments will be interconnected. In order to provide end-to-end realtime multimedia services on such heterogeneous networking environment, as a result, two major problems should be resolved: i) Multimedia session establishment & negotiation that adjusts the differences in the capability of multimedia data processing at the end terminal nodes, ii) quality of service(QoS)-guaranteed connection establishment or resource reservation with connection admission control(CAC) in each heterogeneous subnetworks along the path. The session layer signaling(e.g., SIP/SDP) should be extended for QoS negotiation, and must be tightly cooperating with network layer signaling or resource reservation with CAC function. In this paper we propose a session and connection management architecture for the QoS-guaranteed realtime multimedia service provisioning on BcN, with Q-SIP/SDP, resource reservation protocol with traffic engineering extension, and CAC functions. The detailed interaction scenario and related algorithms for QoS-guaranteed realtime multimedia session, resource reservation and connection establishment are explained and analyzed. From the experimental implementation of the proposed scheme on a small scale BcN testbed, we verified that the proposed architecture is applicable for the realtime multimedia service provisioning. We analyze the network performance and QoS parameters in detail.

• Advances in nano research
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• 제11권6호
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• pp.581-593
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• 2021

This model is proposed to describe the buckling behavior of Carbon Nanotubes (CNTs) embedded in an elastic medium taking into account the combined effects of the magnetic field, the temperature, the nonlocal parameter, the number of walls. Using Eringen's nonlocal elasticity theory, thin cylindrical shell theory and Van der Waal force (VdW) interactions, we develop a system of partial differential equations governing the buckling response of CNTs embedded on Winkler, Pasternak, and Kerr foundations in a thermal-magnetic environment. The pre-buckling stresses are obtained by applying airy's stress function and an adjacent equilibrium criterion. To estimate the nonlocal critical buckling load of CNTs under the simultaneous effects of the magnetic field, the temperature change, and the number of walls, an optimization technique is proposed. Furthermore, analytical formulas are developed to obtain the buckling behavior of SWCNTs embedded in an elastic medium without taking into account the effects of the nonlocal parameter. These formulas take into account VdW interactions between adjacent tubes and the effect of terms involving differences in tube radii generally neglected in the derived expressions of the critical buckling load published in the literature. Most scientific research on modeling the effects of magnetic fields is based on beam theories, this motivation pushes me to develop a cylindrical shell model for studying the effect of the magnetic field on the static behavior of CNTs. The results show that the magnetic field has significant effects on the static behavior of CNTs and can lead to slow buckling. On the other hand, thermal effects reduce the critical buckling load. The findings in this work can help us design of CNTs for various applications (e.g. structural, electrical, mechanical and biological applications) in a thermal and magnetic environment.

• 한국전자통신학회논문지
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• 제19권3호
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• pp.551-562
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• 2024

본 연구는 이동 객체 추출 및 추적 방법 및 장치에 관한 것으로, 특히 인접 영상 간의 차영상을 이용하여 객체를 추출하고, 추출된 객체의 위치정보를 지속적으로 전달함으로써 적어도 하나의 이동 객체의 정확한 위치정보를 토대로 이동 객체를 추적하는 이동 객체 추출 및 추적 방법 및 장치에 관한 것이다. 사람과 컴퓨터의 상호작용의 표현에서 시작된 사람추적은 로봇학습, 객체의 카운팅, 감시 시스템 등의 많은 응용분야에서 사용되고 있으며, 특히 보안 시스템분야에서 카메라를 이용하여 사람을 인식하고 추적하여 위법행위를 자동적으로 찾아낼 수 있는 감시 시스템 개발의 중요성이 나날이 커져 가고 있다.

• 지능정보연구
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• 제18권2호
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• pp.157-175
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• 2012

방대한 규모와 복잡한 프로세스로 구성된 공공조달의 혁신성과를 평가하기란 매우 어려운 문제이다. 기존의 프로세스 혁신 평가는 주로 설문 및 인터뷰, 그리고 운영데이터를 분석한 정성적, 또는 통계적인 정량적 방법들이었다. 이에 본 연구에서는 공공조달 프로세스를 복잡계로 보고 이에 대한 시뮬레이션 방법으로 멀티에이전트시스템(MAS)을 이용하여 공공조달 프로세스 혁신효과 평가모델을 개발하였다. 그리고, 개발된 MAS 기반의 공공조달 혁신평가 모델을 우리나라 조달청의 G2B(나라장터, KONEPS) 시스템에 적용하여 혁신효과를 평가하였다. MAS 시뮬레이션 도구는 Northwestern University에서 개발된 Netlogo Version 4.1.3을 사용하였고, 모델링에서는 에이전트 정의, 에이전트 행동특성 정의, 에이전트 관계 정의의 세단계로 진행하였다. 첫째, 에이전트 정의에서는 에이전트가 될 대상을 선정하고, 에이전트가 가진 속성과 변수들을 정의하였다. 둘째, 행동특성 정의에서는 각 에이전트의 행동계획 및 자원할당을 설정하였고, 셋째, 관계정의 단계에서는 상태변화에 따른 행동 규칙을 설정하였다. 또한 프로세스 혁신의 목적에 맞는 성과를 측정하기 위하여 혁신 효과평가항목을 선정하였고, 데이터는 조달청의 협조를 통해 DB 데이터와 설문데이터를 활용하였다. 이를 통해 프로세스 전체 및 프로세스별 절감시간과 업무량의 절감율을 측정하였다. 실험결과 전체 프로세스의 효율성이 증대되었으며 '평균 업무처리 건수'의 절감율이 92.7%, '평균 업무처리 시간'의 절감율이 95.4%로 나타났다. 즉 공공조달분야는 G2B 시스템 도입을 통해 프로세스 혁신을 추진한 결과 매우 높은 효율성이 제고된 것으로 분석되었다. 또한 본 연구를 통해 '계약'과 관련한 업무프로세스에서 추가적인 개선이 이루어질 경우 프로세스 혁신효과가 더욱 향상될 수 있는 것으로 분석되었다. 본 연구는 MAS를 이용하여 프로세스 개선효과에 대한 평가모델을 제시하고 분석했다는데 의의가 있다.

• 상하수도학회지
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• 제28권4호
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• pp.397-409
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• 2014

Algal problem in drinking water treatment is being gradually increased by causing deterioration of water supplies therefore, especially taste and odor compounds such as geosmin and 2-MIB occur mainly aesthetic problem by its unpleasant effects resulting in the subsequent onset of complaints from drinking water consumer. Recently, geosmin and 2-MIB are detected frequently at abnormally high concentration level. However, conventional water treatment without advanced water treatment processes such as adsorption and oxidation process, cannot remove these two compounds efficiently. Moreover, it is known that the advanced treatment processes i.e. adsorption and oxidation have also several limits to the removal of geosmin and 2-MIB. Therefore, the purpose of this study was not only to evaluate full scale nanofiltration membrane system with $300m^3/day$ of permeate capacity and 90% of recovery on the removal of geosmin and 2-MIB in spiked natural raw water sources at high feed concentration with a range of approximately 500 to 2,500 ng/L, but also to observe rejection property of the compounds within multi stage NF membrane system. Rejection rate of geosmin and 2-MIB by NF membrane process was 96% that is 4% of passage regardless of the feed water concentration which indicates NF membrane system with an operational values suggested in this research can be employed in drinking water treatment plant to control geosmin and 2-MIB of high concentration. But, according to results of regression analysis in this study it is recommended that feed water concentration of geosmin and 2-MIB would not exceed 220 and 300 ng/L respectively which is not to be perceived in drinking tap water. Also it suggests that the removal rate might be depended on an operating conditions such as feed water characteristics and membrane flux. When each stage of NF membrane system was evaluated relatively higher removal rate was observed at the conditions that is lower flux, higher DOC and TDS, i.e., $2^{nd}$ stage NF membrane systems, possibly due to an interaction mechanisms between compounds and cake layer on the membrane surfaces.

• 한국산학기술학회논문지
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• 제18권4호
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• pp.275-284
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• 2017

입체녹화가 도시환경을 향상시키는 효과가 있는 것으로 알려지면서 친환경 건축물의 새로운 대안으로 부각되고 국내적용에 대한 다양한 연구가 필요해지고 있다. 본 연구의 목적은 국내외 건축물 준공사례를 대상으로 건축물 내 외부에 반영되고 있는 입체녹화의 공간특성을 조사하고 구성체계 및 디자인요소를 분석하여 친환경구성을 위한 부문별 디자인 적용요소의 발전방향을 제시하는 데 있다. 분석결과, 입체녹화는 건축물 내 다양한 외부공간을 증가시키기 위하여 대형화하는 고밀도 개발형태를 보이며 초기에는 전시, 교육 등 공공시설이 많았으나 최근에는 공동주택 사례가 증가하고 있다. 공동주거 Unit에 다양한 근접공간을 도입하고 사적 공간에서 독립적인 녹화공간을 제시하는 등 거주자의 선호조건에 따라 선택적으로 근접공간을 이용하도록 계획하는 방법은 일률적인 국내 공동주거의 디자인을 지양하고 거주자의 다양한 행위를 유도할 수 있다. 새로운 공간분위기와 다양한 옥외공간으로 인한 커뮤니티 장소들은 사회적 상호 작용을 통해 공동주거의 생활패턴을 변화시키고 새로운 마을공동체를 조성하는 방법이 될 것으로 판단된다. 또한 대지의 환경특성을 적극적으로 반영하고 건축물 형태에 자연지형과 경사로를 이용하는 경향을 뚜렷이 보이고 있어 외부공간 환경조성 디자인요소에 대한 후속 연구도 필요하다.