• 한국초등과학교육학회지:초등과학교육
• /
• 제20권1호
• /
• pp.107-122
• /
• 2001

The Purpose of this study is to find the effects of the portfolio assessment on elementary students' scientific knowledge, inquiry process skill, scientific attitudes in the teaching of science. And finally the parents' response to the portfolio assessment is also investigated. In order to reach the goal of this study, the investigator developed the evaluation instrument such as an experimental report and a cumulative observation sheet for the 4th-grade Unit-1 'Light Propagation' and Unit-3 'Separating Mixtures', and then these were administered to 42 4th-grade elementary students in Inchon. Based upon the findings and within the limitations of this study, several conclusions can be drawn regarding the problems investigated. First, as the portfolio assessment offers enough information about individual student's performance, it has a highly positive effect on evaluating the students' scientific knowledges. It can also make possible to grasp the several aspects of the student's progress. Second, the portfolio assessment can be implemented without giving students any psychological pressure from testing itself. Therefore, the portfolio assessment is an effective means of appraising inquiry process skills. Third, the portfolio assessment is effective to evaluate the students' attitude toward science by means of individual records which include such aspects that is hardly found by the teacher who teaches science in the class. Fourth, as most parents showed a positive response to this portfolio assessment, it is considered to be effective method of appraising the result of teaching science at elementary school. Accordingly, this study demonstrated that the portfolio assessment is an effective method that can assess students' scientific knowledges, inquiry process skills, and scientific attitudes gained from science teaching-learning. Therefore, it is necessary to implement the portfolio assessment to other grade students as well in the following study where teacher may give more encouragements and suggestions to sti dents for the better learning motives. Also teachers should suggest more definite evaluation criteria to students so that they may improve the students' self and peer evaluation skills.

• 정보과학회 컴퓨팅의 실제 논문지
• /
• 제22권10호
• /
• pp.504-512
• /
• 2016

본 논문에서는 협업 필터링을 통한 개인 맞춤형 이벤트 추천 기법을 제안한다. 제안하는 기법은 사용자의 행위 및 관계성 분석, 협업 필터링을 통해 사용자의 평가되지 못한 속성 값을 예측한다. 또한, 사용자의 성향을 보다 정확하게 파악하기 위해 사용자의 최근 방문 기록이나 상황 정보를 고려하여 사용자의 최신 성향을 관리한다. 이를 통해 새로운 이벤트가 발생하였을 때 참여할 확률이 높을 것으로 예상되는 사용자에게만 이벤트를 추천하여 무분별한 추천을 방지한다. 제안하는 이벤트 추천 기법의 우수성을 보이기 위해 다양한 성능 평가를 수행한다.

• Tribology and Lubricants
• /
• 제39권6호
• /
• pp.244-249
• /
• 2023

This paper presents a comprehensive analysis of the impact of surface roughness on the friction and wear properties of SUS 321, an austenitic stainless steel variant produced using the laser powder bed fusion (LPBF) technique, which is a prevalent additive manufacturing method. After the LPBF fabrication, the specimens go a heat treatment process aimed at alleviating residual stress. Subsequently, they are polished extensively to achieve a refined and smooth surface. To deliberately introduce controlled variations in surface roughness, an etching process is employed. This multi-step method encompassed primary etching in a 3M hydrochloric acid solution, followed by secondary etching in a 35 wt% ferric chloride solution, with varying durations applied to different specimens. A comprehensive evaluation of the surface characteristics ensued, employing precise techniques such as surface roughness measurements and meticulous assessments of water droplet contact angles. Following the surface treatment procedures, a series of friction tests are performed to explore the tribological behavior of the etched specimens. This in-depth investigation reached its peak by revealing valuable insights. It clarified a strong correlation between intentionally altered surface roughness, achieved through etching processes, and the resulting tribological performance of LPBF-fabricated SUS 321 stainless steel. This significantly advances our grasp of material behavior in tribological applications.

• 한국응급구조학회지
• /
• 제12권1호
• /
• pp.17-26
• /
• 2008

Purpose : With a view to providing basic data to develop basic cardiopulmonary resuscitation education suitable for female college students, the basic cardiopulmonary resuscitation education was conducted to grasp students' knowledge, skill accuracy and the attitude change before and after the education. Methods : Convenience sampling was made on first graders(total-38 students) of K college located in K city, Chungcheongnam-do, and this was a preliminary research designed before and after choosing a single group. In terms of methods, the researchers as specified ; 1) Handed out questionnaires to students directly to make them fill in firsthand and collected the questionnaires. 2) Utilized Power Point materials based on 2005 AHA guideline and used Anne/Skill Reporter$^{(R)}$ torso produced by Leardal Inc, and Little Anne$^{(R)}$ to conduct practical education individually. 3) Asked students to give Anne/Skill Reporter$^{(R)}$ torso basic cardiopulmonary resuscitation five times with the ratio of 30:2, and then one of researchers filled in the evaluation sheet individually. 4) Evaluated the accuracy of students' ability to perform the resuscitation based on the record of Anne/Skill Reporter$^{(R)}$ integrated printer(which was the objective tool to grasp students' skills accuracy). 5) Gave out questionnaires to make students fill them in and then collected them, after completing the practical evaluation. Results : 1) In case of the attitude(confidence) about basic cardiopulmonary resuscitation, students' confidency rose from 14%(before the education) to 55.5%(after the education)- which was a positive change. 2) In case of the attitude(educational necessity) about basic cardiopulmonary resuscitation, students' confidency rose from 94.7%(before the education) to 100%(after the education)- which was a positive change. 3) As a result of the education, some female college students' scored knowledge about basic cardiopulmonary resuscitation. The average point also reached 88.95%(after the education), jump from 63.51%(before the education), which was the rise of 25.44%. 4) Regarding skill accuracy, pressure accuracy(%)($M{\pm}SD=91.37{\pm}14.16$) was higher than respiration accuracy(%)($M{\pm}SD=61.55{\pm}26.13$). Conclusion : The result showed that students' attitude(confidence, on basic cardiopulmonary resuscitation changed positively, and meaningful difference(p= .000) existed in the change of students' knowledge. Anne/Skill Reporter$^{(R)}$ performance showed that the accuracy of mouth-to-mouth resuscitation was lower than that of chest compression.

• 벤처창업연구
• /
• 제13권3호
• /
• pp.47-57
• /
• 2018

본 연구의 목적은 창업생태계를 네트워크적 측면에서 접근하여 창업자와 투자자의 네트워크에 대한 인식, 특성 등을 분석함으로서 네트워크와 기업간 성과창출과의 상관관계를 파악하는데 있다. 실증분석을 위한 연구 대상으로 정책적인 모범사례로 평가 받고 있는 TIPS사업을 선정하였고 조사 수집된 자료에 대해 소셜 네트워크 분석과 통계분석을 하였다. TIPS사업에 참여하는 창업기업과 투자자의 네트워크의 연결성이 기업의 성과에 영향을 미칠 것이라는 전제 하에 실시한 분석 결과, 다른 투자자와의 관계가 많을수록, 매개적 위치를 차지하고 있을수록, 다른 투자자들과의 직간접적 연결거리가 짧을수록, 영향력 있는 투자자와 연결되어 있을수록, 연결성이 큰 그룹에 소속되어 있을수록 해당 운영사가 투자한 창업팀의 후속투자 유치 가능성도 커지는 것으로 나타났다. 즉 투자자의 네트워크 연결성이 강할수록 투자자가 투자한 스타트업이 후속투자 유치에 성공하면서 생존, 발전할 가능성이 높은 것으로 확인되었다. 그리고 창업팀과 운영사 모두 투자 유치 또는 기업 발굴 시에 기업과 투자자 간의 내부 인적 네트워크가 중요한 역할을 한다고 생각하고 있었으며, 인적 네트워크 가치가 기업가치 평가나 투자 결정에서 중요한 영향을 미칠 것이라고 인식하고 있는 것으로 나타났다. 이러한 생태계 내의 네트워크가 창업기업의 성장에 긍정적인 인식을 통해 네트워크 중심의 생태계 발전방안에 대한 많은 연구가 있기를 기대한다.

• 한국문헌정보학회지
• /
• 제51권4호
• /
• pp.77-97
• /
• 2017

최근 생의학 분야의 학술 문헌이 기하급수적으로 급증함에 따라 관련 분야 연구자들은 선행 연구 및 연구 동향 파악에 어려움을 겪고 있다. 이에 효율적인 선행 연구 및 연구 동향 파악을 위한 정보 추출 기술이 요구되며, 학술 문헌의 정보 추출을 위한 개체인식 및 개체 간의 생의학 이벤트 추출 연구가 활발히 진행되고 있다. 본 연구는 이에 심층 학습(Deep Learning)의 기법 중 하나인 컨볼루션 네트워크(Convolutional Neural Networks, CNN) 모델을 기반으로 이벤트 내의 개체 유형 정보의 적용 위치와 함께, 이벤트 식별 및 분류를 고려하여 총 8가지의 모델을 구성하여 실험하였다. 실험 결과, 본 연구에서 제안하는 모델 중 최고성능을 보인 개체 유형 완전연결 모델이 이벤트 분류 실험에서 F-점수 72.09%의 높은 성능을 보였으나, 이벤트 추출 실험에서는 학습 컬렉션의 불균형 문제 및 이벤트 식별 모델의 성능 저조 등으로 인하여 F-점수 21.81%의 비교적 저조한 성능을 보였다.

• 대한인간공학회지
• /
• 제28권4호
• /
• pp.147-154
• /
• 2009

The tactical computer is currently being developed and installed in armored vehicles and tanks for reinforcement. With the tactical computer, Korea Army will be able to grasp the deployment status of our forces, enemy, and obstacles under varying situations. Furthermore, it makes the exchange of command and tactical intelligence possible. Recent studies showed that the task performance is greatly affected by the user interface. The U.S. Army is now conducting user-centered evaluation tests based on C2 (Command & Control) to develop tactical intelligence machinery and tools. This study aims to classify and regroup subordinate menu functions according to the user-centered task performance for the Korea Army's tactical computer. Also, the research suggests an ergonomically sound layout and size of main touch buttons by considering human factors guidelines for button design. To achieve this goal, eight hierarchical subordinate menu functions are initially drawn through clustering analysis and then each group of menu functions was renamed. Based on the suggested menu structure, new location and size of the buttons were tested in terms of response time, number of error, and subjective preference by comparing them to existing ones. The result showed that the best performance was obtained when the number of buttons or functions was eight to conduct tactical missions. Also, the improved button size and location were suggested through the experiment. It was found in addition that the location and size of the buttons had interactions regarding the user's preference.

• 한국컴퓨터정보학회논문지
• /
• 제17권10호
• /
• pp.185-192
• /
• 2012

콜센터는 고객과의 접촉에 있어 비대면 채널에 의해 커뮤니케이션이 이루어지기 때문에 대면 접촉에 의한 것보다 더 많은 상담사의 능력을 요구한다. 이러한 상담사의 능력개발을 위해 콜센터들은 경력과 직무에 따라 다양한 교육훈련을 실시하고 있으며, 교육훈련의 성과로 상담품질이나 생산성 향상을 실현하고자 한다. 한편, 교육훈련에는 많은 시간과 예산이 투입되기 때문에 교육훈련의 평가를 통해 현업수행에 도움이 얼마나 되고 있는지 그 효과성이 파악되고 관리되어야 할 것이다. 지금까지의 교육훈련의 평가에 대한 연구들을 보면 만족도와 학습정도를 측정하거나 학습이 행동에 전이되는 정도를 측정하는 연구가 주류를 이루어 전체적인 평가모형에 관한 연구가 필요하다. 본 연구에서는 콜센터교육훈련의 효과성을 상담사들의 인식수준에서 Kirkpatrick의 4단계 평가모형을 반영하여 반응, 학습, 행위, 결과에 대한 각 단계별 평가기준 간에 어떠한 영향관계가 있는지 알아보고, 구조방정식 모델을 사용하여 전체적인 모형의 적합도를 살펴보았다, 또한 대안모형으로 반응요인과 행위요인의 직접적인 관계를 고려하여 연구모형과 대안모형의 구조모델 적합도를 비교 분석하였다.

• 한국문헌정보학회지
• /
• 제23권
• /
• pp.127-163
• /
• 1992

The proper evaluation of reference services requires qualitative approach as well as quantitative one. The quality of a reference service can be evaluated by how promptly and accurately a librarian responds to the user's questions and also by how much the user is satisfied with the librarian's overall performance in providing the answer. In this study, the reference service of an university library was evaluated by the following procedure : 1. Identification of a group of the most frequently referred Korean government publications through two pre-tests of user surveys. 2. Preparation of 130 questions of bibliographic and factual type from the above publications. 3. Selection of 30 questions which can be answered from the collection of the evaluated library. 4. Mimic requests of reference service by 5 proxies trained on the unobtrusive test method with 30 questions asked at various times of the day and on various days of the week during a period of 5 months. 5. Drawing up of response sheets (by proxies) with descriptive comments on library staffs' question administration, response, attitude, etc. 6. Preparation and coding of data tabulation sheets and final analysis. The conclusions of this study are as follows : 1. The user serveys showed that needs for the library service for government publications were great. The $80\%$ of the government publications users were visiting more than two organizations for access to information and the $37\%$ were getting information directly from the publishers. 2. The librarians of the evaluated library could give correct answers to $53\%$ of 30 (bibliographic and factual) guestions. 3. The correctness of answer was independent of the length of the time spent the librarians. The librarians' grasp of the questions and direction of approach determined the success or failure of the service. 4. The librarians relied too much on the reference library catalog which doesn't include many of the government publications of their own collection. 5. The $79\%$ of the failure of the service were due to the librarians' lack of knowledge as to the information source for government publications and the unsystematic method of approach to it.

• 한국안전학회지
• /
• 제35권3호
• /
• pp.32-42
• /
• 2020

In this study, in order to secure the necessity of introducing the safety certification system for the assembled temporary equipment and materials, the feasibility of the introduction was analyzed through literature review, structural analysis, and actual experiments and surveys related to the assembled temporary equipment and materials. In the previous studies, it was found that the research on the assembled temporary equipment and materials was insufficient, and it was possible to grasp the necessity of introducing the safety certification system for the assembled temporary equipment and materials. In addition, in the results of the serious accident analysis, it was found that the soundness of the temporary equipment and materials is determined by the structural characteristics after it was assembled. As a result of the feasibility analysis of the introduction of the safety certification of the assembled temporary equipment and materials through structural analysis, it is possible to effectively and rationally reflect the main geometrical influence factors, and to introduce the safety certification system that can test the procedures and procedures of the assembled temporary equipment and materials and based on it. It was found that there is a need. As a result of feasibility analysis on the necessity of introducing the safety certification system for assembled temporary equipment and materials through actual experiments, the existing single member performance evaluation has limitations in evaluating the structural performance of the assembled temporary equipment and materials. It was found that there is a need to introduce a safety certification system. As a result of gathering opinions on the feasibility of introducing the safety certification system for assembled temporary equipment and materials of manufacturers and users through the survey, it was found that the overall positive response result was high and the effectiveness was high.