• 대한간호학회지
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• 제46권1호
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• pp.90-99
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• 2016

Purpose: This study was conducted to examine effects of a learning portfolio by identifying the learning of nursing students taking a learning portfolio-utilized nursing management class. Methods: A non-equivalent control group pretest-posttest design was used. Participants were 83 senior students taking the nursing management course in one of the Departments of Nursing at 2 Universities. Experimental group (n=42) received a learning portfolio-utilized nursing management class 15 times over 15 weeks (3 hours weekly). Self-directed learning abilities, approaches to learning and learning flow of the participants were examined with self-report structured questionnaires. Data were collected between September 2 and December 16, 2014, and were analyzed using chi-square test, Fisher's exact test, independent t-test and ANCOVA with SPSS/PC version 21.0. Results: After the intervention the experimental group showed significant increases in self-directed learning abilities, deep approaches to learning and learning flow compared to the control group. However, no significant difference was found between groups for surface approaches to learning. Conclusion: Learning activities using the learning portfolios could be effective in cultivating the learning competency for growth of knowledge, technology and professionalism by increasing personal concentration and organization ability of the nursing students so that they can react to the rapidly changing environment.

• Asia pacific journal of information systems
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• 제30권1호
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• pp.31-52
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• 2020

Stock markets are popular investment avenues to people who plan to receive premium returns compared to other financial instruments, but they are highly volatile and risky due to the complex financial dynamics and poor understanding of the market forces involved in the price determination. A system that can forecast, predict the stock prices and automatically create a portfolio of top performing stocks is of great value to individual investors who do not have sufficient knowledge to understand the complex dynamics involved in evaluating and predicting stock prices. In this paper the authors propose a Stock prediction, Portfolio Generation and Selection model based on Machine learning algorithms, Artificial neural networks (ANNs) are used for stock price prediction, Mathematical and Statistical techniques are used for Portfolio generation and Un-Supervised Machine learning based on K-Means Clustering algorithms are used for Portfolio Evaluation and Selection which take in to account the Portfolio Return and Risk in to consideration. The model presented here is limited to predicting stock prices on a long term basis as the inputs to the model are based on fundamental attributes and intrinsic value of the stock. The results of this study are quite encouraging as the stock prediction models are able predict stock prices at least a financial quarter in advance with an accuracy of around 90 percent and the portfolio selection classifiers are giving returns in excess of average market returns.

• 한국초등과학교육학회지:초등과학교육
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• 제19권2호
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• pp.29-41
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• 2000

The purpose of this study is to examine the effects of the Portfolio applied science instruction on the students' scientific affective domain and perceptions of portfolio in elementary schools. Portfolio applied science instruction of the 6th grade science unit 'Environment pollution and Nature protection' was developed for this study. Traditional instruction was implemented to the control group and portfolio applied science instruction was implemented to the experimental group. Pretests of the scientific affective domain were administered to both groups. The treatment was given for about seven weeks for both groups. Instruments about scientific affective domain were administered to both groups. A questionnaire on perception of portfolio applied science instruction was given to the experimental group after the treatment. The results were analyzed using t-test on the students' scientific affective domain. The results of this study are as follows: 1. Portfolio applied science instruction program for elementary schools was developed. Students themselves determine the portfolio learning goal in a portfolio applied science instruction. Students construct the portfolio and they evaluate themselves and other colleagues. Also teachers go on portfolio applied science instruction considering portfolio purpose, concepts, evaluation. 2. There was not a statistically meaningful difference between an experimental group and a control group o]1 the students' scientific affective domain. In three sub categories of a scientific affective domain, the science perception, the interest on science and scientific attitude, there were not statistically meaningful difference among them. 3. As the results of the questionnaire on perceptions of portfolio, they didn't understand it very well but after learning portfolio, they showed positive attitude to perceptions of portfolio. Students in portfolio applied science instruction like more the portfolio applied science instruction than general instruction. 4. Portfolio applied science instruction has an useful value as a method of teaching and evaluation. Students and teachers can produce various portfolios products in portfolio applied science instruction. As a conclusion, portfolio applied science instruction was not statistically meaningful on the students' scientific affective domain, but it gives positive effects on perceptions of portfolio in elementary schools. Therefore, portfolio has an educational value as a method of teaching and evaluation for students' growth. In the future, teachers and students must have interaction and feedback in portfolio applied science instruction.

• 대한수학교육학회지:학교수학
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• 제4권3호
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• pp.331-346
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• 2002

This study has two purposes. One is to know that it is Possible to use portfolio in the elementary math class. The other is to make a useful method for using portfolio. We got the following conclusion through the study. Portfolio gave students an opportunity that they could review their mathematical thinking. But it couldn't work very well for the low-level students. They didn't pay attention to the class. So, careful prepa-ration and training were necessary for the portfolio material. And the portfolio material must be prepared by appropriate contents. Teacher had to do math class by considering students ability. The math class could be much better for motivation, teaching-learning activity impro-vement and communication tool by using portfolio material. There are several imple-mentation processes in preparation, execution and utilization of the class. 1) Preparation: Teacher must decide if it is appropriate for portfolio by analyzing the course and textbook and set a final goal. And then teacher has to select an appropriate item and make a schedule for the class. The portfolio material must contain valuable things from which students learn mathematics and use in their life. The student level, utilization purpose and contents are considered when one prepares portfolio material. 2) Execution: Students are supposed to understand about the portfolio very well. It is important for them to get the opportunity for reviewing through math class diary, their opinion, friends opinion and teachers opinion. 3) Utilization: Parents review ameliorates the communication among teacher, student and parents about learning activity.

• 대한산업공학회지
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• 제39권6호
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• pp.535-545
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• 2013

The goal of stock investment is earning high rate or return with stability. To accomplish this goal, using a portfolio that distributes stocks with high rate of return with less variability and a stock price prediction model with high accuracy is required. In this paper, three methods are suggested to require these conditions. First of all, in portfolio re-balance part, Max-Return and Min-Risk (MRMR) model is suggested to earn the largest rate of return with stability. Secondly, Entering/Leaving Rule (E/L) is suggested to upgrade portfolio when particular stock's rate of return is low. Finally, to use outstanding stock price prediction model, a model based on Semi-Supervised Learning (SSL) which was suggested in last research was applied. The suggested methods were validated and applied on stocks which are listed in KOSPI200 from January 2007 to August 2008.

• 한국간호교육학회지
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• 제20권4호
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• pp.534-547
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• 2014

Purpose: This study verifies the meaning on application experiences of learning portfolio in nursing students. Method: Participants of this study included 22 nursing students divided into 3 focus groups who had experienced on application of Learning Portfolio in university Y and university S in Kyungpook and Daegu, respectively. Data were collected from December 2013 to January 2014 through in-depth, recorded focus group interviews and subsequently analyzed via Colaizzi's (1978) phenomenological methodology. Results: The essential theme of this study is 'Finding a vision from confusion and suffering.' From 35 significant statements, 5 theme clusters, 16 themes and 32 sub themes were extracted from the essential meaning of the practical use of nursing student experiences. The five theme clusters were: Being a learning guide, Being a medium for communication, Providing an opportunity for inner growth, Difficulties about new learning, and Would like to no more in a better way. Conclusion: The results of this study contribute to providing direction to the formation of learning portfolios, which in turn enable nursing student to develop competency in self-directed learning. These findings indicate that an outcome-based nursing curriculum needs to consider the importance for nursing student's effective application of leaning portfolio.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제16권1호
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• pp.44-51
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• 2016

Recently, artificial intelligence has reached the level of top information technologies that will have significant influence over many aspects of our future lifestyles. In particular, in the fields of machine learning technologies for classification and decision-making, there have been a lot of research efforts for solving estimation and control problems that appear in the various kinds of portfolio management problems via data-driven approaches. Note that these modern data-driven approaches, which try to find solutions to the problems based on relevant empirical data rather than mathematical analyses, are useful particularly in practical application domains. In this paper, we consider some applications of modern data-driven machine learning methods for portfolio management problems. More precisely, we apply a simplified version of the sparse Gaussian process (GP) classification method for classifying users' sensitivity with respect to financial risk, and then present two portfolio management issues in which the GP application results can be useful. Experimental results show that the GP applications work well in handling simulated data sets.

• 정보교육학회논문지
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• 제12권2호
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• pp.223-234
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• 2008

우수한 초등교사의 양성은 우수한 예비교사 교육을 통하여 성취될 수 있다. 양질의 교육은 교수자와 학습자의 다양한 상호작용과 학습자의 적극적인 참여를 통하여 실현 가능하다. 본 연구는 사회적 개인적 요구를 반영하고, 대학 강의의 질을 개선하기 위하여 컴퓨터 교과교육에서 웹기반 문제중심학습과 e-포트폴리오를 통합 적용하고 그 효과를 확인하고자 하였다. 학습자들(N = 105)은 6회에 걸쳐 문제중심학습을 수행하고, 동시에 그 학습과정을 블로그를 이용하여 e-포트폴리오를 작성하며, 학습 과정과 결과에 관한 경험 및 반성을 반성저널에 작성하였다. 학습자들의 반성저널은 질적 분석 방법을 통하여 분석하였으며 그 결과는 다음과 같다. 학습자들은 웹기반 문제중심학습과 e-포트폴리오의 적용을 통하여 컴퓨터교과교육에 대한 이해의 증진, 잠재적으로 ICT 활용 능력의 향상, ICT를 기반으로 한 학습자 중심의 교수-학습 전략의 습득, 그리고 수행평가로써의 e-포트폴리오 경험을 통해 미래의 교사에게 필요한 역량을 향상시킬 수 있었다.

• 한국가정과교육학회지
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• 제19권1호
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• pp.15-33
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• 2007

본 연구의 목적은 전통적인 평가의 대안으로 제안된 수행평가의 한 방법인 포트폴리오를 가정교과 수업에 적용하였을 때 학생들의 학습태도 향상에 효과가 있는지 알아보는 데 있다. 본 연구의 결과를 요약하면 다음과 같다. 첫째, '반바지 만들기' 단원에 총 13차시의 교수 학습지도안과 수업 활동지, 수업 자료, 평가 자료 등의 포트폴리오 자료를 개발하였다. 둘째, '반바지 만들기' 단원에 포트폴리오 자료를 적응한 수업이 학생들의 학습태도를 긍정적으로 변화시키고, 우월감, 자신감, 흥미, 목적의식, 성취동기, 주의집중, 자율학습, 교우관계 등의 향상에도 매우 효과적이었다. 셋째, 포트폴리오 적용 수업에 대한 학생들의 인식을 분석한 결과, 포트폴리오 적용 수업을 계속 진행하는 것에 대해 90% 이상의 학생이 긍정적인 반응을 보였다. 그 이유로는 '공부에 도움이 된다, 수업시간에 집중이 잘 된다, 만족감과 자신감이 생긴다, 스스로 공부하는 능력이 길러진다'라는 의견이 있었고, 반면에 포트폴리오 적용 수업의 단점으로 '포트폴리오를 작성하는데 시간이 많이 소요된다, 과제가 있어 부담스러웠다'라는 의견이 있었다. 이상의 결과로 중학교 기술 가정 의생활 단원에서 학생들의 흥미를 높이고 학습태도를 향상시킬 수 있는 교수학습 방법의 개발이 많이 이루어지기를 기대한다.

• 한국과학교육학회지
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• 제18권2호
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• pp.233-243
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• 1998

과학교육자들은 지필 중심 평가에 대해서 많은 우려를 하여 왔다. 수행평가는 전통적인 평가의 훌륭한 대안으로 여겨지고 있다. 수행평가의 하나인 포트폴리오 평가는 학생들의 창의성 신장과 자기 학습에 대한 책임감을 높이는 바람직한 특성을 가지고 있다. 그러나 이에 대한 연구나 실제 적용 사례는 매우 드물다. 포트폴리오 평가의 특성과 구조를 문헌 조사를 통하여 탐색하였다. 적절한 포트폴리오 평가의 형태와 구성 요소를 설계하였다. 우리 나라 초등 과학 수업에는 포트폴리오 평가를 위한 학습 목표는 일반 목표와 구체 목표를 내용의 특성에 따라 사용할 필요가 있다. 포트폴리오 평가를 위한 학생들의 증거는 교실에 교재의 부족과 재생 시설의 미비 때문에 제한적인 형태률 가진다. 학생들의 증거는 상당 부분이 교실에서 수업 중에 작성하는 것이 학습 부담을 줄일 수 있어서 좋다. 평가 준거는 학급당 학생수가 많기 때문에 분석적인 것보다는 전체적인 것을 사용하는 것이 바람직하다. 포트폴리오 평가는 초등학교 과학 수업에 많은 변화를 일으킬 것이다. 학생들은 과학 학습에 보다 주도적인 자세를 갖게 되고 교사들은 주요 교수 목표에 집중하고, 학생들의 바람직한 학습에 더 많은 관심을 둘 것이다. 포트폴리오 평가가 학생과 교사에게 더 많은 업무 부담을 요구하지만, 학교 과학 시간에 적용이 가능할 것으로 보인다.