• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2011년도 추계학술발표대회 논문집
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• pp.278-281
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• 2011

This system can predict the maximum output about all illumination levels so that the PV system designer can design the system having the best efficiency. For the output prediction exact about the solar cell, that is the device the basis most in the PV system, the basis has to be in order to try this way. The solution based on Lambert W-function are presented to express the transcendental current-voltage characteristic containing parasitic power consuming parameters like series and shunt resistances. A simple and efficient method for the extraction of a single current-voltage (I-V) curve under the constant illumination level is proposed. With the help of the Lambert W function, the explicit analytic expression for I is obtained. And the explicit analytic expression for V is obtained. This analytic expression is directly used to fit the experimental data and extract the device parameters. The I-V curve of the solar cell was expressed through the modeling using Lambert W-function and the numerical formula where there is the difficulty could be logarithmically expressed This method expresses with the I-V curve through the modeling using Lambert W-function which adds other loss ingredients to the equation2 as to the research afterward. And the solar cell goes as small and this I-V curve can predict the power penalty in the system unit.

• 산업공학
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• 제10권1호
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• pp.169-187
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• 1997

Recently, in organizations many decisions are being made by groups. And the organization is changing a lot so are groups. To help decision making of changing groups, we need more flexible and more adaptive GDSS. Therefore one of the critical success factors of GDSS is flexibility and incremental improvement. Prior research on specifying design requirements of GDSS suggests generic design requirements. But they are too general to be incorporated directly into system design, because of the disparity between real group and ideal group that the researchers studied. Many design strategies that start from the generic design requirements thus have contingency variables that changes as the characteristics of group change. From the viewpoint of developers, these variables implicate the desirability of flexibility. To achieve flexibility we need new methodology of design and implementation. Nowadays, object-oriented analysis and design methodologies have been progressed to the point that many systems are being developed through these methodologies. In this paper, a design is proposed using Object-Oriented Modeling Techniques(OMT). Exploiting object-oriented paradigm results in a highly flexible and easily upgradable design.

• 한국수학교육학회지시리즈D:수학교육연구
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• 제4권1호
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• pp.1-22
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• 2000

The purpose of this study was to investigate the effects of using graphing calculators on students' understanding of the linear and quadratic function concepts. The populators of this study are tenth graders at high school in Seoul, one class for the treatment group and another class for the comparison group, and experiment period is 14 weeks including two weeks for school regular exams.Function tests used in the study was proposed which described a conceptual knowledge of functions in terms of the following components: a) Conceptual understanding, b) Interpreting a function in terms of a verbal experission, c) Translating between different representations of functions, and d) Mathematical modeling a real-world situation using functions. Even though the group test means of the individual components of conceptual understanding, interpreting, translating, mathematical modeling did not differ significantly, there is evidence that the two groups differed in their performance on conceptual understanding. It was shown that students learned algebra using graphing calculators view graphs more globally. The attitude survey assessed students' attitudes and perceptions about the value of mathematics, the usefulness of graphs in mathematics, mathematical confidence, mathematics anxiety, and their feelings about calculators. The overall t-test was not statistically significant, but the students in the treatment group showed significantly different levels of anxiety toward mathematics.

• 한국과학교육학회지
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• 제37권6호
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• pp.1037-1049
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• 2017

본 연구의 목적은 배설에 대한 소집단 모델링 기반 탐구 활동에서 나타나는 중학생들의 대화적 논변활동 과정에서 담화 이동 흐름과 합의에 이르는 추론 과정을 심층적으로 탐색하는 것이다. 참여 학생들은 영재원 중학교 학생들 17명이며, 3~4명이 한 소집단을 이루었다. 배설에 대한 소집단 모델링 활동 중에서 치킨을 먹은 후 체내에서 생성되는 노폐물(암모니아)는 우리 몸에서 어떻게 될지 설명하는 초기 모델을 형성하는 활동을 대상으로 분석이 이루어졌다. 학생들의 모델링 활동 중 논변적 상호작용을 분석한 결과 다음과 같은 결과를 확인할 수 있었다. 우선, 최초의 주장이 나타나는 잠정적 합의하기, '질문하기'와 '의미 명확히 하기'가 나타나는 불확실성 해결하기와 같은 공통적인 논변활동 단계가 나타났고, 다양한 주장이 존재한 소집단에서는 합의하기 단계가 추가적으로 나타나 '주장변경하기'의 담화 이동이 나타났다. 합의에 도달하기 위해 협력적으로 다른 사람의 논변에 참여했다는 측면에서 대화적 논변활동이 나타난 것을 확인할 수 있었다. 또한, 학생들의 논변활동에서 불확실성 해결하기 단계에서 비판적 질문을 하는 과정과 합의하기 단계에서 주장을 정당화하는 추론 과정에서 소집단 합의가 일어나도록 하는 대화적 논변활동 과정을 확인할 수 있었다. 비판적 질문을 통해 기존의 주장이 강화되거나 탈락되어 학생들은 자신의 주장을 변경하거나 새로운 주장을 제시하기도 하였다. 소집단 합의가 나타나는 순간의 추론을 분석해보면, 학생들은 개인 경험에 근거한 추론을 위한 자료 출처보다 과학적 사실에 근거한 추론을 위한 자료 출처를 선호하였으며 다양한 논변의 정당화 분석틀로 정당화를 하여 소집단 주장을 공고히 하였다. 본 연구결과를 통해 과학 수업에서 대화적 논변활동 맥락을 이해하고 반영할 수 있는 교육적 함의를 제공해줄 수 있을 것이다.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제26권4호
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• pp.317-332
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• 2023

수학적 모델링 활동은 실생활에서 마주할 수 있는 상황을 수학적 모델로 변환하여 문제를 해결하는 과정으로 다양한 측면의 활용이 기대되고 있다. 수학적 모델링 활동에 대한 학생들의 인지적, 정의적 및 사회적 측면을 분석하기 위하여 초등학교 5학년 학생 10개 모둠을 대상으로 수학적 모델링 활동을 진행하고 과정 및 결과를 분석하였다. 활동 결과, 각 모둠은 실생활과 관련된 과제를 해결하기 위해 수학적인 모델을 만들고 필요한 정보를 수집하는 과정에서 수학적 개념과 원리를 적용하였다. 흥미, 수학적인 성취감 및 수학에 대한 태도에 대한 변화가 관찰되었으며 모둠원 간 협업, 의사소통을 경험하였다. 분석 결과를 바탕으로 효과적인 수학적 모델링 활동을 위한 교수학적 시사점 및 지도시 유의점을 제시하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 C
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• pp.1230-1232
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• 1999

In this research, ANN load model was built on results of field test using residential load, and then proposed ANN load model was applied to transient analysis. The results of this research are as follows. The first, component load modeling using ANN was implemented. The second, group load model was proposed by aggregation of component load. The third, proposed load model was applied to power system analysis. Therefore, Importance of load modeling and precise load modeling method was suggested in this paper.

• 한국IT서비스학회지
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• 제10권4호
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• pp.47-65
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• 2011

Business organizations are asked to create new business models utilizing current technological innovations such as ubiquitous computing technology for developing new domains of business to obtain a competitive advantage and achieve a sustainable development. This study was focused on the processes for developing new and practical business models. The purpose of this study was to propose ubiquitous sport business modeling processes from the modeling framework. In particular, this study focused on developing new, pragmatic, and effective sport business models, and this new type of business is defined as 'u-sport.' For design the business model, extensive literature reviews and case studies were conducted for benchmarking the cases and expert group review was conducted for developing u-sport business model framework. The suggested business modeling processes in this study were consisted of four phases; 1) organization strategy level setting phase, 2) business strategy level setting phase, 3) business structure level setting phase, and 4) service level setting phase. The modeling processes were verified to adapt ubiquitous sport business. This designing and modeling process is expected to play a significant role on enhancing the technology-based business environments as the process mainly focuses on the service and consumer oriented approach rather than technology and suppliers oriented approach. In conclusion, establishing sport business models by adapting the service modeling process will deliver an exponential growth and development of future ubiquitous based industry.

• International Journal of Fuzzy Logic and Intelligent Systems
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• 제15권1호
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• pp.45-52
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• 2015

Although researchers have proposed various recommendation systems, most recommendation approaches are for single users and there are only a small number of recommendation approaches for groups. However, TV programs or movies are most often viewed by groups rather than by single users. Most recommendation approaches for groups assume that single users' profiles are known and that group profiles consist of the single users' profiles. However, because it is difficult to obtain group profiles, researchers have only used synthetic or limited datasets. In this paper, we report on various group recommendation approaches to a real large-scale dataset in a TV domain, and evaluate the various group recommendation approaches. In addition, we provide some guidelines for group recommendation systems, focusing on home group users in a TV domain.

• Management Science and Financial Engineering
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• 제10권1호
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• pp.1-23
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• 2004

The changing structure of organization and the increasing diversity of business have forced organizations to have abilities to coordinate dispersed business activities. They have required cooperation and coordination among the functional units in the organization which should involve group decision-making processes. Although many group decision-making support tools and methods have been introduced to enable the collaborative process of group decision-making, they often lack the features supporting the dynamic complexity issue frequently occurring at group decision-making processes. This results in cognitive unfit between the group decision-making tasks and their supporting tools, bringing about mixed results in their effects on group decision-making. This study proposes system dynamics modeling as a group decision-making support tool to deal with the group decision -making tasks having properties of dynamic complexity in terms of cognitive fit theory.

• 한국IT서비스학회지
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• 제17권1호
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• pp.105-119
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• 2018

The healthcare business is growing as a global core business because of the phenomenon of global aging, as well as in South Korea, skyrocketing health care costs accordingly, and changing the paradigm from treatment to the prevention-centered medical service. Especially, as the digital healthcare service stands out as a solution, major countries actively promote and support policies at the government level. Thus, this study will present attributes of a market-oriented service that would vitalize the digital healthcare service industry by investigating major attributes of the digital healthcare service. To analyze the relationships of the influences of attributes, this study used Interpretive Structural Modeling. As a result of literature research and ISM, this study can understand the eight basic attributes of the digital healthcare service (network scalability, context awareness, connection among information platforms, cost, trust, security, ease of use, usefulness) and analyze the relationships of the influences among the attributes. In addition, as this study finds some significant differences in Order Winner and Order Qualifier between the experts' group (security) and the users' group (trust, ease of use, usefulness), It provides meaningful implications for revitalization and promotion of digital healthcare service industry.