• 한국수학교육학회지시리즈E:수학교육논문집
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• 제23권3호
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• pp.563-581
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• 2009

본 연구에서는 중국과 한국의 산학서의 서문에서 산학과 산학교육의 중요성 및 필요성을 강조하기 위하여 사용된 표현들을 살펴본다. 이를 위해 첫째 육예지일(六藝之一), 둘째 복회(伏羲) 주공(周公) 공자(孔子) 공문(孔門), 셋째 도(道) 색 미오(微奧) 정미(精微), 넷째 경세지실용(經世之實用)을 중심으로 살펴본다. 여러 산학서에서 공통적으로 보이는 이러한 표현들을 통해 산학의 활성화를 위한 산학서 저자들의 노력을 되짚어 보고자 한다.

• 한국가정과교육학회지
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• 제6권2호
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• pp.59-71
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• 1994

The purpose of this study was to analyze the problems of housing education in Home Economics and then to present some suggestion for improving the housing education in the middle school and to analyze the problems of housing edcation that was investigated on the recognition and application in real life of housing area subject to male/female students in the middle school. The respondents were 600 boys and girls of middle school. Statistical methods adopted for data analysis were Frequency, Chi-square, t-test, F-test. The major findings were follows: 1. Many students(67.2%) responded that housing of home economics was wholly helpful in the actual life. 2. Many students recognized the necessity for the housing education. They particularly recognized the need about the knowlidge of sanitation and facilities of housing. 3. The degree to which housing education applied in the real life was lower than that to which it was needed. 4. There was a tendency that the more students realized the usefulness of housing education, the more positively they applied it in the real life. 5. The contents that students preferred to be additionally included in housing education were improvement of residential environment, solutions to housing environmental deterioration and pollution, future housing, and housing for the elderly.

• 한국정보시스템학회지:정보시스템연구
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• 제14권2호
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• pp.133-154
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• 2005

The objective of this study is to find the factors influencing the use of mobile service. We extracted critical study variables according to literature reviews about adoption of information systems, those under the internet environment and mobile internet adoption for theoretical foundation. TAM suggested by Davis(1985) has explained the acceptance mechanism with the following constructs: perceived usefulness, perceived ease of use, attitude toward use, behavioral intention and actual usage. After studying prior literature reviews, this study investigated the group of people using mobile services. The result of study claims that it has same results with previous TAM, especially between personal innovativeness and attitude toward use have strong statistical relations. On the other hand, there haven't been any statistical relations between perceived ease of use and perceived usefulness and between perceived usefulness and behavioral intention, either. In conclusion, use of mobile service can be promoted by developing various kinds of mobile service, designing device and interface to use mobile service more convenience and familiar, stimulating user's innovative characters and recognizing mobile service more useful in real life.

• East Asian mathematical journal
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• 제30권2호
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• pp.149-172
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• 2014

The problems of optimization addressed in the high school curriculum are usually posed in real-life contexts. However, because of the instructional purposes, problems are artificially constructed to suit computation, rather than to reflect real-life problems. Those problems have thus limited use for teaching 'practicalities', which is one of the goals of mathematics education. This study, by utilizing 'GeoGebra', suggests the optimization problem solving related to the quadratic curve, using the contour-line method which contemplates the quadratic curve changes successively. By considering more realistic situations to supplement the limit which deals only with numerical and algebraic approach, this attempt will help students to be aware of the usefulness of mathematics, and to develop interests in mathematics, as well as foster students' integrated thinking abilities across units. And this allows students to experience a variety of math.

• 한국정보시스템학회지:정보시스템연구
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• 제15권3호
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• pp.233-252
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• 2006

Recently, negative sides of internet, internet and/or game addiction and unethical behavior over internet, have been largely publicized in our society. There have been numerous studies to explore the problems and solutions, but these lack considering broader set of research variables. Therefore, this research investigated how i) internet users' self characteristics and ii) cognitive characteristics toward internet influence iii) internet addiction and iv) information ethics respectively. Especially, this study focused on college students, more mature beings than elementary, middle and high school students with whom most other researches have dealt so far. Major findings of this study are as follows: (1) Willingness to develop relationships over internet, usefulness of internet use, a degree to perceive the cyber space as real, and a degree to express self over internet have significant effects on disabled life style. Self respect willingness to develop relationships over internet, usefulness of internet use, a degree to perceive the cyber space as real, and capability of using internet have significant effects on the lack of control over internet. Willingness to develop relationships over internet, self control, and a degree to express self over internet have significant effects on the lack of control over internet. 2) Regarding the effects of independent variables(self characteristics and cognitive characteristics) on information ethics through internet addiction factors, self respect self control, a degree to perceive the cyber space as real, and capability of using internet have directly and indirectly significant effects on information ethics through internet addiction. Then we suggested four approaches to reduce the internet addiction and improve the information ethics based on the findings.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권1호
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• pp.27-34
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• 2013

클라우드 컴퓨팅 서비스에 대한 관심이 높아지고 있다. 하지만 많은 관심에도 불구하고 클라우드 컴퓨팅 서비스에 대한 기존 연구는 한계점이 있다. 선행연구들은 이 서비스가 제공하는 많은 혜택에 대한 연구와 이 서비스를 선택할 경우 발생할 수 있는 문제점에 대해 독립적으로 연구하고 있다. 하지만 실제 생활에서 소비자는 클라우드 컴퓨팅 서비스를 선택할 경우 혜택과 비용에 대해 동시에 고려한다. 따라서 본 연구에서는 클라우드 컴퓨팅 서비스 선택 시 혜택과 비용에 대한 상호작용 효과를 탐색적으로 분석하였다. 분석 결과 독립변수로써 유용성, 사회적영향, 그리고 혁신성은 인지된 가치에 모두 정(+)의 유의한 영향을 주었다. 하지만 혜택과 비용과의 상호작용 효과 분석 결과 유용성과 혁신성만이 비용과의 인지된 가치에 대해 통계학적으로 유의한 것으로 나타났다. 유용성은 비용과의 인지된 가치에 대해 상호작용 효과에 대해 음(-)의 결과가 나타났으며, 혁신성은 비용과의 인지된 가치에 대해 상호작용 효과 검정 결과 정(+)의 상호작용 효과가 있는 것으로 나타났다. 결국 본 연구는 클라우드 컴퓨팅 서비스를 선택할 경우 소비자가 느끼는 혜택의 경우 비용을 고려할 때 인지된 가치에 서로 다른 영향을 줄 수 있음을 실증했다는 점에서 의의가 있다고 하겠다.

• 한국멀티미디어학회논문지
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• 제21권11호
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• pp.1254-1262
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• 2018

Many parallel lines may be shown in our real life and they are useful for analyzing structure of objects or buildings. In this paper, a vision based technique for estimating three-dimensional direction of parallel lines is suggested, which uses a calibrated camera and is applicable to an image being captured from the camera. Correctness of the technique is theoretically described and discussed in this paper. The technique is well applicable to measurement of orientation of a pallet in a warehouse, because a pair of parallel lines is well detected in the front plane of the pallet. Thereby the technique enables a forklift with a well-calibrated camera to engage the pallet automatically. Such a forklift in a warehouse can engage a pallet on a storing rack as well as one on the ground. Usefulness of the suggested technique for other applications is also discussed. We conducted an experiment of measuring a real commercial pallet with various orientation and distance and found for the technique to work correctly and accurately.

• Structural Monitoring and Maintenance
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• 제7권2호
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• pp.149-166
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• 2020

This paper presents the results of an experimental investigation on a vibration-based damage identification framework for a steel girder type and a truss bridge based on acceleration responses to operational loading. The method relies on sensor clustering-based time-series analysis of the operational acceleration response of the bridge to the passage of a moving vehicle. The results are presented in terms of Damage Features from each sensor, which are obtained by comparing the actual acceleration response from the sensors to the predicted response from the time-series model. The damage in the bridge is detected by observing the change in damage features of the bridge as structural changes occur in the bridge. The relative severity of the damage can also be quantitatively assessed by observing the magnitude of the changes in the damage features. The experimental results show the potential usefulness of the proposed method for future applications on condition assessment of real-life bridge infrastructures.

• 한국경영과학회지
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• 제31권2호
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• pp.87-98
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• 2006

In many cases of cluster analysis we are forced to perform clustering without any prior knowledge on the number of clusters. But in some clustering methods such as k-means algorithm it is required to provide the number of clusters beforehand. In this study, we focus on the problem to determine the number of clusters in the given data. We follow the 2 stage approach of ASA clustering algorithm and mainly try to improve the performance of the first stage of the algorithm. We verify the usefulness of the method by applying it for various kinds of simulated data. Also, we apply the method for clustering two kinds of real life qualitative data.

• Asia pacific journal of information systems
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• 제6권1호
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• pp.165-194
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• 1996

Data distribution is one of the most important steps in distributed database design. This paper proposes a methodology for distributing database by using a relational schema as an input. A design support system called DBDD (Database Distribution Design) is implemented within the framework of this methodology. The methodology consists of three phases such as (i) schema analysis, (ii) fragmentation, and (iii) allocation. In the schema analysis phase, all the table names are acquired from a global relational schema. In the fragmentation phase, fragments are generated according to transaction retrieval patterns. Furthermore, DBDD enhances the design quality by allocating fragments in a progressive manner. A real-life case is illustrated to demonstrate the practical usefulness of the DBDD.