• School Mathematics
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• v.13 no.3
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• pp.363-384
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• 2011

This study is based on the recognition that the school mathematics education should reinforce the heuristic and constructional aspects related with discoveries of mathematical rules and understanding of mathematical concepts from real world situations as well as the deductive and formal aspects emphasizing on mathematical contents precisely. The 11th grade students of one class from a city high school with average were chosen. They were given time to learn various functions of Excel in regular classes of "Information Society and Computer" subject. They don't have difficulty using cells, mathematical functions and statistical functions in spreadsheet. Experiment was performed for six weeks and there were two hours of classes in a week. Considering the results of this research, teaching materials using spreadsheets play an important role in helping students to experience probabilistic and statistical reasoning and construct mathematical thinking. This implies that teaching materials using spreadsheet provide students with an opportunity to interact with probabilistic and statistical situations by adopting engineering which can encourage students to observe and experience various aspects of real world in authentic situations.

• Journal of Korean Society of Rural Planning
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• v.21 no.4
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• pp.77-84
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• 2015

The purpose of this study is to interpret Landscape of Naeap Village which still preserves the Confucian culture and the traditional clans among the ideally settled villages mentioned in Joong Hwan Lee's "Taengniji" and "Joseon's Fengsui" from the time of Japanese Imperial Rule, from CPTED principles. The following are the findings of this study: First, in terms of access control and zoning, Naeap Village was controlling access from the outside with the natural environment of Banbyeoncheon River and the hills surrounding the village, the artificial environment of human-scale walls around the head house and the dead ends, and the reformation by the Confucian ideologies. Naeap Village, in particular, is prominently configured by the hierarchy of zones; the Gaehosong pine trees, Gyeongpodae, and Naeapssu by the entrance to the village are considered the village itself and the landscapes and valleys are managed by the head house. Second, the Confucian culture across the village, the traditional vegetation method that does not hide the visibility, and the workers in the farms allow natural monitoring. The surrounding visibility is also applied to the spirit of mutual cooperation in the farming society, the culture of commoners at the common well and laundry site, and the culture of ruling class at the towers and pavilions. Third, Traditional villages show the efforts to preserve and maintain the villages with the village rules, the organizational decrees of the clan, and active response to national disasters.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.14 no.4
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• pp.348-359
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• 1989

The multitree pattern recognition algorithm proposed by [1] and [2] is modified in order to improve its performance. The basic idea of the multitree pattern classification algorithm is that the binary dceision tree used to classify an unknow pattern is constructed for each feature and that at each stage, classification rule decides whether to classify the unknown pattern or to extract the feature value according to the feature ordet. So the feature ordering needed in the calssification procedure is simple and the number of features used in the classification procedure is small compared with other classification algorithms. Thus the algorithm can be easily applied to real pattern recognition problems even when the number of features and that of the classes are very large. In this paper, the wighting factor assignment scheme in the decision procedure is modified and various classification rules are proposed by means of the weighting factor. And the branch and bound method is applied to feature subset selection and feature ordering. Several experimental results show that the performance of the multitree pattern classification algorithm is improved by the proposed scheme.

• The Transactions of the Korea Information Processing Society
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• v.5 no.5
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• pp.1246-1256
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• 1998

MIB(Management Information Base), one of the key components of network management system, is a conceptual repository for the information of the various managed objects. MIB stores and manages all the structural and operational data of each managed resources. Therefore, MIB should be protected properly from inadvertant user access or malicious attacks. International standard ISO/IEC 10164-9 describes several managed object classes for the enforcement of MIB security. Those managed object classes described access control rules for security policy. But the exact authorization procedures using those newly added managed object classes are not presented. In this paper, we divide managed object classes into two groups, explicit and implicit ones, and describe the access authorization procedure in Z specification language. Using Z as a description method for both authorization procedure and GDMO's action part, the behaviour of each managed object class and access authorization procedure is more precisely and formally defined than those of natural language form.

• Journal of Korean Society of Transportation
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• v.25 no.5
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• pp.111-122
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• 2007

This paper investigates the rail service patterns by train class. The emphasis in intercity rail planning is to more efficiently use of existing station facilities. Rail transit operations are affected by the system layout and ridership patterns and by work rules. Operations are also influenced by past practices and the institutional setting. Main factors to decide train service patterns are the location, socioeconomic characteristics, land use and travel demand of the station. In this context, the travel demand of intercity rail station is of crucial significance. Tests on a KTX case shows that train service frequency can be efficiently decreased in weekday to transport the same passenger demand. The work has shown many subjects that need further research including various factors influencing on train frequency. This study serves the railroad authorities in planning and determining business strategy in the increasingly competitive environment of regional rail transport.

• Journal of The Korean Association For Science Education
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• v.23 no.1
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• pp.100-116
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• 2003

The purpose of this paper is to investigate the objectivity of scientific knowledge, focusing on Michael Polanyi's epistemology. The objectivity of scientific knowledge could be examined in epistemological and ontological view. The former relates to the rationality, but the latter to the reality. Since the middle of 20th century science philosophers have debated about the objectivity of scientific knowledge. Their opinions are divided three parts by the criteria of objectivity in relation to the rationality. Exactly Objectivism approves the rationality of scientific knowledge, and Falsificationism accepts the panial rationality, but Relativism denies any rationality. In this paper, we will study the objectivity of knowledge in relation to the subjectivity, especially throughout the theory of Kant, Kierkegaard and Wang Yang-ming. Experienced good scientist Polanyi(1946; 1958) have ever suggested the new epistemology as the name of 'personal knowledge'. He argues that scientific knowledge is personal by faith, trust, passions, tacit understanding, method rules embodied in practice. Some implications were discussed for science education from the view of Polanyi. The first holds that science class needs human voice throughout the personal commitment. The second holds that intellectual passions should he recovered. The third holds that the teacher should act like real scientist. Finally, the theory of science education should be established for ourselves.

• Journal of the Society of Naval Architects of Korea
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• v.49 no.6
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• pp.491-497
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• 2012

A hull-form for a 32,000G/T class Ro-Pax ferry has developed in accordance with a need of ferry operators to reduce fuel oil consumption(FOC) due to the drastic increase in oil prices recently and strengthening of environmental rules and regulations such as CO2 emission. A twin-skeg type is applied as the hull-form in lieu of an open-shaft type in order to improve propulsion performance. In order to achieve this object, flow control devices are installed to reduce a propeller induced vibration which is a main reason to obstruct the application of twin-skeg type passenger vessels owing to an uncomfortable vibration level. Numerical simulation by using an in-house code and a commercial code (Fluent) has performed to find out an optimum design of the flow control devices and to check an improvement in cavity volume. Model tests in Samsung Ship Model Basin are carried out to evaluate propulsion performance with the developed twin-skeg type hull and a reference hull of open-shaft type. In conclusion, it is shown that the twin-skeg type hull is better than the open-shaft in FOC by around 7% and in cavity volume by 20% as well.

• The Journal of Natural Sciences
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• v.8 no.2
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• pp.257-287
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• 1996

The late period of Choson was the renaissance of the modern literature and art of the 'common-people'. Appearance of the common-people class following the emergence of such literature and art highlighted the common costume culture and evoked a fashion. The common trend of fashion of all classes at that time included a exaggerated hair style, a jacket short and tight enough to expose the breasts, a belt looking like a sensual silhouette of a woman body were expressed. Appreciating the human body could be regarded as some social advances at that age, when all the woman's clothing behaviors were restricted and controlled by the Confucian rules. Although eroticism itself is quite dependent on the basic instinct of a human being, this way of expressing eroticism had a social significance, in that women tried to be freed from the long-lasting social bondage. Therefore, the erotic mode during the late half of Choson reflected the society as well the women's repression. In addition, was the disclosure of humanity shadowed by the crusts of the hypocritical and superficial Confucian morality. It implied advances and modernity of the literature and art of the common-people at that time.

• Journal of Korean Library and Information Science Society
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• v.51 no.3
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• pp.351-384
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• 2020

The research aims to develop the courses for librarians' continuing education to build up multicultural competencies in library services. In order to achieve the purpose, the study designed the research processes as followings: first, multicultural environment analyses with various materials such as statistics or national reports; second, librarians' and multicultural users' needs analyses of multicultural library services and library works; third, job competency analyses through reviewing related laws, rules, guidelines for library multicultural services, etc. On the basis of the results from the three-step analysis phases, the study deducted the candidate courses for librarians' multicultural education. After testing validity of the candidate courses by expert panels on library multicultural services, the research suggested the final 16 courses and follow-up research projects for designing and implementing the suggested courses in real class fields.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.5
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• pp.127-133
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• 2020

The international cancer research institute under the WHO designated fine dust as a first-class carcinogen. Particular matter refers to dust that is small enough to be invisible and floating in the air. Particular matter is mainly emitted from the combustion process of fossil fuels such as coal and oil, and is a risk factor that can cause lung disease, pneumonia, and heart disease. The Ministry of Environment recently analyzed the output data of 10 fine dust measuring stations and, as a result, announced that about 60% had an error that the existing atmospheric measurement concentration was higher. In order to accurately predict fine dust, the wind direction and measurement position must be corrected. In this paper, in order to solve these problems, fuzzy rules are used to solve these problems. In addition, in order to calculate the fine particulate sensation index actually felt by pedestrians on the street, a computer simulation experiment was conducted to calculate the fine particulate sensation index in consideration of weather conditions, temperature conditions, humidity conditions, and wind conditions.