• Journal of Educational Research in Mathematics
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• v.14 no.4
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• pp.435-447
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• 2004

There are divergent opinions about condition of triangle-determining. The purpose of this study was to compare those opinions and to identify cause of this phenomena. As a result of our study, we got to find out significant characteristics of proposition related to condition of triangle-determining. These aspects shows what cause of that phenomena is. First, that proposition is used as a theortical tool, not as a practical one. Second, that proposition presupposes that a triangle exists. Third, that proposition is connected with minimality and generality. However, our analysis is for teacher, not for student. Thus, we suggest a guiding principle as well as a guiding method in relation to teaching of that proposition.

• Journal of the Korea Computer Graphics Society
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• v.25 no.3
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• pp.31-41
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• 2019

A fog screen consists of tiny water drops and the viewers see the image transmitted through the fog screen. In contrast to ordinary screens, the viewers can see the actors passing through the image on the fog screen on stage. In this paper, we describe methods to build a top-down fog screen where fog particles generated in top space fall by gravity forming a flat vertical screen. We use a fog generation technique in which fog particles come out of the water surface when ultrasound vibrators immersed in water tank vibrate. We describe how fog particles form a flat screen while coming out of the fog passage tunnel, by generating guiding winds beside the fog screen. This technique utilizes the principle that fog particles are generated on the surface of a water tank by an ultrasonic vibrator placed in a water tank. The technique of forming a guiding wind on both sides of the passage exit where the fog comes out and the design and manufacturing method of the fog screen generating device are described so that the generated fog group can maintain one plane.

• Journal of the Korean Society of Marine Environment & Safety
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• v.27 no.5
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• pp.557-565
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• 2021

Path-following control is considered as one of the most fundamental skills to realize autonomous navigation of marine vessels in the ocean. This study addresses with the path-following control for a ship in which there are environmental disturbances in the directions of the surge, sway, and yaw motions. The guiding principle and back-stepping method was utilized to solve the ship's tracking problem on the reference path generated by a virtual ship. For path-following control, error dynamics is one of the most important skills, and it extends to the research fields of automatic collision avoidance and automatic berthing control. The algorithms for the guiding principles and error variables have been verified by numerical simulation. As a result, most error variables converged to zero values with the controller except for the yaw angle error. One of the most interesting results is that the tracking errors of path-following control between two ships are smaller than the existing safe passing distances considering interaction forces from near passing ships. Moreover, a trade-off between tracking performance and the ship's safety should be considered for determining the proper control parameters to prevent the destructive failure of actuators such as propellers, fins, and rudders during the path-following of marine vessels.

• Journal of Korean Society of Archives and Records Management
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• v.12 no.3
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• pp.203-232
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• 2012

The study aims at reviewing research trends of records classification and archival arrangement, analysing issues, and suggesting futures tasks in related research area. It starts with defining research categories of records and archives classification through analysing the term of 'classification' being found in the Public Records Management Act. Thirty five research papers which are covering classification of records and archives and published in 1980's are selected for contents analysis. Considering the analysis of domestic and foreign research, and the practical needs, it makes clear the issues and tasks for future research. The study concludes with emphasizing more empirical research for guiding records and archives management and reformulating archival theories in electronic environments.

• The Korean Society of Law and Medicine
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• v.13 no.2
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• pp.263-284
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• 2012

Medical Act. article 2 (3) stipulates that "a korean medicine doctor is in charge of providing korean medical practices and korean medical health guidance". But, without a definition article about korean medical practice, the legal concept of it is defined by supreme court cases according to specific legal trials. To establish the concept of korean medical practice, it must be included that the common parts of practice of medicine involving "the purpose of practice", "the subject of practice", "the object of practice" and "other dangers", as well as the special parts of conceptual elements of korean medical practice involving "korean medicine principle" and "differentiation" and also "manufacturing of korean medicine". Accordingly, the definition of korean medical practice is defined as examining, diagnosing, differentiating, prescribing, manufacturing of korean medicine, treating, korean medical care guiding so as to treat diseases and to promote and to maintain health, based on korean medicine as traditionally handed down from the nation's ancestors and korean medicine principle which is scientifically developed and applied and also includes a practice that will cause physiological danger to human body and/or bring harm to public health and sanitation if it is not perfomed by korean medicine doctor.

• Journal for History of Mathematics
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• v.26 no.1
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• pp.85-101
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• 2013

This study is to analyse the characteristics of Barrow's theorem on the historical standpoint of hermeneutics and to discuss the teaching-learning sequence for guiding students to reinvent the calculus according to historico-genetic principle. By the historical analysis on the Barrow's theorem, we show the geometric feature of the theorem, conjecture the Barrow's intention in dealing with it, and consider the epistemological obstacles undergone by Barrow. On a basis of this result, we suggest a purposeful and meaning-oriented teaching-learning way for students to realize the sameness of the 'integration' and 'anti-differentiation', and point out the shortcomings and supplement point in current School Mathematic Calculus.

• Korean Journal of Optics and Photonics
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• v.17 no.3
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• pp.209-215
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• 2006

Circular Bragg gratings(CBGs) canbe incorporated in most of the semiconductor laser devices because of the frequency-selective property applicable as an optical narrowband-pass filter in DWDM optical communications. In this paper, the optical filtering characteristics of CBGs are evaluated by a novel and simple analytic modal transmission-line theory(MTLT), which is based on Floquet-Babinet's principle. The numerical results reveal that this method offers a simple and convenient algorithm to analyze the filtering characteristics of CBGs as well as is extended conveniently to evaluate the guiding problems of circular multi-layered periodic structures.

• 한국사회정책
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• v.25 no.2
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• pp.3-29
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• 2018

By examining care from a normative perspective projected in the Constitution of South Korea, this paper attempts to assess care from the standpoint of justice and establish the status of care as a concrete political value. The point that this paper focuses on in the Constitution is about the "human worth and dignity" and "right to pursue happiness" clauses of the Article 10 at the beginning of Chapter II which defines the rights and duties of citizens. The clauses of "human worth and dignity" and the "right to pursue happiness" are generally interpreted as the highest values of the constitutional order. While exploring the human dignity and the pursuit of happiness clauses in light of care, this paper intends to address the value of care as human dignity, which is the highest ideology and constitutional principle of the Constitution and, at the same time, the limitation of explaining the freedom to care with a liberal concept of freedom implied in the pursuit of happiness. Ultimately, this paper argues for the justification of putting 'care' in the Constitution. In the end, this paper aims to emphasize the significance of care as a guiding principle for the maintenance of our lives and society, a primary principle of social regulation and public governance, and a direction for a just state which can identify and rectify care injustices.

• Journal of the East Asian Society of Dietary Life
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• v.8 no.2
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• pp.137-146
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• 1998

This study was designed to investigate the main sources of food and nutrition, utilization, reliance, nutritional knowledge and dietary behavior. The results are as follows. 1. The main sources of food and nutritional information are television and radio, newspaper and popular magazines in that order. 2. The first topic is a guiding principle in the dietary life of adult disease prevention. 3. The percentage of the perceived nutritional knowledge of respondents using the newspaper and popular magazines is higher than for the respondents using the television and radio, but the accuracy of the nutritional knowledge was not significant. Per the results, the nutritional education of people through the mass media is very reasonable, Therefore, it is necessary to develop a nutritional education program and implement the program using the most practical mlethod to deliver the information.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2000.11c
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• pp.707-714
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• 2000

For self-guiding track-type orchard sprayer, a low-cost steering controller was developed using two ultrasonic sensors, two DC motors and 80196kc microprocessor. The operating principle of controller was to travel the sprayer between artificial targets such as wood stick placed every 1 m along both sides of the demanded path of speed sprayer. Measuring distances to both targets ahead with the ultrasonic sensors mounted on the front end of sprayer, the controller could determine how much offset the position of sprayer was laterally. Then the steering angle was calculated to actuate DC motors connected to the steering clutches, where the fuzzy control algorithm was used. Equipped with the controller developed in this research, the sprayer could be traveled along demanded path, the centerline between targets, at speeds of up to 0.4m/sec with an accuracy of ${\pm}$20cm.