• Proceedings of the Korean Ceranic Society Conference
• /
• 2000.10a
• /
• pp.75.1-75
• /
• 2000

• Bulletin of the Korean Chemical Society
• /
• v.24 no.9
• /
• pp.1351-1353
• /
• 2003

• Journal of Korean Elementary Science Education
• /
• v.33 no.4
• /
• pp.773-783
• /
• 2014

In National Curriculum of Science revised in 2007, the Free Inquiry was newly introduced to increase students' interest in science and to foster creativity by having students make their own question and find answer by themselves. The purpose of the study was to analyze characteristics, in cognitive domain, appeared in the processes of performing the Free Inquiry activities applying a brain-based evolutionary science teaching and learning principles. For this study, 106 fifth grade students participated, and they performed individually Free Inquiry activities. In order to characterize of the diversifying, estimating-evaluating-executing, and extending-applying activities in cognitive domain (C-DEF), the Free Inquiry diary constructed by the students, observations by a researcher, and interviews with the students were analyzed both quantitatively and qualitatively. The major results of this study were as follows: First, at C-D step, many students (71.5%) had difficulty in searching the meanings of their results and the contents of interpretations were at the level of simple description of their results. A few students (15.2%) derived interpretations based on causal relationships between specific variable and result. Also, the tendency that the numbers of interpretation about meaning of their results were increased as the scores of science attitude and achievement was appeared. Second, at C-E step, the students showed tendency of considering facts exactly explaining inquiry topic and being appliable to daily life rather than objectivity or accuracy of scientific knowledge. Third, at C-F step, there were three types of extension and application: simple repetition (8.2%), extension (64.0%), and upward application (17.6%) types. Based on these findings, implications for supporting appropriate interpretation, evaluation, and application of inquiry results are discussed.

• The Journal of Sustainable Design and Educational Environment Research
• /
• v.18 no.1
• /
• pp.17-26
• /
• 2019

Barrier-free design reflects the attention of the disadvantaged groups. As a populous country with the largest population and the largest number of elderly people, China has made great progress in the field of the Barrier-free. The scope of this thesis is from the 1980s to 2012 in China, studying the development process of China's barrier-free design standards by comparing the two barrier-free design standards implemented in the history of such design. In this paper, the two standards are compared and analyzed in the following aspects, which are the numbering, chapters, scope of application, applicable objects and purposes, and so on. Compared with the 2001 barrier-free design standards, the 2012 one can be concluded that the development of barrier-free design in China has been accelerated, the scope of application has been widened than before, the content has been supplemented, and restrictions on terms have been reduced.

• Bulletin of the Korean Chemical Society
• /
• v.26 no.7
• /
• pp.1035-1036
• /
• 2005

• Bulletin of the Korean Chemical Society
• /
• v.17 no.11
• /
• pp.1009-1018
• /
• 1996

A study on the application of vinyl radical cyclization via free radical allylation reaction in the synthesis of various carbocyclic compounds is described. In connection with this study, a new allyl transfer reagent, 2-bromo-3-(phenylthio)propene 1 is developed and it was shown that vinyl radical cyclization through free radical allylation reaction using reagent 1 provides a valuable approach to carbocyclic systems with a reactive exo-alkylidene moiety, which is advantageous for further transformations.

• Structural Engineering and Mechanics
• /
• v.8 no.1
• /
• pp.19-26
• /
• 1999

Superior performance of field consistent eight-node hexahedron element in static bending problems has already been demonstrated in literature. In this paper, its performance in free vibration is investigated. Free vibration frequencies of typical test problems have been computed using this element. The results establish its superior performance in free vibration, particularly in thin plate application and near incompressibility regimes, demonstrating that shear locking, Poisson's stiffening and volumetric locking have been eliminated.

• Journal of the Korea Institute of Military Science and Technology
• /
• v.5 no.2
• /
• pp.62-71
• /
• 2002

A free oscillation technique for obtaining the dynamic stability derivatives in yaw is applied to the pure yawing motion. The procedure of wind tunnel testing is to compute the derivatives after measuring deflecting angles of the model during the free oscillating motion. The charging compressed air is supplied for the initial excitation. The results of this experiment predicted feasible characteristics of the yawing motion, comparing with the data previously reported in the literature.

• Structural Engineering and Mechanics
• /
• v.3 no.1
• /
• pp.25-34
• /
• 1995

General free vibration characteristics of cantilevered circular cylindrical tanks are analyzed using the integral equations technique with the cubic spline functions. For computations, the partial differential equations for thin shallow shells as given by Flugge's have been employed after the addition of the inertia forces. The application of the method is illustrated with a numerical examples of tanks which are free at the top edge and fixed at the bottom. The results obtained by this method have been compared with the available results and a good agreement was found.

• Geophysics and Geophysical Exploration
• /
• v.19 no.3
• /
• pp.164-173
• /
• 2016

Cable-free seismic technology is to acquire seismic data with independent receivers which are not connected by cables. This is an effective method for survey designs with less topographical conditions. With technology advancement for cable-free receivers, reliable data quality, easy deployment, and picking up the receivers, the cable-free technology has begun to apply to land seismic acquisition. In this study we introduced a cable-free seismic system and its equipment. We tried to build up the cable-free seismic technology through the field application. In the seismic tomography field applications, the seismic signals of the cable-free receiver and cabled receiver with the same distance from the source show the same phase in early stage. The difference of the first arrival times between two signals is less than 0.4 ms, which could be accepted. In the field application for seismic reflection exploration, we acquired shot gathers with different source depth and dynamite charge. The shot gathers from cable-free and cabled system are similar to each other. With an efficient method for receiver deployment and survey design, the application of the cable-free technology will increase.