• Journal of the Korean Applied Science and Technology
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• v.35 no.3
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• pp.719-730
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• 2018

The purpose of this study was to verify the effects of motive for Rowing Academy participation on satisfaction and continuance intention. The participants were from general population who had experience of using Rowing Academy. A total of 230 questionnaires were distributed from Aug. 1 to Sep. 30, 2017 and, after excluding 29 questionnaires that had missed or inappropriate answers thus low reliability, 201 questionnaires were included in effective sample. The collected data were analyzed using IBM SPSS Statistics 21 and IBM AMOS 21, and frequency analysis, exploratory factor analysis, reliability analysis, confirmative factor analysis, association analysis, path analysis through structural equation modelling analysis were performed. The results, based on them, are as follows: First, the health orientation factor, the family orientation factor, the social relationship orientation factor, the leisure orientation factor from motive for Rowing Academy participation had significant effect on satisfaction. Second,, the satisfaction with Rowing Academy participation had effect on continuation intention.

• Journal of The Korean Association For Science Education
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• v.22 no.4
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• pp.750-756
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• 2002

The purpose of this study was to examine the effects of a treatment program by types of underachiever developed from "electric voltage and current" section in the 8th grade science textbook. The program for the underachiever who have lack of basic knowledge and needs to learning aimed to improve their achievement and attitude toward science. For this study, 171 8th grade students were sampled and distributed to control and experimental group. Among them, 54 underachievers were identified. The underachievers were defined as science achievement level is below mean and IQ is above 90. The independent variables in this study were teaching method (traditional instruction and developed instruction) and types of underachiever. The dependent variables were students' achievement and attitude toward science. Pretest-posttest control group design was used. The main results of this study were that the treatment program emphasizing learning sheet activities based on LT(Learning Together) model had significant effect for underachievers who have lack of basic knowledge and needs to learning to increase their achievement and attitude toward science.

• Communications of the Korean Institute of Information Scientists and Engineers
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• v.28 no.9
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• pp.28-39
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• 2010

• 한국지구과학회:학술대회논문집
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• 2005.09a
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• pp.287-288
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• 2005

• Journal of KIISE:Computer Systems and Theory
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• v.26 no.2
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• pp.125-135
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• 1999

• Bulletin of the Korean Space Science Society
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• 2002.05b
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• pp.40-40
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• 2002

• Journal of the Korea Academia-Industrial cooperation Society
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• v.22 no.3
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• pp.352-361
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• 2021

An underwater positioning method that can be applied to structures for underwater construction is being developed at the Korea Institute of Ocean Science and Technology. The method uses an extended Kalman filter (EKF) based on an inertial navigation system for precise and continuous position estimation. The observation matrix was configured to be variable in order to apply asynchronous measured sensor data in the correction step of the EKF. A Doppler velocity logger (DVL) can acquire signals only when attached to the bottom of an underwater structure, and it is difficult to install and recover. Therefore, a complex sensor device for underwater structure attachment was developed without a DVL in consideration of an underwater construction environment, installation location, system operation convenience, etc.. Its performance was verified through a water tank test. The results are the measured underwater position using an ultra-short baseline, the estimated position using only a position vector, and the estimated position using position/velocity vectors. The results were compared and evaluated using the circular error probability (CEP). As a result, the CEP of the USBL alone was 0.02 m, the CEP of the position estimation with only the position vector corrected was 3.76 m, and the CEP of the position estimation with the position and velocity vectors corrected was 0.06 m. Through this research, it was confirmed that stable underwater positioning can be carried out using asynchronous sensors without a DVL.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.1
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• pp.115-120
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• 2021

In this paper, an operating algorithm for single-phase permanent magnet synchronous motor based on PR current controller is proposed. In general, an asymmetric gap may occur depending on the shape of the rotor of single-phase PMSM, and this causes noise and vibration during high-speed operation. Therefore, in this paper, an operating algorithm for a single-phase PMSM usihng a proportional resonant current conrtoller with excellent control stability was proposed. Proportional resonant current controller has on steady state error is relatevly robust against distortion. Also, steady state error of AC input can be eleminated without complicated calculation process. The validity and availability of the proposed algorithm are verified through the experiment.

• Journal of KIISE:Databases
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• v.34 no.4
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• pp.357-368
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• 2007

This paper proposes the SAMD(Synchronization Algorithms based on Message Digest) algorithm based on message digest in order to data synchronization between a database server and a mobile database. The SAMD algorithm makes the images at the database server and the mobile database using message digest tables and compares two images in order to select the rows needed to synchronization. If two images are different, the synchronization is progressed according to synchronization policy. The SAMD algorithm does not use techniques which are dependent the some database vendor and also triggers, stored procedures and timestamps. The SAMD only uses the standard SQL functions for the synchronization. Therefore the SAMD algorithm is used in any combinations of the database server and the mobile database because the SAMD algorithm is not depended on some database venders. Also the SAMD algorithm shows better performance compared with existing synchronization products.

• Journal of the Korean School Mathematics Society
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• v.16 no.1
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• pp.87-112
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• 2013

Gifted education, receiving private tutoring and prerequisite learning, is emerging as a remarkable phenomenon currently in Korea. Hence, we need to find out that whether prerequisite math learning influences academic achievement in any aspect after they enter the center. In this paper, we investigate the effect of mathematics prerequisite learning of gifted students focused on the their self-efficacy, achievement motivation and academic achievement. As a result, the period of mathematics prerequisite learning did not influence academic achievement of gifted students. However, the correlation between self-efficacy and achievement motivation was positive.