• TTA REPORT
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• v.3 no.4 s.10
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• pp.10-17
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• 1991

• 발명특허
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• v.6 no.3 s.61
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• pp.22-24
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• 1981

• Korea Petroleum Association Journal
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• no.3 s.49
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• pp.104-106
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• 1985

• Journal of Advanced Navigation Technology
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• v.16 no.6
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• pp.944-951
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• 2012

The conventional indexes for describing the GNSS positioning performance such as satellite visibility, dilution of precision (DOP) and signal to noise ratio is very useful in open sky, however, they are not useful in the land road environment. In this paper new index is suggested for describing the GNSS positioning performance for the road environment. The new index is called Sky View based DOP (SVDOP). SVDOP is derived referring the Sky-View-Factor (SVF). The usefulness is analyzed by comparing the SVDOP and SVF in land road environment after the singularity points are selected and SVDOP is calculated.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.10
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• pp.4445-4452
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• 2012

This study examined the relationship between an achievement goal orientation and self-management in track & field athletes' of physical education high schools. Moreover, we hypothesized that the achievement goal orientation and self-management would be differed by their gender, special field, and career. Participants were 229 athletes. They completed achievement goal orientation and self-management questionnaires independently. Results from each statistical method based on the research questions revealed that there was a statistical difference in the subject goal orientation(p<0.05). Gender had a significant effect on the interpersonal, mental strength, and the body management(p<0.05). The mental strength was only statistically affected by their special field. The results indicated that the achievement goal orientation and the self-management may affect performance of high school track & field athletes. Several limitations, implications and suggestions for the future study were discussed.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.29 no.2
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• pp.149-159
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• 2016

In this study, the solitary wave-induced tsunami force acting on an onshore bridges in coastal area was numerically modelled by means of TWOPM-3D based on Navier-Stokes solver and VOF method which can track free surface effectively. The validity of numerical analysis was verified by comparing the experimental tsunami bore force acting on vertical wall and column structure. In particular, the characteristics of tsunami force with the changing tsunami intensity were surveyed through numerical experiments. The availability of 3-dimensional numerical analysis was reviewed through the comparison between the existing numerical results and design criteria for each drag force coefficient by applying Morison equation considering only drag force. As reasonable and high-precision estimation method of tsunami force, it was suggested to apply the estimation method taking drag and inertial force into consideration at the same time.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.12 no.3
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• pp.1128-1135
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• 2011

The purpose of this study was to identify the effects of field athletes' self-management on their psychological happiness. The subjects of the study were 184 athletes (male=82, female=102) who participated in the 91th National Athletes Meeting. All statistical analyses and description methods were computed by SPSS window 18.0. The discriminant analysis was used to find effects of self-management on their psychological happiness, ANOVA and Multiple regression. The results of this study were as followings: Frist, there was not significant difference to The Relationship between social-demographical variables and self-management, their psychological happiness. Second, self-management had a significant effect on psychological happiness. Based on the results, Field athletes's self-management has a positive effect on their psychological happiness.

• 한국지구물리탐사학회:학술대회논문집
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• 2005.05a
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• pp.255-260
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• 2005

A Gravity characteristic of Svalbard archipelago in Arctic was studied by using ArcGP data. There are situated the Dasan science station. After bouguer correction, an edge effect of free-air anomaly, which is similar to topography, are not shown at passive continent margin, and after terrain correction with GTOPO30 data, gravity anomaly increases from continent to marine. that is deep connected with rise of Moho discontinuity. The correlation of topography and free-air anomaly shows that the isostasy of continent attains a little less than marine. After filtering, the residual anomaly are shown high and low anomalies related to fracture zone in continent and base depression or thick sedimentary layer in continental slope, marine.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.6 no.8
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• pp.1241-1250
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• 2002

The communication between Ship and Land have bad communication environment and high cost comparing with land situation. In case of data communication for I-mail, the primary used speed is from 4800 bps to 9600bps. even this low speed user has difficulty to use data communication because of high cost. and this kind of data communication software is all imported from foreign country. In this paper we designed and implemented this communication server and client using Inmarsat A/B/miniM/M4/GAN(F77) by benchmarking of foreign product like Netverk, Marinet, Amosmail. the focus of this product is like next 1) communication cost down 2) Link between Ship Application and Land Office Application 3) Convenient of usage in Ship 4) perfect management of message to from ship.

• Journal of Advanced Navigation Technology
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• v.14 no.5
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• pp.632-639
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• 2010

Ground Transportation is one of the most required field that users need positioning information Especially, more precise position can make smart traffic management possible and bring convenience to users. By advanced wireless network, cars can receive the GPS information of reference station in any tim e and any where. Thus land vehicles are possible to process precise positioning. In general, for precise positioning code and phase measurements are used. But receivers provide not only code and phase measurements but also doppler measurements and Doppler is direct measurement of velocity. In this paper, because velocity is very important information required in Ground Transportation, precise positioning for Ground Transportation is studied. For precise positioning RTK(Real-Time Kinematic) was used and double differenced doppler measurements were added, As a Result, positioning error by multipath and cycle slip was soften. However there still remained Positioning error. Thus smoothing technique using doppler measurement in position domain is used for softening positioning error.