• Journal of the Korean Institute of Navigation
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• v.22 no.4
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• pp.77-89
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• 1998

중국 고대선의 신비스러움은 다음 여덟 가지의 점에서 두드러지게 나타난다. 즉 격벽의 고안, 물새를 닮은 수선면, 바텐을 댄 돛의 발명, 타의 발명, 다수의 돛과 돛대를 장비하는 방법, 외륜의 발명, 그리고 역풍 항해기술의 개발이다. 이 글에서는 중국 고대선의 신비스러움을 서양 고대선과 비교하여 설명하였다.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.43 no.3
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• pp.195-203
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• 2015

In this paper, the dynamic behavior of wrinkled triangular solar sail was studied by finite element analysis. The analysis was proceeded first by performing static wrinkle analysis under tensile corner load on sail membrane, and then performing modal analysis. The membrane element method with wrinkle algorithm and the shell element post-buckling analysis method were used to account for the wrinkle deformation and the results were compared for analysis methods throughly. The comparison was also made to that without wrinkle consideration to investigate the effect of wrinkle deformation on the results. Cases with various loading cable angles were analyzed and the results were systematically examined.

• 주택과사람들
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• s.222
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• pp.28-28
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• 2008

• KOREAN POULTRY JOURNAL
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• v.28 no.3 s.317
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• pp.106-109
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• 1996

• 정보화사회
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• s.2
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• pp.5-5
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• 1988

• Journal of Aerospace System Engineering
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• v.11 no.3
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• pp.16-21
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• 2017

In this paper, we propose a new folding method (the blossom method) to increase storage efficiency of drag-sail. To resolve the issue caused by increase in the thickness of the sail, we allowed margin space (offset) along the folding line and made holes at the intersection of offset lines to prevent distortion of film. In addition, to verify applicability of the blossom method, we fabricated quarter of the sail by using Mylar film and conducted a deployment experiment. If the blossom method is applied, storage ratio (storage volume: deployed area) is 1: 68.64, that is approximately 1.88 times more than the z-fold method of folding sailing.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.42 no.10
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• pp.823-832
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• 2014

Displaced non-Keplerian orbit, center of mass is displaced from orbit plane, enables special spacecraft missions. It requires continuous thrust to maintain the orbit, and solar sail is useful for this purpose. Equations for feasible region and stability analysis are derived for non-Keplerian orbit for general continuous thrust. Differences for solar sail spacecraft are discussed. Non-keplerian orbits are classified into four types. Location-specific required accelerations for orbit maintenance are calculated. Orbit stabilities of each orbit type are analyzed and verified by numerical simulations. In order to control non-Keplerian orbit in unstable region, a control algorithm using the real-time LQR control is developed and evaluated by numerical simulations.

• Korean Journal of Ichthyology
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• v.5 no.1
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• pp.1-40
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• 1993

Fourteen species and four genera of the family Callionymidae from Korea were reviewed and provided a tentative the key to species and genera. The taxonomic position and scientific name of the family Callionymidae were recheked together with states of their distribution. Among them, two species Callionymus kitaharai and C. doryssus previously described by Chyung(1977), were found to be the same species under synonym of Repomucenus huguenini. On the other hand, two species Repomucenus leucopoecilus and Repomucenus sp. were newly added. Seven species, previously reported as the family Callionymidae from Korea, were transferred into another generic name or specific name Draculo mirabilis into Eleucherochir mirabilis, Callionymus joponicus into Callurichthys japonics, Callionymus altivelis into Synchiropus altivelis, Callionymus kitaharai into Repomucenus huguenini, Callionymus richardsoni into Repomucenus curvicornis, Callionymus lunatus into Repomucenus lunatus, Callionymus flagris into Repomucenus oalenciennei. The species of Calliurichthys japonicus, Repomucenus lunatus, Repomucenus curvicornis, Repomucenus huguenini, Repomucenus ualenciennei and Synchiropus altivelis were mainly distributed in the South Sea, while the other species of the family were mainly distributed in the Yellow Sea of Korea.

• Proceedings of the Korean Society of Fisheries Technology Conference
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• 1998.06a
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• pp.87.1-88
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• 1998

• Bulletin of the Society of Naval Architects of Korea
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• v.52 no.4
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• pp.43-52
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• 2015