• The KIPS Transactions:PartB
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• v.11B no.5
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• pp.563-572
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• 2004

Sentence ion is a simplification of a sentence preserving its communicative function. It accomplishes sentence revision and concept ion simultaneously. Sentence revision is a method that resolves the discrepancy between human's thoughts and its expressed semantic in sentences. Concept ion is an expression of general ideas acquired from the common elements of concepts. Sentence ion selects the main constituents of given sentences and describes the upper concepts of them with detecting their semantic information. This enables sen fence revision and concept ion simultaneously. In this paper, a syntactic parser LGPI+ and an ontology OfN are utilized for sentence ion. Sentence abstracter SABOT makes use of LGPI+ and OfN. SABOT processes the result of parsing and selects the candidate words for sentence ion. This paper computes the sentence recall of the main sentences and the topic hit ratio of the selected sentences with the text understanding system using sentence ion. The sources are 58 paragraphs in 23 stories. As a result of it, the sentence recall is about .54 ～ 72% and the topic hit ratio is about 76 ～ 86%. This paper verified that sentence ion enables sentence revision that can select the topic sentences of a given text efficiently and concept ion that can improve the depth of text understanding.

• Proceedings of the Korea Information Processing Society Conference
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• 2002.04a
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• pp.531-534
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• 2002

본 논문에서는 문서요약의 한 방법으로 문장추상화를 생각하였다. 이에 문장추상화의 판단기준이 되의 한 방법으로 문장추상화를 생각하였다 이에 문장추상화의 판단기준이 되는 요소들을 구문분석기를 통해 얻은 정보와, 문장의 구성성분들이 가지는 온톨로지 정보를 바탕으로 선정하였다. 문장추상화에는 Roget 시소러스에 기반한 온톨로지 OfN, 구문분석기 LGPI+, 그리고 이를 활용하는 문장추상기 SABOT를 이용하였다. 본 논문을 통하여 문장추상화가 문서 과정에 동원할 수 있는 유용한 도구임을 보였다.

• Proceedings of the Korean Society for Cognitive Science Conference
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• 2002.05a
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• pp.51-56
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• 2002

본 논문에서는 문서요약을 위한 문장교열 방법론으로 문장추상화를 생각하였다. 이에 문장추상화의 판단기준이 되는 요소들을 구문분석기를 통해 얻은 정보와, 문장의 구성성분들이 가지는 온톨로지 정보를 바탕으로 선정하였다. 문장추상화에는 Roget 시소러스에 기반한 온톨로지 OfN, 구문분석기 LGPI＋ 그리고 이를 활용하는 문장추상기 SABOT를 이용하였다. 본 논문을 통하여 문장추상화가 문서요약을 위한 문장교열 방법의 하나로 가능함을 보였다.

• 한국전산유체공학회:학술대회논문집
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• 1998.05a
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• pp.82-89
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• 1998

There are many moving-body problems to be solved, the solution of which necessary for proper design of flight vehicles in aerospace industry. Since a body moves relative to other bodies in the category of these problems, difficulty arises regarding both generation of computational grid around the body in motion and conservation of flow properties in the moving grid system. A few example could be store separation from the aircraft and relative vibration of multiple bodies in the high-speed flow passage. In this paper we report on the progress made in computing moving-body aerodynamics related with sabot separation characteristics. Conservative overlapping grid together with cell-merging-unmerging technique is used to solve the Euler equations for a body in high-speed motion. Carbuncle errors has to be removed before we obtain physically adequate solution. Two-dimensional application is reported here.

• Conservation Science in Museum
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• v.7
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• pp.63-68
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• 2006

Gwangju National Museum performed conservation treatment of clogs excavated from the remains related to Yun Sundo in Bogildo, Wando Island; the remains had been excavated and surveyed by Jeonnam Cultural property Research Center. The tree type used for the clogs was identified as Pinus sp. (hard pine); it was treated with PEG-vacuum freeze-drying after the t-butanol replacement.

• Journal of the Korea Institute of Military Science and Technology
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• v.5 no.2
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• pp.37-49
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• 2002

In this paper, flyout stability of missile that is launched in inclined launcher using sabots is analyzed. To include missile bending motion during flyout, FEA model of missile is converted into eight concentrated mass and equivalent stiffness matrix. Six d.o.f ship motion that have influence on flyout stability is modeled and missile firing time is modeled as probability variable to take arbitrary ship attitude into account. Gap between missile and sabot is modeled as normal distribution probability variable and Monte Carlo simulation is performed. As results, the coriolis acceleration effects by ship motion are analyed and statistical results of missile pitch rate are shown.

• Journal of the Korea Institute of Military Science and Technology
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• v.20 no.1
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• pp.55-62
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• 2017

For evaluating a large caliber ammunition tests, indoor ballistic test range is required to reduce the noise and fragments occurring during the test. To ensure the reliability of the indoor ballistics test range design, we carried out the analysis of the indoor test range using the AUTODYNE hydrodynamic code before its construction. The 120 mm tank ammunition is adopted as a reference model and we analysed the characteristics of the pressure distribution at fire area, the structure design at impact area, the over-pressure applied to the tunnel, and the sabot stopper design. The results of the analysis were applied to the design of the indoor ballistic test range.

• Composites Research
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• v.17 no.2
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• pp.15-20
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• 2004

It is a primary object of the present study to test and evaluate the shear load carrying capability of a carbon fiber reinforced thermoses composite structure with buttress grooves for military applications. The buttress form of groove is an effective structure in any applications where high shear loads are transferred in one direction between structural components. Inverse ballistics methodology was introduced to investigate the high strain rate properties of composite groove specimens. In comparison with the conventional methods, inverse ballistics technique is a proper one under dynamic environment.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.2
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• pp.322-327
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• 2020

An Armor Piercing Fin Stabilized Discarding Sabot (APFSDS), which penetrates and sabotages the target by physical energy, consists of a general penetrator using Depleted Uranium (DU) or Tungsten Heavy Alloy (THA) but THA is preferable because of manufacturing and environmental issues. On a THA penetrator, the penetration performance is determined mainly by self-sharpening depending on the hardness and toughness of materials. In particular, the tensile strength and impact strength work as key factors. The correlation coefficient for the penetration performance of the tensile strength was 0.721 and the impact strength was -0.599. The improved penetration performance by additional heat treatment was proven experimentally. Therefore, maintaining elongation over 9 % and tensile strength over 123 kg/㎟ is desirable, and the impact strength should be less than 6.8 kg·m/㎠ for good penetration performance.