• International Journal of Aerospace System Engineering
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• 제4권1호
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• pp.9-12
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• 2017

In this study, an investigation on mechanical properties of flax natural fiber composite is performed as a precedent study on the design of eco-friendly structure using flax natural fiber composite. The Vacuum Assisted Resin Transfer Molding-Light (VARTML) manufacturing method is adopted for manufacturing the flax fiber composite panel. The VARTML is a manufacturing process that the resin is injected into the dry layered-up fibers enclosed by a rigid mold tool under vacuum. In this work, the resin flow analysis of VARTM manufacturing method is performed. A series of flax composite panels are manufactured, and several kinds of specimens cut out from the panels are tested to obtain mechanical performance data. Based on this, structural design of chemical storage tank for agricultural vehicle was performed using flax/vinyl ester. After structural design and analysis, the resin flow analysis of VARTM manufacturing method was performed.

• 한국군사과학기술학회지
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• 제18권5호
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• pp.548-557
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• 2015

This paper is results on Chemisorption of organic compound for the sea water fire fighting line of naval vessels. The quantitative analysis of Chemisorption has been investigated in seawater after immersion in 0.1 % of NaDDTC solutions for 43 hours. The morphology and topography were investigated by FE-SEM and AFM. The chemical elements were analyzed by SEM-EDS, XPS and the depth of chemical elements was measured by depth profiles. The effect of NaDDTC comes from Chemisorption between Copper and Sulfur of NaDDTC. As a result, test results showed that sulfur is helpful to protect a corrosion of seawater line.

• Bulletin of the Korean Chemical Society
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• 제15권12호
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• pp.1064-1069
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• 1994

Chlorobis(isoprene)rhodium(Ⅰ) (3), prepared by olefin-exchange reaction of chlorobis(cyclooctene)rhodium dimer (2) with isoprene, reacted with benzaldimine 4 to give iminoacylrhodium(Ⅲ) ${\eta}^3$-1,2-dimethylallyl complex 6. Ligand-promoted reductive elimination of 6 by pyridine and P(OMe)$_3$ produced ${\beta},{\gamma}$-unsaturated ketimine 8, which was readily hydrolyzed to give ${\beta},{\gamma}$-unsaturated ketone 9. Other methyl branched dienes such as 2,3-dimethylbutadiene, 3-methyl-1,3-pentadiene, 2-methyl-1,3-pentadiene, 2,4-dimethyl-1,3-pentadiene, 3-methyl-1,4-pentadiene and 2-methyl-1,4-pentadiene, were applied the synthesis of ${\beta},{\gamma}$-unsaturated ketones. In case of 2,4-dimethyl-1,3-pentadiene, only ${\gamma},{\delta}$ -unsaturated ketone 25, 1,2-addition product, was obtained, may be due to the mono-olefin coordination.

• Bulletin of the Korean Chemical Society
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• 제13권6호
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• pp.625-627
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• 1992

This article deals with the synthesis and characterization of poly [N-(propargyloxy)phthalimide][poly (POPI)]. The polymerization of POPI was carried out by various transition metal catalysts. $MoCl_5$-based catalysts were found to be more effective than $WCl_6$-based catalysts. However, the polymer yield was relatively low (maximum 35%). The polymerization of POPI by $PdCl_2$ gave poly (POPI) in fair yields in DMF and pyridine. The resulting poly (POPI)s were mostly insoluble in organic solvents. The infrared spectrum of poly (POPI) showed no peak at 2135 $cm^{-1}$ due to acetylenic $C{\equiv}C$ stretching frequency. Instead, the carbon-carbon double bond stretching frequency was observed at 1600-1650 $cm^{-1}$. The TGA thermogram showed that the present poly (POPI) is thermally stable up to $160^{\circ}C.$.

• Current Optics and Photonics
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• 제3권3호
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• pp.243-247
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• 2019

We have developed a compact, wavelength-selectable, Q-switched Nd:YAG laser at mid ultraviolet for chemical warfare agent detection. The fundamental wave at 1064 nm is delivered by a pulsed solid state laser incorporating with a square-type Nd:YAG rod in a resonator closed by two crossed Porro prisms for environmental reliability. The output energy at 213 nm ($5{\omega}$) and 266 nm ($4{\omega}$) by ${\chi}^{(2)}$ process in the sequentially disposed BBO crystals are measured to be 6.8 mJ and 15.1 mJ, respectively. The output wavelength is selected for $5{\omega}$ and $4{\omega}$ by a motorized wavelength switch. The energy ratio of the $5{\omega}$ to the $4{\omega}$ is varied from 0.05 to 0.85 by controlling the phase matching temperature of the nonlinear crystal for sum-frequency generation without change of the output pulse parameters.

• 한국재난정보학회 논문집
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• 제11권3호
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• pp.400-405
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• 2015

북한의 화생방무기 운용체계는 세계적으로 상당한 수준에 도달해 있다. 이에 미국은 화생방 공격에 대비하여 다양한 형태의 대피소를 확보하고 있으며 재난특성을 고려해 등급별로 구분하여 운용하고 있는 실정이나, 한국은 재난특성에 대한 고려 없이 무분별하게 대피소를 지정해 효과적인 방호능력을 기대하기 어려운 실정이다. 이에 본 연구는 기존에 사용되는 시설물 현황에 대하여 살펴보고 화생방 대피시설로의 전환이 용이한 시설물을 선별하기 위해 시설별 특성을 파악하였으며 연구를 통해 얻은 결과 및 제안사항을 제시하고 있다.

• 한국군사과학기술학회지
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• 제21권6호
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• pp.886-893
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• 2018

U.S. and the allies attacked chemical weapons sites in Syria in 2018, and verbal battles are carried out about the effectiveness of the air strike. Syria claimed 13 missiles were shot down, and Russia claimed 71 missiles were shot down while the U.S. released pictures of completely destroyed targets, only. It led controversy about the effectiveness of missile defense system. If there is a method to observe mission success rate of the air strike, it can not only improve combat awareness but also can be a good sales strategy in military industry. This paper describes effects and considerations of a Weapon Data Link(WDL) technology which can be used as a smoking gun of effectiveness. The paper describes WDL abilities such as In-Flight Track Update, Loiter, and Bomb Hit Indication etc., and presents examples of expected effectiveness of the WDL. In addition, this paper briefly summarizes operational consideration for better performance.

• Bulletin of the Korean Chemical Society
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• 제29권11호
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• pp.2202-2204
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• 2008

• 한국재난정보학회 논문집
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• 제10권3호
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• pp.358-365
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• 2014

북한은 화생방 무기체계운용의 경제성과 재래식 무기의 한계성을 인지하여 비대칭 전력을 활용한 대량살상무기에 대해 꾸준한 준비를 하고 있는 상황이다. 그러나 현재의 민방위 대피시설은 실질적으로 재래식 폭탄 및 미사일 등에 대한 위협만을 고려하고 있으며, 화생방 및 각종 테러 등의 재난 발생 시 적절하게 대응하지 못하여 민간의 피해를 가중시킬 수 있는 위험성을 내포하고 있다. 이에 본 연구는 우리의 실정과 재난 특성에 따라 적절히 대응할 수 있는 민방위대피시설의 계획 및 설계 방안을 도출하기 위해 화생방 재난을 중심으로 민방위 대피시설의 현황 및 설계기준을 파악하였으며 연구를 통해 얻은 결과 및 제안사항을 제시하고 있다.

• Korean Chemical Engineering Research
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• 제43권5호
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• pp.566-570
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• 2005

이중고리형 불포화탄화수소 화합물인 methylcyclopentadiene dimer(MCPD)의 수소화 및 이성화반응에 관한 연구를 행하였다. Exo 화합물은 2단계의 수소화반응 후에 이성화반응에 의해 제조되었다. 수소 1몰이 첨가되는 1차 수소화 반응은 $100^{\circ}C$이상의 반응온도에서는 다이머가 분해되어 모노머가 생성이 증가되었다. 1차 수소화 반응에 의하여 DHDMCPD[dihydrodi(methylcyclopentadiene)]가 생성된 후 2차 수소화반응을 진행하여 THDMCPD[tetrahydrodi (methylcyclopentadiene)]를 제조하였는데, 2차 반응온도조절에 의해 exo와 endo 비율이 변화되었다. 공정개선을 위하여 2단 가열반응기를 사용함으로 연속식 1, 2차 수소화 조건을 확립하였고 또한 endo THDMCPD로부터 exo 형태로 의 이성화반응에 할로겐화 알루미늄과 같은 할로겐화 금속촉매와 고체산 촉매를 사용하여 촉매의 활성을 비교하였다.