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김경주(Kyung Joo Kim),장강원(Gang-Won Jang),김윤영(Yoon Young Kim) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.6
It is known that the standard Timoshenko beam theory is not capable of correctly predicting static and dynamic behavior of a beam when it is thin-walled. It has been shown that when it is straight or circular, a recently-developed higher-order beam theory considering warping and distortion yields correct solutions. So, one can naturally consider the use of the theory for the analysis of a thin-walled arbitrarily-curved beam. Though a set of straight beam elements is expected to model the curved beam correctly, the straightforward element interface matching as used in the Timoshenko theory turns out to yield erroneous results. This is due to the difficulties in matching warping and distortion at the element interface. After reviewing the higher-order beam theory, the technical issues related to the application of the theory for the analysis of thin-walled curved beams are presented. Though the issues remain yet unsolved, a few ideas to overcome the difficulties are discussed.
폭발 반응성 조절이 가능한 나노에너제틱 물질의 광학적 점화 및 수중폭발에의 응용
김지훈(Ji Hoon Kim),김상범(Sang Beom Kim),조명훈(Myung Hoon Jo),정훈(Hoon Jung),안지영(Ji Young Ahn),김경주(Kyung Joo Kim),김수형(Soo Hyung Kim) 한국추진공학회 2015 한국추진공학회 학술대회논문집 Vol.2015 No.11
나노에너제틱 물질(Nanoenergetic Materials)의 수중응용분야는 더욱 간편하고 신뢰성 있는 점화방식의 개발로 확장될 수 있다. 그러나, 실제로 나노에너제틱 물질의 수중점화는 매우 어려운데 이는 수중점화시 주변의 물분자로 인해 점화 자체가 어렵고 점화가 이루어진다고 하더라도 수분에 의한 급격한 냉각 효과로 폭발로 이어지기 어렵기 때문이다. 본 연구에서는 플래시 점화가 가능한 수중폭발용 나노에너제틱 물질을 개발하였다. 나노에너제틱 물질에 성게형 탄소나노튜브(Sea Urchin-like Carbon Nanotubes, SUCNTs)를 첨가하여 플래시에 의한 점화를 유도하였고, 성게형 탄소나노튜브/나노에너제틱 물질 복합체 펠렛에 니트로셀룰로오스(Nitrocellulose, NC) 코팅을 통해 수중폭발(Underwater Explosion)에 성공하였다. The underwater application of nanoenergetic materias (nEMs) could be extended by developing more convenient and reliable ignition methods, However, the undewater ignition of nEMs is a significant challenge because water perturbs the reactants prior to ignition and also quenches the subsequent combustion reaction of nEMs upon ignition. In this study, we developed flash-ignitable nEMs for underwater explosion. This was achieved by adding sea urchin-like carbon nanotubes (SUCNTs) as the optical igniter into an nEM matrix, composed of Al/CuO nanoparticles. Also, underwater flash ignition was achieved by coating water repellan nitrocellulose (NC) film on the surface of SUCNTs/nEM composite pellets.
김종부(Kim Jong Boo),신명국(Shen Ming Guo),성낙환(Sung Nak Whan),최문정(Choi Moon Jeong),김경주(Kim Kyung Joo),이동석(Rhee Dong Seok) 강원대학교 산업기술연구소 2000 産業技術硏究 Vol.20 No.1
This experiment was done to investigate the leaching and adsorption properties of heavy metals on porphyry. The comparison with respect to the leachability of heavy metals from porphyry between the Korea Standard Leaching Test (KSLT) and the Toxicity Characteristic Leaching Procedure (TCLP) was carried out. The fractional composition of leachate and the total concentration of heavy metal of porphyry were studied through Sequential Extraction Procedure (SEP) and EPA Method 3050. Adsorption experiment of porphyry has pointed out that the optimum dosage of porphyry for 50ppm Pb was over 10g/L, the effective particle size for absorption was below 200 mesh and the optimum pH was about 7. From the Freundlich’ adsorption equation, l/n was 1.0722, and k was 0.0041. After adsorption, the fractional composition of Pb was changed. The exchangeable, carbonate, reducible fractions were increased, and the organic fraction was not changed, and the residual fraction was decreased.
강원도 고랭지 Chlorpyrifos 포장저항성 배추좀나방(Plutella xylostella L.)의 저항성 특성
조준모(Jun-Mo Cho),김경주(Kyung-Joo Kim),김성수(Seong-Soo Kim),박홍열(Hong-Ryeol Park),임춘근(Chun-Keun Lim),허장현(Jang-Hyun Hur) 한국농약과학회 2006 농약과학회지 Vol.10 No.1
A field-resistant strain of the diamondback-moth(Plutella xylostella L.), collected from Chinese cabbage alpine farmland at Gangwon-do, Korea, was used for determination of the characteristics of resistance to chlorpyrifos using the activities of esterases and glutathione-S-transferase(GST), protein sequestration and AChE insenstivity. Although the activities of esterases extracted from resistant strain and susceptible strain were not significantly different, isozyme bands shown on the electrophoresis were different. GST activity from field resistant strain was 1.5-fold higher than that of susceptible. No differences were shown between resistant and susceptible ones in protein sequestration. The insensitivities of AChE to chlorpyrifos, however, extracted from susceptible strain was 460-fold higher than those of resistant. These results indicated that the insensitivity of AChE is the major factor for developing the resistance and activities of GST might be a minor factor.