귤응애에 대한 팔라시스이리응애의 포식특성

김동환,김상수,김광식,현재욱,Kim, Dong-Hwan,Kim, Sang-Soo,Kim, Kwang-Sik,Hyun, Jae-Wook 한국응용곤충학회 2006 한국응용곤충학회지 Vol.45 No.2

감귤의 중요 해충인 귤응애의 생물적 방제를 위한 목적으로 귤응애에 대한 팔라시스이리응애의 포식특성을 조사하였다. 25$^{\circ}C$ 항온조건에서 귤응애의 알, 유충, 전약충, 후약충에 대한 팔라시스이리응애 암성충의 1일간 포식량은 각각 20.1, 26.1, 18.2, 7.4개체로 유충에 대한 포식량이 가장 많았다. 온도에 따른 포식량 조사결과, 온도가 높을수록 포식량이 증가하였으며, 이 때 팔라시스이리응애가 귤응애 알을 포식한 후의 출산능력(팔라시스이리응애 출산 알수/포식된 귤응애 알수), 즉 전환율은 10$^{\circ}C$를 제외하고는 0.09로 일정하였다. 잎 절편의 지름을 각각 20, 40, 60 mm로 하여 귤응애 알을 먹이로 공급했을 때 1일간 포식량은 각각 21.1, 17.3, 16.7개로 잎 면적이 증가할수록 포식량은 감소하였다. 또한 팔라시스이리응애는 귤응애 알, 유충, 약충을 먹이로 공급하였을 때 먹이밀도가 증가할수록 포식량은 점차 증가하였으나 그 증가율은 점차 감소하는 Holling의 기능반응 H형의 특성을 보였다. 이상의 시험결과 팔라시스이리응애는 귤응애의 생물적 방제 인자로서 가치가 있는 것으로 판단된다. Predation of Neoseiulus fallacis was observed for biological control of Panonychus citri that is one of the major insect pests on citrus. The daily predation of development stages of P. citri by an adult female of N. fallacis were 20.1 eggs, 26.1 larvae, 18.2 protonymphs, and 7.4 deutonymphs at 25$^{\circ}C$, The daily predation of P. citri eggs by N, fallacis was observed under different temperatures. The predation was increased as the temperature rise. At this time, ratio of eggs production of l! fallacis after predation of P. citri eggs (number of eggs N. fallacis/number of eggs P. citri consumed by N. fallacis) was 0.09. The daily predation of P. citri eggs by N, fallacis was 21.1, 17.3, and 16.7 on the different arenas (diameter: 20, 40, and 60 mm), respectively. The predation was decreased as the arena of the leaf increase. The functional response of M fallacis to P. citri showed Holling's Type II response: the consumption of prey by N. fallacis increased as the density of prey increase but increasing rate was gradually reduced. As the result, it seemed that N. fallacis can be use for biological control of P. citri.

열적, 화학적 강화에 의해 잔류응력이 형성된 유약층을 가진 도자기의 기계적 물성

김동환,맹지헌,한윤수,김형태,최성철,김형준,Kim, Dong-Hwan,Maeng, Jee-Hun,Han, Yoon Soo,Kim, Hyung-Tae,Choi, Sung-Churl,Kim, Hyeong-Jun 한국세라믹학회 2014 한국세라믹학회지 Vol.51 No.5

In this study, we measured the thermally and chemically induced residual stresses on glaze using the photoelastic method. Porcelain with thermally induced residual stress showed compressive stress of 49 MPa for thermal expansion mismatch and a locally fluctuated stress field over the glaze layer due to compensation of compressive stresses around pores. In the case of chemically strengthened porcelain, the compressive stress on the glaze was 151 MPa which was around 3 times higher than the stress on thermally strengthened glaze. The trend of fracture strength of thermally and chemically strengthened porcelains was coincident with that of the residual stress of porcelains.

Squeezing in a Josephson-junction-based Parametric Amplifier

김동환,김덕영,김재일,이수용,Kim, Dong-Hwan,Kim, Deok-Yeong,Kim, Jae-Il,Lee, Su-Yong 한국초전도저온학회 2022 초전도와 저온공학 Vol.24 No.1

SnO-P₂O₅계 유리에서 P₂O₅를 B₂O₃로 치환시 구조와 물성에 미치는 영향

김동환,황차원,김남진,임상혁,구동건,김태희,차재민,류봉기,Kim, Dong-Hwan,Hwang, Cha-Won,Kim, Nam-Jin,Im, Sang-Hyeok,Gwoo, Dong-Gun,Kim, Tae-Hee,Cha, Jae-Min,Ryu, Bong-Ki 한국세라믹학회 2011 한국세라믹학회지 Vol.48 No.1

The investigation is directed to lead free (Pb-free) frits that can be used for organic light emitting diode, plasma display screen devices and other sealing materials. $P_2O_5$-SnO system glasses have been prepared for Pb-free low temperature glass frit. Structure and properties of the glasses with the composition SnO-$xB_2O_3-(60-x)P_2O_5$ (x=0, 5, 10, 15, 20, 25, 30, 35, 40 mol%) were characterized by infrared spectra (IR), X-ray diffraction(XRD), Density, Molar volume, Thermo mechanical analysis(TMA) and weight loss after immersion test. Glass transition temperature($T_g$), dilatometric softening temperature($T_d$) and chemical durability increased, and coefficient of thermal expansion($\alpha$) decrease with the substitution of $B_2O_3$ for $P_2O_5$ in the range of 0~25 mol%.

수직원통형 빙축열조내 외향용융과정시 열전달특성에 관한 연구 -작동유체의 유동방향 및 축열조 형상비에 따른 열성능 비교-

김동환,김동춘,김일경,김영기,임장순,Kim, D.H.,Kim, D.C.,Kim, I.G.,Kim, Y.K.,Yim, C.S. 대한설비공학회 1997 설비공학 논문집 Vol.9 No.2

During the day time in summer, peak of air conditing load, and electric power management system lies under overloaded condition. The reason is the enlarged peak load value of electric power caused by increased air-cooling load in summer. To prevent load concentration during day time and overloaded condition of power management system, some energy storage methods are suggested. One of these methods is ice storage system. Water has some good properties as P.C.M.(Phase Chang Material) : Its melting point is the range of required operation temperature. It has large specific latent heat and is chemically stable compared to other organic or inorganic substances. It is cheap and easy to treat. This study represents experimental results of heat transfer characteristics of P.C.M. under the outward melting process in a vertical cylinder. We experimented with twelve combinations of conditions, i.e., three different inlet temperatures($7^{\circ}C,\;4^{\circ}C\;and\;1^{\circ}C$), two working fluid directions(upward and downward), and two aspect ratios, H/R(4 and 2). At the inlet temperature of $7^{\circ}C$ and $4^{\circ}C$, there was temperature stagnation region where the temperature of P.C.M. remains constant at $4^{\circ}C$ regardless of aspect ratio and direction of working fluid. This temperature stagnation occurs as the water, at its maximum density, flows down to the lower region. The phase change interface formed bell-shaped curve as the melting process continued. With a new set of conditions(4H/R, inlet temperature $4^{\circ}C$ and $1^{\circ}C$, downward/upwerd inlet direction), the movement of phase change interface was faster when the working flued inlet direction was downward. With the same set of conditions, melting rate and total melting energy were larger when the working fluid inlet direction was downward. The results were reversed when the other sets of conditions were applied.

팔라시스이리응애에 대한 농약의 독성

김동환,김상수,김광식,현재욱,Kim, Dong-Hwan,Kim, Sang-Soo,Kim, Kwang-Sik,Hyun, Jae-Wook 한국응용곤충학회 2006 한국응용곤충학회지 Vol.45 No.2

감귤 병해충 방제용으로 사용되고 있는 37종의 약제에 대한 팔라시스이리응애의 감수성을 조사한 결과, difenoconazole, imibenconazole, azoxystrobin, dithianon, fluazinam, procymidon, streptomycin, tribasic copper sulfate 등의 살균제 8종과 dichlovos, imidacloprid, thiamethoxam 등의 살충제 3종, 그리고 milbemectin, tetradifon, dicofol, spirodiclofen 등의 살비제 4종은 팔라시스이리응애 알의 부화율에 대한 영향이 적었으며, propineb, difenoconazole, imibenconazole, azoxystrobin, dithianon procymidon 등의 살균제 6종과 bifenazate, tetradifon, spirodiclofen 등의 살비제 3종은 성충에 대한 독성이 낮았다. 농약이 살포된 점박이응애 알을 먹이로 공급하여 성충에 대한 이차독성을 검정한 결과, 살균제 2종(fluazinam, streptomycin)과 살비제 3종(machine oil, cyhexatin, halfenprox)이 독성이 낮은 것으로 나타났다. The toxicities of 37 commercial pesticides for citrus pests were evaluated to H, fallacis. Eight fungicides (difenoconazole, imibenconazole, azoxystrobin, dithianon, fluazinam, procymidon, streptomycin, tribasic copper sulfate), three insecticides (dichlovos, imidacloprid, thiamethoxam) and four acaricides (milbemectin, tetradifon, dicofol, spirodiclofen) had lower effect to the hatchability of eggs N. fallacis. Six fungicides (propineb, difenoconazole, imibenconazole, azoxystrobin, dithianon, procymidon) and three acaricides (bifenazate, tetradifon, spirodiclofen) showed lower contact toxicity to adult N. fallacis. The secondary toxicity of 26 pesticides to N. fallacis adult were evaluated. Two fungicides (fluazinam, streptomycin) and 3 acaricides (machine oil, cyhexatin, halfenprox) showed low toxicity when the prey (eggs of spider mite) was treated with pesticides.

양돈산업의 새로운 도약을 시작하며

김동환,Kim, Dong-Hwan 대한양돈협회 2007 養豚 Vol.29 No.4

DVD용 650nm InGaP/InGaAIP 레이저 다이오드

김동환,장준호,유태경,Kim, Dong-Hwan,Jang, Jun-Ho,Yu, Tae-Gyeong 대한전자공학회 1998 전자공학회지 Vol.25 No.6

건설기계용 Urea-SCR 시스템의 촉매전단에서 암모니아 균질도 해석 및 DeNOx 성능에 관한 연구

김동환,박준규,강정호,문성준,박성욱,Kim, Donghwan,Park, Junkyu,Kang, Joung-ho,Moon, Seonjoon,Park, Sungwook 한국분무공학회 2019 한국액체미립화학회지 Vol.24 No.2

In this study, the spray atomization characteristics of urea injector used in SCR system for construction machinery was analyzed, and the uniformity index at the front of mixer and NOx conversion efficiency were evaluated through numerical analysis. Spray visualization and droplet size/velocity measurement were performed and the measured results were used to verify the spray analysis model to calculate the uniformity index in the exhaust gas after-treatment system. For the flow analysis, STAR-CCM, a three-dimensional CFD, was used and the uniformity index of the SCR system at the front of the mixer was calculated using the droplet dissociation model and the wall collision model. Finally, the DeNOx performance for the average condition of the NRTC driving mode was calculated to understand the NOx conversion efficiency reflecting the exhaust gas temperature. The simulation results show that the uniformity index at the front of mixer was calculated as 0.862 and DeNOx efficiency was 75.9%.

국방분야에서 인포그래픽 적용사례 연구 - 영(英) 가디언지 아프가니스탄전 데이터저널리즘을 중심으로

김동환,Kim, Dong Hwan 한국공간정보학회 2014 한국공간정보학회지 Vol.22 No.5

최근 창조경제 시대를 맞이하여 급부상하는 단어가 바로 빅데이터이다. 이에 따라 공간정보 관련 기관들도 공간빅데이터체계를 구축하기 위해 노력하고 있다. 공간빅데이터는 공간정보와 빅데이터가 결합한 형태로써 사용자들이 효율적으로 이해하기 위해서 데이터 시각화 기술이 필수적이다. 최근 데이터 시각화 기술 중에 떠오르는 분야는 바로 인포그래픽이다. 국내에서는 조선닷컴이 2010년 8월부터 인포그래픽 뉴스를 서비스하고 있다. 대한민국 정부도 2013년 정부 부처 업무보고를 시작으로 인포그래픽을 선도적으로 활용하고 있다. 외국 인포그래픽 업체 Visual.ly의 경우 이집트 의원선거 결과를 인터랙티브 인포그래픽을 이용하여 직관적이고 효과적으로 데이터를 시각화했다. 국방분야 인포그래픽 가운데 영국 가디언지가 2010년에 발표한 아프가니스탄 전쟁 관련 인포그래픽을 완성도가 높은 데이터 시각화의 형태로 볼 수 있다. 가디언지가 제작한 인포그래픽을 연구한 결과 국방분야 인포그래픽이 갖추어야 할 5가지 조건을 도출하였다. 첫째, 원천 데이터는 시공간적으로 정확성을 갖추고 있어야 한다. 둘째, 인포그래픽의 이미지는 정보를 압축하여 담고 있어야 한다. 셋째, 인포그래픽은 지휘관을 위해 가공된 정보를 제공해야 한다. 넷째, 질 높은 인포그래픽 생산을 위해 공유과 개방, 소통이 필수적이다. 다섯째, 과거의 자료를 토대로 정보를 생산하고 미래의 사건을 예측할 수 있는 분석적 도구로써의 인포그래픽이 되어야 한다. 인포그래픽은 데이터를 직역하여 보여주는 것이 아닌 사용자의 판단과 결심을 돕는 분석적 도구로써 사용되어야 할 것이다. Recently, Big Data is a buzzword in the creative economy generation. The organizations related to spatial information society focus on building the spatial big data systems. As spatial big data is a combination of spatial information and big data, the data visualization is essential in order to utilize them efficiently. One of the great methodologies for data visualization is infographics. Nationally, Chousn.com initiated the infographics news in 2010. Korean Administration Branches also recognized the importance of infographic and they adopted infographics for their briefings from 2013. Internationally, Visual.ly is leading company in the infographics market and they produced noticeable interactive infographics for Egypt Parliamentary Elections results. In the defense part, Guardian's datajournalism of Afghanistan war log was a good example of utilizing infographics. Throughout the research, five requirements are extracted. First source data should have precision and accuracy in terms of time and space manner. Second, infographics images have a compressibility. Third, the infographics is properly processed for military commanders. Fourth, sharing, openness and communication are essential for high quality infographic. Lastly, infographics should be an analytic tool for predicting future event based on the past data. Infographics is not a direct representation of data but an analytic tool for helping user's choice and decision in critical moments.