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.

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.

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

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.

Assessment of Influenza Vaccine Immunogenicity in Immunocompromized Host During 2009 Influenza Season: A Single Institution Experience

김동환,송봉섭,이준아,김동호,Kim, Dong Hwan,Song, Bong Sup,Lee, Jun Ah,Kim, Dong Ho The Korean Society of Pediatric Infectious Disease 2012 Pediatric Infection and Vaccine Vol.19 No.1

목 적 : 인플루엔자는 소아암 환자에게 이환율과 사망률이 높은 질환이나 소아암 환자에 대한 예방 접종률은 낮은 상태이다. 본 연구에서는 소아암 환자를 대상으로 인플루엔자 예방접종의 면역원성과 부작용에 대한 평가를 시행하였다. 방 법 : 2009년 10월부터 12월까지 원자력의학원에서 인플루엔자 예방접종(SK influenza IX vaccine$^{(R)}$)을 받은 25명의 소아암 환자를 대상으로 연구를 시행했다. 예방접종일과 접종 후 30일 뒤 2회에 걸쳐 채혈하였고 혈구응집억제 항체가를 측정하였다. 백신의 면역원성은 접종 전과 접종 후 30일의 혈구응집억제 항체가 1:40 이상인 피험자 비율, 접종 후 30일의 항체 양전율, 접종 전과 접종 후 30일 사이의 GMT 증가 배수로 평가하였다. 결 과 : 본 연구대상자 중에서 심각한 예방접종관련 부작용을 경험한 대상자는 없었다. 접종 후 혈구응집억제 항체가 1:40 이상을 보인 피험자의 비율은 H1N1 항원에 대해 68%, H3N2 항원에 대해 40%, B 항원에 대해 36%였다. 항체양전율은 H1N1 항원에 대해 12%, H3N2 항원에 대해 16%, B 항원에 대해 20%였다. GMT 증가 배수는 H1N1 항원에 대해 0.9, H3N2 항원에 대해 1.2, B 항원에 대해 1.8이었다. 결 론 : 본 연구의 대상자들은 인플루엔자 백신에 대해 제한적인 면역반응을 보였으나 일부 대상자들에게서 항체 양전이 나타났고 심각한 예방접종관련 부작용이 없었던 점을 고려할 때 소아암환자를 대상으로 매년 정기적인 인플루엔자 예방접종이 추천된다. Purpose : Although influenza is regarded as one of the major causes of morbidity and mortality in children with cancer, the actual vaccine coverage remains poor. We conducted evaluation of immunogenicity and safety of influenza vaccine in children with cancer. Methods : In this study, 25 children with cancer who received influenza vaccine (SK influenza IX vaccine$^{(R)}$) at the Korea Cancer Center Hospital between October and December 2009 were analyzed. Blood samples of patients were collected twice (at the beginning of this study and at 30th day after vaccination) and their antibody titers were measured using the hemagglutination-inhibition (HI) assay. Immunogenicity of the influenza vaccine was assessed by seroprotection rate on days 0 and 30, seroconversion rate on day 30, and mean fold increase (MFI) of geometric mean titer (GMT) of HI between days 0 and 30. Results : Any of the subjects in our study did not experienced serious adverse events after influenza vaccination. Seroprotection rates were 68% for H1N1, 40% for H3N2, and 36% for B. Seroconversion rates were 12% for H1N1, 16% for H3N2, and 20% for B. MFIs were 0.9 for H1N1, 1.2 for H3N2, and 1.8 for B. Conclusion : In the study, we found a limited protective immune response to influenza vaccine, among subjects with cancer. However, some subjects showed seroconversion, and there were no severe adverse events among all subjects, supporting the recommendation of annual influenza vaccination in children with cancer.

양돈산업의 새로운 도약을 시작하며

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

창간28주년기념사-양돈인 스스로가 만드는 양돈사업의 미래

김동환,Kim, Dong-Hwan 대한양돈협회 2007 養豚 Vol.29 No.7

자기 삶에 흥미를 가지고 사는 사람

김동환,Kim, Dong-Hwan 한국과학기술단체총연합회 2007 과학과 기술 Vol.40 No.3