이산화탄소 혼합 처리를 통한 이산화염소 훈증 처리 효과 제고 기술

김철영,권혁,김욱,김용균,Kim, Chulyoung,Kwon, Hyeok,Kim, Wook,Kim, Yonggyun 한국응용곤충학회 2017 한국응용곤충학회지 Vol.56 No.3

이산화염소 훈증 처리는 저곡해충에 대한 방제 가능성을 가지고 있다. 특히 체내로 독성 가스의 침투력을 높이기 위해 기문의 개방화를 유도하면 이 훈증 가스 처리 효과를 증가시킬 수 있다. 이 가설을 증명하기 위해 본 연구는 이산화염소 훈증 처리에 감수성을 보이는 화랑곡나방(Plodia interpunctella)을 대상으로 기문 개방 활동을 분석하였다. 화랑곡나방 유충의 기문은 모두 9쌍으로 앞가슴에 1쌍 그리고 복부에 8쌍을 각각 지니고 있다. 이들은 몸 내부에 가로 및 세로기관지와 연결된 구조를 지녔다. 기문 개방 유무는 염색액 침투 방법으로 판정하였으며 이를 토대로 분석한 결과 주변 온도 증가에 따라 기문 개방화는 약 60% 까지 증가하였다. 특히 이산화탄소에 노출되면 기문개방화는 약 95%까지 증가하였다. 반면에 이산화염소에 노출되면 화랑곡나방 유충의 기문은 대부분 닫혀 기문개방율이 약 25%로 줄었다. 이산화염소 처리에 이산화탄소를 추가한 결과 기문개방율은 이산화탄소 단독 처리만큼 크게 증가하였다. 이를 토대로 두 혼합 가스를 처리하여 살충효과를 분석한 결과 이산화염소 단독 처리에 비해 혼합처리가 현격하게 높은 살충력을 나타냈다. Fumigation using chlorine dioxide ($ClO_2$) has been regarded as a potential control technique against stored grain insect pests. The control efficacy can be enhanced with increase of opening rates of spiracles by facilitating the toxic gas delivery to internal body. To test this hypothesis, this study used the Indianmeal moth, Plodia interpunctella, which was known to be susceptible to $ClO_2$, and analyzed the opening rate of spiracles. A total of 9 pairs of spiracles were observed in P. interpunctella larvae, in which one pair was located on the prothorax and eight pairs were on the abdomen. Within the body, the spiracles were connected to longitudinal and transverse tracheal trunks. The open spiracles were determined by the dye-infiltration method. Based on this method, the opening rate of spiracles increased up to about 60% with increase of ambient temperatures. Furthermore, exposure to carbon dioxide stimulated the opening rate of spiracles up to about 95%. In contrast, exposure to $ClO_2$ prevented the spiracle opening and resulted in only 25% of spiracles in an opening state. The addition of carbon dioxide to $ClO_2$ treatment rescued the opening rate of spiracles as much as the carbon dioxide single treatment. Based on this modulatory activity of carbon dioxide against spiracles, the combined treatment of $ClO_2$ with carbon dioxide resulted in significant increase of its toxicity against P. interpunctella compared to a single $ClO_2$ treatment.

꽃노랑총채벌레와 대만총채벌레의 내한성과 월동처 비교 연구

김철영,최두열,팔구니칸,엠디따핌호사인흐리틱,홍주안,김용균,Chulyoung, Kim,Du-yeol, Choi,Falguni, Khan,Md Tafim Hossain, Hrithik,Jooan, Hong,Yonggyun, Kim 한국응용곤충학회 2022 한국응용곤충학회지 Vol.61 No.3

Two dominant thrips in hot pepper (Capsicum annuum) cultivating in greenhouses are Frankliniella occidentalis and F. intonsa in Korea. This study investigated their overwintering physiology. These two thrips were freeze-susceptible and suppressed the body freezing temperature by lowering supercooling point (SCP) down to -15~-27℃. However, these SCPs varied among species and developmental stages. SCPs of F. occidentalis were -25.7±0.5℃ for adults, -17.2±0.3℃ for pupae, and -15.0±0.4℃ for larvae. SCPs of F. intonsa were -24.0±1.0℃ for adults, -27.0±0.5℃ for pupae, -17.2±0.8℃ for larvae. Cold injuries of both species occurred at low temperature treatments above SCPs. Thrips mortality increased as the treatment temperature decreased and its exposure period increased. F. occidentalis exhibited higher cold tolerance than F. intonsa. In both species, adults were more cold-tolerant than larvae. Two thrips species exhibited a rapid cold hardening because a pre-exposure to 0℃ for 2 h significantly enhanced the cold tolerance to a lethal cold temperature treatment at -10℃ for 2 h. In addition, a sequential exposure of the thrips to decreasing temperatures made them to be acclimated to low temperatures. To investigate the overwintering sites of the two species, winter monitoring of the thrips was performed at the greenhouses. During winter season (November~February), adults of the two species were not captured in outside of the greenhouses. However, F. occidentalis adults were captured to the traps and observed in weeds within the greenhouses. F. occidentalis adults were also emerged from soil samples obtained from the greenhouses during the winter season. F. intonsa adults did not come out from the soil samples at November and December, but emerged from the soil samples obtained after January. To determine the adult emergence due to diapause development, two thrips species were reared under different photoperiods. Adult development occurred in all photoperiod treatments in F. occidentalis, but did not in F. intonsa especially under short periods. Tomato spotted wilt virus, which is transmitted by these two species, was detected in the weeds infested by the thrips during the winter season. These results suggest that F. occidentalis develops on weeds in the greenhouses while F. intonsa undergoes a diapause in the soil during winter.

소송에서의 적대 편향과 국선 전문가

김철영 ( Chulyoung Kim ),윤찬식 ( Chansik Yoon ) 연세대학교 경제연구소 2019 延世經濟硏究 Vol.26 No.1

적대 편향이란 소송 당사자들이 자신의 소송을 진행시키기 위한 전문가를 보유함으로써 발생하는 증언에서의 편향을 말한다. 우리는 그러한 적대 편향의 정도가 소송 과정에서 내생적으로 결정되는 간단한 분석틀을 제공한다. 본 모형을 통해, 우리는 국선 전문가를 사용하는 것이 적대 편향의 정도 및 평균적인 오류율에 미치는 영향을 분석하고, 흥미로운 트레이드오프 관계를 발견한다: 국선 전문가에게 자문을 구함으로써 판사는 재판에서의 실수의 수를 줄일 수는 있지만, 소송 당사자들은 그에 대한 반응으로서 편향된 전문가를 더욱 빈번하게 고용하기를 선택하며, 이것은 적대 편향의 정도를 증가시키고, 따라서 증거 왜곡을 더욱 빈번히 발생시킨다. Adversarial bias is witness bias that arises because litigants retain experts to advance their causes. We provide a simple framework where the level of adversarial bias is endogenously determined in a litigation process. Using this model, we study the effect of using a court-appointed expert on the level of adversarial bias and the average error rates, and find an interesting trade-off: although the judge can reduce the number of mistakes at trial by consulting a court-appointed expert, litigants choose to hire biased experts more frequently in response, which increases the level of adversarial bias, thereby inducing evidence distortion more often.

특허지표와 기업 성과의 인과관계에 대한 분석

임지연(Jiyoun Lim),김철영(Chulyoung Kim),구자철(Jachul Gu) 한국경영과학회 2011 經營 科學 Vol.28 No.2

As business environment has become more competitive, the R&D strategies of firms have been regarded more important. Patent has information about technology which affects a firm’s profit and it is considered as resources which have provided appropriate data for research of innovations and trends in technology. And patent indicators are known as qualitative representation of technology quality in an objective view. Also, they are available for the continuous and systematic analysis. However, most previous studies have focused on developing patent indicators to investigate patent value and characteristics. Furthermore they have limitations that most results is not significant that patent indicators have effect on firm performance-Tobin’s q, Intangible assets based on balance sheet, sales and etc. Thus, the purpose of this paper is to propose proper a factor to represent a firm performance and to analyze causal relationship between patent indicators and firm performance. Intangible assets based on market value are employed as one of most significant firm performance indicator. The results indicate that intangible assets are appropriate for analyzing causal relation between patent and a firm performance with 7 significant indicators among 10 patent indicators. Considering firm’s exogenous factors, regression analysis of each data for five years is performed. This result is similar to regression analysis of full data for all years.

제주지역 양봉장에 출몰하는 황말벌

정영석(Youngseok Jung),조종문(JongMoon Cho),김철영(Chulyoung Kim),김동순(Dong-Soon Kim),김윤주(Young-Ju Kim),임윤규(Yoon-Kyu Lim) 한국양봉학회 2014 韓國養蜂學會誌 Vol.29 No.4

PSC거더교에 적용한 매립·분리형 전단연결재의 콘크리트 바닥판 분리 효과 검증

박세현(Park, Sehyun),정대성(Jung, Daesung),김태형(Kim, Taehyeong),김철영(Kim, Chulyoung) 대한토목학회 2022 대한토목학회 학술대회 Vol.2022 No.10

강합성교량의 분리식 스터드 볼트 개발을 위한 Push-Out실험 비교 연구

박세현(Park, Sehyun),정대성(Jung, Daesung),김태형(Kim, Taehyeong),김철영(Kim, Chulyoung) 대한토목학회 2021 대한토목학회 학술대회 Vol.2021 No.10

내산화 코팅용 인산염계 유리의 제조 및 특성평가

송현수,최연호,윤존도,김철영 경남대학교 신소재연구소 2003 신소재연구 Vol.15 No.2

탄소/탄소 복합체의 내산화성 코팅용 인산염계 유리를 제조하였고 특성평가를 하였다. 알루미나 함량이 10, 17, 25, 28 몰%를 함유라는 인산염계 코팅막을 제조하여 기존의 인산염계 코팅막과 비교하였다. 제조된 유리에 대한 열팽창을 측정, 용해도 시험, 접합성 시험 등 특성평가를 실시하였다. 열팽창률은 17 몰%의 인산알루미늄 유리가 5.7×10^(-6)/K의 값을 갖는 것으로 나타났다. 생성된 코팅막은 모두 비정질이었으며 복합체에 대한 접합성은 좋지 않았으나 수분에 의한 환경의 영향은 없는 것으로 나타났다. The phosphate glass coating materials for oxidation resistance of carbon-carbon composite at high temperature were prepared. The coating materials consisted of phosphate and alumina with 10, 17, 25, 28 ㏖%. They were evaluated to compare the oxidation resistance with conventional phosphate coatings. Thermal expansion coefficient value of 5.7×10^(-6)/K was obtained in specimen with 25 ㏖% of Al₂0₃. Phosphate coating material prepared had amorphous phase. It did not have a good adhesion to the carbon-carbon composite substrate, but was stable under the water environment.