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가정용 살충제 중 모기 살충제 제품의 살충성분 함량 및 휘산율 조사
이민진(Minjin Lee),이채홍(Chaehong Lee),이지은(Jieun Lee),이정현(Junghyun Lee),탁준형(Junhyung Tak) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
국내에 판매되는 모기 살충제 제품의 제형은 에어로솔, 액체전자모기향, 매트전자모기향, 모기향, 걸이형, 스티커/팔찌 형태로 확인되었다. 액체 및 매트 전자모기향은 즉효성 제품인 에어로솔 제형과는 달리 일정 시간(기간) 동안 꾸준히 효력을 발휘하는 제형이다. 그러나 현재까지 실제 제품이 주장하는 기간 동안 지속적으로 효력이 발휘되는지에 대한 효능시험의 확인이 이루어지지 않고 있다. 향후 활용을 위한 레퍼런스 구축의 목적으로 제품의 휘산시간(일자)에 따른 살충성분 방출량 곡선 정보 확보가 필요한 실정이다. 또한 살충제 휘산율 평가를 통해 제품 표시 및 광고 내용에 대해 실험을 통한 정량적 확인 및 관리가 가능할 것으로 보인다. 본 연구에서는 휘산시간(일자) 별 살충제 주성분 잔량 분석을 시행하여 살충 효능 유지 정도를 분석적 관점에서 확인하였다. 액체 및 매트 전자모기향에 사용되는 살충성분 d,d-시스/트란스프랄레트린, d-시스/트란스알레트린, 메토플루트린에 대해 휘산 전 제품 자체의 살충성분 함량 조사와 일정한 시간으로 ( 0 ~ 21 )시간 또는 ( 0 ~ 45 )일 휘산 시켰을 경우 제품에 잔류하고 있는 살충성분 잔류량을 조사하였다. 각 제품에 대한 주성분 함량 분석 및 휘산성 평가를 통해 향후 각 살생물제품 개발 업체 및 제조 업체의 원료 및 제품 품질관리 및 신규 제품 개발을 위한 기초자료로 활용이 가능할 것으로 사료된다.
이민진(Minjin Lee),이채홍(Chaehong Lee),이지은(Jieun Lee),이정현(Junghyun Lee),탁준형(Junhyung Tak) 환경독성보건학회 2021 한국독성학회 심포지움 및 학술발표회 Vol.2021 No.5
오래전부터 좀벌레 방제를 위해 나프탈렌을 사용해왔으나, 나프탈렌의 강한 향취로 인해 사용에 부담이 크며, 이를 대체하는 목적으로 무향, 무취의 엠펜트린을 주성분으로 한 좀벌레 방제제 사용이 대세가 되었다. 좀벌레는 질병을 매개하지는 않으나, 단순히 의류의 손상을 가하는 등의 경제적 피해만을 주는 해충으로 분류되어 좀벌레 방제제는 지금까지 공산품으로 유통되어 왔으며, 이들 제품에 대한 함량 기준 및 효능 기준이 전무한 상황이었다. 그러나 「생화화학제품 및 살생물제의 안전관리에 관한 법률」(이하 ‘화학제품안전법’)이 2019년 1월 1일 시행되면서 살생물제로 편입되어 해당 효능물질 및 제품에 대한 인허가 기준을 정립할 필요성이 발생하게 되었다. 현재 방충 효능을 나타낼 수 있는 엠펜트린의 기준이 없어 정확한 사용량 확인이 필요한 실정이다. 본 연구에서는 좀벌레 방제제로 사용되는 엠펜트린의 독성자료 개발을 위한 기초자료로 제품 중 엠펜트린의 함유량 실태조사와 최대 6개월까지 휘산 후 제품 중 엠펜트린의 잔류량을 확인하고자 한다. 국내에서 판매중인 좀벌레 방제제 29개 제품에 대해 엠펜트린 분석결과 20개 제품에서 엠펜트린이 검출되었으며, 검출된 제품에 대해 제품의 용도에 맞게 옷장과 서랍장에서 1개월, 2개월, 3개월, 4개월, 6개월 휘산시킨 후 잔류하는 엠펜트린 함량시험을 진행하여 휘산율을 확인하였다.
Effects of hot-melt extruded nano-copper on the Cu bioavailability and growth of broiler chickens
( Junhyung Lee ),( Abdolreza Hosseindoust ),( Minju Kim ),( Kwangyeol Kim ),( Taegyun Kim ),( Joseph Moturi ),( Byungjo Chae ) 한국축산학회(구 한국동물자원과학회) 2021 한국축산학회지 Vol.63 No.2
This study was aimed to investigate the Cu bioavailability, growth response, digestibility of nutrients, and blood metabolites of broiler chicks fed CuSO<sub>4</sub> in nano or common forms. A total of 720 broiler chickens were distributed between eight treatments according to a completely randomized design. There were 8 treatments and 6 replicates in each treatment with 15 birds/replicate. The treatments were divided into common copper sulfate at the doses of 16 ppm, 40 ppm, 80 ppm, and 120 ppm (INO) and hot-melt extruded copper sulfate at the doses of 16 ppm, 40 ppm, 80 ppm, and 120 ppm (HME-Cu). The experiment was operated for 35 days in 2 phases (phase 1, d 0 to 14; and phase 2, d 15 to 35). No significant differences were shown in growth performance, feed intake, FCR, and nutrient digestibility among the treatments. The concentration of Cu in the serum was increased in the HME-Cu broilers compared with the INO broilers at phase 2. A linear increase was observed in the concentration of Cu in the liver in broilers fed INO diets, however, no significant differences were observed by the supplementation of HME-Cu levels. The linear increase was detected in the content of Cu in excreta in the INO and HME-Cu treatments by increasing the dietary Cu content. The HME-Cu treatments showed a lower Cu concentration in the excreta compared with the INO treatments. The higher bioavailability of Cu in HME form can decrease the recommended dose of Cu in broiler diets.
Junhyung Bae,Seonghun Lee,Dong-Hwan Shin,Jaeseung Hong,Jaeseong Lee,Jong-Hae Kim 대한전기학회 2017 Journal of Electrical Engineering & Technology Vol.12 No.3
In this paper, we represent a nonlinear identification of electronic brake pedal behavior in the brake-by-wire (BBW) system based on hybrid group method of data handling (GMDH) and genetic algorithm (GA). A GMDH is a kind of multi-layer network with a structure that is determined through training and which can express nonlinear dynamics as a mathematical model. The GA is used in the GMDH, enabling each neuron to search for its optimal set of connections with the preceding layer. The results obtained with this hybrid approach were compared with different nonlinear system identification methods. The experimental results showed that the hybrid approach performs better than the other methods in terms of root mean square error (RMSE) and correlation coefficients. The hybrid GMDH/GA approach was effective for modeling and predicting the brake pedal system under random braking conditions.
Reliability and Validity of the Korean Version of the Brief Resilience Scale
Junhyung Kim,Hyun-Ghang Jeong,Moon‑Soo Lee,Seung-Hoon Lee,Sang-Won Jeon,Changsu Han 대한정신약물학회 2023 CLINICAL PSYCHOPHARMACOLOGY AND NEUROSCIENCE Vol.21 No.4
Objective: To translate the Brief Resilience Scale into Korean and evaluate its reliability and validity. Methods: To investigate the factor structure of the Brief Resilience Scale, we examined a two-factor model comprising positively and negatively worded items. Congruent and divergent validity of the Brief Resilience Scale were investigated using correlation analysis between the Brief Resilience Scale and resilience, depression, and perceived stress. By conducting an analysis of variance among groups classified by suicidality (no suicidality, only suicidal ideation, and suicidal ideation or suicidal plan groups), we evaluated how well the Brief Resilience Scale could detect people with a high risk of suicide. Results: Confirmatory factor analysis results supported the construct validity of the Brief Resilience Scale using a two-factor model. Cronbach’s alpha (0.91) and McDonald’s omega (0.91) scores indicated high internal consistency. Correlation analysis showed that the Brief Resilience Scale scores were strongly associated with a questionnaire evaluating resilience, depression, and perceived stress. Analysis of variance and post-hoc tests showed that he Brief Resilience Scale scores were highest in the no suicidality group (p < 0.001). Conclusion: The Korean version of the Brief Resilience Scale is a valid and reliable instrument for evaluating resilience as the capacity to recover from adversity and endure obstacles or stress. This study also provides important evidence regarding the sensitivity of the Brief Resilience Scale to suicidal risk.
( Junhyung Lee ),( Abdolreza Hosseindoust ),( Minju Kim ),( Kwangyeol Kim ),( Yohan Choi ),( Joseph Moturi ),( Changhyun Song ),( Songyi Lee ),( Hyunjong Cho ),( Byungjo Chae ) 한국축산학회 2019 한국축산학회지 Vol.61 No.4
This study was conducted to investigate the effects of hot melt extrusion (HME) nano-iron as an alternative for the common ferrous sulfate on iron (Fe) bioavailability, growth performance, nutrient digestibility, intestinal morphology, and intestinal microbiota of weanling pigs. A total of 200 piglets (Landrace × Yorkshire × Duroc) were randomly allotted to seven treatments on the basis of initial body weight (BW) and sex. Treatments were the INO100 (100 ppm Fe as FeSO<sub>4</sub>), HME-Fe levels (50, 75, and 100 ppm nano-Fe as FeSO<sub>4</sub>). ORG100 (100 ppm Fe as iron methionine). In phase 1, the HME50 pigs showed the lowest Fe content in feed and feces. Plasma Fe concentration was increased in HME100 and ORG100 pigs. In phase 2, there were significantly lower concentration of Fe in feed and feces of HME50 pigs (p < 0.01). A lower Fe concentration in the plasma and liver were observed in HME50 pigs compared with HME100 pigs. Concentration of red blood cell (RBC) was the lowest (p < 0.01) for HME50 pigs. During phase 2, the HME100, HME75, and ORG100 pigs showed a higher RBC and hemoglobin values compared with HME50 pigs. Digestibility of gross energy (GE) and crude protein (CP) were significantly higher in HME100 pigs compared with HME50 pigs. There was an increased (p < 0.01) villus height in the duodenum and jejunum of HME100 pigs compared with HME50 pigs. It is concluded that dietary Fe does not improve growth performance of weanling pigs; however, increasing the dietary iron concentration in weanling piglets increased the RBC and hemoglobin. In addition, the potential ability of HME to be used at a lower level (HME75) was observed.
Lee, Junhyung,Kwak, Seung-Yeop The American Chemical Society 2017 CRYSTAL GROWTH AND DESIGN Vol.17 No.9
<P>While preparation of metal oxide from metal organic frameworks (MOFs) has been widely studied, crystal growth via thermal decomposition of MOFs in a confined space is rarely investigated. We demonstrate a confinement effect on the crystal growth via pyrolysis of MOFs at high temperature. Iron containing MOF (Fe-MIL-88A) was calcined inside a SiO2. The crystalline phase, particle size, morphology, and magnetic properties of the synthesized iron oxide were characterized; alpha-Fe2O3 tubular structures that consisted of nanoparticles (around 10 nm) were observed. Studies of the magnetic properties show enhanced magnetization with superparamagnetic behavior. These results indicate that space confinement during the thermal treatment in air at high temperature allows the synthesis of small nanoparticles and the preservation of initial morphology of MOF precursors, which cannot be obtained via heating of MOFs without shell under identical conditions.</P>
송준형(Junhyung Song),성동현(Donghyun Sung),이동현(Donghyun Lee),이운성(Woon-Sung Lee) 한국자동차공학회 2008 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-
A lane departure warning system uses vision sensors to monitor vehicle position within its travel lane. and warns a driver if the vehicle drifts out of a lane unintentionally as a result of driver drowsiness. distraction or inattention. In this study, we used a driving simulator to evaluate effectiveness of warning methods in the lane departure warning system. We tested three warning methods including visual, audible and combined warning methods. A waring device has been installed on the dashboard next to the steering wheel. Based on time to lane crossing, warning is given twice. First and second warning is given when the time to lane crossing becomes 1.5 and 1 second, respectively. We analyzed frequency of second warning, return time after first warning, maxim departure distance and resultant overall effectiveness rate. The results show that combination of visual and audible warning is most effective. Analysis of variance shows that difference in effectiveness of warning methods is statistically meaningful.