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Sung Hum Yeon,Jae Hyun Oh,In Hong Jeong,Young Joon Ahn 한국응용곤충학회 2011 한국응용곤충학회 학술대회논문집 Vol.2011 No.05
The emulsion and micro-encapsuled formulation from three essential oils, cassia, thyme white and lemon grass were tested for their insecticidal activities against Lycoriella ingenua (Dufour) adults at 0.3% concentration. As a result, the micro-encapsules than emulsion formulation was confirmed to show greater activity. Based on this result, insecticidal activities at several levels of concentration were examined, resulting in more than 80% insecticidal activity after 30 minutes at 0.6% level of cassia formulation. And also, insecticidal activity of three oil-based micro-encapsuled formulations lasted for up to 12 hours at 0.9% concentration. The main ingredients derived from three essential oils were evaluated on the insecticidal activity against Lycoriella ingenua. As a result, in case of thymol from thyme white, it showed more than 80% mortality after over 30 minutes at 0.25%, and in cinnamic aldehyde and citral, exhibited 88% and 82% mortality after 30 minutes at the 0.5% level, respectively. These three compounds were examined for whether the insecticidal activity was maintained depending on being over time. In case of thymol, it maintained good insecticidal activity against Lycoriella ingenua at 0.5% level until 120 hours, while cinnamic aldehyde and citral showed lower activity after 12 hours.
Sung Hum Yeon,Jae Hyun Oh,Soon Il Kim,Young Joon Ahn 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
In the previous study, the plant essential oils such as clove bud , thyme white and garlic oils gave potent toxicity with the range of 1.5 to 4.5×10-3 ul cm-3 of LC50 values against Bemisia tabaci. Based on the bio-assay results, three plant essential oils(clove bud, thyme white and garlic) were applied to 30% emulsion type. The 100, 200 and 400 fold dilution of these emulsions was showed mild toxicity under port scale treatment against Q biotype. At each fold dilution, clove bud showed 44, 26 and 14%, and thyme white produced 44, 39 and 27%, respectively. Of garlic emulsion, its toxicity was evaluated with 27, 26 and 11%, respectively. But, in case of clove bud and thyme white mixture, their toxicity was more good under the mixture than under the single treatment. Mixture with clove bud 200 fold dilution adding to thyme white 200 fold dilution showed potent activity with 86% mortality. And also 200 adding to 400, and 400 to 400 exhibited 61%, 76%, respectively. These essential oil mixtures showed similar strong toxicity against B biotype under port scale test. In particular, the mixture with clove bud 200 fold dilution adding to thyme white 200 fold dilution showed the highest synergistic effect. Toxicity to plants, except the 100 fold dilution of these emulsions was not observed.
Hee Sung Youn,Soon-IL Kim,Sung Hum Yeon,Jae Won Kwon,Young-Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
One hundred seven plant essential oils were tested for insecticidal activities against Bemisia tabaci B and Q biotype adults, using the fumigation and direct spray methods. In the fumigation assay with the Q biotype adults, garlic oil was the most toxic (1.5×10-3 μl/cm3) on the basis of the LC50 value. Clove leaf, thyme, oregano (origanum), clove bud, savory, cinnamon bark, dabana, vetiver haiti and catnip essential oils also gave potent toxicity with the range of 1.7 to 4.5×10-3 μl/cm3 of LC50 values. These essential oils showed similar strong toxicity against B biotype. Based on the results obtained from fumigation test, nine plant essential oils were selected for the direct spray application at three concentrations (0.5, 0.1 and 0.02%). A litter difference was obtained between B and Q types in mortality to the tested oils. At the 0.5% concentration, they gave considerable mortality of 76 to 100%. At 0.1%, only garlic essential oil produced 96 to 100% mortality, but the others showed less than 76% mortality. Several plant essential oils appear to be candidates for the control of B. tabaci.
Soon-IL Kim,Sung Hum Yeon,Jae Won Kwon,Hee Sung Yoon,Young Joon Ahn 한국응용곤충학회 2009 한국응용곤충학회 학술대회논문집 Vol.2009 No.10
The larvicidal activity of materials from Ostericum koreanum (Apiaceae) root against late 3rd or early 4th instar larvae of Aedes aegypti and Culex pipiens pallens was examined using standard WHO technique under laboratory conditions. Results were compared with those of temephos. The biologically active constituents of O. koreanum root were characterized as four coumarines; isoimperatorin (I), osthol (II), oxypeucedanin (III) and imperatorin (IV) by spectroscopic analysis, including EI-MS, LC-MS, 1H NMR and 13C NMR spectroscopy. On the basis of 24-hr LC50 values, osthol among these four coumarines was the most toxic against Ae. aegypti (1.97 ppm) and Cx. pipiens pallens (1.87 ppm) larvae, but its activity was less than temephos (0.0047 and 0.013 ppm, respectively). LC50 values of isoimperatorin, oxypeucedanin and imperatorin derived from O. koreanum root against Ae. aegypti larvae were 2.46, 6.92 and 2.17 ppm, and against Cx. pipiens pallens larvae, were 1.99, 5.04 and 3.68 ppm. The results indicate that both materials and coumarines from O. koreanum root have potential to be used for mosquito control.
Yeon, Yeung Kyu,Park, Hae Sang,Lee, Jung Min,Lee, Ji Seung,Lee, Young Jin,Sultan, Md. Tipu,Seo, Ye Bin,Lee, Ok Joo,Kim, Soon Hee,Park, Chan Hum Informa UK (TaylorFrancis) 2018 Journal of Biomaterials Science. Polymer Edition Vol. No.
<P>Open reduction with internal fixation is commonly used for the treatment of bone fractures. However, postoperative infection associated with internal fixation devices (intramedullary nails, plates, and screws) remains a significant complication, and it is technically difficult to fix multiple fragmented bony fractures using internal fixation devices. In addition, drilling in the bone to install devices can lead to secondary fracture, bone necrosis associated with postoperative infection. In this study, we developed bone clip type internal fixation device using three- dimensional (3D) printing technology. Standard 3D model of the bone clip was generated based on computed tomography (CT) scan of the femur in the rat. Polylacticacid (PLA), hydroxyapatite (HA), and silk were used for bone clip material. The purpose of this study was to characterize 3D printed PLA, PLA/HA, and PLA/HA/Silk composite bone clip and evaluate the feasibility of these bone clips as an internal fixation device. Based on the results, PLA/HA/Silk composite bone clip showed similar mechanical property, and superior biocompatibility compared to other types of the bone clip. PLA/HA/Silk composite bone clip demonstrated excellent alignment of the bony segments across the femur fracture site with well-positioned bone clip in an animal study. Our 3D printed bone clips have several advantages: (1) relatively noninvasive (drilling in the bone is not necessary), (2) patient-specific design (3) mechanically stable device, and (4) it provides high biocompatibility. Therefore, we suggest that our 3D printed PLA/HA/Silk composite bone clip is a possible internal fixation device.</P>
스마트 센서 기반의 교량 시설물 안전 모니터링 기법 연구
연상호 ( Sang-ho Yeon ),김종수 ( Joon-soo Kim ),연춘흠 ( Chun-hum Yeon ) 한국지리정보학회 2019 한국지리정보학회지 Vol.22 No.2
Today, many smart sensor’s measurement instruments are used to check the safety situation of various medium and large bridge structures that should be maintained in the construction facilities, but most of them use the method of measuring and confirming the displacement behavior of the bridge at regular intervals. In order to continuously check the safety situation, various measuring instruments are used, but most of them are not able to measure and measure the displacement and behavior of main construction structures at regular intervals. In this study, GNSS and environment smart sensors and drone’s image data are transmitted to wireless network so that risk of many bridge’s structures can be detected beforehand. As a result, by diagnosing the fine displacement of the bridge in real time and its condition, reinforcement, repair and disaster prevention measures for the structural parts of the bridges, which are expected to be dangerous, and various disasters and accidents can be prevented, and disaster can be prevented could suggest a new alternative.