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Four Psyllids (Hemiptera: Sternorrhyncha: Psylloidea), new to Korea
Geonho Cho,Seunghwan Lee 한국응용곤충학회 2015 한국응용곤충학회 학술대회논문집 Vol.2015 No.04
Psyllids are small sap sucking insects. Around 4,000 species are described worldwide. They show their greatest diversity in the tropical and south temperate zones. Several psyllid species are pest of crops such as citrus, pear, potato and tomato. They has been also responsible for extensive damage to ornamental trees. In this study, we report four psyllids species, new to Korea: Cacopsylla satsumensis (Kuwayama, 1908) on Raphiolepis indica (Rosaceae), Calophya nigridorsalis Kuwayama, 1908 on Rhus spp. (Anacardiaceae), Carsidara limbata Enderlein, 1926 on Firmiana simplex (Sterculiaceae) and Trioza machilicola Miyatake, 1968 on Machilus thunbergii (Lauraceae). All of them were found as large colonies, severely feeding on host plants, excreting sticky honeydew on which blackish sooty mold grows. Carsidara limbata secrete pale wax masses. Cacopsylla satsumensis cause leaf distortion and Trioza machilicola make galls underside of the leaves.
MULTI-APERTURE IMAGE PROCESSING USING DEEP LEARNING
GEONHO HWANG,CHANG HOON SONG,TAE KYUNG LEE,HOJUN NA,MYUNGJOO KANG 한국산업응용수학회 2023 Journal of the Korean Society for Industrial and A Vol.27 No.1
In order to obtain practical and high-quality satellite images containing high- frequency components, a large aperture optical system is required, which has a limitation in that it greatly increases the payload weight. As an attempt to overcome the problem, many multi-aperture optical systems have been proposed, but in many cases, these optical systems do not include high-frequency components in all directions, and making such an high-quality image is an ill-posed problem. In this paper, we use deep learning to overcome the limitation. A deep learning model receives low-quality images as input, estimates the Point Spread Function, PSF, and combines them to output a single high-quality image. We model images obtained from three rectangular apertures arranged in a regular polygon shape. We also propose the Modula- tion Transfer Function Loss, MTF Loss, which can capture the high-frequency components of the images. We present qualitative and quantitative results obtained through experiments.
Elucidating the Interactions of ROS with Cancer Cell and Normal Cell Membranes
Geonho CHO,Deborah LEE,Sun Min KIM,Tae-Joon JEON 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Currently various methods are being tried to treat tumor tissue. One of treatment is the photodynamic therapy (PDT). It generates reactive oxygen species (ROS), which directly induces apoptosis or necrosis of tumors. Many studies focused on changes in mitochondria or internal signaling. But there was no comparison between tumor and normal cell membranes about ROS effect, even though they affect membranes1. Therefore, we studied the response to ROS using planar lipid bilayer and liposomes to determine their effect on cell membranes in the environment in which ROS are produced. In the ROS environment, it was affected by lipid bilayer containing unsaturated lipids. In the symmetrical tumor cell lipid+bilayer, it showed only unstable appearance and was not destroyed because of ROS. On the other hand, asymmetric lipid bilayer that mimics normal cells and only consist of unsaturated lipid bilayer were observed to have a membrane destroyed in the ROS environment. In liposomes experiment, the most leakage occurred from a mimicking of an asymmetrical normal cell. As a result, we observed that mimicked normal cell membranes were most affected by ROS, and mimicked tumor cell membranes are relatively less affected.
Geonho Cho,Hiromitsu Inoue,Seunghwan Lee 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.04
Nomenclatural changes are provided for Sorbus-feeding Cacopsylla moiwasana (Kuwayama, 1908) species group. Thirteen Palaearctic Cacopsylla species have been recorded from Sorbus L. (Rosaceae), and of these, seven species restricted to East Asia. Among the East Asian species, four Japanese species, i.e. C. elegans Inoue, 2004, C. jezoensis (Miyatake, 1963), C. midoriae (Miyatake, 1963) and C. moiwasana (Kuwayama, 1908), assigned to C. moiwasana species group. Above the latter three species very similar to each other, allopatrically distributed, and all or some of them could be synonymous. The present investigation of the type material resulted in confirmation that Psylla jezoensis and P. midoriae should be treated as junior synonym of P. moiwasana. The following synonyms are proposed: Cacopsylla moiwasana (Kuwayama, 1908) = Psylla jezoensis Miyatake, 1963, syn. nov., Psylla midoriae Miyatake, 1963, syn. nov. The species are newly recorded from Korea.
Systematics of the east Palaearctic pear psyllids (Hemiptera: Psylloidea: Psyllidae)
Geonho Cho,Daniel Burckhardt,Hiromitsu Inoue,Xinyu Luo,Seunghwan Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
The confused taxonomy of the east Palaearctic pear psyllids, serious pests on cultivated pear, is reviewed. Fifty-sixnominal species have been reported from Pyrus, 25 of which we consider valid and ten as not being associated withPyrus. Our taxonomic revision suggests that, in Korea, four Cacopsylla species develop on pear. Three species occuralso in Japan. New synonyms are suggested and seasonal dimorphism are critically discussed.Key words : Psyllidae, Cacopsylla, taxonomy, host plant, Pyrus, Rosaceae, Manchrian pear, Asian pear, European pear, China,Japan, South Korea, Russian Far East
Geonho Cho,Seunghwan Lee 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.04
The superfamily Psylloidea of Korean Peninsula is systematically revised. Systematic studies on the Psylloidea are conducted mainly three themes: (1) The taxonomic review of superfamily Psylloidea (Hemiptera: Sternorrhyncha) in the Korean Peninsula, (2) DNA barcoding for the correction of taxonomic confusions and confirmation of seasonal forms, and (3) molecular phylogeny of Psylloidea to elucidate higher group relationships and to test current controversial morphological classifications.
Current status and example of risk assessment for exotic insects
Geonho Cho,Seunghwan Lee 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
The unexpected introductions of exotic organisms between different countries are being accelerated by the global climate change and increasing international trade. Especially, many exotic insects cause serious economic losses and ecological disturbance in invaded areas. Since the uncertainty of potential impact, a priori conception has to be established for better emergency response. The risk assessment of national and foreign examples will be presented together with an evaluation of the current status.
Geonho Cho,Seunghwan Lee 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
Jumping plant-lice (Hemiptera: Psylloidea) are known for a few deleterious pest species worldwide, yet the phylogeny of the group has been poorly understood. The goal of researching the Korean Psylloidea is to achieve a total overview of the group. The systematic study relies on three main pillars which are i) the taxonomic review of superfamily Psylloidea in the Korean Peninsula, ii) the correction of taxonomic confusions caused by phenetic plasticity and iii) the molecular phylogeny of Psylloidea to elucidate the higher-level phylogenetic relationships among the families and subfamilies of the superfamily Psylloidea. Discussions of the early diversification and evolution of Psylloidea will be presented together with comments on biogeography and host plant association.