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New Records of Korean Noctuidae (Lepidoptera), with Description of a New Species
Sohn, Jae-Cheon,Ronkay, Laszlo 한국응용곤충학회 2001 Insecta Koreana Vol.18 No.3
A new species, Mataeomera esbiahni, sp. nov., is described, and three species; Koyaga virescens (Sugi), Spodoptera mauritia (Boisduval), Orthosia nigromaculata (H<TEX>$\{o}}$</TEX>ne), are reported for the first time from Korea, with illustrations of their genitalia.
Nano-granular Co-Fe-Al-Q Soft Ferromagnetic Thin Films for RF Electromagnetic-noise Filters
Sohn, Jae-Cheon,Byun, Dong-Jin The Korean Institute of Electrical and Electronic 2006 Transactions on Electrical and Electronic Material Vol.7 No.1
Co-Fe-Al-O nano-granular thin films with high electrical resistivity, fabricated by radio frequency magnetron sputtering under an $Ar+O_2$ atmosphere, are found to show good soft magnetic properties in the GHz frequency range. The real part value of the relative permeability is 260 at low frequencies and this value is maintained up to the GHz frequency range. A non-integrated type noise filter on a coplanar waveguide transmission line is demonstrated by using the Co-Fe-Al-O nano-granular thin film with the dimensions of $4\;mm(l){\times}4\;mm(w){\times}0.1\;{\mu}m(t)$. The insertion loss is very low being less than 0.3 dB and this low value is maintained up to 2 GHz. At a ferromagnetic resonance frequency of 3.3 GHz, the degree of noise suppression is measured to be 3 dB. This level of noise attenuation is small for real applications, but there is much room for further improvement by increasing the magnetic volume and integrating the magnetic thin film into the CPW transmission line.
Sohn, Jae-Cheon,Kim, Sung-Eun,Kim, Zee-Won,Yu, Yun-Sik The Korean Institute of Electrical and Electronic 2009 Transactions on Electrical and Electronic Material Vol.10 No.4
$H_2S$ micro-gas sensors have been developed employing $SnO_2$:CuO composite thin films. The films were prepared by e-beam evaporation of Sn and Cu metals on silicon substrates, followed by oxidation at high temperatures. Results of various studies, such as scanning electron microscopy (SEM), X-ray diffraction (XRD) and X-ray photoelectron spectroscopy (XPS) reveal that $SnO_2$ and CuO are mutually non-reactive. The CuO grains, which in turn reside in the inter-granular regions of $SnO_2$, inhibit grain growth of $SnO_2$ as well as forming a network of p-n junctions. The film showed more than a 90% relative resistance change when exposed to $H_2S$ gas at 1 ppm in air at an operating temperature of $350^{\circ}C$ and had a short response time of 8 sec.
Evolution of plant-insect interactions: from fossils to phylogeny
Jae-Cheon Sohn,Sei-Woong Choi 한국응용곤충학회 2016 한국응용곤충학회 학술대회논문집 Vol.2016 No.04
Plant-feeding insects are a ubiquitous feature of terrestrial life. It follows that understanding the evolution of insect herbivory and its diversity is fundamental to understanding the evolution of terrestrial ecosystems. During my Ph. D. study, I found phylogenetic conservatism in the feeding mode (internal vs. external feeding) of Yponomeutoidea, one of the primitive lepidopteran superfamilies, as well as in their diet breadth and in the growth form and taxonomic affinities of host plants they used. In spite of their importance in terrestrial ecosystems, the evolutionary history of Lepidoptera has been poorly known. This mostly is attributable to their poor fossil record. My Ph. D. study provided better understanding to the lepidopteran fossils. Fossils are an essential resource in divergence time estimation using molecular clock methods. Once reliably resolved, dating data can be used in tracing the evolutionary history of Lepidoptera/plant associations. I introduce my works to take such advantages from fossils and phylogenetic studies.
New Records of Korean Noctuidae (Lepidoptera), with Description of a New Species
Sohn, Jae-Cheon,Ronkay, Laszlo Korean Society of Applied Entomology 2001 INSECTA KOREANA Vol.18 No.3
A new species, Mataeomera esbiahni, sp. nov., is described, and three species; Koyaga virescens (Sugi), Spodoptera mauritia (Boisduval), Orthosia nigromaculata (H$\"{o}}$ne), are reported for the first time from Korea, with illustrations of their genitalia.
Leaf-mine trace fossils as evidence of diversification of lepidopteran feeding habits
Jae-Cheon Sohn,Kye Soo Nam,Sei-Woong Choi 한국응용곤충학회 2017 한국응용곤충학회 학술대회논문집 Vol.2017 No.10
Lepidoptera, one of the major herbivore groups on terrestrial ecosystems, have evolved various feeding habits on theirhostplants. Diversification of feeding habits has led to their success in the extant fauna. However, there have been limitedstudies scrutinizing evolutionary patterns of such diversification (Kaila et al., 2011; Regier et al., 2015; Sohn et al., 2016).Leaf-mining is the major form of lepidopteran endophagy, occurring in at least 34 families (Hering, 1951). Leaf miningis considered a primitive trait in Lepidoptera because it characterizes the basal (non-ditrysian) lineages, while the derivedDitrysia and Macrolepidoptera trend strongly toward external feeding (Connor & Taverner, 1997). In contrast, internalfeeding is restricted to relatively derived lineages in other insect orders. This contrasting pattern may be a key for understandingthe evolutionary history of Lepidoptera. We discuss this issue based on two lepidopteran leaf-mine fossils discovered lately.
First Report of Five Noctuid Species (Lepidoptera: Noctuidae) from Korea
Sohn Jae Cheon,Ronkay Laszlo,Choi Sei Woong Korean Society of Applied Entomology 2005 Journal of Asia-Pacific Entomology Vol.8 No.2
Five species of Noctuidae, Adrapsa simplex (Butler), Hydrillodes lentalis $Guen\acute{e}e$, Xylena nihonica $H\ddot{o}ne$, Rhynchaglaea scitula (Butler), and Lophoptera squammigera $Guen\acute{e}e$, are reported for the first time in Korea. Two genera, Adrapsa and Lophoptera, are newly recorded from the Korean fauna. Adults and genitalia of each species are illustrated and their biological and distributional notes are briefly described.
Nano-Granular Cp-Fe-Al-O Soft Ferromagnetic Thin Films for GHz Magnetic Device Applications
Jae Cheon Sohn,변동진 한국세라믹학회 2006 한국세라믹학회지 Vol.43 No.3
Co-Fe-Al-O nanogranular thin films were fabricated by RF-magnetron sputtering under an Ar+O2 atmosphere. High resolution transmission electron microscopy revealed that the Co-Fe-Al-O films are composed of bcc (Co, Fe) nanograins finer than 5 nm and an Al-O amorphous phase. A very large electrical resistivity of 374 cm was obtained, together with a large uniaxial anisotropy field of 50 Oe, a hard axis coercivity of 1.25 Oe, and a saturation magnetization of 12.9 kG. The actual part of the relative permeability was measured to be 260 at low frequencies and this value was maintained up to 1.3 GHz. The ferromagnetic resonance frequency was 2.24 GHz. The resulting Co-Fe-Al-O nanogranular thin films with a high electrical resistivity and high resonance frequency are considered to be suitable for GHz magnetic device applications.
New Records of Three Yponomeutine Moths (Lepidoptera: Yponomeutidae) from Korea
Jae-Cheon Sohn,Kyu-Tek Park,Soowon Cho 한국동물분류학회 2010 Animal Systematics, Evolution and Diversity Vol.26 No.2
Two species of Yponomeutinae new to Korea, Euhyponomeutoides trachydeltus (Meyrick) and Thecobathra anas (Stringer), are reported. In addition, occurrence of Yponomeuta anatolicus (Stringer) in Korea is confirmed with proper collection of data. The adults and genitalia for the three species are illustrated.