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Engineering Electronic Properties of Graphene by Coupling with Si-Rich, Two-Dimensional Islands
Lee, Dong Hyun,Yi, Jaeseok,Lee, Jung Min,Lee, Sang Jun,Doh, Yong-Joo,Jeong, Hu Young,Lee, Zonghoon,Paik, Ungyu,Rogers, John A.,Park, Won Il American Chemical Society 2013 ACS NANO Vol.7 No.1
<P>Recent theoretical and experimental studies demonstrated that breaking of the sublattice symmetry in graphene produces an energy gap at the former Dirac point. We describe the synthesis of graphene sheets decorated with ultrathin, Si-rich two-dimensional (2D) islands (<I>i.e.</I>, Gr:Si sheets), in which the electronic property of graphene is modulated by coupling with the Si-islands. Analyses based on transmission electron microscopy, atomic force microscopy, and electron and optical spectroscopies confirmed that Si-islands with thicknesses of ∼2 to 4 nm and a lateral size of several tens of nm were bonded to graphene <I>via</I> van der Waals interactions. Field-effect transistors (FETs) based on Gr:Si sheets exhibited enhanced transconductance and maximum-to-minimum current level compared to bare-graphene FETs, and their magnitudes gradually increased with increasing coverage of Si layers on the graphene. The temperature dependent current–voltage measurements of the Gr:Si sheet showed approximately a 2-fold increase in the resistance by decreasing the temperature from 250 to 10 K, which confirmed the opening of the substantial bandgap (∼2.5–3.2 meV) in graphene by coupling with Si islands.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/ancac3/2013/ancac3.2013.7.issue-1/nn304007x/production/images/medium/nn-2012-04007x_0002.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/nn304007x'>ACS Electronic Supporting Info</A></P>
JaeSeok Lee,Myeonghwan Kim,Jong Bong Choi,HyunJi Lee,YoungHo Kim,KyungHwan Moon,Changhoe Jeong,Wook-Gyo Lee,Young Ho Kim,Jongkyun Park 한국응용곤충학회 2018 한국응용곤충학회 학술대회논문집 Vol.2018 No.10
Heamaphysalis longicornis is a major vector for Severe Fever with Thrombocytopenia Syndrome (SFTS) virus and the density of the vector has been increasing because of the climate change. The incidence of fatalities due to SFTS is increasing every year. In this study, to evaluate the SFTS transmission by ticks, the density of ticks mediating SFTS was monitored. Tick was collected every month from four different sites (Grass land, Mountain path, Grave, Copse) in Andong with the traps containing dry ice as CO2 attractants. Among 2,572 ticks of 3 species; H. longicornis, H. flava, and Ixodes nipponensis were most abundantly collected from April to August. H. longicornis is the richest species (92.8%), whereas Ixodes nipponensis was the least species (0.8%). The 54.5% of the sample were nymph stage and female/male ratio was 64.3%. According to the pathogene analysis, SFTS virus was detected from H. longicornis adult and larvae stages collected in July and August. In July samples, SFTS virus was detected only from grassland site, but the virus was observed in the sample from all four sites in August. For effective prevention of SFTS, the tick density should be continuously monitored based on the onset time of SFTS with the consideration of habitate, habit & life history of ticks.
Monitoring and Detection of SFTS virus mediated ticks in Andong in 2018
JaeSeok Lee,Myeonghwan Kim,Jong Bong Choi,HyunJi Lee,KyungHwan Moon,YeongHo Kim,Changhoe Jeong,Wook-Gyo Lee,Jongkyun Park,Young Ho Kim 한국응용곤충학회 2019 한국응용곤충학회 학술대회논문집 Vol.2019 No.04
We monitored the population of Haemaphysalis longicornis, in Andong, Gyungbuk from April to November, 2018. Among total 2,994 ticks collected for 8 months, H. longicornis 1,677(56%), H. spp Larva 1,074(35.9%), H. flava 213(7.1%), Ixodes nipponensis 30(1.0%) were identified. In addition, considering the environment, 1,727(57.7%), 907(30.3%), 192(6.4%) and 168(5.6%) ticks were collected in the grassland, graves, copse, mountain path, respectively. In the pathogen diagnosis with PCR using SFTS virus specific primers, positive viruses were detected in H. longicornis, H. flava and H. spp from June to October. The minimum field infection rate of June, July, August, September and October were 0.4%, 0.8%, 1.2%, 0.8% and 2.3%. respectively.
Characteristics and distribution of terpenes in South Korean forests
Lee, Jaeseok,Cho, Kyoung Sang,Jeon, Youngjae,Kim, Ji Beom,Lim, Young-ran,Lee, Kyungho,Lee, Im-Soon The Ecological Society of Korea 2017 Journal of Ecology and Environment Vol.41 No.5
The importance of forests continues to increase throughout the world, and one of the reasons is that a forest is a major place to emit terpenes, which have been reported to be beneficial to human health. In South Korea, forests occupy about 64% of the total land area and consist mainly of pine and oak trees. Since only a limited number of forests have been analyzed to date, a comprehensive understanding of terpenes emitted from regional forests remains in its infancy in Korea. Here, to gain insights into terpenes from regional forests located in South Korea, we review the characteristics of Korean forests and recent studies on major terpenes emitted from regional forests as well as from native trees dominant in South Korea. We also discuss meteorological factors that affect the terpene emissions in Korean forests. In conclusion, 18 types of terpenes were detected in Korean forests and their compositions in different forests are largely dependent on the dominant plant species in the forest. Moreover, terpene emissions in Korean forests are affected by various environmental factors, including temperature, amount and duration of daylight, season, and age of trees. To improve the understanding of the characteristics of terpene distribution, more studies are required on the terpene production of Korean forests in various regions.
Jaeyong Lee,Kwang yeol Lee,Sungchul Park,Jaeseok Choi,Hong gi Jang,Joon Chul Kim 한국환경생태학회 2015 한국환경생태학회지 Vol.29 No.2
We quantified temporal and spatial changes in the habitat for fish populations, the distribution of mandarin fish(Siniperca scherzeri) and an introduced species, largemouth bass(Micropterus salmoides) in Lake Paro and inflowing streams. The number of fish species identified in Lake Paro and the tributary streams included 10 families, 24 species and 10 families 30 species, respectively. The dominant fish species in Lake Paro were Zacco platypus, Hemibarbus labeo, Squalidus gracilis majimae, S. scherzeri and Tridentiger brevispinis, Z. platypus, Z. koreanus, and S. gracilis majimae in the inflowing streams. Although the habitat segregation for S. scherzeri and M. salmoides occurs, these two species showed the use of the fishes of the family Gobiidae as an important prey item based on IRI analysis. S. scherzeri and M. salmoides preyed mainly on T. brevispinis(67.4 %) and R. brunneus(84.0 %), respectively. The species preyed on by S. scherzeri and M. salmoides were benthic fishes that inhabit shallow water depths around the lake and have little swimming ability.
Soft-Input Soft-Output List Sphere Detection with a Probabilistic Radius Tightening
Lee, Jaeseok,Shim, Byonghyo,Kang, Insung IEEE 2012 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.11 No.8
<P>In this paper, we present a low-complexity list sphere detection algorithm for achieving near-optimal a posteriori probability (APP) detection in an iterative detection and decoding (IDD). Motivated by the fact that the list sphere decoding searching a fixed number of candidates is computationally inefficient in many scenarios, we design a criterion to search lattice points with non-vanishing likelihood and then derive a hypersphere radius satisfying this condition. Further, in order to exploit the original sphere constraint as it is instead of using necessary conditioned version, we combine a probabilistic tree pruning strategy and the proposed list sphere search. Two features, tightened hypersphere radius and probabilistic tree pruning, collaborate and improve the search efficiency in a complementary fashion. Through simulations on 4x4 MIMO system, we show that the proposed method provides substantial reduction in complexity while achieving negligible performance loss over the conventional list sphere detection.</P>
Design of PN Code Acquisition System with a Shared Architecture for CDMA PCS Mobile Station
Lee, Seongjoo,Lee, Janghee,Kim, Jaeseok THE RESEARCH INSTITUTE OF ASIC DESIGN YONSEI UNIVE 1999 Journal of the Research Institute of ASIC Design Vol.6 No.1
In this paper, we propose a new architecture of the PN code acquisition system which has some shared hardware blocks in order to reduce the hardware complexity. The proposed system has an energy calculation block which is shared by two active correlators. Our system is designed suitable for IS-95 based CDMA PCS. The new architecture was designed and simulated using VHDL. The gate count is about 7,500. Our proposed architecture is also useful for multi-carrier system which uses the multiple searcher.