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조준기,이민호,반상우,성정훈,이덕동 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1
In this paper, we propose a new smart sensor scheme using neural networks. The proposed smart sensor automatically generates not only an averaged output of a sensor but also the reliability of the outputs that have an ambiguity. We demonstrate the performance of the proposed method using computer generated data and experimental data obtained from gas sensor.
Charge-Transfer-Induced p-Type Channel in MoS<sub>2</sub> Flake Field Effect Transistors
Min, Sung-Wook,Yoon, Minho,Yang, Sung Jin,Ko, Kyeong Rok,Im, Seongil American Chemical Society 2018 ACS APPLIED MATERIALS & INTERFACES Vol.10 No.4
<P>The two-dimensional transition-metal dichalcogenide semiconductor MoS2 has received extensive attention for decades because of its outstanding electrical and mechanical properties for next-generation devices. One weakness of MoS2, however, is that it shows only n type conduction, revealing its limitations for homogeneous PN diodes and complementary inverters. Here, we introduce a charge-transfer method to modify the conduction property of MoS2 from n-to p-type. We initially deposited an n-type InGaZnO (IGZO) film on top of the MoS2 flake so that electron charges might be transferred from MoS2 to IGZO during air ambient annealing. As a result, electron charges were depleted in MoS2. Such charge depletion lowered the MoS2 Fermi level, which makes hole conduction favorable in MoS2 when optimum source/drain electrodes with a high work function are selected. Our IGZO-supported MoS2 flake field effect transistors (FETs) clearly display channel-type conversion from n-to p-channel in this way. Under short-and long-annealing conditions, n-and p-channel MoS2 FETs are achieved, respectively, and a low-voltage complementary inverter is demonstrated using both channels in a single MoS2 flake.</P>
Preventive Pest Management Using Field Borders and Companion Plants for Organic Farming
Minho Lee,Byungmo Lee,Eun Jung Han,Jong-Ho Park,Sang-Beom Lee,Kwang-Lai Park,Jin-Ho Kim 한국응용곤충학회 2014 한국응용곤충학회 학술대회논문집 Vol.2014 No.04
Materials are limited for pest control and chemical pesticides are prohibited in organic farming. Thus, the concept of pest control may not be effective for pest management in organic farm. As an alternative approach, landscape management is potentially effective and useful approach for preventing pathogen and insect pests in organic farm. It is needed to develop best practices utilizing functional biodiversity for pest management through landscape management. For this purpose, we investigated the effect of companion plants on species richness of insect pests and natural enemies in the field border area and in the crop plants (rice and soybean). In rice paddy fields, Lysimachiae foenum-graecum, Saururus chinensis were selected as effective companion plants on the paddy field levee for conserving Arachnidae as natural enemy and density suppression of insect pest such as Lissorphoptrus oryzophilus, Riptortus clavatus. As a result, damage rate of rice plant by insect pests was significantly lower (2.5%) and yield rate of healthy grains was significantly higher (8.7%) than control. In soybean fields, Marigold plants such as Tagetes patula, T. officinalis, increased Arthropod species richness and ratio of natural enemy group, and decreased ratio of insect pest group. As a result, yield (weight of 100 seeds) of healthy soybean was significantly increased (2.5%) than control. The 2nd infection rate from damage by R. clavatus was significantly lower in the treated plot than that in control. Thus, yield rates of healthy soybean in the control and the companion plant-treated plot were 79.0% and 84.3%, respectively, compared to conventional farming using chemical pesticides. Therefore, use of companion plants on field border was an effective practices for preventing pest insects and increasing yield in organic farming.