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Dong Hui,Zhu Kai-hui,Zhao Qian,Bai Xue-ping,Zhou Jin-cheng,Zhang Li-sheng 한국응용곤충학회 2021 Journal of Asia-Pacific Entomology Vol.24 No.3
The fall armyworm, Spodoptera frugiperda, is a dangerous pest of cereals originating from the tropical and sub tropical parts of the Americas. It has invaded over a hundred countries and is spreading rapidly throughout East Asia. Biological control programs are a “model strategy” for the control of invasive pests. Egg parasitoids Tele nomus remus and Trichogramma pretiosum are viewed as candidates for the control of S. frugiperda. The aim of this study was to evaluate the behavioral patterns and parasitism efficacy of Te. remus, Tr. pretiosum, and Tricho gramma dendrolimi on S. frugiperda egg masses with and without scales. The proportion of parasitism by Te. remus was significantly higher than that by Tr. dendrolimi and Tr. pretiosum. The proportion of parasitism by Tr. pre tiosum and Tr. dendrolimi on egg masses with scales was significantly lower than that on egg masses without scales. However, Te. remus had a similar proportion of parasitism on egg masses with and without scales. Residence time, oviposition time, oviposition frequency, risk of host being found, and risk of parasitism by Te. remus were significantly higher than the corresponding parameters of Tr. pretiosum and Tr. dendrolimi. Tr. pre tiosum females exhibited a higher residence time, oviposition time, oviposition frequency, risk of host being found, and risk of parasitism than those of Tr. dendrolimi females. In addition, Te. remus females often crept into the scale layer covering the egg masses, whereas Tr. dendrolimi and Tr. pretiosum females did not; they could only parasitize the eggs located on the periphery of the egg mass. Both Te. remus and Tr. pretiosum females had similar proportions of superparasitism, which were significantly higher than that of Tr. dendrolimi. Therefore, Te. remus is the dominant egg parasitoid of S. frugiperda and this has important implications for developing augmentative biological control strategies for S. frugiperda.
Donghui Peng,Mengmeng Gu,Yan Zhao,Fei Yu,Hyun-Sug Choi 한국원예학회 2018 원예과학기술지 Vol.36 No.4
This study investigated the potential of using biochar as a container substrate component to replace peat moss to produce horticultural crops. Biochar was incorporated into commercially available peat moss-based substrate (PM) at 0%, 20%, 40%, 60%, 80% and 100% (vol.) to grow chrysanthemum (Dendranthema grandiflorum), tomato (Solanum lycopersicum), lettuce (Lactuca sativa) and basil (Ocimum basilicum) in containers. Responses of plant growth to the percentage of biochar in substrate mixes was different for the crops. Chrysanthemum grown in PM mixes with 60%, 80% and 100% biochar had significantly higher shoot fresh weight (FW) than in PM alone (0% biochar), while tomato plants in PM mixes with 80% and 100% biochar had lower shoot FW, dry weight (DW), and root rating values. For lettuce, only plants grown in 100% biochar of the second crop (sowed after 52 days of the first crop) had lower FW than those grown in PM mixes without biochar. For basil, the lower root rating was observed in plants grown in PM mixes with 80% biochar, while the highest was observed in plants grown in PM mixes with 20% biochar. Basil grown in PM mixes with 20% biochar had higher dry and fresh weights than those in PM mixes with no biochar. No negative effect on plant growth was observed in mixes with biochar as high as 60%, which was probably due to the similarity between physical properties of biochar and PM tested in this experiment.
A Light-Weight AES Design using LFSR-based S-Box for IoT Applications
Donghui Lee,Myeongjin Kwak,Jungwon Lee,Yongtae Kim,Beomjun Kim 대한전자공학회 2022 IEIE Transactions on Smart Processing & Computing Vol.11 No.2
This paper presents a novel light-weight AES architecture based on linear feedback shift register (LFSR). Since the traditional substitution-box (S-box) of the AES architecture consumes a large amount of hardware resources, we propose LFSR-based S-box and inverse S-box designs to reduce the hardware overheads significantly. In addition, we replace the conventional AES key scheduler with the LFSR-based round key generator to improve the hardware efficiency further. When implemented in a 32-nm CMOS technology, the proposed designs improve the area, delay, power, and energy by 57.4%, 64.3%, 30.1%, and 75% in the AES-128, 52.2%, 12.5%, 21.9%, and 31.7% in the AES-192, and 54.8%, 5.2%, 23.4%, and 27.4% in the AES-256, respectively, when compared to the traditional S-box based AES architecture. In addition, a joint analysis of our designs in terms of area, delay, and energy shows that the proposed AES designs enhance the area-delay product (ADP) and energy-delay product (EDP) by up to 84.7% and 82.5%, respectively, compared to the traditional design.
Methodology for deploying ASF monitor sites in South Korea
Donghui Yu,Chansik Park,Sangjeong Lee,Sunghoon Yang,Changbok Lee 제어로봇시스템학회 2009 제어로봇시스템학회 국제학술대회 논문집 Vol.2009 No.8
There has been interest in recent years in backup systems in case of the loss of GPS in South Korea. The Ministry of Maritime Affairs and Fisheries had conducted the feasibility study using DGPS beacon signal and recently Ministry of Land, Transport and Maritime Affairs started to examine eLoran (enhanced Loran) system, especially in the Harbor Entrance and Approach (HEA). In order to meet this HEA accuracy requirement, user receivers must employ Additional Secondary Factors (ASFs) in calculating the user’s position. ASFs are time adjustments that modify the receiver’s Times of Arrival (TOA) to account for propagation over non-seawater paths. As these ASFs vary both spatially and temporally, both variations need to be compensated for to meet the HEA accuracy targets. In the proposedeLoran system, the spatial variations are accounted for through the use of grids of ASF values that are known by the receiver a priori. The temporal variations are accounted for by operating in differential mode; specifically, a nearbyreference monitor station estimates and broadcasts the temporal changes in the ASFs relative to the published spatial grids. The U.S. Coast Guard Academy is conducting research and proof-of concept demonstrations of the ability of enhanced Loran to support the HEA navigational requirements. In this paper, we outline the methodology to import and deploy the eLoran system in South Korea; especially, ASF grid development techniques and location of monitor sites and operations in Busan Harbor referring to the efforts of The United States.
STATR: A simple analysis pipeline of Ribo-Seq in bacteria
Donghui Choe,Bernhard Palsson,Byung-Kwan Cho 한국미생물학회 2020 The journal of microbiology Vol.58 No.3
Gene expression changes in response to diverse environmental stimuli to regulate numerous cellular functions. Genes are expressed into their functional products with the help of messenger RNA (mRNA). Thus, measuring levels of mRNA in cells is important to understand cellular functions. With advances in next-generation sequencing (NGS), the abundance of cellular mRNA has been elucidated via transcriptome sequencing. However, several studies have found a discrepancy between mRNA abundance and protein levels induced by translational regulation, including different rates of ribosome entry and translational pausing. As such, the levels of mRNA are not necessarily a direct representation of the protein levels found in a cell. To determine a more precise way to measure protein expression in cells, the analysis of the levels of mRNA associated with ribosomes is being adopted. With an aid of NGS techniques, a single nucleotide resolution footprint of the ribosome was determined using a method known as Ribo- Seq or ribosome profiling. This method allows for the highthroughput measurement of translation in vivo, which was further analyzed to determine the protein synthesis rate, translational pausing, and cellular responses toward a variety of environmental changes. Here, we describe a simple analysis pipeline for Ribo-Seq in bacteria, so-called simple translatome analysis tool for Ribo-Seq (STATR). STATR can be used to carry out the primary processing of Ribo-Seq data, subsequently allowing for multiple levels of translatome study, from experimental validation to in-depth analyses. A command- by-command explanation is provided here to allow a broad spectrum of biologists to easily reproduce the analysis.
Analysis of the Ionospheric Effect for Time Offsets per GPS Code Measurements
Donghui Yu,Sangwook Hwang,Youngkyu Lee,Sunghoon Yang,Changbok Lee 보안공학연구지원센터 2015 International Journal of Software Engineering and Vol.9 No.8
This paper shows the analysis results of time offsets using P1, P2 and P3 code in GPS time transfer. The r2cggtts program has been used in GNSS Time Transfer and use the P3 ionosphere free combination of P1 and P2 code measurements. We modified the r2cggtts program in order to calculate and write all kinds of time offsets P3 as well as P1 and P2. The result of the modified r2cggtts program shows that time offsets using P1 and P2 are of wide distribution comparing to time offsets using P3. In order to Figure out the error factors for wide distributions of P1 and P2, we analyze and present the relation between the elevation angle and time offsets in this paper.