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Biological control of insect pests in Korea: a perspective
Minho Lee,Youngwoo Nam,Mun Il Ryoo 한국응용곤충학회 2010 한국응용곤충학회 학술대회논문집 Vol.2010 No.10
Dynamics of prey/host and predator/parasitoid interaction has been the main concern of the population ecology during the second half of the 20th century. Many theoretical and experimental studies have been conducted and discussed. The main questions were whether the interaction could be in stable state and whether the parasitoid/predator could regulate the host/prey populations, and if so at what levels. The questions are not yet solved, but some hypotheses have been presented that the prey/predator interaction could be in stable state, when both the predator and prey population are under intraspecific competition so that both populations could be limited at a low levels. This prerequisite, however, could not be easily satisfied in nature and several hypotheses have been discussed up to date. Biological control of pests, which is based on the predator-prey system dynamics, has not always been successful, because we do not understand the systems sufficiently. Thus, most successful cases of the biological control were dependent upon ‘trial and error’. But as the predator-prey system dynamics could be well understood in the future, more systemic control program of biological control could be possible. In this review, we analyzed the studies for biological control of pests in Korea based on 164 cases reported in the last forty years and will consider the future goal of the studies for more reliable control programs.
High-speed and energy efficient carry select adder (CSLA) dominated by carry generation logic
Nam, Minho,Choi, Yeonhun,Cho, Kyoungrok Elsevier 2018 Microelectronics Journal Vol.79 No.-
<P>This paper presents a high-speed, energy efficient carry select adder (CSLA) dominated by carry generation logics. The proposed architecture is composed of three functional stages - a Primary Carry Unit (PCU), an Intermediate Wave Carry Unit (WCU) and a Final Selection Unit (FSU) - that are partitioned with the appropriate bit-width. We synthesized the blocks with random logic use functional blocks for which the input and output consist only of carry functions. The CSLA is partitioned into bit-slice logics to reduce the propagation delay, and we analytically optimized the bit-slice width of the functional blocks. The proposed architecture skips the carry computation in the first stage of each bit-slice block. We used 180 nm CMOS technology to implement the proposed CSLA for various input bit widths. The results show that the proposed CSLA reduces the computational delay by 24%, power consumption by 17% and PDP by 37% compared to conventional implementations.</P>
Nexus between Inflation, Inflation Perceptions and Expectations
NAM, MINHO,GO, MINJI Korea Development Institute 2018 KDI Journal of Economic Policy (KDI JEP) Vol.40 No.3
We uncover a nexus between actual inflation, inflation perceptions and expectations in Korea through analyzing micro as well as aggregate data from the Consumer Survey. We document two novel findings. First, households' subjective perceptions of inflation exert more impact on expectation formation than actual inflation. Second, inflation perceptions are broadly in line with the trajectory of the inflation trend. This is attributable to the fact that changes in actual inflation have been generated mainly by the consumption items whose price changes are perceived more sensitively as those items are frequently bought or have a larger share in household expenditures. Conducting a cross-country comparison, we find that information rigidity in expectation formation process and the nexus between perceptions and expectations of inflation prove to be stronger in Korea. Additionally, we reconfirm the existing finding that the scope of information utilized for forming inflation expectations is fairly circumscribed.
Ki Hong Yum,Jum Rae Cho,Minho Lee,Young Nam Youn 한국응용곤충학회 2008 한국응용곤충학회 학술대회논문집 Vol.2008 No.10
This study was carried out to investigate the effect of each single component of the synthetic sex pheromone in the rice green caterpillar, Naranga aenescens and rice leaf roller, Cnaphalocrocis medinalis. Trap catches with each single component or binary mixtures of the sex pheromone in N. aenescens were significantly lower than that with an optimum mixture (2: 1: 4) of Z9-14:Ac, Z9-16:Ac and Z11-16:Ac. But only few number of C. medinalis male was caught in trap baited with each component of the sex pheromone excepting Z13-18:Ald. In an optimum composition of the sex pheromone in C. medinalis, trap catches baited with an 11: 100: 11 mixture of Z11-18:Ald, Z13-18:Ald, and Z13-18:Ac without two alcohol components (Z11-18:OH and Z13-18:OH) was higher than that baited with an optimum mixture of Z11-18:Ald, Z13-18:Ald, Z11-18:OH, Z13-18:OH, and Z13-18:Ac. The efficacy of the sex pheromone lure of N. aenescens kept over 4 weeks. The occurrence of N. aenescens caught in trap baited with sex pheromone gave three peaks and C. medinalis showed two distinct peaks throughout the flight season. Therefore, it can be expected that pheromone-baited trap provides a simple tool for monitoring N. aenescens and C. medinalis in Korea.
Traffic Load Distribution-Based Excess Bandwidth Allocation in Time-Division-Multiplexed PONs
Nam-Uk Kim,Hyun-Su Lim,Hong-Shik Park,Minho Kang IEEE 2009 Journal of Lightwave Technology Vol.27 No.19
<P>Time-division-multiplexed passive optical networks (TDM-PONs) have been successful solutions for providing the huge bandwidth needed for quadruple-play services in last-mile networks. In this paper, the effects of excess bandwidth provisioning applied to a reservation-based TDM are analyzed in detail, and noble adaptive excess timeslot provisioning (ETP) mechanisms are proposed in the interoptical network unit (ONU) and intra-ONU domain in the TDM-PONs. Using traffic load distribution information observed in an optical line termination (OLT), a proposed deficit reservation-based dynamic bandwidth allocation, called dr-DBA, controls the amounts of excess timeslot bandwidths in order to efficiently serve the burst traffic of heavy-loaded ONUs while guaranteeing strict fair link-sharing. The authors also introduce a service work-based ETP bandwidth reservation as well as an optimal reservation class selection mechanism to support prioritized service in an intra-ONU so that serious node light-load penalty and bandwidth overbooking can be minimized. The performance results achieved by numerical analysis and simulations prove that proposed ETP mechanisms provide fair and optimal excess bandwidths to the ONUs according to the changes in traffic load distribution, while compensating the systematic weakness of each mechanism in both ONU domains.</P>
Minho Kim,최의호,이경재,정동협,Taemyung Kwak,소병찬,KapRyeol Ku,Okhyun Nam 한양대학교 세라믹연구소 2020 Journal of Ceramic Processing Research Vol.21 No.5
We investigated the effects of NH3 pretreatment time on N-polar GaN grown on 4o off-cut C-face 4H-SiC using hightemperature metal-organic chemical vapor deposition. The NH3 pre-treatment time was changed from 2 to 32 minutes at1,350 oC. The polarity of layer was confirmed by aqueous KOH etching method. As the NH3 treatment time increased, the etchrate of the layer was increased and the structural and optical properties were deteriorated. The total hillock density of sampleswas 7.5, 12.9, and 25.1 × 102 cm-2 respectively. Furthermore, we compared the luminescence spectra of Ga-polar and N-polarGaN films using low-temperature photo-luminescence measurement. The N-polar GaN layer showed Y1 peak (3.45 eV), whichis attributed to the existence of inversion domain boundary (IDB) in the layer.
Systematic targeted gene deletion using the gene-synthesis method in fission yeast
Nam, Miyoung,Lee, Sook-Jeong,Han, Sangjo,Kim, Dongsup,Lee, Minho,Kang, Eun-Jung,Park, Han-Oh,Lee, Ah-Reum,Lee, Sol,Kim, Cheol-Hee,Kim, Dong-Uk,Hoe, Kwang-Lae Elsevier 2014 Journal of microbiological methods Vol.106 No.-
<P><B>Abstract</B></P> <P>Genome-wide targeted gene deletion, a systematic method to study gene function by replacing target genes with deletion cassettes, using serial-PCR or block-PCR requires elaborate skill. We developed a novel gene-synthesis method to systematically prepare deletion cassettes on a 96-well basis in fission yeast. We designed the 2129-bp deletion cassette as three modules: a central 1397-bp KanMX4 selection marker module and two flanking 366-bp gene-specific artificial linker modules. The central KanMX4 module can be used in multiple deletion cassettes in combination with different sets of flanking modules. The deletion cassettes consisted of 147 oligonucleotides (93 for the central module+25 for each of the flanking modules+4 for the joints) and the oligonucleotides were designed as ~29mers using an in-house program. Oligonucleotides were synthesized on a 96-well basis and ligated into deletion cassettes without gaps by ligase chain reaction, which was followed by two rounds of nested PCR to amplify trace amounts of the ligated cassettes. After the artificial linkers were removed from the deletion cassettes, the cassettes were transformed into wild-type diploid fission yeast strain SP286. We validated the transformed colonies via check PCR and subjected them to tetrad analysis to confirm functional integrity. Using this method, we systematically deleted 563 genes in the fission yeast <I>Schizosaccharomyces pombe</I> with a >90% success rate and a point-mutation rate of ~0.4 mutations per kb. Our method can be used to create systematic gene deletions in a variety of yeasts especially when it included a bar-code system for parallel analyses.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The deletion cassette was designed as three modules consisting of ~29-mer oligos. </LI> <LI> The oligonucleotide set of the KanMX4 module was commonly used. </LI> <LI> Ligation chain reaction was optimized at 58.3°C and 40cycles. </LI> <LI> Nested PCR using artificial linkers yielded sufficient quantity of deletion cassette. </LI> <LI> The gene-synthesis method yielded a success rate of >90% gene deletion. </LI> </UL> </P>