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Search Results: 1 - 10 of 26810 matches for " Gihwan Yi "
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Analysis of Low Amylose and Processability Fractured Endosperms Derived from Somatic Variation  [PDF]
Gihwan Yi, Kyung Min Kim
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.46A003
Abstract: Recently, improving eating quality and processing properties has become one of the most important objectives in japonica rice breeding programs in Korea. This study was carried out to determine the agronomy and physicochemical characteristics of the opaque endosperm rice \"S-21-3-8\" regenerated from seed-derived callus culture of a rice cultivar, \"Ilpum\". S3 generation of opaque endosperm mutants selected from pedigree breeding was used for analysis of agronomic and physicochemical traits. Genetic segregation was observed at the highest frequency among opaque endosperm mutants, being present in 85.7% (12/14 lines) of the entire opaque lines. However, the major agricultural characteristics and grain traits of \"S-21-3-8\" were similar to those of a donor cultivar, \"Ilpum\". \"S-21-3-8\" showed significantly lower (10.6%) amylose than those (17.7%) of \"Ilpum\" in brown rice, while the protein levels were similar to those of the donor plant. The grain hardness of \"S-21-3-8\" (1.67 kgf/mm2) was lower than that of \"Ilpum\" (1.97 kgf/mm2), resulting in a high flour-milling percentage. The loosely packed starch granules of \"S-21-3-8\" in the opaque endosperm were demonstrated by SEM analysis of cross-sectioned rice grains. The opaque endosperm mutants that were of somaclonal variations in the tissue culture will lead to improved eating quality and processing properties of rice.
Analysis of Genetic and Biogeography Diversity of Korean Indigenous Wild Rocambole (Allium monanthum Max)  [PDF]
Gihwan Yi, Kyung-Min Kim
American Journal of Plant Sciences (AJPS) , 2013, DOI: 10.4236/ajps.2013.45130
Abstract:

This study was conducted to obtain baseline data describing Allium monanthum Max. for breeding an elite cultivar. A. monanthum has recently become popular vegetable in Korea owing to its unique flavors and nutraceutical effects. The agronomic traits of 271 accessions of A. monanthum collected throughout Korea were evaluated in this study. Leaf width showed the greatest variation (0.1 to 25 mm) among traits evaluated, followed by leaf sheath length and number of cormlets. The average leaf sheath length and diameter, which are commonly used to evaluate quality in the market, were 1.29 cm and 0.3 cm. Some superior accessions had a leaf sheath length of >10 cm and diameter of >1.1 cm. The average weight of the cormlets ranged from 1 to 2 g; however, one accession weighed more than 4 g. The genetic diversity of A. monanthum calculated based on morphology and molecular distance was greater in Jeolla and Gyeoungsang provinces than Gyeonggi and Chungcheong provinces. Finally, seven elite accessions of A. monanthum were selected owing to their potential usefulness in future breeding projects.

Secure Cluster Head Sensor Elections Using Signal Strength Estimation and Ordered Transmissions
Gicheol Wang,Gihwan Cho
Sensors , 2009, DOI: 10.3390/s90604709
Abstract: In clustered sensor networks, electing CHs (Cluster Heads) in a secure manner is very important because they collect data from sensors and send the aggregated data to the sink. If a compromised node is elected as a CH, it can illegally acquire data from all the members and even send forged data to the sink. Nevertheless, most of the existing CH election schemes have not treated the problem of the secure CH election. Recently, random value based protocols have been proposed to resolve the secure CH election problem. However, these schemes cannot prevent an attacker from suppressing its contribution for the change of CH election result and from selectively forwarding its contribution for the disagreement of CH election result. In this paper, we propose a modified random value scheme to prevent these disturbances. Our scheme dynamically adjusts the forwarding order of contributions and discards a received contribution when its signal strength is lower than the specified level to prevent these malicious actions. The simulation results have shown that our scheme effectively prevents attackers from changing and splitting an agreement of CH election result. Also, they have shown that our scheme is relatively energy-efficient than other schemes.
A Secure Cluster Formation Scheme in Wireless Sensor Networks
Gicheol Wang,Dongkyun Kim,Gihwan Cho
International Journal of Distributed Sensor Networks , 2012, DOI: 10.1155/2012/301750
Abstract: In wireless sensor networks, clustering expedites many desirable functions such as load balancing, energy savings, and distributed key management. For secure clustering, it is very important to find compromised nodes and remove them during the initial cluster formation process. If some nodes are compromised and survive the censorship process, they can make some nodes have a different cluster view and can split a cluster into multiple clusters to deteriorate cluster quality as a whole. To resolve these problems, we propose a robust scheme against such attacks in this paper. First, our scheme generates large-sized clusters where any two nodes are at most two hops away from each other to raise the quality of clusters. Second, our scheme employs the verification of two-hop distant nodes to preserve the quality of the large-sized clusters and refrains from splitting the clusters. Last, our scheme prefers broadcast transmissions to save the energy of nodes. Security analysis proves that our scheme can identify compromised nodes and preserves the cluster membership agreement against the compromised nodes. In addition, simulation results prove that our scheme generates fewer clusters and is more secure and energy efficient than the scheme producing only small-sized clusters.
The True Value of a Sample Composition Is There  [PDF]
Hong Yi, Wei Yi
American Journal of Analytical Chemistry (AJAC) , 2015, DOI: 10.4236/ajac.2015.64027
Abstract: The core objective of a chemical composition measurement is to determine its true value. However, when measuring the composition of a macroscopic sample with a large number of atoms or molecules, realizing the true value of the measurand at both the macroscopic and microscopic levels remains an unsolved theoretical problem. We find that the true value of a sample composition exists in any subsample of a homogeneous molecular population of the sample. Here, we propose the Central Law of Measurement of the Amount of Substance: “The homogeneity of a sample molecular population represents the measurement accuracy of the sample composition in an analytical procedure”. The Central Law is based on a homogeneous molecular population axiom in which the molecular composition of a sample is identical for any homogeneous subsample. Furthermore, we point out that, at the microscopic scale, Avogadro’s law does not hold true.
Normality of Meromorphic Functions Family and Shared Set by One-way  [PDF]
Yi Li
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.13021
Abstract: We studied the normality criterion for families of meromorphic functions which related to One-way sharing set, and obtain two normal criterions, which improve the previous results.
Skyhook Surface Sliding Mode Control on Semi-Active Vehicle Suspension System for Ride Comfort Enhancement  [PDF]
Yi Chen
Engineering (ENG) , 2009, DOI: 10.4236/eng.2009.11004
Abstract: A skyhook surface sliding mode control method was proposed and applied to the control on the semi-active vehicle suspension system for its ride comfort enhancement. A two degree of freedom dynamic model of a vehicle semi-active suspension system was given, which focused on the passenger’s ride comfort perform-ance. A simulation with the given initial conditions has been devised in MATLAB/SIMULINK. The simula-tion results were showing that there was an enhanced level of ride comfort for the vehicle semi-active sus-pension system with the skyhook surface sliding mode controller.
A Dam Break Analysis Using HEC-RAS  [PDF]
Yi Xiong
Journal of Water Resource and Protection (JWARP) , 2011, DOI: 10.4236/jwarp.2011.36047
Abstract: This paper firstly described the dam break in the aspects of theories and models. Break parameters prediction, the understanding of dam break mechanics, peak outflow prediction were shown as the essential for the dam break analysis, and eventually determined the loss of the damages. Secondly, as an application example, Foster Joseph Sayers Dam break was further modeled and analyzed using USACE Hydrologic Engineering Center’s River Analysis System (HEC-RAS) model based on available geometry data. The results show that dam break is a complicated and comprehensive process involving lots of principles. Combination of mechanics and case studies, reflection of predominant mechanisms of headcut erosion, more specific categorization of dam, prudent investigation and inference of dam break process are needed in developing a satisfactory dam break simulation model. Foster Joseph Sayers Dam break due to piping elongates the time period of high water surface level, which increases the duration of risk. However, the dam break does not increase the downstream maximum water surface elevation (Max. W.S. Elev) significantly at previous design Probable Maximum Flood (PMF). Dam break has a greater impact on the downstream location where is closer to the dam in accordance with the comparison of the hydrographs at different downstream locations. Sensitivity analysis demonstrates that the changes of dam break parameters had no much influence on the downstream Max. W.S. Elev.
The Normal Meromorphic Functions Family Concerning Higher Order Derivative and Shared Set by One-Way  [PDF]
Yi Li
Advances in Pure Mathematics (APM) , 2011, DOI: 10.4236/apm.2011.16058
Abstract: Let F be a meromorphic functions family on the unit disc Δ, If for every (the zeros of f is a multiplicity of at least k) and if then and ( ), then F is normal on Δ.
Ben-Naim’s “Pitfall”: Don Quixote’s Windmill  [PDF]
Yi Fang
Open Journal of Biophysics (OJBIPHY) , 2013, DOI: 10.4236/ojbiphy.2013.31002
Abstract:

Ben-Naim in three articles dismissed and answered the Levinthals paradox. He announces there are pitfalls caused by the misinterpretation of thermodynamic hypothesis. He claims no existence of Gibbs free energy formula where the variable is a protein’s conformation X . His Gibbs energy functional is G(T, P, N, P(R)), where the variable is probability distributions P (R) of the conformations. His “minimum distribution Peq is wrong. By carefully establishing thermodynamic systems, we demonstrate how to apply quantum statistics to derive Gibbs free energy formula G(X). The formula of the folding force \"\" is given.

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