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Search Results: 1 - 10 of 14272 matches for " Hung-Der Jang "
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Antifungal Activities of Commercial Rice Wine Extracts of Taiwanese Allium fistulosum  [PDF]
Tsan-Chang Chang, Hung-Der Jang, Wang-De Lin, Peng-Fu Duan
Advances in Microbiology (AiM) , 2016, DOI: 10.4236/aim.2016.67046
Abstract: Antifungal activities of the commercial rice wine extracts of Allium fistulosum were analyzed. Antifungal activities were tested against 7 pathogenic fungi by using agar disc diffusion and tube dilution tests. The results show that the commercial rice wine extracts of Allium fistulosum have strong antifungal activity against Aspergillus brasiliensis ATCC 16404, Candida albicans ATCC 10231, Microsporumcanis ATCC 36299, M. gypseum ATCC 24102, Trichophyton mentagrophytes ATCC 9533, T. rubrum ATCC 28188, and T. tonsurans ATCC 28942. The commercial rice wine extracts of different A. fistulosum parts were found to exhibit significant antifungal activities with the minimal inhibitory concentration (MIC) in the range of 0.2 - 1.0 mg/mL. The antifungal activity of the extracts of different A. fistulosum parts was in the order of AFS
A Comparative Study on the Total Antioxidant and Antimicrobial Potentials of Ethanolic Extracts from Various Organ Tissues of Allium spp.  [PDF]
Tsan-Chang Chang, Hui-Ting Chang, Shang-Tzen Chang, Sun-Fa Lin, Yi-Huang Chang, Hung-Der Jang
Food and Nutrition Sciences (FNS) , 2013, DOI: 10.4236/fns.2013.48A022
Abstract:

The extracts from different tissues of Allium fistulosum L. and Allium sativum L. were investigated to evaluate their antioxidant and antimicrobial capacity. The highest yields of the Allium extracts were prepared from the extraction of 30% ethanol solution. The DPPH scavenging activity was the highest in A. fistulosum L. leaves, which IC50 is 14.61 μg·mL-1. The highest antioxidant activity using TEAC assay and total phenolic content were observed in A. sativum L. stems and A. fistulosum L. stems, where they are determined to be 15.51 mMand 191.04 mg GAE·g-14.59 mMand 182.60 mg GAE·g-1,respectively. Statistic analysis revealed that the DPPH IC50 value was significantly correlated with total phenolic contents and antioxidant activity using TEAC assay. The extracts of A. sativum L. bulbs were found to exhibit antimicrobial activity against Staphylococcus aureus with the MIC and MBC of 0.2 mg·mL-1and 0.4 mg·mL-1, respectively. In addition, the extract of A. fistulosum L. stems was more active against Bacillus subtilis, with an MIC and MBC of 0.2 and 0.4 mg·mL-1, respectively. The inhibitory activity of various Allium extracts against the test bacteria was greater than that of 10 μg·mL-1 allicin. The results indicated that Allium spp. extracts could be used as a potential source of natural antioxidants and antimicrobial agents.

Synthesis and characterization of polyimides containing 4,4'-hexafluoroisopropylidene-bisphthalic
Hung, Daniel Liu Chun;Ho, Tong-Ing;Liaw, Der-Jang;Liaw, Been-Yang;
Polímeros , 1999, DOI: 10.1590/S0104-14281999000400013
Abstract: this paper presents the synthesis and characterization of polyimides, which contain a 4,4'-hexafluoroisopropylidene-bisphthalic anhydride (6fda) unit in the backbone. these polyimides are a result of the use of the traditional method of "one step". the reactions occur between equimolar of a dianhydride and an aromatic diamine in presence of the solvent dimethylacetamide (dmac), then cyclo-dehydrided by adding the acetic anhydride and pyridine. in this work, the 6fda was used as the dianhydride and four different diamines were investigated: 3,3',5,5'-tetramethyl-2,2- bis[4-( 4-aminophenoxy) phenyl] propane; 2,2-bis[4-(4-aminophenoxy)-phenyl] hexafluoropropane; 1,3-bis(4-aminophenoxy)benzene and 2,2'-dimethyl-4,4'-bis(4-aminophenoxy)biphenyl. the four polyimides (pa, pb, pc and pd) were characterized by tensile strength, infrared, inherent viscosity, differential scanning calorimeter (dsc) to get the glassy transition temperature (tg) and gel permeation chromatograph (gpc) to obtain the average molecular weight (mn).
Synthesis and characterization of polyimides containing 4,4'-hexafluoroisopropylidene-bisphthalic
Hung Daniel Liu Chun,Ho Tong-Ing,Liaw Der-Jang,Liaw Been-Yang
Polímeros , 1999,
Abstract: This paper presents the synthesis and characterization of polyimides, which contain a 4,4'-hexafluoroisopropylidene-bisphthalic anhydride (6FDA) unit in the backbone. These polyimides are a result of the use of the traditional method of "one step". The reactions occur between equimolar of a dianhydride and an aromatic diamine in presence of the solvent dimethylacetamide (DMAc), then cyclo-dehydrided by adding the acetic anhydride and pyridine. In this work, the 6FDA was used as the dianhydride and four different diamines were investigated: 3,3',5,5'-Tetramethyl-2,2- bis[4-( 4-aminophenoxy) phenyl] propane; 2,2-bis[4-(4-aminophenoxy)-phenyl] hexafluoropropane; 1,3-bis(4-aminophenoxy)benzene and 2,2'-dimethyl-4,4'-bis(4-aminophenoxy)biphenyl. The four polyimides (PA, PB, PC and PD) were characterized by tensile strength, infrared, inherent viscosity, Differential Scanning Calorimeter (DSC) to get the glassy transition temperature (Tg) and Gel Permeation Chromatograph (GPC) to obtain the average molecular weight (Mn).
Applications of Geometric Algorithms to Reduce Interference in Wireless Mesh Network
Hung-Chin Jang
International Journal on Applications of Graph Theory in Wireless ad hoc Networks and Sensor Networks , 2010,
Abstract: In wireless mesh networks such as WLAN (IEEE 802.11s) or WMAN (IEEE 802.11), each node should helpto relay packets of neighboring nodes toward gateway using multi-hop routing mechanisms. Wireless meshnetworks usually intensively deploy mesh nodes to deal with the problem of dead spot communication.However, the higher density of nodes deployed, the higher radio interference occurred. This causessignificant degradation of system performance. In this paper, we first convert network problems intogeometry problems in graph theory, and then solve the interference problem by geometric algorithms. Wefirst define line intersection in a graph to reflect radio interference problem in a wireless mesh network. Wethen use plan sweep algorithm to find intersection lines, if any; employ Voronoi diagram algorithm todelimit the regions among nodes; use Delaunay Triangulation algorithm to reconstruct the graph in orderto minimize the interference among nodes. Finally, we use standard deviation to prune off those longerlinks (higher interference links) to have a further enhancement. The proposed hybrid solution is proved tobe able to significantly reduce interference in a wireless mesh network in O(n log n) time complexity.
Applications of Geometric Algorithms to Reduce Interference in Wireless Mesh Network
Hung-Chin Jang
Computer Science , 2010, DOI: 10.5121/jgraphhoc.2010.2106
Abstract: In wireless mesh networks such as WLAN (IEEE 802.11s) or WMAN (IEEE 802.11), each node should help to relay packets of neighboring nodes toward gateway using multi-hop routing mechanisms. Wireless mesh networks usually intensively deploy mesh nodes to deal with the problem of dead spot communication. However, the higher density of nodes deployed, the higher radio interference occurred. This causes significant degradation of system performance. In this paper, we first convert network problems into geometry problems in graph theory, and then solve the interference problem by geometric algorithms. We first define line intersection in a graph to reflect radio interference problem in a wireless mesh network. We then use plan sweep algorithm to find intersection lines, if any; employ Voronoi diagram algorithm to delimit the regions among nodes; use Delaunay Triangulation algorithm to reconstruct the graph in order to minimize the interference among nodes. Finally, we use standard deviation to prune off those longer links (higher interference links) to have a further enhancement. The proposed hybrid solution is proved to be able to significantly reduce interference in a wireless mesh network in O(n log n) time complexity.
Gut Microbiota: Physiology and Relationship with Inflammatory Bowel Disease  [PDF]
Chun-Yu Lin, Yeong-Jang Lin, Hung-An Chen
Open Journal of Endocrine and Metabolic Diseases (OJEMD) , 2013, DOI: 10.4236/ojemd.2013.37039
Abstract:

The intestinal microbiota, which evolved over tens of thousands of years along with their human hosts, constitutes a complex and diverse ecosystem whose composition differs from person to person. Accumulating evidence indicates that commensal bacteria exert numerous beneficial physiological effects for humans, including nutrition, protection, metabolism, organ development and immunomodulation. However, mucosal immune responses to intestinal microflora require precise control to allow appropriate defense against potential pathogens but restrict the immune response to beneficial resident bacteria. The task of intestinal homeostasis is accomplished by epithelium and specialized immune system in the gastrointestinal tract. Alternation in the composition of the bacterial community, consisting of increased representation of harmful species or under presence of protective species, or dysbiosis has been linked to various chronic and inflammatory disorders, such as inflammatory bowel disease. An improved understanding of the underlying molecular mechanisms of host-microorganism interactions could bring new insights into onset and pathogenesis of several autoimmune diseases. This review will discuss physiologic properties of commensal microbiota and how dysregulated immune responses to them contribute to chronic mucosal inflammation.

Effective Bandwidth Allocation for WiMAX Mesh Network
Hung-Chin Jang,Wei-Ching Lin
Journal of Systemics, Cybernetics and Informatics , 2010,
Abstract: The aim of this paper is to reduce the media access delay in a WiMAX mesh network. We observe that as the number of subscriber stations (SS) in a neighborhood increases, the processes of transmission opportunity (TO) competition and 3- way handshake are easy to fail. This may degrade transmission efficiency and increase packet transmission delay. Besides, the minislot allocation defined in the WiMAX mesh mode may cause many lower priority services reserve earlier minislots than that of higher priority services like rtPS. This may cause great negative impact on delay-sensitive traffic. In this paper, we design a QoS classifier to enqueue packets according to different QoS service classes, present a dynamic holdoff exponent mechanism to reduce control subframe delay, and propose a Neighborhood-Based Minislot Allocation (NBMA) mechanism to reduce data subframe delay. Simulations show that the proposed methodology outperforms that of IEEE 802.16 and Baye's DynExp in delay, jitter and throughput.
Lack of Mitochondrial DNA Sequence Divergence between Two Subspecies of the Siberian Weasel from Korea: Mustela sibirica coreanus from the Korean Peninsula and M. s. quelpartis from Jeju Island
Hung Sun Koh,Kyung Hee Jang,Jang Geun Oh,Eui Dong Han
Animal Systematics, Evolution and Diversity , 2012, DOI: http://dx.doi.org/10.5635/ased.2012.28.2.133
Abstract: The objective of this study was to determine the degree of mitochondrial DNA (mtDNA) divergence between two subspecies of Mustela sibirica from Korea (M. s. coreanus on the Korean Peninsula and M. s. quelpartis on Jeju Island) and to examine the taxonomic status of M. s. quelpartis. Thus, we obtained complete sequences of mtDNA cytochrome b gene (1,140 bp) from the two subspecies, and these sequences were compared to a corresponding haplotype of M. s. coreanus, downloaded from GenBank. From this analysis, it was observed that the sequences from monogenic M. s. quelpartis on Jeju Island were identical to the sequences of four M. s. coreanus from four locations across the Korean Peninsula, and that the two subspecies formed a single clade; the average nucleotide distance between the two subspecies was 0.26% (range, 0.00 to 0.53%). We found that the subspecies quelpartis is not genetically distinct from the subspecies coreanus, and that this cytochrome b sequencing result does not support the current classification, distinguishing these two subspecies by pelage color. Further systematic analyses using morphometric characters and other DNA markers are necessary to confirm the taxonomic status of M. s. quelpartis.
A Quantity Model for Controlling and Measuring Software Quality Based on the Expert Decision-Making Algorithm  [PDF]
Che-Wei CHANG, Der-Juinn HORNG, Hung-Lung LIN
Intelligent Information Management (IIM) , 2009, DOI: 10.4236/iim.2009.12013
Abstract: Researchers have been active in the field of software engineering measurement over more than 30 years. The software quality product is becoming increasingly important in the computerized society. Target setting in software quality function and usability deployment are essential since they are directly related to development of high quality products with high customer satisfaction. Software quality can be measured as the degree to which a particular software program complies with consumer demand regarding function and characteristics. Target setting is usually subjective in practice, which is unscientific. Therefore, this study proposes a quantity model for controlling and measuring software quality via the expert decision-making algorithm-based method for constructing an evaluation method can provide software in relation to users and purchasers, thus enabling administrators or decision makers to identify the most appropriate software quality. Importantly, the proposed model can provide s users and purchasers a reference material, making it highly applicable for academic and government purposes.
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