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Search Results: 1 - 10 of 90877 matches for " YU Hong "
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Reliability Improvement Strategies for HVDC Transmission System  [PDF]
Yidong Hong, Tao Yu
Energy and Power Engineering (EPE) , 2013, DOI: 10.4236/epe.2013.53B011
Abstract:

This paper analyses reliability data of HVDC systems of Southern China Power Grid. The weak links of HVDC systems’ operational reliability are DC control and protection, valve hall and valve cooling system and transmission lines. Some improvement measures and HVDC system reliability technology are proposed in this paper.

 

Red or Blue? The Influence of Background Color on Promotion Value Perception  [PDF]
Yanxin Yu, Hong Zhou
American Journal of Industrial and Business Management (AJIBM) , 2018, DOI: 10.4236/ajibm.2018.83041
Abstract: Promotions are commonly used marketing tools for enterprises; the effectiveness of promotional posters is related to the success or failure of promotional activities. This paper embarks from two major elements of poster-promotional information and background color, and studies the effects of different promotional frames and background colors on the perceived value of consumer activity. This study divides the promotional framework into positive promotional framework and negative promotion framework. Through two experiments, the paper discusses how the matching of promotional frame and background color affects consumers value perception of promotional activities, and studies the mediating effect of perceptual diagnosis on the relationship, and the moderating effect of individual control sense on the relationship. The conclusion of the experiment is that the match between the promotional frame and the background color has an interactive effect on the value perception of the promotional activities. The experiment second verifies the existence of this interaction effect and verifies the mediating effect of perceptual diagnostics.
A Multiple Access Protocol for Multimedia Transmission over Wireless Networks
Hong Yu
Computer Science , 2012,
Abstract: This paper develops and evaluates the performance of an advanced multiple access protocol for transmission of full complement of multimedia signals consisting of various combinations of voice, video, data, text and images over wireless networks. The protocol is called Advanced Multiple Access Protocol for Multimedia Transmission (AMAPMT) and is to be used in the Data Link Layer of the protocol stack. The principle of operation of the protocol is presented in a number of logical flow charts. The protocol grants permission to transmit to a source on the basis of a priority scheme that takes into account a time-to-live (TTL) parameter of all the transactions, selectable priorities assigned to all the sources and relevant channel state information (CSI) in this order. Performance of the protocol is evaluated in terms of quality of service parameters like packet loss ratio (PLR), mean packet transfer delay (MPTD) and throughput. Using a simulation model based on an OPNET simulation software package does the evaluation. Under various traffic loads with constant distributions with various mean arrival rates and transaction sizes results obtained show that the performance is improved when this priority scheme is used than when it is not used. The results for AMAPMT are compared with that of the best currently available multiple access protocol called Adaptive Request Channel Multiple Access (ARCMA). AMAPMT protocol out performs ARCMA protocol.
Experimental Research and Finite Element Analysis on Setting Stiffening Rib of Corner Joints in Gabled Frames  [PDF]
Jin Cheng, Zuoquan Hong, Yu Wang
World Journal of Engineering and Technology (WJET) , 2016, DOI: 10.4236/wjet.2016.43C003
Abstract:
In order to clear constructional design of corner joint, it is necessary to further investi-gate mechanical property of corner joint in gabled frames. Through static test and finite element software analysis of comparing the panel zone with and without inclined stiffener. Some conclusions are given in the article. The load displacement curves show that the capacity of oblique nodes installed within stiffening rib components is enhanced i.e. 40% more than those without stiffening rib nodes. The results reveal that in the gabled frames, the corner node with the inclined stiffening rib can improve the bearing capacity of the specimens. When the extraterritorial flange is tension, the erection of the inclined stiffening rib can prevent structural failure and improve effectually the ductility of the structure.
Facing the Enemy Head-On: The Role of Pasimba Radio Program in Promoting the Fight against HIV and AIDS in Malawi  [PDF]
Precious Madula, Yu Hong, Wellman Kondowe
Advances in Journalism and Communication (AJC) , 2017, DOI: 10.4236/ajc.2017.54016
Abstract: Radio programs are very important in developing countries in informing the masses about public health matters. Their role is quite visible in the fight against HIV/AIDS through dissemination of messages aimed at informing the publics about the dangers of HIV/AIDS and what prevention measures can be employed. Drawing on framing and social learning theory together with readings on media effects, this study aimed at establishing whether Pasimba radio program is having an impact in promoting behavioral change among couples in Malawi. Data was collected through a survey (N = 100) and data was analyzed using cross tabulations, chi-square, correlation and regression. Results indicate that there is a significant relationship between respondents who listen to the program and those that have the propensity to undergo HIV test. This implies that Pasimba program is having an impact in influencing behavioral change and that there is a correlation between listening to the program and having the motivation to know one’s serostatus.
Effects on Strengths of Cement Mortar When Using Incinerator Bottom Ash as Fine Aggregate  [PDF]
Min-Jen Yang, Hong-Yu Wang, Hong-Yu Wang
World Journal of Engineering and Technology (WJET) , 2014, DOI: 10.4236/wjet.2014.23B007
Abstract:

The main purpose of this paper is to study the feasibility of using the Incinerator bottom ash fine aggregate to replace natural fine aggregate in the cement mortar products. The research adopts high cement content mortar to conduct the experiment, in which the weight ratio of cement/aggregate is 1/2. The experiment uses Incinerator bottom ash fine aggregates, which passes through #16 sieve, and natural sand of the same size as the aggregate, and separates mortar specimens in- to two main categories based on different W/C ratio. Moreover, different proportions of furnace slag and F-class are used to replace a portion of cement so as to explore the influence on strength of Incinerator bottom ash aggregates mortar by adding the two admixtures. The study shows that, based on the 1:2 cement/aggregate weight ratio, Incinerator bottom ash fine aggregates mortar, unit weight around 1.8 g/cm3, is 20% lighter natural fine aggregate mortar, unit weight around 2.2 g/cm3. The Incinerator bottom ash fine aggregates mortar can only reach 60%-70% the compressive strength of natural fine aggregates mortar. Direct tensile strength and flexural tensile strength tests are 15% and 30% of compressive strength respectively, due to the irregular strength development, which does not follow general concepts, such as low W/C ratio and mineral admixtures will not necessarily help in strength development in Incinerator bottom ash fine aggregates mortar.

A First-Principle Study of B- and P-Doped Silicon Quantum Dots
Jieqiong Zeng,Hong Yu
Journal of Nanomaterials , 2012, DOI: 10.1155/2012/147169
Abstract: Doping of silicon quantum dots (Si QDs) is important for realizing the potential applications of Si QDs in the fields of Si QDs-based all-Si tandem solar cells, thin-film transistors, and optoelectronic devices. Based on the first-principle calculations, structural and electronic properties of hydrogen terminated Si QDs doped with single Boron (B) or phosphorus (P) are investigated. It is found out that the structural distortion induced by impurity doping is related to the impurity characteristic, impurity position, and the QD size according to the structural analysis. The relative energetic stability of Si QDs with a single impurity in different locations has been discussed, too Furthermore, our calculations of the band structure and electronic densities of state (DOS) associated with the considered Si QDs show that impurity doping will introduce impurity states within the energy gap, and spin split occurs for some configurations. A detailed analysis of the influences of impurity position and QD size on the impurity levels has been made, too.
Figure Text Extraction in Biomedical Literature
Daehyun Kim,Hong Yu
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0015338
Abstract: Figures are ubiquitous in biomedical full-text articles, and they represent important biomedical knowledge. However, the sheer volume of biomedical publications has made it necessary to develop computational approaches for accessing figures. Therefore, we are developing the Biomedical Figure Search engine (http://figuresearch.askHERMES.org) to allow bioscientists to access figures efficiently. Since text frequently appears in figures, automatically extracting such text may assist the task of mining information from figures. Little research, however, has been conducted exploring text extraction from biomedical figures.
Mutation and Selection on the Wobble Nucleotide in tRNA Anticodons in Marine Bivalve Mitochondrial Genomes
Hong Yu,Qi Li
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0016147
Abstract: Animal mitochondrial genomes typically encode one tRNA for each synonymous codon family, so that each tRNA anticodon essentially has to wobble to recognize two or four synonymous codons. Several factors have been hypothesized to determine the nucleotide at the wobble site of a tRNA anticodon in mitochondrial genomes, such as the codon-anticodon adaptation hypothesis, the wobble versatility hypothesis, the translation initiation and elongation conflict hypothesis, and the wobble cost hypothesis.
Effects of arsenic trioxide on expressions of vascular endothelial growth factor and P-glycoprotein in multidrug resistant leukemia cell line K562/A02
Hong LIANG,Yu ZHANG
Zhong Xi Yi Jie He Xue Bao , 2007,
Abstract: Objective: To investigate the effects of arsenic trioxide (ATO) on the expressions of vascular endothelial growth factor (VEGF) and P-glycoprotein (P-gp) in K562/A02 cells and to explore the correlation between VEGF and P-gp.Methods: The inhibition rate of K562/A02 cell proliferation was detected by using methyl thiazolyl tetrazolium assay (MTT); the level of VEGF was detected by enzyme-linked immunosorbent assay (ELISA) and the expression rate of P-gp was determined by flow cytometry (FCM).Results: 0.05 μmol/L ATO had no influences on the cell proliferation and the expression of VEGF in K562/A02 cells; 0.4 and 3.2 μmol/L ATO could significantly inhibit the K562/A02 cell proliferation and down-regulate the expression of VEGF in K562/A02 cells (P<0.05). The expression of P-gp did not changed after being exposed to 0.05 and 0.4 μmol/L ATO for 24, 48 and 72 hours (P>0.05). 3.2 μmol/L ATO could remarkably reduce the expression of P-gp in K562/A02 cells after 48- and 72-hour incubation with ATO (P<0.05).Conclusions: The down-regulation of P-gp and VEGF after being exposed to ATO probably contributes to the reversion of multidrug resistance in K562/A02 cells. The level of VEGF may be related to the expression rate of P-gp in K562/A02 cells
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