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Search Results: 1 - 10 of 25710 matches for " Ying Ying Chan "
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Enhancement of TiB Grain Refining Effect on A356 Gravity Die Casting with the Addition of Yttrium  [PDF]
Lim Ying Pio, Wang Chan Chin
Materials Sciences and Applications (MSA) , 2012, DOI: 10.4236/msa.2012.310104
Abstract: The present work investigates the effect yttrium on the grain refining efficiency of Al-5Ti-1B in gravity die cast A356 aluminum alloy. A series of casting experiments were carried out in which the Ti and B contents were maintained constantly at 0.1 and 0.02 wt% respectively. The inoculation level of yttrium was manipulated at the amount of 0, 0.1, 0.2, 0.3, 0.4 and 0.5 wt%. Microstructural characterization of the as-cast A356 alloy was investigated by means of optical microscope and its phases are detected by XRD. XRF is used to determine the contents of inoculating elements such as Ti, B and Y so that their actual optimal ratio in the casting can be approximated. The mechanical properties tested are tensile strength and hardness. The inoculation of yttrium was found to enhance the grain refinement effect of Al-5Ti-1B grain refiner and improve the mechanical properties. The optimal weight percentage of yttrium was discovered to be 0.3. The grain refining efficiency of combining yttrium and Al-5Ti-1B on A356 aluminum alloy was mainly attributed to the heterogeneous nucleation of TiB2 and TiAl3 particles which were dispersed more evenly in the presence of yttrium and also as a result of α-Al grain growth restriction by AlY3compound precipitated at grain boundaries during solidification.
Simulation of Ultra-slow Oscillations Using the Integrate and Fire Neuron Model  [PDF]
Danny Ng, MokSiew -Ying, Chan Siow -Cheng, Goh Sing -Yau
Engineering (ENG) , 2012, DOI: 10.4236/eng.2012.410B017
Abstract:

The Integrate and Fire (IF) neuron model wasusedto simulate ultra-slow oscillations that were observed in cortical cultures. Simulation of a network with 2 sub-networks is conducted in this study. We introduced an additional equation that governs the generation and dissipation of an inhibitory property to each of the sub-network.Sub-networks that fire at different rate are generated from the simulation. The network activity from the simulation oscillates at frequencies that are comparable to ultra-slow oscillations observed in cortical cultures.

Visual Checking of Spreadsheets
Ying Chen,Hock Chuan Chan
Computer Science , 2008,
Abstract: The difference between surface and deep structures of a spreadsheet is a major cause of difficulty in checking spreadsheets. After a brief survey of current methods of checking (or debugging) spreadsheets, new visual methods of showing the deep structures are presented. Illustrations are given on how these visual methods can be employed in various interactive local and global debugging strategies.
On the Degree of Freedom for Multi-Source Multi-Destination Wireless Network with Multi-layer Relays
Feng Liu,Chung Chan,Ying Jun,Zhang
Mathematics , 2011,
Abstract: Degree of freedom (DoF) region provides an approximation of capacity region in high signal-to-noise ratio (SNR) regime, while sum DoF gives the scaling factor. In this correspondence, we analyse the DoF region and sum DoF for unicast layered multi-hop relay wireless networks with arbitrary number of source/destination/relay nodes, arbitrary number of hops and arbitrary number of antennas at each node. The result is valid for quite a few message topologies. We reveal the limitation on capacity of multi-hop network due to the concatenation structure and show the similarity with capacitor network. From the analysis on bound gap and optimality condition, the ultimate capacity of multi-hop network is shown to be strictly inferior to that of single-hop network. Linear scaling law can be established when the number of hops is fixed. At cost of channel state information at transmitters (CSIT) for each component single-hop network, our achievable scheme avoids routing and simplifies scheduling.
Cross-Verification of As-Built Point Cloud and GIS-Related Map Data  [PDF]
Naai-Jung Shih, Shih-Cheng Tzen, Tzu-Ying Chan, Chia-Yu Lee
Open Journal of Civil Engineering (OJCE) , 2013, DOI: 10.4236/ojce.2013.34026
Abstract:

This study cross-validates existing urban maps using point cloud models to update GIS related data. The model, as-built 3D data, is created to integrate with maps in an architectural CAD platform. The clouds are referred by existing vector maps to verify inconsistency and to update 3D spatial relationships between subjects and environment. The cloud model shows its top reference hierarchy as the updated data for topographic-derived urban maps.

The Integrated 3D As-Built Representation of Underground MRT Construction Sites  [PDF]
Naai-Jung Shih, Chia-Yu Lee, Tzu-Ying Chan, Shih-Cheng Tzen
Journal of Building Construction and Planning Research (JBCPR) , 2013, DOI: 10.4236/jbcpr.2013.14016
Abstract: This study facilitates the scalability of as-built data from an earlier street level to underground transportation sites from the life-cycle perspective of urban information maintenance. As-built 3D scans of a 6 km street were made at different time periods, and of 3 underground Mass Rapid Transit (MRT) stations under construction in Taipei. A scanned point cloud was used to create a Building Information Modeling (BIM) Level of Development (LOD) 500 as-built point cloud model, with which topographic utility data were integrated and the model quality was investigated. The complex underground models of the transportation stations are proofed to be in correct relative locations to the street entrances on ground level. In the future the 3D relationship around the station will facilitate new designs or excavations in the neighborhood urban environment.
Effects of a Care Workshop on Caring Behaviors as Measured by Patients and Patient Satisfaction  [PDF]
Hui-Shan Chan, Hui-Ying Chu, Hsiang Yen, Li-Na Chou
Open Journal of Nursing (OJN) , 2015, DOI: 10.4236/ojn.2015.52010
Abstract: Caring is a central focus of nursing, and patient satisfaction is a critical indicator of nursing care quality. The aim of this study was to determine the effects that a care workshop exerted on nurse caring behaviors as perceived by patients and reflected by patient satisfaction. A quasi-experimental, pretest-posttest design without a control group was applied. The intervention consisted of several facets: 1) formal educational sessions twice a week for six weeks, 2) an angel-master mentorship activity, and 3) posts of exemplary caring behavior and stories. A demographic questionnaire, the Modified Nurse Caring Behaviors Inventory, and the Hartford Hospital Satisfaction Survey were used in this study. Descriptive statistics were analyzed to evaluate participant demographic characteristics. Paired t tests were used to determine the effects of a care workshop on nurse caring behaviors as perceived by patients and reflected by patient satisfaction. Of the 236 patients enrolled, 49.6% were women and 57.2% were admitted to medical-surgical units. Female patients rated nurse caring behaviors higher and reported greater patient satisfaction than did male patients on the pretest (p < 0.05) and 6-week posttest (p < 0.01). Patient with medical-surgical admissions rated nurse caring behaviors higher and reported greater patient satisfaction than patients with emergency admissions did on the pretest and 6-week posttest (p < 0.01). Nurse caring behaviors and patient satisfaction were positively correlated on the pretest (p < 0.05) and 6-week posttest (p < 0.01). Patient satisfaction scores increased after the intervention compared with the pretest scores (p = 0.000). Caring educational programs for nurses are commonly regarded to be an essential strategy for promoting care knowledge and practice and improving patient satisfaction. According to the favorable results of this study, care workshops must be provides to nurses in other units or hospitals in future studies.
IFITM Proteins Restrict Antibody-Dependent Enhancement of Dengue Virus Infection
Ying Kai Chan, I-Chueh Huang, Michael Farzan
PLOS ONE , 2012, DOI: 10.1371/journal.pone.0034508
Abstract: Interferon-inducible transmembrane (IFITM) proteins restrict the entry processes of several pathogenic viruses, including the flaviviruses West Nile virus and dengue virus (DENV). DENV infects cells directly or via antibody-dependent enhancement (ADE) in Fc-receptor-bearing cells, a process thought to contribute to severe disease in a secondary infection. Here we investigated whether ADE-mediated DENV infection bypasses IFITM-mediated restriction or whether IFITM proteins can be protective in a secondary infection. We observed that IFITM proteins restricted ADE-mediated and direct infection with comparable efficiencies in a myelogenous leukemia cell line. Our data suggest that IFITM proteins can contribute to control of secondary DENV infections.
Fine Resolution Air Quality Monitoring from a Small Satellite: CHRIS/PROBA
Janet E. Nichol,Man Sing Wong,Yuk Ying Chan
Sensors , 2008, DOI: 10.3390/s8127581
Abstract: Current remote sensing techniques fail to address the task of air quality monitoring over complex regions where multiple pollution sources produce high spatial variability. This is due to a lack of suitable satellite-sensor combinations and appropriate aerosol optical thickness (AOT) retrieval algorithms. The new generation of small satellites, with their lower costs and greater flexibility has the potential to address this problem, with customised platform-sensor combinations dedicated to monitoring single complex regions or mega-cities. This paper demonstrates the ability of the European Space Agency’s small satellite sensor CHRIS/PROBA to provide reliable AOT estimates at a spatially detailed level over Hong Kong, using a modified version of the dense dark vegetation (DDV) algorithm devised for MODIS. Since CHRIS has no middle-IR band such as the MODIS 2,100 nm band which is transparent to fine aerosols, the longest waveband of CHRIS, the 1,019 nm band was used to approximate surface reflectance, by the subtraction of an offset derived from synchronous field reflectance spectra. Aerosol reflectance in the blue and red bands was then obtained from the strong empirical relationship observed between the CHRIS 1,019 nm, and the blue and red bands respectively. AOT retrievals for three different dates were shown to be reliable, when compared with AERONET and Microtops II sunphotometers, and a Lidar, as well as air quality data at ground stations. The AOT images exhibited considerable spatial variability over the 11 x 11km image area and were able to indicate both local and long distance sources.
Excess healthcare burden during 1918-1920 influenza pandemic in Taiwan: implications for post-pandemic preparedness
Ying-Hen Hsieh, Chi-Ho Chan
BMC Public Health , 2011, DOI: 10.1186/1471-2458-11-41
Abstract: To establish the healthcare needs after the initial wave in 1918, the yearly healthcare records (hospitalizations, outpatients, etc.) in Taiwan during 1918-1920 are compared with the corresponding data from the adjacent "baseline" years of 1916, 1917, 1921, and 1922 to estimate the excess healthcare burden during the initial outbreak in 1918 and in the years immediately after.In 1918 the number of public hospital outpatients exceeded the yearly average of the baseline years by 20.11% (95% CI: 16.43, 25.90), and the number of hospitalizations exceeded the corresponding yearly average of the baseline years by 12.20% (10.59, 14.38), while the excess number of patients treated by the public medics was statistically significant at 32.21% (28.48, 39.82) more than the yearly average of the baseline years. For 1920, only the excess number of hospitalizations was statistically significant at 19.83% (95% CI: 17.21, 23.38) more than the yearly average of the baseline years.Considerable extra burden with significant loss of lives was reported in 1918 by both the public medics system and the public hospitals. In comparison, only a substantial number of excess hospitalizations in the public hospitals was reported in 1920, indicating that the population was relatively unprepared for the first wave in 1918 and did not fully utilize the public hospitals. Moreover, comparatively low mortality was reported by the public hospitals and the public medics during the second wave in 1920 even though significantly more patients were hospitalized, suggesting that there had been substantially less fatal illnesses among the hospitalized patients during the second wave. Our results provide viable parameters for assessing healthcare needs for post-pandemic preparedness.The 2009 pandemic H1N1 (pH1N1) virus spread swiftly to all parts of the world in a matter of a few months after it was first identified in Mexico in March. In August 2010, World Health Organization (WHO) declared the world to be in
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