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Search Results: 1 - 10 of 120103 matches for " Yuhao Wang "
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Performance Study of Multi-Path in VANETs and Their Impact on Routing Protocols  [PDF]
Jing Wu, Yuhao Wang
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.23018
Abstract: Modeling complicated vehicular traffic behavior and analyzing effects on the communication performance of routing protocols taken by environmental factors have been a challenging task for the past several years. In this paper, we study the performance of multi-path routing protocol. Then, we investigate both multi-path and single-path routing protocol and analyze characteristics such as network connectivity, vehicle-node density etc. To better understand this phenomenon, we use mobility model with different parameters and evaluate the performance of routing protocols (Ad-hoc On-Demand Distance Vector and Ad-hoc On-demand Multipath Distance Vector routing protocols) through NS2 platform. The simulation results show the significance of multi-path on the throughput, loss and average delay of VANETs. The results of this paper may be used to study designing route protocols and applications of VANET.
Uniticket: A Third Party Universal E-Ticket System Based on Mobile Phone  [PDF]
Linli Hu, Yuhao Wang, Dong Li
Wireless Engineering and Technology (WET) , 2011, DOI: 10.4236/wet.2011.23023
Abstract: Prepaid energy meters have been widely adopted by utilities in different countries across the world as an innovative solution to the problem of affordability and consumption management. However, the present smart card based systems have some inherent problems like added cost, low availability and lack of security. In the future Smart Grid paradigm, use of smart meters can completely overhaul these prepaid systems by introducing centralized accounting, monitoring and credit-control functions using state-of-the-art telecommunication technologies like WiMAX. In this paper we propose a prepaid smart metering scheme for Smart Grid application based on centralized authentication and charging using the WiMAX prepaid accounting model. We then discuss its specific application to Demand Response and Roaming of Electrical Vehicles.
False Data Injection Attacks Detection in Power System Using Machine Learning Method  [PDF]
Can Yang, Yong Wang, Yuhao Zhou, Jiongming Ruan, Wei Liu
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.611025
Abstract: False data injection attacks (FIDAs) against state estimation in power system are a problem that could not be effectively solved by traditional methods. In this paper, we use four outlier detection methods, namely one-Class SVM, Robust covariance, Isolation forest and Local outlier factor method from machine learning area in IEEE14 simulation platform for test and compare their performance. The accuracy and precision were estimated through simulation to observe the classification effect.
Channel-Aware Bayesian Model for Reliable Environmental Monitoring Sensor Networks
Zhenghai Wang,Mao Tian,Yuhao Wang
Journal of Communications , 2011, DOI: 10.4304/jcm.6.5.355-359
Abstract: We provide a novel statistical-based approach to address the reliable data reception problem for environment monitoring sensor networks. In this paper, a channel-aware Bayesian model is designed to choose the most likely quantization level as the value of the monitored phenomenon at the sink node such that the probability of a correct decision is maximized. Simple methods are presented to formulate both the temporal correlation of the monitored phenomenon and the error information of the data transfer channel between the sensor node which monitors the phenomenon and the sink node as the prior input to this Bayesian device. Evaluation based on real sensor data shows that the proposed model can monitor physical phenomena much more accurately than channel-unaware algorithms.
The specific contribution of object’s origin on artifacts categorization
Yuhao Sun,Wang Zhe,Xiaolan Fu
Chinese Science Bulletin , 2006, DOI: 10.1007/s11434-006-2205-y
Abstract: Gelman and Bloom found that adults and children’s object naming was sensitive to how an object was created (man-made or not), but they did not reveal on which specific level of conceptual system this effect was. Using a free-naming task and a force-choice task, two experiments were conducted to test a hypothesis that this effect was specifically on domain level (“artifact/non-artifact” distinction). In Experiment 1, participants were asked to name shortly-depicted objects, rate their confidence, and report their reasons for each naming response. Results showed that most of the naming responses in “man-made” condition were in artifact domain, and most in “natural” condition were in non-artifact domain, although in both conditions names were very divergent on basic level. In Experiment 2, another group of participants were asked to choose one from two names (one in artifact domain and the other in non-artifact domain) to match the same shortly-depicted objects presented in the first experiment. Results of Experiment 1 on domain level were replicated in Experiment 2. These convergent findings supported the hypothesis that the effect of object’s origin is specifically on domain level of conceptual system of objects. Reasons explicitly reported for naming responses in Experiment 1 suggested that participants might automatically infer objects’ functions in “man-made” condition but not in “natural” condition. Here the function-based hypothesis of artifacts classification is discussed.
Naturally-formed objects categorized as artifacts: Effect of objects’ functional depictions
YuHao Sun,Zhe Wang,Ye Liu,XiaoLan Fu
Chinese Science Bulletin , 2010, DOI: 10.1007/s11434-010-0033-6
Abstract: Past research has identified a variety of factors that influence cognitive processing of artifact concepts, but few experiments tested possible interactive patterns among these factors. Using a natural language depiction based free naming task, we explored how an object’s function and its history (information about how an object was formed by natural force) interact to affect categorization judgment in a 2×2 between- subjects experiment (N = 169). The study had two key findings: (i) Without presenting an object’s function, presenting the history of its natural formation increased subjects’ tendency to name the object under the “natural” domain and decreased their tendency to name it under the “artifact” domain; (ii) once we presented the depiction of an object’s function, the effect of history presentation on categorization disappeared: Subjects in both conditions strongly preferred naming objects as artifacts. In summary, presenting depiction of an object’s function inhibited the effect of history on object categorization. Current findings suggest that an object’s function plays a fundamental role in the cognitive processing of artifact concepts.
The Role of External Auditors in Detecting and Reporting Corporate Fraud in Public Listed Companies in China
Yuhao Zhou
International Journal of Business Administration , 2012, DOI: 10.5430/ijba.v3n1p2
Abstract: With only 30 years development of Chinese capital market, especially the listed companies and audit profession, there are still some deficiencies compared to the UK which limits the role of external auditors. With the comparisons in the legal and regulatory framework governing external auditors and the responsibilities of external auditors in detecting and reporting corporate fraud between the UK and China, these differences can reflect some difficulties for Chinese auditors in detecting and reporting corporate fraud. Hence, semi-structured interviews are conducted to collect information about the practical difficulties in their audits of listed companies in detecting and reporting fraud in China. In order to strengthen the role of Chinese auditors in detecting and reporting corporate fraud, some recommendations are made finally.
The Case Analysis of the Scandal of Enron
Yuhao Li
International Journal of Business and Management , 2010, DOI: 10.5539/ijbm.v5n10p37
Abstract: The Enron scandal, revealed in October 2001, eventually led to the bankruptcy of the Enron Corporation, an American energy company based in Houston, Texas, and the dissolution of Arthur Andersen, which was one of the five largest audit and accountancy partnerships in the world. In addition to being the largest bankruptcy reorganization in American history at that time, Enron undoubtedly is the biggest audit failure. It is ever the most famous company in the world, but it also is one of companies which fell down too fast. In this paper, it analysis the reason for this event in detail including the management, conflict of interest and accounting fraud. Meanwhile, it makes analysis the moral responsibility From Individuals’ Angle and Corporation’s Angle.
Ultrathin MgB2 films fabricated on Al2O3 substrate by hybrid physical-chemical vapor deposition with high Tc and Jc
Yuhao Zhang,Zhiyuan Lin,Qian Dai,Dongyao Li,Yinbo Wang,Yan Zhang,Yue Wang,Qingrong Feng
Physics , 2011, DOI: 10.1088/0953-2048/24/1/015013
Abstract: Ultrathin MgB2 superconducting films with a thickness down to 7.5 nm are epitaxially grown on (0001) Al2O3 substrate by hybrid physical-chemical vapor deposition method. The films are phase-pure, oxidation-free and continuous. The 7.5 nm thin film shows a Tc(0) of 34 K, which is so far the highest Tc(0) reported in MgB2 with the same thickness. The critical current density of ultrathin MgB2 films below 10 nm is demonstrated for the first time as Jc ~ 10^6 A cm^{-2} for the above 7.5 nm sample at 16 K. Our results reveal the excellent superconducting properties of ultrathin MgB2 films with thicknesses between 7.5 and 40 nm on Al2O3 substrate.
55-Week Treatment of Mice with the Unani and Ayurvedic Medicine Pomegranate Flower Ameliorates Ageing-Associated Insulin Resistance and Skin Abnormalities
Jianwei Wang,Xianglu Rong,Irene S. I. Um,Johji Yamahara,Yuhao Li
Evidence-Based Complementary and Alternative Medicine , 2012, DOI: 10.1155/2012/350125
Abstract: PPARs play a pivotal role in regulating lipid and glucose homeostasis and are involved in diverse biological activities in skin. Pomegranate flower (PGF, an antidiabetic therapy in Unani and Ayurvedic medicines) has been previously demonstrated to activate both PPARalpha/gamma. Here, we found that treatment of mice with the diet containing PGF powder over 55 weeks attenuated ageing-induced abnormal increases in the homeostasis model assessment of insulin resistance, glucose concentrations during oral glucose tolerance test, and adipose insulin resistance index. The diet tended to decrease the excessive peri-ovary fat mass. It, however, increased the thinned subcutaneous fat thickness. In addition, the diet restored decreases in skin water content, epidermis thickness, and collagen density in corium. Thus, our results demonstrate that long-term treatment with the Unani and Ayurvedic therapy ameliorates ageing-induced insulin resistance, which is associated with reversal of ageing-induced fat redistribution. Further, PGF attenuates ageing-mediated undesirable skin abnormalities.
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