Showing papers by "Zheng Yan published in 2008"
01 Jan 2008
TL;DR: The authors hope that understanding the current challenges, solutions and their limitations of trust modeling and management will not only inform researchers of a better design for establishing a trustworthy system, but also assist in the understanding of the intricate concept of trust in a digital environment.
Abstract: This chapter introduces trust modeling and trust management as a means of managing trust in digital systems. Transforming from a social concept of trust to a digital concept, trust modeling and management help in designing and implementing a trustworthy digital system, especially in emerging distributed systems. Furthermore, the authors hope that understanding the current challenges, solutions and their limitations of trust modeling and management will not only inform researchers of a better design for establishing a trustworthy system, but also assist in the understanding of the intricate concept of trust in a digital environment.
134 citations
TL;DR: In this paper, a dual-band compact monopole antenna with CPW-fed structure is proposed for WLAN applications, which consists of an inverted-L strip and an open-ended rectangular ring strip, having a compact size of only 26.5 × 25 × 1.6 mm3 including the ground plane.
Abstract: A dual-band compact monopole antenna with CPW-fed structure is proposed for WLAN applications. The proposed antenna, which consists of an inverted-L strip and an open-ended rectangular ring strip, has a compact size of only 26.5 × 25 × 1.6 mm3 including the ground plane. Fabricated and measured, the proposed antenna covers both 2.4 GHz (2.4–2.484 GHz) and 5 GHz (5.15–5.825 GHz) bands and provides good radiation characteristics and antenna gains for the operating bands.
21 citations
23 Jun 2008
TL;DR: A trust model based on users' behaviors is proposed, which assists the evaluation and management of the mobile application's trust with user friendliness, and the practical significance of the work towards usable trust management.
Abstract: A mobile application is a software package that can be installed and executed in a mobile device. Which mobile application is more trustworthy for a user to purchase or install becomes a crucial issue that impacts its final success. This paper proposes a trust model based on users' behaviors, which assists the evaluation and management of the mobile application's trust with user friendliness. We achieve our model through exploratory factor analysis, reliability analysis and correlation analysis based on the data collected from a questionnaire survey. It is indicated that a user's trust behavior is a multidimensional construct composed of four aspects: usage behavior, reflection behavior, correlation behavior and management behavior. Particularly, the practical significance of our work towards usable trust management, the limitations of current empirical study and future work are also discussed.
17 citations
07 Jul 2008
TL;DR: A comprehensive trust model is presented in order to specify, evaluate and manage various trust relationships that exist among entities in a component software system and supports trust management based on trust evaluation both at component download time and runtime.
Abstract: The growing importance of component software introduces special requirements on trust due to the nature of applications they provide, in particular when the system supports dynamic component deployment. This paper presents a comprehensive trust model in order to specify, evaluate and manage various trust relationships that exist among entities in a component software system. It contains a sub-model to present trust relationships among system entities, a sub-model to specify the information related to trust management for a software component, a sub-model for trust evaluation and a sub-model for trust management. This trust model supports trust management based on trust evaluation both at component download time and runtime.
11 citations
TL;DR: In this article, a novel printed antenna having a frequency band-notched function for UWB applications is proposed and studied, with a pair of inverted C-shaped slots introduced around the microstrip line on the gr...
Abstract: A novel printed antenna having a frequency band-notched function for UWB applications is proposed and studied. With a pair of inverted C-shaped slots introduced around the microstrip line on the gr...
6 citations
Proceedings Article•
01 Jan 2008TL;DR: A DC voltage power supply for a time division multiple access (TDMA) radio system is provided and a capacitor is coupled to the voltage converter such that the capacitor is charged by theDC output voltage when the switching transistor is turned on and the capacitor holds the DC output voltage by discharging when the switch is turned off.
Abstract: A DC voltage power supply for a time division multiple access (TDMA) radio system is provided. The DC voltage power supply apparatus includes an AC signal source, a switching transistor, a controlling signal source, a voltage converter circuit, and a capacitor. The AC signal source provides an AC signal to the DC voltage power supply. The switching transistor is coupled to the clock for switching on and off the clock signal. The controlling signal source is coupled to the switching transistor for turning the switching transistor off during a transmission or reception period and for turning the switching transistor on during an idle period. The voltage converter circuit is coupled to the switching transistor and generates a DC output voltage from the AC signal. Finally, the capacitor is coupled to the voltage converter such that the capacitor is charged by the DC output voltage when the switching transistor is turned on and the capacitor holds the DC output voltage by discharging when the switch is turned off.
4 citations
TL;DR: In this paper, a novel printed wideband monopole antenna for multiband operations is presented, which can achieve good impedance matching in a wide dual-band can be achieved by a simple circular monopole and a rectangular conductor-backed plane with a square hole.
Abstract: A novel printed wideband monopole antenna for multiband operations is presented Good impedance matching in a wide dual-band can be achieved by a simple circular monopole and a rectangular conductor-backed plane with a square hole The measured 10 dB bandwidth for return loss is from 178 to 419 GHz about 80% and 512 to 635 GHz about 214% which covering all the 24/52/58 GHz WLAN, 25/35/55 GHz WiMAX, DCS (1710–1880 MHz), PCS (1850–1990 MHz), UMT (1920–2170 MHz), and IMT-2000 (1900–2025 MHz) bands applications Peak antenna gains have been obtained about 339 and 396 dBi for the lower and upper bands, respectively
2 citations
TL;DR: In this paper, a small printed antenna with subband rejection for ultrawideband (UWB) applications is described, where two notches are incorporated in the radiating structure of the antenna to act as a bandstop filter to reject the undesired subband within the whole bandwidth.
Abstract: A small printed antenna is described with subband rejection for ultrawideband (UWB) applications [1]. Two notches are incorporated in the radiating structure of the antenna to act as a bandstop filter to reject the undesired subband within the whole bandwidth [2]. The designed antenna features a compact size of 26×25 mm2, and satisfies the VSWR requirement of less than 2.0 in the frequency band from 3 GHz to more than 12 GHz excluding any undesired subband such as 4.65–5.65 GHz. Good monopole-like radiation patterns and antenna gains have also been obtained.