IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science, 2005
Summary form only given. Using a fixed ion background to focus on the electron physics, an invest... more Summary form only given. Using a fixed ion background to focus on the electron physics, an investigation is conducted to examine the heating mechanisms of the electrons using PIC simulation. The simulation is compared to theory. The pressure dependence of collision frequency depends upon the heating mechanism: ohmic heating results in a collision frequency proportional to pressure, and stochastic heating
MILCOM 2009 - 2009 IEEE Military Communications Conference, 2009
This paper presents ViFiTM, a V-band wireless local area network (WLAN) that utilizes the unlicen... more This paper presents ViFiTM, a V-band wireless local area network (WLAN) that utilizes the unlicensed V-band spectrum while resolving the propagation challenges at V-band. ViFiTM allows for utilization of existing compatible waveforms, such 802.11g and ultra-wide band (UWB), and provides anti-shadowing capability to provide mobility throughout the network coverage area. In addition, three main applications for ViFiTM are discussed in
2009 Systems and Information Engineering Design Symposium, 2009
Abstract—A renewable hybrid power generation system is proposed. The motivation for the system is... more Abstract—A renewable hybrid power generation system is proposed. The motivation for the system is that grid power is often unreliable, limited or even nonexistent remote/rural areas such as forward operating bases and schools and hospitals in developing countries. The challenge of this ...
Abstract The Langmuir-Blodgett (LB) films of conducting poly( p -phenylenevinylene) (PPV) were pr... more Abstract The Langmuir-Blodgett (LB) films of conducting poly( p -phenylenevinylene) (PPV) were prepared by thermal treatment (250°C, 1 Torr) of the LB film of the PPV precursor, amphiphilic poly( p -xylylene-σ-diethylsulphonium) salt with perfluorononanoate counterion. The formation of the π-conjugated PPV structure varied with the thermal annealing time and was studied by means of UV spectroscopy. The elimination of the sulphide and fluorinated fatty acid during the thermal treatment was determined quantitatively by X-ray photoelectron spectroscopy. Both results indicated that extension of the π-conjugated structure could be realized and conversion from the PPV precursor to PPV could be completed within 10 min under these conditions. Furthermore, transmission electron microscopy examination revealed a gradual change in the surface image from heterogeneous to homogeneous during the thermal treatment, which indicated that a smooth surface of the PPV LB film was gradually formed by the thermal conversion.
This paper presents a model of language processing where word segmentation is an integral part of... more This paper presents a model of language processing where word segmentation is an integral part of sentence analysis. We show that the use of a parser can enable us to achieve the best ambiguity resolution in word segmentation. The lexical component of this model resolves most of the ambiguities, but the final disambiguation takes place in the parsing process. In this model, word segmentation is a by-product of sentence analysis, where the correct segmentation is represented by the leaves of a parse tree. We also show that the complexity usually associated with the use of a parser in segmentation can be reduced dramatically by using a dictionary that contains useful information on word segmentation. With the aid of such information, the sentence analysis process is reasonably fast and does not suffer from the problems other people have encountered. The model is implemented in NLPWin, the general-purpose language understanding system developed at Microsoft Research. A demo of the syst...
... There are several minimum MAE within the search area. The as-sumption of these fast algorithm... more ... There are several minimum MAE within the search area. The as-sumption of these fast algorithms does not hold. In Chow and Liou's work, it points out that these algorithms may be trapped by number of local minimum[6]. Since fast algorithms find the motion vector with local ...
The structure and phase transformations in the near-surface layers of a low carbon steel (0.2 wt.... more The structure and phase transformations in the near-surface layers of a low carbon steel (0.2 wt.% C) subjected to a high-current pulsed electron beam (HCPEB) treatments have been investigated by using electron microscopy and X-ray diffraction (XRD). The high-current electron beam is characterized by low energy (20–30 keV), short pulse (3.5 μs), and high energy density (1.5–4 J cm−2). A
... Point defects agglomerate to form wavy and blurred boundaries parallel to the surface. ... Fi... more ... Point defects agglomerate to form wavy and blurred boundaries parallel to the surface. ... Fig. 6. Near-surface cross-section TEM bright-field image, revealing several waving and blurredboundaries. Parts of the boundaries coincide with dislocations. View Within Article. ...
American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 1998
Radiative heat transfer in a system of packed particles is important for numerous industrial proc... more Radiative heat transfer in a system of packed particles is important for numerous industrial processes. Most of the existing numerical work have focused on specular spheres. There has been relatively less numerical work on a packing of diffuse spheres. There are some numerical studies on diffuse spheres, but their foci were not on the adequacy of the Monte-Carlo ray-tracing scheme. This study examines this issue and presents a modified ray-tracing scheme in which multiple rays are utilized. The results show this scheme to be more accurate for certain porous medium.
This paper presents a decoupled optimization technique for design of switching regulators using g... more This paper presents a decoupled optimization technique for design of switching regulators using genetic algorithms (GA). The optimization entails selection of the component values in the regulator to meet some static and dynamic requirements. During the optimization, a regulator is decoupled into two parts, including the power conversion stage (PCS) and the feedback network (FN). The PCS is optimized with
IEEE Conference Record - Abstracts. 2005 IEEE International Conference on Plasma Science, 2005
Summary form only given. Using a fixed ion background to focus on the electron physics, an invest... more Summary form only given. Using a fixed ion background to focus on the electron physics, an investigation is conducted to examine the heating mechanisms of the electrons using PIC simulation. The simulation is compared to theory. The pressure dependence of collision frequency depends upon the heating mechanism: ohmic heating results in a collision frequency proportional to pressure, and stochastic heating
MILCOM 2009 - 2009 IEEE Military Communications Conference, 2009
This paper presents ViFiTM, a V-band wireless local area network (WLAN) that utilizes the unlicen... more This paper presents ViFiTM, a V-band wireless local area network (WLAN) that utilizes the unlicensed V-band spectrum while resolving the propagation challenges at V-band. ViFiTM allows for utilization of existing compatible waveforms, such 802.11g and ultra-wide band (UWB), and provides anti-shadowing capability to provide mobility throughout the network coverage area. In addition, three main applications for ViFiTM are discussed in
2009 Systems and Information Engineering Design Symposium, 2009
Abstract—A renewable hybrid power generation system is proposed. The motivation for the system is... more Abstract—A renewable hybrid power generation system is proposed. The motivation for the system is that grid power is often unreliable, limited or even nonexistent remote/rural areas such as forward operating bases and schools and hospitals in developing countries. The challenge of this ...
Abstract The Langmuir-Blodgett (LB) films of conducting poly( p -phenylenevinylene) (PPV) were pr... more Abstract The Langmuir-Blodgett (LB) films of conducting poly( p -phenylenevinylene) (PPV) were prepared by thermal treatment (250°C, 1 Torr) of the LB film of the PPV precursor, amphiphilic poly( p -xylylene-σ-diethylsulphonium) salt with perfluorononanoate counterion. The formation of the π-conjugated PPV structure varied with the thermal annealing time and was studied by means of UV spectroscopy. The elimination of the sulphide and fluorinated fatty acid during the thermal treatment was determined quantitatively by X-ray photoelectron spectroscopy. Both results indicated that extension of the π-conjugated structure could be realized and conversion from the PPV precursor to PPV could be completed within 10 min under these conditions. Furthermore, transmission electron microscopy examination revealed a gradual change in the surface image from heterogeneous to homogeneous during the thermal treatment, which indicated that a smooth surface of the PPV LB film was gradually formed by the thermal conversion.
This paper presents a model of language processing where word segmentation is an integral part of... more This paper presents a model of language processing where word segmentation is an integral part of sentence analysis. We show that the use of a parser can enable us to achieve the best ambiguity resolution in word segmentation. The lexical component of this model resolves most of the ambiguities, but the final disambiguation takes place in the parsing process. In this model, word segmentation is a by-product of sentence analysis, where the correct segmentation is represented by the leaves of a parse tree. We also show that the complexity usually associated with the use of a parser in segmentation can be reduced dramatically by using a dictionary that contains useful information on word segmentation. With the aid of such information, the sentence analysis process is reasonably fast and does not suffer from the problems other people have encountered. The model is implemented in NLPWin, the general-purpose language understanding system developed at Microsoft Research. A demo of the syst...
... There are several minimum MAE within the search area. The as-sumption of these fast algorithm... more ... There are several minimum MAE within the search area. The as-sumption of these fast algorithms does not hold. In Chow and Liou's work, it points out that these algorithms may be trapped by number of local minimum[6]. Since fast algorithms find the motion vector with local ...
The structure and phase transformations in the near-surface layers of a low carbon steel (0.2 wt.... more The structure and phase transformations in the near-surface layers of a low carbon steel (0.2 wt.% C) subjected to a high-current pulsed electron beam (HCPEB) treatments have been investigated by using electron microscopy and X-ray diffraction (XRD). The high-current electron beam is characterized by low energy (20–30 keV), short pulse (3.5 μs), and high energy density (1.5–4 J cm−2). A
... Point defects agglomerate to form wavy and blurred boundaries parallel to the surface. ... Fi... more ... Point defects agglomerate to form wavy and blurred boundaries parallel to the surface. ... Fig. 6. Near-surface cross-section TEM bright-field image, revealing several waving and blurredboundaries. Parts of the boundaries coincide with dislocations. View Within Article. ...
American Society of Mechanical Engineers, Heat Transfer Division, (Publication) HTD, 1998
Radiative heat transfer in a system of packed particles is important for numerous industrial proc... more Radiative heat transfer in a system of packed particles is important for numerous industrial processes. Most of the existing numerical work have focused on specular spheres. There has been relatively less numerical work on a packing of diffuse spheres. There are some numerical studies on diffuse spheres, but their foci were not on the adequacy of the Monte-Carlo ray-tracing scheme. This study examines this issue and presents a modified ray-tracing scheme in which multiple rays are utilized. The results show this scheme to be more accurate for certain porous medium.
This paper presents a decoupled optimization technique for design of switching regulators using g... more This paper presents a decoupled optimization technique for design of switching regulators using genetic algorithms (GA). The optimization entails selection of the component values in the regulator to meet some static and dynamic requirements. During the optimization, a regulator is decoupled into two parts, including the power conversion stage (PCS) and the feedback network (FN). The PCS is optimized with
Uploads
Papers by Angus Wu