zhao cheng | Renmin University of China (original) (raw)

Papers by zhao cheng

2011 International Conference on Computer Science and Service System, 2011

Complex, 2009

In the coordinated collective behaviors of biological swarms and flocks, the attractive/repulsive... more In the coordinated collective behaviors of biological swarms and flocks, the attractive/repulsive (A/R) functional link between each pair of particles plays an important role. By changing the slope of the A/R function, a dramatic transition between different aggregation patterns surfaces. With a high value of the slope, the particle aggregation shows a liquid-like pattern in which the outer particles are sparsely distributed while the inner ones densely. In addition, the particle density is reduced from the outside to the inside of each cluster. By comparison, when the slope decreases to a sufficiently low value, the particle aggregation exhibits a crystal-like pattern as the distance between each pair of neighboring particles remains constant. Remarkably, there is an obvious spinodal in the curve of particle-particle distance variance versus the slope, indicating a transition between liquid-like and crystal-like aggregation patterns. Significantly, this work may reveal some common mechanism behind the aggregation of physical particles and swarming of organisms in nature, and may find its potential engineering applications, for example, UAVs and multi-robot systems.

Wsc, 2004

The main objective of this intelligent designing research is to provide an astute environment for... more The main objective of this intelligent designing research is to provide an astute environment for designers. This type of environment is to be designed and processed so that it is compatible with a person’s thoughts. In this environment the designers’ thoughts are effectively taken to process functional requirements of products. The concept of designing and evaluating the schemes of the products can be achieved and furthermore optimized, the structure designing and its manufacturability analysis are carried out. This paper studies cell classes of the functions and structures. By the use of artificial intelligent technology the knowledge required and the innovative scheme expressed are developed. As an example, an intelligent design of a motorcycle is used to illustrate the application of the method to produce an innovative scheme.

Proceedings of the National Academy of Sciences of the United States of America, 1995

The mechanisms by which insulin-like growth factors (IGFs) can be both mitogenic and differentiat... more The mechanisms by which insulin-like growth factors (IGFs) can be both mitogenic and differentiation-promoting in skeletal myoblasts are unclear because these two processes are believed to be mutually exclusive in this tissue. The phosphorylation state of the ubiquitous nuclear retinoblastoma protein (Rb) plays an important role in determining whether myoblasts proliferate or differentiate: Phosphorylated Rb promotes mitogenesis, whereas un- (or hypo-) phosphorylated Rb promotes cell cycle exit and differentiation. We hypothesized that IGFs might affect the fate of myoblasts by regulating the phosphorylation of Rb. Although long-term IGF treatment is known to stimulate differentiation, we find that IGFs act initially to inhibit differentiation and are exclusively mitogenic. These early effects of IGFs are associated with maintenance of Rb phosphorylation typical of proliferating cells; upregulation of the gene expression of cyclin-dependent kinase 4 and cyclin D1, components of a holoenzyme that plays a principal role in mediating Rb phosphorylation; and marked inhibition of the gene expression of myogenin, a member of the MyoD family of skeletal muscle-specific transcription factors that is essential in muscle differentiation. We also find that IGF-induced inhibition of differentiation occurs through a process that is independent of its mitogenic effects. We demonstrate, thus, that IGFs regulate Rb phosphorylation and cyclin D1 and cyclin-dependent kinase 4 gene expression; together with their biphasic effects on myogenin expression, these results suggest a mechanism by which IGFs are initially mitogenic and subsequently differentiation-promoting in skeletal muscle.

Optimization, 1994

ABSTRACT

Chinese Optics Letters, Jul 9, 2004

A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional opt... more A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Ti:sapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1*10^(12) b/cm3. Some advantages of the employment of SIL have been discussed.

Proceedings of the Ieee, 2008

Journal of the Brazilian Chemical Society, Oct 1, 2012

Proceedings of the 2011 Third International Conference on Measuring Technology and Mechatronics Automation Volume 01, Jan 6, 2011

2009 Fourth International Conference on Communications and Networking in China, 2009

In this paper, the logical function of CCTS transistor bistable laser is theoretically analyzed a... more In this paper, the logical function of CCTS transistor bistable laser is theoretically analyzed and experimentally studied from the non-line equation, and its quantitative and quality analysis results has been drawn, at the same time. It has been found that when the laser output high state and the injection electrical is continually increased, there occurs another bistable phenomenon. It is

Journal of Applied Physics, 2001

The heat capacities of the ternary compounds RENiC2 (RE=Dy, Ho, Er, and Y) were studied in the te... more The heat capacities of the ternary compounds RENiC2 (RE=Dy, Ho, Er, and Y) were studied in the temperature range between 2 and 30 K. From the heat capacity curves, the ordering temperatures are found to be 7.5, 3.0, and 8.1 K for DyNiC2, HoNiC2, and ErNiC2, respectively. Also a small peak is found at 4.7 K for DyNiC2. The heat

Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a ... more Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading

International Journal of High Performance Computing and Networking, 2006

Proceedings of SPIE - The International Society for Optical Engineering

ABSTRACT

19th Intl Congress on High-Speed Photography and Photonics, 1991

ABSTRACT Cubic responses in photoelectron emission from a , 02 activated GaAs layer, illuminated ... more ABSTRACT Cubic responses in photoelectron emission from a , 02 activated GaAs layer, illuminated by a Q-switched Er ,Thi,Ho : YLF laser ( 2 .O6um) both at room temperature and at liquid nitrogen temperature ( 77K ) were investigated . Photocurrent density proportional to the cubic of intensity of incident light over three orders of magnitude at both temperatures shows not only thatthe electron emission is three-photon photoemission, but also that thermal emission is nebligible at room temperature in our case. The photoemissive current from a P-type monocrystal GaAs substrate activated only by caesium shows six power dependence on light intensity . Comparisons of measured three-photon photoemission coefficient of GaAs(Cs,02) with a theoretical estimated values and with four-photon photoemission coefficient of a Cs3Sb photocathode are given.

2009 IEEE International Symposium on IT in Medicine & Education, 2009

Soil Dynamics and Earthquake Engineering, 2009

Presented in this paper is numerical methodology to model and simulate behavior of piles in lique... more Presented in this paper is numerical methodology to model and simulate behavior of piles in liquefiable soils. Modeling relies on use of validated elasto-plastic material model for soil skeleton, verified fully coupled porous media (soil skeleton) – pore fluid (water) dynamic finite element formulation, and detailed load staging of FEM models. A bounding surface elastic–plastic sand model that accounts for

2011 International Conference on Computer Science and Service System, 2011

Complex, 2009

In the coordinated collective behaviors of biological swarms and flocks, the attractive/repulsive... more In the coordinated collective behaviors of biological swarms and flocks, the attractive/repulsive (A/R) functional link between each pair of particles plays an important role. By changing the slope of the A/R function, a dramatic transition between different aggregation patterns surfaces. With a high value of the slope, the particle aggregation shows a liquid-like pattern in which the outer particles are sparsely distributed while the inner ones densely. In addition, the particle density is reduced from the outside to the inside of each cluster. By comparison, when the slope decreases to a sufficiently low value, the particle aggregation exhibits a crystal-like pattern as the distance between each pair of neighboring particles remains constant. Remarkably, there is an obvious spinodal in the curve of particle-particle distance variance versus the slope, indicating a transition between liquid-like and crystal-like aggregation patterns. Significantly, this work may reveal some common mechanism behind the aggregation of physical particles and swarming of organisms in nature, and may find its potential engineering applications, for example, UAVs and multi-robot systems.

Wsc, 2004

The main objective of this intelligent designing research is to provide an astute environment for... more The main objective of this intelligent designing research is to provide an astute environment for designers. This type of environment is to be designed and processed so that it is compatible with a person’s thoughts. In this environment the designers’ thoughts are effectively taken to process functional requirements of products. The concept of designing and evaluating the schemes of the products can be achieved and furthermore optimized, the structure designing and its manufacturability analysis are carried out. This paper studies cell classes of the functions and structures. By the use of artificial intelligent technology the knowledge required and the innovative scheme expressed are developed. As an example, an intelligent design of a motorcycle is used to illustrate the application of the method to produce an innovative scheme.

Proceedings of the National Academy of Sciences of the United States of America, 1995

The mechanisms by which insulin-like growth factors (IGFs) can be both mitogenic and differentiat... more The mechanisms by which insulin-like growth factors (IGFs) can be both mitogenic and differentiation-promoting in skeletal myoblasts are unclear because these two processes are believed to be mutually exclusive in this tissue. The phosphorylation state of the ubiquitous nuclear retinoblastoma protein (Rb) plays an important role in determining whether myoblasts proliferate or differentiate: Phosphorylated Rb promotes mitogenesis, whereas un- (or hypo-) phosphorylated Rb promotes cell cycle exit and differentiation. We hypothesized that IGFs might affect the fate of myoblasts by regulating the phosphorylation of Rb. Although long-term IGF treatment is known to stimulate differentiation, we find that IGFs act initially to inhibit differentiation and are exclusively mitogenic. These early effects of IGFs are associated with maintenance of Rb phosphorylation typical of proliferating cells; upregulation of the gene expression of cyclin-dependent kinase 4 and cyclin D1, components of a holoenzyme that plays a principal role in mediating Rb phosphorylation; and marked inhibition of the gene expression of myogenin, a member of the MyoD family of skeletal muscle-specific transcription factors that is essential in muscle differentiation. We also find that IGF-induced inhibition of differentiation occurs through a process that is independent of its mitogenic effects. We demonstrate, thus, that IGFs regulate Rb phosphorylation and cyclin D1 and cyclin-dependent kinase 4 gene expression; together with their biphasic effects on myogenin expression, these results suggest a mechanism by which IGFs are initially mitogenic and subsequently differentiation-promoting in skeletal muscle.

Optimization, 1994

ABSTRACT

Chinese Optics Letters, Jul 9, 2004

A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional opt... more A solid immersion lens (SIL) has been applied to the writing and reading of three-dimensional optical data storage in transparent materials. Using a SIL with n=1.516 to focus a 150-fs, 800-nm Ti:sapphire laser, the 5-layer reading and writing of data are achieved in fused silica and polyethylene methacrylate at a density of 1.1*10^(12) b/cm3. Some advantages of the employment of SIL have been discussed.

Proceedings of the Ieee, 2008

Journal of the Brazilian Chemical Society, Oct 1, 2012

Proceedings of the 2011 Third International Conference on Measuring Technology and Mechatronics Automation Volume 01, Jan 6, 2011

2009 Fourth International Conference on Communications and Networking in China, 2009

In this paper, the logical function of CCTS transistor bistable laser is theoretically analyzed a... more In this paper, the logical function of CCTS transistor bistable laser is theoretically analyzed and experimentally studied from the non-line equation, and its quantitative and quality analysis results has been drawn, at the same time. It has been found that when the laser output high state and the injection electrical is continually increased, there occurs another bistable phenomenon. It is

Journal of Applied Physics, 2001

The heat capacities of the ternary compounds RENiC2 (RE=Dy, Ho, Er, and Y) were studied in the te... more The heat capacities of the ternary compounds RENiC2 (RE=Dy, Ho, Er, and Y) were studied in the temperature range between 2 and 30 K. From the heat capacity curves, the ordering temperatures are found to be 7.5, 3.0, and 8.1 K for DyNiC2, HoNiC2, and ErNiC2, respectively. Also a small peak is found at 4.7 K for DyNiC2. The heat

Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a ... more Three-dimensional bitwise optical recording with a density of 500 Gb/cm3 in fused silica using a Ti:sapphire femtosecond laser modulated by binary digits is demonstrated. Laser pulses modulation is realized by modulating two circuits of trigger pulses signal which are used to control laser pulses trapping and switching out from cavity, respectively. Bits are optically readout in both a parallel reading

International Journal of High Performance Computing and Networking, 2006

Proceedings of SPIE - The International Society for Optical Engineering

ABSTRACT

19th Intl Congress on High-Speed Photography and Photonics, 1991

ABSTRACT Cubic responses in photoelectron emission from a , 02 activated GaAs layer, illuminated ... more ABSTRACT Cubic responses in photoelectron emission from a , 02 activated GaAs layer, illuminated by a Q-switched Er ,Thi,Ho : YLF laser ( 2 .O6um) both at room temperature and at liquid nitrogen temperature ( 77K ) were investigated . Photocurrent density proportional to the cubic of intensity of incident light over three orders of magnitude at both temperatures shows not only thatthe electron emission is three-photon photoemission, but also that thermal emission is nebligible at room temperature in our case. The photoemissive current from a P-type monocrystal GaAs substrate activated only by caesium shows six power dependence on light intensity . Comparisons of measured three-photon photoemission coefficient of GaAs(Cs,02) with a theoretical estimated values and with four-photon photoemission coefficient of a Cs3Sb photocathode are given.

2009 IEEE International Symposium on IT in Medicine & Education, 2009

Soil Dynamics and Earthquake Engineering, 2009

Presented in this paper is numerical methodology to model and simulate behavior of piles in lique... more Presented in this paper is numerical methodology to model and simulate behavior of piles in liquefiable soils. Modeling relies on use of validated elasto-plastic material model for soil skeleton, verified fully coupled porous media (soil skeleton) – pore fluid (water) dynamic finite element formulation, and detailed load staging of FEM models. A bounding surface elastic–plastic sand model that accounts for