Abstract: A compound Chaos encryption algorithm for digital images is designed in this paper. Lorenz Chaotic system and Logistics map are linked in cascade to generate Chaos sequences. Then the permutation matrix is constructed to encrypt the digital image. The new algorithm can expand the key space and improve anti-aggressive ability. Matlab7.0 is used for simulation testing of the image encryption. Experimental results show that the algorithm is feasible and it can satisfy the security requirement for image transmission and storage. The compound Chaos algorithm can be also used for color digital image encryption.
Abstract: In this paper, we analyze the optical network with wavelength conversion, and discuss the architecture of network with wavelength converter in its node. The optical cross connects technology for wavelength division multiplexing (WDM) is rapidly developing. Wavelength conversion is one of the key techniques for switch WDM optical networks. The wavelength conversion technology can achieve wavelength reuse, decrease wavelength competition, enhance network flexibility and scalability, and simplify network structure and management. The results show that If these cross-connectors feature integrated with wavelength conversion, network will be better able to play the full potential of WDM optical networks.
Abstract: With the rapid development of optical network technology, a thing worth noting is the generalized multi-protocol label switching (GMPLS) technology in optical network has been more used, mainly in auto-switching transmission network. GMPLS is an advanced protocol which is essential for managing a diverse and complex networks, GMPLS has caused technical challenges in its deployment in optical networks. In this paper, we analyze the evolution to optical network, and discuss the GMPLS technology and its applications. GMPLS will become the important protocol in future optical network.
Abstract: In this paper, a new design for the network traffic balance method is presented. In optical network, the wavelength is one of the most important resources, and wavelength assignment is one of the main factors that affect the efficiency of the network utilization. The performance optimization of networks is actually a control problem. Traffic engineering should provide sufficient control in an adaptive feedback control system. The tasks of a controller consist of the modification of traffic management parameters, the modification of routing parameters, and modifications of resource attributes and constraints. With the traffic balance, the network operation will be more efficient and the network blocking may decrease.
Abstract: We all known that using space-borne or airborne SAR can implement the parameters of internal wave, but the automatic method to abstract internal wave parameters from SAR data depend on computer is a practical question without settled. Based on practical application, this paper established automatic detection method of internal waves; through this method we can get the wave’s transmission direction. This method had been checked through multiple SAR data of internal wave and also had been approved validity and utility.
Abstract: A novel photochromic diarylethene based on isoxazole moiety was synthesized and its photochromic and fluorescent properties were also investigated. The compounds exhibited remarkable photochromism, changing from colorless to red after irradiation with UV light both in solution and in PMMA film. The fluorescence had a remarkable initial increase with subsequent dramatic decrease with increasing concentration. The results indicated that the isoxazole moiety played a very important role during the process of photochromic reaction for the diarylethene derivative.
Abstract: Faced with the impact of increasingly demand of customers, competitions and frequent changes, the contemporary enterprises must carry out deep analysis on the traditional working and organizing ways of enterprises, fundamental rethink and thoroughly redesign the enterprise's business process, integrate a series activities of cross-functional and cross-border involved in the process from the aspect of meeting the demand of internal activities and the needs for external customers. This article first carries out analysis on the workflow technology, life cycle, Business Process Reengineering and implementation stages, concludes that workflow technology can better support all stages of Business Process Reengineering and better realize the process management and control. Finally, this article makes a detailed description on the relevant work, methods and tools of all implementation stages in Business Process Reengineering based on workflow technology.
Abstract: A newly devised process using round bar-shaped electrodes and ultrasonic enhancement in a micro-electrochemical machining (UMECM) process is described. The purpose is the precise removal of In2O3SnO2 thin-film nanostructures from optoelectronic flat panel display color filter surfaces. In the current experiment it was found that a large surface area cathode and a small gap-size between the cathode and workpiece was found to remove the In2O3SnO2 rapidly. A high feed rate of the workpiece (the display with color filter) and adequate electrical power results in fast machining. Pulsed direct current improves dregs discharge and this is an advantage with a fast feed. A high electrode rotational speed also corresponds to faster removal of the In2O3SnO2 nanostructures. The development of the proposed precision production design is based on both technical and economic considerations.
Abstract: A novel unsymmetrical diarylethene derivative bearing both phenyl and thiophene moieties, in which a trifluoromethyl group was substituted at the meta-positions of the terminal phenyl ring, was synthesized. At the same time, its photochromic properties and fluorescence switch were investigated in detail. The results showed that this compound exhibited reversible photochromism, undergoing reversible cyclization and cycloreversion reactions upon alternating irradiation with UV and visible light both in solution and in PMMA film, and its absorption maxima were observed at 517 nm in hexane and at 523 nm in PMMA amorphous film, respectively, upon irradiation with 297 nm UV light. The fluorescence intensity of diarylethene decreased dramatically along with the photochromism from open-ring isomer to closed-ring isomer upon irradiation with 297 nm UV light in PMMA. In hexane solution, the open-ring isomer of the diarylethene 1 exhibited relatively strong fluorescence at 395 nm when excited at 295 nm.
Abstract: Fluorescent photoswitching molecule in which photochromic diarylethene with six-number phenyl unit and thiophene ring attached a phenyl methoxy group was synthesized. The compound exhibited pronounced photochromic and synchronous fluorescence switching properties. Irradiation of the open form of compound with UV light resulted in immediate photocyclization to the blue closed form with nonfluorescence; the colorless open form with fluorescence character could be regenerated by irradiation with visible light. In terms of potential use for optical storage and readout, this compound displays fluorescence discrimination between its open and closed form. This fluorescence switching could be the basis of a remote control nondestructive readout method.