Study On Selective Hydrogenation Of Bebzene To Cyclohexene

With the rapid development of the computer technology and the network technology, the attendance management system develops continuously towards integration, intelligence. Network and Distributed direction. In various enterprises, the appraisal work of employees is not only a heavy workload, and time-intensive. In the past, the company is managed in form of fingerprint, IC cards, and statements, which is poor of efficiency and transparency, ana easy to mistake:with the development of RFID technology and the construction of enterprise information, we manage Enterprise Attendance work using RFID technology is the trend of times, which saves a lot of time and management efficiency for the company appraisal work, but also greatly reduces the workload of attendance staff.Firstly, the paper analyses the status of attendance systems and RFID technology in our country, then introduces RFID technology, and compare with the advantages and disadvantages between the radio frequency identification technology and other automatic identification technologies. It expatiates on the design of networking applications, and the design of Core Hardware and Management Software in the attendance system.According to the development requirements, the attendance management system realize the validity of the card card number through serial communication with PC. All serial communications with PC are by way of invoking the function in the serial communication dynamic link library. The serial communication dynamic link library is introduced particularly in the paper, and the realization of the multithreading serializing the communication read and write threads.We establish a set of attendance management software system to manage the staff,card and time-sheet data more conveniently. The design of system database,PC access to the database,and the design of Attendance Data Sheet, which are all introduced particularly in the paper; including the design of the software function of each module,implementation and the contents of each functional module management.The system regards Windows 2003 Server as the platform, using B/S architecture,OraclelOG database as the background, Microsoft Visual Studio.Net 2008 Enterprise as the development tools. Development in accordance with the methods of software engineering, object-oriented methods using UML modeling and analysis system combined with smart IC card and attendance machine card collecting raw data to ADO way of connecting to the database, applications Windows API functions to realize serial communication and advanced attendance management theory, to achieve the attendance management business process automation and scientificThis system compared with the traditional time attendance management systems, besides use, functional, time-saving features, which also has other features, such as a group attendance, account manager; time shifts, life can be; clearing accurate, detailed reports; diversifying the attendance processing results, attendance machine can stand-alone or networked to use. It solves the difficulty of work attendance because of Multi-frequency, holiday and more and more overtime and completely eradicates Attendance sham, do a good turn. There are outstanding applied effects for the enterprises to improve management, save resources and improve the efficiency.