在建筑施工、房屋装修场景下,传统电动螺丝刀攻螺钉效率、安全性和正确攻入工作面的成功率低下,为改善此问题,设计一种能自动供给与攻螺钉的螺钉枪.对传统手电钻加装能够自攻且能装载多枚螺钉的枪体结构:螺钉弹夹装载螺钉,旋转驱动器驱动螺钉至弹道位置,螺钉轨道约束器约束螺钉与弹道同心,滑轨作为螺丝刀攻螺钉的辅助滑动轨道,提高了攻螺钉的效率、安全性和成功率.

Chinese universities use the multi-outgoing exports to solve the problem of the traffic of bandwidth to the Internet for the campus network, but the world wide web servers in the campus network might still be accessed very slowly by some users outside the campus network (from the public network). We discuss and analyze the reasons for slowly accessing to the campus network form the public networks and a novel solution for high-speed accessing to the campus network for the local client in public network is put forward. We first introduce an NAT (Network Address Translation) traversal approach based on reverse TCP (Transmission Control Protocol) connection, which has the advantage of not requiring any intermediary server. We test our NAT traversal approach in real network environment and the results show that it is effective. Meanwhile, we also test the network performance between the campus network and the local public network after the NAT Router between them has been traversed by our approach and the results show that the network performance by the second export accessing to the campus network is much better than by the campus network export.

Customer's demands have different abstract levels, and the users' inspection of business process is different from the programmers', which increases complexity of system design; At the same time, the traditional Management Information System doesn't distinguish between the management logic and business logic, making the current system not meet the needs caused by open and dynamic environment, which hinders the development of enterprise. The work of this article is study on how to build flexibility and adaptability Work Flow Management System based on ubiquitous computing to increase the flexibility and extensibility of system, meeting the needs of business process's modification and Building.

Du et al. put forward a solution to solve the slow access to the campus network. This solution offered a novel approach to complete NAT Traversal of the second export of the campus network and a good idea based on virtual private network (VPN) to realize the outer network can rapidly access the campus network with any application layer protocols, e.g., HTTP, FTP. A VPN solution based on UDP tunnel and Open VPN tap interface is designed and implemented to achieve above mentioned goal in this paper. We package the OpenVPN Tap interface into a Dynamic Link Library (DLL) and program an VPN client and server in Java by calling our DLL API. Performance of the UDP-based VPN solution is evaluated and compared in a real network environment and between the campus network and the outer network. The results show that our solution is effective and can satisfy the actual requirements of network applications.

We introduce a new, substantially simplified version of the toggling-branching recurrence operation of computability logic, prove its equivalence to Japaridze’s old, “canonical” version, and also prove that both versions preserve the static property of their arguments.

This article discusses cloud computing data security issues, including the security of data transmission, storage, security and management of security. Focus on universal data management affect cloud security analysis, and pointed out that a breakthrough in the development of this cloud computing, try to enumerate the corresponding strategies and long-term development direction. Final part is a summary and outlook about future development of cloud computing security issues.

Firstly, the problem of slow accessing to the dual-export scheme of campus network when the public network users take the initiative to visit campus network resources are analyzed more deeply, and then we introduce virtual network adapter technology and an VPN (Virtual Private Network) solution based on Ethernet over UDP (User Datagram Protocol) tunnel is put forward to solve the problem. After the second export NAT (Network Address Translation) Router of campus network is traversed through UDP, the campus network service, e.g. HTTP (Hypertext Transfer Protocol) and FTP (File Transfer Protocol), can be visited by public network users using our solution. Design and implementation, as well as some details of this tunnel solution are discussed in this paper. Performance of the tunnel solution is evaluated and compared in several kinds of real network environments, and results show that our solution is effective and can satisfy the actual requirements of network applications. © 2012 Binary Information Press.

This paper presents a Random number generation system of examination based on VC++.It shows the architecture and structure,merits and key technology in detail.The system can further improve efficiency and flexibility and it is especially fit for Institutions of higher learning.At last,a full realized software is shown.