Applied Mechanics and Materials Vols. 644-650

Abstract: The key propose of this paper is to design a IoT(Internet of Thing) based farm environmental monitoring system and to realize the automate management of agriculture and the implementation of precision production. The system consists of three layers which are sensor layer, transmission layer and application layer, respectively. The modular structure is adopted to develop coordinator node and router node which have flexible structures and strong versatility, the node connects with sensors through standard analog interface, on the basis of which, high reliability, flexible Wireless Sensor Network (WSN) is built, the WSN can perceive environment information for greenhouse tomato growth in a real time way and transmit the data to the remote server management system reliably. Field experiments show that WSN is stable, reliable and provides basis for the scientific management of farm.

Abstract: In this paper, we apply the technology of Internet of things in wireless base station inspection. This actualize the long distance information acquisition about base station equipment and environment, actualize the real time feedback about hitch and alarm of station equipment, and improve stabilization of communication system and efficiency of inspections. A new remote control method based on SMS interception is proposed aiming at the problem that remote control must be connected to internet. Also a new anti-collision algorithm for simple labeling system is introduced aiming at the problem of multi-tag RFID conflicts. Finally, users can realize the remote control and inspection as long as they connect with internet.

Abstract: To improve the training effect of marine engine room simulator in the aspect of training marine engineer and save the cost of training in real ships, this paper extends the framework of traditional marine engine room simulator by taking full advantage of visual simulation technology and the configuration of framework is presented. The framework is divided into three parts by functionality which is three-dimensional engine room visual simulation side, server side and two-dimensional marine engine room simulator side and the function of each part is also described in details. To implement the function of interaction and collaborative operation of marine engine room simulator under this framework, communication protocol between three-dimensional side and two-dimensional is established and processing mode of interactive entity is designed. This marine engine visual simulation training system has been applied to actual training, achieved better training effect and save the cost of training in real ships of marine education effectively.

Abstract: Function point estimating is an important method for system of effort estimation. This article is based on a telecommunication surveillance module system-integrated monitoring module as example. It explains how this estimation method is applied in the project measurement process in detail.Function Point AnalysisFunction point analysis evaluates the functionality of a software system from the software end users perspective. Software functionality comes down to five basic functional elements^[1], two of which represent end user demand for data: internal logical files (ILF) and external interface files (EIF). The other three are data gathering and processing features: external inputs (EI), external outputs (EO), external inquiries (EQ)^[2].To determine the complexity of each functional element, the following data items are defined: record element type (RET), file type referenced, (FTR), data e1ement type (DET)^[3]. To determine all functionalities complexity level, each data and transactional capabilities is assigned with low, average and high level based on standard matrix, see table 1 complexity matrix^[4]. After determining the complexity of each feature, using the complexity value defined in table 2^[5] multiply by the corresponding function point counts, accumulate to get the totals.Table 1: complexity matrixTable 2: IFPUG unadjusted function point basis

Abstract: For high security and reliability of system critical areas, this paper designed a high-confidence fault-tolerant computer system, which combined high credibility technology with high organic reliability integration. High trusted computing technology used TCM structure to build a trusted password support system and achieve the platform integrity, identity authentication and data security. Redundant fault-tolerant technology to ensure the system, which activated in case of an error, is still able to provide uninterrupted service. Simulation results show the effectiveness and implementation of the technical solution approaches.

Abstract: With the rapid development of the Internet, the number of firewall rules is increasing. The enormous quantity of rules challenges the performance of the packet classification that has already become a bottleneck in firewalls. This dissertation proposes a rapid and multi-dimensional algorithm for packet classification based on BSOL(Binary Search On Leaves), which is named FMPC(FastMulti-dimensional Packet Classification). Different from BSOL, FMPC cuts all dimensions at the same time to decompose rule spaces and stores leaf spaces into hash tables; FMPC constructs a Bloom Filter for every hash table and stores them into embedded SRAM. When classifying a packet, FMPC performs parallel queries on Bloom Filters and determines how to visit hash tables according to the results. Algorithm analysis and the result of simulations show: the average number of hash-table lookups of FMPC is 1 when classifying a packet, which is much smaller than that of BSOL; inthe worst case, the number of hash-table lookups of FMPCisO(logwmax+1⁡), which is also smaller than that of BSOL in multi-dimensional environment, where w_max is the length, in bits, of the dimension whose length is the longest..

Abstract: This paper targets to the lag of code protection technology for Mach-O executable file on iOS. Consideration of code tamper, code injection on iOS, this paper has proposed a code protection scheme MFP(Mach-O File Protector) featuring with both encryption function and anti-debugging function based on UPX(the Ultimate Packer for eXecutables). Compared with UPX, MFP encrypt Mach-O executable file through 3DES and insert anti-debugging code to disable mainstream debugging software.

Abstract: Database is distributed stored in cloud. The paper found that joint distribution can base on frequent data manipulation, and frequent connection property. So it proposed cloud database data distribution strategy based on association rules. The data distributed storage is according to the frequent data manipulation rules. Experiments demonstrate that this strategy can significantly reduce database query response time, especially in connection query response time.

Abstract: Conventional productivity research method of fractured horizontal wells doesn’t meticulously describe the seepage characteristics of the near wellbore area. Based on the similarity of seepage field and temperature field, and ANSYS finite element software platform, this paper conducts the simulation calculation of the fractured horizontal wells’ productivity, shows the flow of near wellbore area, and analyzes the factors affecting the productivity on fractured horizontal well by using the heat flow field model in the ANSYS software platform. The results show that the larger the angle between fractures and horizontal wells, the higher the production. It is necessary to place the fractures stagger to the greatest extent, and the fracture spacing should be extended as much as possible in actual production. This optimization design of fractured horizontal well has a certain role in guiding.

Abstract: Nowadays, augmented reality technology is changing our traditional reading way. Children’s books can provide immersive experience which is personally on the scene to children with augmented reality scene, three-dimensional modeling technique, etc. It is no doubt that augmented reality scene not only creates an art present surface of enhancing effect for authors, but also gives an extra process of experience to participators. The paper discusses the key technology of ARToolKit, and applies ARToolKit to children’s books area.