Tiansheng Hong

Closed-loop drip irrigation control using a hybrid wireless sensor and actuator network

In this research, a closed-loop drip irrigation control hybrid wireless sensor and actuator network (HWSAN) prototype were developed and deployed in a crop field for soil property precise measurement and precision irrigation in accordance with the measured soil property. The HWSAN was composed of a wireless sensor and actuator network (WSAN) used for in-field soil property monitoring and irrigation control and a laboratory supervising system. The WSAN included ten sensor nodes, five irrigation control nodes, a central node, a gateway and a cellular modem. The laboratory supervising system was formed by a web-server. The system could automatically sample soil properties including soil moisture, electrical conductivity, and nearsurface temperature at four different depths underground and transmit field data through cellular network to the web-server. Closed-loop control was achieved through the control nodes listening uploading packets from its paired sensor nodes to control drip irrigation. Results from the quality of service (QoS) evaluation included: the data packet transmission rate was 84.76%, data accuracy rate was greater than 97% and no in-field data transmission errors.

Plan and Design of Intelligent Citrus Orchard Irrigation System

The shortage of water resources is attracting more and more attention. The development of computer technology, controlling technology, electronic technology provides a new solution for efficient use of water. In this paper, an intelligent citrus orchard irrigation system is planned and designed, the wireless network is responsible for data transmission of the entire system, sensors which are controlled by SCM collect data of irrigation areas, then control information of irrigated areas is sent to control irrigation equipment to normally operate according to data analysis, which can effectively use water resources.

Training Mode of Agricultural Engineering Talents Based on Industry

Researched on the training goal and requirement of agricultural engineering professional talents, the construction characteristics and features of agricultural engineering undergraduate specialty are analyzed based on the modern agricultural industry development. A construction plan of agriculture engineering specialty which interacts with industry is discussed from the curriculum system, teaching team and experiment teaching. Referenced the experience of international engineering specialty certification, the optimization approaches and measures of training mode for modern agricultural engineering professional talents are proposed from three aspects of education notion, teaching conditions and education process. The characteristics of three combinations which build agricultural engineering specialty training plan based on modern industry are concluded to guide the talents training scheme design and teaching implementation of agricultural mechanization and automation specialty.

Research of WLAN CAN Bus Data Test System

Both controller area network (CAN) and wireless local area network (WLAN) bus technologies are developing rapidly nowadays. But the study on WLAN technology with CAN bus data is relative to be less researched. So a WLAN CAN bus data test system was present in this paper. The system hardware consists of two control modules, each of which consistently allows link test to the CAN bus network. Each hardware of the module is composed by a microcontroller STC12C5410AD, a CAN bus control unit MCP2515, a CAN bus transceiver MCP2551 and a RF wireless module RF903. During the test process, the CAN bus analyzer, Kvaser USBCAN II, receives and dispatches the CAN messages. Test results showed that the system’s error score was approximately zero when messages are transmitted and the system can message transmission from one side of CAN panel point to the other side. The communication of the system is suitable for the CAN treaty standard and it can allow wireless message transmission to other suitable networks meeting the CAN treaty standard as well. Finally the system has been applied to the project for hill citrus leaf area index (LAI) acquisition.

Test Research of Pipeline Spraying Constant Pressure Controlling in Orchard

The spraying efficiency can be greatly improved by using pipeline spraying in larger orchard, meanwhile, labor strength could be reduced greatly and the pest control efficacy could be improved. Adopting constant pressure control devices can improve the stability of liquid pressure in pipeline, reduce the liquid pressure fluctuation which caused by the changing of spraying nozzles number. The spraying experimentations were carried in orchard by using constant pressure controller. Experimental result indicated that, using the constant pressure control device, the control error was 0.0167Mpa, the pressure control stability was 98.33%, the downtime to prevent pipeline bursting was 8.04s and the downtime after pipeline burst accidently was 8.88s. Using constant pressure controlling, stability of liquids pressure in the pipeline could be guarantee and pipeline bursting could be prevented at the same time.

Paired Characterization and Preliminary Correction of Low-Cost Soil Moisture Sensors for Wireless Sensor Network Application

In order to fulfill the need of minimizing sensor cost and characterizing sensor agricultural application for the promising wireless sensor network technology, this paper evaluates a pair of SMC sensors (EC-5 and 5TE) under some laboratory experiments which is based on a standardized sensor characterization methodology using liquid medium with a known standard water content. The results showed that the electronics of the EC-5 and the 5TE are sensitive to temperature, electric conductivity and pH variations and it is concluded that both the 5TE sensor and the EC-5 sensor are suitable for wireless network applications. Moreover, the results of this paper also suggested that the effects of temperature, electric conductivity and pH on the sensor measurement ability have to be compensated using the appropriate correction functions. Future work will focus on the field application of these sensors and their correction effects in more detail to derive more general correction functions.

Realization of the Data Surveillance Technology Based on the B/S Framework

Data surveillance is widely used in the actual production areas of process industry. This paper attempt s to discuss and study a brand new data surveillance technology based on the B/ S scheme from two aspect s of theoretical design and practical application. In theory, this technical system design needs to focus on the system architecture and function design. In application, the realization of this technical system depends on the introduction of an important technology named AJAX. This paper will also take the realization of the flow chart module and the real time tendency chart module as an example to further explain how to put this technology into practice. Communication is the solution to all of these challenges.

Study on 3D Virtual Reality Modeling

We build out a very vivid and real conditions environment based on the virtual reality of a simulation computer technology, so that users can be in a virtual environment through the man-machine interface with a virtual environment direct interaction. This paper studies 3d virtual model development and integration including the system design to realize the functions and systems integration. In its implementation, we use the model tool, 3 D R C to structure three-dimensional model, and the model tool, and finally we use virtools tool to achieve a three-dimensional with the establishment of virtual scene model. Virtual reality (virtual reality, VR) is a computer senior man-machine interface on the basic feature of absorbion, interactiveness and constructiveness [1,2]. Specifically, virtual reality is a computer that creates the stereoscopic spaces, and users can interact space objects in the interaction and watch the operation of some part of the objects in space, and freely move with the users will so that a sense of integration and participation are produced[3,4]. It is used in computer technology at the core of modern high technology ,which means to build a realistic view, hear and touch the integration of a virtual environment with the necessary equipment and a virtual environment of the interaction and mutual influence, which results in the immersion be true of the environment and feel[5-7]. VR technology is computer technology, computer graphics, computer simulations visual and technical, visual physiology, psychology, the microelectronics visual display technique, solid technology, sensing to measure the technical, technological, information technology, and voice recognition software engineering and technology, integrated man-machine the skill interfacing, and network technology and artificial intelligence technology and the achievement of other high technology. Since the birth of a virtual reality technology, it has the huge economy, military and the internet, multimedia minded race in many areas in the application of technology in the 21st century as the three-big technologies.

Study on Schemes for Seamless Multicast Handover in the Proxy Mobile IPv6 Based on Wireless Networks

The research was carried on centered about the key technology in the Proxy Mobile Ipv6 networks. The frame based on multi-level domains multicast agent was proposed. And the multi-level domains multicast agent who can be collocated easily was also introduced. The different service area of multi-level domains multicast agent is overlapped which can avoid “single point of failure.” The router advertisements of Ipv6 discovered the dynamic change of availed multi-level domains multicast agent and network topology. An ASMM (Auto Study Mobile Multicast) program was proposed on the based frame of multi-level domains multicast agent. The way of sending multicast data in outer region can be chosen neatly taking advantage of the number of mobile host in outer region according to the network situation in this program instead of sending multicast data in only one mode which achieved seamless handover. In recent years, the rapid development of internet and mobile networks makes people demand the combination of internet and mobile networks more and more eagerly which can provide extensive business for mobile users. And multicast is a very promising technology in mobile network. It can enable a group of mobile users to receive the message from the same business source at the same time which improved network efficiency greatly [1]. The mobile multicast technology is facing many problems. Firstly, all multicast technology was designed for fixed host; the multicast tree established on these agreements can be changed easily. And it will cost much if it is changed; Secondly, The mobile multicast technology not only considers the dynamic change of every group members but also the location dynamic change of every group members [2, 3]. So, the mobile multicast technology is a research focus at present. IETF and many researchers proposed much mobile multicast agreement. But these agreements have different inadequateness.

Experimental Path-Loss Models for 2.4GHz In-field Wireless Sensor Network

Wireless sensor network (WSN) technology is a promising solution for large-scale, real-time, and continuous soil property data acquisition. However, the applications are still very limited due to a lack of understanding of in-field data transmission performance of the WSN. In this study, commercial 2.4 GHz wireless sensor modules (referred to as “mote”) and a hand-held spectrum analyzer were used to set up a test platform to evaluate radio propagation performance. Indexed packets transmitted from a module were captured by the spectrum analyzer to measure path-loss through received signal strength (RSS) and synchronously received by another module named base station to calculate packet delivery rate (PDR). Experiments were conducted in a wheat field of an experimental farm of Oklahoma State University. Canopy height, transmitter height, receiver height and transmitter-to-receiver distance (T-R distance) were considered as impact factors on radio propagation. Correlation analysis was used to evaluate the relationship between path-loss and PDR. The results indicated that, with the increase of the plant height, path-loss and PDR became more correlated with each other. A distance of 70 m was defined as a stable communication distance for the 2.4GHz in-field WSN applications. Four models were developed to predict the path-loss based on the log of T-R distance, transmitter and receiver heights under conditions of clear line-of-sight, and three different plant canopy heights, respectively. R2 of the models were 0.601, 0.599, 0.674 and 0.776. Their standard errors of the estimate were 3.761, 3.199 3.518, 2.889, respectively.