Theses and Dissertations

Permanent URI for this collectionhttp://ir.daiict.ac.in/handle/123456789/1

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Now showing 1 - 5 of 5
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    Precision agriculture using wireless sensor network
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2015) Joshi, Nikita Rajeshbhai; Shrivastava, Sanjay
    Farming practices should evolve with the rapid increase in population. Recent growth in wireless sensor network (WSN) has the capability to meet this objective. Better quality in crop production can be achieved using real-time data collected through WSN. Also, greenhouse allows farming in a controlled environment. Hence, a combination of WSN and greenhouse gives better quality crop yield. Greenhouse requires climate control and fertigation management. Fertigation is a combination of irrigation and fertilization. Existing architectures for greenhouse management collect data of various parameters using sensor nodes and control values of parameters using actuators. These architectures have very limited capability to handle faults in sensors and actuators. Deployment of sensor nodes in these architectures is crop dependent. Therefore, while changing crops, modifications in the location of sensor node is needed and details of this modification should be entered manually in the database. Thus, they are not flexible architectures. In our work, a WSN based architecture for controlled environment like greenhouse is designed. This architecture provides for actuator control using crop requirements stored in the database. The architecture provides for deployment strategies for sensor nodes and actuators using the details about bed size, crop requirements etc. Localization algorithm is used to find the exact location of the sensor node. The architecture is flexible such that whenever location of sensors nodes needs to be changed, location of sensor nodes will be automatically detected using the localization algorithm. We have designed an algorithm to detect faults in sensor nodes and actuators. These faults are isolated or reported to the user. The architecture provides for network management strategies to control energy consumption of sensor nodes which eventually helps in increasing network lifetime. WSN algorithms for sleep scheduling and localization are used to support these features.We designed a system for a specific group of crops namely tomato, capsicum and cucumber using the architecture. This system is simulated in NS2 and it is verified that system is working as expected.
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    Radiation analysis of microstrip active (amplifier) and passive (antenna) structures
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2010) Dhoot, Vivek; Gupta, Sanjeev
    Analysis of radiation from a microstrip amplifier and a newly proposed microstrip antenna is presented. Microstrip amplifier is analyzed replacing the MMIC structure by an equivalent S2P model and remaining portion being constructed with the original dimensions. A printed monopole antenna using multifractal technique is proposed. This antenna has multiband characteristics covering various wireless applications including WLAN 2.4 GHz and 5.8 GHz applications
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    Statistical co-analysis, robust optimization and diagnosis of USB 2.0 system for signal and power integrity
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2009) Tripathi, Jai Narayan; Dubey, Rahul
    Signal Integrity (SI) and Power Integrity (PI) are the most critical issues as semiconductor industry is moving towards higher operational speeds. Signal integrity and power integrity are such issues that should be looked at system level rather than looking at active and passive networks separately. System level analysis becomes a necessity when the individual subsystems work according to specifications, and even after that complete system doesn't work well. System level signal integrity and power integrity problems for high speed serial links have been taken into account in this thesis. Serial links are being used more and more rather than parallel links due to lesser skew and lower pin counts. Specifically USB 2.0 IP is used for this thesis work, but the analysis is generic for all serial links. This thesis considers SI and PI as a dual and a common model is used which considers both SI and PI. A statistical co-analysis of SI and PI for high speed serial links is used, which can be used for a cost effective solution too. Statistical methods are used for efficient simulations and to extract maximum information contents in the least simulation combinations. Based on this co-analysis, the system is diagnosed or modified for better SI and PI. In the end, reflection gain concept is also taken in to account for the diagnosis of the system. All in all, USB 2.0 system is diagnosed for better SI and PI. System level robustness analysis of high speed serial links are taken into account with effect of external environment. A strong correlation between measured and simulated results is shown. A generic methodology for SI and PI for high speed serial links is presented with complete analysis of package, board, termination, squidd card, decoupling network etc..
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    Analysis and modeling of power distribution network and decoupling network design strategies for high speed digital and analog VLSI system
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2009) Pathak, Abhishek; Mandal, Sushanta; Nagpal, Raj Kumar; Nagchoudhuri, Dipankar
    Today’s high speed digital and analog VLSI systems are operating in GHz frequency range. With high switching rate of the devices, power distribution network (PDN) impedance causes ripples in power supply. If PDN is not designed properly it can cause false switching, or even it can damage the device permanently. In this thesis whole power distribution network (PDN) for VLSI system has been modeled using RLC equivalent circuits which can be run on any simulation program with integrated circuit emphasis (SPICE) based simulator. Frequency dependent RLC model for printed circuit board (PCB) and package interconnects has been generated, and effects of different geometry and material of interconnects on PDN impedance profile have been analyzed. Model is compared with electromagnetic (EM) full wave simulator both for the accuracy and CPU run time and it is found that model shows good accuracy with very less CPU run time as compared to full wave simulator which can take more than a day to simulate whole geometry. To meet the target impedance of PDN, Strategies for choosing decoupling capacitors and their placement over power plane have been analyzed. Key-words: Power Integrity, power delivery network, voltage regulator, simultaneous switching noise.
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    Service selection using WS-agreement
    (Dhirubhai Ambani Institute of Information and Communication Technology, 2008) Chudasma, Nrupen; Chaudhary, Sanjay
    The business requirements are dynamic in nature and identification of suitable busi- ness partners "on demand", who can satisfy a set of guarantees is a critical process. Selection of business partners is influenced by several parameters including maximizing profit, minimizing cost, reliability, credit history, etc. A business process can be decomposed into several tasks, possibly expressed as Web services implementing desired business functionalities. Each service offers a set of guarantees, each defining a Service Level Objective(SLO). Many service providers may provide the similar business functionality in the form of service with different SLOs. Thus it is necessary to select the service offered by service partner such that overall performance of the process is improved. The thesis proposes architecture for solving selection of the best service provided by available service partners. To put across our approach, the thesis has taken examples from the Agro-Produce marketing System. By specifying requirements of the service in the form of multiple service level objectives (SLOs), selection of a service provider can be achieved based on the best or optimal matching of SLOs of service consumer and providers. A set of services, SLOs, and participating actors constitute a Service Level Agreement (SLA). In this work, WS-Agreement specification is used to specify the SLA. For flexible selection, role of semantic web concepts such as ontology and semantic rule language is discussed. The service partner must comply with the multiple criteria and preferences of a requester, Multi Criteria Decision Making (MCDM) methods is required in the service selection process. Two scenarios for service selection from Agro-Produce market system are taken. One is single service selection where selection of sellers selling mangos are selected based on the best seller offered. Second one is related to service composition where more than two services need to be selected, such that overall process performance is improved. The scenario is from rice production process where selection of farmer, rice-miller, storage provider and transporter contribute to overall cost, quantity and quality of rice.