Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 24 for “"Sleep mode"”.
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A Two-Mode Synchronous Buck Converter for Low-Power Devices with the Sleep Mode
… the most time of the smart camera works in the sleep mode. Hence the light load efficiency is important in this application, however, conventional buck converter usually have high efficiency at heavy load but poor efficiency at light load. To increase the light load efficiency of buck converter, …
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An FPGA implementation of a sleep enabled PON system
… is to allow network elements to switch to the sleep mode. In this framework, an improved Optical network Unit (ONU) architecture in TDM-PON is proposed to reduce the handover time of status switching. Energy-saving performances of current and improved architectures are compared in different …
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Heterogeneity-aware and energy-aware scheduling and routing in wireless sensor networks
… that timeslot other sensor nodes are kept in sleep mode. A set of sensor nodes for a timeslot is chosen based on their positional information. In the routing phase, a least cost route from a sensor to the sink is dynamically determined to prolong the lifetime of the sensor network.
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Development of Structural Health Monitoring Systems Incorporating Acoustic Emission Detection for Spacecraft and Wind Turbine Blades
… acoustic events, while the SHM system is in sleep mode. The SHM system is evoked to perform the SHM operation only when there is an acoustic event detected by the acoustic emission sensor. The proposed system avoids unnecessary operation of SHM operations, which saves power, and the system is …
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Modelling and simulation of wireless information and power exchange protocol with power splitting for energy sustainability in device-to-device communications
… are not sending any message, they can go into sleep mode to save energy. The nodes only wake up when they want to send or communicate with other nodes. In this study, the RF energy harvesting technology was used to power-ups all the wireless sensor nodes wirelessly. At the end of the research, …
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Energy efficient operating systems and software
… Portable systems spend a lot of time in sleep mode. Idle power management strategies have been developed that consider the effect of leakage and duty-cycle on system lifetime. A hierarchical shutdown approach for systems characterized multiple sleep states has been proposed. Although the …
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A Two-Phase Buck Converter with Optimum Phase Selection for Low Power Applications
… of smart cameras varies significantly between sleep mode and active mode, and a smart camera operates in sleep mode for 80 — 90% of time for typical use. To prolong the battery life of smart cameras, it is essential to increase the power converter efficiency for light load, while being able to …
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A Reconfigurable Digital-to-Analog Converter with Supply Invariant Linearity
… using static CMOS logic and the inclusion of a "sleep mode" in the analog core which can be used after the desired output is achieved. This design was implemented across two different processes with different power supplies to confirm the architecture.</p>
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Sudden-event monitoring of civil infrastructure using wireless smart sensors
… onset of events when they are in power-saving sleep mode; (2) the wireless communication throughput is strictly limited, so time-consuming data transmission can result in large delay for subsequent damage assessment; (3) sensor malfunction often occurs in wireless monitoring systems, so the …
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Energy-Efficient Self-Organization Protocols for Sensor Networks
… the longevity of the WSN sensors, which are in sleep mode most of the time. (2) Adaptivity: the infrastructure is adaptive to network size, network topology, network density and application requirement. (3) Robustness: the degree to which the infrastructure is robust and resilient. Analytical …
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Software-Defined Mobility Management and Base Station Control for Green Cellular Networks
… architecture that can effectively control the sleep and awake modes of base stations and perform handover operations in a cellular network. It provides significant benefits over current cellular networks that suffer from inflexible management and complex control. Our extensive trace-driven …
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Radon, progeny and health: investigation in different environments in Northamptonshire
… for the amount delivered to above-ground-floor sleepers, and the much reduced level of intake to the respiratory system from reduced breathing rate during the sleep mode. Potentially also, from the mechanism postulated which implies the limitation of the impact of alpha particles, related to an …
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On greening optical access networks
… ONUs changes dynamically, properly defining the sleep mode for idle ONUs can potentially save a significant amount of energy. However, it is challenging to shut down an ONU receiver as the ONU needs to receive some downstream control packets to perform upstream transmission. In this framework, a …
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Ultra-low energy electronics for synthetic biological sensors
… source for waking the ingestible sensor from sleep mode and for running slow analog measurements. The core oscillator uses an 18-transistor 3-stage architecture designed to minimize short circuit current and consumes only switching energy across a wide range of Vdd. At 0.6 V, the oscillator …
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Energy Efficient Resource Allocation for Virtual Network Services with Dynamic Workload in Cloud Data Centers
… few physical nodes and switch the idle nodes to sleep mode. Especially, with the advent of live migration, a virtual node can be moved from one physical node to another physical node without service disrup tion. It is possible to save more energy by shrinking virtual nodes to a small set of …
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Power Management and Power Conditioning Integrated Circuits for Near-Field Wireless Power Transfer
… core remains active when the WPT receivers enter sleep mode to prolong the battery usage time. In the final part of this study, a nano-watt high-accuracy temperature sensing core is implemented in a 0.18µm 1.8V/3.3V CMOS process that can self-compensate the temperature shift without the need for …
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Wake-up Radio based Approach to Low-Power and Low-Latency Communication in the Internet of Things
… improvements by putting the main transceiver in sleep mode for extended periods. However, the sensor nodes still waste energy due to two main issues. First, the nodes periodically wake-up to sample the channel even when there is no data for it to receive, leading to idle listening cost. On the …
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Improving energy efficiency and quality of service in an integrated wireless-optical broadband access network
… hindering QoS. While these technologies both use sleep mode, they differ in their power saving mechanisms. This thesis first addresses a QoS solution for the incompatibility between these technologies. Service class mapping is proposed in Chapter 3 for the integrated WOBAN, based on the M/G/1 …
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Low power circuits and systems for wireless neural stimulation
… from a 5 mAh battery, extended by an automatic sleep mode that reduces standby power consumption by 2.5x. To test this device, bipolar stimulating electrodes were implanted into the songbird motor nucleus HVC of zebra finches. Single-neuron recordings revealed that wireless stimulation of HVC …
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Image compression and energy harvesting for energy constrained sensors
… sensor can harvest energy in between frames, in sleep mode, and even when it is taking images. When sensing images and harvesting energy are both needed at the same time, some pixels have to work as sensing pixels, and the others have to work as solar cells. Since some pixels are devoted to …
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