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Since the seriousness and urgency of climate change has surfaced during the last decade, researchers, experts, and even the pope have argued that dealing with it is a moral issue. However, emissions keep rising and it seems as if few people in the north are ready and willing to make any substantial lifestyle changes to minimize the potentially catastrophic consequences, mainly to the south. Intern
In this thesis we study efficient solvers for space-time discontinuous Galerkin spectral element methods (DG-SEM). These discretizations result in fully implicit schemes of variable order in both spatial and temporal directions. The popularity of space-time DG methods has increased in recent years and entropy stable space-time DG-SEM have been constructed for conservation laws, making them interes
Previous research has shown that sustainable improvements need incentives to carry them through. An assumption is that it may be easier to incorporatesustainable thinking in an organization if the organization understandswhich actions it is that are having a positive effect on sustainability andon tangible costs. This paper aims to highlight the synergy effects thatoccur in the intersection betwee
Microsoft Word - Gohar Astvatsatryan.doc Gohar Astvatsatryan Master Thesis LUMES 1998/99 1 Lund, Sweden TABLE OF CONTENT ABSTRACT……………………………………………………………………………. 3 ACRONYMS ………………………………………………………………………….. 3 CHAPTER I: INTRODUCTION………………………………………………… 4 1.1. BACKGROUND: TOURISM AND SUSTAINABLE DEVELOPMENT……….. 4 1.2. GOALS AND OBJECTIVES…………………………………..………………… 5 1.3. SCOPE AND LIMITATIONS………………………………………
https://www.lumes.lu.se/sites/lumes.lu.se/files/astvatsatryan_gohar.pdf - 2026-07-17
Power and energy consumption, today essential in all types of systems, can be reduced by scaling the voltage/frequency at runtime and/or powering down idle components. Efficient management requires not only pertinent decisions, but also early access to workload information, as well as domain specific solutions. This paper focuses on runtime energy management for streaming applications running on m
Discontinuous Reception (DRX) has been included in 4G-LTE as the main power saving mechanism for User Equipment (UE). However, the existing 3-state DRX model is not sufficient for new use cases introduced by 4G and 5G. For example, the device discovery process in Device to Device (D2D) communication has a significant impact on delay and power consumption, but the existing conventional 3-state DRX
IoT networks are getting overcrowded following the vast increase in number of Internet-of-Things (IoT) devices and connections. Networks can be extended with more gateways, increasing the number of supported devices. However, as investigated in this work, massive MIMO has the potential to increase the number of simultaneous connections and moreover lower the energy expenditure of these devices. We
Abstract in UndeterminedPower efficiency has become the most important consideration for many modern computing devices. In this paper, we examine power efficiency of a range of graphics algorithms on different GPUs. To measure power consumption, we have built a power measuring device that samples currents at a high frequency. Comparing power efficiency of different graphics algorithms is done by m
Microsoft Word - DAUGHERTY_MSc Full THESIS.doc Lund University International Master’s Programme In Environmental Science M.Sc. (LUMES) Biomass Energy Systems Efficiency: Analyzed through a Life Cycle Assessment Erik Christian Daugherty Master’s of Science Thesis Renewable Energy Analysis February 2001 _______________________________________________________________________________ Supervisor: Autho
https://www.lumes.lu.se/sites/lumes.lu.se/files/daugherty_erik.pdf - 2026-07-17
The current process of issuing industrial and mineral licenses is complex and time consuming. More specific, industry establishment generally makes environmental pollution. Such negative impact on environment is due to not using proper information and mechanisms for site selection and license issuance. This research suggests a new process/method based on WebGIS enable e-government to simplify the
The exponential growth of converging technologies, including augmented reality, autonomous vehicles, machine-to-machine and machine-to-human interactions, biomedical and environmental sensory systems, and artificial intelligence, is driving the need for robust infrastructural systems capable of handling vast data volumes between end users and service providers. This demand has prompted a significa
We introduce a novel approach for energy-efficient scheduling of data-dependent stream programs with packet types on multicore architectures with voltage and frequency scaling. To have the given application meet specific throughput demands while minimizing energy consumption, we enhance the existing crown scheduling by packet-type dependent parameters. Formulation as an integer linear program gene
Many computing systems are constrained by power budgets. While they could temporarily draw more power, doing so creates unsustainable temperatures and unwanted electricity consumption. Developing systems that operate within power budgets is a constrained optimization problem: configuring the components within the system to maximize performance while maintaining sustainable power consumption. This
A number of techniques have been proposed to provide run- time performance guarantees while minimizing power consumption. One drawback of existing approaches is that they work only on a fixed set of components (or actuators) that must be specified at design time. If new components become available, these management systems must be redesigned and reimplemented. In this paper, we propose PTRADE, a n
Constraining the temperature of computing systems has become a dominant design aspect. The supply voltage decrease has lost its pace even though the feature size is shrinking constantly. This results in an increased number of transistors per unit of area and hence a growing power density. Researchers started investigating dynamic thermal management techniques to trade-off performance for energy co
Aquifers and groundwater-dependent ecosystems (GDEs) are facing increasing pressure from water consumption, irrigation and climate change. These pressures modify groundwater levels and their temporal patterns and threaten vital ecosystem services such as arable land irrigation and ecosystem water requirements, especially during droughts. This review examines climate change effects on groundwater a
Many modern software applications have performance requirements, like mobile and embedded systems that must keep up with sensor data, or web services that must return results to users within an acceptable latency bound. For such applications, the goal is not to run as fast as possible, but to meet their performance requirements with minimal resource usage, the key resource in most systems being en
Driven by the increasing demands on data rate from applications, the wireless communication standard has for decades been evolving approximately at a pace of one generation per ten years. Following this trend, the ambitious plan to replace the current cellular mobile network standard (4G) with the next generation standard (5G) is going through the standardization phase and is getting close to its
This work presents a 2.0mm2 128×16 massive MIMO detector IC that provides 21dB array gain and 16x multiplexing gain at the system level. The detector implements iterative expectation-propagation detection (EPD) for up to 256-QAM modulation. Tested with measured channel data [1], the detector achieves 4.3dB processing gain over state-of-the-art massive MlMo detectors [2, 3], enabling 2.7x reduction
Time synchronization is crucial for wireless sensor networks (WSNs), where operations often rely on time ordering of events. WSNs are deployed in different scenarios, and therefore their timing requirements are often related to the peculiar characteristics of the specific environment they have to act in. Synchronization is anyway always an issue: transactional applications need monotonicity of the
