Achieving Reliable and Sustainable Next-Generation Memories

Conventional memory technology scaling has introduced reliability challenges due to dysfunctional, improperly formed cells and crosstalk from increased cell proximity. Furthermore, as the manufacturing effort becomes increasingly complex due to these deeply scaled technologies, holistic sustainability is negatively impacted. The development of new memory technologies can help overcome the capacitor scaling limitations of DRAM. However, these technologies have their own reliability concerns, such as limited write endurance in the case of Phase Change Memories (PCM). Moreover, emerging system requirements, such as in-memory encryption to protect sensitive or private data and operation in harsh environments create additional challenges that must be addressed in the context of reliability and sustainability. This dissertation provides new multifactor and ultimately unified solutions to address many of these concerns in the same system. In particular, my contributions toward mitigating these issues are as follows. I present GreenChip and GreenAsic, which together provide the first tools to holistically evaluate new computer architecture, chip, and memory design concepts for sustainability. These tools provide detailed estimates of manufacturing and operational-phase metrics for different computing workloads and deployment scenarios. Using GreenChip, I examined existing DRAM reliability techniques in the context of their holistic sustainability impact, including my own technique to mitigate bitline crosstalk. For PCM, I provided a new reliability technique with no additional storage overhead that substantially increases the lifetime of an encrypted memory system. To provide bit-level error correction, I developed compact linked-list and Bloom-filter-based bit-level fault map structures, that provide unprecedented levels of error tabulation, combined with my own novel error correction and lifetime extension approaches based on these maps for less area than traditional ECC. In particular, FaME, can correct N faults using N bits when utilizing a bit-level fault map. For operation in harsh environments, I created a triple modular redundancy (TMR) pointer-based fault map, HOTH, which specifically protects cells shown to be weak to radiation. Finally, to combine the analyses of holistic sustainability and memory lifetime, I created the LARS technique, which adjusts the GreenChip indifference analysis to account for the additional sustainability benefit provided by increased reliability and lifetime

Adapting to Expanding and Contracting Cities, Book of Abstracts, 6th Fabos Conference on Landscape and Greenway Planning, March 28-30, 2019, Amherst, MA.

The Fábos Conference on Landscape and Greenway Planning is held every three years to bring together experts who are influencing landscape planning, policy making and greenway planning from the local to international level. It is intended to highlight recent trends and expand the literature about landscape and greenway planning. The aim is to explore how landscape architects and planners from different countries have approached greenway planning and to understand how greenways have been tailored to each county’s unique geographical, cultural, and political circumstances. The theme for the 2019 conference, Urban Greenway Planning: Adapting to Expanding and Contracting Cities, explores the social and ecological potential of linear green spaces in urban areas that are experiencing decline or those that are booming. We look to understand the variety of ways in which urban greenways are conceived, designed, built, used, and maintained in cities across the globe in response to economic and demographic trends

Special Topics in Information Technology

This open access book presents thirteen outstanding doctoral dissertations in Information Technology from the Department of Electronics, Information and Bioengineering, Politecnico di Milano, Italy. Information Technology has always been highly interdisciplinary, as many aspects have to be considered in IT systems. The doctoral studies program in IT at Politecnico di Milano emphasizes this interdisciplinary nature, which is becoming more and more important in recent technological advances, in collaborative projects, and in the education of young researchers. Accordingly, the focus of advanced research is on pursuing a rigorous approach to specific research topics starting from a broad background in various areas of Information Technology, especially Computer Science and Engineering, Electronics, Systems and Control, and Telecommunications. Each year, more than 50 PhDs graduate from the program. This book gathers the outcomes of the thirteen best theses defended in 2020-21 and selected for the IT PhD Award. Each of the authors provides a chapter summarizing his/her findings, including an introduction, description of methods, main achievements and future work on the topic. Hence, the book provides a cutting-edge overview of the latest research trends in Information Technology at Politecnico di Milano, presented in an easy-to-read format that will also appeal to non-specialists

Special Topics in Information Technology

This open access book presents thirteen outstanding doctoral dissertations in Information Technology from the Department of Electronics, Information and Bioengineering, Politecnico di Milano, Italy. Information Technology has always been highly interdisciplinary, as many aspects have to be considered in IT systems. The doctoral studies program in IT at Politecnico di Milano emphasizes this interdisciplinary nature, which is becoming more and more important in recent technological advances, in collaborative projects, and in the education of young researchers. Accordingly, the focus of advanced research is on pursuing a rigorous approach to specific research topics starting from a broad background in various areas of Information Technology, especially Computer Science and Engineering, Electronics, Systems and Control, and Telecommunications. Each year, more than 50 PhDs graduate from the program. This book gathers the outcomes of the thirteen best theses defended in 2020-21 and selected for the IT PhD Award. Each of the authors provides a chapter summarizing his/her findings, including an introduction, description of methods, main achievements and future work on the topic. Hence, the book provides a cutting-edge overview of the latest research trends in Information Technology at Politecnico di Milano, presented in an easy-to-read format that will also appeal to non-specialists

PHYSIOLOGICAL AND BIOCHEMICAL RESPONSES TO SALT AND CADMIUM STRESS AND IT’S AMELIORATION BY EXOGENOUS APPLICATION OF POLYAMINES IN HYBRID POPLAR (Populus nigra x maximowiczii, CLONE NM6)

The importance of nitrogen metabolism in plants in response to abiotic stress is widely known. Plant growth is severely hampered by abiotic stress, and appropriate nitrogen supply helps in plant growth and improves stress tolerance. At the same time, the regulation of nitrogen metabolism depends on the stress intensity. Abiotic stress can occur due to natural calamities, improper use of hazardous chemicals from industries, and careless environmental dumping of these chemicals. Hence, soils contaminated with hazardous chemicals are a significant threat to the development and yield of plants. Plants are affected by various abiotic stresses, i.e., salt, drought, and heavy metal stress. In the presence of these stresses, plants respond via complex mechanisms that include morphological, physiological, biochemical, and molecular changes. Small aliphatic amines like polyamines regulate plant growth and development, including plant metabolism. Polyamines like putrescine, spermidine, and spermine regulate several critical biochemical pathways, including the biosynthesis of amino acids and plant growth regulators. Under abiotic stress, polyamines protect plants from various detrimental effects. The interplay of polyamine and nitrogen is a critical factor in plant response to abiotic stress, as it connects nitrogen metabolism, carbon fixation, and other metabolic pathways. Some of these responses are short-lived and others long-term, affecting not only the physiology but also growth and biomass. However, little information about how polyamines interact with plants to maintain normal growth in response to abiotic stress is available. So, it is essential to investigate the biochemical responses in cellular polyamines and amino acids in abiotic stress. The goal of the study was to understand the physiological and biochemical effects of salt and cadmium, and their interactions with polyamines sprayed on the leaves in Populus nigra x maximowiczii, (clone NM6) young plants. The two specific objectives of the study were: (1) to analyze the effects of two concentrations of NaCl on the physiology and biochemistry of poplar NM6 plants and potential mitigation of these effects by spray with putrescine; and (2) to analyze the effects of two concentrations of cadmium chloride on the physiology and biochemistry of poplar NM6 plants and potential mitigation of these effects by spray with spermidine. The results showed that plants had chlorosis, necrosis, slower growth because of abiotic stress. Exogenous putrescine application increased gas exchange & altered several metabolites under salt stress. The results also suggest a close relationship between amino acids, polyamines, and phytochelatins and their involvement in the cadmium detoxification mechanisms. Finally, it can be said that timely applications of exogenous spermidine via foliar spray could ameliorate the adverse effect of heavy metal stress in poplar NM6 plants. In conclusion, overall finding addressed multi-dimensional effect of the foliar spray of polyamines on poplar NM6 plants in response to abiotic stress

Design Development Test and Evaluation (DDT and E) Considerations for Safe and Reliable Human Rated Spacecraft Systems

A team directed by the NASA Engineering and Safety Center (NESC) collected methodologies for how best to develop safe and reliable human rated systems and how to identify the drivers that provide the basis for assessing safety and reliability. The team also identified techniques, methodologies, and best practices to assure that NASA can develop safe and reliable human rated systems. The results are drawn from a wide variety of resources, from experts involved with the space program since its inception to the best-practices espoused in contemporary engineering doctrine. This report focuses on safety and reliability considerations and does not duplicate or update any existing references. Neither does it intend to replace existing standards and policy

Modern meat: the next generation of meat from cells

Modern Meat is the first textbook on cultivated meat, with contributions from over 100 experts within the cultivated meat community. The Sections of Modern Meat comprise 5 broad categories of cultivated meat: Context, Impact, Science, Society, and World. The 19 chapters of Modern Meat, spread across these 5 sections, provide detailed entries on cultivated meat. They extensively tour a range of topics including the impact of cultivated meat on humans and animals, the bioprocess of cultivated meat production, how cultivated meat may become a food option in Space and on Mars, and how cultivated meat may impact the economy, culture, and tradition of Asia

State-of-the-Art Sensors Technology in Spain 2015: Volume 1

This book provides a comprehensive overview of state-of-the-art sensors technology in specific leading areas. Industrial researchers, engineers and professionals can find information on the most advanced technologies and developments, together with data processing. Further research covers specific devices and technologies that capture and distribute data to be processed by applying dedicated techniques or procedures, which is where sensors play the most important role. The book provides insights and solutions for different problems covering a broad spectrum of possibilities, thanks to a set of applications and solutions based on sensory technologies. Topics include: • Signal analysis for spectral power • 3D precise measurements • Electromagnetic propagation • Drugs detection • e-health environments based on social sensor networks • Robots in wireless environments, navigation, teleoperation, object grasping, demining • Wireless sensor networks • Industrial IoT • Insights in smart cities • Voice recognition • FPGA interfaces • Flight mill device for measurements on insects • Optical systems: UV, LEDs, lasers, fiber optics • Machine vision • Power dissipation • Liquid level in fuel tanks • Parabolic solar tracker • Force sensors • Control for a twin roto