174 research outputs found
Special Issue on Amateur Drone and UAV Communications and Networks
No full textThe development of the mini-drones, formally called unmanned air vehicles (UAVs) have captured the attention of hobbyists and the investors due to their enormous applications. Drones have endless commercial applications as well due to the irrelatively small size and ability to fly without an on-board pilot such as in agriculture, photography, surveillance, and numerous public services. The use of drones for achieving high speed wireless communication is one of the most significant applications for next generation communication system (5G). Indeed, drone-based communication network offers encouraging solution to provide wireless connectivity for devices without infrastructure coverage due to e.g., severe shadowing by urban or mountainous terrain, or damage to the communication infrastructure caused by natural disasters.
UAV-Empowered Disaster-Resilient Edge Architecture for Delay-Sensitive Communication
No full textThe 5G communication systems will enable enhanced mobile broadband, ultra-reliable low-latency, and massive connectivity services. Broadband and low-latency services are indispensable to public safety (PS) communication during natural or man-made disasters. Recently, 3GPP-LTE has emerged as a promising candidate to enable broadband PS communications. In this article, first we present six major PS-LTE enabling services and the current status of PS-LTE in 3GPP releases. Then, we discuss the spectrum bands allocated for PS-LTE in major countries by ITU. Finally, we propose a disaster resilient three-layered architecture for PS-LTE (DR-PSLTE). This architecture consists of an SDN layer to provide centralized control, UAV cloudlet layer to facilitate edge computing or to enable the emergency communication link, and a radio access layer. The proposed architecture is flexible and combines the benefits of SDNs and edge computing to efficiently meet the delay requirements of various PS-LTE services. Numerical results verified that under the proposed DR-PSLTE architecture, delay is reduced by 20 percent as compared with the conventional centralized computing architecture
QoS priority-based coordinated scheduling and hybrid spectrum access for femtocells in dense cooperative 5G cellular networks
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Computational methods for physiological data
No full textThesis (Ph. D.)--Harvard-MIT Division of Health Sciences and Technology, 2009.Author is also affiliated with the MIT Dept. of Electrical Engineering and Computer Science. Cataloged from PDF version of thesis.Includes bibliographical references (p. 177-188).Large volumes of continuous waveform data are now collected in hospitals. These datasets provide an opportunity to advance medical care, by capturing rare or subtle phenomena associated with specific medical conditions, and by providing fresh insights into disease dynamics over long time scales. We describe how progress in medicine can be accelerated through the use of sophisticated computational methods for the structured analysis of large multi-patient, multi-signal datasets. We propose two new approaches, morphologic variability (MV) and physiological symbolic analysis, for the analysis of continuous long-term signals. MV studies subtle micro-level variations in the shape of physiological signals over long periods. These variations, which are often widely considered to be noise, can contain important information about the state of the underlying system. Symbolic analysis studies the macro-level information in signals by abstracting them into symbolic sequences. Converting continuous waveforms into symbolic sequences facilitates the development of efficient algorithms to discover high risk patterns and patients who are outliers in a population. We apply our methods to the clinical challenge of identifying patients at high risk of cardiovascular mortality (almost 30% of all deaths worldwide each year). When evaluated on ECG data from over 4,500 patients, high MV was strongly associated with both cardiovascular death and sudden cardiac death. MV was a better predictor of these events than other ECG-based metrics. Furthermore, these results were independent of information in echocardiography, clinical characteristics, and biomarkers.(cont.) Our symbolic analysis techniques also identified groups of patients exhibiting a varying risk of adverse outcomes. One group, with a particular set of symbolic characteristics, showed a 23 fold increased risk of death in the months following a mild heart attack, while another exhibited a 5 fold increased risk of future heart attacks.by Zeeshan Hassan Syed.Ph.D
Amateur Drone Monitoring: State-of-the-Art Architectures, Key Enabling Technologies, and Future Research Directions
No full textGene expression patterns of encapsulated microbial cells
No full textTo design hybrid cellular/synthetic devices such as sensors and vaccines, understanding of how the metabolic state of living cells changes upon physical confinement within three-dimensional matrices is vital. We analyze the gene expression patterns of stationary phase Saccharomyces cerevisiae (S. cerevisiae) cells encapsulated within three distinct nanostructured silica matrices and relate those patterns to known naturally occurring metabolic states. It was found that the cells for all three-encapsulated methods enter quiescent states characteristic of response to stress, albeit to different degrees and with differences in detail. By the measure of enrichment of stress-related Gene Ontology categories, we find that the AqS+g encapsulation more amenable to the cells than CDA and SD encapsulation. We hypothesize that this differential response in the AqS+g encapsulation is related to four properties of the encapsulating gel: 1) oxygen permeability, 2) relative softness of the material, 3) development of a protective sheath around individual cells, and 4) the presence of glycerol in the gel, which has been previously noted to serve as a protectant for encapsulated cells and can serve as the sole carbon source for S. cerevisiae under aerobic conditions. This work represents a combination of experiment and analysis aimed at the design and development of 3D encapsulation procedures to induce, and perhaps control, well-defined physiological behaviors.
We also report on the temporal pattern of yeast gene expression patterns during encapsulation in silica matrices via a cell-directed assembly process, and upon release. Three broad classes of patterns are seen. A major shift in expression patterns is seen upon encapsulation, relative to the beginning stationary state, similar to previously reported stress response. Significant continuing shifts are seen by sampling at different intervals during a one week encapsulation. Upon release from encapsulation and reincubation in growth medium, the cells are in a state significantly different from the state prior to encapsulation and similar to the state during encapsulation. Implications are drawn for the use of encapsulated micro-organism as sensors and effectors, and for the persister state of such organisms.
Ordinarily Gene Ontology (GO) enrichment analysis is subject to an arbitrary threshold for defining significance of enriched classes. In this paper, we consider replacing an arbitrary threshold with F-measure optimization to define the p-value that divides “significant enrichment” from “non-significant”. It is found that evaluation of false negatives (essential for computing recall and thus F-measure) requires a heuristic (but reasonable) assumption. We apply F-measure optimization to two sets of genes from different organisms and use Benjamini-Hochberg and random resampling to evaluate the number of false positives. It is found that the uncorrected p- value that produces optimum F-measure varies widely from one data set to another. It is also found that all three methods of FDR calculation diverge from each other within a range of uncorrected p-values that provide F-measure optimum p-values. This study includes in Appendix II a pipeline for using resampling and F-measure optimization to create lists of enriched GO classes that provide for variable weights of precision and recall.Submission published under a 24 month embargo labeled 'Closed Access', the embargo will last until 2019-12-01The student, Zeeshan Fazal, accepted the attached license on 2017-08-14 at 13:34.The student, Zeeshan Fazal, submitted this Dissertation for approval on 2017-08-14 at 13:40.This Dissertation was approved for publication on 2017-08-16 at 15:26.DSpace SAF Submission Ingestion Package generated from Vireo submission #11597 on 2018-03-13 at 10:32:05Made available in DSpace on 2018-03-13T17:28:57Z (GMT). No. of bitstreams: 5
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Revealing the quasiparticle electronic and excitonic nature in cubic, tetragonal, and hexagonal phases of FAPbI3
No full textThe development of three-dimensional (3D) hybrid organic-inorganic perovskites has sparked much interest because of their rich light-harvesting capabilities in solar cells. However, the understanding of the electronic and optical properties, particularly the excitonic shifts upon structural phase transition with temperature in these materials, is not fully clear. Here, we report the accurate description of electronic and optical properties of mostly studied FAPbI(3) across the cubic-tetragonal-hexagonal phases, using the relativistic GW method and Bethe-Salpeter Equation (BSE), including the spin-orbit coupling effects. Our GW calculations reveal that the bandgap values vary from 1.47 to 3.54 eV from the room temperature cubic phase to the low temperature hexagonal phase. Our optical analysis shows that excitonic peaks are blue-shifted, and exciton binding energies estimated by the model BSE approach increase from 74 to 567 meV going from the cubic to hexagonal phases. Our results may have important impacts on the practical uptake of hybrid perovskite based solar cells under different climatic conditions. (c) 2022 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license(http://creativecommons.org/licenses/by/4.0/)
A Comparative Analysis on Appraisal of Two Texts Exposing the Controversy of Sex Education Given in US Public Schools (Based on Systemic Functional Linguistics Study)
No full textThis research attempts to find out the attitudes employed in the texts of contributor opinion exposing the controversy of sex education given in US public schools, to find out the influence of the attitudes toward the texts and to find out why the attitudes are employed in the texts. This research applied qualitative descriptive method with total sampling technique. This research also used primary and secondary data. The primary data of this research consist of detail and depth linguistic phenomena about the types of attitudes: affect (people’s feeling), judgment (people’s character), and appreciation (evaluating things) taken from the two texts. Meanwhile, the secondary data consist of the information about the sex education given in schools and the texts’ writers.
The data and source of data of this research were two texts of contributor opinion column in Allvoices.com. The first text is entitled Sex Education: Does It Really Work? written by Hasnain and the second text is entitled Why Sex Education Should Be Taught In Schools? written by Zeeshan.
The results show that both texts apply the two same kinds of attitudes: judgment and appreciation. The first text is dominated by negative attitudes, consisting of 46% negative appreciation, 27% positive appreciation, 17% negative judgment, and 10% positive judgment. Meanwhile, the second text is dominated by positive attitudes consisting of 48% positive appreciation, 15% negative appreciation, 18.5% positive judgment and 18.5% negative judgment. Moreover, both texts’ writers, Hasnain and Zeeshan, apply force: raise and focus: sharpening graduation with more than one voice (heterogloss).
The use of attitudes influences the text in term of register, prosody, genre and the ideology of the texts. In the level of register, the use of judgment and appreciation indicates that the language in both texts, in the clause level, is dominated by behavioral, carrier- attribute, and token-value. In the level of nominal group, epithet-thing is mostly exploited by the texts’ writers. This is because behavioral process, attribute, value, and epithet are potentials for developing judgment and appreciation. In the level of graduation, the use of dominant intensifier, attitudinal lexis, and quantification in both texts implies that the volume of attitudes is strong and sharp. In the case of engagement, the use of dominant projection (more than one voice) results in heterogloss. This means that both texts’ writers express their objectivity. In the case of prosody and relation to genre and ideology, text 1 applies negative attitudes in evaluating the issue, both positive and negative in argument for and against, and ended by positive attitudes for recommendation. Thus, Hasnain uses discussion genre in his text and leads into left- protagonist ideology. Meanwhile, text 2 written by Zeeshan employs positive attitudes for assessing the issue, starting from thesis until reiteration. That’s why, Zeeshan’s attitudes results in hortatory- exposition genre and brings into right-antagonist ideology.
This study also finds that both texts’ writers, Hasnain and Zeeshan, employ the attitudes: judgment and appreciation because they do not show their own feeling (affect) to evaluate the issue. They use judgment to assess the participants involved in the text, and apply appreciation to evaluate the issue of sex education in US. Both texts’ writers employ force: raise and focus: sharpening with more than one voice (heterogloss) in their attitudes because they express their objectivity in strong and sharp judgment and appreciation. The different point is that, as the educationalist, columnist, and the anchor Hasnain’s use of discussion genre and left- protagonist indicates that he did not just evaluate the issue but also the method of sex education in US. In this way he challenges the issue and supports the majority of US society to conduct AIDS education program as one of the policies related to what kind of sex education should be taught in schools (sex education in the U.S.: policy and politics). Meanwhile, as the student and the stringer, Zeeshan’s use of hortatory- exposition genre and right- antagonist indicates that he just supports one-sidedly that sex education should be taught in schools. This is because schools provide reliable information and explanation about sex (Tatum and Alan Haris)
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