Adaptive Compressed Sensing for Support Recovery of Structured Sparse Sets

This paper investigates the problem of recovering the support of structured signals via adaptive compressive sensing. We examine several classes of structured support sets, and characterize the fundamental limits of accurately recovering such sets through compressive measurements, while simultaneously providing adaptive support recovery protocols that perform near optimally for these classes. We show that by adaptively designing the sensing matrix we can attain significant performance gains over non-adaptive protocols. These gains arise from the fact that adaptive sensing can: (i) better mitigate the effects of noise, and (ii) better capitalize on the structure of the support sets.Comment: to appear in IEEE Transactions on Information Theor

Adaptive Sensing for Estimation of Structured Sparse Signals

In many practical settings one can sequentially and adaptively guide the collection of future data, based on information extracted from data collected previously. These sequential data collection procedures are known by different names, such as sequential experimental design, active learning or adaptive sensing/sampling. The intricate relation between data analysis and acquisition in adaptive sensing paradigms can be extremely powerful, and often allows for reliable signal estimation and detection in situations where non-adaptive sensing would fail dramatically. In this work we investigate the problem of estimating the support of a structured sparse signal from coordinate-wise observations under the adaptive sensing paradigm. We present a general procedure for support set estimation that is optimal in a variety of cases and shows that through the use of adaptive sensing one can: (i) mitigate the effect of observation noise when compared to non-adaptive sensing and, (ii) capitalize on structural information to a much larger extent than possible with non-adaptive sensing. In addition to a general procedure to perform adaptive sensing in structured settings we present both performance upper bounds, and corresponding lower bounds for both sensing paradigms

Pemanfaatan Solar Cell Sebagai Alternatif Energi Listrik Skala Rumah Tangga

Indonesia merupakan negara yang memiliki berbagai jenis sumber daya energi dalam jumlah yang cukup melimpah. Letak Indonesia berada pada daerah katulistiwa, maka wilayah Indonesia akan selalu disinari matahari selama 10 sampai dengan 12 jam dalam sehari. Indonesia sebagai Negara tropis memiliki potensi pengembangan dan pemanfaatan energy surya sebagai salah satu dari banyak system konversi energy surya, system konversi energy surya ini dapat diterapkan untuk mengatasi semakin menipisnya cadangan bahan bakar konvensional yang ada. Data Ditjen Listrik dan Pengembangan Energi pada tahun 1997, kapasitas terpasang listrik tenaga surya di Indonesia mencapai 0,88 MW dari potensi yang tersedia 1,2 x 109 MW. Sel surya jenis monokristal (monocrystalline)merupakan panel yang paling efisien, menghasilkan daya listrik persatuan luas yang paling tinggi. Memiliki efisiensi sampai dengan 15%. Kelemahan dari panel jenis ini adalah tidak akan berfungsi baik ditempat yang cahaya mataharinya kurang (teduh), efisiensinya akan turun drastis dalam cuaca berawan. Photovoltaic cell selalu dilapisi oleh penutup yang berasal dari gelas. Seperti barang dari gelas lainnya, maka optical input dari photovoltaic cell juga sangat dipengaruhi oleh orientasinya terhadap matahari karena variasi sudut dari pantulan gela

Parametrization of gamma-ray production cross-sections for pp interactions in a broad proton energy range from the kinematic threshold to PeV energies

Using publicly available Monte Carlo codes as well as compilation of published data on p--p interactions for proton kinetic energy below 2 GeV, we parametrize the energy spectra and production rates of $\gamma$-rays by simple but quite accurate ($\leq 20 \%$) analytical expressions in a broad range from the kinematic threshold to PeV energies.Comment: 19 pages, 15 figures, v2 version fixes the cross reference

Microcanonical analysis of the kinetic method. The meaning of the “apparent entropy”

AbstractA rigorous analysis of the kinetic method is carried out using Rice-Ramsperger-Kassel-Marcus (RRKM) theory of microcanonical statistical unimolecular dissociation rates. The model employs a kinetics treatment appropriate for metastable ion dissociation. Proton-bound alkoxide dimer anions are used as model systems, with realistic vibrational and rotational parameters calculated by ab initio methods for the cluster ion and transition states leading to the competitive dissociation channels. The numerical simulations show that the kinetic method plots of ln(I2/I1) versus ΔΔH are nearly linear but can exhibit significant curvature. The apparent entropy obtained in the extended kinetic method is not approximately equal to the thermodynamic entropy difference for dissociation, ΔΔS(T), or for activation, ΔΔS‡(T), either at the effective temperature or at any fixed equilibrium temperature. Instead, the apparent entropy term can be related to the ratio of the microcanonical sum of states of the dissociation transition states for the kinetically selected internal energy of the dissociating ions

Conflicting Styles of Life in a Northern Canadian Town

Discusses observations made in Inuvik June-Oct 1966 as part of the Mackenzie Delta Research Project. The Delta natives find that the concentrated communities into which they are being relocated are transient-white oriented and dominated, lack connection with their former fishing-hunting-trapping economy. Indians, Eskimos, metis, northern-born whites and a few recently settled whites as a group have subordinate status to the transient whites who occupy the serviced area of Inuvik and maintain a separate socio-economic life style. The natives' difficulty of adjustment is attributed to their inherited culture with its values of indulgence and sharing, its derogation of conspicuous status-seeking, their habits of unscheduled work, independence, and general lack of job orientation resulting in absenteeism. The general frustration fosters heavy drinking at great social and economic cost, and the feeling of individual alienation. The economic and historical setting of the Delta region, population and age structure of its natives are dealt with, as are ethnic and life style factors in Inuvik. A town plan showing settlement patterns is included.Styles de vie en conflit dans une ville du nord du Canada. Avec la rapide expansion des services gouvernementaux dans l'Arctique canadien, les fonctionnaires blancs en sont venus à dominer la vie politique et sociale des villes nouvelles du nord. En réaction à cette pression, les indigènes commencent à se considérer comme faisant partie d'une nouvelle catégorie de "nordistes". Beaucoup des problèmes que ces nordistes éprouvent à s'ajuster à la vie urbaine peuvent être retracés jusque dans les valeurs et les schèmes de comportement propres à leur ancienne vie de trappeurs. La situation se complique encore par la stratification sociale à laquelle contribuent les patterns d'établissement. De tels groupements humains auront une importance cruciale pour l'avenir politique des Territoires du Nord-Ouest

Oceanic Disposal of Radioactive Wastes: Effects and Proposals

An investigation of the effects of radioactive waste disposal into the oceans pursued by an examination of the hazards involved, the present sources of radioactive wastes and future prospects. The longevity of many radioactive elements, coupled with the awesome consequences to which even a slight miscalculation may lead, are convincing arguments for the most conservative approach to the problem of disposal of radioactive wastes. Present day disposal of radioactive wastes in the oceans, while significant, have not yet had major discernible effects on man or marine life. However, with the worldwide explosion of electrical power demand and the increasing use of nuclear fission as a source of power, the accumulation of non-destructible radioactive wastes on land will tempt industrially crowded nations to turn to the sea as a receptacle for this unwanted material. It is not reasonable to assume that nations can store in perpetuity an ever increasing volume of long lived radioactive waste. Development of controlled nuclear fusion as a source of power, eliminating the generation of radioactive wastes, is urged. No international rules being in effect concerning radioactive pollution of the seas, greater international cooperation in development of controls is recommended

A Comparative Analysis of Work-Life Balance in Intercollegiate Athletic Graduate Assistants and Supervisors

The sport industry is a popular and competitive career field with employees drawn to work in a dynamic, yet often untraditional work environment. The challenge of achieving work-life balance has received considerable study in sport, as employees often find a conflict in balancing their job and other life responsibilities, such as family (work-family conflict) and outside activities. This study introduces a new area of potential conflict (work-extracurricular conflict), the outside activities that may be neglected due to a job, which may impact employees. This area may be especially pertinent to a younger segment of the industry which has not been studied, graduate assistants who work in athletic departments while continuing their education. The purpose of this exploratory study was to assess work-life balance in graduate assistants (GAs) and their supervisors by comparing their levels of work-family conflict, work-extracurricular conflict, job satisfaction, and life satisfaction. Secondly, the study introduced the work-extracurricular conflict construct. Data were collected from GAs and supervisors (N = 47) working in five Division I university athletic departments. Descriptive statistics and ANOVA revealed significant differences between GAs’ and supervisors’ job satisfaction, while determining they did not differ on work-family conflict, work-extracurricular conflict and life satisfaction levels. They reported moderate levels of family and extracurricular conflict. Sport managers can utilize this information to better understand the work-life balance of GAs and establish dialogue on ways to improve GAs experience in hopes of keeping these sport professionals in the industry long-term