Understanding Database Reconstruction Attacks on Public Data

In 2020 the U.S. Census Bureau will conduct the Constitutionally mandated decennial Census of Population and Housing. Because a census involves collecting large amounts of private data under the promise of confidentiality, traditionally statistics are published only at high levels of aggregation. Published statistical tables are vulnerable to DRAs (database reconstruction attacks), in which the underlying microdata is recovered merely by finding a set of microdata that is consistent with the published statistical tabulations. A DRA can be performed by using the tables to create a set of mathematical constraints and then solving the resulting set of simultaneous equations. This article shows how such an attack can be addressed by adding noise to the published tabulations, so that the reconstruction no longer results in the original data

Memória de horta orgânica comunitária em solo urbano

Pesquisa-ação em desenvolvimento junto ao movimento de horta orgânica comunitária Vila Esperança, situado na próspera cidade econômica e tecnologicamente desenvolvida de Campinas (Estado de São Paulo – Brasil), foi idealizada como ação promotora de saúde para ressignificar área pública degradada, utilizada como bota-fora de lixo e resíduos de materiais de construção civil. Em 2007, foi realizada a oficina "Comunidade Saudável" com representantes do poder público, universidade e lideranças comunitárias com perguntas condutoras para responderam “O que é mais importante, possível realizar / proporcionar uma comunidade saudável na região dos Amarais?”. A sugestão foi trabalhar nos eixos saúde, meio ambiente e educação; entre as propostas foi escolhida a implantação de hortas comunitárias. Da proposta inicial de horta comunitária, o movimento passou por várias fases: solicitação de cessão de área pública, fundação de uma Associação para ser a beneficiaria da área, instalação de ponto de água, iniciativas de produção, organização do grupo, orientações para produção de olericultura orgânica. Atualmente o grupo de agricultores e agricultoras da horta recebe orientações para a produção de hortaliças orgânicas. O programa é estruturado em preparo do solo e adubação verde, compostagem, produção de mudas, tratos culturais, pragas e doenças, colheita e comercialização. A pesquisadora acompanha e colabora com o planejamento da implantação da horta comunitária, mantém um caderno de memória das atividades da horta, e através da metodologia de história oral, coleta depoimentos dos agricultores e agricultoras sobre o processo de migração para a região estudada e sobre as transformações territoriais, as questões socioambientais, de saúde e de consolidação da horta comunitária no bairro. Desta experiência formamos um mosaico de histórias que se cruzam e entrecruzam com questões sociais, migração, adensamento populacional, transição entre rural e urbano, mudanças de hábitos e alimentação, qualidade de vida urbana. Entretanto, observamos desafios deste empreendimento: importância do trabalho coletivo, da produção sem uso de agrotóxicos e a sustentabilidade social, econômica e ambiental

A comparison of two magnetic ultra-cold neutron trapping concepts using a Halbach-octupole array

This paper describes a new magnetic trap for ultra-cold neutrons (UCNs) made from a 1.2 m long Halbach-octupole array of permanent magnets with an inner bore radius of 47 mm combined with an assembly of superconducting end coils and bias field solenoid. The use of the trap in a vertical, magneto-gravitational and a horizontal setup are compared in terms of the effective volume and ability to control key systematic effects that need to be addressed in high precision neutron lifetime measurements

Measuring the proton spectrum in neutron decay - latest results with aSPECT

The retardation spectrometer aSPECT was built to measure the shape of the proton spectrum in free neutron decay with high precision. This allows us to determine the antineutrino electron angular correlation coefficient a. We aim for a precision more than one order of magnitude better than the present best value, which is Delta_a /a = 5%. In a recent beam time performed at the Institut Laue-Langevin during April / May 2008 we reached a statistical accuracy of about 2% per 24 hours measurement time. Several systematic effects were investigated experimentally. We expect the total relative uncertainty to be well below 5%.Comment: Accepted for publication in the Conference Proceedings of the International Workshop on Particle Physics with Slow Neutrons 2008 held at the ILL, France. To be published in Nuclear Instruments and Methods in Physics Research, Section

Beta-Adrenergic Receptor Blockade By Propranolol Enhances Retention In A Multitrial Passive-Avoidance Procedure

The effect of beta -adrenergic receptor blockade on retention in a mildly aversive passive-avoidance procedure was investigated. Rats were given passive-avoidance training-1 trial per day for 4 days-and were administered saline, the centrally and peripherally acting beta -adrenergic blocker propranolol (4 or 10 mg/kg ip), or the peripherally acting P-adrenergic blocker sotalol (4 or 10 mg/kg ip) immediately or 2 hr after the Ist trial. Enhanced retention occurred only with the higher dose (10 mg/kg) of propranolol and only when it was administered immediately after training. The enhanced retention produced by propranolol is discussed in terms of opposing, regionally specific actions of beta -adrenergic receptor-mediated neural circuits on modulation of memory

Pemanfaatan Serat Tanaman Tebu sebagai Bahan Baku Tekstil

This research is intended to know 1) the production process of textile from sugarcane fiber, 2) the difference of tensile strength between the textiles from sugar canefiber and those from cotton fiber.This research employed experiment method, involving sugar cane fiber and cottonfiber textile as independent variable. The dependent variables include the tensile strengthand absorpsion of textile. This research was conducted from Februari to Juni 2007 inEngineering Faculty Laboratory of Yogyakarta State University and handicraft andbatik gallery of Yogyakarta

Analisis Kinerja Kualitas Jasa Pelayanan dan Kepuasan Pelanggan pada PT. Pln (Persero) Cabang Manokwari (Studi Kasus Pelanggan Rumah Tangga pada Area Manokwari Kota)

  This study aims to investigate the performance of service quality and customer satisfaction household PT. PLN ( Persero ) Branch Manokwari Manokwari City area , as well as to know what are the things that need to be repaired and maintained in order to improve customer satisfaction PT . PLN ( Persero ) Branch Manokwari . The population used in this study is household’s customers in the city of Manokwari amounts to 21,899 customers. While the sample used in this research were 100 respondents, with a sample calculation using the formula Slovin and sampling techniques using Convenience Sampling. This type of research is descriptive quantitative data analysis. Data analysis tool in this study used SPSS (Statistical Package for the Social Science) to test validity and reliability test of the questionnaires, and the use of Cartesian diagram. The results showed that the average value of customer perceived performance ie PLN 3.40 less than the average value of the customers' expectations of 4.24, meaning that the databases must address satisfying customer satisfaction PLN is still perceived to be at lower levels are still below standard or customer expectations . In addition , as for the things that need to be fixed by the PLN ( located in quadrant A), is dominated by a factor of dimension responsiveness and things that need to be maintained by the PLN (located in quadrant B), namely : a factor of dimensions of empathy ( the payment deadline notification electricity ) and tangible dimensions ( appeals to the public ( customers ) related to the use of electricity ) . While on the other quadrant (quadrant C and D quadrant) is proposed as a form of recommendation of the author to the PT. PLN (Persero)

Enhanced Retention In The Passive-Avoidance Task By 5-HT1A Receptor Blockade Is Not Associated With Increased Activity Of The Central Nucleus Of The Amygdala

The effect of blockade of S-HT1A receptors was investigated on (1) retention in a mildly aversive passive-avoidance task, and (2) spontaneous single-unit activity of central nucleus of the amygdala (CeA) neurons, a brain site implicated in modulation of retention. Systemic administration of the selective S-HT1A antagonist NAN-190 immediately after training markedly-and dose-dependently-facilitated retention in the passive-avoidance task; enhanced retention was time-dependent and was not attributable to variations in wattages of shock received by animals. Systemic administration of NAN-190 had mixed effects on spontaneous single-unit activity of CeA neurons recorded extracellularly in vivo; microiontophoretic application of S-HT, in contrast, consistently and potently suppressed CeA activity. The present findings-that S-HT1A receptor blockade by NAN-190 (1) enhances retention in the passive-avoidance task, and (2) does not consistently increase spontaneous neuronal activity of the CeA-provide evidence that a serotonergic system tonically inhibits modulation of retention in the passive-avoidance task through activation of the S-HT1A receptor subtype at brain sites located outside the CeA

4D STEM: high efficiency phase contrast imaging using a fast pixelated detector

Phase contrast imaging is widely used for imaging beam sensitive and weak phase objects in electron microscopy. In this work we demonstrate the achievement of high efficient phase contrast imaging in STEM using the pnCCD, a fast direct electron pixelated detector, which records the diffraction patterns at every probe position with a speed of 1000 to 4000 frames per second, forming a 4D STEM dataset simultaneously with the incoherent Z-contrast imaging. Ptychographic phase reconstruction has been applied and the obtained complex transmission function reveals the phase of the specimen. The results using GaN and Ti, Nd- doped BiFeO3 show that this imaging mode is especially powerful for imaging light elements in the presence of much heavier elements