149 research outputs found
Helmick + Schechter : Exquisite Corpse
No full textCapasso describes Helmick and Schechter’s public art installation, which consists of 19 equidistant stained-glass panels that represent anatomical cross-sections of the human body based on data from the Visible Human Project® (National Library of Medicine). Installed in the Minnesota Bureau of Criminal Apprehension, the work also incorporates imagery linked to forensic investigation. Includes technical details on the work and a description of the panels
El son calentano como elemento de identidad cultural en la Tierra Caliente del Balsas. Antropología. Boletín Oficial del Instituto Nacional de Antropología e Historia: Música tradicional y procesos de globalización. Num. 80 Nueva Época (2007) septiembre
No full textLieberman, Baruj, Eduardo Llerenas y Enrique Ramírez de Arellano (eds.), Antología del son mexicano/Anthology of mexican sones, México, Corason, 1985.Magis, Carlos H., La lírica popular contemporánea: España, México, Argentina, México, El Colegio de México, 1969.Martínez Ayala, Jorge Amós (ed.), …de tierras abajo vengo: música y danza de la Tierra Caliente del Balsas michoacano, Morelia, Colmich, 2002.Reuter, Jas, La música popular de México: origen e historia de la música que canta y toca el pueblo mexicano, México, Panorama Editorial, 1981.Seeger, Anthony, “Social structure, musicians and behavior”, en Dale A. Olsen y Daniel E. Sheehy, The Garland encyclopedia of world music vol. 2: South America, Mexico, Central America and the Caribbean, New York/London, Garland Publishing, 1998.Serrano Martínez, Celedonio, Coplas populares de Guerrero, México, Libros de México, 1972.Sheehy, Daniel E., “Mexico”, en Dale A. Olsen y Daniel E. Sheehy (eds.), The Garland encyclopedia of world music vol. 2: South America, Mexico, Central America and the Caribbean, New York/London, Garland Publishing, 1998.———“Popular mexican musical traditions: The mariachi of west Mexico and the conjunto jarocho of Veracruz”, en John M. Schechter (ed.), Music in Latin American culture: Regional traditions, New York, Schirmer Books, 1999.Stanford, E. Thomas, “The mexican son”, en Yearbook of the International Folk Music Council 4, 1972.———, El son mexicano: grabaciones de campo de E. Thomas Stanford, México, Urtext, 2001.Warman, Arturo (notas), Sones de México: Antología, México, Conaculta/INI/Pentagrama, 2002.———, Sones y gustos de la Tierra Caliente de Guerrero, Conjunto Ajuchitlán y Conjunto de Baldomiano Flores, México, Conaculta/INI/Pentagrama, 2002
Generalised CP and A4 family symmetry
No full textWe perform a comprehensive study of family symmetry models based on A4 combined with the generalised CP symmetry H CP. We investigate the lepton mixing parameters which can be obtained from the original symmetry A4 ? H CP breaking to different remnant symmetries in the neutrino and charged lepton sectors. We find that only one case is phenomenologically viable, namely G?CP?ZS2×H?CP in the neutrino sector and GlCP?ZT3?HlCP in the charged lepton sector, leading to the prediction of no CP violation, namely ? CP and the Majorana phases ? 21 and ? 31 are all equal to either zero or ?. We then propose an effective supersymmetric model based on the symmetry A4 ? H CP in which trimaximal lepton mixing is predicted together with either zero CP violation or ? CP ? ±?/2 with non-trivial Majorana phases. An ultraviolet completion of the effective model yields a neutrino mass matrix which depends on only three real parameters. As a result of this, all three CP phases and the absolute neutrino mass scale are determined, the atmospheric mixing angle is maximal, and the Dirac CP can either be preserved with ? CP ?=?0, ? or maximally broken with ? CP ?=?±?/2 and sharp predictions for the Majorana phases and neutrinoless double beta deca
Toward Econometric Models of the Security Risk from Remote Attacks
No full textSecurity risk regression models have been successful in estimating the likelihood of attack for simple security threats in which o#ensive and defensive innovations occur at a slow pace, such as burglary. Adapting regression models to the numerous and dynamic threats that face computer systems will be more challenging. One reason is that models of remote network attacks will need to account for the adversaries' ability to use the network to cover their tracks, reducing the risks of incarceration and other harm that could result from staging attacks. When our adversaries no longer face significant risk, the aggregate cost of time, e#ort, and other resources required to stage a successful attack is more likely to be the salient deterrent. The resource cost of attack depends on how strong the system's security is in resisting attack. I present a framework for security risk regression models in which regressors are chosen from four classes, one of which is this security strength. I then present significant refinements to previous metrics of security strength and their measurement
Access for Sale - A New Class of Worm
No full textThe damage inflicted by viruses and worms has been limited because the payloads that are most lucrative to malware authors have also posed the greatest risks to them. The problem facing authors of this self-reproducing malware is that monetizing each intrusion requires the author to risk communication with the infected system or its owner. The tool of choice for malware authors looking to minimize risk and maximize loot has been the carefully target attack, often employing a trojan horses or attack script. However, attacker 's preferences would likely change if they could infect a large number of systems using a worm and sell access to infected systems to other black hats. We introduce a new type of worm that enables this division of labor, installing a back door on each infected system that opens only when presented a system-specific ticket generated by the worm's author. The risk to the worm's author is minimized because he need not communicate with the infected systems. This new class of attack could increase the incentives to write malware and create a market for such specialized skills. In addition to describing this new threat, we propose a number of approaches for defending against it
Majorana neutrino masses from neutrinoless double-beta decays and lepton-number-violating meson decays
No full textAbstractThe Schechter–Valle theorem states that a positive observation of neutrinoless double-beta (0νββ) decays implies a finite Majorana mass term for neutrinos when any unlikely fine-tuning or cancellation is absent. In this note, we reexamine the quantitative impact of the Schechter–Valle theorem, and find that current experimental lower limits on the half-lives of 0νββ-decaying nuclei have placed a restrictive upper bound on the Majorana neutrino mass |δmνee|<7.43×10−29 eV radiatively generated at the four-loop level. Furthermore, we generalize this quantitative analysis of 0νββ decays to that of the lepton-number-violating (LNV) meson decays M−→M′++ℓα−+ℓβ− (for α,β=e or μ). Given the present upper limits on these rare LNV decays, we have derived the loop-induced Majorana neutrino masses |δmνee|<9.7×10−18 eV, |δmνeμ|<1.6×10−15 eV and |δmνμμ|<1.0×10−12 eV from K−→π++e−+e−, K−→π++e−+μ− and K−→π++μ−+μ−, respectively. A partial list of radiative neutrino masses from the LNV decays of D, Ds and B mesons is also given
Balloon Hashing: A Memory-Hard Function Providing Provable Protection Against Sequential Attacks
No full textWe present the Balloon password-hashing algorithm. This is the first practical cryptographic hash function that: (i) has proven memory-hardness properties in the random-oracle model, (ii) uses a password-independent access pattern, and (iii) meets or exceeds the performance of the best heuristically secure password-hashing algorithms. Memory-hard functions require a large amount of working space to evaluate efficiently and when used for password hashing, they dramatically increase the cost of offline dictionary attacks. In this work, we leverage a previously unstudied property of a certain class of graphs (“random sandwich graphs”) to analyze the memory-hardness of the Balloon algorithm. The techniques we develop are general: we also use them to give a proof of security of the scrypt and Argon2i password-hashing functions in the random-oracle model. Our security analysis uses a sequential model of computation, which essentially captures attacks that run on single-core machines. Recent work shows how to use massively parallel special-purpose machines (e.g., with hundreds of cores) to attack Balloon and other memory-hard functions. We discuss these important attacks, which are outside of our adversary model, and propose practical defenses against them. To motivate the need for security proofs in the area of password hashing, we demonstrate and implement a practical attack against Argon2i that successfully evaluates the function with less space than was previously claimed possible. Finally, we use experimental results to compare the performance of the Balloon hashing algorithm to other memory-hard functions
Bootstrapping the Adoption of Internet Security Protocols
No full textThe deployment of network-wide security enhancements to the Internet has proven more di#cult than many had initially anticipated. We leverage existing models of networks' value to model the problem of bootstrapping the adoption of security technologies. We describe a variety of policy interventions and deployment strategies that can help to catalyze this adoption. Using this framework, we provide a series of short case studies for previous attempts to deploy security technologies to the Internet. We then provide a detailed study of strategies for deploying security-enhanced protocols into the Internet's Domain Name System (DNS). Finally, we show how the adoption of these DNS security enhancements can help to alleviate bootstrapping problems that have impeded the deployment of other security-enhanced protocols
Galaxy And Mass Assembly (GAMA) : stellar mass functions by Hubble type
No full textThis work was supported by the Austrian Science Foundation FWF under grant P23946. AWG was supported under the Australian Research Council's funding scheme FT110100263.We present an estimate of the galaxy stellar mass function and its division by morphological type in the local (0.025 < z < 0.06) Universe. Adopting robust morphological classifications as previously presented (Kelvin et al.) for a sample of 3727 galaxies taken from the Galaxy And Mass Assembly survey, we define a local volume and stellar mass limited sub-sample of 2711 galaxies to a lower stellar mass limit of M = 109.0 MΘ. We confirm that the galaxy stellar mass function is well described by a double-Schechter function given by Μ* = 1010.64 MΘ, α1 = 0.43, φ1* = 4.18 dex-1 Mpc-3, α2 = −1.50 and φ2* = 0.74 dex-1 Mpc-3. The constituent morphological-type stellar mass functions are well sampled above our lower stellar mass limit, excepting the faint little blue spheroid population of galaxies. We find approximately 71-4+3 per cent of the stellar mass in the local Universe is found within spheroid-dominated galaxies; ellipticals and S0-Sas. The remaining 29-3+4 per cent falls predominantly within late-type disc-dominated systems, Sab-Scds and Sd-Irrs. Adopting reasonable bulge-to-total ratios implies that approximately half the stellar mass today resides in spheroidal structures, and half in disc structures. Within this local sample, we find approximate stellar mass proportions for E : S0-Sa : Sab-Scd : Sd-Irr of 34 : 37 : 24 :5.Peer reviewe
Hypermedia Interoperability: Navigating the Information Continuum
No full textOpen Hypermedia Systems are designed to allow links to be authored and followed on top of any media format. The link structures are held separately from the documents in a software component called a Link Server. As hypermedia has matured as a research topic attention has turned to standardising the way in which components talk to Link Servers in order to provide interoperability. The Open Hypermedia Systems Working Group took up this challenge and proposed an Open Hypermedia Protocol (OHP). However, the scope of this proposal proved to be too large and the protocol was divided into domain specific parts (Navigational, Spatial and Taxonomic Hypermedia), tackling each domain differently, but consistently. It is questionable whether this step was the correct one, as the domains share many similar features. In this thesis I present a detailed examination of the information spaces that the OHP was attempting to model (from all these considered hypertext domains), which incorporates notions of both behaviour and context. This examination looks at what it means to navigate around the many dimensions of information, across these domains, and reveals a cohesive and continuous structure that I call the Information Continuum. The Fundamental Open Hypermedia Model (FOHM) is presented, which is capable of representing the structures of this continuum in a consistent and meaningful way. FOHM is coupled with an agent infrastructure to produce an implementation that demonstrates the model being used for cross-domain interoperability
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