Testing of Interposer-Based 2.5D Integrated Circuits

The unprecedented and relentless growth in the electronics industry is feeding the demand for integrated circuits (ICs) with increasing functionality and performance at minimum cost and power consumption. As predicted by Moore's law, ICs are being aggressively scaled to meet this demand. While the continuous scaling of process technology is reducing gate delays, the performance of ICs is being increasingly dominated by interconnect delays. In an effort to improve submicrometer interconnect performance, to increase packing density, and to reduce chip area and power consumption, the semiconductor industry is focusing on three-dimensional (3D) integration. However, volume production and commercial exploitation of 3D integration are not feasible yet due to significant technical hurdles.

At the present time, interposer-based 2.5D integration is emerging as a precursor to stacked 3D integration. All the dies and the interposer in a 2.5D IC must be adequately tested for product qualification. However, since the structure of 2.5D ICs is different from the traditional 2D ICs, new challenges have emerged: (1) pre-bond interposer testing, (2) lack of test access, (3) limited ability for at-speed testing, (4) high density I/O ports and interconnects, (5) reduced number of test pins, and (6) high power consumption. This research targets the above challenges and effective solutions have been developed to test both dies and the interposer.

The dissertation first introduces the basic concepts of 3D ICs and 2.5D ICs. Prior work on testing of 2.5D ICs is studied. An efficient method is presented to locate defects in a passive interposer before stacking. The proposed test architecture uses e-fuses that can be programmed to connect or disconnect functional paths inside the interposer. The concept of a die footprint is utilized for interconnect testing, and the overall assembly and test flow is described. Moreover, the concept of weighted critical area is defined and utilized to reduce test time. In order to fully determine the location of each e-fuse and the order of functional interconnects in a test path, we also present a test-path design algorithm. The proposed algorithm can generate all test paths for interconnect testing.

In order to test for opens, shorts, and interconnect delay defects in the interposer, a test architecture is proposed that is fully compatible with the IEEE 1149.1 standard and relies on an enhancement of the standard test access port (TAP) controller. To reduce test cost, a test-path design and scheduling technique is also presented that minimizes a composite cost function based on test time and the design-for-test (DfT) overhead in terms of additional through silicon vias (TSVs) and micro-bumps needed for test access. The locations of the dies on the interposer are taken into consideration in order to determine the order of dies in a test path.

To address the scenario of high density of I/O ports and interconnects, an efficient built-in self-test (BIST) technique is presented that targets the dies and the interposer interconnects. The proposed BIST architecture can be enabled by the standard TAP controller in the IEEE 1149.1 standard. The area overhead introduced by this BIST architecture is negligible; it includes two simple BIST controllers, a linear-feedback-shift-register (LFSR), a multiple-input-signature-register (MISR), and some extensions to the boundary-scan cells in the dies on the interposer. With these extensions, all boundary-scan cells can be used for self-configuration and self-diagnosis during interconnect testing. To reduce the overall test cost, a test scheduling and optimization technique under power constraints is described.

In order to accomplish testing with a small number test pins, the dissertation presents two efficient ExTest scheduling strategies that implements interconnect testing between tiles inside an system on chip (SoC) die on the interposer while satisfying the practical constraint that the number of required test pins cannot exceed the number of available pins at the chip level. The tiles in the SoC are divided into groups based on the manner in which they are interconnected. In order to minimize the test time, two optimization solutions are introduced. The first solution minimizes the number of input test pins, and the second solution minimizes the number output test pins. In addition, two subgroup configuration methods are further proposed to generate subgroups inside each test group.

Finally, the dissertation presents a programmable method for shift-clock stagger assignment to reduce power supply noise during SoC die testing in 2.5D ICs. An SoC die in the 2.5D IC is typically composed of several blocks and two neighboring blocks that share the same power rails should not be toggled at the same time during shift. Therefore, the proposed programmable method does not assign the same stagger value to neighboring blocks. The positions of all blocks are first analyzed and the shared boundary length between blocks is then calculated. Based on the position relationships between the blocks, a mathematical model is presented to derive optimal result for small-to-medium sized problems. For larger designs, a heuristic algorithm is proposed and evaluated.

In summary, the dissertation targets important design and optimization problems related to testing of interposer-based 2.5D ICs. The proposed research has led to theoretical insights, experiment results, and a set of test and design-for-test methods to make testing effective and feasible from a cost perspective.

The role of inflammatory mediators in the overactive and bladder pain syndromes

The Overactive Bladder (OAB) and Bladder Pain Syndrome (BPS) are debilitating disorders for which the pathophysiological mechanisms are poorly understood. Injury or dysfunction of the protective urothelial barrier layer, specifically the proteoglycan composition and number, has been proposed as the primary pathological characteristic of BPS. For OAB, the myogenic theory with dysfunction of the muscarinic receptors is the most reiterated hypothesis. For both over activity of the inflammatory response has been posited to play a major role in these diseases. We hypothesise that BPS and OAB are peripheral sensory disorders, with an increase in inflammatory mediators, such as cytokines and chemokines, which are capable of activating, either directly or indirectly, sensory nerve activity causing the disease. The aim of the PhD is to identify potential new therapeutic targets for the treatment of BPS and OAB. We used medium throughput quantitative gene expression analysis of 96 inflammation associated mediators to measure gene expression levels in BPS and OAB bladder biopsies and compared them to control samples. Then we created a novel animal model of disease by specific proteoglycan deglycosylation of the bladder mucosal barrier, using the bacterial enzymes Chondroitinase ABC and Heparanase III. These enzymes specifically remove the glycosaminoglycan side chains from the urothelial proteoglycan molecules. We tested role of the identified mediators in this animal model. In addition, in order to determine on which patients peripheral treatment strategies may work, we assessed the effect of local anaesthetics on patients with bladder pain. Gene expression analysis did not reveal a difference in inflammatory genes in the OAB versus control biopsies. However, several genes were upregulated in BPS versus control samples, from which two genes, FGF7 and CLL21 were correlated with patient clinical phenotypes for ICS/PI symptom and problem indices respectively. In order to determine which patients are likely to respond to treatment, we sought to characterise the bladder pain in BPS patients. Using urodynamics and local anaesthetics, we differentiated patients with peripherally mediated pain and patients with central sensitisation of their pain. Finally to determine the role of these mediators in bladder pain, we created an animal model of disease, which specifically replicates the human pathology: namely disruption in the barrier proteoglycan molecules. CCL21 led to an increase in painrelated behaviour, while FGF7 attenuated this behaviour, as measured by cystometry, spinal c-fos expression and mechanical withdrawal threshold examination. In conclusion, we have identified CCL21 and FGF7 as potential targets for the treatment of BPS. Manipulation of these ligands or their receptors may prove to be valuable previously unexploited targets for the treatment of BPS.

Para un catálogo atractivo : Libros y políticas editoriales para las bibliotecas populares. La propuesta de Domingo Faustino Sarmiento

Se expone una hipótesis de trabajo para abordar el estudio de los escritos de Domingo Faustino Sarmiento sobre las bibliotecas populares. En ese contexto, el presente ensayo explora una cuestión específica: ¿qué libros para las bibliotecas populares? A través de un análisis crítico de los textos del autor, se intenta mostrar que los lineamientos que perfilan las características de las colecciones de estas instituciones deben identificarse en los vínculos que mantienen los múltiples núcleos temáticos analizados por Sarmiento, a saber: el examen del comercio y la industria del libro en América, la organización de proyectos editoriales, la toma de posición frente a la lectura de novelas, entre otros. A partir de un artículo concreto, se describe la manera en que Sarmiento entiende la relación entre los lectores y las lecturas en el contexto específico de una biblioteca popular. En un balance final, se realizan dos observaciones. Primero: la elección de lecturas no es una prescripción aislada, sino un complejo de observaciones sobre la presencia del libro y la lectura en América Latina, especialmente en Chile y en la Argentina. Segundo, el autor apela a la constitución de un catálogo capaz de atraer a los lectores. Esta finalidad, es prioritaria en su proyecto

Documentos audiovisuales y prácticas laborales en las bibliotecas populares de La Plata : Un estudio de caso

Se describe y analiza el tratamiento que los documentos audiovisuales reciben, a través de las políticas de desarrollo de colecciones, los procesos técnicos y los servicios, en una muestra de bibliotecas populares de la ciudad de La Plata. Se señala la existencia de un panorama común a la mayor parte de las bibliotecas. Se destacan las características de dos instituciones que se constituyen como excepciones a esta generalidad

Para un catálogo atractivo : Libros y políticas editoriales para las bibliotecas populares. La propuesta de Domingo Faustino Sarmiento

Se expone una hipótesis de trabajo para abordar el estudio de los escritos de Domingo Faustino Sarmiento sobre las bibliotecas populares. En ese contexto, el presente ensayo explora una cuestión específica: ¿qué libros para las bibliotecas populares? A través de un análisis crítico de los textos del autor, se intenta mostrar que los lineamientos que perfilan las características de las colecciones de estas instituciones deben identificarse en los vínculos que mantienen los múltiples núcleos temáticos analizados por Sarmiento, a saber: el examen del comercio y la industria del libro en América, la organización de proyectos editoriales, la toma de posición frente a la lectura de novelas, entre otros. A partir de un artículo concreto, se describe la manera en que Sarmiento entiende la relación entre los lectores y las lecturas en el contexto específico de una biblioteca popular. En un balance final, se realizan dos observaciones. Primero: la elección de lecturas no es una prescripción aislada, sino un complejo de observaciones sobre la presencia del libro y la lectura en América Latina, especialmente en Chile y en la Argentina. Segundo, el autor apela a la constitución de un catálogo capaz de atraer a los lectores. Esta finalidad, es prioritaria en su proyecto

Documentos audiovisuales y prácticas laborales en las bibliotecas populares de La Plata : Un estudio de caso

Se describe y analiza el tratamiento que los documentos audiovisuales reciben, a través de las políticas de desarrollo de colecciones, los procesos técnicos y los servicios, en una muestra de bibliotecas populares de la ciudad de La Plata. Se señala la existencia de un panorama común a la mayor parte de las bibliotecas. Se destacan las características de dos instituciones que se constituyen como excepciones a esta generalidad

Particle characterization at CVAO during the 2007 RHaMBLe intensive

The chemical characterization of filter high volume (HV) and Berner impactor (BI) samples PM during RHaMBLe (Reactive Halogens in the Marine Boundary Layer) 2007 shows that the Cape Verde aerosol particles are mainly composed of sea salt, mineral dust and associated water. Minor components are nss-salts, OC and EC. The influence from the African continent on the aerosol constitution was generally small but air masses which came from south-western Europe crossing the Canary Islands transported dust to the sampling site together with other loadings. The mean mass concentration was determined for PM10 to 17 µg/m**3 from impactor samples and to 24.2 µg/m**3 from HV filter samples. Non sea salt (nss) components of PM were found in the submicron fractions and nitrate in the coarse mode fraction. Bromide was found in all samples with much depleted concentrations in the range 1-8 ng/m**3 compared to fresh sea salt aerosol indicating intense atmospheric halogen chemistry. Loss of bromide by ozone reaction during long sampling time is supposed and resulted totally in 82±12% in coarse mode impactor samples and in filter samples in 88±6% bromide deficits. A chloride deficit was determined to 8% and 1% for the coarse mode particles (3.5-10 µm; 1.2-3.5 µm) and to 21% for filter samples. During 14 May with high mineral dust loads also the maximum of OC (1.71 µg/m**3) and EC (1.25 µg/m**3) was measured. The minimum of TC (0.25 µg/m**3) was detected during the period 25 to 27 May when pure marine air masses arrived. The concentrations of carbonaceous material decrease with increasing particle size from 60% for the ultra fine particles to 2.5% in coarse mode PM. Total iron (dust vs. non-dust: 0.53 vs. 0.06 µg/m**3), calcium (0.22 vs. 0.03 µg/m**3) and potassium (0.33 vs. 0.02 µg/m**3) were found as good indicators for dust periods because of their heavily increased concentration in the 1.2 to 3.5 µm fraction as compared to their concentration during the non-dust periods. For the organic constituents, oxalate (78-151 ng/m**3) and methanesulfonic acid (MSA, 25-100 ng/m**3) are the major compounds identified. A good correlation between nss-sulphate and MSA was found for the majority of days indicating active DMS chemistry and low anthropogenic influences.

Long-term chemical characterization of aerosols at CVAO from 2007 to 2011

The first long-term aerosol sampling and chemical characterization results from measurements at the Cape Verde Atmospheric Observatory (CVAO) on the island of São Vicente are presented and are discussed with respect to air mass origin and seasonal trends. In total 671 samples were collected using a high-volume PM10 sampler on quartz fiber filters from January 2007 to December 2011. The samples were analyzed for their aerosol chemical composition, including their ionic and organic constituents. Back trajectory analyses showed that the aerosol at CVAO was strongly influenced by emissions from Europe and Africa, with the latter often responsible for high mineral dust loading. Sea salt and mineral dust dominated the aerosol mass and made up in total about 80% of the aerosol mass. The 5-year PM10 mean was 47.1 ± 55.5 µg/m**2, while the mineral dust and sea salt means were 27.9 ± 48.7 and 11.1 ± 5.5 µg/m**2, respectively. Non-sea-salt (nss) sulfate made up 62% of the total sulfate and originated from both long-range transport from Africa or Europe and marine sources. Strong seasonal variation was observed for the aerosol components. While nitrate showed no clear seasonal variation with an annual mean of 1.1 ± 0.6 µg/m**3, the aerosol mass, OC (organic carbon) and EC (elemental carbon), showed strong winter maxima due to strong influence of African air mass inflow. Additionally during summer, elevated concentrations of OM were observed originating from marine emissions. A summer maximum was observed for non-sea-salt sulfate and was connected to periods when air mass inflow was predominantly of marine origin, indicating that marine biogenic emissions were a significant source. Ammonium showed a distinct maximum in spring and coincided with ocean surface water chlorophyll a concentrations. Good correlations were also observed between nss-sulfate and oxalate during the summer and winter seasons, indicating a likely photochemical in-cloud processing of the marine and anthropogenic precursors of these species. High temporal variability was observed in both chloride and bromide depletion, differing significantly within the seasons, air mass history and Saharan dust concentration. Chloride (bromide) depletion varied from 8.8 ± 8.5% (62 ± 42%) in Saharan-dust-dominated air mass to 30 ± 12% (87 ± 11%) in polluted Europe air masses. During summer, bromide depletion often reached 100% in marine as well as in polluted continental samples. In addition to the influence of the aerosol acidic components, photochemistry was one of the main drivers of halogenide depletion during the summer; while during dust events, displacement reaction with nitric acid was found to be the dominant mechanism. Positive matrix factorization (PMF) analysis identified three major aerosol sources: sea salt, aged sea salt and long-range transport. The ionic budget was dominated by the first two of these factors, while the long-range transport factor could only account for about 14% of the total observed ionic mass.

News agencies, their constant reinvention as a strategy to face competition

News agencies compete for a foothold as providers of information and mass media. Covered by a technological class infrastructure, Associated Press, Reuters, Agence FrancePresse (AFP) and EFE are leaders of the global media system because they introduce revolutionary changes in their production routines, professional culture, journalistic genres and styles; also for its innovative product offerings and services. This article also focuses on the strategies of the agencies to get closer to their audiences, from the agreements established and the treatment of very specific themes. Some solutions that contribute to the future survival of these entities are also proposed.

Aportación científica de los congresos de la AE-IC (2008-2014): reseña histórica y estado actual de la investigación en Comunicación

Esta investigación analiza la producción científica presentada en los congresos de la Asociación Española de Investigación de la Comunicación con el fin de comprender su desarrollo y su estado actual. Para ello, se han analizado 715 comunicaciones con veintidós variables, entre las que se encuentran: el autor, el género, la vinculación institucional, la nacionalidad, el tipo de comunicación, la metodología empleada, la réplica de contenidos, la tipología descriptiva y la finalidad de las comunicaciones. Entre otros hallazgos, los resultados muestran una mayoría femenina en la contribución académica, pero no entre los cargos académicos de mayor rango; la preferencia de los objetos de estudio empresariales, pero no profesionales o laborales; una tendencia hacia la mayor participación de doctorandos; y una elevada concentración de la producción científica en cuanto a la temática y la distribución territorial.

Humanism is a violence typical of the beasts. Philosozing with a Hammer, using Levinas and Derrida, the Measure of the Human and the Human as a measure

Levinas’s reflections arose as a critique of traditional philosophy which, since it was based on presence and identity, leads to the exclusion of the other. Instead of an onto-logical thought the Lithuanian proposes that the ipseity of the human being be constituted by alterity, and that it be so ethically, because the subject is sub-ject, that is, that which upholds, responsibility. In an attempt to take the obligatory attention to the otherness of the other even further, Derrida would develop a radical critique of the Levinasian posture. Deconstruction of every trace of ipseity and sovereignty in the relationship with the other, the reading that we have done of the work of Derrida opts for a no definable understanding of the human. That is why every de-limitation of an ethical field as a properly human implies a brutal violence that the levinasian humanism of the other tried to exceed.

Olhar o Outro: Narrativas museológicas sobre a diversidade na época da globalização

O artigo apresenta os resultados parciais duma investigação em curso sobra narrativas museológicas sobre o reconhecimento da diversidade cultural. A partir duma análise sobre os processos de construção a ideia do outro em diferentes exposições em diverso museus, na Península Ibérica, no Brasil e em Moçambique, procuramos identificar os processos narrativos hegemónicos e os processos de silenciamento e esquecimento da diferença. Argumentamos, a partir do discurso identitário português, que sem a inclusão das narrativas sobre a diversidade, a cultura hegemónica não está a fornecer uma cartografia mental adequada para orientar e enfrentar a construção de inovação social nos museus.

Adesp. fr. 700 K.-Sn. y "Andrómeda" de Eurípides

adesp. fr. 700 Kn.-Sn. podría proceder de Andrómeda de Eurípides y no de una Níobe. Los siguientes elementos de los frs. (a) y (b) pueden responder a lo que se conoce de la tragedia de Eurípides: (a) la semejanza con una estatua; (b) la novia de Hades; (c) el silencio del personaje; (d) la colaboración con las Moiras; (e) el contraste entre la fortuna regia y la desgracia y el sufrimiento de los padres. No es, por tanto, necesario modificar el texto recibido para eliminar μάγους πάγας y la referencia a las trampas mágicas en el v. 5, que cuadra bien con Medusa y Perseo.

Eclipses, razón y superstición en las vidas de Nicias y Dión de Plutarco

A partir de un abordaje retórico-literario, nuestro objetivo es indagar las representaciones discursivas de los elementos supersticiosos en la biografía de Nicias y en la de Dión. Tomaremos como ejemplo el eclipse de luna narrado en Nicias 23 y reiterado en Dión 24, para demostrar que mediante la repetición del ejemplo en dos contextos distintos Plutarco nos invita a reflexionar sobre la superstición de un modo más atractivo que la mera exposición teórica de doctrinas filosóficas.

Threat Analysis of BlackEnergy Malware for Synchrophasor based Real-time Control and Monitoring in Smart Grid

The BlackEnergy malware targeting critical infrastructures has a long history. It evolved over time from a simple DDoS platform to a quite sophisticated plug-in based malware. The plug-in architecture has a persistent malware core with easily installable attack specific modules for DDoS, spamming, info-stealing, remote access, boot-sector formatting etc. BlackEnergy has been involved in several high profile cyber physical attacks including the recent Ukraine power grid attack in December 2015. This paper investigates the evolution of BlackEnergy and its cyber attack capabilities. It presents a basic cyber attack model used by BlackEnergy for targeting industrial control systems. In particular, the paper analyzes cyber threats of BlackEnergy for synchrophasor based systems which are used for real-time control and monitoring functionalities in smart grid. Several BlackEnergy based attack scenarios have been investigated by exploiting the vulnerabilities in two widely used synchrophasor communication standards: (i) IEEE C37.118 and (ii) IEC 61850-90-5. Specifically, the paper addresses reconnaissance, DDoS, man-in-the-middle and replay/reflection attacks on IEEE C37.118 and IEC 61850-90-5. Further, the paper also investigates protection strategies for detection and prevention of BlackEnergy based cyber physical attacks.