Simple and Deterministic Matrix Sketching

We adapt a well known streaming algorithm for approximating item frequencies to the matrix sketching setting. The algorithm receives the rows of a large matrix $A \in \R^{n \times m}$ one after the other in a streaming fashion. It maintains a sketch matrix B \in \R^ {1/\eps \times m} such that for any unit vector $x$ [\|Ax\|^2 \ge \|Bx\|^2 \ge \|Ax\|^2 - \eps \|A\|_{f}^2 \.] Sketch updates per row in $A$ require O(m/\eps^2) operations in the worst case. A slight modification of the algorithm allows for an amortized update time of O(m/\eps) operations per row. The presented algorithm stands out in that it is: deterministic, simple to implement, and elementary to prove. It also experimentally produces more accurate sketches than widely used approaches while still being computationally competitive

How Common are Engines in Ib/c Supernovae?

The association of γ-ray bursts (GRBs) and core-collapse supernovae (SNe) of Type Ib and Ic was motivated by the detection of SN 1998bw in the error box of GRB980425 and the now-secure identification of a SN 1998bw-like event in the cosmological GRB030329. The bright radio emission from SN 1998bw indicated that it possessed some of the unique attributes expected of GRBs, namely a large reservoir of energy in (mildly) relativistic ejecta and variable energy input. Here we discuss the results of a systematic program of radio observations of most reported Type Ib/c SNe accessible to the Very Large Array, designed to determine the fraction of Type Ib/c SNe driven by an engine. We conclude that: (i) the incidence of such events is low, < 3%, and (ii) there appears to be a clear dichotomy between the majority of hydrodynamic explosions (SNe) and engine-driven explosions (GRBs)

Quality of life, burden and emotion regulation difficulties in relatives of borderline personality disorder patients.

Treball Final de Grau en Psicologia. Codi: PS1048. Curs: 2018/2019Borderline Personality Disorder (BPD) is a mental disorder characterized by dominant patterns of emotional instability, in addition to presenting alterations of self-image, instability in interpersonal relationships, marked impulsiveness and suicidal behaviors (suicidal ideation and attempts) causing a great interference in the life of the individual. There are several factors involved in BPD, including the family. Thus, relatives play an important role in the onset and development of the disorder, while at the same time the diagnosis of BPD and the associated symptoms influence the status of relatives. Some studies show high levels of burden, difficulties in emotion regulation and a deterioration in the well-being of the relatives of patients with BPD. The objective of this work was to study the level of burden and difficulties in emotional regulation in a sample of 49 relatives of patients with BPD, as well as to determine their levels of quality of life. In addition, the possible relation among these variables was also studied. The Quality of Life Index (QLI), the Difficulties in Emotion Regulation Scale (DERS) and the Burden Assessment Scale (BAS) were used to carry out the study. Regarding the results, relatives showed burden scores above the average, moderate difficulties in emotion regulation and also a moderate level of quality of life. Moreover, a significant and negative correlation was obtained between burden and quality of life, and a significant and positive correlation was shown between the difficulties in emotion regulation and burden. These data provide evidence about the importance of taking into account families in the BPD intervention processes to improve the well-being of both patients and relatives.El Trastorno Límite de la Personalidad (TLP) es un trastorno mental caracterizado por patrones dominantes de inestabilidad emocional, además de presentar alteraciones de la auto-imagen, inestabilidad en las relaciones interpersonales, una marcada impulsividad y conductas suicidas (ideación e intentos suicidas) causando una gran interferencia en la vida del individuo. En el TLP intervienen varios factores, entre los cuales se encuentra la familia. Así, la familia juega un papel importante en la aparición y el desarrollo del trastorno, mientras que al mismo tiempo el diagnóstico de TLP y los síntomas asociados influyen en el estado de los familiares. Algunos estudios muestran niveles altos de carga, dificultades en la regulación emocional y un deterioro en el bienestar de los familiares de pacientes con TLP. El objetivo de este trabajo consistió en estudiar cuál era el nivel de carga y de dificultades en la regulación emocional en una muestra de 49 familiares de pacientes con TLP, así como determinar sus niveles de calidad de vida. Además, se estudió la posible relación entre estas variables. Para llevar a cabo el estudio se utilizaron las escalas de Quality of Life Index (QLI), Difficulties in Emotion Regulation Scale (DERS) y Burden Assessment Scale (BAS). Respecto a los resultados, se obtuvieron puntuaciones de carga por encima de la media, dificultades en regulación emocional moderadas y un nivel de calidad de vida también moderado. Por otra parte, se obtuvo una relación significativa y negativa entre la carga y la calidad de vida, y una relación significativa y positiva entre las dificultades en la regulación emocional y la carga. Estos datos aportan evidencias acerca de la importancia de tener en cuenta a las familias en los procesos de intervención del TLP para mejorar tanto el bienestar de los pacientes como el de sus familiares

Lesbians and Transgenders in Japanese Media

Japanese GLBT appear to have always held a place in national media. From the the Edo period to the modern age, the Japanese people have constantly been exposed to different types of GLBT society, whether or not they realized it at the time. In this paper, I explore the representations of lesbians and transgenders during the Edo period (1600 to 1860) and in the modern and post-modern era (1868 to the present). I look at ukiyo-e from the Edo period and then Western-style theatre and newspaper stories from the modern era to grasp how lesbians have been portrayed through the years. Then I look at onnagata of Kabuki and modern-day new half in order to show how the concept of a transgender has changed over time in the media. Just how has the Japanese perspective changed after the mass introduction of Western culture and ideals during the Meiji period