2,987 research outputs found
SUSY Moose Runs and Hops: An extra dimension from a broken deformed CFT
We find a class of four dimensional deformed conformal field theories which
appear extra dimensional when their gauge symmetries are spontaneously broken.
The theories are supersymmetric moose models which flow to interacting
conformal fixed points at low energies, deformed by superpotentials. Using
a-maximization we give strong nonperturbative evidence that the hopping terms
in the resulting latticized action are relevant deformations of the fixed point
theories. These theories have an intricate structure of RG flows between
conformal fixed points. Our results suggest that at the stable fixed points
each of the bulk gauge couplings and superpotential hopping terms is turned on,
in favor of the extra dimensional interpretation of the theory. However, we
argue that the higher dimensional gauge coupling is generically small compared
to the size of the extra dimension. In the presence of a brane the topology of
the extra dimension is determined dynamically and depends on the numbers of
colors and bulk and brane flavors, which suggests phenomenological
applications. The RG flows between fixed points in these theories provide a
class of tests of Cardy's conjectured a-theorem.Comment: 34 pages, 12 EPS figures, one reference adde
Wisent: Robust Downstream Communication and Storage for Computational RFIDs
Computational RFID (CRFID) devices are emerging platforms that can enable
perennial computation and sensing by eliminating the need for batteries.
Although much research has been devoted to improving upstream (CRFID to RFID
reader) communication rates, the opposite direction has so far been neglected,
presumably due to the difficulty of guaranteeing fast and error-free transfer
amidst frequent power interruptions of CRFID. With growing interest in the
market where CRFIDs are forever-embedded in many structures, it is necessary
for this void to be filled. Therefore, we propose Wisent-a robust downstream
communication protocol for CRFIDs that operates on top of the legacy UHF RFID
communication protocol: EPC C1G2. The novelty of Wisent is its ability to
adaptively change the frame length sent by the reader, based on the length
throttling mechanism, to minimize the transfer times at varying channel
conditions. We present an implementation of Wisent for the WISP 5 and an
off-the-shelf RFID reader. Our experiments show that Wisent allows transfer up
to 16 times faster than a baseline, non-adaptive shortest frame case, i.e.
single word length, at sub-meter distance. As a case study, we show how Wisent
enables wireless CRFID reprogramming, demonstrating the world's first
wirelessly reprogrammable (software defined) CRFID.Comment: Accepted for Publication to IEEE INFOCOM 201
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Anaplastic Thyroid Carcinoma Histologically Mimicking a Plasmacytoma.
Anaplastic (undifferentiated) thyroid carcinoma (ATC) is a rare malignancy which may arise from transformation of a pre-existing differentiated carcinoma. We report the unique case where a lesion of thyroid origin presented with the histological features of mature plasma cells. Immunohistochemistry confirmed the lesion to be an anaplastic thyroid carcinoma arising from papillary thyroid carcinoma. A tumor mimicking a malignancy of a different cellular origin can lead clinicians to incorrect treatment approaches. Careful correlation with clinical details and knowledge of these unique presentations is important for reaching the correct diagnosis
Influence Scores at Scale for Efficient Language Data Sampling
Modern ML systems ingest data aggregated from diverse sources, such as
synthetic, human-annotated, and live customer traffic. Understanding
\textit{which} examples are important to the performance of a learning
algorithm is crucial for efficient model training. Recently, a growing body of
literature has given rise to various "influence scores," which use training
artifacts such as model confidence or checkpointed gradients to identify
important subsets of data. However, these methods have primarily been developed
in computer vision settings, and it remains unclear how well they generalize to
language-based tasks using pretrained models.
In this paper, we explore the applicability of influence scores in language
classification tasks. We evaluate a diverse subset of these scores on the SNLI
dataset by quantifying accuracy changes in response to pruning training data
through random and influence-score-based sampling. We then stress-test one of
the scores -- "variance of gradients" (VoG) from Agarwal et al. (2022) -- in an
NLU model stack that was exposed to dynamic user speech patterns in a voice
assistant type of setting. Our experiments demonstrate that in many cases,
encoder-based language models can be finetuned on roughly 50% of the original
data without degradation in performance metrics. Along the way, we summarize
lessons learned from applying out-of-the-box implementations of influence
scores, quantify the effects of noisy and class-imbalanced data, and offer
recommendations on score-based sampling for better accuracy and training
efficiency.Comment: Accepted at EMNLP '2
A case study : using choice experiment in an open distance learning
There are approximately 62 private higher education providers in Malaysia as on May 2014. Among them, there are
several institutions offer the open and distance (ODL) mode of teaching and learning pedagogy. Due to the ODL flexibility
mode, there has been quite a stir of competition in the education industry. Learners of ODL tend to be more challenging to
fulfill their needs as they have other commitments in life, hence the ODL mode to be chosen. Therefore, the ODL education
institution need to able to read and provide the necessary needs to these learners. The aim of this study is to investigate the
attributes that contributes to choosing an ODL private higher education institution in Malaysia and to explore the
consumer behavior in the area of student choice, and consumers’ willingness-to-pay price. Although there are studies on
the attributes that influence student choice of a university, but has failed to use the choice experiment theory to examine the
attributes that influence choice of course particularly an ODL mode. The sample population was 320 using face-to-face
interview. The results would be able to introduce the right marketing strategy for the institution in Malaysia. (Abstract by author
An Unusual Case Presentation of the May-Thurner Syndrome
Summary: A 56-year-old woman underwent abdominoplasty with no immediate complications. She had no known bleeding history nor any relevant past surgical history. Adequate preventive measures for venous thromboembolism were performed, including sequential compression devices, good hydration, and early ambulation. At 17 days post operation, the patient presented to the emergency room complaining of left leg swelling and sharp, shooting pain radiating down her left leg. Workup in the Emergency Room revealed significant venous thrombosis involving complete occlusion of the major veins of the left leg. There were no indications of cardiopulmonary compromise. Angiography revealed an anatomical variant consistent with May-Thurner Syndrome (MTS). This variant first described in 1957 may present in up to one-quarter of patients, more commonly in young women. This case appears to the first reported of MTS occurring in association with a postoperative complication of abdominoplasty. Diagnosis and management considerations are discussed
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