Detection of Review Abuse via Semi-Supervised Binary Multi-Target Tensor Decomposition

Product reviews and ratings on e-commerce websites provide customers with detailed insights about various aspects of the product such as quality, usefulness, etc. Since they influence customers' buying decisions, product reviews have become a fertile ground for abuse by sellers (colluding with reviewers) to promote their own products or to tarnish the reputation of competitor's products. In this paper, our focus is on detecting such abusive entities (both sellers and reviewers) by applying tensor decomposition on the product reviews data. While tensor decomposition is mostly unsupervised, we formulate our problem as a semi-supervised binary multi-target tensor decomposition, to take advantage of currently known abusive entities. We empirically show that our multi-target semi-supervised model achieves higher precision and recall in detecting abusive entities as compared to unsupervised techniques. Finally, we show that our proposed stochastic partial natural gradient inference for our model empirically achieves faster convergence than stochastic gradient and Online-EM with sufficient statistics.Comment: Accepted to the 25th ACM SIGKDD Conference on Knowledge Discovery and Data Mining, 2019. Contains supplementary material. arXiv admin note: text overlap with arXiv:1804.0383

Sperm recovery and IVF outcome after surgical sperm retrieval in azoospermia: our experience

Background: In the last decade, male factor infertility has been recognized as a significant global problem, which is on an increase. Till date, very few options are available for ameliorating male factor infertility. Development of intracytoplasmic sperm injection has revolutionized the treatment of males with very low sperm counts or with poor quality sperm. However, patients with a diagnosis of azoospermia had no option but to resort to adoption or use of donor sperm. The clinical management of men with azoospermia seeking fertility has been a challenge for andrologists, urologists, and reproductive medicine specialists alike. The older approaches denied such couple the possibility of having own genetic children. Surgical sperm retrieval and intracytoplasmic sperm injection have successfully transformed the treatment of male infertility so that now most of the men can father their own children. The aim of this study is to present the outcome of IVF with surgically retrieved sperm from azoospermic men.Methods: This study was a retrospective analysis of 100 cycles using surgically retrieved sperm. Outcome measures were fertilization rate (FR) and implantation rate (IR) per transfer.Results: Sperm retrieval rate in our study was 76% when Per cutaneous epididymal sperm aspiration (PESA) and Testicular sperm extraction (TESE) are combined. Our data demonstrated similar outcome between the use of epididymal or testicular sperm in men with azoospermic. There was no statistical difference concerning fertilization rate, embryo quality and pregnancy rate between ICSI with surgically retrieved sperm and ejaculated sperms.Conclusions: Surgical sperm retrieval is a feasible and successful procedure. Spermatozoa can be retrieved from the testis in up to 76% of patients, even in cases with severe disorders of spermatogenesis and deranged hormonal profile. Comprehensive genetic counseling is important for infertile couples deciding for surgical sperm retrieval, since genetic disorders, as yet undetected, may be passed on to the following generation with multiplying variety.

Necessity of Particle size studies of Ores from Bihar by the Mineral Industry

The measurment of particle size of various minerals, specially of the friable ores, which are commonly found in Bihar and the study of properties of material as function of size have applications in several fields. Recently, the subject has attracted the attention of industrial researchers. In this paper the necessity of particle size studies of ores of Bihar as applicable in general to the mining and mineral industries is discussed

Possibility of Coherent Phenomena like Bloch Oscillations with Single Photons via W-States

We examine the behavior of single photons at multiport devices and inquire if coherent effects are possible. In particular we study how single photons need to be manipulated in order to study coherent phenomena. We show that single photons need to be produced in W states which lead to vanishing mean amplitude but nonzero correlations between the inputs at different ports. Such correlations restore coherent effects with single photons. As a specific example we demonstrate Bloch oscillations with single photons and thus provide strict analog of Bloch oscillation of electrons.Comment: 5 pages, 7 figure

Role of modified biophysical profile in the management of post term pregnancy

Background: Prolonged gestation complicates 5% to 10% of all pregnancies and confers increased risk to both the fetus and mother. In the west about 18% of all singleton pregnancies persist beyond 41 weeks, 10% (range, 3% to 14%) continue beyond 42 weeks and 4% (range, 2% to 7%) continue beyond 43 completed weeks in the absence of an obstetric intervention. The risks for prolonged and post-term pregnancy include obesity, nulliparity, maternal age >30 years. Apart from these racial and ethnic differences have also been cited to be the reasons for higher risk of prolonged and post-term pregnancy. Post term pregnancies are associated with various maternal and neonatal complications.Methods: A prospective study was carried out at Department of Obstetrics and Gynaecology, Command Hospital, Central Command, Lucknow. 100 patients were selected and divided into two groups and were followed up till the delivery.  Data so collected was subjected to analysis using Statistical Package for Social Sciences version 15.0.Results: Majority of women enrolled in the study were aged above 25 years. Majority of women enrolled in the study were primigravida (67%). The Mean BMI of women enrolled in the study was 24.2±3.43 kg/m2 and the expectant and control groups were matched demographically and anthropometrically. The compromised modified biophysical profile was recorded in 33 (66%) of women in expectant group. Rate of caesarean delivery was 30% in expectant and 46% in control group. In the expectant group, AFD was the most common indication for caesarean section while control group had NPOL as the most common indication for caesarean section. In the expectant group, mean AFI showed a declining trend with increasing gestational age.Conclusions: It was concluded that expectant management using modified biophysical profile (MBPP) does not provide an additional value over prophylactically managed pregnancies. Although cesarean rate and NICU admission rates were lower in expectant group as compared to control group yet the utility of MBPP in expectant management could not be proven and needs further assessment in larger studies or pooled clinical trials