4,611 research outputs found
Effects of rat- prolactin 0n ingestive behavior and leptin levels in adult male rats
Previous studies have indicated that ovine- or bovine-prolactin stimulates ingestive behavior in female, but not in male rats; i.e., that prolactin has sex-specific effects on ingestive behavior. The question addressed here was whether ingestivebehavior in male rats would be induced by rat-prolactin. In a preliminary test male rats were allowed to ingest a 1 M solution of sucrose from a drinking spout. After daily intake of sucrose became stabilized, the males received rat-prolactin by pituitary grafting. The results showed that pituitary grafling both stimulates ingestive behavior and increases serum leptin levels in male rats. These findings coupled with previous findings suggest that proinctin has species-specific effects on ingestivc behavior
Bleeding classification of enhanced wireless capsule endoscopy images using deep convolutional neural network
This paper investigates the performance of a Deep Convolutional Neural Network (DCNN) algorithm to identify bleeding areas of wireless capsule endoscopy (WCE) images without known prior knowledge of bleeding and normal features of the images. In this study, a pre-processing technique has been proposed to improve the classification accuracy of WCE images into bleeding areas and normal areas by enhancing the WCE images. The proposed technique is applied to WCE images from six cases and divided into one training case and five test cases. To evaluate the effectiveness of the processes, the results were then compared between DCNN, SVM and Fuzzy, and also between DCNN with completely enhanced images and DCNN with normalized images. DCNN has shown to give a better result compared to SVM and Fuzzy logic; and the latter experiment has shown that the WCE images that have undergone the proposed enhancement technique gives better classification result compared to those images that did not go through the technique. The specificity, sensitivity and average are 0.8703, 0.8271 and 0.8907 respectively. In conclusion, DCNN has been proven to be able to successfully detecting bleeding areas from images without having any specific knowledge on imaging diagnosis or pathology
Deep Selection: A Fully Supervised Camera Selection Network for Surgery Recordings
Recording surgery in operating rooms is an essential task for education and
evaluation of medical treatment. However, recording the desired targets, such
as the surgery field, surgical tools, or doctor's hands, is difficult because
the targets are heavily occluded during surgery. We use a recording system in
which multiple cameras are embedded in the surgical lamp, and we assume that at
least one camera is recording the target without occlusion at any given time.
As the embedded cameras obtain multiple video sequences, we address the task of
selecting the camera with the best view of the surgery. Unlike the conventional
method, which selects the camera based on the area size of the surgery field,
we propose a deep neural network that predicts the camera selection probability
from multiple video sequences by learning the supervision of the expert
annotation. We created a dataset in which six different types of plastic
surgery are recorded, and we provided the annotation of camera switching. Our
experiments show that our approach successfully switched between cameras and
outperformed three baseline methods.Comment: MICCAI 202
Vector Mesons in Nuclear Medium
We summarize the current theoretical and experimental status of the spectral
change of the vector mesons in dense matter.Comment: 4 pages, Latex, talk at Quark Matter '9
Emergence of inhomogeneous moments from spin liquid in the triangular-lattice Mott insulator -(ET)Cu(CN)
The static and dynamic local spin susceptibility of the organic Mott
insulator -(ET)Cu(CN), a model material of the spin- 1/2
triangular lattice, is studied by C NMR spectroscopy from room
temperature down to 20 mK. We observe an anomalous field-dependent spectral
broadening with the continuous and bipolar shift distribution, appearing
without the critical spin fluctuations. It is attributable to spatially
nonuniform magnetizations induced in the spin liquid under magnetic fields. The
amplitude of the magnetization levels off below 1 K, while the low-lying spin
fluctuations survive toward the ground state, as indicated by the temperature
profile of the relaxation rates.Comment: 4 pages, 4 figure
Phosphorous Uptake from Organic Matter via AM fungi : Possible Involvement of Phytate-Degrading Bacteria
Poster Sessio
Off-Policy Evaluation of Ranking Policies under Diverse User Behavior
Ranking interfaces are everywhere in online platforms. There is thus an ever
growing interest in their Off-Policy Evaluation (OPE), aiming towards an
accurate performance evaluation of ranking policies using logged data. A
de-facto approach for OPE is Inverse Propensity Scoring (IPS), which provides
an unbiased and consistent value estimate. However, it becomes extremely
inaccurate in the ranking setup due to its high variance under large action
spaces. To deal with this problem, previous studies assume either independent
or cascade user behavior, resulting in some ranking versions of IPS. While
these estimators are somewhat effective in reducing the variance, all existing
estimators apply a single universal assumption to every user, causing excessive
bias and variance. Therefore, this work explores a far more general formulation
where user behavior is diverse and can vary depending on the user context. We
show that the resulting estimator, which we call Adaptive IPS (AIPS), can be
unbiased under any complex user behavior. Moreover, AIPS achieves the minimum
variance among all unbiased estimators based on IPS. We further develop a
procedure to identify the appropriate user behavior model to minimize the mean
squared error (MSE) of AIPS in a data-driven fashion. Extensive experiments
demonstrate that the empirical accuracy improvement can be significant,
enabling effective OPE of ranking systems even under diverse user behavior.Comment: KDD2023 Research trac
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