18 research outputs found
Array communications in wireless sensor networks
Imperial Users onl
Array communications in wireless sensor networks
EThOS - Electronic Theses Online ServiceGBUnited Kingdo
Deep Learning-Based Image Regression for Short-Term Solar Irradiance Forecasting on the Edge
Photovoltaic (PV) power production is characterized by high variability due to short-term meteorological effects such as cloud movements. These effects have a significant impact on the incident solar irradiance in PV parks. In order to control PV park performance, researchers have focused on Computer Vision and Deep Learning approaches to perform short-term irradiance forecasting using sky images. Motivated by the task of improving PV park control, the current work introduces the Image Regression Module, which produces irradiance values from sky images using image processing methods and Convolutional Neural Networks (CNNs). With the objective of enhancing the performance of CNN models on the task of irradiance estimation and forecasting, we propose an image processing method based on sun localization. Our findings show that the proposed method can consistently improve the accuracy of irradiance values produced by all the CNN models of our study, reducing the Root Mean Square Error by up to 10.44 W/m2 for the MobileNetV2 model. These findings indicate that future applications which utilize CNNs for irradiance forecasting should identify the position of the sun in the image in order to produce more accurate irradiance values. Moreover, the integration of the proposed models on an edge-oriented Field-Programmable Gate Array (FPGA) towards a smart PV park for the real-time control of PV production emphasizes their advantages
Inflammatory Pseudotumor of the Liver Presented in a Patient with Cholelithiasis
An inflammatory pseudotumor of the liver is a rare tumor-like lesion
consisting of an inflammatory infiltrate that often can mimic a
malignant liver neoplasm. The cause of an inflammatory pseudotumor of
the liver is unknown, but it has been reported to be associated with
different comorbid conditions most likely inflammatory or infectious in
origin. We present an 83-year-old female who presented with a
symptomatic gallstones disease and an incidental finding of inflammatory
pseudotumor mimicking intrahepatic cholangiocarcinoma in preoperative
liver imaging. Differentiating a pseudotumor from hepatic
space-occupying neoplasms is crucial since it is one of the most
important tumor-mimicking lesions. The imaging findings of this rare
tumor can pose diagnostic difficulties because of the amount of fibrosis
and cellular infiltration. If malignancy has been excluded, patients can
be treated conservatively with steroids and non-steroidal
anti-inflammatory drugs. However, complete surgical resection has been
the modality of treatment for most of the cases with an indeterminate
diagnosis
Low-grade Appendiceal Mucinous Neoplasm Presenting as Adnexal Mass: A Case Report
An appendiceal mucocele is a dilatation of the appendix and it is the
result of benign or malignant diseases, which cause the obstruction of
the appendix and the consequent accumulation of mucus secretion. The
preoperative diagnosis is difficult due to non-specific clinical
manifestations of the disease. We present a case of an 83-year-old
female patient with a history of breast cancer that was referred to our
hospital for an evaluation of a right adnexal mass discovered during her
yearly follow-up. The patient underwent an exploratory laparotomy with a
provisional diagnosis of a right adnexal mass. A perioperative,
appendiceal mucocele was diagnosed. She underwent a formal appendectomy
and histopathology of the specimen revealed a low-grade mucinous
neoplasm. Appendiceal mucinous neoplasms represent a rare form of
pathology among all appendectomy specimens. A preoperative diagnosis is
difficult due to the lack of specific symptoms and it is often
misdiagnosed as an adnexal mass. The perforation of the appendix and
subsequent extravasation of its contents into the abdominal cavity may
lead to pseudomyxoma peritonei, which has a very poor prognosis if not
treated properly
Effect of testis nondescent or orchidopexy on antisperm antibodies and testis histology in rats
Objective: To examine effects of nondescent of normal testis and of
various orchidopexy techniques on antisperm antibody (ASA) production
and histologic testicular lesions.
Design: Experimental cohort study.
Setting: Laboratories of surgical research and biology of reproduction,
academic medical centers.
Patient(s): Lewis rats, immature and adult.
Intervention(s): Eighteen-day-old rats (6 groups): intra-abdominal stay
of testis after closure of inguinal canal, classic dartos pouch
orchidopexy, orchidopexy by testis fixation through tunica albuginea,
orchidopexy by transparenchymal testicular fixation, sham operation, and
bilateral vasectomy. Adult rats (1 group): transparenchymal testicular
fixation.
Main Outcome Measure(s): The ASA-antiacrosome and antitail-were measured
by indirect immunofluorescence in sera collected preoperatively, on 50th
and 120th day in immature rats, and 90 days after surgery in adult rats.
Testicular histology was also examined at the end of sera collection.
Result(s): Neither intra-abdominal testicular localization nor
orchidopexies induced significant ASA. Testicular nondescent and
fixation (transparenchymal or transtunical) caused hypospermatogenesis;
dartos pouch was harmless. Bilateral vasectomy produced significantly
increased ASA, but no significant testicular lesions. Contralateral
testes were unaffected.
Conclusion(s): Intra-abdominal testicular stay and orchidopexy do not
elicit autoimmune response to sperm; histologic testicular lesions might
not be associated with ASA. In operated cryptorchids, ASA are probably
due to other reason than testicular heat or orchidopexy trauma. (Fertil
Steril (R) 2010;94:1504-9. (C) 2010 by American Society for Reproductive
Medicine.
Granuloma Mimicking Local Recurrence on PET/CT after Liver Resection of Colorectal Liver Metastasis: A Case Report.
Positron emission tomography-computed tomography (PET/CT) improves the diagnostic interpretation of fluorine-18 fluorodeoxyglucose (18F-FDG ) PET and CT in oncologic patients and has an impact on both diagnostic and therapeutic aspects of patient management. However, false positive findings from the PET/CT imaging should be taken into consideration as they mislead physicians into improper therapeutic actions. We present a 48-year-old female patient with a history of left colectomy for colorectal cancer and subsequent liver metastasectomy. After one year of follow-up, she presented with a highly suspicious lesion in the liver, which was confirmed on PET/CT as a metastatic liver tumor. Consequently, the patient underwent surgical excision of the tumor, and the definitive histological diagnosis showed a granulomatous tissue with giant cells and foreign body tissue reaction. Based on this report, we briefly review the dangerous pitfalls from radiological and PET/CT imaging concerning the preoperative diagnostic workup examination, as they may significantly alter the treatment plan in oncologic patients
Biliary Mucinous Cystic Neoplasm of the Liver with Ovarian Stroma and Elevated Serum and Cystic Fluid Cancer Antigen 19-9 Levels
Biliary mucinous cystic neoplasms of the liver are rare cystic tumors
comprising less than 5% of the liver cystic neoplasms. These tumors
demonstrate a female predominance and entail a risk of malignant
transformation. We present a 56-year-old female patient with a
multiloculated liver cystic lesion measuring 22 cm who underwent a
cystectomy with en bloc resection of the liver segments II, III, and
cholecystectomy. Serum cancer antigen 19.9 was 4,122.00 U/ml, supporting
the diagnosis of a biliary cystic tumor. The cytology of the cystic
fluid was negative for malignancy and intracystic fluid cancer antigen
19.9 level was measured over 12,000.00 U/l. The patient is free of
recurrence at one-year follow up. Although a rare entity, the biliary
mucinous cystic neoplasms should be considered in the differential
diagnosis in the patients with liver cystic tumors. The appropriate
management with complete surgical resection with negative margins is
recommended given the risk of recurrence and malignant transformation