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Tytuł:
Role of intraoperative neuromonitoring of the recurrent laryngeal nerves during thyroid reoperations of recurrent goiter
Autorzy:
Sopiński, Jan
Kuzdak, Krzysztof
Hedayati, Masoud
Kołomecki, Krzysztof
Powiązania:
https://bibliotekanauki.pl/articles/1393574.pdf
Data publikacji:
2017
Wydawca:
Index Copernicus International
Tematy:
recurrent goiter
recurrent laryngeal nerve
intraoperative neuromonitoring
Opis:
Reoperations of the thyroid gland are challenging to any surgeon. Such procedures are technically difficult and involve higher risk of complications than primary procedures. Recurrent laryngeal nerve (RLN) palsy is one of such complications The aim of the study was to evaluate the effectiveness of intraoperative neuromonitoring (IONM) in preventing RLN palsy during recurrent goiter operations. Material and methods. We retrospectively analyzed the results of thyroid reoperation performed at the Department of Endocrine, General and Vascular Surgery of Medical University of Lodz in the period from January 2014 to June 2016. The study included 80 patients, who were divided into 2 groups: group A consisted of 27 patients, who had undergone surgery with the use of IONM, while group B included 53 patients, in whom RLN was identified visually. During statistical analysis we took into account the number of nerves at risk, not the number of patients. There were 47 nerves at risk In group A and 86 in group B. We analyzed whether application of IONM had any effect on the frequency of RLN palsy and procedure duration. Results. The frequency of RLN palsy was 10.64% (5/47) in group A and 15.12% (13/86) in group B (no statistical significance, p=0,47). Mean operation time was shorter in group B 71.29 ± 17.125 minutes vs. 75.75 ± 17.94 minutes in group A (no statistical significance, p=0,377). Conclusion. Use of IONM did not significantly reduce the occurrence of RLN palsy and procedure duration.
Źródło:
Polish Journal of Surgery; 2017, 89, 3; 11-15
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Non-Recurrent Laryngeal Nerve
Autorzy:
Buła, Grzegorz
Mucha, Ryszard
Paliga, Michał
Koziołek, Henryk
Niedzielski, Zbigniew
Gawrychowski, Jacek
Powiązania:
https://bibliotekanauki.pl/articles/1395664.pdf
Data publikacji:
2015-07-01
Wydawca:
Index Copernicus International
Tematy:
nodular goiter
recurrent laryngeal nerve
Opis:
The aim of the study was to assess the frequency of non-recurrent laryngeal nerves (Non-RLN). Material and methods. A total of 6110 patients were operated in our hospital between 1 January 2005 and 31 December 2013 for various goiters (5429) and various types of hyperparathyroidism (618). Laryngeal nerve was exposed during operation in 1700 patients from superior aperture of the chest to superior aperture of the larynx. Identification process of RLN was started with dissecting inferior thyroid artery (ITA) and its junction with the nerve. Then main trunk of the nerve was exposed backwards till the region of superior aperture of the chest together with the end portion till the nerve outlet to the larynx. Results. In the group of 1700 patients, RLN was exposed bilaterally in 1400 (82.4%) and unilaterally in 300 (17.6%). In the group of 3100 dissected RLNs the course of RLN was observed on the right side in 1710 patients and on the left in 1390. Irreversible nature RLN was shown in four cases (0.1%) – four women (02%) aged 42-55 (mean 49.3) – three operated for non-toxic nodular goiter and one for primary hyperparathyroidism. Each time the Non-RLN was seen on the right side. The other patients manifested recurrent character RLN. Moreover, interstitial course of RLN was found on the left side in one man. Conclusion. Non recurrent laryngeal nerve is a rare anatomical variation, occurring more frequently on the right side. Surgeon during surgery of the thyroid and parathyroid glands should be aware of its existence to avoid damage.
Źródło:
Polish Journal of Surgery; 2015, 87, 7; 336-339
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Treatment of Recurrent Primary Spontaneous Pneumothorax – Own Experience
Autorzy:
Tomczyk, Grażyna
Pawełczyk, Konrad
Marciniak, Marek
Rzechonek, Adam
Kołodziej, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1396014.pdf
Data publikacji:
2013-01-01
Wydawca:
Index Copernicus International
Tematy:
spontaneous pneumothorax
recurrent pneumothorax
videothoracoscopy
Opis:
Primary spontaneous pneumothorax could be a serious therapeutic problem in case of recurrence. Lack of therapeutic standards sometimes leads to delay in definitive surgical treatment and could cause respiratory complications. The aim of the studywas the evaluation of treatment results in patients with recurrence of primary spontaneous pneumothorax and looking for optimal therapeutic method after first recurrence (surgical treatment vs. pleural drainage). Material and methods.Between 01.01.2009 and 31.07.2010 fifty four patients with recurrent primary spontaneous pneumothorax was hospitalized in Wrocław Thoracic Surgery Centre (24.3% of all patients with pneumothorax). The recurrence was treated surgically in 24 cases, in 30 pleural drainage was performed: simple drainage (n=14) or drainage with chemical pleurodesis (n=16). Mean age of patients treated without surgery was higher than surgically treated (p=0,012). Results.In surgery group no recurrence was found, in drainage group 11 recurrences occurred (p=0.0009). In group of 11 patients with second recurrence, pleurodesis was performed four times (36%) vs. 12 times (63%) in 19 patients without a recurrence of the disease. 70% of non-surgically treated patients vs. 50% of surgically treated were afraid of recurrence (p=0.01). Among 11 patients in drainage group, nine underwent surgery at the second episode of recurrence. Conclusions.The optimal treatment method in case of first recurrence of primary spontaneous pneumothorax is surgical treatment. When it is not possible chemical pleurodesis should be performed during pleural drainage. Most of the patients after second recurrence are treated surgically anyway. The surgical treatment significantly reduces patient’s fears for future recurrence of the disease. Younger patients are most often surgically treated.
Źródło:
Polish Journal of Surgery; 2013, 85, 1; 12-19
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Monitoring regenerative heat exchanger in steam power plant by making use of the recurrent neural network
Autorzy:
Niksa-Rynkiewicz, Tacjana
Szewczuk-Krypa, Natalia
Witkowska, Anna
Cpałka, Krzysztof
Zalasiński, Marcin
Cader, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/2031128.pdf
Data publikacji:
2021
Wydawca:
Społeczna Akademia Nauk w Łodzi. Polskie Towarzystwo Sieci Neuronowych
Tematy:
recurrent neural network
intelligent industrial monitoring
Almeida–Pineda recurrent back-propagation
regenerative heat exchanger
steam power plant
Opis:
Artificial Intelligence algorithms are being increasingly used in industrial applications. Their important function is to support operation of diagnostic systems. This paper presents a new approach to the monitoring of a regenerative heat exchanger in a steam power plant, which is based on a specific use of the Recurrent Neural Network (RNN). The proposed approach was tested using real data. This approach can be easily adapted to similar monitoring applications of other industrial dynamic objects.
Źródło:
Journal of Artificial Intelligence and Soft Computing Research; 2021, 11, 2; 143-155
2083-2567
2449-6499
Pojawia się w:
Journal of Artificial Intelligence and Soft Computing Research
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
OK-432 treatment of pediatric patients with recurrent thyroglossal duct cyst after surgery
Autorzy:
Ohta, Nobuo
Fukase, Shigeru
Nakazumi, Miho
Sato, Teruyuki
Suzuki, Takahiro
Powiązania:
https://bibliotekanauki.pl/articles/23203233.pdf
Data publikacji:
2021-06-01
Wydawca:
Index Copernicus International
Tematy:
OK-432
recurrent thyroglossal duct cyst
surgery
Opis:
Introduction: Recurrent thyroglossal duct cyst after surgery is not a rare condition and first-line treatment has not been established yet. Aim: Evaluation of outcomes and complications of OK-432 treatment in patients with recurrent thyroglossal duct cyst after surgery. Material and methods: This study is designed as a case series with planned data collection at Tohoku Medical and Pharmaceutical University and Fukase Clinic. Five patients with recurrent thyroglossal duct cyst after surgery received this therapy between January 2014 and February 2020 on an outpatient basis, without hospitalization. OK-432 solution was injected into the lesion using an 18- or 27-gauge needle, depending on the location and size of the lesion, as well as on possible complications. Results: Lesions showed marked reduction or total shrinkage in all patients, with no local scarring or deformity at the injection site. Side effects manifested as local pain at the site of injection and fever (37.5–38.5°C) observed in three patients, but the symptoms resolved within a few days. Conclusions: Since OK-432 therapy is simple, easy, safe and effective, it can be used as an alternative to surgery in the treatment of recurrent thyroglossal duct cyst after surgery.
Źródło:
Polish Journal of Otolaryngology; 2021, 75, 6; 28-32
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Open mesh repair of a voluminous recurrent inguinal hernia complicated by strangulation and intestinal obstruction
Autorzy:
Edeh, Anthony Jude
Nwangwu, Chukwuemeka Chijioke
Okenwa, Wilfred Okwudili
Anekpo, Chijioke Chinedu
Eze, Balantine Ugochukwu Nicholas
Basil-Nwachukwu, Chinonso Chibueze
Powiązania:
https://bibliotekanauki.pl/articles/454908.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Rzeszowski. Wydawnictwo Uniwersytetu Rzeszowskiego
Tematy:
Inguinal hernia
recurrent
voluminous
strangulated
mesh repair
Opis:
Introduction. Inguinal hernia is a common surgical pathology in Nigeria but a giant (voluminous) recurrent strangulated inguino-scrotal hernia causing intestinal obstruction is very uncommon. Such a hernia, when it is recurrent and becomes complicated with strangulation and dynamic intestinal obstruction, presents many difficulties in management. Aim. To present the successful management of a case of a strangulated and obstructed giant recurrent inguinal hernia. Description of the case. Here we present the case of 47 year old man who had intestinal resection and anastomosis with prolene mesh repair of the posterior wall for a strangulated recurrent large inguinal hernia using the technique of tension free sutured prolene mesh popularized by Lichtenstein Conclusion. The patient recovered, was satisfied with his care and has been symptom free at 18 months of follow up. Giant recurrent hernias complicated by strangulated and intestinal obstruction are uncommon in Nigeria today, despite our resource-poor status. When they occur, tension free repair with sutured onlay prolene mesh after Lichtenstein, can be a useful and the best option with satisfactory results, as in the case reported.
Źródło:
European Journal of Clinical and Experimental Medicine; 2019, 3; 270-273
2544-2406
2544-1361
Pojawia się w:
European Journal of Clinical and Experimental Medicine
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Recurrent strings in corpus-based pedagogical research: A reappraisal of the field
Autorzy:
Gozdawa-Gołębiowski, Romuald
Opacki, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/912427.pdf
Data publikacji:
2018-12-07
Wydawca:
Uniwersytet im. Adama Mickiewicza w Poznaniu
Tematy:
formulaicity
recurrent strings
corpus linguistics
frequency
distribution
Opis:
Formulaic competence is a hotly debated issue in teaching circles, not only because of its role in L2 communication but also due to the inherent complexity of the identification criteria for formulaic strings. While the mixed approach, combining meaning-based and corpus- based identification measures, remains a natural solution, the subjective character of the criteria, together with the required involvement of native experts, diminishes its attractiveness for every-day pedagogical purposes. We would like to explore the potential of “corpus-only” identification tools. Specifically, our objective is to show that meaningless n-grams (of the, in a, etc.) generated by frequency searches contain useful pedagogical data, and that, coupled with MI scores frequency-based measures accurately characterize learners’ formulaic competence. Because of the relative simplicity of the identification procedure and free availability of corpus tools, frequency-based and distribution-based measures may become an important new pedagogical tool at the disposal of language teachers
Źródło:
Glottodidactica. An International Journal of Applied Linguistics; 2018, 45, 2; 134-149
0072-4769
Pojawia się w:
Glottodidactica. An International Journal of Applied Linguistics
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Evaluation of the Learning Curve for Intraoperative Neural Monitoring of the Recurrent Laryngeal Nerves in Thyroid Surgery
Autorzy:
Pragacz, Krzysztof
Barczyński, Marcin
Powiązania:
https://bibliotekanauki.pl/articles/1396001.pdf
Data publikacji:
2015-03-01
Wydawca:
Index Copernicus International
Tematy:
thyroid surgery
intraoperative neuromonitoring
recurrent laryngeal nerve
Opis:
Intraoperative neuromonitoring facilitates identification of the recurrent laryngeal nerves (RLN) and allows for predicting their postoperative function. Nevertheless, the outcome of thyroid surgery monitoring is affected by both the experience of the operator and his mastering of the technique. The aim of the study was the assessment of the learning curve for intraoperative RLN neuromonitoring. Material and methods. The prospective analysis included 100 consecutive thyroid operations performed by a single surgeon during implementation of RLN neuromonitoring in a district surgical ward in Staszów. RLN neuromonitoring was performed in keeping with the recommendations of the International Neural Monitoring Study Group using a C2 NerveMonitor (Inomed, Germany). The outcomes of initial 50 procedures (group I: 08/2012-07/2013) were compared with the results of subsequent 50 operations (group II: 08/2013-07/2014). The evaluation included demographic and intraoperative data along with predictive value of the method and complications. Results. In group II as compared to group I, a significant reduction of operative time was noted (102.1±19.4 vs 109.9±19; p=0.045), along with an increased percentage of identified RLNs (99% vs 89.2%; p=0.006), a decreased percentage of correction-requiring technical errors (8% vs 24%; p=0.029), an improved negative predictive (99% vs 89.3%; p<0.001) and positive value (75% vs 55.6%; p<0.001), as well as a decreased percentage of RLN injuries (3% vs 14%; p=0.006). Conclusions. Mastering the technique of intraoperative RLN neuromonitoring in thyroid surgery requires the surgeon to perform independently approximately 50 monitored procedures, what allows for achieving the predictive value of the method that is comparable to outcomes published by referral centers.
Źródło:
Polish Journal of Surgery; 2014, 86, 12; 584-593
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Outcomes of bevacizumab and cidofovir treatment in HPV-associated recurrent respiratory papillomatosis – review of the literature.
Autorzy:
Jackowska, Joanna
Piersiala, Krzysztof
Klimza, Hanna
Wierzbicka, Małgorzata
Powiązania:
https://bibliotekanauki.pl/articles/1398291.pdf
Data publikacji:
2018
Wydawca:
Index Copernicus International
Tematy:
recurrent respiratory papillomatosis
cidofovir
bevacizumab
adjuvant treatment
Opis:
Objective: Recurrent respiratory papillomatosis (RRP) is caused by types 6 and 11 human papilloma virus and occurs in both children and adults. It is characterized by proliferation of benign squamous cell papillomas within the aerodigestive tract. The problem with recurrent respiratory papillomatosis treatment is high recurrence of papilloma growth following surgical removal. Method: A literature review was carried out via surveys based on electronic data in public domains: MedLine (USA National Library of Medicine), PubMed and SciELO, using keywords such as: recurrent respiratory papillomatosis, adjuvant treatment, cidofovir, and bevacizumab. All types of papers written in English were included (cross-sectional, prospective and retrospective clinical trials, review papers, and case reports). Results: In the recent literature, several types of treatment such as surgery with mechanical debulking or laser and adjuvant therapies are mentioned. Intralesional bevacizumab and cidofovir treatment may increase the interval between surgical procedures and decrease the number of procedures per year. Conclusions: There is still an ongoing discussion within the European Laryngological Society regarding the balance between effectiveness and side effects of RRP adjuvant treatment, however, recent results show promising long-term effects. Bevacizumab and cidofovir in aggressive RRP give hope for improved treatment outcomes.
Źródło:
Polish Journal of Otolaryngology; 2018, 72, 4; 1-8
0030-6657
2300-8423
Pojawia się w:
Polish Journal of Otolaryngology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A comparative study of CNN, LSTM, BiLSTM, AND GRU architectures for tool wear prediction in milling processes
Autorzy:
Zegarra, Fabio C.
Vargas-Machuca, Juan
Coronado, Alberto M.
Powiązania:
https://bibliotekanauki.pl/articles/28407329.pdf
Data publikacji:
2023
Wydawca:
Wrocławska Rada Federacji Stowarzyszeń Naukowo-Technicznych
Tematy:
tool wear
feature extraction
preprocessing
recurrent neural network
Opis:
Accurately predicting machine tool wear requires models capable of capturing complex, nonlinear interactions in multivariate time series inputs. Recurrent neural networks (RNNs) are well-suited to this task, owing to their memory mechanisms and capacity to construct highly complex models. In particular, LSTM, BiLSTM, and GRU architectures have shown promise in wear prediction. This study demonstrates that RNNs can automatically extract relevant information from time series data, resulting in highly precise wear models with minimal feature engineering. Notably, this approach avoids the need for excessively large window sizes of data points during model training, which would increase model complexity and processing time. Instead, this study proposes a procedure that achieves low prediction errors with window sizes as small as 100 data points. By employing Bayesian hyperparameter optimization and two preprocessing techniques (detrend and offset), RMSE errors consistently fall below 10. A key difference in this study is the use of boxplots to provide a better representation of result variability, as opposed to solely reporting the best values. The proposed approach matches more complex state of-the-art. methods and offers a powerful tool for wear prediction in engineering applications.
Źródło:
Journal of Machine Engineering; 2023, 23, 4; 122--136
1895-7595
2391-8071
Pojawia się w:
Journal of Machine Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Topological approach to chain recurrence in continuous dynamical systems
Autorzy:
Oprocha, P.
Powiązania:
https://bibliotekanauki.pl/articles/255230.pdf
Data publikacji:
2005
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH
Tematy:
chain-recurrent set
continuous dynamical system
flow
attractor
Opis:
In this paper we present equivalent definitions of chain recurrent set for continuous dynamical systems. This definition allow us to define chain recurrent set in topological spaces.
Źródło:
Opuscula Mathematica; 2005, 25, 2; 261-268
1232-9274
2300-6919
Pojawia się w:
Opuscula Mathematica
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Detection and Localization of Audio Event for Home Surveillance Using CRNN
Autorzy:
Suruthhi, V. S.
Smita, V.
Rolant Gini, J.
Ramachandran, K. I.
Powiązania:
https://bibliotekanauki.pl/articles/2055274.pdf
Data publikacji:
2021
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
convolutional recurrent neural network
CRNN
gated recurrent unit
GRU
long short-term memory
LSTM
sound event localization and detection
SELD
Opis:
Safety and security have been a prime priority in people’s lives, and having a surveillance system at home keeps people and their property more secured. In this paper, an audio surveillance system has been proposed that does both the detection and localization of the audio or sound events. The combined task of detecting and localizing the audio events is known as Sound Event Localization and Detection (SELD). The SELD in this work is executed through Convolutional Recurrent Neural Network (CRNN) architecture. CRNN is a stacked layer of convolutional neural network (CNN), recurrent neural network (RNN) and fully connected neural network (FNN). The CRNN takes multichannel audio as input, extracts features and does the detection and localization of the input audio events in parallel. The SELD results obtained by CRNN with the gated recurrent unit (GRU) and with long short-term memory (LSTM) unit are compared and discussed in this paper. The SELD results of CRNN with LSTM unit gives 75% F1 score and 82.8% frame recall for one overlapping sound. Therefore, the proposed audio surveillance system that uses LSTM unit produces better detection and overall performance for one overlapping sound.
Źródło:
International Journal of Electronics and Telecommunications; 2021, 67, 4; 735--741
2300-1933
Pojawia się w:
International Journal of Electronics and Telecommunications
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Forecasting future values of time series using the lstm network on the example of currencies and WIG20 companies
Prognozowanie przyszłych wartości szeregów czasowych z wykorzystaniem sieci lstm na przykładzie kursów walut i spółek WIG20
Autorzy:
Mróz, Bartosz
Nowicki, Filip
Powiązania:
https://bibliotekanauki.pl/articles/2016294.pdf
Data publikacji:
2020
Wydawca:
Politechnika Bydgoska im. Jana i Jędrzeja Śniadeckich. Wydawnictwo PB
Tematy:
recurrent neural network
RNN
gated recurrent unit
GRU
long short-term memory
LSTM
rekurencyjna sieć neuronowa
blok rekurencyjny
pamięć długookresowa
Opis:
The article presents a comparison of the RNN, GRU and LSTM networks in predicting future values of time series on the example of currencies and listed companies. The stages of creating an application which is a implementation of the analyzed issue were also shown – the selection of networks, technologies, selection of optimal network parameters. Additionally, two conducted experiments were discussed. The first was to predict the next values of WIG20 companies, exchange rates and cryptocurrencies. The second was based on investments in cryptocurrencies guided solely by the predictions of artificial intelligence. This was to check whether the investments guided by the predictions of such a program have a chance of effective earnings. The discussion of the results of the experiment includes an analysis of various interesting phenomena that occurred during its duration and a comprehensive presentation of the relatively high efficiency of the proposed solution, along with all kinds of graphs and comparisons with real data. The difficulties that occurred during the experiments, such as coronavirus or socio-economic events, such as riots in the USA, were also analyzed. Finally, elements were proposed that should be improved or included in future versions of the solution – taking into account world events, market anomalies and the use of supervised learning.
W artykule przedstawiono porównanie sieci RNN, GRU i LSTM w przewidywaniu przyszłych wartości szeregów czasowych na przykładzie walut i spółek giełdowych. Przedstawiono również etapy tworzenia aplikacji będącej realizacją analizowanego zagadnienia – dobór sieci, technologii, dobór optymalnych parametrów sieci. Dodatkowo omówiono dwa przeprowadzone eksperymenty. Pierwszym było przewidywanie kolejnych wartości spółek z WIG20, kursów walut i kryptowalut. Drugi opierał się na inwestycjach w kryptowaluty, kierując się wyłącznie przewidywaniami sztucznej inteligencji. Miało to na celu sprawdzenie, czy inwestowanie na podstawie przewidywania takiego programu pozwala na efektywne zarobki. Omówienie wyników eksperymentu obejmuje analizę różnych ciekawych zjawisk, które wystąpiły w czasie jego trwania oraz kompleksowe przedstawienie relatywnie wysokiej skuteczności proponowanego rozwiązania wraz z wszelkiego rodzaju wykresami i porównaniami z rzeczywistymi danymi. Analizowano również trudności, które wystąpiły podczas eksperymentów, takie jak koronawirus, wydarzenia społeczno-gospodarcze czy zamieszki w USA. Na koniec zaproponowano elementy, które należałoby ulepszyć lub uwzględnić w przyszłych wersjach rozwiązania, uwzględniając wydarzenia na świecie, anomalie rynkowe oraz wykorzystanie uczenia się nadzorowanego.
Źródło:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy; 2020, 24; 13-30
1899-0088
Pojawia się w:
Zeszyty Naukowe. Telekomunikacja i Elektronika / Uniwersytet Technologiczno-Przyrodniczy w Bydgoszczy
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
A new cast-resin transformer thermal model based on recurrent neural networks
Autorzy:
Azizian, D.
Bigdeli, M.
Powiązania:
https://bibliotekanauki.pl/articles/141202.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
cast-resin transformer
dynamics
recurrent neural networks
thermal modeling
Opis:
Thermal modeling in the transient condition is very important for cast-resin dry-type transformers. In the present research, two novel dynamic thermal models have been introduced for the cast-resin dry-type transformer. These models are based on two artificial neural networks: the Elman recurrent networks (ELRN) and the nonlinear autoregressive model process with exogenous input (NARX). Using the experimental data, the introduced neural network thermal models have been trained. By selecting a typical transformer, the trained thermal models are validated using additional experimental results and the traditional thermal models. It is shown that the introduced neural network based thermal models have a good performance in temperature prediction of the winding and the cooling air in the cast-resin dry-type transformer. The introduced thermal models are more accurate for the temperature analysis of this transformer and they will be trained easily. Finally, the trained and validated thermal models are employed to evaluate the life-time and the reliability of a typical cast-resin dry-type transformer.
Źródło:
Archives of Electrical Engineering; 2017, 66, 1; 17-28
1427-4221
2300-2506
Pojawia się w:
Archives of Electrical Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Epidemiological Characteristic of Acute Pancreatitis in Trzebnica District
Autorzy:
Bogdan, Justyna
Elsaftawy, Ahmed
Kaczmarzyk, Janusz
Jabłecki, Jerzy
Powiązania:
https://bibliotekanauki.pl/articles/1396706.pdf
Data publikacji:
2012-02-01
Wydawca:
Index Copernicus International
Tematy:
acute pancreatitis
etiology
severe acute pancreatitis
recurrent pancreatitis
treatment
Opis:
Acute pancreatitis is one of the most common surgical disease, and thus cause of hospitalization. Incidence and etiology of this condition demonstrates large regional differences. This situation is a substantial financial burden forhospital district, and changes in organization structure and funding medical service should be taken under consideration.The aim of the study was to record the epidemiology with etiology, diagnosis and treatment of acute pancreatitis in large district (77 000 inhabitants).Material and methods. A meta-analysis study of all 298 patients admitted to Hospital St Hedwig in Trzebnica, in the six-year period from 2005 to 2010, with acute pancreatitis was performed.Results. Acute pancreatitis was diagnosed in 298 patients in the six - year period, giving an estimated incidence of 64.4 per 100 000. Among the group of 441 admissions for acute pancreatitis in 298 patients was confirmed. Severe acute pancreatitis developed in 22.5% (67/298) of patients, more often in males 56/208 (27%) than in females 11/90 (12%). Gallstones were found as an etiological factor in 27% (80/298), and alcohol intake in 49% of patients. 211/298 (70%) patients had only one attack, whereas 29% (87/298) were readmitted with 230 relapses. The risk of recurrent pancreatitis was 48% in alcohol induced and 6,25% in gallstone induced pancreatitis. 53/298 patients (17%) were operated, ERCP procedures were performed in 24.Performed operations: necrosectomy in 25/53 (47%), elective cholecystectomy in 16/53 (30%), open drainage of abdominal abscess in 5/53 (9%), open drainage of cysts in 5/53 (9%), Jurasz's operation in 2/53 (3%). Majority surgical treatment was carried out in 68% cases with severe acute pancreatitis. Mortality due to acute pancreatitis was 3% (10/298); 15% in severe pancreatitis.Conclusions. 1. Acute pancreatitis continues to be an important clinical problem. 2. Severe, necrotic acute pancreatitis is associated with high mortality rates. 3. The ethanol-intake-related episodes of acute pancreatitits are much more prevalent than the gall-stone-related ones. 4. After the exclusion of ethanol- and gall-stones-related etiologies, the subsequent diagnostic process should aim at excluding neoplastic process of the head of pancreas.
Źródło:
Polish Journal of Surgery; 2012, 84, 2; 70-75
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 78

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