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Wyświetlanie 1-15 z 17
Tytuł:
Two-stage instrumental variables identification of polynomial Wiener systems with invertible nonlinearities
Autorzy:
Janczak, Andrzej
Korbicz, Józef
Powiązania:
https://bibliotekanauki.pl/articles/330751.pdf
Data publikacji:
2019
Wydawca:
Uniwersytet Zielonogórski. Oficyna Wydawnicza
Tematy:
nonlinear system
parameter estimation
dynamic model
polynomial model
układ nieliniowy
estymacja parametru
model dynamiczny
model wielomianowy
Opis:
A new two-stage approach to the identification of polynomial Wiener systems is proposed. It is assumed that the linear dynamic system is described by a transfer function model, the memoryless nonlinear element is invertible and the inverse nonlinear function is a polynomial. Based on these assumptions and by introducing a new extended parametrization, the Wiener model is transformed into a linear-in-parameters form. In Stage I, parameters of the transformed Wiener model are estimated using the least squares (LS) and instrumental variables (IV) methods. Although the obtained parameter estimates are consistent, the number of parameters of the transformed Wiener model is much greater than that of the original one. Moreover, there is no unique relationship between parameters of the inverse nonlinear function and those of the transformed Wiener model. In Stage II, based on the assumption that the linear dynamic model is already known, parameters of the inverse nonlinear function are estimated uniquely using the IV method. In this way, not only is the parameter redundancy removed but also the parameter estimation accuracy is increased. A numerical example is included to demonstrate the practical effectiveness of the proposed approach.
Źródło:
International Journal of Applied Mathematics and Computer Science; 2019, 29, 3; 571-580
1641-876X
2083-8492
Pojawia się w:
International Journal of Applied Mathematics and Computer Science
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Zastosowanie teorii systemów dynamicznych o losowej strukturze w radiolokacji i radionawigacji
Autorzy:
Grišin, Jurij.
Janczak, Dariusz.
Zankiewicz, Andrzej.
Powiązania:
Biuletyn Wyższa Oficerska Szkoła Radiotechniczna, 1997, nr 1, s. 37-46
Data publikacji:
1997
Tematy:
Radiolokacja materiały konferencyjne
Radionawigacja materiały konferencyjne
Teoria systemów materiały konferencyjne
Opis:
Rys.; Bibliogr.; Streszcz.; Materiały z VIII Konferencji Naukowej "Sterowanie i Regulacja w Radiolokacji i Obiektach Latających".
Dostawca treści:
Bibliografia CBW
Artykuł
Tytuł:
Laparoscopic Appendectomy as an Alternative to Conventional Procedure – Results in our own Material
Autorzy:
Merenda, Marcin
Litarski, Andrzej
Kabziński, Piotr
Janczak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1396260.pdf
Data publikacji:
2013-06-01
Wydawca:
Index Copernicus International
Tematy:
laparoscopic appendectomy
minimally invasive surgery
Opis:
Appendectomies are the most common surgical procedures performed in the emergency surgery setting. Since more than one decade laparoscopic appendectomy appeared as an alternative procedure to commonly used conventional appendectomy as a recognized method of treatment of acute appendicitis. Despite multiple papers and studies comparing these techniques, still no clear indications and eligibility criteria exist for either of them. The aim of the study was to evaluate results of treatment of acute appendicitis using the laparoscopic method versus the conventional appendectomy, basing on parameters affecting treatment results and costs, such as duration of hospitalization, complications, use of medications. Material and methods. The analysis included patients who underwent surgical treatment for acute appendicitis at the Department of Surgery of 4th Military Clinical Hospital in Wrocław between 2006 and 2012. Since 2006, 128 laparoscopic appendectomies (group 1) were performed, while 189 patients underwent conventional procedure during this time (including 11 who underwent a diagnostic laparoscopy - group 2). The study was based on retrospective analysis of medical records of patients. Treatment results were evaluated basing on the following parameters: duration of hospitalization, amount of used analgesics, duration and type of antibiotic therapy, peri- and postoperative complications. Results and conclusions. Results obtained at our Clinic, similar to results obtained at other sites, warrant use of laparoscopic appendectomy. Use of minimally invasive techniques provides better treatment results, mainly with regard to shorter duration of hospitalization, lower use of antibiotics and analgesics, which also contributes to lower overall treatment costs.
Źródło:
Polish Journal of Surgery; 2013, 85, 6; 323-328
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Laparoscopic Treatment of Abdominal Hernia – 5 Years of Experience
Autorzy:
Litarski, Andrzej
Pawełczyk, Jerzy
Majcherek, Jarosław
Janczak, Dawid
Pawłowski, Lech
Rucińska, Zuzanna
Janczak, Dariusz
Powiązania:
https://bibliotekanauki.pl/articles/1395771.pdf
Data publikacji:
2014-08-01
Wydawca:
Index Copernicus International
Tematy:
abdominal hernia repair
laparoscopy
complications
Opis:
Laparoscopic surgery has become a well approved method of abdominal hernias treatment in recent years. Due to the advancement of laparoscopy and the use of improved synthetic materials laparoscopic surgery is characterized not only by low complication but also by a short period of recovery after surgery. The aim of the study was a retrospective analysis of the results of laparoscopic abdominal hernia surgeries (IPOM). Material and methods. Between year 2007 and 2012, 65 patients aged between 29 to 76 underwent laproscopic abdominal hernia surgeries due to either primary or postoperative abdominal hernias. All patients were examined in perioperative period, after 12 and 24 months after surgery in search of complications, pain and reccurence. Recovery period was also estimated. Results. In most cases postoperative pain was estimated from 1 to 4 on VAS scale. The most frequent complications were seromas that occured in 3 patients. The other complications were pneumothorax, wound hematoma and wound infection that occured once each. One patient required reoperation due to wound hematoma. Chronic postoperative pain was diagnosed in 3 patients and 4 recurrences were stated. Conclusions. Laparoscopic therapy of abdominal hernias is a safe operative method characterized by low recurrence and complication rates as well as short hospital stay and quick recovery. This technique is restricted by high material costs and the lack of full refund for the procedure.
Źródło:
Polish Journal of Surgery; 2014, 86, 8; 353-358
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The Use of Radioisotopic Tests for Diagnosing Lower Limb Venous Thrombosis – Own Research
Autorzy:
Janczak, Dariusz
Janczak, Piotr
Skóra, Jan
Dorobisz, Karolina
Merenda, Marcin
Litarski, Andrzej
Szyber, P.
Powiązania:
https://bibliotekanauki.pl/articles/1397020.pdf
Data publikacji:
2012-12-01
Wydawca:
Index Copernicus International
Tematy:
venous thrombosis
radioisotopic tests
Opis:
Inflammatory mediators play an important role in thrombosis etiopathology. Diagnostic radioisotopic tests can be used to assess the activity of thrombo-inflammatory process. The aim of the study was to assess the suitability of Tc-99m HMPAO labelled leukocyte scintigraphy in the diagnostics of deep vein thrombosis. Material and methods. The study covered 45 patients with lower limb deep vein thrombosis treated in 2009 at the Department of Vascular, General and Transplantological Surgery of the Wrocław Medical University. Scintigraphic test were performed during the first few days after the onset of symptoms and 8 weeks later. Results. All patients with active deep vein thrombosis had higher levels of TC-99m-HMPAO markers in sick limbs. After 8 weeks, 93% of patients still had elevated levels of radioisotope in limbs with an active thrombosis process. However, the levels of markers were clearly lower than in the acute phase of thrombosis. Conclusions. 1. In the chronic phase of thrombosis, 93% of patients still have higher levels of radioisotopic markers, which indicates an active inflammatory process. 2. Tc-99m HMPAO labelled leukocyte scintigraphy demonstrates high sensitivity in the diagnostics of deep vein thrombosis.
Źródło:
Polish Journal of Surgery; 2012, 84, 12; 605-612
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wrzód żylny goleni – leczenie zachowawcze i operacyjne
Autorzy:
Janczak, Dariusz
Garcarek, Jerzy
Szydełko, Tomasz
Janczak, Dawid
Pawełczyk, Jerzy
Kabziński, Piotr
Merenda, Marcin
Litarski, Andrzej
Malinowski, Maciej
Powiązania:
https://bibliotekanauki.pl/articles/552509.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Przyjaciół Medycyny Rodzinnej i Lekarzy Rodzinnych
Tematy:
owrzodzenie żylne
przewlekła niewydolność żylna
kompresjoterapia
Źródło:
Family Medicine & Primary Care Review; 2012, 1; 76-84
1734-3402
Pojawia się w:
Family Medicine & Primary Care Review
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Rusults of Classical Crawford and Hybrid Operations in Thoracic-Abdominal Aorta Aneursysms Treatment - Comperative Assesment
Autorzy:
Janczak, Dariusz
Skóra, Jan
Garcarek, Jerzy
Merenda, Marcin
Litarski, Andrzej
Powiązania:
https://bibliotekanauki.pl/articles/1396622.pdf
Data publikacji:
2012-02-01
Wydawca:
Index Copernicus International
Tematy:
thoracic-abdominal aortic aneurysms
hybrid procedures
stentgraft
Opis:
Thoracic-abdominal aortic aneurysms (TAAA) are still serious medical problem. Classical procedure requires two cavities approach and implantation of vascular prosthetic in the place of aneurysm - Crawford's procedure. Significant progress was made during last years by using endovascular procedures (stentgrafts). Alternative is hybrid procedure - prosthetic appliance of visceral and kidney arteries and then stentgraft implantation in whole thoracic-abdominal aorta.The aim of the study was comparative analysis of classical and hybrid procedures in thoracic-abdominal aneurysms treatment.Material and methods. Between 1989-2011 in Department of Vascular, General and Transplantological Surgery Medical University in Wrocław and Surgical Department of 4th Military Clinical Hospital in Wrocław 53 patients were operated due to thoracic-abdominal aortic aneurysms. Classical Crawford's procedure was performed in 41 patients (group I) and hybrid procedure was performed in 12 patients (group II). Additionally 7 patients required aortic arc branches reconstruction due to achieve optimal conditions to stentgraft amplantation. Procedures were performed at one or two stages.Results. Mortality in patients treated classically (group I) depended on type of aneurysm in Crawford's classification. In type I-II mortality rate was 54% ((7 deaths/12 patients), in type III do V 17% (5 deaths/ 29 patients). In the group after hybrid procedure (group II) mortality rate was 28% (2 deaths/ 7 patients) in type I-II and 20% (1 death/5 patients) in type III to V. Observed serious perioperative complications.Conclusions. 1. Endovascular procedures development enabled introducing of new methods in thoracic-abdominal aortic aneurysms treatment (hybrid procedures) and allowed to get better results. 2. Clear advantage of hybrid procedures above classical Crawford's procedure is observed in type I and II of TAAA. 3. Mortality and morbidity rates recommend hybrid procedure in type I and II of TAAA. 4. Surgical results of classical and hybrid procedures in type III-V TAAA treatment are comparative, with indication on classical approach.
Źródło:
Polish Journal of Surgery; 2012, 84, 3; 126-135
0032-373X
2299-2847
Pojawia się w:
Polish Journal of Surgery
Dostawca treści:
Biblioteka Nauki
Artykuł
Wyświetlanie 1-15 z 17

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