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Open access

Marcin Bednarek and Tadeusz Dąbrowski

Abstract

Industrial networks combine elements of distributed control systems. These elements are process stations, operator stations, engineering stations and other elements, which enable the exchange of data between industrial systems. Industrial systems are used to send process variable values and other data exchanged between the stations - elements of a distributed control system and SCADA systems. The fitness of an entire station system depends on the fitness of the communication system. This is why industrial networks are characterized by high reliability. When speaking about the fitness of a data transmission system, we can consider its instantaneous fitness (functional) or interval fitness (task-related). It is not always necessary to maintain instantaneous fitness. Sometimes interval fitness is enough. The paper discusses the issue of a need to maintain one of them, relative to various types of data transmission.

Open access

Tadeusz Dąbrowski, Marcin Bednarek and Michał Wiśnios

Abstract

The article is devoted to the illustration of the relationship of the operation system state assessment in the reliability and economic aspect on a type of information on the state of the object intended for the implementation of an operational task, on the reliability of this object, on the operational task properties (i.e. on the required effect size and the time for its manufacture), on the nature of relationships between a producer and a recipient of the effect. The proposed model of the operation system, as well as a model of the operation process and models of typical operational situations make it possible to find conclusions on a criterion of reliability and economic usability of the operation system.

Open access

Marcin Bednarek and Dąbrowski2 Dąbrowski

Abstract

The concept of security data transmission in a mobile diagnostic system composed of the process stations (remote parts of the supervising and therapeutic system) and the operator station (local part of the supervising and therapeutic system) is presented. Process stations are connected to the operator station via radio modems. It allows the installation in mobile facilities. Communication between stations is realized via wireless access points. The examples of the application of the presented issues in mobile systems, as well as the potentially locations of the security risks of transmission are given. The possible options for secure communications are described. The assumptions of the concept of a secure communication in the diagnostic system are explained.

Open access

Kazimierz Rembiasz, Marcin Bednarek, Piotr Budzyński, Marek Poźniczek and Andrzej Budzyński

Endoscopic-Ultrasound Guided Drainage of the Pancreatic Pseudocyst

The aim the study was the evaluation of the treatment results of the internal ultrasound and gastroscopy-guided pancreatic pseudocysts.

Material and methods. From 1994-2008 at the 2nd Department of General Surgery UJ CM there were 126 patients (incl. 45 female and 81 male) treated for pancreatic pseudocyst. Mean age of the women was 41.05 years (25-81) while men 48 years (19-79). Ultrasound and gastroscopy-guided drainage by the means of insertion of double pig tail drain was attempted in 46 patients (17 female and 29 male). Mean diameter of the cyst was 11.02 cm (from 2.5-20 cm).

Results. Out of 46 patients assigned to the internal ultrasound, gastroscopy guided drainage, the procedure was technically feasible in 39. Internal marsupialization was successful in 24 patients (52.17%). We did not observe serious complications mentioned in the literature incl. iatrogenic injuries of the intraabdominal organs or fistulas. Drain was removed after 5 month (1-9 month).

Conclusions. Endoscopic drainage consists an interesting minimally invasive approach in the management of pancreatic pseudocyst. More precise inclusion criteria could increase its efficacy.

Open access

Tomasz Wawer, Tadeusz Dąbrowski and Marcin Bednarek

Abstract

The following article describes diagnostic and reliability aspects of amateur radio communications. The intention of precise measuring of quality and accuracy of every contact was present in ham radio from very beginning. The reports were sent and they are still used today, in many variants. In time, the tools to measure ionosphere state and propagation conditions emerged. They are fundamental for communication, especially long distance ones. The article concentrates on description of digital amateur mode, JT9. This mode is very effective, enables worldwide reach and requires simple tools.

Open access

Marcin Bednarek, Tadeusz Dąbrowski and Tomasz Wawer

Abstract

Communication between the process stations of the distributed control system is carried out. By the supervision and therapeutic systems of the stations communication process diagnosis is performed. Supervision and therapeutic systems are responsible for the security of transmitted data. The security is considered in this article mainly in the aspect of resistance to external destructive factors on the data transmission process. It is assumed that the transmission security can be provided by mechanisms protecting the integrity of the transmitted data. Correctness of the data is controlled by using one-way hash function calculated on the basis of the transmitted value variable and also is attached to the transmitted data. This allows to maintain the integrity of the transmitted process data. A solutions using one-way hash function to protection of the transmission before changing message contents (caused by eg. intruder interference) are proposed in the article.

Open access

Magdalena Derewianka-Polak, Grzegorz Polak, Marcin Bobiński, Wiesława Bednarek, Jan Kotarski, Marta Makara-Studzińska, Aneta Gerhant and Marcin Olajossy

Abstract

The objective of the study was to assess the level of patients' need for information about the planned gynecologic surgery.

Material and Methods. The number of 173 patients preparing to undergo planned gynecological procedure were qualified for the study. The participation in the survey was entirely voluntary. Each patient was asked to fulfill the survey conducted using the Amsterdam Preoperative Anxiety and Information Scale- APAIS that enables the estimation of the patient’s need for surgery-related information. Furthermore patients’ clinical and demographic data was collected. Results were analyzed using appropriate statistical tools: the Shapiro-Wilk W-test (for distribution of the studied parameters) and the Mann-Whitney U-test (for comparing two independent groups). P value less than 0.05 was considered statistically significant.

Results. It was shown that premenopausal women have a greater need for information about the planned surgery than postmenopausal patients (p<0.05). Patients, who have never been operated, displayed a significantly greater need (p=0.04) for information about their planned surgery in relation to women who have already undergone surgery. The patient’s age, the phase of the menstrual cycle, the education level, the marital status, as well as the preoperative diagnosis and the type of the planned surgery did not affect the level of the preoperative information requirement (p>0.05).

Conclusions. The high level of the need for information about the planned surgery characterizes premenopausal patients and those operated for the first time.

Open access

Łukasz Mendyk, Marcin Świtoniak, Renata Bednarek and Adam Falkowski

Abstract

Construction and operation of water mills had influenced the transformation of the relief and water conditions, as well as the soil cover around them. The study area includes the former Oleszek mill pond basin, located near the Borówno village, western part of the Chełmińskie Lakeland, about 20 km northeast of Toruń. The objective of the study was to determine the genesis of the soils developed from the Oleszek mill pond basin sediments. Five soil profiles were selected in the basin of the former mill pond, within the 550 m transect located along the Struga Rychnowska river. All of the analysed soils developed from the sediments filling the former mill pond basin. They have been developed as a result of a number of overlapping processes such as mud-forming, alluvial, colluvial and gleyic process. According to the Polish classification system (Classification of Polish Soils 2011) (CPS) two of the soils (profiles 3 and 4) derived from organo-mineral and organic materials are typical organic limnic soils. Systematic position of another two soils (2 and 5) was proposed as muddy soils. Due to the problems of classification of such soils, implementation of the muddy soils or muddy-gleyic soils subtypes (in Polish: gleby mułowate lub mułowato-glejowe) should be considered during developing of the next update of Classification of Polish Soils. These four profiles were classified as Histosols (profiles 3 and 4) and Gleysols (profiles 2 and 5) in WRB (2014). Pedons developed from alluvial materials (alluvial soils in CPS 2011 or Fluvic Phaeozems in WRB 2014) occurred in the proximal part of the basin.

Open access

Marcin Dziedzic, Ewelina Orlowska, Kinga Gawel, Magdalena Zawadzka, Anna Bednarek-Skublewska and Janusz Solski

Abstract

The aim of the study was to assess plasma concentration of catecholamines and asymmetric dimethyl arginine levels and a possible relationship to predict the mortality rates among hemodialysis patients. The study population comprised 27 subjects, aged 65-70 years. Each patient underwent dialysis thrice a week. Furthermore, the median duration of hemodialysis was 3.5 years. Based on the conducted research, it can be concluded that the concentrations of adrenaline and the level of asymmetric dimethylarginine have predictive value of mortality among hemodialysis patients. Of note, lowering plasma asymmetric dimethylarginine concentration may represent therapeutic target for prevention of progressive renal damage.