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Open access

Anna Adamik and Michał Nowicki

Abstract

One of the biggest challenges that organizations are facing today is finding the proper way to shape competitive advantages in the age of Industry 4.0. This digital revolution forces companies to face specific challenges. The main purpose of this paper is to identify key requirements for the creation of a competitive advantage in the age of Industry 4.0 [CA. 4.0] The second purpose is to evaluate the level of organizations' preparedness for Digital Transformation [DX]. Studies based on a literature review describe requirements for organizations functioning in the age of Industry 4.0, especially in the area of DX and exploitation of Virtualization [V&DX].

Open access

Michał Nowicki, Maciej Kachniarz and Roman Szewczyk

Abstract

The paper presents a special measurement system for investigation of temperature influence on the indication of commercially available sensors of the magnetic field. Utilizing the developed system, several magnetoresistive and Hall-effect sensors were investigated within the temperature range from −30°C to 70°C. The obtained results indicate that sensitivity of most of the investigated sensors is unaffected, except the basic magnetoresistive device. However, Hall-effect sensors exhibit considerable temperature drift, regardless of the manufacturer.

Open access

Piotr Karwat, Ziemowit Klimonda, Michał Sęklewski, Marcin Lewandowski and Andrzej Nowicki

Abstract

Ultrasonic methods of human body internal structures imaging are being continuously enhanced. New algorithms are created to improve certain output parameters. A synthetic aperture method (SA) is an example which allows to display images at higher frame-rate than in case of conventional beam-forming method.

Higher computational complexity is a limitation of SA method and it can prevent from obtaining a desired reconstruction time. This problem can be solved by neglecting a part of data. Obviously it implies a decrease of imaging quality, however a proper data reduction technique would minimize the image degradation.

A proposed way of data reduction can be used with synthetic transmit aperture method (STA) and it bases on an assumption that a signal obtained from any pair of transducers is the same, no matter which transducer transmits and which receives. According to this postulate, nearly a half of the data can be ignored without image quality decrease.

The presented results of simulations and measurements with use of wire and tissue phantom prove that the proposed data reduction technique reduces the amount of data to be processed by half, while maintaining resolution and allowing only a small decrease of SNR and contrast of resulting images.

Open access

Mateusz Kamiński and Michał Nowicki

Abstract

Laparoscopic cholecystectomy is the golden standard, considering treatment of cholelithiasis. During the laparoscopic procedure one may often observe damage to the gall-bladder wall, as well as presence of gall-stones in the peritoneal cavity, as compared to classical surgery. These gall-stones may be associated with the occurrence of various complications following surgery. The study presented a rare case of a retroperitoneal abscess, as a consequence of retained gall-stones, in a female patient who was subject to laparoscopic cholecystectomy two years earlier.

Open access

Anna Adamik, Michał Nowicki and Katarzyna Szymańska

Abstract

Openness is an expression of an enterprise’s ability to adapt to changing environment conditions and its ability to cooperate with different types of partners. A given company’s openness shows its readiness for the creation of dynamics of many business processes, including the creation of its competitive advantage. Due to the nature of today’s enterprises’ environment, mainly its “high velocity” & “complexity” attributes, openness of companies has to be multifaceted. Organization-customer relationships, called co-creation, are one of such facets. The capacity for effective co-creation gives a company the ability to gain a competitive advantage along with the chance for its permanent dynamization and sustainability. The main purpose of the paper is to present the framework and algorithm of co-creation as a method of reducing the complexity of the environment and dynamizing companies’ competitive advantages. A review of literature in the areas of open organization, open culture, partnership, co-creation, and competitive advantage provides a basis for understanding the process of co-creation. Collected data show that the activity of enterprises in this process is a key factor in the reduction of complexity of a company’s environment and an important stimulator of the dynamization of a company’s competitive advantage. The authors’ own CATI questionnaire survey research conducted in Poland showed the level of preparation Polish SMEs have to co-create.

Open access

Adam Durczyński, Dariusz Szymański, Michał Nowicki, Piotr Hogendorf, Grażyna Poznańska and Janusz Strzelczyk

The aim of the study

Nowadays, increasing attention has been focused on relation between increased D-dimer levels and cancer among patients without detectable thrombosis.

was to measure plasma D-dimer levels in portal and peripheral blood in pancreatic cancer patients with absence of venous thromboembolism.

Material and methods. Fifteen consecutive patients hospitalized in the Department of General and Transplant Surgery of Medical University in Łódź, from January to March 2012 who underwent surgery due to a pancreatic cancer were enrolled. At laparotomy, portal and peripheral blood were sampled concurrently. D-dimer and fibrinogen levels were measured. Moreover, to investigate overall coagulation function prothrombin time (PT), prothrombin index (PI), international normalized ratio (INR), thrombin time (TT), activated partial thromboplastin time (APTT), TT and APTT index were evaluated.

Results. Peripheral plasma D-dimmer levels above normal range were found in 10/15 patients (66,67%), whereas D-dimer above normal values were confirmed in all portal blood samples. Mean D-dimer values were higher in portal than in peripheral blood (3279.37 vs 824.64, by 297%, p=0,025). These discrepancies were accompanied by normal limits of portal and peripheral levels of fibrinogen and comparable coagulation function indexes.

Conclusion. Our preliminary study showed the close relation between activation of hemostasis, reflected by elevated D-dimers in portal blood and presence of pancreatic cancer. These data suggest that measurement of portal blood D-dimer levels may be a potentially useful technique for screening the pancreatic cancer.

Open access

Adam Durczyński, Stanisław Sporny, Dariusz Szymański, Michał Nowicki, Piotr Hogendorf and Janusz Strzelczyk

Clinical Experience in Surgical Treatment of Gastrointestinal Neuroendocrine Tumors

Gastroenteropancreatic neuroendocrine tumors (GEP NET) represent heterogenous group of very rare neoplasms. Nevertheless, these tumors have been increasingly diagnosed recently. Authors present own experience with surgical treatment of gastrointestinal neuroendocrine tumors.

The aim of the study was to analyse retrospectively own material of patients with gastrointestinal neuroendocrine tumors treated surgically in the Department of General and Transplant Surgery of Medical University in Łódź.

Material and methods. The analysis included all patients with neuroendocrine tumors surgically treated from January 2007 to June 2009 in the Department of General and Transplant Surgery of Medical University in Łódź. The clinical patients data were obtained from medical histories, operative protocols and outcomes of final histopathological examinations. Analyzed data were as follows: age, gender, type and localization of tumor, clinical signs, results of preoperative tests and type of surgical procedure.

Results. Analysis revealed that 17 patients were operated on for gastrointestinal neuroendocrine tumors between years 2007-2009 in the Department of General and Transplant Surgery. Foregut tumors (5 gastric neuroendocrine tumors and 4 pancreatic insulinomas), midgut tumors (1 neuroendocrine cancer of ascending colon, 3 hepatic neuroendocrine cancers metastases, 2 primary hepatic neuroendocrine cancers, 1 gall bladder neuroendocrine cancer) and hindgut tumors (neuroendocrine cancer of rectum) were diagnosed in nine cases (53%), in seven cases (41%) and in one case (5%), respectively. Wide range of surgeries were performed in the Department, as follows: in 2 cases right hemihepatectomy, in 3 cases extended right hemihepatectomy, in 1 case left hemihepatectomy, in 4 cases pancreatic tumor enucleation, in 2 cases gastric resection, in 3 cases gastrectomy, in 1 case right hemicolectomy and in 1 case anterior resection of the rectum. The vast majority (11/17 patients; 64%) of tumors were poorly-differentiated neuroencorine carcinomas with high grade of histological malignancy. In one case coincidence of insulinoma and nesidioblastosis was confirmed. One patient suffered from signs of neuroglycopenia with loss of consciousness and convulsion preoperatively, incorrectly diagnosed as epilepsy.

Conclusions. Treatment of patients with gastrointestinal tumors is complex process and most commonly require close cooperation of various proffesional clinicians. Since asymptomatic course of disease and late stage of tumor advancement at diagnosis, technically difficult operations are often essential. Thus, surgeon who perform operations of patients with neuroendocrine tumors should be well experienced in carring out extensive surgical procedures.

Open access

Przemysław Łabęcki, Michał Nowicki and Piotr Skrzypczyński

Abstract

This article considers selected operational characteristics and measurement errors of the 2D laser scanner URG-04LX, which is a compact sensor suitable for walking robots. Quantitative errors in range measurement are evaluated considering the intensity output available from the sensor. The obtained intensity values help to correct the range measurements with regard to the optical characteristics of the observed surfaces. Moreover, mixed measurements are characterized and compared to the mixed measurements characteristics in the popular Sick LMS 200 laser scanner. Finally, it is shown how taking into account the error characteristics of the URG-04LX scanner improves its performance as the main exteroceptive sensor of a small walking robot.

Open access

Ruslan Sobolevskyi, Igor Korobiichuk, Michał Nowicki, Roman Szewczyk and Vladimir Shlapak

Abstract

The regularities of the changes of horizontal and sub-horizontal systems of cracks at different locations of Holovyne labradorite deposits are studied. The trend for stress to increase has been established in the quarry LLS “Optima” for Holovyne labradorite deposits in Volodar-Volynsk district, Zhytomyr region at the deepening of excavation. The duration of the working cycle of borehole drilling in a solid and cracked massif is calculated using a new method. The calendar planning method of mining is developed taking into account the dependence of drilling efficiency on horizontal and sub-horizontal systems of cracks.

Open access

Adam Nowicki, Michał Grochowski and Kazimierz Duzinkiewicz

Kernel Principal Component Analysis (KPCA), an example of machine learning, can be considered a non-linear extension of the PCA method. While various applications of KPCA are known, this paper explores the possibility to use it for building a data-driven model of a non-linear system-the water distribution system of the Chojnice town (Poland). This model is utilised for fault detection with the emphasis on water leakage detection. A systematic description of the system’s framework is followed by evaluation of its performance. Simulations prove that the presented approach is both flexible and efficient.