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  • Author: Krzysztof Kawecki x
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Judyta Felicjancik, Sebastian Kowalczyk, Karol Felicjancik and Krzysztof Kawecki


The paper presents the results of numerical simulations of ship propeller operation bearing the name of Propeller Open Water (POW) Tests. The object of tests was a sample ship propeller (PPTC1), the geometrical and kinematic data of which are available, along with the results of model tests, on the official page of the research centre involved in the measurements. The research aimed at verifying the correctness of results of numerical simulations performed in the model and real scale. The results of numerical analyses performed in the model scale were confronted with those measured in the experiment. Then, making use of dimensionless coefficients which characterise propeller’s operation, the recorded model data were extrapolated to real conditions and compared with corresponding results of simulations. Both the numerical simulations and the experimental research were performed for the same propeller load states. The reported research is in line with other activities which aim at developing advanced numerical methods to support the process of ship propeller designing.

Open access

Agnieszka Koźmin-Burzyńska, Agnieszka Bratek, Grzegorz Knefel, Krzysztof Krysta, Marek Kawecki and Irena Krupka-Matuszczyk


The aim of the study was to assess the level of anxiety and depressiveness in patients who had qualified for hyperbaric oxygen therapy (HBOT) for the treatment of ulcerative lesions in the lower limbs, occurring as a result of diabetic foot syndrome (DFS),. A total of 50 patients with type 2 diabetes and diabetic foot syndrome were enrolled to the study. All patients have received 30 sessions of HBOT. During the therapy blood glucose was measured and photographic documentation was carried out. All patients underwent the following procedures: medical history and socioeconomic interview, psychiatric examination, self-report and objective psychometric tests to measure anxiety and depressiveness. Based on the obtained results, we reported that patients with a greater degree of tissue damage had higher levels of depressive symptoms in the self-report tests as well as in the objective evaluation of the investigator. In terms of location of ulcerative lesions - the level of depressiveness was greater when the affected area included toes, and the level of anxiety was increased when it concerned the heel. Regarding other parameters, statistically significant correlations were not observed.

Open access

Wiesław Kruszewski, Wojciech Jasiński, Mariusz Szajewski, Jarosław Szefel, Krzysztof Kawecki, Maciej Ciesielski, Paweł Pikiel, Paweł Dilling and Cezary Warężak

Protective Stomy as a Complement to Anterior Rectal Resection. Analysis of Authors' Material and Literature Review

Anastomotic leak after anterior rectal resection for cancer is one of the most dangerous complications of the procedure. Protective stomy is a way to avoid life-threatening consequences of this complication. The procedure is still under evaluation.

The aim of the study was to evaluate the usefulness of forming a protective stomy as part of anterior rectal cancer resection on the basis of an analysis of the authors' material.

Material and methods. In 2008 - 2009, we treated 111 patients with rectal cancer. Thirty-two of those patients received preoperative radio(chemo)therapy. Eighty-four patients (76%) underwent resection of the primary tumour. In 20 patients (24%), we performed abdominoperineal or abdominosacral resection; in 6 (7%) cases the Hartmann procedure was used and in 58 (69%) cases anterior rectal resection was performed. In 53 of 58 cases, the resections were assessed as curative and in 5 as palliative. In 18 of 58 (31%) patients, anterior resections were defined as low anterior resections. Twelve (67%) of these patients were subjected to preoperative radio(chemo)therapy. Two of 58 patients, who underwent anterior resection, had been treated by stomy creation before the radical procedure. One of them required neoadjuvant radiotherapy. In the second patient with the stomy, we restored the intestinal continuity during the primary tumour resection. Among the remaining 40 patients, only one underwent protective stomy creation during the resective procedure. This patient did not require preoperative radiotherapy.

Results. We have not found any clinical indications of anastomotic leak in the analysed group of 58 patients subjected to anterior rectal resection for cancer.

Conclusions. Our modest experience reaffirms our conviction that anterior rectal cancer resection does not require routine protective stomy creation, also when low anterior resection follows preoperative radiotherapy.

Open access

Andrzej Romanowski, Robert Nowotniak, Kacper Kawecki, Tomasz Jaworski, Zbigniew Chaniecki and Krzysztof Grudzień


This paper contain study of three algorithms for optimisation of use of materials for cutting process. Cutting Stock Problem (CSP) and one dimensional guillotine cat variant of the CSP is introduced. Afterwards three different way of solving the problem are presented. For each of theme one algorithm is proposed. First is creating all the possible solutions and choosing the best one. Second is trying to recreate a human thinking process by using a heuristic search. Third one is inspired by an evolution process in the nature. Design and implementation of each of them is presented. Proposed algorithms are tested and compared to each other and also to the other known solutions.