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1
Content available Automatic segmentation of brain tumors using tensor analysis and multimodal MRI
Jackowski K., Manhães-Savio A., Cyganek B.
Journal of Medical Informatics & Technologies
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2015
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Vol. 24
165--172
EN
Glioma detection and classification is an critical step to diagnose and select the correct treatment for the brain tumours. There has been advances in glioma research and Magnetic Resonance Imaging (MRI) is the most accurate non-invasive medical tool to localize and analyse brain cancer.The scientific global community has been organizing challenges of open data analysis to push forward automatic algorithms to tackle this task. In this paper we analyse part of such challenge data, the Multimodal Brain Tumor Image Segmentation Benchmark (BRATS), with novel algorithms using partial learning to test an active learning methodology and tensor-based image modelling methods to deal with the fusion of the multimodal MRI data into one space. A Random Forest classifier is used for pixel classification. Our results show an error rates of 0.011 up to 0.057 for intra-subject classification. These results are promising compared to other studies. We plan to extend this method to use more than 3 MRI modalities and present a full active learning approach.
2
Content available remote Chosen Economical Aspects of Vessel’s Operational Speed
Jackowski K.
Zeszyty Naukowe Akademii Morskiej w Gdyni
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2012
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nr 74
15--22
EN
Determination of ship’s operational speed for various conditions of a voyage is dealt with in this paper. Major economical criteria of speed optimization are considered and analysed, as well as their modification due to occurence of speed limitation in a seaway. Examplary calculations of economically justifiable operational speed are given and graphs of costs and profits, as the functions of speed, are presented. The last paragraph of the paper contains a few practical remarks about dependance of optimal solutions on some external factors.
3
Content available An improved medical diagnosing of acute abdominal pain with decision tree
Jankowski D., Jackowski K.
Journal of Medical Informatics & Technologies
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2012
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Vol. 20
65--71
EN
In medical decision making (e.g., classification) we expect that decision will be made effectively and reliably. Decision making systems with their ability to learn automatically seem to be very appropriate for performing such tasks. Decision trees provide high classification accuracy with simple representation of gathered knowledge. Those advantages cause that decision trees have been widely used in different areas of medical decision making. In this paper we present characteristic of univariate and multivariate decision tree. We apply those classifiers to the problem of acute abdominal pain diagnosis.
4
Content available remote Manewr awaryjnego zatrzymania statku na torze wodnym
Jackowski K.
Zeszyty Naukowe Akademii Morskiej w Gdyni
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2011
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nr 69
45-50
PL
Artykuł dotyczy manewru awaryjnego zatrzymania dużego statku na torze wodnym. Przyjęto, że tor wodny został zablokowany przez inny duży statek. Należy więc doprowadzić do zatrzymania poruszającego się statku lub przynajmniej maksymalnie zredukować jego prędkość, tak aby skutki ewentualnej kolizji były minimalne – nie wolno jednak dopuścić do wyjścia poza tor, ponieważ zagraża to znacznie poważniejszymi konsekwencjami. Rozpatrywane są dwa warianty manewru: wariant bezpośredniego przesterowania napędu na całą wstecz oraz wariant rozpoczęcia manewru zatrzymania od wyłożenia steru na burtę. Uwzględniono także ewentualne procedury korekcyjne, które mogą okazać się konieczne w trakcie wykonywania manewru awaryjnego zatrzymania statku. Na koniec oceniono przebieg manewru i podano wynikające stąd wnioski.
EN
The paper deals with the problem of emergency stopping of a large vessel in a fairway, which has been blocked by another big ship. It is assumed that the proceeding vessel must be stopped, or at least its speed must be reduced to such extent that an effect of a collision with an obstructing ship will not be destructive – the stopping vessel, however, must not leave the fairway, as consequences of this may be very serious. There are considered two variants of emergency stopping manoeuvre: to reverse immediately engine to full astern or begin the manoeuvre by putting rudder hard-a-port or hard-to--starboard. Some indispensable corrective procedures while carrying on the emergency manouvre are also taken into account. In the last paragraph accomplishment of the manoeuvre is evaluated and some inferences are given.
5
Content available Integrated system merging the knowledge of different medical and technological disciplines WROVASC project
Burduk R., Jackowski K., Wozniak M.
Journal of Medical Informatics & Technologies
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2010
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Vol. 14
23--29
EN
The paper presents selected aims of WROVASK project carried on by Regional Specialist Hospital in Wroclaw with cooperation with a number of academic and research centres. The project is of interdisciplinary kind and gathers researchers and experts of number different disciplines, like chemistry, agricultural, and technical sciences, especially mechanics and informatics. Some tasks aiming at development information systems are presented and described such as: data warehouse based reporting system for the hospital, the system supporting assignment management in teleradiology with optimization of its distribution, and intelligent decision support system for automated assessment of washing surgical tools quality.
6
Content available Applying Graph Theory Terms to Description of VTS
Jackowski K.
TransNav : International Journal on Marine Navigation and Safety of Sea Transportation
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2009
|
Vol. 3, no. 1
55--58
EN
The paper presents an example of applying graph theory notation to description of a VTS; it also contains some remarks on applicability of such notation for marine traffic systems.
7
An Experimental Test for the Approximation of NMR Solvent Effects by Continuum Models. 19F Gas-to-Solution Shifts of SF6 and CF4
Jackowski K., Wilczek M.
Polish Journal of Chemistry
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2006
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Vol. 80, nr 7
1169-1175
EN
19F gas-to-solution shifts were measured for two solute molecules (SF6, CF4) and 39 organic solvents. A correlation between the results for SF6 and CF4 is satisfactory and proves that solvent effects of both the solute molecules can be described in the same way. The present 19F shifts of SF6 are also compared with some previous gas-to-solution shifts observed for 129Xe gas and 33S in SF6. It is shown that intermolecular interactions change the shifts of external atoms (19F and 129Xe) in slightly different way than it is observed for the central atom of 33S in a SF6 molecule.
8
Influence of Intermolecular Interactions on Nuclear Magnetic Shielding Constans of OCS
Jackowski K., Les A., Makulski W., Wozniak K.
Polish Journal of Chemistry
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2002
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Vol. 76 / nr 4
575-580
EN
The gauge-included atomic orbital (GIAO) method has been applied within the coupled Hartree-Fock (CHF) approximation to compute 13C, 17Oand 33SNMRchemical shifts for solid OCS. Increasing clusters of OCS molecules taken out of crystal lattice have been used in an additive approximation to estimate the effect of intermolecular interactions on shielding of the carbon, oxygen and sulphur nuclei. There is a very good agreement achieved for NMR chemical shifts between the results of calculations and experimental measurements obtained for 13C and also some discrepancies for 17Oand 33S nuclei, probably due to deficiency of ab-initio calculations (lack of electron correlation). The results reveal that the 33S NMR signal of OCS is strongly dependent on intermolecular interactions.
9
Content available A formal description of navigational process
Jackowski K.
Annual of Navigation
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2001
|
No. 3
41-74
EN
In this paper there is undertaken an attempt to present the formal description of the ship’s navigation process. This formal description takes into account not only all the most important ship’s characteristics that influence the ship’s motion but also all the most important environmental characteristics influencing the ship’s behaviour at sea. The formal description comprises the following issues: ship’s navigation process, navigational information, dynamic of the ship’s motion, equations describing the ship’s navigation process, and mathematical models of ship’s navigation process.
10
Solvent-Dependent Deuterium Isotope Effects in the 15N NMR Spectra of an Ammonium Ion
Wielogórska E., Jackowski K.
Polish Journal of Chemistry
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2000
|
Vol. 74, nr 4
567-572
EN
The reduced coupling constants have been estimated to present isotope effects in the spin-spin coupling constants. The latter isotope effects are fairly small.
11
Effects of intermolecular interactions on the 1H, 13C and 14N NMR chemical shifts of N,N-Dimethylformamide dissolved in monosubstituted benzenes
Jackowski K., Makulski W., Trenkner-Olejniczak Z.
Bulletin of the Polish Academy of Sciences. Chemistry
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2000
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Vol. 48, No. 1
81-89
EN
1 H,13 C and 14 N NMR chemical shifts have been used to monitor the dilution process of JV,7V-dimethylformamide (DMF) in monosubstituted benzenes. Both the proton and carbon chemical shifts of non-equivalent methyl groups in DMF are spectacularly influenced by ASIS (Aromatic Solvent Induced Shift) effects at the low concentration of a solute. On the other hand, the destruction of DMF liquid structure itself is better seen when the 13C chemical shift of a carbonyl carbon and the 14N shift are verified. A good correlation between the latter NMR chemical shifts has been found. It is shown on the basis of GIAO-CHF model calculations that the destruction of solute dipole-dipole dimers may be responsible for the increase of carbonyl carbon and nitrogen shielding constants of DMF in solvents.
12
Effect of planar substituents on magnetic shielding tensors of sp-hybridized carbon nuclei in substitueted acetylenes - a GIAO-CHF study
Jackowski K., Molchanov S., Gryff-Keller A.
Bulletin of the Polish Academy of Sciences. Chemistry
|
2000
|
Vol. 48, No. 1
77-80
EN
The magnetic shielding tensors for sp-hybridized carbons in a series of acetyl-enic compounds XC=CH (X = H, NH2, OMe, NMe2) Ph, CHO, CC1O and NO2) have been calculated using the GIAO-CHF method and the standard 6-31G** basis set. The substituent effect has appeared to be large but independent of the 7r-electronic properties of the substituent.
13
Magnetic shielding tensors of sp-hybridized carbons in butadinyltrimethylsilane. 13C nuclear spin relaxation and ab initio study
Ejchart A., Jackowski K., Gryff-Keller A.
Bulletin of the Polish Academy of Sciences. Chemistry
|
1999
|
Vol. 47, No. 1
77-81
EN
Principal values of magnetic shielding tensors of acetylenic carbon nuclei for butadiynyltrimethylsilane and its reorientation rate in solution have been obtained from the interpretation of the 13C longitudinal relaxation data. The ab initio GIAO-CHF calculations of shielding parameters have been performed and the experimental and theoretical results have been compared.
14
Oszczędność energii oraz wzrost niezawodności działania obiegów wodnych w ciepłowniach komunalnych
Jackowski K., Jędral W., Zwierzchowski R.
Prace Naukowe Politechniki Warszawskiej. Uczelniane Centrum Badawcze Energetyki i Ochrony Środowiska
|
1998
|
z. 2
143-158
PL
W artykule przedstawiono wyniki badań nad sposobami obniżenia zużycia energii oraz poprawienia niezawodności działania obiegów wodnych w ciepłowniach komunalnych. Efekty te są możliwe do osiągnięcia, jeśli zastosowane będą zaproponowane przez autorów nowe sposoby regulacji strumieni wody i ciśnienia w układach pomp obiegowych i pomp zmieszania gorącego oraz wprowadzone zostanie zmieszanie zimne pompowe w miejsce regulacji dławieniowej.
EN
In this paper the results of investigations for improvement of the heating-water pumping station for the communal heating plants and for decreasing of energy consumption are presented. Application of new, proposed by the authors, methods of water flow rate and pressure control for circulation and hot mixing pumps and introducing of pumps for cold mixing instead of throttling control allow to obtain economical effects due to energy savings.
15
GIAO-CHF and experimental study of the substituent effect on (13)C magnetic shielding in benzene derivatives
Jackowski K., Leś A., Dąmbska A., Adamowicz L.
Polish Journal of Chemistry
|
1998
|
Vol. 72, nr 7S
1624-1629
EN
Ab initio calculations of the (13)C shielding constants were performed with the use of the GIAO-CHF method for the benzene molecule and its 14 monosubstituted derivatives. The theoretical substituent effects were compared with our experimental data which were measured in cyclohexane solutions and extrapolated to infinite dilution. Satisfactory correlations between theoretical and experimental results were observed for all the aromatic carbons except those in the metal position.
16
Effects of molecular association on the NMR shielding constants in methylamine
Jackowski K., Leś A., Bernatowicz P.
Polish Journal of Chemistry
|
1998
|
Vol. 72, nr 3
527-533
EN
The (15)N, (13)C and (1)H NMR chemical shifts were measured for methylamine in the gaseous and liquid phase. The gas to liquid shifts revel the deshielding effects for all investigated nuclei. It is shown that the hydrogen bonding is responsible for the largest changes, which are observed for the nitrogen and amino hydrogen atoms as well. The CHF-GIAO calculations indicate that the cyclic trimer of methylamine exhibits the shielding changes, which are in quantitative agreement with the gas to liquid shifts.
17
Intermolecular effects in GIAO-CHF calculations of NMR chemical shifts
Jackowski K.
Bulletin of the Polish Academy of Sciences. Chemistry
|
1998
|
Vol. 46, No. 1
91-103
EN
Gauge-invariant atomic orbital (GIAO) calculations are applied for the in- vestigation of intermolecular interactions. Some modest examples show that the (GIAO) method allows for the useful estimation of NMR gas to liquid shifts and nuclear shielding tensors for molecules in the solid state. All the theoretical results can be easily verified by the NMR measurements.
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