Application of the partitioning method to specific Toeplitz matrices

We propose an adaptation of the partitioning method for determination of theMoore–Penrose inverse of a matrix augmented by a block-column matrix. A simplified implementation of the partitioning method on specific Toeplitz matrices is obtained. The idea for observing this type of Toeplitz matrices lies in the fact that they appear in the linear motion blur models in which blurring matrices (representing the convolution kernels) are known in advance. The advantage of the introduced method is a significant reduction in the computational time required to calculate the Moore–Penrose inverse of specific Toeplitz matrices of an arbitrary size. The method is implemented in MATLAB, and illustrative examples are presented

Application of the pseudoinverse computation in reconstruction of blurred images

We present a direct method for removing uniform linear motion blur from images. The method is based on a straightforward construction of the Moore-Penrose inverse of the blurring matrix for a given mathematical model. The computational load of the method is decreased significantly with respect to other competitive methods, while the resolution of the restored images remains at a very high level. The method is implemented in the programming package MATLAB and respective numerical examples are presented

Application of the partitioning method to specific Toeplitz matrices

We propose an adaptation of the partitioning method for determination of theMoore–Penrose inverse of a matrix augmented by a block-column matrix. A simplified implementation of the partitioning method on specific Toeplitz matrices is obtained. The idea for observing this type of Toeplitz matrices lies in the fact that they appear in the linear motion blur models in which blurring matrices (representing the convolution kernels) are known in advance. The advantage of the introduced method is a significant reduction in the computational time required to calculate the Moore–Penrose inverse of specific Toeplitz matrices of an arbitrary size. The method is implemented in MATLAB, and illustrative examples are presented

EXTRACORPOREAL SHOCK WAVE LITHOTRIPSY IN TREATMENT OF PEDIATRIC UROLITHIASIS

The paper presents the experiences in the treatment of urinary tract calculosis in 114 children aged 6 months to 14 years by means of extracorporeal shock wave lithotripsy (ESWL).The treatment was performed at the Institute of Radiology and the Clinic for Pediatric Surgery and Orthopedics in Nis, in the period 1988-2000 on Siemens Litostar lithotriptor. The children were treated after clinical, laboratory and radiological preparation, provided that the stone was not greater than 3 cm (measured in native urinary tract graph) and that it was not located in the pelvic part of the ureter. In the present study, the success in application of ESWL for treating pediatric patients was 88%. The total clearance of fragments was found in 57% of patients, whereas retention of fragments smaller than 4 mm three months after the last treatment was present in 31% of patients. ESWL treatment failed in 12% of patients since they had retained fragments greater than 4 mm.The authors recommend this method as a method of choice in the treatment of renal and urethral calculi in children

ANTENATAL DOUBT AND POSTNATAL DIAGNOSIS OF URINARY ANOMALY

Urinary tract and renal abnormalities represent 20% of all congenital malformations.Prenatal fetal ultrasonography revealed data of echostructure of renal parenchyma, dilatation of urinary sistem and visualisation of the fetal bladder after 16 weeks of gestation.Pyelic dilatation is considered when the anteroposterior diameter exceeds 4 mm before and 7 mm after 33 th week of gestation.All the children with antenatal doubt of urinary malformation should be examined. In the last 2 years we examined 25 newborns with antenatal doubt about urinary abnormalities. Multicystic dysplastic kidney was identified in 20%, posterior urethral valves in 12%, ureterocela in 8%, vesicoureteric junction anomaly in 24%, and high grade VUR in 32%. In the secound group of newborns, which was at the same time controlled due to the postnatally revealed hydronephrosis, our annual follow-up showed that there was spontaneous reduction of changes in 50% of cases, while in 25% of cases we revealed the reflux and vesicouretheric junction anomaly in 25%.Prenatally diagnosed hydronephrosis is more severe than hydronephrosis of the same degree revealed postnatally. Hydronephrosis in the first postnatal days in sterile urine conditions has spontaneous regression in one third of examined children

ULTRASOUND EXAMINATION OF THE RENAL CORTEX IN THE HEALTHY NEW-BORN

The examination of the kidney parenchyma by the ultrasound assumes the identification of the cortex, of the medulla and of the arciform blood vessels. The kidney cortey is normally less echogenic than the parenchyma of the spleen and the liver; in the normal new-borns and babies it can also be isoechogenic with the liver parenchyma while in the prematures and in the new-borns with a small delivery mass it can be even more echogenic than the liver parenchyma. In the parenchymic diseases of the children kidneys the cortex becomes more echogenic than the liverparenchyma or it can be isoechogenic with it. The aim of the paper is to examine the kidney cortex isogenic nature in healthy new-borns of different age and body mass. The examination comprised 49 healthy new-borns with the normal urine findings as well as the normal nitrogen products in the serum of the age from 1 to 27 days with the body mass from 1900 to 4950 g. The real time ultrasound technique was used as adopted to the new-born age. It was found out that the kidney cortex of the majority of the healthy new-borns - born on time with a small delivery mass - as well as that of the prematures was isoechogenic with the liver parenchyma or more echogenic than it. In the new-born with a delivery mass of over 3000 g and especially of over 4000 g the kidney cortexwas most often more hypo-echogenic than the liver parenchym

Flood impact on soil properties and the local community: Study area of the Kolubara river flood zone

Floods cause soil degradation, leading to a reduction in agricultural production, which interacts with the socio-cultural, economic and natural environment. The frequency of flood events may be due to synergistic actions of all factors both natural and anthropogenic. Local community in the river Kolubara catchment was exposed to the catastrophic flood in May 2014. and suffered a lot of damage. This paper analyzes the consequences of these floods in the flood zone of the Kolubara River as well as their impact on soil properties. Since the local community in study area depends primarily on agriculture, the impact of flood from socio-economic aspect was analyzed using the SWOT (Strengths, Weaknesses, Opportunities, Threats) method. [Projekat Ministarstva nauke Republike Srbije, br. 43007: Studying climate change and its influence on the environment: impacts, adaptation and mitigation

ULTRASOUND-EXPLORED ANATOMIC CHARACTERISTICS OF THE RENAL SINUS IN HEALTHY CHILDREN

In 195 with no manifest urinary tract disease, of the one to seven years of age,the ultrasound was used to determine the renal sinus dimensions (length and width),Their correlation with age and the kidnev dimensions was examined. The real-timemechanical sector scanner (ALOKA SSD 500) was used with convex probes of 3,5and 5 MHz in the supine position and in the counter-lateral body decubitus. The sinus dimensions kept on increasing continuously during the analysis period, mostintensely during the fifth year of age. The sinus enlargement was in a bettercorrelation with the kidney growth than with the childrens age. Still, there is anevident slight lagging behind in the sinus dimension growth comparing to the kidneydimension growth

ULTRASOUND-DETERMINED DIMENSIONS OF THE RENAL PARENCHYMA ULTRASOUND IN HEALTHY CHILDREN

In 195 with no manifest urinary tract disease, of me one to seven years of age,the ultrasound was used to determine the renal parenchvma (thickness at the genderinter-gender levels); their correlation with age the kidney dimensions was examined.The dynamic ratio between the parenchyma dimensions and those of the kidney wasanalyzed. The real-time mechanical sector scanner (ALOKA SSD 500) was used with convex probes of 3,5 and 5 MHz in the supine position and in the counter-lateralbody decubitus. The parenchyma dimensions kept on increasing continuously duringthe analyzed period, most intensely in the second and fifth years of age. Theparenchyma enlargement was in a better con-elation with the kidney growth than withthe childrens age. Still, there is an evident slight enlargement of the parenchymadimensions than that of the kidney dimensions