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A measuring system for supervision of the rail welding machine PRSM-4 no. 083
Anti? Boris,PejiDragan
Journal of Automatic Control , 2006, DOI: 10.2298/jac0601009a
Abstract: The paper describes a measuring system implemented on the rail welding machine PRSM-4 No. 083. The measuring system monitors and controls all parameters of rail welding procedure in real time. The paper gives an overview of the measurement of all relevant variables, control of the duration of individual welding phases and of the basic options of the command software. The paper describes the most important parts of the measuring block and presents the results of the system exploitation on over 10,000 completed welds on territories of Serbia, Montenegro and Bosnia and Herzegovina during a period of about two years.
Surgical treatment of gallbladder polypoid lesions
Peji? Miljko A.,Mili? Dragan J.
Srpski Arhiv za Celokupno Lekarstvo , 2003, DOI: 10.2298/sarh0308319p
Abstract: INTRODUCTION Polypoid lesions of the gallbladder can be divided into benign and malignant categories. Malignant polypoid lesions include carcinomas of the gallbladder, which is the fifth most common malignancy of the gastrointestinal tract and the most common malignancy of the biliary tract. Benign polypoid lesions of the gallbladder are divided into true tumors and pseudotumors. Pseudotumors account for most of polypoid lesions of the gallbladder, and include polyps, hyperplasia, and other miscellaneous lesions. Adenomas are the most common benign neoplasms of the gallbladder. Cholesterol polyps are the most common pseudotumors of the gallbladder. The polyps can be single or multiple, usually less than 10 mm in size. They have no predilection for any particular gallbladder site, and usually are attached to the gallbladder wall by a delicate, narrow pedicle. No malignant potential has been identified for this type of pseudotumor. Adenomas are the most common benign neoplasms of the gallbladder. They have no predilection site in the gallbladder, and may also be associated with gallstones or cholecystitis. The premalignant nature of adenomas remains controversial. Ultrasonography (US) has been demonstrated to be significantly better in detecting polypoid lesions of the gallbladder as compared with computed tomography and cholecystography. A mass fixed to the gallbladder wall of normal thickness, without shadowing, is seen in case of gallbladder polyp. Since gallbladder cancers usually present as polypoid lesions, differentiation between benign polypoid lesion and malignant lesion can be very difficult, even with high-resolution imaging techniques. PATIENTS AND METHODS Retrospectively we have analyzed 38 patients with ultrasonographicaly detected gallbladder polyps during the period from January 1995 to December 2000, who were treated at surgical department of Health Centre in Uzice and at Surgical clinic of Clinical Centre in Nis. We have analyzed patients demographical data as well as their symptoms and radiographic findings. If the patient was operated, patohistological findings were analyzed also. RESULTS In our study 38 examined patients had mean age of 53.2 years (standard deviation of 12.8 years; range 26-80 years). The male-female ratio was 1:1. Overall 36 patients had symptoms that could be related to gallbladder diseases. Among these patients, 32 had pain in the upper-right quadrant of the abdomen that could be defined as biliar colic, and two had symptoms of acute cholecystitis. Among remaining four patients, two were examined because of the pain
Tension-free procedures in the treatment of groin hernias
Mili? Dragan J.,Peji? Miljko A.
Srpski Arhiv za Celokupno Lekarstvo , 2003, DOI: 10.2298/sarh0302082m
Abstract: Hernia repair is one of the most common surgical procedures performed in the United States, with 700,000 operations performed each year. Improvements in surgical technique, together with the development of new prosthetic materials and a better understanding of how to use them, have significantly improved outcomes for many patients. These improvements have occurred most notably in centers specializing in hernia surgery, with some institutions reporting failure rates of less than 1%. In contrast, failure rates for general surgeons, who perform most hernia repairs, remain significantly higher. This has important socioeconomic implications, adding an estimated $28 billion or more to the cost of treating the condition, based on calculations utilizing conservative estimates of failure rates and the average cost of a hernia repair. Success of groin hernia repair is measured primarily by the permanence of the operation, fewest complications, minimal costs, and earliest return to normal activities. This success depends largely on the surgeon's understanding of the anatomy and physiology of the surgical area as well as a knowledge of how to use most effectively the currently available techniques and materials. The most important advance in hernia surgery has been the development of tension-free repairs. In 1958, Usher described a hernia repair using Marlex mesh. The benefit of that repair he described as being "tension-eliminating", or what we now call "tension-free". Usher opened the posterior wall and sutured a swatch of Marlex mesh to the undersurface of the medial margin of the defect and to the shelving edge of the inguinal ligament. He created tails from the mesh that encircled the spermatic cord and secured them to the inguinal ligament. Every type of tension-free repair requires a mesh, whether it is done through an open anterior, open posterior, or laparoscopic route. The most common prosthetic open repairs done today are the Lichtenstein onlay patch repair the PerFix plug and patch repair, the Prolene Hernia System bilayer patch repair and Trabucco’s sutureless preshaped hernioraphy. General surgeons today have access to a wider and more sophisticated range of synthetic biomaterials for use in hernia repair than ever before. The advantages and disadvantages of each of these devices must be understood however, before surgeons select any of these implants. Meanwhile, a 1997 study of various biomaterials used in abdominal wall hernia repair further reported that the risk of infection, seroma formation biomaterial-related intestinal obstructions, and other c
Geothermal heat exchanger with coaxial flow of fluids
PejiDragan M.,Stojiljkovi? Dragan T.,Stojiljkovi? Stani?a T.,?urovi?-Petrovi? Maja
Hemijska Industrija , 2005, DOI: 10.2298/hemind0510275p
Abstract: The paper deals with a heat exchanger with coaxial flow. Two coaxial pipes of the secondary part were placed directly into a geothermal boring in such a way that geothermal water flows around the outer pipe. Starting from the energy balance of the exchanger formed in this way and the assumption of a study-state operating regime, a mathematical model was formulated. On the basis of the model, the secondary circle output temperature was determined as a function of the exchanger geometry, the coefficient of heat passing through the heat exchange areas, the average mass isobaric specific heats of fluid and mass flows. The input temperature of the exchanger secondary circle and the temperature of the geothermal water at the exit of the boring were taken as known values. Also, an analysis of changes in certain factors influencing the secondary water temperature was carried out. The parameters (flow temperature) of the deep boring B-4 in Sijarinska Spa, Serbia were used. The theoretical results obtained indicate the great potential of this boring and the possible application of such an exchanger.
Systemic inflammatory response syndrome in surgical patients with sepsis
Mili? Dragan J.,Peji? Miljko A.,?ivi? Sa?a S.,Karanikoli? Aleksandar D.
Srpski Arhiv za Celokupno Lekarstvo , 2004, DOI: 10.2298/sarh0406182m
Abstract: Systemic inflammatory response syndrome and sepsis are common in surgically treated patients. Systemic inflammatory response syndrome represents a major factor of morbidity and mortality in these patients. The pathogenesis of these syndromes has been increasingly clarified. The objective of this review is to present an overview of our current understanding of the physiology underlying these conditions.
Coagulation disorders in the patients with deep vein thrombosis of lower extremity
Mili? Dragan J.,Peji? Miljko A.,Stojiljkovi? Danilo M.,Karanikoli? Aleksandar D.
Srpski Arhiv za Celokupno Lekarstvo , 2003, DOI: 10.2298/sarh0306201m
Abstract: PURPOSE Venous thromboembolism is a relevant social and health care problem for its high incidence, pulmonary embolism-related mortality and long-term sequelae which may be disabling (post-thrombotic syndrome and ulceration). PROCEDURES The aim of our work was to establish the presence of coagulation disorders (hypercoagulable states) in the patients with deep vein thrombosis (DVT) of the leg. Prospectively we have analyzed a group of 30 patients with echosono-graphicaly verified DVT of the leg who were admitted to the department of vascular surgery from August 1st 2000 to July 31st 2001.The following parameters were monitored: prothrombin time (PT) partial thromboplastin time (PTT), fibrinogen (Fib), alpha 2 antiplasmin (A-2 AP), D-dimer (DD), antithrombin III (AT III) and factor VII. FINDINGS Activation of the coagulation process was registered. The values of monitored coagulation parameters are shown in table 1. Plasma levels of monitored parameters in the patients with DVT of the leg were significantly higher than in the control subjects. CONCLUSION In patients with a DVT a hypercoagulable state is common finding. Some parameters of coagulation activity such as D-dimer might be of great interest in the diagnostic strategy of DVT.
Glutathione redox cycle in small intestinal mucosa and peripheral blood of pediatric celiac disease patients
Stojiljkovi?, Vesna?;Peji, Sne?Ana;Kasapovi?, Jelena;Gavrilovi?, Ljubica?;Stojiljkovi?, Stanimir?;Nikoli?, Dragan?;Pajovi?, Sne?Ana B.;
Anais da Academia Brasileira de Ciências , 2012, DOI: 10.1590/S0001-37652012000100018
Abstract: the celiac disease is an autoimmune gastrointestinal disorder caused by gluten from wheat, rye or barley. in genetically predisposed persons, gluten induces the immune-mediated inflammation of small intestinal mucosa. histological lesions include intraepithelial lymphocytosis, crypt hypertrophy and villous atrophy, resulting in malabsorption of micro- and macronutrients. the only treatment for celiac patients is a permanent gluten-free diet (gfd). reactive oxygen species (ros) and oxidative stress are strongly associated with the celiac disease. glutathione (gsh) is a main detoxifier of endogenous and exogenous ros in the intestine. in order to explain the role of glutathione redox cycle in celiac patients, we examined the activities of gsh-related antioxidant (ao) enzymes glutathione peroxidase (gpx) and glutathione reductase (gr), as well as the concentration of gsh in small intestinal biopsies and peripheral blood of children affected by the celiac disease. the concentration of lipid hydroperoxides (looh) as markers of oxidative damage was measured in the same samples. the results clearly demonstrate a significant malfunction of gsh redox cycle with a concomitant decrease in the capacity to regenerate gsh and detoxify looh in celiac patients, even after several years of gfd. the oral administration of gsh and a diet rich in natural antioxidants, as well as appropriate dietary supplements, could be of great benefit to the patients.
Spolia from the Church of St. Nicholas in Nikoljac
Peji? Svetlana
Zograf , 2012, DOI: 10.2298/zog1236013p
Abstract: Two, so far unknown, spolia with carved interlace ornaments, built into the wall of the Church of St. Nicholas in Nikoljac are analyzed. These spolia are a part of the collection of fragments discovered earlier in the Church of St. Peter in Bijelo Polje. A comparative analysis was performed on a multitude of pre-Romanic material, in order to determine the time when they were made and whether they originated from any specific circle of stonemasons, and also to identify the initial position of the fragments in the liturgical church furniture for which they had been carved. [Projekat Ministarstva nauke Republike Srbije, br. 177036]
Scheduling Jobs with a Common Due Date via Cooperative Game Theory  [PDF]
Irinel Dragan
American Journal of Operations Research (AJOR) , 2013, DOI: 10.4236/ajor.2013.35042
Abstract: Efficient values from Game Theory are used, in order to find out a fair allocation for a scheduling game associated with the problem of scheduling jobs with a common due date. A four person game illustrates the basic ideas and the computational difficulties.
On the Coalitional Rationality of the Shapley Value and Other Efficient Values of Cooperative TU Games  [PDF]
Irinel Dragan
American Journal of Operations Research (AJOR) , 2014, DOI: 10.4236/ajor.2014.44022
Abstract: In the theory of cooperative transferable utilities games, (TU games), the Efficient Values, that is those which show how the win of the grand coalition is shared by the players, may not be a good solution to give a fair outcome to each player. In an earlier work of the author, the Inverse Problem has been stated and explicitely solved for the Shapley Value and for the Least Square Values. In the present paper, for a given vector, which is the Shapley Value of a game, but it is not coalitional rational, that is it does not belong to the Core of the game, we would like to find out a new game with the Shapley Value equal to the a priori given vector and for which this vector is also in the Core of the game. In other words, in the Inverse Set relative to the Shapley Value, we want to find out a new game, for which the Shapley Value is coalitional rational. The results show how such a game may be obtained, and some examples are illustrating the technique. Moreover, it is shown that beside the original game, there are always other games for which the given vector is not in the Core. The similar problem is solved for the Least Square Values.
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