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Valentin Oleksik,Adrian Pascu,Cristian Deac,Radu Fleaca,Mihai Roman,Octavian Bologa 한국소성가공학회 2010 기타자료 Vol.2010 No.6
In this paper the authors intend to examine by numerical simulation one of the newest methods for obtaining the knee condylar surface, namely by incremental forming starting from a commercially pure titanium (CP Ti) sheet. In order to study the influence of the geometrical parameters, the authors chose to vary the material thickness, the punch diameter and the vertical step of the punch. Two different values of the hemispherical punch diameter (d = 4 and 6 mm), two different initial thicknesses of the blank (t = 1 and 1.2 mm) and two different vertical step values (s = 0.6 and 1 mm) are taken into consideration. The numerical results of the simulations were centered on determining the thinning of the sheet, the major principal strain, the springback, the process forces and the manner in which these are influenced by the geometrical parameters that were varied.
Poster Session:PS 0573 ; Oncology : Cardiac Lymphoma: Case Report
( Valentin Kokorin ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Patient, 34 y.o. male, was admitted with complaints of fever (up to 39°C for 1 month) and dyspnea at night time. On ECG ST-segment elevation in inferior leads and ST-segment depression in V1-V3 was revealed. The patient was hospitalized to the intensive care unit with suspected STEMI. Condition at admission was moderate. HR 85/min, rhythm regular, BP 110/70 mm Hg. On echo: LV hypertrophy (2 cm), hypokinesis of inferior LV wall, ejection fraction 30% and pericardial effusion (0,8-2 cm). In lab tests: Hb 114 g/l, platelets 151x109/l, WBC 2.3x109/l, CK-MB 41 U/l, troponin T 321 ng/l, CRP 17 mg/l. On the next day the level of troponin T was 800 ng/l, D-dimer 705 ng/ml. On coronary angiography no abnormalities revealed. Differential diagnosis between myocardial infarction, pulmonary embolism, miocarditis and sepsis was performed. Patient was treated with anticoagulants, antiaggregants, ß-blockers, ACE inhibitors, statins, diuretics, antibiotics and anti-infi ammatory drugs. In serologic test mild elevation of IgM antibodies to Chlamidia trachomatis and cytomegalovirus was revealed. Blood culture and procalcitonin test was negative. On echo low LV EF and moderate pericardial effusion remained. In a week after admission the level of Hb was 94 g/l, creatinine 260 mcmol/l, hypoalbuminemia 28 g/l, CRP 212 mg/l, BNP 24809 pg/ml. Despite ongoing treatment patients` status progressively worsened, hyperthermia remained, dyspnea at rest, arterial hypotension, oliguria and fi nally cardiogenic shock developed. The patient died on day 12 after admission. On autopsy heart weight 480 g, on epicardium and endocardium grained whitish spots on a dark Background: Myocardium with multiple well-demarcated areas of whitish color. Microscopy: lymphocytic infi ltration and necrosis areas. Similar lesions in anterior mediastinum, thyroid gland, small intestine. final diagnosis: diffuse B-cell lymphoma with extranodal dominantly cardiac lesions. This case demonstrates diversity clinical picture of cardiac lymphoma and complexity of its diagnosis and treatment.
Valentin N. Sapunov,Antonina A. Stepacheva,Esther M. Sulman,Johan Wärnåc,Päivi Mäki-Arvela,Mikhail G. Sulman,Alexander I. Sidorov,Barry D. Stein,Dmitry Yu. Murzin,Valentina G. Matveeva 한국공업화학회 2017 Journal of Industrial and Engineering Chemistry Vol.46 No.-
Stearic acid hydrodeoxygenation into n-heptadecane on the catalyst containing Pd nanoparticlesincorporated in the hypercrosslinked polystyrene matrix was studied. The used catalysts werecharacterized using TEM, CO chemisorption, low-temperature nitrogen physisorption and XPS. A clearhydrogen pressure dependent induction period was noticed. Kinetic regularities were studied for theindicated reaction in the presence of polymer based catalysts. A mathematical model for decarboxylationwas suggested which was able to adequately describe experimental data at different temperatures,hydrogen pressures and initial concentrations of stearic acid. Kinetic constants were calculated and theirstatistical analysis was performed.
Valentin Yakovlevich Afanasyev,Vladimir Fyodorovich Ukolov,Ekaterina Alexandrovna Tregubova 대한산업공학회 2021 Industrial Engineeering & Management Systems Vol.20 No.4
In recent years, supply chain management with the aim of making the supply chain more efficient and reducing over-all costs, is one of the key issues addressed in every industry. In today's energy supply chain, determining the level of sales for manufactured goods in specific time periods and to specific customer groups is very important. This becomes even more important when we have to do this for sensitive marine products that have different customer categories. This article presents a model for determining the optimal level of sales of thermal energy in two levels and according to customer demand in different time periods to determine the optimal level of sales using accurate methods and some meta-innovative methods. For this purpose, two meta-heuristic methods of particle swarm optimization (PSO) and the evolutionary algorithm CPSO have been used.
Black-Box Accuracy Compensation for a Cable-Driven Parallel Robot
Valentin Schmidt,Werner Kraus,Christoph Martin,Xuejun Jin,Andreas Pott 제어로봇시스템학회 2017 제어로봇시스템학회 국제학술대회 논문집 Vol.2017 No.10
This paper presents the findings of experiments done to increase the accuracy of a fully constrained cabledriven parallel robot with 8 cables and 6 degrees of freedom. Measurements were conducted using a Laser Tracker in 3 dof and the position accuracy mapped. Measurements were performed in a grid with 1920 points. From the measurement data distortion to the actual desired position is measured and using a linear approximation subsequent trajectories are compensated for any systematic errors. On an example robot, this black box correction brought an average improvement from 10.6 mm distance to the desired point to 2.47 mm distance from the desired point. This is a significant improvement m accuracy.
Modelling of Iron Losses in Salient Pole Permanent Magnet Synchronous Motors
Valentin NAVRAPESCU,Dragos Ovidiu KISCK,George ANDRONESCU,Mircea POPESCU,Mariana KISCK 전력전자학회 2007 ICPE(ISPE)논문집 Vol.- No.-
Today, for the same rated power and speed electrical drives we have a strong competitor to the induction motors. This one it is represented by permanent magnet synchronous motors (PMSM) with salient pole rotors. In this paper are presented dedicated analytical and numerical models for the iron loss effect over the motor performance. It is presented a comprehensive comparison between no-load and loaded conditions test data for all the models presented.
Valentin Yakovlevich Afanasyev,Vladimir Fedorovich Ukolov,Vitaly Vasilievich Kuzmin 대한산업공학회 2021 Industrial Engineeering & Management Systems Vol.20 No.4
Energy is one of the most important pillars in any production system. Recent studies show that with increasing energy consumption in manufacturing industries, energy efficiency is one of the most important challenges in factories. On the other hand, reducing energy consumption may increase delays in the delivery of production orders. For this rea-son, in this paper, a new mathematical model is presented to optimize the workshop flow with the aim of reducing energy consumption, reducing completion time and reducing latency. In this mathematical model, the limitations of using machines and determining the speed level for each machine are considered. In order to validate the mathemati-cal model, a numerical problem is designed and the results of its optimization are examined and analyzed. Also, the relationship between energy consumption, completion time and delay time has been studied and analyzed, as well as the effect of machine speed on each of the objectives of the mathematical model.
Valentine R. Esposito,Brian L. Dial,Robert D. Fitch,Robert K. Lark 대한척추외과학회 2019 Asian Spine Journal Vol.13 No.6
Study Design: Retrospective study. Purpose: The objective of this study was to compare percent correction between apical and periapical pedicle screw (PS) and sublaminar wire constructs for Cobb correction and coronal balance correction. Overview of Literature: The current gold standard for deformity correction in adolescent idiopathic scoliosis (AIS) are PS constructs. Sublaminar wires provide an alternative means of fixation when PS fixation cannot be safely performed. Two previous studies have compared percent curve correction between sublaminar wires and PSs, with conflicting conclusions. Methods: The study was a retrospective review of Lenke type 1 curves with minimum follow-up of at least 1 year. Cases were divided into two groups: constructs using apical/periapical sublaminar wires (SL group) versus PS only constructs (PS group). Percent Cobb correction and coronal balance were compared between the two groups at 1 year. A multivariable regression model was used to determine the impact of apical/periapical wires on percent Cobb correction and coronal balance at 1 year when accounting for additional variables. Results: The cohort included 71 patients who were predominantly female (80.2%), with average age of 14.2 years. Only 21 (29.5%) of constructs utilized apical/periapical sublaminar wires. There was a significant difference in percent Cobb correction at 1 year for the PS and SL groups (70.26% vs. 60.09%, p=0.05). No difference was observed in overall coronal balance. A multivariable model revealed that apical/periapical wires were negatively associated with percent Cobb correction at 1 year (coefficient=−8.49, p=0.023), while total implant density of the construct was positively associated with correction (coefficient=24.2, p<0.001). Conclusions: Use of PSs in the apical and periapical zones resulted in improved percent Cobb correction at 1 year in patients with AIS Lenke type 1 curves. Sublaminar wires remain a useful surgical option and result in equivalent coronal balance compared to PSs.