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Papers by Marinescu Adrian

Research paper thumbnail of Large gyromagnetic effect in soft magnetic amorphous ribbons and wires

Journal of Magnetism and Magnetic Materials, 2000

We report results on the Einstein–de Haas rotation of Fe77.5Si7.5B15 amorphous ribbons and wires,... more We report results on the Einstein–de Haas rotation of Fe77.5Si7.5B15 amorphous ribbons and wires, a phenomenon called large gyromagnetic effect. The laws of this effect are firstly inferred from the experimental data, and then a comprehensive model that explains these laws is presented.

Research paper thumbnail of Magneto-Impedance Effect in Amorphous and Nanocrystalline Glass-Covered Wires

Journal of The Magnetics Society of Japan, 1999

The magnetoimpedance effect in several Co-rich amorphous ribbons is overviewed. Results are class... more The magnetoimpedance effect in several Co-rich amorphous ribbons is overviewed. Results are classified in the following sections: influence of anisotropies induced by stress annealing, dependence on applied stress, its dependence on stress or stress-impedance, and the appearance of hysteresis. The influence of nanocrystallization of given Fe-rich ribbons is also analyzed.

Research paper thumbnail of Initial Clinical Trial of a Closed Loop, Fully Automatic Intra-aortic Balloon Pump

Asaio Journal, 1992

A new generation, closed loop, fully automatic intraaortic balloon pump (CL-IABP) system continuo... more A new generation, closed loop, fully automatic intraaortic balloon pump (CL-IABP) system continuously optimizes diastolic augmentation by adjusting balloon pump parameters beat by beat without operator intervention. In dogs in sinus rhythm and with experimentally induced arrhythmias, the new CL-IABP system provided safe, effective augmentation. To investigate the system's suitability for clinical use, 10 patients meeting standard indications for IABP were studied. The patients were pumped by the fully automatic IABP system for an average of 20 hr (range, 1-48 hr). At start-up, the system optimized pumping parameters within 7-20 sec. Evaluation of 186 recordings made at hourly intervals showed that inflation began within 20 msec of the dicrotic notch 99% of the time. In 100% of the recordings, deflation straddled the first half of ventricular ejection. Peak pressure across the balloon membrane averaged 55 mmHg and, in no case, exceeded 100 mmHg. Examination of the data showed that as soon as the system was actuated it provided consistently beneficial diastolic augmentation without any further operator intervention. Eight patients improved and two died (one of irreversible cardiogenic shock and one of ischemic cardiomyopathy). No complications were attributable to the investigational aspects of the system. A fully automated IABP is feasible in the clinical setting, and it may have advantages relative to current generation IABP systems.

Research paper thumbnail of Using Concept Analysis to Detect Co-Change Patterns

Software systems need to change over time to cope with new requirements, and due to design decisi... more Software systems need to change over time to cope with new requirements, and due to design decisions, the changes happen to crosscut the system's structure. Understanding how changes appear in the system can reveal hidden dependencies between different entities of the system. We propose the usage of concept analysis to identify groups of entities that change in the same way and in the same time. We apply our approach at different levels of abstraction (i.e., method, class, package) and we detect fine grained changes (i.e., statements were added in a class, but no method was added there). Concept analysis is a technique that identifies entities that have the same properties, but it requires manual inspection due to the large number of candidates it detects. We propose a heuristic that dramatically eliminate the false positives. We apply our approach on two case studies and we show how we can identify hidden dependencies and detect bad smells.

Research paper thumbnail of Diagnosing Design Problems in Object Oriented Systems

Software decay is a phenomenon that plagues aging software systems. While in recent years, there ... more Software decay is a phenomenon that plagues aging software systems. While in recent years, there has been significant progress in the area of automatic detection of "code smells" on one hand, and code refactorings on the other hand, we claim that existing restructuring practices are seriously hampered by their symptomatic and informal (non-repeatable) nature. This paper makes a clear distinction between structural problems and structural symptoms (also known as code smells), and presents a novel, causal approach to restructuring object oriented systems. Our approach is based on two innovations: the encapsulation of correlations of symptoms and additional contextual information into higher-level design problems, and the univocal, explicit mapping of problems to unique refactoring solutions. Due to its explicit, repeatable nature, the approach shows high potential for increased levels of automation in the restructuring process, and consequently a decrease in maintenance costs.

Research paper thumbnail of Low parasitic elements and self aligned contacts technology for high frequency bipolar integrated circuits

A new high performance technology (with low parasitic elements) for high frequency bipolar circui... more A new high performance technology (with low parasitic elements) for high frequency bipolar circuits is proposed. The new technologies upgrade a classical “LISA” (local implantation self aligned) technology using a 14 masks process. The demonstrator circuits are a “Gilbert” cell, and some broad band high frequency amplifiers

Research paper thumbnail of From Microgrids to Smart Grids: Modeling and simulating using graphs part II optimization of reactive power flow

The Smart Grid of the future will be created starting from Smart Microgrids. The modeling of Micr... more The Smart Grid of the future will be created starting from Smart Microgrids. The modeling of Microgrids and the simulations of their real time steady state status is presented in the paper. The model is created using graphs. This paper continues a previous one, which dealt with the active power flow. This time the reactive power flow and its optimization are considered. A Windows type application created based on the model is presented. This powerful tool can be used to evaluate the total loss when an electrical network based on RES has to be designed. It can be used to optimize the links between nodes, the reactive power control devices optimal placement and optimal reactive power generation/compensation. From these operations result decreased losses (costs).

Research paper thumbnail of The Large Gyromagnetic Effect in FeSiB Amorphous Wires

Journal of The Magnetics Society of Japan, 1999

... 5, SEPTEMBER 1997 Large Gyromagnetic Effect in FeSiB Amorphous Wires Horia Chiriac, Catalin-S... more ... 5, SEPTEMBER 1997 Large Gyromagnetic Effect in FeSiB Amorphous Wires Horia Chiriac, Catalin-Sandrino Marinescu, and Tibor-Adrian Ovari National Institute of ... the LGE has been also considered by replacing the initial coil with a shorter one - 5 mm long - and a longer one ...

Research paper thumbnail of From Microgrids to Smart Grids: Modeling and simulating using graphs. Part I active power flow

The Smart Grid of the future will be created starting from Smart Microgrids. The modelling of Mic... more The Smart Grid of the future will be created starting from Smart Microgrids. The modelling of Microgrids and the simulations of their real time steady state status is presented in the paper. The model is created using graphs. A Windows type application created based on the model is presented. This powerful tool can be used to evaluate the total loss when an electrical network has to be designed and it can be used to optimize the links between nodes and the storage dealt devices optimal placement and optimal power, too. From these operations result decreased losses (costs).

Research paper thumbnail of Temperature dependence of the magneto-impedance effect in Co-rich amorphous glass-covered wires

Journal of Magnetism and Magnetic Materials, 2000

Results on the temperature dependence of the magneto-impedance response of Co68.15Fe4.35Si12.5B15... more Results on the temperature dependence of the magneto-impedance response of Co68.15Fe4.35Si12.5B15 amorphous glass-covered wires between room and Curie temperatures are reported for the first time. The largest response is obtained at room temperature, the magnitude of the effect decreasing with the increase of temperature. An increase of the magneto-impedance response is observed just below the Curie point.

Research paper thumbnail of Large gyromagnetic effect in soft magnetic amorphous ribbons and wires

Journal of Magnetism and Magnetic Materials, 2000

We report results on the Einstein–de Haas rotation of Fe77.5Si7.5B15 amorphous ribbons and wires,... more We report results on the Einstein–de Haas rotation of Fe77.5Si7.5B15 amorphous ribbons and wires, a phenomenon called large gyromagnetic effect. The laws of this effect are firstly inferred from the experimental data, and then a comprehensive model that explains these laws is presented.

Research paper thumbnail of Magneto-Impedance Effect in Amorphous and Nanocrystalline Glass-Covered Wires

Journal of The Magnetics Society of Japan, 1999

The magnetoimpedance effect in several Co-rich amorphous ribbons is overviewed. Results are class... more The magnetoimpedance effect in several Co-rich amorphous ribbons is overviewed. Results are classified in the following sections: influence of anisotropies induced by stress annealing, dependence on applied stress, its dependence on stress or stress-impedance, and the appearance of hysteresis. The influence of nanocrystallization of given Fe-rich ribbons is also analyzed.

Research paper thumbnail of Initial Clinical Trial of a Closed Loop, Fully Automatic Intra-aortic Balloon Pump

Asaio Journal, 1992

A new generation, closed loop, fully automatic intraaortic balloon pump (CL-IABP) system continuo... more A new generation, closed loop, fully automatic intraaortic balloon pump (CL-IABP) system continuously optimizes diastolic augmentation by adjusting balloon pump parameters beat by beat without operator intervention. In dogs in sinus rhythm and with experimentally induced arrhythmias, the new CL-IABP system provided safe, effective augmentation. To investigate the system's suitability for clinical use, 10 patients meeting standard indications for IABP were studied. The patients were pumped by the fully automatic IABP system for an average of 20 hr (range, 1-48 hr). At start-up, the system optimized pumping parameters within 7-20 sec. Evaluation of 186 recordings made at hourly intervals showed that inflation began within 20 msec of the dicrotic notch 99% of the time. In 100% of the recordings, deflation straddled the first half of ventricular ejection. Peak pressure across the balloon membrane averaged 55 mmHg and, in no case, exceeded 100 mmHg. Examination of the data showed that as soon as the system was actuated it provided consistently beneficial diastolic augmentation without any further operator intervention. Eight patients improved and two died (one of irreversible cardiogenic shock and one of ischemic cardiomyopathy). No complications were attributable to the investigational aspects of the system. A fully automated IABP is feasible in the clinical setting, and it may have advantages relative to current generation IABP systems.

Research paper thumbnail of Using Concept Analysis to Detect Co-Change Patterns

Software systems need to change over time to cope with new requirements, and due to design decisi... more Software systems need to change over time to cope with new requirements, and due to design decisions, the changes happen to crosscut the system's structure. Understanding how changes appear in the system can reveal hidden dependencies between different entities of the system. We propose the usage of concept analysis to identify groups of entities that change in the same way and in the same time. We apply our approach at different levels of abstraction (i.e., method, class, package) and we detect fine grained changes (i.e., statements were added in a class, but no method was added there). Concept analysis is a technique that identifies entities that have the same properties, but it requires manual inspection due to the large number of candidates it detects. We propose a heuristic that dramatically eliminate the false positives. We apply our approach on two case studies and we show how we can identify hidden dependencies and detect bad smells.

Research paper thumbnail of Diagnosing Design Problems in Object Oriented Systems

Software decay is a phenomenon that plagues aging software systems. While in recent years, there ... more Software decay is a phenomenon that plagues aging software systems. While in recent years, there has been significant progress in the area of automatic detection of "code smells" on one hand, and code refactorings on the other hand, we claim that existing restructuring practices are seriously hampered by their symptomatic and informal (non-repeatable) nature. This paper makes a clear distinction between structural problems and structural symptoms (also known as code smells), and presents a novel, causal approach to restructuring object oriented systems. Our approach is based on two innovations: the encapsulation of correlations of symptoms and additional contextual information into higher-level design problems, and the univocal, explicit mapping of problems to unique refactoring solutions. Due to its explicit, repeatable nature, the approach shows high potential for increased levels of automation in the restructuring process, and consequently a decrease in maintenance costs.

Research paper thumbnail of Low parasitic elements and self aligned contacts technology for high frequency bipolar integrated circuits

A new high performance technology (with low parasitic elements) for high frequency bipolar circui... more A new high performance technology (with low parasitic elements) for high frequency bipolar circuits is proposed. The new technologies upgrade a classical “LISA” (local implantation self aligned) technology using a 14 masks process. The demonstrator circuits are a “Gilbert” cell, and some broad band high frequency amplifiers

Research paper thumbnail of From Microgrids to Smart Grids: Modeling and simulating using graphs part II optimization of reactive power flow

The Smart Grid of the future will be created starting from Smart Microgrids. The modeling of Micr... more The Smart Grid of the future will be created starting from Smart Microgrids. The modeling of Microgrids and the simulations of their real time steady state status is presented in the paper. The model is created using graphs. This paper continues a previous one, which dealt with the active power flow. This time the reactive power flow and its optimization are considered. A Windows type application created based on the model is presented. This powerful tool can be used to evaluate the total loss when an electrical network based on RES has to be designed. It can be used to optimize the links between nodes, the reactive power control devices optimal placement and optimal reactive power generation/compensation. From these operations result decreased losses (costs).

Research paper thumbnail of The Large Gyromagnetic Effect in FeSiB Amorphous Wires

Journal of The Magnetics Society of Japan, 1999

... 5, SEPTEMBER 1997 Large Gyromagnetic Effect in FeSiB Amorphous Wires Horia Chiriac, Catalin-S... more ... 5, SEPTEMBER 1997 Large Gyromagnetic Effect in FeSiB Amorphous Wires Horia Chiriac, Catalin-Sandrino Marinescu, and Tibor-Adrian Ovari National Institute of ... the LGE has been also considered by replacing the initial coil with a shorter one - 5 mm long - and a longer one ...

Research paper thumbnail of From Microgrids to Smart Grids: Modeling and simulating using graphs. Part I active power flow

The Smart Grid of the future will be created starting from Smart Microgrids. The modelling of Mic... more The Smart Grid of the future will be created starting from Smart Microgrids. The modelling of Microgrids and the simulations of their real time steady state status is presented in the paper. The model is created using graphs. A Windows type application created based on the model is presented. This powerful tool can be used to evaluate the total loss when an electrical network has to be designed and it can be used to optimize the links between nodes and the storage dealt devices optimal placement and optimal power, too. From these operations result decreased losses (costs).

Research paper thumbnail of Temperature dependence of the magneto-impedance effect in Co-rich amorphous glass-covered wires

Journal of Magnetism and Magnetic Materials, 2000

Results on the temperature dependence of the magneto-impedance response of Co68.15Fe4.35Si12.5B15... more Results on the temperature dependence of the magneto-impedance response of Co68.15Fe4.35Si12.5B15 amorphous glass-covered wires between room and Curie temperatures are reported for the first time. The largest response is obtained at room temperature, the magnitude of the effect decreasing with the increase of temperature. An increase of the magneto-impedance response is observed just below the Curie point.