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Active EMI Filter for medium and high Power Converters
S. Skibin,B. Wunsch,V. Forsstrom 전력전자학회 2023 ICPE(ISPE)논문집 Vol.2023 No.-
In this work, an active EMI filter for medium and high-power converters is demonstrated and discussed. The active EMI filter prototype has been installed in a 75 kW motor drive and benchmarked vs. passive EMI filter showing excellent performance in a frequency range from 150 kHz up to several MHz and stable operation in all tested operation regimes.
Collision Tumor Composed of Meningioma and Cavernoma
Weigel, Jens,Neher, Markus,Schrey, Michael,Wunsch, Peter H.,Steiner, Hans-Herbert The Korean Neurosurgical Society 2017 Journal of Korean neurosurgical society Vol.60 No.1
A true collision tumor is a rare entity composed of two histologically distinct neoplasms coinciding in the same organ. This paper reports a unique case of cerebral collision tumor consisting of two benign components. On the first hand, meningioma which is usually a benign lesion arising from the meningothelial cell in the arachnoidal membrane. On the other, cerebral cavernoma which is a well-circumscribed, benign vascular hamartoma within the brain. To our knowledge, there is no previously documented case of cerebral collision tumor consisting of two benign components. A 56-year-old Caucasian male suffered in 2002 from an atypical meningioma WHO $II^{\circ}$ located in the left lateral ventricle. Three years after the tumor extirpation, the patient suffered from a hematoma in the fourth ventricle due to a recurrently haemorrhaged cavernoma. In 2008, a recurrence of the tumor in the left lateral ventricle was discovered. Additionally, another tumor located in the quadrigeminal lamina was detected. After surgical resection of the tumor in the left lateral ventricle, the pathological examination confirmed the diagnosis of a collision tumor consisting of components of a meningioma WHO $II^{\circ}$ and a cavernoma. Postoperatively, no adjuvant treatment was needed and no tumor recurrence is discovered up to the present. A possible explanation for the collision of those two different tumors may be migration of tumor cells mediated by the cerebrospinal fluid. After 5-years of follow-up, there is no sign of any tumor recurrence; therefore, surgical tumor removal without adjuvant therapy seems to be the treatment of choice.
Expression in Escherichia coli of a Putative Human Acetohydroxyacid Synthase
Chang,Soo-Ik,Kartikasari,Apriliana E.R.,Wunsch,Rebecca M.,Lee,Yu-Ting,Kil,Mee-Wha,Shin,Ju-Young,Duggleby,Ronald G. The Korea Science and Technology Center 2000 BMB Reports Vol.33 No.3
A human gene has been reported that may encode the enzyme acetohydroxyacid synthase. Previously this enzyme was thought to be absent from animals although it is present in plants and many microorganisms. In plants, this enzyme is the target of a number of commercial herbicides and the use of these compounds may need to be reassessed if the human enzyme exists and proves to be susceptible to inhibition. Here we report the construction of several plasmid vectors containing the cDNA sequence for this protein, and their expression in Escherichia coli. High levels of expression were observed, but most of the protein proved to be insoluble. The small amounts of soluble protein contained little or no acetohydroxyacid synthase activity. Attempt to refold the insoluble protein were successful insofar as the protein became soluble. However, the refolded protein did not gain any acetohydroxyacid synthase activity. In vivo complementation tests of an E. coli mutant produced no evidence that the protein is active. Incorrect folding, or the lack of another subunit, may explain the data but we favor the interpretation that this gene does not encode an acetohydroxyacid synthase.
A Game-theoretical Approach for a Finite-time Consensus of Secondorder Multi-agent System
Lei Xue,Changyin Sun,Donald C. Wunsch II 제어·로봇·시스템학회 2019 International Journal of Control, Automation, and Vol.17 No.5
The second-order consensus problem depends on not only the topology condition but also the couplingstrength of the relative positions and velocities between neighboring agents. This paper seeks to solve the finitetimeconsensus problem of second-order multi-agent systems by games with special structures. Potential gameand weakly acyclic game were applied for modeling the second-order consensus problem with different topologies. Furthermore, this paper introduces the event-triggered asynchronous cellular learning automata algorithm foroptimizing the decision making process of the agents, which facilitates a convergence with the Nash equilibrium. Finally, numerical examples illustrate the effectiveness of the models.
Expression in Escherichia coli of a Putative Human Acetohydroxyacid Synthase
Duggleby, Ronald G.,Kartikasari, Apriliana E.R.,Wunsch, Rebecca M.,Lee, Yu-Ting,Kil, Mee-Wha,Shin, Ju-Young,Chang, Soo-Ik Korean Society for Biochemistry and Molecular Biol 2000 Journal of biochemistry and molecular biology Vol.33 No.3
A human gene has been reported that may encode the enzyme acetohydroxyacid synthase. Previously this enzyme was thought to be absent from animals although it is present in plants and many microorganisms. In plants, this enzyme is the target of a number of commercial herbicides and the use of these compounds may need to be reassessed if the human enzyme exists and proves to be susceptible to inhibition. Here we report the construction of several plasmid vectors containing the cDNA sequence for this protein, and their expression in Escherichia coli. High levels of expression were observed, but most of the protein proved to be insoluble. The small amounts of soluble protein contained little or no acetohydroxyacid synthase activity. Attempts to refold the insoluble protein were successful insofar as the protein became soluble. However, the refolded protein did not gain any acetohydroxyacid synthase activity. In vivo complementation tests of an E. coli mutant produced no evidence that the protein is active. Incorrect folding, or the lack of another subunit, may explain the data but we favor the interpretation that this gene does not encode an acetohydroxyacid synthase.
Decentralized Neural Network-based Excitation Control of Large-scale Power Systems
Wenxin Liu,Jagannathan Sarangapani,Ganesh K. Venayagamoorthy,Li Liu,Donald C. Wunsch II,Mariesa L. Crow,David A. Cartes 대한전기학회 2007 International Journal of Control, Automation, and Vol.5 No.5
This paper presents a neural network based decentralized excitation controller design for large-scale power systems. The proposed controller design considers not only the dynamics of generators but also the algebraic constraints of the power flow equations. The control signals are calculated using only local signals. The transient stability and the coordination of the subsystem control activities are guaranteed through rigorous stability analysis. Neural networks in the controller design are used to approximate the unknown/imprecise dynamics of the local power system and the interconnections. All signals in the closed loop system are guaranteed to be uniformly ultimately bounded. To evaluate its performance, the proposed controller design is compared with conventional controllers optimized using particle swarm optimization. Simulations with a three-machine power system under different disturbances demonstrate the effectiveness of the proposed controller design.
Expression in Escherichia coli of a Putative Human Acetohydroxyacid Synthase
Chang, Soo Ik,Duggleby, Ronald G .,Kil, Mee Wha,Kartikasari, Apriliana E . R .,Wunsch, Rebecca M .,Lee, Yu Ting,Shin, Ju Young 생화학분자생물학회 2001 BMB Reports Vol.33 No.3
A human gene has been reported that may encode the enzyme acetohydroxyacid synthase. Previously this enzyme was thought to be absent from animals although it is present in plants and many microorganisms. In plants, this enzyme is the target of a number of commercial herbicides and the use of these compounds may need to be reassessed if the human enzyme exists and proves to be susceptible to inhibition. Here we report the construction of several plasmid vectors containing the cDNA sequence for this protein, and their expression in Escherichia coli. High levels of expression were observed, but most of the protein proved to be insoluble. The small amounts of soluble protein contained tittle or no acetohydroxyacid synthase activity. Attempts to refold the insoluble protein were successful insofar as the protein became soluble. However, the refolded protein did not gain any acetohydroxyacid synthase activity. In vivo complementation tests of an E. coli mutant produced no evidence that the protein is active. Incorrect folding, or the lack of another subunit, may explain the data but we favor the interpretation that this gene does not encode an acetohydroxyacid synthase.