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Multi-Step Commutation and Control Policies for Matrix Converters
Hofmann, Wilfried,Ziegler, Marcus The Korean Institute of Power Electronics 2003 JOURNAL OF POWER ELECTRONICS Vol.3 No.1
The commutation and control in matrix converters is more complicated as in voltage source converters. Natural freewheeling paths do not exist and the theoretic absent storage elements result in a direct coupled system of load and line currents as well as voltages. The paper offers an overview about staggered commutation and control policies in matrix converters. Based on the knowledge about load current direction and the signs of the line to line input voltages different multi-step commutation policies were derived. This paper examines the application of that policies in the case of space vector modulation and direct control methods with the focus on the resulting effects to the reference output voltage deviation.
Assessment of a HER2 scoring system for gastric cancer: results from a validation study
Hofmann, M,Stoss, O,Shi, D,Bü,ttner, R,van de Vijver, M,Kim, W,Ochiai, A,Rü,schoff, J,Henkel, T Blackwell Publishing Ltd 2008 Histopathology Vol.52 No.7
<P>Aims: </P><P>Human epidermal growth factor receptor 2 (HER2) overexpression/amplification is implicated in the development of various solid tumour types. Validated methods and scoring systems for evaluating HER2 status exist in breast cancer, but not in gastric cancer. The aim was to establish a HER2 scoring system for gastric cancer to identify suitable patients for enrolment in a trial of trastuzumab (Herceptin<SUP>®</SUP>) in advanced metastatic gastric cancer.</P><P>Methods and results: </P><P>Formalin-fixed paraffin-embedded gastric cancer samples were tested for HER2 status using the fluorescence <I>in situ</I> hybridization (FISH) pharmDx™ kit (Dako Denmark A/S). Immunohistochemistry (IHC) was performed using the HercepTest™ (Dako). Concordance between FISH and IHC was 93.5% in 168 evaluable samples. Eleven samples were scored as FISH+ but IHC− or equivocal.</P><P>Conclusions: </P><P>IHC/FISH discrepancies were attributed to basolateral membranous immunoreactivity of glandular cells resulting in incomplete membranous reactivity and/or a higher rate of tumour heterogeneity in gastric cancer compared with breast cancer. With modifications to the IHC scoring system, the HercepTest™ is considered valid for the identification of HER2+ gastric tumours for this clinical trial. Correlation of HER2 scores with clinical outcomes will be needed to determine which patients might benefit from trastuzumab therapy.</P>
Multi-Step Commutation and Control Policies for Matrix Converters
Hofmann. W,Ziegler. M 전력전자학회 2001 ICPE(ISPE)논문집 Vol.2001 No.10
The commutation and control in matrix converters is more complicated as in voltage source converters. Natural freewheeling paths do not exist and the theoretic absent storage elements result in a direct coupled system of load and line currents as well as voltages. The paper offers an overview about staggered commutation and control policies in matrix converters. Based on the knowledge about load current direction and the signs of the line to line input voltages different multi-step commutation policies were derived. This paper examines the application of that policies in the case of space vector modulation and direct control methods with the focus on the resulting effects to the reference output voltage deviation.<br/> Index terms - Matrix converter, commutation, control.
HOLOMORPHIC DERIVATIVES OF SIEGEL MODULAR FORMS
Hofmann, Eric,Kohnen, Winfried Korean Mathematical Society 2018 대한수학회보 Vol.55 No.5
In this paper, following a criterion of E. Yang and L. Yin we discuss whether on the Siegel half-space of genus $g{\geq}2$ a holomorphic derivative exists.