bluuebunny/crossref_metadata_2025_split huggingface dataset:
Modeling local nonlinear correlations using subspace principal curves
Authors: Reddy Chandan K. , Aziz Mohammad S. 
Published: September 2010

AbstractWhile analyzing some of the complex real‐world datasets, it is vital to identify local correlations in the subspaces. Some of the critical limitations of the subspace clustering techniques in identifying order revealing subspace correlation patterns motivate the need for more advanced subspace techniques. We formalize the problem of identifying local nonlinear correlations in high‐dimensional data and build subspace models to capture such correlations. In this paper, we propose a new method for computing subspace principal curve models which can effectively capture these local patterns in the data. We demonstrate the results of the proposed method using several real‐world datasets and highlight the advantages of our model compared to the other state‐of‐the‐art techniques proposed in the literature. We also show the improved performance of the proposed algorithm in related problems such as missing data imputation and regression analysis compared to some of the state‐of‐the‐art methods. © 2010 Wiley Periodicals, Inc. Statistical Analysis and Data Mining 3: 332‐349, 2010
Perceived contribution of indicator systems to sustainable development in developing countries
Authors: Krank Sabrina , Wallbaum Holger , Grêt‐Regamey Adrienne 
Published: September 2010

ABSTRACTThe contribution of indicators and indicator systems to sustainable development is discussed controversially – from positive and limited to negative impacts. Yet, the perception of the potential and risks of sustainability indicator systems influences the success of their implementation. In view of this correlation and the existing research gaps, we investigate the perceived contribution of indicator systems to sustainable development in five Asian cities of developing countries. Thirty interviews with local key actors have been held and a Qualitative Content Analysis has been conducted, drawing on the interview material. Results include a typology of positive and negative contributions based on the type of indicator systems' use, as well as a quantitative description of the level of awareness of different actors. Perceived positive and negative contributions are discussed considering the actors' functions, experiences and cities. The research shows that developers of sustainability indicator systems and scholars have the most awareness concerning risks whereas users and potential users are lacking this, and it portrays future implementation requirements. Copyright © 2010 John Wiley & Sons, Ltd and ERP Environment.
The analysis of case cohort design in the presence of competing risks with application to estimate the risk of delayed cardiac toxicity among Hodgkin Lymphoma survivors
Authors: Pintilie Melania , Bai Yan , Yun Lingsong , Hodgson David C. 
Published: September 2010

AbstractThe case‐cohort design is an economical solution to studying the association between an exposure and a rare disease. When the disease of interest has a delayed occurrence, then other types of event may preclude observation of the disease of interest giving rise to a competing risk situation. In this paper, we introduce a modification of the pseudolikelihood proposed by Prentice (Biometrika 1986; 73:1–11) for the analysis of case‐cohort design, to accommodate the existence of competing risks. The modification is based on the Fine and Gray (J. Amer. Statist. Assoc. 1999; 94:496–509) approach to enable the modeling of the hazard of subdistribution. We show through simulations that the estimate that maximizes this modified pseudolikelihood is almost unbiased. The predictive probabilities based on the model are close to the theoretical probabilities. The variance for the estimates can be calculated using the jackknife approach. An application of this method on the analysis of late cardiac morbidity among Hodgkin Lymphoma survivors is presented. Copyright © 2010 John Wiley & Sons, Ltd.
The Wnt/β-Catenin Signaling Pathway Tips the Balance Between Apoptosis and Reprograming of Cell Fusion Hybrids
Authors: Lluis Frederic , Pedone Elisa , Pepe Stefano , Cosma Maria Pia 
Published: September 2010

AbstractCell-cell fusion contributes to cell differentiation and developmental processes. We have previously showed that activation of Wnt/β-catenin enhances somatic cell reprograming after polyethylene glycol (PEG)-mediated fusion. Here, we show that neural stem cells and ESCs can fuse spontaneously in cocultures, although with very low efficiency (about 2%), as the hybrids undergo apoptosis. In contrast, when Wnt/β-catenin signaling is activated in ESCs and leads to accumulation of low amounts of β-catenin in the nucleus, activated ESCs can reprogram somatic cells with very high efficiency after spontaneous fusion. Furthermore, we also show that different levels of β-catenin accumulation in the ESC nuclei can modulate cell proliferation, although in our experimental setting, cell proliferation does not modulate the reprograming efficiency per se. Overall, the present study provides evidence that spontaneous fusion occurs, while the survival of the reprogramed clones is strictly dependent on induction of a Wnt-mediated reprograming pathway.
Expression and Proliferation-Promoting Role of Diversin in the Neuronally Committed Precursor Cells Migrating in the Adult Mouse Brain
Authors: Ikeda Makiko , Hirota Yuki , Sakaguchi Masanori , Yamada Osamu , Kida Yasuyuki S. , Ogura Toshihiko , Otsuka Takanobu , Okano Hideyuki , Sawamoto Kazunobu 
Published: September 2010

Abstract
The subventricular zone (SVZ) is the largest neurogenic region in the adult rodent brain. In the adult SVZ, unlike in the embryonic brain, neuronally committed precursor cells (neuroblasts) maintain their proliferative activity while migrating toward the olfactory bulb (OB), suggesting that they are inhibited from exiting the cell cycle. Little is known about the mechanisms underlying the unique ability of adult neuroblasts to proliferate during migration. Here, we studied the expression and function of Diversin, a component of the Wnt signaling pathways. In the neonatal and adult mouse brain, Diversin expression was observed in neuroblasts and mature neurons in the SVZ and hippocampus. Retrovirus-mediated overexpression of Diversin promoted the proliferation of neuroblasts and increased the number of neuroblasts that reached the OB. Conversely, the knockdown of Diversin decreased the proliferation of neuroblasts. Our results indicate that Diversin plays an important role in the proliferation of neuroblasts in the SVZ of the adult brain.
Recent Progress in Neural Probes Using Silicon MEMS Technology
Authors: Ruther Patrick , Herwik Stanislav , Kisban Sebastian , Seidl Karsten , Paul Oliver 
Published: September 2010

AbstractExtracellular recordings from the brain are the basis for the fundamental understanding of the complex interaction of electrical signals in neural information transfer. Going beyond wire electrodes and bundles of electrode wires such as tetrodes, multielectrode arrays based on silicon technologies are receiving growing attention, since they enable a pronounced increase in the number of recording sites per probe shaft. In this paper, recent innovations contributed by the authors to the development of probe arrays based on microelectromechanical system (MEMS) technologies within the EU‐funded research projectNeuroProbesare described. The resulting structures include passive electrode arrays based on single‐shaft and four‐shaft probes comprising nine planar electrodes per shaft with lengths of up to 8 mm. Further, active probe arrays with complementary metal–oxide–semiconductor (CMOS) circuitry integrated on the probe shaft, enabling the arrangement of 188 electrodes in two columns along a 4‐mm‐long probe shaft with an electrode pitch of only 40 µm, are described. These active probes were developed for an electronic depth control. Further, the paper reports assembly technologies for combining the probe arrays with highly flexible ribbon cables. Applications of the probes inin vivoexperiments are summarized. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Localization of a Partial Discharge Source Using Maximum Likelihood Estimation
Authors: Ishimaru Hirokazu , Kawada Masatake 
Published: September 2010

AbstractAnalyzing the electromagnetic waves generated by partial discharges is effective to assess insulation degeneration. In this paper, we describe a locating method for a partial discharge source based on maximum likelihood estimation. This method uses the root mean square and the direction of arrival of partial discharge signals which are calculated from measurement data obtained using sensors. This information is integrated using the maximum likelihood method. In this case, only the signals received in a good reception condition are used because the signals affected by multipath effects can decrease the estimation accuracy. This paper considers the case that apparatuses interrupt the direct paths from a partial discharge source to sensors. The capability of the proposed method was confirmed by simulations using the finite difference time domain method. The results include the comparison of performance for the number of sensors and show that this method has enough resolution to detect partial discharge sources. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Incorporating Penalty Function to Reduce Spill in Stochastic Dynamic Programming Based Reservoir Operation of Hydropower Plants
Authors: Kumar Jha Deependra , Yorino Naoto , Zoka Yoshifumi , Sasaki Yutaka , Hayashi Yuki , Iwata Kajunoni , Oe Ryuji 
Published: September 2010

AbstractThis paper proposes a framework that includes a penalty function incorporated stochastic dynamic programming (SDP) model in order to derive the operation policy of the reservoir of a hydropower plant, with an aim to reduce the amount of spill during operation of the reservoir. SDP models with various inflow process assumptions (independent and Markov‐I) are developed and executed in order to derive the reservoir operation policies for the case study of a storage type hydropower plant located in Japan. The policy thus determined consists of target storage levels (end‐of‐period storage levels) for each combination of the beginning‐of‐period storage levels and the inflow states of the current period. A penalty function is incorporated in the classical SDP model with objective function that maximizes annual energy generation through operation of the reservoir. Due to the inclusion of the penalty function, operation policy of the reservoir changes in a way that ensures reduced spill. Simulations are carried out to identify reservoir storage guide curves based on the derived operation policies. Reservoir storage guide curves for different values of the coefficient of penalty function α are plotted for a study horizon of 64 years, and the corresponding average annual spill values are compared. It is observed that, with increasing values of α, the average annual spill decreases; however, the simulated average annual energy value is marginally reduced. The average annual energy generation can be checked vis‐à‐vis the average annual spill reduction, and the optimal value of α can be identified based on the cost functions associated with energy and spill. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Phase Load Balancing in Distribution Power System Using Discrete Passive Compensator
Authors: Xuan Tung Nguyen , Fujita Goro , Horikoshi Kazuhiro 
Published: September 2010

AbstractThis paper describes a new proposal to deal with the unbalanced phase loading phenomenon in power distribution systems. Discrete switched passive shunt compensators such as reactors or capacitor banks are considered as the means to compensate for the imbalance. The discrete switched passive compensator offers advantages in term of installation cost and simplifies the maintenance process. A new algorithm is developed to calculate the size of discrete compensators, and this algorithm incorporates the unbalanced power flow calculation module and the optimal compensator sizing module. In addition, the algorithm is written in MATLAB language and tested on an actual three phase‐three wire distribution feeder. Extensive tests have validated the effectiveness of the proposal and shown that this proposal can be a useful tool for any electrical utilities. Copyright © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
A New Simple Model of Direct Spectral Irradiance with Easily Observable Atmospheric Parameters
Authors: Oke Shinichiro , Fukushige Naoyuki , Kemmoku Yoshishige , Takikawa Hirofumi , Sakakibara Tateki , Araki Kenji 
Published: September 2010

AbstractDirect irradiance and direct spectral irradiance were measured for 16 months along with other basic atmospheric parameters. The direct irradiance changed smoothly on a clear day and fluctuated on a fair day. Then, we considered the possibility of a new, simple model of direct spectral irradiance expressed with fewer atmospheric parameters and applicable for even fair days. This new model, called DISPEC, can calculate the direct spectral irradiance from basic atmospheric parameters for wavelengths >400 nm. In DISPEC, the ozone absorption was ignored and the thin cloud effect was taken into account as a new parameter, which was considered to be proportional to the direct irradiance, instead of aerosol parameters. The performance of DISPEC was then compared with that of a well‐known model of SPCTRAL2. Although the calculation results by SPCTRAL2 exhibited considerable error, especially in visible wavelength range on a fair day, those calculated using DISPEC showed good agreement with observed data on both clear and fair days. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Automatic Estimation of Gestational Age in Ultrasound Images Based on Direct Least‐Squares Fitting of Ellipse
Authors: Marhaban M. H. , Kaid Rakeeb S. , Mohd Noor Samsul B. 
Published: September 2010

AbstractMeasurement of the fetal head biparietal diameter (BPD) and head circumference (HC) is crucial for estimation of fetal age. Due to the noisy nature of ultrasound images and variation in image acquisition and measurement techniques, manual measurements of these parameters are subject to inter‐ and intraobserver variability. In this study, we present an approach for estimation of gestational age in ultrasound images, based on direct least‐squares fitting of an ellipse. The process goes through three steps: image preprocessing, object extraction, and fitting an ellipse to the resultant shape and measuring its parameters. The proposed technique was tested and evaluated on 20 ultrasound images of fetal head. The images had a combination of noise and low contrast. Excellent linear correlation between manual and automatic measurement was obtained, which verifies the reliability of the proposed automatic approach. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Voltage Limiter Calculation Method for Fast Torque Response of IPMSM in Overmodulation Range
Authors: Lerdudomsak Smith , Doki Shinji , Okuma Shigeru 
Published: September 2010

AbstractIn this paper, a voltage limiter calculation method for fast torque response of an interior permanent magnet synchronous motor (IPMSM) when an inverter operates in the overmodulation range is considered. The relation between the torque response of an IPMSM and the voltage phase angle in the overmodulation range is analyzed and, based on this relation, the optimal voltage limiter calculation method that can be realized by real‐time calculation is proposed. By using the proposed method, torque response of an IPMSM can be improved nearly twice as fast as the case of conventional methods. The effectiveness of the proposed method is confirmed by the simulation and experimental results. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Remote Monitoring Integrated State Variables for AR Model Prediction of Daily Total Building Air‐Conditioning Power Consumption
Authors: Ninagawa Chuzo , Sato Tomotaka 
Published: September 2010

AbstractIt is extremely difficult to predict daily accumulated power consumption of the entire building air‐conditioning facilities because of a huge number of variables. We propose new integrated state variables, i.e. the daily operation amount and the daily operation‐capacity‐weighted average set temperature. Taking advantage of a remote monitoring technology, time series data of the integrated state variables were collected and an autoregressive (AR) model prediction for the daily total power consumption has been tried. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
A White LED Driver Using a Buck–Boost Converter
Authors: Eguchi Kei , Pongswatd Sawai , Watanabe Toshiya , Pannil Pittaya , Tirasesth Kitti , Sasaki Hirofumi 
Published: September 2010

AbstractFor mobile backlighting applications, a white LED (WLED) driver using a buck–boost converter is proposed in this letter. Unlike conventional converters using boost converters, 2×/1.5× charge pumps, and so on, the proposed converter offers the negative stepped‐down voltage to drive the LED's cathode only when the input voltage is insufficient to drive a 1× transfer mode. Furthermore, unlike the LED backlight using charge pumps, the proposed converter can adjust the output voltage by controlling the duty factor of the clock pulse. Thus, the proposed converter can realize high power efficiency. The validity of the proposed converter is confirmed by simulations and experiments. © 2010 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.
Averaged Index Ratio State‐Space Model and Kalman Filtering
Authors: Polishchuk Alexander Ya. 
Published: September 2010

AbstractA theoretical model describing joint dynamics of a spot Index (e.g. Libor), an Averaged Index (e.g. BMA) and the respective ratio is suggested. A convolution‐like “coupling” between the two indices is introduced. The model is represented as a system of stochastic algebraic and differential equations. The Kalman Filter technique is proposed as a tool to calibrate the model. Transition from real world to risk‐neutral measure is considered. An example of calibration based on recently observed market rates is provided. A Kalman Filter‐based hedging is discussed.
Complex Logarithms and the Piecewise Constant Extension of the Heston Model
Authors: Afshani Shamim 
Published: September 2010

AbstractThe (Heston, 1993) model features an analytical characteristic function. It is well known that discontinuities can arise in the original formulation of the function, when the complex logarithm therein is restricted to its principal branch. In recent years, however, an alternative formulation has emerged. For this alternative, it has been established that discontinuities cannot arise, within the strip of regularity, when restricting the corresponding complex logarithm in this manner. For a region of this strip, we extend the analysis by allowing for piecewise constant parameters. Within this semi‐analytical framework, our results cater for both European and Forward Starting options.1
Susceptibility and resistance to ethanol in Saccharomyces strains isolated from wild and fermentative environments
Authors: Arroyo‐López F. N. , Salvadó Z. , Tronchoni J. , Guillamón J. M. , Barrio E. , Querol A. 
Published: September 2010

AbstractIn this work, we apply statistical modelling techniques to study the influence of increasing concentrations of ethanol on the overall growth of 29 yeast strains belonging to different Saccharomyces and non‐Saccharomyces species. A modified Gompertz equation for decay was used to objectively estimate the noninhibitory concentration (NIC) and minimum inhibitory concentration (MIC) for the assayed strains to ethanol, which are related to the susceptibility and resistance of yeasts to this compound, respectively. A first ANOVA analysis, grouping strains as a function of their respective Saccharomyces species, revealed that S. cerevisiae was the yeast with the highest, and statistically significant, ethanol resistance value. Then, a second factorial ANOVA analysis, using the origin of strains (wild or fermentative) and their taxonomic classification (S. cerevisiae, S. paradoxus or S. bayanus var. uvarum) as categorical predictor variables, showed that no significant differences for the NIC and MIC parameters were found between both ecological niches within the same species, indicative that these physiological characteristics were presumably not modified throughout the adaptation to human‐manipulated fermentative environments. Finally, differences among selected strains with respect to ethanol tolerance were correlated to the initial contents of unsaturated fatty acids, mainly oleic acid. Copyright © 2010 John Wiley & Sons, Ltd.
Two Ala‐Gln Dipeptide‐based Supramolecular Layers Decorated with Amino Acid Residues
Authors: Lou Benyong , Huang Xiaodong , Lin Qi 
Published: September 2010

Abstractl‐Alanyl‐glutamine dipeptide assembles with CuII ions to give the 2D coordination framework [Cu2(C8H13N3O4)2·2H2O]n (1) in which amino acid residues result in specific void space. In presence of 4,4′‐bipyridine, framework 1 is turned into a binuclear complex [Cu2(C8H13N3O4)2(H2O)2(C10H8N2)·8H2O] (2), which is further linked into a 2D hydrogen‐bonded layer in which amino acid residues induce a hydrogen‐bonded water cluster containing eight water molecules in the void space.
Binuclear Iron(I) Complex Containing Bridging Phenanthrene‐4,5‐dithiolate Ligand: Preparation, Spectroscopy, Crystal Structure, and Electrochemistry
Authors: Mebi Charles A. , Noll Bruce C. , Gao Ruixiao , Karr Derek 
Published: September 2010

AbstractA diiron hexacarbonyl complex containing bridging phenanthrene‐4,5‐dithiolate ligand is prepared by oxidative addition of Phenanthro[4,5‐cde][1,2]dithiin to Fe2(CO)9. The complex is investigated as a model for the active site of the [Fe–Fe] hydrogenase enzyme. The compound, [(μ‐PNT)Fe2(CO)6]; (PNT = phenanthrene‐4,5‐dithiolate), was characterized by spectroscopic methods (IR, UV/Vis and NMR) and X‐ray crystallography. The IR and proton NMR spectra of [(μ‐PNT)Fe2(CO)6] (4) are in agreement with a PNT ligand attached to a Fe2(CO)6 core. The infrared spectrum of 4 recorded in dichloromethane contains three peaks at 2001, 2040, and 2075 cm–1 corresponding to the stretching frequency of terminal metal carbonyls. X‐ray crystallographic study unequivocally confirms the structure of the complex having a butterfly shape with an Fe–Fe bond length of 2.5365 Å close to that of the enzyme (2.6 Å). Electrochemical properties of [(μ‐PNT)Fe2(CO)6] have been investigated by cyclic voltammetry. The cyclic voltammogram of [(μ‐PNT)Fe2(CO)6] recorded in acetonitrile contains one quasi‐irreversible reduction (E1/2 = –0.84 V vs. Ag/AgCl, Ipc/Ipa = 0.6, ΔEp = 131 V at 0.1 V·s–1) and one irreversible oxidation (Epa = 0.86 V vs. Ag/AgCl). The redox of [(μ‐PNT)Fe2(CO)6] at E1/2 = –0.84 V can be assigned to the one‐electron transfer processes; [FeI–FeI] → [FeI–Fe0] and [FeI–Fe0] → [FeI–FeI].
Melemium Hydrogensulfate H3C6N7(NH2)3(HSO4)3 – the First Triple Protonation of Melem
Authors: Sattler Andreas , Schnick Wolfgang 
Published: September 2010

AbstractWe synthesized melemium hydrogensulfate H3C6N7(NH2)3(HSO4)3 by reaction of melem with 70 % sulfuric acid. The crystal structure was elucidated by single‐crystal XRD (P21/n (no. 14), Z = 4, a = 10.277(2), b = 14.921(3), c = 11.771(2) Å, β = 99.24(3)°, V = 1781.5(6) Å3). H3C6N7(NH2)3(HSO4)3 is the first compound displaying a triple protonation of melem., In this contribution an overview of accessible melemium sulfates depending on the concentration of sulfuric acid is given. Two additional melemium sulfates were identified this way.