bluuebunny/crossref_metadata_2025_split huggingface dataset:
Improvement of frequency extraction accuracy of linear predictive analysis by a combination of autocorrelation and integral procedure for noise wave shape
Authors: Murakawa Kazuo , Ishiyama Fumihiko , Yamane Hiroshi , Hattori Mitsuo 
Published: September 2004

AbstractThe accurate and rapid identification or detection of the electrical noise sources causing noise malfunctions in communication equipment is an important issue in determining corrective measures. In this paper, we explain an improvement in the frequency extraction accuracy of linear predictive analysis for noise waveforms in order to identify the noise sources from noise waveforms such as the audible noise generated by communication equipment like telephones and noise currents penetrating into the communication equipment. In this study, we propose an improvement of the frequency extraction accuracy of linear predictive analysis by using correlation and integration. This method preserves specific frequency components of the original noise waveforms although correlation and integration are performed. In this paper, we divide the noise waveform into finite‐length segments, correlate and integrate the time series data within a given segment, and formulate dynamic frequency analysis (time–frequency analysis) based on linear predictive analysis for the time series data in the postprocessing. We also verify the effectiveness of the proposed method by using known noise waveforms. The result of applying the proposed method to a noise waveform that convolved white noise with sine wave signals having known frequencies was clearly the ability to extract the frequencies of the sine waves included in the noise waveform even for a signal‐to‐noise ratio (SNR) of 0 dB with an error range of about 10 to 15%. This assumes that the frequencies of the sine waves included in the noise can be extracted even under the worst case SNR due to the suppression of white noise by the correlation and the emphasis of the low‐frequency components by the integration. Thus, we show that the characteristic frequencies in the noise waveform can be accurately extracted by using linear predictive analysis combining correlation and integration, and present the remaining issues. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 1, 88(1): 1–11, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecja.20153
Direction of arrival estimation by means of genetic algorithm
Authors: Maruyama Takashi , Tsuji Yosuke , Kuwahara Yoshihiko 
Published: September 2004

AbstractThe estimation of arrival direction using the Hopfield neural network (HNN) has the feature that the wave number estimation, which is needed in the eigenvalue decomposition, is not required, and the signal with a high correlation can be estimated without applying the moving average. On the other hand, HNN is the local minimum search procedure, and it can be the case that the result of estimation may not be highly reliable. This study notes that the energy function of HNN is a scalar value that can be determined only by the output vector of the neuron. An arrival direction estimation algorithm is proposed, in which the output state of the neuron is determined by the genetic algorithm (GA) so that the energy is minimized, using the energy function as the evaluation function and the neuron output state as the chromosome. The effectiveness of the method is examined through Monte Carlo simulation and experiment. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 58–67, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20072
A study of spread code in the 2.4‐GHz‐band DS‐SS wireless LAN system
Authors: Mori Hiroki , Sasaoka Hideichi 
Published: September 2004

AbstractThe CCK scheme is often used in the 2.4‐GHz‐band DS‐SS wireless LAN system, but the degradation of the transmission quality due to the noise emphasis is a problem, since a hard‐decision decoding is applied to the decoding of information. As another aspect, few studies in the wireless LAN system have evaluated the co‐channel interference characteristics considering the cell allocation. Consequently, this study intends to improve the quality of the wireless LAN system. The maximum‐likelihood decoding is applied to MBOL system of spread code length 4, 8, and 16, and the proposed system using a spread code (code length 12). BER performance is evaluated. In addition, the spectrum efficiency is evaluated as dependent on the cell allocation, considering the interference characteristics. It is verified as a result of simulation that the system using the proposed spread code (code length 12, 16 kinds and minimum distance 6) is effective in terms of the BER performance and the spectrum efficiency. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 48–57, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20077
Performance estimation of surface acoustic wave motor using simulation model of friction drive
Authors: Asai Katsuhiko , Kurosawa Minoru Kuribayashi 
Published: September 2004

AbstractThe contact states of the slider and stator substrate greatly affect the drive performance of a surface acoustic wave motor. The contact states are determined by factors such as the friction coefficient, vibration amplitude, rigidity of the contact surface, contact time with the Rayleigh wave, and slider speed. A model was proposed that represented the relationship between these factors and the drive performance. However, guidance has not been provided on how these values should be changed to improve the drive performance. In this research, we use a friction drive model we proposed to analyze the effect of the changes in these parameters on the drive performance and to discuss the motor design and the drive conditions based on evaluations from the perspectives of the drive power, output, and efficiency. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 37–47, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ ecjc.20079
An m‐derived ladder high‐pass SAW filter
Authors: Misu Kochiro , Ibata Koji , Wadaka Shusou , Nagatsuka Tsutomu , Murai Koji , Yoshida Kenji 
Published: September 2004

AbstractSince excellent characteristics can be realized in the gigahertz range with a small size, SAW filters have been used widely as RF (radio frequency) filters for mobile communications terminals. In particular, since the insertion loss of the RF filter impacts the receiving sensitivity and transmitting power efficiency of the terminals, the demand for lower loss is substantial. In this paper, a one‐port SAW resonator is used as the series element and a series circuit consisting of a capacitor and an inductor is used as the shunt element in an m‐derived ladder filter. Its configuration, design procedure, and design and test results are presented. In spite of a simple circuit configuration, this filter can realize a low loss characteristic. The fabricated filter for 900 MHz exhibited excellent properties with an insertion loss of less than 1 dB and an out‐of‐band attenuation of more than 33 dB. The effectiveness of this filter is therefore demonstrated. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 27–36, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20091
Investigation of the model for path selection behavior in open space
Authors: Umemura Hiroyuki , Watanabe Hiroshi , Matsuoka Katsunori 
Published: September 2004

AbstractIn this study, we investigate the model for the human strategy of path selection behavior in an open space. In the experiment, a moving obstacle was displayed in an immersive virtual reality system. Subjects were required to walk from a start point to a goal point in the virtual space and their walking trajectories were measured. The model for the path selection strategy, composed of two stages of global path planning and local direction control, was proposed to account for the experimental results. In the global path planning stage, the model determined a transit position that minimizes an equation consisting of terms about walking distance and dangerousness. In the local direction control stage, a walking direction was calculated at every step to avoid a moving obstacle. The results of simulation well accounted for the experimental results in general. Moreover, we applied the model to the results of another experiment in order to investigate the generality of the model. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 18–26, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20111
Higher‐order correlation analysis of pitch fluctuations in sustained normal vowels by the method of surrogate data
Authors: Tokuda Isao , Miyano Takaya , Aihara Kazuyuki 
Published: September 2004

AbstractThe pitch fluctuations observed in the sustained pronunciation of voiced sounds are known to be indispensable for perception of voiced sound as natural human pronunciation. In speech synthesis, it is necessary to carefully identify the statistical properties of the pitch fluctuations that are required in order for the reproduced speech to maintain the quality of the original speech. From research to date, it is known that maintaining the second‐order correlation structure is important for the realization of natural pitch fluctuations. No information is available on the importance of higher‐order correlations above third order. In the present research, a higher‐order correlation analysis of pitch fluctuations is carried out by the surrogate method. The effect of the correlation structures of third and higher orders on the naturalness of vowels is studied. The results show that reproduction of the correlation configuration of third and higher orders is important in addition to the second‐order correlation in the synthesis of pitch fluctuations. Possible approaches based on nonlinear models are discussed. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 9–17, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20113
Three‐dimensional image input system using parallel projection images
Authors: Takahashi Hideya , Kimura Mitsuo , Shimizu Eiji 
Published: September 2004

AbstractRecently, three‐dimensional image display techniques have been implemented in a number of areas. In particular, in the medical field, three‐dimensional displays are needed for operation support displays and medical diagnosis. Three‐dimensional image display techniques can be subdivided into methods using binocular parallax and methods using holography. The former cause eye fatigue, while the latter involve an enormous amount of information and no suitable display device exists for them. In order to overcome these problems, the authors have proposed a method of reconstruction of parallax rays. In this method, rays are reconstructed in various directions from the display and a three‐dimensional image is created by the point light sources reconstructed at the intersections of the rays. This is a type of integral imaging method. Hence, in order to display three‐dimensional images, it is necessary to acquire the information about the rays to be reconstructed and to photograph the parallax images of the object. To this end, many cameras must be lined up, so that picture taking in a small space is difficult. Hence, in this paper we propose a three‐dimensional image input system using parallel projection images that can acquire ray information by simply moving a pinhole instead of using several moving cameras. An experimental system was built and the effectiveness of the present method was demonstrated. © 2004 Wiley Periodicals, Inc. Electron Comm Jpn Pt 3, 88(1): 1–8, 2005; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/ecjc.20116
Smooth transition exponential smoothing
Authors: Taylor James W. 
Published: September 2004

AbstractAdaptive exponential smoothing methods allow a smoothing parameter to change over time, in order to adapt to changes in the characteristics of the time series. However, these methods have tended to produce unstable forecasts and have performed poorly in empirical studies. This paper presents a new adaptive method, which enables a smoothing parameter to be modelled as a logistic function of a user‐specified variable. The approach is analogous to that used to model the time‐varying parameter in smooth transition models. Using simulated data, we show that the new approach has the potential to outperform existing adaptive methods and constant parameter methods when the estimation and evaluation samples both contain a level shift or both contain an outlier. An empirical study, using the monthly time series from the M3‐Competition, gave encouraging results for the new approach. Copyright © 2004 John Wiley & Sons, Ltd.
Combination forecasts of output growth in a seven‐country data set
Authors: Stock James H. , Watson Mark W. 
Published: September 2004

AbstractThis paper uses forecast combination methods to forecast output growth in a seven‐country quarterly economic data set covering 1959–1999, with up to 73 predictors per country. Although the forecasts based on individual predictors are unstable over time and across countries, and on average perform worse than an autoregressive benchmark, the combination forecasts often improve upon autoregressive forecasts. Despite the unstable performance of the constituent forecasts, the most successful combination forecasts, like the mean, are the least sensitive to the recent performance of the individual forecasts. While consistent with other evidence on the success of simple combination forecasts, this finding is difficult to explain using the theory of combination forecasting in a stationary environment. Copyright © 2004 John Wiley & Sons, Ltd.
Cryptic insertion producing two NUP98/NSD1 chimeric transcripts in adult refractory anemia with an excess of blasts
Authors: La Starza Roberta , Gorello Paolo , Rosati Roberto , Riezzo Antonio , Veronese Angelo , Ferrazzi Eros , Martelli Massimo F. , Negrini Massimo , Mecucci Cristina 
Published: September 2004

AbstractWe performed cytogenetic and molecular studies on an adult patient with refractory anemia with an excess of blasts with an add(11)(p15). Multicolor fluorescence in situ hybridization (FISH) identified the extra material on 11p as belonging to chromosome 15. Metaphase FISH with probes for chromosomes 5, 11, and 15 revealed a complex four‐break rearrangement. Clone RP5‐1173K1, containing exons 10–20 of the NUP98 gene, gave three fluorescence signals on the normal 11, the der(5), and the der(15). 3′‐RACE‐PCR identified an in‐frame fusion between NUP98 and NSD1, which was confirmed by RT‐PCR. Two different spliced forms, that is, NUP98 exon 11/NSD1 exon 6 and NUP98 exon 12/NSD1 exon 6, were detected. The reciprocal NSD1/NUP98 was not found. A dual‐color experiment with RP5‐1173K1 and CTC‐549A4, spanning the entire NSD1 gene, indicated an insertion of NUP98 into the NSD1 locus. This is the first report of an adult with myelodysplastic syndrome (MDS) harboring an NUP98/NSD1 fusion resulting from insertion of 5′‐NUP98 into the NSD1/5q35 locus. © 2004 Wiley‐Liss, Inc.
Evidence for a single clay/temper source for the manufacture of Middle and Late Helladic Aeginetan pottery from Asine, Greece
Authors: Dorais Michael J. , Lindblom Michael , Shriner Christine M. 
Published: September 2004

AbstractIn an effort to further characterize the Middle and Late Helladic pottery industry on Aegina, we have analyzed amphibole in 23 sherds imported to the coastal settlement of Asine. The sherds derive from vessels of different classes and shapes and range in age from MH I‐II to LH IIIB‐IIIC Early. All sherds come from vessels that carry manufacturing marks, and their amphiboles have compositions that are incompatible with those of Methana, Poros, and Melos. Twenty of the sherds have amphiboles that are identical in composition and overlap a narrow range of amphibole compositions found in specific lava flows on the northern portion of Aegina. Given that the dacites across Aegina contain amphiboles with a wide range in compositions, we suggest that the narrow range of amphibole compositions in the sherds indicates that they were derived from either a specific clay source on the island, located in a stream system southeast of the prehistoric settlement at Kolonna, or that the potters used a specific temper source along the same stream system. Multiple clay or temper sources would have produced sherds with a broader range of amphibole compositions reflecting the diversity of amphibole compositions found on Aegina. One sherd has amphibole compositions indicative of an additional Aeginetan component that is not found in the other sherds. Two sherds have amphiboles with compositions that do not match any known reference amphiboles for Aegina, Methana, Poros, or Melos. These may have been derived from still unsampled dacites on Aegina or have been manufactured from materials located outside the Saronic Gulf. © 2004 Wiley Periodicals, Inc.
Geoarchaeological context of late Pleistocene and early Holocene occupation at the Cooper's Ferry site, western Idaho, USA
Authors: Davis Loren G. , Schweger Charles E. 
Published: September 2004

AbstractArchaeological excavations at the Cooper's Ferry site (10IH73), located in the lower Salmon River canyon of western Idaho, revealed a stratified sequence of cultural occupations that included a pit feature containing stemmed points. However, radiocarbon ages determined on charcoal and bone in the pit feature range between ca. 12,000 yr B.P. and 7300 yr B.P. By considering the effects of postdepositional processes on dated samples, and by comparing the lithostratigraphy, pedostratigraphy, and stable isotope geochemistry of pedogenic carbonates from Cooper's Ferry with other well‐dated stratigraphic sections in the canyon, site geochronology is clarified. Based on the presence of key radiocarbon ages and distinctive stratigraphic criteria, we argue that the initial occupation and interment of lithic artifacts in a pit feature at Cooper's Ferry occurred during the late Pleistocene, between ca. 11,410 and 11,370 yr B.P., and not during the early Holocene. Records of geomorphic change and paleoenvironmental proxy data from the site reveal that early occupation in the lower Salmon River canyon corresponds with evolving riparian ecosystems, which must be considered as a contextual aspect of local prehistoric cultural ecology. © 2004 Wiley Periodicals, Inc.
Effect of prior cognitive state on resting state networks measured with functional connectivity
Authors: Waites Anthony B. , Stanislavsky Alexandra , Abbott David F. , Jackson Graeme D. 
Published: September 2004

AbstractTo address the extent to which functional connectivity measures an absolute brain state, we observed the effect of prior performance of a language task on resting‐state networks in regions associated with language. Six subjects were imaged during rest before and after a block‐design language task. Connectivity maps were generated for each of four language regions (identified from analysis of the language activation portion of the study) in each subject for both rest periods. Conjunction analysis demonstrated distinct networks of voxels for each seed region, indicating separate functional subnetworks associated with the different regions. In a comparison of rest before and after the activation task widespread and significant changes were observed in all individuals, suggesting that the measured resting state network reflects a dynamic image of the current brain state. At the group level, an extended network was observed that was largely persistent over time. Even at the group level an increase in connectivity was observed between left and right middle frontal gyri, and between posterior cingulate cortex and medial frontal cortex in the rest after the language task. These results suggest that functional connectivity may be a powerful measure of cognitive state, sensitive to differences between controls and patients together with the particular cognitive processing occurring during the rest state. Hum. Brain Mapping 24:59–68, 2005. © 2004 Wiley‐Liss, Inc.
Depression, smoking abstinence and HPA function in women smokers
Authors: Pomerleau Ovide F. , Pomerleau Cynthia S. , Snedecor Sandy M. , Gaulrapp Stefanie , Brouwer Rebecca Namenek , Cameron Oliver G. 
Published: September 2004

AbstractTo determine whether smokers with a history of depression are differentially susceptible to smoking withdrawal, depressed mood induction and/or hypothalamic–pituitary–adrenal (HPA) axis dysregulation during smoking abstinence, 24 women smokers with and without such a history were studied. During one 5‐day interval, participants smoked ad libitum; during a second they abstained. On day 4, the participants were exposed to the Velten mood induction procedure (VMIP). Participants were then instructed to take 1 mg dexamethasone at 11 pm. At 4 pm on day 5, blood samples were withdrawn to determine the cortisol and ACTH response. Despite lower baseline cotinine levels, history‐positive participants displayed more pronounced overall withdrawal distress than did history‐negative participants, regardless of condition. The VMIP increased depression as well as negative responses on other profile of mood states subscales. Despite many overall group differences, no significant main effects for smoking condition nor interaction effects emerged. All participants evinced cortisol suppression in response to dexamethasone during both conditions, but the degree of suppression did not differ as a function of either abstinence or depression history. In history‐positive smokers, however, ACTH levels trended toward overall elevation and showed almost no suppression during abstinence; thus exacerbation of HPA dysregulation in history‐positive smokers during smoking abstinence cannot be ruled out. Copyright © 2004 John Wiley & Sons, Ltd.
Effects of a Korean traditional herbal remedy on psychoneuroendocrine responses to examination stress in medical students: a randomized placebo‐controlled trial
Authors: Lee Myeong Soo , Park Ki‐Won , Moon Sun‐Rock 
Published: September 2004

AbstractThe aim of this study was to investigate the efficacy of Ondamtanggamibang, a Korean traditional herbal remedy, as a treatment of stress‐related psychophysiological variables in healthy medical students experiencing examination stress. Forty volunteers were randomly assigned to either an herbal remedy group (n = 20) or a placebo control group (n = 20). After treatment, systolic blood pressure and plasma concentrations of norepinephrine and cortisol concentrations decreased significantly in the herbal remedy group. The herbal remedy group also exhibited beneficial changes in psychological variables such as anxiety, depression, stress and emotional state. These results suggest that a Korean traditional herbal remedy may reduce systolic blood pressure and catecholamine levels, possibly by stabilizing the sympathetic nervous system. This herbal remedy also reduced the negative psychological symptoms, stress and heightened the emotional state experienced by medical students during examinations. Copyright © 2004 John Wiley & Sons, Ltd.