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Nec Research & Development最新文献

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A new method of testing advanced spacecraft pointing control involving flexibility 一种测试先进航天器指向控制灵活性的新方法
Nec Research & Development Pub Date : 1993-07-01 DOI: 10.1016/S1474-6670(17)48868-9
T. Kurii, N. Ogura, T. Yamashita, T. Hashimoto, K. Ninomiya
{"title":"A new method of testing advanced spacecraft pointing control involving flexibility","authors":"T. Kurii, N. Ogura, T. Yamashita, T. Hashimoto, K. Ninomiya","doi":"10.1016/S1474-6670(17)48868-9","DOIUrl":"https://doi.org/10.1016/S1474-6670(17)48868-9","url":null,"abstract":"","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"114 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1993-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121956528","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
DC pumped cyclotron beam tubes using quadrifilar helix. 使用四线螺旋的直流泵浦回旋加速器束管。
Nec Research & Development Pub Date : 1963-12-01 DOI: 10.1007/978-1-349-00447-8_44
Shigebumi Saito, M. Kenmoku, T. Matsuoka
{"title":"DC pumped cyclotron beam tubes using quadrifilar helix.","authors":"Shigebumi Saito, M. Kenmoku, T. Matsuoka","doi":"10.1007/978-1-349-00447-8_44","DOIUrl":"https://doi.org/10.1007/978-1-349-00447-8_44","url":null,"abstract":"","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"183 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115068835","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 2
Gas sorption properties of barium getters for TV picture tubes. 电视显像管用钡吸收剂的气体吸附性能。
Nec Research & Development Pub Date : 1963-04-01 DOI: 10.1016/0042-207x(63)91888-8
H. Kuroda
{"title":"Gas sorption properties of barium getters for TV picture tubes.","authors":"H. Kuroda","doi":"10.1016/0042-207x(63)91888-8","DOIUrl":"https://doi.org/10.1016/0042-207x(63)91888-8","url":null,"abstract":"","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1963-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121260645","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Echo capsule for medical use;a battery-less endoradiosonde. 医疗用回声胶囊;无电池内啡肽探空仪。
Nec Research & Development Pub Date : 1962-07-01 DOI: 10.1109/TBMEL.1962.4322998
J. Nagumo, A. Uchiyama, S. Kimoto, T. Watanuki, M. Hori, Kozo Suma, A. Ouchi, M. Kumano, H. Watanabe
{"title":"Echo capsule for medical use;a battery-less endoradiosonde.","authors":"J. Nagumo, A. Uchiyama, S. Kimoto, T. Watanuki, M. Hori, Kozo Suma, A. Ouchi, M. Kumano, H. Watanabe","doi":"10.1109/TBMEL.1962.4322998","DOIUrl":"https://doi.org/10.1109/TBMEL.1962.4322998","url":null,"abstract":"A new type of a swallowable radio transmitter, ECHO CAPSULE, is described along with some clinical experiments. Unlike other similar capsules which have been reported, this capsule contains no battery and is energized from outside the human body. The energy is converted into dc by the transistor of the oscillator circuit itself, stored into a capacitor and then used as an energy source for the transmission of information on temperature, acidity or the like within the digestive tract.","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1962-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126103648","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 46
Solar batteries for use as the power source of unattended UHF repeaters. 无人值守超高频中继器的电源太阳能电池。
Nec Research & Development Pub Date : 1959-05-01 DOI: 10.1049/PI-B-2.1959.0136
M. Kobayashi
{"title":"Solar batteries for use as the power source of unattended UHF repeaters.","authors":"M. Kobayashi","doi":"10.1049/PI-B-2.1959.0136","DOIUrl":"https://doi.org/10.1049/PI-B-2.1959.0136","url":null,"abstract":"An array of solar batteries for use as the power source of unattended u.h.f. repeaters has recently been established at the top of Mt. Shinobu in Fukushima Prefecture. The equipment consists of two pairs of transmitter-receivers, each of which is partly transistorized. The entire equipment takes approximately 4.5 watts. The silicon solar batteries are used to convert solar energy directly into electrical energy to feed the equipment and simultaneously to charge a set of nickel-cadmium batteries in a floating circuit arrangement as a provision for unfavourable weather. After a series of careful investigations, it became clear that to keep the equipment operating during a long rainy season such as prevails in the Fukushima area, the total capacity of the solar batteries must be designed to be ten times the power actually consumed by the entire equipment. Consequently, the maximum output available from the solar batteries was designed to be about 70 watts. A total of 4320 units were connected to generate 6.5, 60 and 130 volts to supply the transistors, valve heaters and valve anodes respectively. The operating conditions and the reliability of the entire repeater system are discussed in the paper.","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"74 4","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1959-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133107299","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 1
Hidden Markov Model to extract leucine zipper motif 隐马尔可夫模型提取亮氨酸拉链图案
Nec Research & Development Pub Date : 1900-01-01 DOI: 10.11234/GI1990.6.77
Yukiko Fujiwara, M. Asogawa, A. Konagaya
{"title":"Hidden Markov Model to extract leucine zipper motif","authors":"Yukiko Fujiwara, M. Asogawa, A. Konagaya","doi":"10.11234/GI1990.6.77","DOIUrl":"https://doi.org/10.11234/GI1990.6.77","url":null,"abstract":"This paper describes a method to construct a stochastic motif represented by a Hidden Markov Model (HMM), which consists of probabilities representing the amino acid variations and the length flexibility of a motif. To express the stochastic motif with high accuracy, the optimal HMM topology must be obtained according to the motif's characteristic. To obtain the optimal HMM topology from unaligned sequences of a motif, the learning method, named the iterative duplication method, has been developed. It can automatically represent the subfamily branches and the periodic topology for α-helices. In this method, a small fully connected HMM is gradually expanded by splitting appropriate states one by one. The several techniques for splitting state selection are experimented for leucine zipper. The obtained HMMs contain the subfamily branches and the periodic topology relying on necessities. The experimental results show that the HMMs are more powerful than patterns in terms of prediction performance.","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126750281","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 5
A robust stability analysis on learning control for Hard Disk Drives 硬盘学习控制的鲁棒稳定性分析
Nec Research & Development Pub Date : 1900-01-01 DOI: 10.1142/9789812815910_0004
J. Ishikawa, Y. Yanagita, T. Hattori, M. Hashimoto
{"title":"A robust stability analysis on learning control for Hard Disk Drives","authors":"J. Ishikawa, Y. Yanagita, T. Hattori, M. Hashimoto","doi":"10.1142/9789812815910_0004","DOIUrl":"https://doi.org/10.1142/9789812815910_0004","url":null,"abstract":"This paper is concerned with a learning control method to achieve high-speed and highly accurate head positioning for Hard Disk Drives (HDDs) with high areal densities. The learning method improves transitional motion in track seeking and achieves quick settling. From the robust stability analysis of the learning system, the use of a low pass filter to remove high frequency components from the learned feedforward input is also proposed. This provides much higher stability against model uncertainties than that in the original system without a low pass filter. Finally, it has been shown by experiment that the proposed learning algorithm with a low pass filter is able to make seek time distribution small while maintaining stability for HDDs with plant perturbation.","PeriodicalId":103467,"journal":{"name":"Nec Research & Development","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116982813","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 4
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