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Search Results: 1 - 10 of 97733 matches for " Shi Chen "
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Re-Parameterization the Logistic Model in Assessing Changes in the Baroreceptor Reflex  [PDF]
Shande Chen, Xiangrong Shi
Neuroscience & Medicine (NM) , 2011, DOI: 10.4236/nm.2011.22016
Abstract: The logistic model is frequently used to describe the nonlinear relationship between systemic arterial pressure (SAP) and carotid sinus pressure (CSP). In this paper, we propose using maximum gain and saturation as parameters in the logistic model. By this method, the estimates and standard errors together with confidence intervals for maximum gain and saturation are direct outputs from the curve fitting, which also makes it easy to perform various hypotheses testing on these quantities. The method is illustrated by real life data from a study on the carotid baroreflex function during infusion of sodium nitroprusside, in which seven healthy, young men who were clinically proved to be free from any disease were studied. Their heart rate, arterial blood pressure and central venous pressure were measured. Neck pressure and neck suction protocol was carried out to selectively elicit changes in CSP and the responsiveness of SAP. Data were analyzed and compare before and after nitroprusside infusion. Our results showed that nitroprusside significantly decreased arterial blood pressure and central venous pressure, and significantly increased heart rate, and significantly augmented maximum gain of the carotid baroreflex function.
A Method for Calculating the Association Degrees between Concepts of Concept Networks  [PDF]
Shi-Jay Chen
Journal of Computer and Communications (JCC) , 2018, DOI: 10.4236/jcc.2018.65005
Abstract: Depicting the associating degrees between two concepts and their relationships are major works for constructing a multi-relationship fuzzy concept network. This paper indicates some drawbacks of the existing methods of calculating associating degrees between concepts, and proposes a new method for overcoming these drawbacks. We also use some examples to compare the proposed method with the existing methods for calculating the associating degrees between two concepts in a multi-relationship fuzzy concept networks.
Analysis on China’s Low Household Consumption
Canadian Social Science , 2011,
Abstract: Since the economic reform of China in the late 70s, China is going through a rapid economic development, however, the proportion of consumption in the national economy is declining over the past 30 years. In this paper, we first describe the current facts of China’s falling consumption rate. Then we propose the factors that lead to this decline and divide them to two categories. One category consists of structural factors, which corresponds to the declining proportion of the disposable income in GDP. The other category consists of behavior factors, and they describe how much the consumption rate is affected by consumer behavior. The research proposed in this paper is based on fundamental statistical data, using time series analysis on Chinese economy as well as international and inter-provincial panel-data analysis. To study on this problem, our research is comprised of two steps. In the first step, we focus on the change of China’s disposable income per GDP. In the second step, we study on the change of household consumption as percentage of disposable income. Key words: Consumption Rate; Economic Structure; National Income Distribution Résumé: Depuis la réforme économique à la fin des années 70, la Chine est en train de connaitre un développement économique rapide, cependant, la proportion de la consommation dans l'économie nationale est en déclin au cours des 30 dernières années. Dans cet article, nous décrivons d'abord les circonstances actuelles de la baisse du taux de la consommation de la Chine. Nous exposons ensuite des facteurs qui conduisent à ce déclin et les divisons en deux catégories. Une catégorie se compose des facteurs structurels, ce qui correspond à la proportion décroissante du revenu disponible dans le PIB. L'autre catégorie comprend des facteurs de comportement, et ils décrivent à quel point le taux de consommation est affecté par le comportement des consommateurs. La recherche proposée dans le présent article est basée sur des données statistiques fondamentales, en utilisant l'analyse des séries chronologiques sur l'économie chinoise et l’analyse des données de panel internationales et inter-provinciales. Afin d’étudier ce problème, notre recherche est composée de deux étapes. Dans la première étape, nous nous concentrons sur le changement du revenu disponible par unité de PIB de la Chine. Dans la deuxième étape, nous étudions le changement de la consommation des ménages en pourcentage du revenu disponible. Mots clés: Taux de consommation; Structure économique; Distribution du revenu national
Hilbert Huang Transform for Predicting Proteins Subcellular Location  [PDF]
Feng SHI, Qiujian CHEN, Nana LI
Journal of Biomedical Science and Engineering (JBiSE) , 2008, DOI: 10.4236/jbise.2008.11009
Abstract: Apoptosis proteins have a central role in the development and homeostasis of an organism. These proteins are very important for the understanding the mechanism of programmed cell death, and their function is related to their types. The apoptosis proteins are categorized into the following four types: (1) Cytoplasmic protein; (2) Plasma membrane-bound protein; (3) Mitochondrial inner and outer proteins; (4) Other proteins. A novel method, the Hilbert-Huang transform, is applied for predicting the type of a given apoptosis protein with support vector machine. High success rates were obtained by the re-substitute test (98/98=100%), jackknife test (91/98 = 92.9%).
Development of Deep-Sea Resonant Sandwich Linear Ultrasonic Motor  [PDF]
Shaopeng He, Shengjun Shi, Weishan Chen
Journal of Applied Mathematics and Physics (JAMP) , 2018, DOI: 10.4236/jamp.2018.61028
A deep-sea resonant sandwich linear ultrasonic motor is proposed and designed. We determine the parameter of its structure by finite-element analysis. The piezoelectric actuator adopts compound vibration mode of fifth order bending vibration and second order longitudinal. The mode degeneracy of that is completed. We manufacture the prototype to measure the performance of it. We measure its vibration mode and resonant frequency. The velocity of prototype can reach 264.5 mm/s while the water pressure is 8 MPa and the voltage signal with frequency of 30.30 kHz and voltage amplitude of 150 V.
Stage-Structured Impulsive Model for Pest Management
Ruiqing Shi,Lansun Chen
Discrete Dynamics in Nature and Society , 2007, DOI: 10.1155/2007/97608
Abstract: An SI epidemic model with stage structure is investigated. In the model, impulsive biological control is taken, that is, we release infected pests to the field at a fixed time periodically. We get a sufficient condition for the global asymptotical stability of the pest-eradication periodic solution (0,0,I?(t)), and a condition for the permanence of the system. At last, a brief discussion shows that our results will be helpful for pest management.
2-Norm-Based Iterative Design of Filterbank Transceivers: A Control Perspective
Yang Shi,Tongwen Chen
Journal of Control Science and Engineering , 2008, DOI: 10.1155/2008/143085
Abstract: This paper considers design of filterbank-based transceivers. A composite error criterion is proposed to capture all the three traditional distortions. Incorporating noise attenuation and filter bandlimiting properties into this error criterion, an optimal design procedure is developed and applied to a transceiver design example, yielding an FIR transceiver that has good frequency-selective properties and is close to perfect reconstruction. As a least-squares solution is given in closed form in each iteration, the algorithm is easy to implement.
Fluorescence Detection and Discrimination of ss- and ds-DNA with a Water Soluble Oligopyrene Derivative
Youqiang Chen,Gaoquan Shi
Sensors , 2009, DOI: 10.3390/s90604164
Abstract: A novel water-soluble cationic conjugated oligopyrene derivative, oligo(N1,N1,N1,N4,N4,N4-hexamethyl-2-(4-(pyren-1-yl) butane-1,4-diaminium bromide) (OHPBDB), was synthesized by a combination of chemical and electrochemical synthesis techniques. Each oligomer chain has five pyrene derivative repeating units and brings 10 positive charges. OHPBDB showed high and rapid fluorescence quenching in aqueous media upon addition of trace amounts of single-stranded (ss) and double-stranded (ds) DNA. The Stern-Volmer constants for ss- and ds-DNA were measured to be as high as 1.3 × 108 mol-1·L and 1.2 × 108 mol-1·L, respectively. On the other hand, distinct fluorescence enhancement of OHPBDB upon addition of large amount of ss-DNA or ds-DNA was observed. Furthermore, ss-DNA showed much stronger fluorescence enhancement than that of ds-DNA, thus yielding a clear and simple signal useful for the discrimination between ss- and ds-DNA in aqueous media.
Next-generation sequencing technologies for personalized medicine: promising but challenging
Geng Chen,TieLiu Shi
Science China Life Sciences , 2013, DOI: 10.1007/s11427-013-4436-x
Annual precipitation fields secular variation over global land areas for 1948–2000
Neng Shi,Luweng Chen
Chinese Science Bulletin , 2003, DOI: 10.1007/BF03183299
Abstract: The secular variation over the global land annual precipitation (GLAP) fields for 1948–2000 is investigated. Evidence suggests that the GLAP abruptly reduced around 1978 and experienced a decrease of 0.54 mm/a, on average. Fuzzy clustering is used to group the annual precipitation over commonly-used 36 latitudes belts into six belts for examining its secular variation. The results show that, except northern high-latitudes (60°–90° N) where it is slightly increased, the precipitation is decreased, especially in 35° N–35° S, and the diminution is the maximum of 0.98 mm/a at tropics. Moreover, identification of 1948–2000 flood/drought years on a global basis is made, showing noticeable interdecadal variations. During the years of warm (cold) events the precipitation decreases (increases) by 15.4 mm (14.4 mm) per year, on average. It can be assumed that global warming and frequent ENSO occurrences from the end of the 1970s maybe serve as the root cause of the diminution.
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