Based on an available parking space occupancy (APSO) survey conducted in Nanjing, China, an APSO forecasting model is proposed. The APSO survey results indicate that the time series of APSO with different time-secti...Based on an available parking space occupancy (APSO) survey conducted in Nanjing, China, an APSO forecasting model is proposed. The APSO survey results indicate that the time series of APSO with different time-sections are periodical and self-similar, and the fluctuation of the APSO increases with the decrease in time-sections. Taking the short-time change behavior into account, an APSO forecasting model combined wavelet analysis and a weighted Markov chain is presented. In this model, an original APSO time series is first decomposed by wavelet analysis, and the results include low frequency signals representing the basic trends of APSO and several high frequency signals representing disturbances of the APSO. Then different Markov models are used to forecast the changes of low and high frequency signals, respectively. Finally, integrating the predicted results induces the final forecasted APSO. A case study verifies the applicability of the proposed model. The comparisons between measured and forecasted results show that the model is a competent model and its accuracy relies on real-time update of the APSO database.展开更多
Micro-arc oxidation (MAO) process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle ...Micro-arc oxidation (MAO) process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle on the coatings were investigated by orthogonal experiment. It is found that the thickness of coatings increases with the increase of voltage and duty cycle, but decreases with the increase of frequency. The structure and morphology of the coatings also depend on voltage, frequency and duty cycle. The coatings become more porous and crack with increasing voltage and duty cycle. The coating is thin and transparent when the voltage is lower than 120 V. The corrosion resistances of different coatings were evaluated by polarization curves and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl (mass fraction) solution. When the optimized values of voltage, frequency and duty cycle are 140 V, 2 000 Hz and 0.4, respectively, the anodic coating shows the best corrosion resistance.展开更多
A bottleneck automatic identification algorithm based on loop detector data is proposed. The proposed algorithm selects the critical flow rate as the trigger variable of the algorithm which is calculated by the road c...A bottleneck automatic identification algorithm based on loop detector data is proposed. The proposed algorithm selects the critical flow rate as the trigger variable of the algorithm which is calculated by the road conditions the level of service and the proportion of trucks.The process of identification includes two parts. One is to identify the upstream of the bottleneck by comparing the distance between the current occupancy rate and the mean value of the occupancy rate and the variance of the occupancy rate.The other process is to identify the downstream of the bottleneck by calculating the difference of the upstream occupancy rate with that of the downstream.In addition the algorithm evaluation standards which are based on the time interval of the data the detection rate and the false alarm rate are discussed.The proposed algorithm is applied to detect the bottleneck locations in the Shanghai Inner Ring Viaduct Dabaishu-Guangzhong road section.The proposed method has a good performance in improving the accuracy and efficiency of bottleneck identification.展开更多
Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an ...Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an alkaline silicate-containing electrolyte were investigated.The thicknesses of these coatings were obtained by measuring their cross-section using Image J software.Their corrosion resistances were evaluated in HCl and NaCl media through spot test and electrochemical test.The results show that the experimental design of this study is the key to investigate the interactions among these electrical parameters.Additionally,not only each independent factor,but also their interactions exhibit a remarkable influence on the coatings.The combination of high voltage,low frequency and large duty ratio significantly increases the coating thickness and content of the corrosion resistance phase,and thus improves the corrosion resistance of the coating in HNO3 medium.Conversely,the coating possessing the densest microstructure and best corrosion resistance in NaCl medium is obtained when low voltage and high frequency match with a small duty ratio.展开更多
Effects of current density, duty cycle and frequency on microstructure and particles content of electrodeposited Co-BN (hexagonal) nano composite coatings were analyzed by SEM, FESEM, EDS, AFM and XRD techniques. Th...Effects of current density, duty cycle and frequency on microstructure and particles content of electrodeposited Co-BN (hexagonal) nano composite coatings were analyzed by SEM, FESEM, EDS, AFM and XRD techniques. The microhardness, tribological behavior and wear mechanism were also investigated. Generally, as the current density and frequency increased, the particles content and microhardness of the coatings increased firstly and then decreased. Moreover, by reducing duty cycle, more particles were incorporated and higher microhardness was obtained. The best tribological behavior was achieved under the conditions duty cycle of 10%, frequency of 50 Hz and current density of 100 mA/cm2.展开更多
Porter identifies high market share with cost leadership strategy which is based on the idea of competing on a price lower than that of the competition. However, in most consumer markets a business should serve the mi...Porter identifies high market share with cost leadership strategy which is based on the idea of competing on a price lower than that of the competition. However, in most consumer markets a business should serve the middle class by competing in the mid-price segment, offering quality better than that of the competition at a somewhat higher price. It is this path that can lead to market share leadership: a strategy that can be both profitable and sustainable. The U.S. men's shaving cream market consists of two major product-market segments: gel and foam. We test the hypothesis that the best-selling brand is very likely to be a member of the mid-price segment with a price tag that is higher than that of the nearest competition. This study is based on annual U.S. sales data for 2008 and 2007 from discount retail stores, food stores, and drug stores. We performed two separate analyses for 2008 and 2007, using cluster analysis as the main analytic tool. The results were remarkably consistent between the two years. In the gel segment--by far the most important--the price-quality segmentation analysis supported our hypothesis. An interesting finding is that, for both the gel and foam segments, we found the rank order correlation of brand unit price between 2007 and 2008 as highly significant. This means that in this market management considers the price of a brand as a strategic rather than a tactical variable. Although, technically the results for the foam segment were negative, this does not necessarily contradict our hypothesis. Finally, we discovered six strategic groups in the industry and have tried to articulate what their competitive strategy is.展开更多
Public companies issue periodic annual reports to give information about the past financial and operational results while presenting the future strategies. Companies release non-financial information concerned with co...Public companies issue periodic annual reports to give information about the past financial and operational results while presenting the future strategies. Companies release non-financial information concerned with corporate sustainability issues like market share, customer loyalty, supply chain management, corporate governance, and human resources in annual reports as well as the audited financial reports. Annual reports, one of the important instruments of transparency and disclosure, are widely used by shareholders and stakeholders. Recent laws and regulations in the US, European Union, and Turkey require enhanced disclosures in annual reports. In the first part of this study, a comparative regulatory framework for annual reports will be established under the Sarbanes Oxley Act (SOX), the Securities and Exchange Commission (SEC) filing requirements, the New Turkish Commercial Code, and regulations of Capital Markets Board (CMB) of Turkey. In the second part of this study, annual reports of four sample companies listed in the New York Stock Exchange (NYSE) and Corporate Governance Index of Borsa Istanbul will be discussed in the light of disclosure requirements of Form 20-F. Findings of this study support the hypothesis which states that regulatory environment has a positive impact on the quantity and quality of disclosures. Attention is drawn to the need for global standardization to reduce the reporting variances and the need for independent audit of annual reports to increase the reliability.展开更多
This paper was devoted to analyzing the structure of microfinance in Thailand. The theory of industrial organization (IO) was applied as a guideline to measure the degree of monopoly power in microfinance structure....This paper was devoted to analyzing the structure of microfinance in Thailand. The theory of industrial organization (IO) was applied as a guideline to measure the degree of monopoly power in microfinance structure. The objective-of the study was investigation on Thai microfinance institution marketing structure by using Concentration Ratio (CR) and Herfindahl Hirschman Index (HHI). The data of the study focus on the outstanding loans market share of microfinance institutions (MFIs). The market share of the outstanding loans of MFIs from the largest to the smallest is as follows: Bank for Agriculture and Agricultural Cooperatives (BAAC), Village Fund Cooperatives, Government Saving Bank (GSB), Pawnshop, Self Help group: Saving Group, Commercial Bank, Self Help Group: Sudja Group and Isalamic Bank (IB), respectively. It stated that CR by outstanding loans is as follows: Cr 1, 59.35%; Cr 3, 81.11%; Cr 6, 92.14%; and Cr 9, 94.37%. At the same time HHI is 0.38. Additionally, BAAC remains the majority MFIs even though there are the other MFIs available in the microfinance system. The main role of providing the microfinance services mostly derived from BAAC.展开更多
The main objective of this study is to analyze through tripod strategy Peng, the basics of why the acquisition and sale of Grupo Modelo (which it is the largest brewer in Mexico with the highest market share) throug...The main objective of this study is to analyze through tripod strategy Peng, the basics of why the acquisition and sale of Grupo Modelo (which it is the largest brewer in Mexico with the highest market share) through analysis of the annual reports of the company. The analysis will be supported under three main theories: theory of industry, theory of resources and capabilities, and ultimately theory of institutions. The paper concludes with a compilation and analysis of information giving rise to answer the question why 6rupo Modelo sold? And if have you had a positive result in the acquisition of Grupo Modelo by the company ABI? The answer is yes. The sale price of the shares by Grupo Modelo was very high and it received an award of 30% over the closing price of the shares of the C series in 2012. So it was a good sale regarding previous observations.展开更多
Prior studies commonly use an auditor's market share in an industry as a proxy for auditor industry expertise and find that audit quality is positively related to an audit partner's within-industry market share in a...Prior studies commonly use an auditor's market share in an industry as a proxy for auditor industry expertise and find that audit quality is positively related to an audit partner's within-industry market share in a voluntary audit partner rotation regime where the length of the client-partner relationship is not limited. Mandatory audit partner rotation, however, limits the length of the client-partner relationship and can artificially increase or decrease the market shares of incoming and departing partners, thus making the audit partner's within-industry market share an unreliable proxy for auditor industry expertise. Using a sample of banks in Taiwan, we find that audit quality is positively related to an audit partner's within-industry market share in the voluntary audit partner rotation regime. However, such a positive relation disappears in the mandatory audit partner rotation regime. Thus, we conclude that mandatory audit partner rotation decouples the link between an audit partner's within-industry market share and auditor industry expertise and caution researchers against using an audit partner's within-industry market share as a proxy for auditor industry expertise in a mandatory audit partner rotation regime.展开更多
An approach for the economic analysis of chemical product design is proposed. It takes into account of customers' preference on product quality and economic considerations such as pricing, profit, market share, ca...An approach for the economic analysis of chemical product design is proposed. It takes into account of customers' preference on product quality and economic considerations such as pricing, profit, market share, capital investment, and operating cost. The activities needed to support business decision making – identifying product quality, estimating product cost, calculating financial metrics, and performing make–buy analysis – are discussed.The design of a Ganoderma lucidum dietary supplement, a traditional Chinese medicinal(TCM) product, is used to illustrate all the activities in this approach.展开更多
After years of development, has emerged a group of outstanding enterprises in Guangxi, creating a high popularity and good reputation of the product. But from 2013 data can be seen in the study of traditional Chinese ...After years of development, has emerged a group of outstanding enterprises in Guangxi, creating a high popularity and good reputation of the product. But from 2013 data can be seen in the study of traditional Chinese medicine industry of China, Guangxi traditional Chinese medicine products in the market space is still limited in the province, the market share of the market at a relatively low level in the country. This is from a macro-perspective analysis of the national sales on traditional Chinese medicine of Guangxi Chinese medicine industry development in present situation and makes problem-oriented industrial policy advice to counter.展开更多
In cognitive radio network(CRN), a secondary user(SU) may utilize the spectrum resource of the primary user(PU) and avoid causing harmful interference to the primary network(PN) via spectrum sensing. In the traditiona...In cognitive radio network(CRN), a secondary user(SU) may utilize the spectrum resource of the primary user(PU) and avoid causing harmful interference to the primary network(PN) via spectrum sensing. In the traditional time spectrum sensing, the SU cannot detect the PU's presence during its transmission, thus increasing interference to the PN. In this work, a novel weighed cooperative bandwidth spectrum sensing method is proposed, which allows multiple SUs to use part of the bandwidth to perform cooperative spectrum sensing throughout the whole frame in order to detect the PU's reappearance in time. The SU's spectrum efficiency is maximized by jointly optimizing sensing bandwidth proportion, number of cooperative SUs and detection probability, subject to the constraints on the SU's interference and the false alarm probability. Simulation results show significant decrease on the interference and improvement on the spectrum efficiency using the proposed weighed cooperative bandwidth spectrum sensing method.展开更多
In low-duty-cycle wireless sensor networks,designers have to cope with unreliable links and limited communication capacity.In this work,we propose COST,a coding scheme that leverages spatial-temporal diversity to achi...In low-duty-cycle wireless sensor networks,designers have to cope with unreliable links and limited communication capacity.In this work,we propose COST,a coding scheme that leverages spatial-temporal diversity to achieve higher energy efficiency and lower delay of packet transmissions.We particularly address long sleeping intervals in low-duty-cycle networks by exploiting multi-path diversity.Specifically,we propose to employ an erasure-coding scheme to improve reliability.With respect to energy efficiency and delivery timeliness,we formulate the problem in optimal allocation of coded blocks over multiple paths,which is then proved to be NP-hard.We further propose a near-optimal algorithm to solve the allocation problem.Through extensive simulations,we evaluate the impact of network parameters and demonstrate the effectiveness of our proposal.展开更多
Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards(Panthera uncia) in the Yanchiwan National Nature Reserve,Gansu Province,China,...Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards(Panthera uncia) in the Yanchiwan National Nature Reserve,Gansu Province,China,to assess species richness with respect to mammal and birds species. We also assessed survey efficiency for species detection,and conducted an initial analysis of species interactions. The survey effort of 10,171 camera workdays yielded 2,868 suitable animal image events involving 17 mammal and 20 bird species. Among these,the dhole(Cuon alpinus) is considered to be Endangered,the snow leopard and white-lipped deer(Cervus albirostris) Vulnerable,and the Pallas' s cat(Feli smanul),mountain weasel(Mustela altaica),Himalayan griffon(Gyps himalayensis) and cinereous vulture(Aegypius monachus) Near Threatened under the IUCN red list. Fourteen species were also listed as key protected wild animals according to China national standards. Both the rarefaction curves and richness estimators suggested our sampling for mammal and pheasant species is sufficient,while more survey efforts are still needed to detect other bird species. With a focus on the dominant species Eurasian lynx(Lynx lynx),occupancy models were used to estimate site use and detection probability for selected species,and to investigate predator-prey relationships between lynx on the one hand and woolly hare(Lepus oiostolus),pika(Ochotona spp.)and Tibetan partridge(Perdix hodgsoniae) on the other. We give recommendations on how to increase efficiency in camera-based species inventory and biodiversity monitoring.展开更多
基金The National Natural Science Foundation of China(No50738001)the National Basic Research Program of China (973Program) (No2006CB705501)
文摘Based on an available parking space occupancy (APSO) survey conducted in Nanjing, China, an APSO forecasting model is proposed. The APSO survey results indicate that the time series of APSO with different time-sections are periodical and self-similar, and the fluctuation of the APSO increases with the decrease in time-sections. Taking the short-time change behavior into account, an APSO forecasting model combined wavelet analysis and a weighted Markov chain is presented. In this model, an original APSO time series is first decomposed by wavelet analysis, and the results include low frequency signals representing the basic trends of APSO and several high frequency signals representing disturbances of the APSO. Then different Markov models are used to forecast the changes of low and high frequency signals, respectively. Finally, integrating the predicted results induces the final forecasted APSO. A case study verifies the applicability of the proposed model. The comparisons between measured and forecasted results show that the model is a competent model and its accuracy relies on real-time update of the APSO database.
基金Project (50801056) supported by the National Natural Science Foundation of ChinaProject (2005DKA10400-Z20) supported by the National R&D Infrastructure and Facility Development Program of ChinaProject supported by the Zijin Project of Zhejiang University, China
文摘Micro-arc oxidation (MAO) process was carried out on AZ91D alloy in alkaline borate solution using an alternative square-wave power source with different parameters. The effects of voltage, frequency and duty cycle on the coatings were investigated by orthogonal experiment. It is found that the thickness of coatings increases with the increase of voltage and duty cycle, but decreases with the increase of frequency. The structure and morphology of the coatings also depend on voltage, frequency and duty cycle. The coatings become more porous and crack with increasing voltage and duty cycle. The coating is thin and transparent when the voltage is lower than 120 V. The corrosion resistances of different coatings were evaluated by polarization curves and electrochemical impedance spectroscopy (EIS) in 3.5% NaCl (mass fraction) solution. When the optimized values of voltage, frequency and duty cycle are 140 V, 2 000 Hz and 0.4, respectively, the anodic coating shows the best corrosion resistance.
文摘A bottleneck automatic identification algorithm based on loop detector data is proposed. The proposed algorithm selects the critical flow rate as the trigger variable of the algorithm which is calculated by the road conditions the level of service and the proportion of trucks.The process of identification includes two parts. One is to identify the upstream of the bottleneck by comparing the distance between the current occupancy rate and the mean value of the occupancy rate and the variance of the occupancy rate.The other process is to identify the downstream of the bottleneck by calculating the difference of the upstream occupancy rate with that of the downstream.In addition the algorithm evaluation standards which are based on the time interval of the data the detection rate and the false alarm rate are discussed.The proposed algorithm is applied to detect the bottleneck locations in the Shanghai Inner Ring Viaduct Dabaishu-Guangzhong road section.The proposed method has a good performance in improving the accuracy and efficiency of bottleneck identification.
基金Project(1111RJDA011)supported by the Creative Research Group Fund of Gansu Province,ChinaProject(SKLAB02015006)supported by the State Key Laboratory Open Fund of Advanced Processing and Recycling of Nonferrous Metals,China。
文摘Based on orthogonal experiments,the effects of voltage,frequency,duty ratio and their interactions on the thickness and corrosion resistance of coatings prepared by plasma electrolytic oxidation(PEO)on aluminum in an alkaline silicate-containing electrolyte were investigated.The thicknesses of these coatings were obtained by measuring their cross-section using Image J software.Their corrosion resistances were evaluated in HCl and NaCl media through spot test and electrochemical test.The results show that the experimental design of this study is the key to investigate the interactions among these electrical parameters.Additionally,not only each independent factor,but also their interactions exhibit a remarkable influence on the coatings.The combination of high voltage,low frequency and large duty ratio significantly increases the coating thickness and content of the corrosion resistance phase,and thus improves the corrosion resistance of the coating in HNO3 medium.Conversely,the coating possessing the densest microstructure and best corrosion resistance in NaCl medium is obtained when low voltage and high frequency match with a small duty ratio.
文摘Effects of current density, duty cycle and frequency on microstructure and particles content of electrodeposited Co-BN (hexagonal) nano composite coatings were analyzed by SEM, FESEM, EDS, AFM and XRD techniques. The microhardness, tribological behavior and wear mechanism were also investigated. Generally, as the current density and frequency increased, the particles content and microhardness of the coatings increased firstly and then decreased. Moreover, by reducing duty cycle, more particles were incorporated and higher microhardness was obtained. The best tribological behavior was achieved under the conditions duty cycle of 10%, frequency of 50 Hz and current density of 100 mA/cm2.
文摘Porter identifies high market share with cost leadership strategy which is based on the idea of competing on a price lower than that of the competition. However, in most consumer markets a business should serve the middle class by competing in the mid-price segment, offering quality better than that of the competition at a somewhat higher price. It is this path that can lead to market share leadership: a strategy that can be both profitable and sustainable. The U.S. men's shaving cream market consists of two major product-market segments: gel and foam. We test the hypothesis that the best-selling brand is very likely to be a member of the mid-price segment with a price tag that is higher than that of the nearest competition. This study is based on annual U.S. sales data for 2008 and 2007 from discount retail stores, food stores, and drug stores. We performed two separate analyses for 2008 and 2007, using cluster analysis as the main analytic tool. The results were remarkably consistent between the two years. In the gel segment--by far the most important--the price-quality segmentation analysis supported our hypothesis. An interesting finding is that, for both the gel and foam segments, we found the rank order correlation of brand unit price between 2007 and 2008 as highly significant. This means that in this market management considers the price of a brand as a strategic rather than a tactical variable. Although, technically the results for the foam segment were negative, this does not necessarily contradict our hypothesis. Finally, we discovered six strategic groups in the industry and have tried to articulate what their competitive strategy is.
文摘Public companies issue periodic annual reports to give information about the past financial and operational results while presenting the future strategies. Companies release non-financial information concerned with corporate sustainability issues like market share, customer loyalty, supply chain management, corporate governance, and human resources in annual reports as well as the audited financial reports. Annual reports, one of the important instruments of transparency and disclosure, are widely used by shareholders and stakeholders. Recent laws and regulations in the US, European Union, and Turkey require enhanced disclosures in annual reports. In the first part of this study, a comparative regulatory framework for annual reports will be established under the Sarbanes Oxley Act (SOX), the Securities and Exchange Commission (SEC) filing requirements, the New Turkish Commercial Code, and regulations of Capital Markets Board (CMB) of Turkey. In the second part of this study, annual reports of four sample companies listed in the New York Stock Exchange (NYSE) and Corporate Governance Index of Borsa Istanbul will be discussed in the light of disclosure requirements of Form 20-F. Findings of this study support the hypothesis which states that regulatory environment has a positive impact on the quantity and quality of disclosures. Attention is drawn to the need for global standardization to reduce the reporting variances and the need for independent audit of annual reports to increase the reliability.
文摘This paper was devoted to analyzing the structure of microfinance in Thailand. The theory of industrial organization (IO) was applied as a guideline to measure the degree of monopoly power in microfinance structure. The objective-of the study was investigation on Thai microfinance institution marketing structure by using Concentration Ratio (CR) and Herfindahl Hirschman Index (HHI). The data of the study focus on the outstanding loans market share of microfinance institutions (MFIs). The market share of the outstanding loans of MFIs from the largest to the smallest is as follows: Bank for Agriculture and Agricultural Cooperatives (BAAC), Village Fund Cooperatives, Government Saving Bank (GSB), Pawnshop, Self Help group: Saving Group, Commercial Bank, Self Help Group: Sudja Group and Isalamic Bank (IB), respectively. It stated that CR by outstanding loans is as follows: Cr 1, 59.35%; Cr 3, 81.11%; Cr 6, 92.14%; and Cr 9, 94.37%. At the same time HHI is 0.38. Additionally, BAAC remains the majority MFIs even though there are the other MFIs available in the microfinance system. The main role of providing the microfinance services mostly derived from BAAC.
文摘The main objective of this study is to analyze through tripod strategy Peng, the basics of why the acquisition and sale of Grupo Modelo (which it is the largest brewer in Mexico with the highest market share) through analysis of the annual reports of the company. The analysis will be supported under three main theories: theory of industry, theory of resources and capabilities, and ultimately theory of institutions. The paper concludes with a compilation and analysis of information giving rise to answer the question why 6rupo Modelo sold? And if have you had a positive result in the acquisition of Grupo Modelo by the company ABI? The answer is yes. The sale price of the shares by Grupo Modelo was very high and it received an award of 30% over the closing price of the shares of the C series in 2012. So it was a good sale regarding previous observations.
文摘Prior studies commonly use an auditor's market share in an industry as a proxy for auditor industry expertise and find that audit quality is positively related to an audit partner's within-industry market share in a voluntary audit partner rotation regime where the length of the client-partner relationship is not limited. Mandatory audit partner rotation, however, limits the length of the client-partner relationship and can artificially increase or decrease the market shares of incoming and departing partners, thus making the audit partner's within-industry market share an unreliable proxy for auditor industry expertise. Using a sample of banks in Taiwan, we find that audit quality is positively related to an audit partner's within-industry market share in the voluntary audit partner rotation regime. However, such a positive relation disappears in the mandatory audit partner rotation regime. Thus, we conclude that mandatory audit partner rotation decouples the link between an audit partner's within-industry market share and auditor industry expertise and caution researchers against using an audit partner's within-industry market share as a proxy for auditor industry expertise in a mandatory audit partner rotation regime.
文摘An approach for the economic analysis of chemical product design is proposed. It takes into account of customers' preference on product quality and economic considerations such as pricing, profit, market share, capital investment, and operating cost. The activities needed to support business decision making – identifying product quality, estimating product cost, calculating financial metrics, and performing make–buy analysis – are discussed.The design of a Ganoderma lucidum dietary supplement, a traditional Chinese medicinal(TCM) product, is used to illustrate all the activities in this approach.
文摘After years of development, has emerged a group of outstanding enterprises in Guangxi, creating a high popularity and good reputation of the product. But from 2013 data can be seen in the study of traditional Chinese medicine industry of China, Guangxi traditional Chinese medicine products in the market space is still limited in the province, the market share of the market at a relatively low level in the country. This is from a macro-perspective analysis of the national sales on traditional Chinese medicine of Guangxi Chinese medicine industry development in present situation and makes problem-oriented industrial policy advice to counter.
基金Project(61471194)supported by the National Natural Science Foundation of ChinaProject(BK20140828)supported by the Natural Science Foundation of Jiangsu Province,ChinaProjects(NS2015088,DUT16RC(3)045)supported by the Fundamental Research Funds for the Central Universities,China
文摘In cognitive radio network(CRN), a secondary user(SU) may utilize the spectrum resource of the primary user(PU) and avoid causing harmful interference to the primary network(PN) via spectrum sensing. In the traditional time spectrum sensing, the SU cannot detect the PU's presence during its transmission, thus increasing interference to the PN. In this work, a novel weighed cooperative bandwidth spectrum sensing method is proposed, which allows multiple SUs to use part of the bandwidth to perform cooperative spectrum sensing throughout the whole frame in order to detect the PU's reappearance in time. The SU's spectrum efficiency is maximized by jointly optimizing sensing bandwidth proportion, number of cooperative SUs and detection probability, subject to the constraints on the SU's interference and the false alarm probability. Simulation results show significant decrease on the interference and improvement on the spectrum efficiency using the proposed weighed cooperative bandwidth spectrum sensing method.
基金This work was supported in part by the National Basic Research Program of China(Grant No.2011CB302705)the National Natural Science Foundation of China(GrantNos.61003277,60903206)+1 种基金the State key DevelopmentProgram for Basic Research of China(No.2009CB3020402)the National Natural Science Foun-dation of Jiangsu Province(Grant No.BK2010102)
文摘In low-duty-cycle wireless sensor networks,designers have to cope with unreliable links and limited communication capacity.In this work,we propose COST,a coding scheme that leverages spatial-temporal diversity to achieve higher energy efficiency and lower delay of packet transmissions.We particularly address long sleeping intervals in low-duty-cycle networks by exploiting multi-path diversity.Specifically,we propose to employ an erasure-coding scheme to improve reliability.With respect to energy efficiency and delivery timeliness,we formulate the problem in optimal allocation of coded blocks over multiple paths,which is then proved to be NP-hard.We further propose a near-optimal algorithm to solve the allocation problem.Through extensive simulations,we evaluate the impact of network parameters and demonstrate the effectiveness of our proposal.
基金National Natural Science Foundation of China(31470567)
文摘Camera traps serve as an important tool for monitoring species diversity. We used data from camera traps set for capturing snow leopards(Panthera uncia) in the Yanchiwan National Nature Reserve,Gansu Province,China,to assess species richness with respect to mammal and birds species. We also assessed survey efficiency for species detection,and conducted an initial analysis of species interactions. The survey effort of 10,171 camera workdays yielded 2,868 suitable animal image events involving 17 mammal and 20 bird species. Among these,the dhole(Cuon alpinus) is considered to be Endangered,the snow leopard and white-lipped deer(Cervus albirostris) Vulnerable,and the Pallas' s cat(Feli smanul),mountain weasel(Mustela altaica),Himalayan griffon(Gyps himalayensis) and cinereous vulture(Aegypius monachus) Near Threatened under the IUCN red list. Fourteen species were also listed as key protected wild animals according to China national standards. Both the rarefaction curves and richness estimators suggested our sampling for mammal and pheasant species is sufficient,while more survey efforts are still needed to detect other bird species. With a focus on the dominant species Eurasian lynx(Lynx lynx),occupancy models were used to estimate site use and detection probability for selected species,and to investigate predator-prey relationships between lynx on the one hand and woolly hare(Lepus oiostolus),pika(Ochotona spp.)and Tibetan partridge(Perdix hodgsoniae) on the other. We give recommendations on how to increase efficiency in camera-based species inventory and biodiversity monitoring.