Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412525
D. Mehdi, S. Lassâad
the present work is a contribution to improve efficiency and the robustness of a indirect field oriented of induction motor drives. The efficiency of the motor deteriorates for two reasons: The variation of rotor resistance and operation under light loads, with a constant field. For these reasons, a method is proposed to choose the optimal field to minimize total machine losses. On the other hand, to avoid the problem of rotor resistance variation, a mechanism based on the fuzzy logic is proposed to maintain the decoupling and avoid supplementary losses. An extensive simulation works yields to selected results to highlight the efficiency of proposed methods.
{"title":"Losses minimisation in an induction motor","authors":"D. Mehdi, S. Lassâad","doi":"10.1109/ICSCS.2009.5412525","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412525","url":null,"abstract":"the present work is a contribution to improve efficiency and the robustness of a indirect field oriented of induction motor drives. The efficiency of the motor deteriorates for two reasons: The variation of rotor resistance and operation under light loads, with a constant field. For these reasons, a method is proposed to choose the optimal field to minimize total machine losses. On the other hand, to avoid the problem of rotor resistance variation, a mechanism based on the fuzzy logic is proposed to maintain the decoupling and avoid supplementary losses. An extensive simulation works yields to selected results to highlight the efficiency of proposed methods.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"40 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124184684","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412685
Hichem Besbes, S. Najeh, A. Jdidi, S. Smirani
In this paper, we propose a simple proportional fairness resource allocation technique for downlink OFDMA system, by re-arranging the set of users into four classes and setting different priority order. The classes are obtained according to buffers states and channels conditions. We offer priority to users having a delay sensitive traffic by considering those who have the fullest buffer and good channel conditions. Moreover, we propose to use the superposition coding technique to increase the system capacity. In fact, we will allow a degraded user (having bad channel condition) and a potential user (having good channel condition) to share the same subcarrier. At the degraded user side, the receiver will proceed as usual and will consider the information sent to the potential user as an additive noise. At the potential user side, a successive decoding process will be adopted. To avoid error propagation, which can occur in this case, the amount of transmitted power to each user will be optimized accordingly. A suboptimal resource allocation algorithm, based on the mentioned superposition scheme and users classification, is derived. Simulation results confirm that the proposed technique offers a proportional fairness allocation and outperforms the classical algorithms in terms of total throughput.
{"title":"Resource allocation algorithm in downlink of OFDMA systems based on users' classification and superposition coding","authors":"Hichem Besbes, S. Najeh, A. Jdidi, S. Smirani","doi":"10.1109/ICSCS.2009.5412685","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412685","url":null,"abstract":"In this paper, we propose a simple proportional fairness resource allocation technique for downlink OFDMA system, by re-arranging the set of users into four classes and setting different priority order. The classes are obtained according to buffers states and channels conditions. We offer priority to users having a delay sensitive traffic by considering those who have the fullest buffer and good channel conditions. Moreover, we propose to use the superposition coding technique to increase the system capacity. In fact, we will allow a degraded user (having bad channel condition) and a potential user (having good channel condition) to share the same subcarrier. At the degraded user side, the receiver will proceed as usual and will consider the information sent to the potential user as an additive noise. At the potential user side, a successive decoding process will be adopted. To avoid error propagation, which can occur in this case, the amount of transmitted power to each user will be optimized accordingly. A suboptimal resource allocation algorithm, based on the mentioned superposition scheme and users classification, is derived. Simulation results confirm that the proposed technique offers a proportional fairness allocation and outperforms the classical algorithms in terms of total throughput.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"118 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129994849","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412586
C. Lazzari, P. Flores, J. Monteiro
Interconnections play a crucial role in todays deep sub-micron designs because they dominate the delay, power and area. This is especially critical for modern million-gates FPGAs, where as much as 90% of chip area is devoted to interconnections. Multiple-valued logic allows for the reduction of the required number of signals in the circuit, hence can serve as a means to effectively curtail the impact of interconnections. We present in this paper a comparison of binary and quaternary implementations of arithmetic modules based on lookup table structures using a voltage-mode circuits. Our assessment demonstrates that significant a power reduction is possible through the use of quaternary structures, with very low delay penalties.
{"title":"Power and delay comparison of binary and quaternary arithmetic circuits","authors":"C. Lazzari, P. Flores, J. Monteiro","doi":"10.1109/ICSCS.2009.5412586","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412586","url":null,"abstract":"Interconnections play a crucial role in todays deep sub-micron designs because they dominate the delay, power and area. This is especially critical for modern million-gates FPGAs, where as much as 90% of chip area is devoted to interconnections. Multiple-valued logic allows for the reduction of the required number of signals in the circuit, hence can serve as a means to effectively curtail the impact of interconnections. We present in this paper a comparison of binary and quaternary implementations of arithmetic modules based on lookup table structures using a voltage-mode circuits. Our assessment demonstrates that significant a power reduction is possible through the use of quaternary structures, with very low delay penalties.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129996428","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412609
E. Ben Salem, Hichem Besbes, S. Cherif, Roberto López-Valcarce
In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is compared to existing blind algorithms in terms of data bit rate. The simulation results are studied in the context of ADSL system.
{"title":"Blind channel shortening algorithm based on correlation property of multicarrier signals","authors":"E. Ben Salem, Hichem Besbes, S. Cherif, Roberto López-Valcarce","doi":"10.1109/ICSCS.2009.5412609","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412609","url":null,"abstract":"In this paper, we propose a novel blind channel shortening algorithm to update the coefficients of the time domain equalizer (TEQ) in multicarrier system. The TEQ design investigates a second order statistics property of the received multicarrier signal, given by the presence of the cyclic prefix in the source. Here no assumptions about source stationarity and whiteness are needed to formulate the channel shortening criterion. The proposed shortener is implemented as a stochastic gradient descent algorithm and is compared to existing blind algorithms in terms of data bit rate. The simulation results are studied in the context of ADSL system.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"51 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130156401","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412700
Jamshaid Sarwar Malik, A. Hemani
Real-time wireless channel simulators are necessary for radio prototyping. Doppler filter is one of the basic building blocks in correlation-based channel simulators. Enormous computational complexity of channel models for new wireless standards like MIMOs prohibit their software realizations (which have traditionally been the case). In first part of this work, we dimension and compare two alternative implementations of the Doppler filter, one using FIR and the other using IIR. Next we provide hardware implementations to come up with area and power requirements for Doppler filters for channels as complicated as 10 × 10 MIMOs to conclude that 5th order IIR filters with 32-bit fixed-point MAC provide near optimum accuracy, area and power consumption and become a logical choice for hardware implementations for wireless channel simulators. We also provide FPGA implementation of our design to indicate their strength and potential role in future simulators. Finally we extrapolate our results to indicate future trends in wireless channel simulator implementation.
{"title":"On the design of Doppler filters for next generation radio channel simulators","authors":"Jamshaid Sarwar Malik, A. Hemani","doi":"10.1109/ICSCS.2009.5412700","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412700","url":null,"abstract":"Real-time wireless channel simulators are necessary for radio prototyping. Doppler filter is one of the basic building blocks in correlation-based channel simulators. Enormous computational complexity of channel models for new wireless standards like MIMOs prohibit their software realizations (which have traditionally been the case). In first part of this work, we dimension and compare two alternative implementations of the Doppler filter, one using FIR and the other using IIR. Next we provide hardware implementations to come up with area and power requirements for Doppler filters for channels as complicated as 10 × 10 MIMOs to conclude that 5th order IIR filters with 32-bit fixed-point MAC provide near optimum accuracy, area and power consumption and become a logical choice for hardware implementations for wireless channel simulators. We also provide FPGA implementation of our design to indicate their strength and potential role in future simulators. Finally we extrapolate our results to indicate future trends in wireless channel simulator implementation.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"74 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130484498","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412580
R. Bahloul, H. Boujemaa, M. Siala
In this paper, we evaluate the throughput performance of Hybrid Automatic Repeat reQuest (HARQ) protocols using Adaptive Modulation and Coding (AMC) based on either the instantaneous Signal to Noise Ratio (SNR) or the average SNR. We also propose a cross layer optimization algorithm in order to offer the highest throughput at the physical (PHY) layer and verify some Quality Of Service (QOS) constraints at the Medium Access (MAC) layer such as the Probability of Packet Erasure (PPE) and the transmission delay. Simulation results are also provided in different contexts in order to verify the tightness of the derived results.
{"title":"Cross layer strategies in wireless networks","authors":"R. Bahloul, H. Boujemaa, M. Siala","doi":"10.1109/ICSCS.2009.5412580","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412580","url":null,"abstract":"In this paper, we evaluate the throughput performance of Hybrid Automatic Repeat reQuest (HARQ) protocols using Adaptive Modulation and Coding (AMC) based on either the instantaneous Signal to Noise Ratio (SNR) or the average SNR. We also propose a cross layer optimization algorithm in order to offer the highest throughput at the physical (PHY) layer and verify some Quality Of Service (QOS) constraints at the Medium Access (MAC) layer such as the Probability of Packet Erasure (PPE) and the transmission delay. Simulation results are also provided in different contexts in order to verify the tightness of the derived results.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129422432","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5414203
A. Laha, E. Bugiel, J. X. Wang, H. Osten, A. Fissel
In this work, impact of domain boundaries on dielectric properties of epitaxial Gd2O3 thin films grown on Si(001) substrates with 4° miscut along [110] azimuth were studied. Epitaxial Gd2O3 layers with and without domain boundaries could be prepared on same Si(001) substrates with 4° miscut when the surface is prepared under special condition prior to the layer growth. A miscut substrate surface with terraces of biatomic steps height could be the crucial point to be succeeded to grow single domain epitaxial Gd2O3 layer. Epi-Gd2O3 layers without any domain boundaries exhibited significantly lower leakage currents compare to that commonly obtained epitaxial layers with two orthogonal domains. However, for capacitance equivalent thickness below 1 nm, the differences disappear, indicating that for ultra thin layers direct tunneling becomes dominant conduction mechanism. Additionally, a forming gas annealing treatment on these samples could further reduce the leakage current by few orders of magnitudes irrespective of their structure. Here, thinner layers of both structural types exhibited similar electrical properties.
{"title":"Effect of domain boundaries on dielectric properties of lanthanide oxide based gate dielectrics","authors":"A. Laha, E. Bugiel, J. X. Wang, H. Osten, A. Fissel","doi":"10.1109/ICSCS.2009.5414203","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5414203","url":null,"abstract":"In this work, impact of domain boundaries on dielectric properties of epitaxial Gd2O3 thin films grown on Si(001) substrates with 4° miscut along [110] azimuth were studied. Epitaxial Gd2O3 layers with and without domain boundaries could be prepared on same Si(001) substrates with 4° miscut when the surface is prepared under special condition prior to the layer growth. A miscut substrate surface with terraces of biatomic steps height could be the crucial point to be succeeded to grow single domain epitaxial Gd2O3 layer. Epi-Gd2O3 layers without any domain boundaries exhibited significantly lower leakage currents compare to that commonly obtained epitaxial layers with two orthogonal domains. However, for capacitance equivalent thickness below 1 nm, the differences disappear, indicating that for ultra thin layers direct tunneling becomes dominant conduction mechanism. Additionally, a forming gas annealing treatment on these samples could further reduce the leakage current by few orders of magnitudes irrespective of their structure. Here, thinner layers of both structural types exhibited similar electrical properties.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"25 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123220725","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412436
Ahmed M. Elmogy, A. Khamis, F. Karray
In this paper, a centralized and hierarchical dynamic and fixed tree task allocation approaches are presented to solve complex task allocation problem in multisensor surveillance systems. Complex tasks are tasks that can be decomposed to a set of subtasks and so can be executed by several possible ways. The complex task allocation problem is not only concerned with how to assign a set of tasks to a set of mobile robots, but also with how to coordinate the behavior of these mobile sensing nodes in order to perform cooperative tasks efficiently. The simulation results show that hierarchical dynamic tree task allocation outperforms all the other techniques especially in complex surveillance operations where large number of robots is used to scan large number of areas.
{"title":"Dynamic complex task allocation in multisensor surveillance systems","authors":"Ahmed M. Elmogy, A. Khamis, F. Karray","doi":"10.1109/ICSCS.2009.5412436","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412436","url":null,"abstract":"In this paper, a centralized and hierarchical dynamic and fixed tree task allocation approaches are presented to solve complex task allocation problem in multisensor surveillance systems. Complex tasks are tasks that can be decomposed to a set of subtasks and so can be executed by several possible ways. The complex task allocation problem is not only concerned with how to assign a set of tasks to a set of mobile robots, but also with how to coordinate the behavior of these mobile sensing nodes in order to perform cooperative tasks efficiently. The simulation results show that hierarchical dynamic tree task allocation outperforms all the other techniques especially in complex surveillance operations where large number of robots is used to scan large number of areas.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132504073","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5414173
I. Shrena, D. Eisele, E. Mayer, L. Reindl, J. Bardong, M. Schmitt
The measurement range of temperature using SAW-devices is depending on the substrate material used in the measurements. This dependence is related to the temperature point, where the substrate loses its piezoelectric properties. This occurs by the SAW-materials such as quartz and lithium niobate at about 570°C or 350°C, respectively. The piezoelectric material langasite (La3Ga5SiO14) has a thermodynamically stable phase and do not lose its piezoelectric properties up to its melting point at about 1470 °C and can be used for SAW devices at high temperatures. This paper presents the measurements of acoustical parameters of langasite up to 750°C. Langasite is used as substrate in the measurements with Euler angles (0°, 138.5°, 26.6°) and two different platinum (Pt) layer heights (45 nm and 75 nm) top of a zirconium (Zr) adhesion layer (4 nm). The investigated acoustic properties of langasite are group and phase velocity, propagation loss, and electromechanical coupling coefficient as functions of temperature. The measured data is analyzed using a special signal processing algorithm to obtain these acoustic properties of the Langasite.
{"title":"SAW-properties of langasite at high temperatures: Measurement and analysis","authors":"I. Shrena, D. Eisele, E. Mayer, L. Reindl, J. Bardong, M. Schmitt","doi":"10.1109/ICSCS.2009.5414173","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5414173","url":null,"abstract":"The measurement range of temperature using SAW-devices is depending on the substrate material used in the measurements. This dependence is related to the temperature point, where the substrate loses its piezoelectric properties. This occurs by the SAW-materials such as quartz and lithium niobate at about 570°C or 350°C, respectively. The piezoelectric material langasite (La3Ga5SiO14) has a thermodynamically stable phase and do not lose its piezoelectric properties up to its melting point at about 1470 °C and can be used for SAW devices at high temperatures. This paper presents the measurements of acoustical parameters of langasite up to 750°C. Langasite is used as substrate in the measurements with Euler angles (0°, 138.5°, 26.6°) and two different platinum (Pt) layer heights (45 nm and 75 nm) top of a zirconium (Zr) adhesion layer (4 nm). The investigated acoustic properties of langasite are group and phase velocity, propagation loss, and electromechanical coupling coefficient as functions of temperature. The measured data is analyzed using a special signal processing algorithm to obtain these acoustic properties of the Langasite.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131496501","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}
Pub Date : 2009-11-01DOI: 10.1109/ICSCS.2009.5412297
Daniel Olmeda, A. de la Escalera, J. M. Armingol
This article presents a pedestrian detector by means of a far infrared thermal camera, as part of an integrated driver assistance system. The final goal of the system is to warn the driver of pedestrians ahead of the vehicle. Detection is achieved by the extraction and evaluation of the main feature of pedestrians in far infrared images: the distribution of heat of the human body. Those objects with an appropriate size and temperature are correlated with probabilistic models that represent the average temperature of the different parts of the human body. Each pedestrian is tracked independently by an Unscented Kalman Filter.
{"title":"Detection and tracking of pedestrians in infrared images","authors":"Daniel Olmeda, A. de la Escalera, J. M. Armingol","doi":"10.1109/ICSCS.2009.5412297","DOIUrl":"https://doi.org/10.1109/ICSCS.2009.5412297","url":null,"abstract":"This article presents a pedestrian detector by means of a far infrared thermal camera, as part of an integrated driver assistance system. The final goal of the system is to warn the driver of pedestrians ahead of the vehicle. Detection is achieved by the extraction and evaluation of the main feature of pedestrians in far infrared images: the distribution of heat of the human body. Those objects with an appropriate size and temperature are correlated with probabilistic models that represent the average temperature of the different parts of the human body. Each pedestrian is tracked independently by an Unscented Kalman Filter.","PeriodicalId":126072,"journal":{"name":"2009 3rd International Conference on Signals, Circuits and Systems (SCS)","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125431819","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：