2022 Vol. 54 No. 6
2022, 54(6): 1-15.
DOI: 10.6054/j.jscnun.2022079
Abstract：
The efficient, fast and accurate information transmission in the large-scale neural network in the brain is the exact origin that the brain can control the complex life activities of humans and animals and enable organisms to survive in the changeable natural environment. As an important medium for information transmission between neurons, the synapses ensure the efficient operation of neural networks. Therefore, to build electronic synapses with synaptic functions is one essential way to study bionic systems and brain-like neural networks. Researchers have previously tried to simulate synaptic functions with various electronic devices, among which memristor has become one good candidate to build neuromorphic synapses due to its unique device structure and memory characteristics. The researches of memristor-based synapses in recent years are comprehensively summarized in this article, including the synaptic plasticity, metaplasticity, non-associative learning, associative learning and other functions. It also summarizes the application, problems and challenges in artificial neural networks, as well as the research prospects of memristor-based synapses.
The efficient, fast and accurate information transmission in the large-scale neural network in the brain is the exact origin that the brain can control the complex life activities of humans and animals and enable organisms to survive in the changeable natural environment. As an important medium for information transmission between neurons, the synapses ensure the efficient operation of neural networks. Therefore, to build electronic synapses with synaptic functions is one essential way to study bionic systems and brain-like neural networks. Researchers have previously tried to simulate synaptic functions with various electronic devices, among which memristor has become one good candidate to build neuromorphic synapses due to its unique device structure and memory characteristics. The researches of memristor-based synapses in recent years are comprehensively summarized in this article, including the synaptic plasticity, metaplasticity, non-associative learning, associative learning and other functions. It also summarizes the application, problems and challenges in artificial neural networks, as well as the research prospects of memristor-based synapses.
2022, 54(6): 16-22.
DOI: 10.6054/j.jscnun.2022080
Abstract：
To improve the rock-breaking efficiency of deep dry hot rock, taking granite, a common lithology of dry hot rock formation, as the research object, the changes in the mechanical properties of granite under ultra-high temperature was proposed. In view of the limitations of laboratory experimental methods, the Brazilian disc splitting numerical model of high-temperature granite was established by using numerical simulation and theoretical calculation methods, and the distribution characteristics and disturbance mechanism of stress field of hard granite under temperature-pressure conditions were investigated. It is found that under uniaxial and radial compression load, the stress distributions of high-temperature granite get significantly disturbed, leading to lower tensile stress along the horizontal direction, smaller compression and shear effect near the loading points, and easier fracture conduction. The higher the temperature, the more obvious the rock damage and the lower the tensile strength of the rock. The results reveal the evolution law of mechanical properties of granite under the effect of temperature, which can provide theoretical basis for efficient development of deep dry hot rock resources.
To improve the rock-breaking efficiency of deep dry hot rock, taking granite, a common lithology of dry hot rock formation, as the research object, the changes in the mechanical properties of granite under ultra-high temperature was proposed. In view of the limitations of laboratory experimental methods, the Brazilian disc splitting numerical model of high-temperature granite was established by using numerical simulation and theoretical calculation methods, and the distribution characteristics and disturbance mechanism of stress field of hard granite under temperature-pressure conditions were investigated. It is found that under uniaxial and radial compression load, the stress distributions of high-temperature granite get significantly disturbed, leading to lower tensile stress along the horizontal direction, smaller compression and shear effect near the loading points, and easier fracture conduction. The higher the temperature, the more obvious the rock damage and the lower the tensile strength of the rock. The results reveal the evolution law of mechanical properties of granite under the effect of temperature, which can provide theoretical basis for efficient development of deep dry hot rock resources.
2022, 54(6): 23-27.
DOI: 10.6054/j.jscnun.2022081
Abstract：
The quantum phases of many-body polaron was investigated in two-dimensional optical lattices in Mott Insulator regime. The polaron is a quasi-particle formed by the coupling between bosons in optical lattices and BEC phonons. The effective Hamiltonian of polarons is derived through Lang-Firsov transformation. The system can be described by extended Bose-Hubbard Model. In Mott Insulator regime, the Hamiltonian was solved directly so that the quantum phases of the system can be obtained for single-component case with filling factors of 1/2 and 1/4. By using Hartree-Fock approximation, more quantum phases for two-component case with filling factors of 1/2 and 1/4 can be found. Non-trivial quantum phases was predicted in single-component and two-component systems of polarons.
The quantum phases of many-body polaron was investigated in two-dimensional optical lattices in Mott Insulator regime. The polaron is a quasi-particle formed by the coupling between bosons in optical lattices and BEC phonons. The effective Hamiltonian of polarons is derived through Lang-Firsov transformation. The system can be described by extended Bose-Hubbard Model. In Mott Insulator regime, the Hamiltonian was solved directly so that the quantum phases of the system can be obtained for single-component case with filling factors of 1/2 and 1/4. By using Hartree-Fock approximation, more quantum phases for two-component case with filling factors of 1/2 and 1/4 can be found. Non-trivial quantum phases was predicted in single-component and two-component systems of polarons.
2022, 54(6): 28-36.
DOI: 10.6054/j.jscnun.2022082
Abstract：
The thermogravimetric analyzer (TGA), thermogravimetric analysis-Fourier transform infrared spectrometer (TG-FTIR) and thermal pyrolysis gas chromatography/mass spectrometry (PY-GC/MS) were used for the test and characterization of the thermal degradation process in the castor oil-based polyurethane resin, different non-isothermal kinetic methods were used to calculate the kinetic parameters of the resin and infer the thermal degradation mechanism of the resin. The results show that the castor oil-based polyurethane resin starts to degrade at 285 ℃ (5% mass loss), and the degradation is almost complete around 450 ℃ (95% mass loss). The thermal degradation process (take a heating rate of 10 ℃/min as an example) is divided into three stages: the first stage occurs at 285.23~345.25 ℃, the mass loss is 60%, mainly due to the rupture of the resin urethane bond and parts of the ester group decomposed into CO2; the second stage starts at 345.25~389.17 ℃ with 20% mass loss, the carbamate segment is degraded into amines, CO2 and small molecular organics containing CH3 or -CH2-; the third stage occurs at 389.17~450.00 ℃, the mass loss is 20%, mainly because the small molecular organic matter is further degraded into CO2 and N-containing volatile gas. The degradation mechanism may have two ways: the first is the cleavage of the carbon-oxygen bond on the left side of the ester group -O- in the main bond carbamate structure to form isocyanates and alcohols. The isocyanates are partially split into amines, carbon dioxide, etc., and the alcohol part is dehydrated to generate aldehydes or to synthesize olefins, enoic acids; the second is the cleavage of the -O- right carbon-oxygen bond in the carbamate structure to generate carbamic acid and alcohols. The carbamate partially cracked to generate primary amines and carbon dioxide, and alcohols partially cleft into aldehydes and olefins, etc.
The thermogravimetric analyzer (TGA), thermogravimetric analysis-Fourier transform infrared spectrometer (TG-FTIR) and thermal pyrolysis gas chromatography/mass spectrometry (PY-GC/MS) were used for the test and characterization of the thermal degradation process in the castor oil-based polyurethane resin, different non-isothermal kinetic methods were used to calculate the kinetic parameters of the resin and infer the thermal degradation mechanism of the resin. The results show that the castor oil-based polyurethane resin starts to degrade at 285 ℃ (5% mass loss), and the degradation is almost complete around 450 ℃ (95% mass loss). The thermal degradation process (take a heating rate of 10 ℃/min as an example) is divided into three stages: the first stage occurs at 285.23~345.25 ℃, the mass loss is 60%, mainly due to the rupture of the resin urethane bond and parts of the ester group decomposed into CO2; the second stage starts at 345.25~389.17 ℃ with 20% mass loss, the carbamate segment is degraded into amines, CO2 and small molecular organics containing CH3 or -CH2-; the third stage occurs at 389.17~450.00 ℃, the mass loss is 20%, mainly because the small molecular organic matter is further degraded into CO2 and N-containing volatile gas. The degradation mechanism may have two ways: the first is the cleavage of the carbon-oxygen bond on the left side of the ester group -O- in the main bond carbamate structure to form isocyanates and alcohols. The isocyanates are partially split into amines, carbon dioxide, etc., and the alcohol part is dehydrated to generate aldehydes or to synthesize olefins, enoic acids; the second is the cleavage of the -O- right carbon-oxygen bond in the carbamate structure to generate carbamic acid and alcohols. The carbamate partially cracked to generate primary amines and carbon dioxide, and alcohols partially cleft into aldehydes and olefins, etc.
2022, 54(6): 37-43.
DOI: 10.6054/j.jscnun.2022083
Abstract：
A series of NaMgBO3∶Ce3+/yYBO3∶Ce3+ (composite ratioy=0~0.035, mole ration) phosphors were prepared by a second-phase composite method, and their phase, morphology and optical properties were investigated. When YBO3∶5%Ce3+ was chosen as the complex substrate and composited into the NaMgBO3∶Ce3+ phosphor, the band gap of the sample increased, and the emission intensity of the sample at 464 nm was gradually enhanced with the increase of the YBO3∶Ce3+ composite ratio, and the optimal ratio y was 0.025. Since the emission peak of YBO3∶Ce3+in the range of 380-400 nm overlaps with the NaMgBO3∶Ce3+ excitation peak, and the emission intensity of the composite sample in this range will decrease with the increase of the mass concentration of YBO3∶Ce3+, which proves the existence of energy transfer between YBO3∶Ce3+ and NaMgBO3∶Ce3+. The results show that this phosphor can be a good candidate for cyan filling in full-spectrum illumination.
A series of NaMgBO3∶Ce3+/yYBO3∶Ce3+ (composite ratioy=0~0.035, mole ration) phosphors were prepared by a second-phase composite method, and their phase, morphology and optical properties were investigated. When YBO3∶5%Ce3+ was chosen as the complex substrate and composited into the NaMgBO3∶Ce3+ phosphor, the band gap of the sample increased, and the emission intensity of the sample at 464 nm was gradually enhanced with the increase of the YBO3∶Ce3+ composite ratio, and the optimal ratio y was 0.025. Since the emission peak of YBO3∶Ce3+in the range of 380-400 nm overlaps with the NaMgBO3∶Ce3+ excitation peak, and the emission intensity of the composite sample in this range will decrease with the increase of the mass concentration of YBO3∶Ce3+, which proves the existence of energy transfer between YBO3∶Ce3+ and NaMgBO3∶Ce3+. The results show that this phosphor can be a good candidate for cyan filling in full-spectrum illumination.
Abstract：
The relative content and structure of components of the essential oil from Mentha rotundifolia (L.) Huds. growing in Guizhou was analyzed and identified using headspace solid phase-microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS). As a result a total of 38 chemical components were identified from the volatile oil of Mentha rotundifolia (L.) Huds. in Guizhou. The main chemical components are D-carvone (relative content 51.78%) and D-limonene (relative content 20.93%). The HS-SPME-GC-MS shows the good characteristics of fast, comprehensive and accurate in the analysis of volatile oil of the Mentha rotundifolia (L.) Huds., indicating that it is very suitable for the analysis and identification of the essential oil of this species.
The relative content and structure of components of the essential oil from Mentha rotundifolia (L.) Huds. growing in Guizhou was analyzed and identified using headspace solid phase-microextraction gas chromatography-mass spectrometry (HS-SPME-GC-MS). As a result a total of 38 chemical components were identified from the volatile oil of Mentha rotundifolia (L.) Huds. in Guizhou. The main chemical components are D-carvone (relative content 51.78%) and D-limonene (relative content 20.93%). The HS-SPME-GC-MS shows the good characteristics of fast, comprehensive and accurate in the analysis of volatile oil of the Mentha rotundifolia (L.) Huds., indicating that it is very suitable for the analysis and identification of the essential oil of this species.
2022, 54(6): 51-58.
DOI: 10.6054/j.jscnun.2022085
Abstract：
In the L. variegatus, Se-Met and Se-Cys were the main Se species. The benthic model organism, Lumbriculus variegatus, was used to quantify the content and morphology of selenium in the Lumbriculus by ICP-MS after 21 d exposure to environmentally relevant concentrations of the sedimentary phase Se(Ⅳ). The results showed that selenium could effectively accumulate in the Lumbriculus at environmentally relevant concentrations, and the morphology was mainly dominated by Se-Met and Se-Cys. In addition, Se at environmental related concentrations in the sediment increased the oxidative stress, inhibited the activities of Na+/K+-ATP enzyme and digestive enzymes of L. variegatus, inducing the decrease of condition factors and bioaccumulation. The results shed a light on the Se species, biological accumulation and effect of Se(Ⅳ) in sediments in the benthos, and provide theoretical basis and fundamental data for the bioaccumulation and effects of selenium in sediments.
In the L. variegatus, Se-Met and Se-Cys were the main Se species. The benthic model organism, Lumbriculus variegatus, was used to quantify the content and morphology of selenium in the Lumbriculus by ICP-MS after 21 d exposure to environmentally relevant concentrations of the sedimentary phase Se(Ⅳ). The results showed that selenium could effectively accumulate in the Lumbriculus at environmentally relevant concentrations, and the morphology was mainly dominated by Se-Met and Se-Cys. In addition, Se at environmental related concentrations in the sediment increased the oxidative stress, inhibited the activities of Na+/K+-ATP enzyme and digestive enzymes of L. variegatus, inducing the decrease of condition factors and bioaccumulation. The results shed a light on the Se species, biological accumulation and effect of Se(Ⅳ) in sediments in the benthos, and provide theoretical basis and fundamental data for the bioaccumulation and effects of selenium in sediments.
2022, 54(6): 59-67.
DOI: 10.6054/j.jscnun.2022086
Abstract：
Glutathione peroxidase 4(GPX4) is a selenoprotein that can specifically catalyze the conversion of glutathione from lipid peroxides to lipid alcohols. Up-regulation of GPX4 expression plays an important role in inhibiting ferroptosis and related inflammation. In order to screen out the potential active small molecules that can activate glutathione peroxidase 4(GPX4) from Artemisia annua, 126 active small molecules of Artemisia annua were firstly retrieved from the Traditional Chinese Medicine System Pharmacology Database and Analysis Platform and 50 active small molecules of Artemisia annua were screened out according to drug-like properties. Further, 8 active small molecules of Artemisia annua were screened out through GPX4-ligand docking simulation and GPX4-ligand inte-raction pattern. Analysis and screening with GPX4-ligand free binding energy calculation found that artemisinin, patuletin and kaempferol acted similarly to the positive control 1d4(PKUMDL-LC-101-D03). Finally, molecular dynamics simulation was performed. The results showed that artemisinin, patuletin, kaempferol and the positive control 1d4 can form a stable complex with GPX4.
Glutathione peroxidase 4(GPX4) is a selenoprotein that can specifically catalyze the conversion of glutathione from lipid peroxides to lipid alcohols. Up-regulation of GPX4 expression plays an important role in inhibiting ferroptosis and related inflammation. In order to screen out the potential active small molecules that can activate glutathione peroxidase 4(GPX4) from Artemisia annua, 126 active small molecules of Artemisia annua were firstly retrieved from the Traditional Chinese Medicine System Pharmacology Database and Analysis Platform and 50 active small molecules of Artemisia annua were screened out according to drug-like properties. Further, 8 active small molecules of Artemisia annua were screened out through GPX4-ligand docking simulation and GPX4-ligand inte-raction pattern. Analysis and screening with GPX4-ligand free binding energy calculation found that artemisinin, patuletin and kaempferol acted similarly to the positive control 1d4(PKUMDL-LC-101-D03). Finally, molecular dynamics simulation was performed. The results showed that artemisinin, patuletin, kaempferol and the positive control 1d4 can form a stable complex with GPX4.
2022, 54(6): 68-75.
DOI: 10.6054/j.jscnun.2022087
Abstract：
It is not clear whether the Silver nanoparticles (AgNPs) with different morphologies have different toxi-city to Scenedesmus Obliquus. In order to reveal the toxic effects of Scenedesmus Obliquus exposed to different morphologies of silver nanoparticles, Silver Nano Spheres (AgNSs) and Silver Nano Cubes (AgNCs) were exposed to the algae at 0, 5, 10, 15 and 20 mg/L respectively, observing the physiological and biochemical responses of the tested organisms. The results showed that the exposure of AgNSs and AgNCs both had significant toxic effects on Scenedesmus Obliquus, which showed damage of photosynthetic system and enzyme stress reaction: (1) Under 12-48 h exposure, mass concentration of Chlorophyll a in all treatment groups decreased significantly, but there were also obvious differences. When the AgNSs concentration reached 10 mg/L, the Chlorophyll a inhibitory effect could be significantly produced, and when the AgNSs concentration was greater than 10 mg/L, the inhibitory effect remained stable. While AgNCs significantly inhibited Chlorophyll a when the concentration was only 5 mg/L, and the inhibition effect was alleviated at 20 mg/L. (2) There are differences in typical enzyme stress responses between AgNSs and AgNCs exposure: The content of Reactive Oxygen Species (ROS) was significantly lower than that of the latter. The malondialdehyde (MDA) content of AgNSs was higher when the mass concentration of AgNSs and AgNCs were less than 15 mg/L, and the results were opposite when mass concentration of AgNSs and AgNCs were more than 15 mg/L. The superoxide dismutase (SOD) activity of the former remained stable while that of the latter decreased when the mass concentration of AgNSs and AgNCs were above 5 mg/L. (3) The difference of typical enzyme stress response between AgNSs and AgNCs was related to particle size, specific surface area and geometric shape. The results of this study can provide basic data for the emission control of silver nanoparticles in water environment.
It is not clear whether the Silver nanoparticles (AgNPs) with different morphologies have different toxi-city to Scenedesmus Obliquus. In order to reveal the toxic effects of Scenedesmus Obliquus exposed to different morphologies of silver nanoparticles, Silver Nano Spheres (AgNSs) and Silver Nano Cubes (AgNCs) were exposed to the algae at 0, 5, 10, 15 and 20 mg/L respectively, observing the physiological and biochemical responses of the tested organisms. The results showed that the exposure of AgNSs and AgNCs both had significant toxic effects on Scenedesmus Obliquus, which showed damage of photosynthetic system and enzyme stress reaction: (1) Under 12-48 h exposure, mass concentration of Chlorophyll a in all treatment groups decreased significantly, but there were also obvious differences. When the AgNSs concentration reached 10 mg/L, the Chlorophyll a inhibitory effect could be significantly produced, and when the AgNSs concentration was greater than 10 mg/L, the inhibitory effect remained stable. While AgNCs significantly inhibited Chlorophyll a when the concentration was only 5 mg/L, and the inhibition effect was alleviated at 20 mg/L. (2) There are differences in typical enzyme stress responses between AgNSs and AgNCs exposure: The content of Reactive Oxygen Species (ROS) was significantly lower than that of the latter. The malondialdehyde (MDA) content of AgNSs was higher when the mass concentration of AgNSs and AgNCs were less than 15 mg/L, and the results were opposite when mass concentration of AgNSs and AgNCs were more than 15 mg/L. The superoxide dismutase (SOD) activity of the former remained stable while that of the latter decreased when the mass concentration of AgNSs and AgNCs were above 5 mg/L. (3) The difference of typical enzyme stress response between AgNSs and AgNCs was related to particle size, specific surface area and geometric shape. The results of this study can provide basic data for the emission control of silver nanoparticles in water environment.
2022, 54(6): 76-85.
DOI: 10.6054/j.jscnun.2022088
Abstract：
To improve the level of ecological civilization construction and the quality of green development under the process of urbanization, the characteristics of urban green growth efficiency were studied. Based on the indicators of economic output, resource input and environmental emission of the 46 most representative large cities in China, the synthetic index evaluation method and the multiple correspondence analysis methods were used to analyze the greener growth efficiency characteristics of large cities in the new normal state. The results showed that the efficiency of greener growth in large cities was higher in the east and lower in the west, and higher in the south and lower in the north. Cities of higher level or larger population scale tended to be more efficient in greener growth. In terms of changes, the greener growth efficiency of the heavy industry cities in the new normal period had a smaller overall increase, and the cities in the southwest and northwest China had significantly improved their economic output, resource input and environmental emission, respectively. Based on the analysis results, it was proposed that in the process of promoting the green development of cities, formulating strategies are necessary to improve the greener growth efficiency and take differentiated green development paths according to the development characteristics of various kinds of cities, such as developed large cities, regional central cities and heavy industries dependent cities.
To improve the level of ecological civilization construction and the quality of green development under the process of urbanization, the characteristics of urban green growth efficiency were studied. Based on the indicators of economic output, resource input and environmental emission of the 46 most representative large cities in China, the synthetic index evaluation method and the multiple correspondence analysis methods were used to analyze the greener growth efficiency characteristics of large cities in the new normal state. The results showed that the efficiency of greener growth in large cities was higher in the east and lower in the west, and higher in the south and lower in the north. Cities of higher level or larger population scale tended to be more efficient in greener growth. In terms of changes, the greener growth efficiency of the heavy industry cities in the new normal period had a smaller overall increase, and the cities in the southwest and northwest China had significantly improved their economic output, resource input and environmental emission, respectively. Based on the analysis results, it was proposed that in the process of promoting the green development of cities, formulating strategies are necessary to improve the greener growth efficiency and take differentiated green development paths according to the development characteristics of various kinds of cities, such as developed large cities, regional central cities and heavy industries dependent cities.
Abstract：
To analyze the influence of agricultural land in subtropical humid zone on regional climate, the spatial and temporal variation characteristics of the thermal environmental effect of agricultural land in subtropical humid zone and its relationship with the main biophysical factors were analyzed in Jiangxi Province, based on MODIS surface temperature data from 2003 to 2019, with natural forest land as a reference. Results show: (1) agricultural lands warm the land surface significantly relativity to natural forests during the day, with annual mean temperature increase of 1.9 ℃, whereas cool the temperature substantially at night; (2) the thermal environment effects of agricultural lands vary greatly by the season, especially at night, characterized by weak nighttime warming effects du-ring summer; (3) both the daytime warming and nighttime cooling effects of agricultural lands show upward trends from 2003 to 2019; (4) the thermal environment effects of agricultural lands are primarily controlled by evapotranspiration during the day and by the joint control of evapotranspiration and surface albedo at night.
To analyze the influence of agricultural land in subtropical humid zone on regional climate, the spatial and temporal variation characteristics of the thermal environmental effect of agricultural land in subtropical humid zone and its relationship with the main biophysical factors were analyzed in Jiangxi Province, based on MODIS surface temperature data from 2003 to 2019, with natural forest land as a reference. Results show: (1) agricultural lands warm the land surface significantly relativity to natural forests during the day, with annual mean temperature increase of 1.9 ℃, whereas cool the temperature substantially at night; (2) the thermal environment effects of agricultural lands vary greatly by the season, especially at night, characterized by weak nighttime warming effects du-ring summer; (3) both the daytime warming and nighttime cooling effects of agricultural lands show upward trends from 2003 to 2019; (4) the thermal environment effects of agricultural lands are primarily controlled by evapotranspiration during the day and by the joint control of evapotranspiration and surface albedo at night.
2022, 54(6): 95-101.
DOI: 10.6054/j.jscnun.2022090
Abstract：
The existence of positive solutions for the fractional differential equation with fractional differential boundary value condition {Dv0+u(t)+h(t)f(t,u(t))=0(0<t<1,n−1<v⩽ is considered under some conditions, where D0+v is Rimann-Liouvile fractional differential, ηi∈(0, 1), 0 < η1 < η2 < … < ηm-2 < 1, βi∈[0, ∞). Firstly, the Green function for the above fractional differential equation is constructed. The properties of the Green's function are obtained. Secondly, by using the fixed point index theorem on convex functional to calculate the fixed point index, the conclusion that there is at least one positive solution to the above boundary value problem is obtained. Finally, an example is given to illustrate the application of the main theorem.
The existence of positive solutions for the fractional differential equation with fractional differential boundary value condition {Dv0+u(t)+h(t)f(t,u(t))=0(0<t<1,n−1<v⩽ is considered under some conditions, where D0+v is Rimann-Liouvile fractional differential, ηi∈(0, 1), 0 < η1 < η2 < … < ηm-2 < 1, βi∈[0, ∞). Firstly, the Green function for the above fractional differential equation is constructed. The properties of the Green's function are obtained. Secondly, by using the fixed point index theorem on convex functional to calculate the fixed point index, the conclusion that there is at least one positive solution to the above boundary value problem is obtained. Finally, an example is given to illustrate the application of the main theorem.
2022, 54(6): 102-108.
DOI: 10.6054/j.jscnun.2022091
Abstract：
The theory of the semi-tensor product of matrices is applied to systematic matrix description of FI algebra, and the matrix expressions of FI algebra are presented. Via these matrix expressions, the properties of the homomorphisms, isomorphisms and related structures of the derivatives of the FI algebra are studied. At the same time, straightforward verifiable conditions for detecting the properties above are obtained by using logical matrices operations.
The theory of the semi-tensor product of matrices is applied to systematic matrix description of FI algebra, and the matrix expressions of FI algebra are presented. Via these matrix expressions, the properties of the homomorphisms, isomorphisms and related structures of the derivatives of the FI algebra are studied. At the same time, straightforward verifiable conditions for detecting the properties above are obtained by using logical matrices operations.
2022, 54(6): 109-118.
DOI: 10.6054/j.jscnun.2022092
Abstract：
Most of the existing forward secure searchable encryption schemes are mainly for single-user settings and cannot be easily extended to multi-user settings since the keyword state is maintained locally; there are few forward secure schemes that support multi-user retrieval, and they require additional trusted proxy servers, which brings additional overhead and insufficient practicality. Aiming at the current lack of practical multi-user forward secure searchable encryption scheme, a searchable encryption scheme (EMFS) based on a two-chain index structure is designed, which meets forward security and supports multi-user retrieval without the need for a proxy server. The double-layer index consists of the main chain index and a slave chain index. The main chain index is generated by the one-way trapdoor function and the global state and does not depend on the separate state of each keyword, thus avoiding the synchronization problem of the keyword state among multiple users; the slave chain index is generated by stream cipher, which improves the search efficiency. Compared with three existing single-user forward security schemes (Sophos, FAST, BESTIE), the results show that the EMFS scheme has good scalability and practicability: (1) The EMFS scheme achieves the expansion of multi-user retrieval at a reasonable cost of search perfor-mance; (2) The EMFS scheme is especially suitable for matching datasets with a large number of files; (3) The EMFS scheme has the advantage of small client storage overhead.
Most of the existing forward secure searchable encryption schemes are mainly for single-user settings and cannot be easily extended to multi-user settings since the keyword state is maintained locally; there are few forward secure schemes that support multi-user retrieval, and they require additional trusted proxy servers, which brings additional overhead and insufficient practicality. Aiming at the current lack of practical multi-user forward secure searchable encryption scheme, a searchable encryption scheme (EMFS) based on a two-chain index structure is designed, which meets forward security and supports multi-user retrieval without the need for a proxy server. The double-layer index consists of the main chain index and a slave chain index. The main chain index is generated by the one-way trapdoor function and the global state and does not depend on the separate state of each keyword, thus avoiding the synchronization problem of the keyword state among multiple users; the slave chain index is generated by stream cipher, which improves the search efficiency. Compared with three existing single-user forward security schemes (Sophos, FAST, BESTIE), the results show that the EMFS scheme has good scalability and practicability: (1) The EMFS scheme achieves the expansion of multi-user retrieval at a reasonable cost of search perfor-mance; (2) The EMFS scheme is especially suitable for matching datasets with a large number of files; (3) The EMFS scheme has the advantage of small client storage overhead.
2022, 54(6): 119-127.
DOI: 10.6054/j.jscnun.2022093
Abstract：
Currently, it is of significant importance to design a hybrid signcryption scheme (HSC) with full insider security, and one of the crucial methods is to implement an efficient and secure signcryption key encapsulation mechanism (SC-KEM). To this goal, a new generic construction scheme (HSCstd) of secure signcryption tag key encapsulation mechanism (SC-tag-KEM) is proposed, which signing a tag together with the encapsulation of key, and using message authentication code binding of the signature and the ephemeral key to achieve DM-IND-iCCA security and DM-SUF-iCMA security under the standard model, thus the foundation for full insider security is established. Furthermore, combined with the passive-secure symmetric encryption scheme, a new generic construction (HSCstd) of hybrid signcryption scheme achieving the full insider security is presented. It is analysed to achieve DM-CCA2 security and SUF-CMA security under the standard model, thus achieving the full insider security.
Currently, it is of significant importance to design a hybrid signcryption scheme (HSC) with full insider security, and one of the crucial methods is to implement an efficient and secure signcryption key encapsulation mechanism (SC-KEM). To this goal, a new generic construction scheme (HSCstd) of secure signcryption tag key encapsulation mechanism (SC-tag-KEM) is proposed, which signing a tag together with the encapsulation of key, and using message authentication code binding of the signature and the ephemeral key to achieve DM-IND-iCCA security and DM-SUF-iCMA security under the standard model, thus the foundation for full insider security is established. Furthermore, combined with the passive-secure symmetric encryption scheme, a new generic construction (HSCstd) of hybrid signcryption scheme achieving the full insider security is presented. It is analysed to achieve DM-CCA2 security and SUF-CMA security under the standard model, thus achieving the full insider security.
