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Tunnel Boring Machines (TBMs) have been successfully applied in the excavation of deep shaft roadways in coal mines, yielding substantial socio-economic benefits. However, technical bottlenecks remain that hinder their further promotion and application. In response to the challenge of current support structures and techniques failing to simultaneously meet the requirements of support efficiency, strength, and construction costs, which impedes the full utilization of TBM speed advantages, a research team has developed a novel steel pipe segment assembly support structure. Large-scale model tests of the new prefabricated support structure were conducted to ascertain the deformation and failure patterns under loaded conditions, and the support structure was optimized based on the test results. Numerical simulations were performed to evaluate the reliability of the new support structure under TBM tunneling conditions. Industrial trials were subsequently conducted to field-test the feasibility of the new steel pipe segment support structure for TBM-excavated roadways in coal mines. The test results indicate that the maximum tensile strain of the surrounding rock is 803 με, and the deformation of the steel pipe support structure is less than 1 mm. The new support structure can be installed quickly, with the installation of one ring of segments (1.5 m) completed within 90 minutes, significantly enhancing the support strength in TBM-excavated roadways and the adaptability to strata conditions. This research provides a technical reference for further increasing the tunneling speed of coal mine roadways and ensuring the continuity of coal mining operations.

The coal mine drilling shaft wall is a single-layer structure, and water leakage in the deep alluvium will seriously threaten mine safety. If there are construction defects in the stubble part of the well wall at the construction stage, it will lead to groundwater corrosion and rust through the metal and the weld seam of the stubble part, resulting in water leakage from well wall, which, if not treated promptly, is prone to lead to a sudden water-sand inrush and flooding accidents. In order to explore an effective treatment technology, a research on the control technology of water leakage from the wall of coal mine drilling wells was carried out with the background of water leakage control of wall of sub-well of the Xutong Coal Mine. Firstly, the causes of water leakage from the single-layer well wall of the drilling method were analyzed with the information of hydrogeological characteristics of mine. It was found that the main reason of water leakage at the sub-well wall of Xutong Mine was that the high-pressure groundwater recharged from the aquifers flowed into the well through the gravel packing layer with great pore connectivity, after the corrosive effects of groundwater jointly penetrated the stubs of well walls. Then, the feasibility and safety of using post-wall grouting and ground drilling grouting for water leakage control in the wall of sub-well wall in Xutong Coal Mine were compared and analyzed. Post-wall grouting of reinforced concrete single-layer well walls constructed using the drilling method in fluvial sand layer was found to pose a high safety risk, affecting the normal lifting of wellbore and risking the reoccurrence of water leakage. Ground directional drilling grouting technology had a large grouting volume, and the pores in the gravel filling layer behind the wall can be fully filled by cement slurry, improving the leakage prevention and bearing capacity of the wellbore, and the construction personnel operated on the ground, which was safe and did not affect the normal lifting of the wellbore. Finally, the ground directional drilling grouting technology for water leakage control of coal mine wall in deep alluvium was proposed and demonstrated. A total of 130.9 m3 of cement slurry was injected into the two boreholes, which completely filled the pores space between the gravel of the filling layer behind the wall of the layer from 94.00-131.40 m, and successfully blocked the water outlet point at 94 m downhole. No further water leakage from this section of the well wall had been observed on site over a long period of time. The research results shown that, the ground directional drilling grouting technology had good control effect and high safety for the water leakage of coal mine drilling well wall in deep alluvium. The research results can provide a certain reference for the water leakage control of coal mine drilling well wall in deep alluvium.

To study the law of surface subsidence velocity caused by coal seam mining under thick and loose layers and thin bedrock, taking the 110801 first mining face of a mine in Huainan Mining Area as the engineering background, the finite difference software FLAC3D was used to simulate the surface subsidence velocity of coal mining under the conditions of different mining speed, mining height, mining width, loose layer thickness and bedrock layer thickness conditions, and the influence mechanism and sensitivity of various parameters on the surface subsidence velocity were obtained. The results indicate that: the surface subsidence velocity increases with the increase of mining speed, mining height and mining width, but decreases with the increase of foundation rock thickness and loose layer thickness; the maximum surface subsidence velocity increases linearly with the increase of mining speed, mining height and mining width, and decreases linearly with the increase of loose layer thickness, which decreases in power function with the thickness of bedrock layer; the sensitivity of each influencing factor to the maximum surface subsidence velocity is mining width, bedrock layer thickness, loose layer thickness, mining speed and mining height in descending order.

Aiming at the problems of gas lift reverse circulation shaft washing slag discharge and low drilling efficiency in the application of vertical shaft drilling method in the Jurassic strata coal mines in western China, taking ϕ4.2 m advanced drilling of central return air shaft in the Kekegai coal mine as the engineering background, based on the CFD-DEM (computational fluid dynamics and discrete element method coupling) research method, a gas-liquid-solid multiphase coupling slag discharge numerical model is established, which reveals the velocity and pressure distribution law of the flow field in the slag discharge pipe and the bottom hole. Based on the self-developed gas lift reverse circulation slag discharge test device, the correctness of the flow field distribution is verified by PIV (Particle Image Velocimetry) test technology. The evaluation index and method of optimizing cutter head suction port are put forward. The number, length-diameter ratio, area ratio and total area ratio of slag suction outlets are optimized. The best way and related parameters of cutter head suction port arrangement of advanced bit are optimized. The effects of main factors such as bit speed, gas injection rate, submerged ratio of air duct and mud viscosity on slag discharge flow field are discussed. The research results show that ① the fluid in the slag discharge pipe mainly moves in the axial direction, and when passing through the gas injection end, the velocity increases sharply. The migration of bottom hole fluid is mainly horizontal flow, and the vertical upward flow of fluid only exists near the slag suction port. The horizontal flow at the bottom of the shaft is mainly tangential flow, and the radial flow is obvious only on both sides of the slag suction port, and it is far away from the slag suction port, so the runoff speed is small and it is easy to produce cuttings deposition. ② When the number of slag suction ports of cutter head is 2, the length-diameter ratio is 0.4, the area ratio is 1, and the total area ratio is 1.94%, the layout of slag suction ports is the best, and the slag removal rate is increased by 66% compared with the current layout of slag suction ports. ③ Increasing the bit speed can significantly enhance the adsorption of the slag suction port. The gas injection rate and the submerged ratio of the air duct are positively correlated with the axial velocity of the fluid in the bottom hole and the slag discharge pipe. The mud with low viscosity and low density is easy to obtain high return velocity, but its rock carrying capacity is poor. The research results can provide a useful theoretical reference for solving the technical problems of washing, slag removal and low drilling efficiency of deep and large vertical shaft drilling in the Jurassic strata.

The surface movement duration is a key parameter for the evaluation of the stability of surface movement and deformation, and accurately predicting the surface movement duration under different geological conditions and mining intensity is crucial for the stability assessment of the surface and ground facilities. Firstly, a new model assumption is proposed based on the classical Knothe time model assumption, and an improved Knothe time model, which only contains one model parameter and can accurately describe the dynamic subsidence law of the surface, has been developed. Then, based on the improved Knothe time model, a surface movement duration prediction model that can comprehensively consider the mining depth, coal seam thickness and mining speed of the working face is established, and the determination method of model parameters is provided according to the probability integral method. Finally, the accuracy and rationality of the surface movement duration prediction model were verified by using monitoring data of the surface movement duration in 20 mining areas. The results showed that the predicted value of the surface movement duration prediction model based on the improved Knothe time model is highly consistent with the monitoring values in 20 mining areas, and their root mean square error (ERMS) is only 64 days, which is far less than 882 days of the Specifications of Coal Mining and Pillar Retention Under Buildings, Water and Railways and 152 days of the Knothe time model, which verifies the accuracy and rationality of the prediction model of surface movement duration. The surface movement duration is affected by coal seam mining height, average mining depth and coal seam mining speed, and increases nonlinearly with the increase of coal seam mining height, increases linearly with the increase of average mining depth, but decreases nonlinearly with the increase of coal seam mining speed; When the mining speed of coal seam is less than 5 m/d, the surface movement duration can be shortened by appropriately increasing the mining speed of coal seam. The study can provide some reference for the prediction of the stable time of surface movement and deformation in coal mining.

In order to achieve better test performance, researches on the randomness test strategies based on deep learning were conducted, including the batch average strategy proposed by EUROCRYPT 2021 and the selection strategy for data unit size.By introducing the randomness statistical test model based on deep learning methods, the statistical distribution and test power expression of two test strategies were theoretically derived, and it was pointed out that: (i) the batch average strategy could amplify the prediction accuracy of the model, but it was prone to an increase in the probability of the second type of error in statistics, instead reducing the statistical test power; (ii) the smaller data units of the deep model generally obtained the more powerful statistical tests.Based on the above understanding, a new bit-level deep learning model was proposed for randomness statistical tests, which gained the advantage of prediction with 80 times fewer parameters and 50% samples, compared with the previous work on linear congruent generator (LCG) algorithm, and achieved significant prediction advantages with 10～20 times fewer parameters by extending the model to apply to 5～7 rounds of Speck, compared with the model proposed by Gohr.

【Objective】In order to analyze the effects of different types of food excipients on the dissolving ability and main carotenoid content of spray-dried sweet corn nutritional paste, and to screen the key excipients that are beneficial to improving the dissolving ability and carotenoid stability of spray-dried sweet corn nutritional paste, so as to provide a reference to producing high-quality spray-dried sweet corn nutritional paste.【Method】The water solubility index (WSI), dispersal time, caking rate, total content of lutein and zeaxanthin were used as evaluation indicators to select key additives for improving the dissolving ability and carotenoid stability of sweet corn paste by single-factor experiments. WSI, carotenoid (total lutein and zeaxanthin) content were used as evaluation indicators to optimize the slurry formula for preparing spray-dried sweet corn paste by response surface methodology. And practical applications verified the optimized formula.【Result】The additives such as maltodextrin, sucrose, and fructooligosaccharide which could significantly improve the dispersibility and carotenoids stability were defined as key excipients for spray-dried sweet corn paste. The optimal homogenate formula for preparation of sweet corn nutritional paste by spray drying obtained by response surface optimization was as follows: 25% maltodextrin, 1% fructooligosaccharide and 12% sucrose, calculated based on sweet corn dry base. Verification experiments of the the optimized slurry formula showed that the WSI of the spray-dried sweet corn flour was 70.67 (±1.24)%, and the total lutein and zeaxanthin content was 152.12 (±1.30) μg/g (dry weight). Compared with sweet corn flour without additives, the WSI increased by 34.84%, and the total lutein and zeaxanthin content increased by 11.37%.【Conclusion】Compared with protein and lipid, carbohydrate such as maltodextrin, sucrose, and fructooligosaccharide could significantly improve the dissolving ability and carotenoids stability of sweet corn paste and therefore could be used as key excipients for the preparation of sweet corn nutritional paste by spray drying. This study provided a feasible formulating way for producing high-quality sweet corn nutritional paste by spray drying, which could effectively improve the dissolving ability and the stability of carotenoids.

The synchronization problem in the existing mobile communication network was studied from three perspectives: technology, standard and testing.It includes the research on the synchronization principle of wireless side, the analysis of the impact of synchronization anomaly on wireless service, and the comparison and difference analysis of synchronization standards between wired side and wireless side, etc.Aiming at the above problems, the corresponding solutions were proposed, including wireless side synchronization performance testing, monitoring methods and synchronization standard revision, etc., to ensure the normal operation of mobile communication synchronization system.

In order to improve the rotating bending fatigue life of PH13 - 8Mo stainless steel, the surface morphology, surface roughness and fatigue life of samples without shot peening, single shot peening and composite shot peening were tested respectively in the H510, H540 and H550 heat - treated states. Results showed that in the comparison with single shot peening, the fatigue enhancing effect of the specimens treated with composite shot peening in H540 and H550 states was significantly better than that of the specimens in H510 state. Under the condition that σmax=800 MPa and R=-1, the Kt=1 fatigue life of specimens in H510, H540 and H550 states was increased by 0.3, 1.4 and 1.4 times respectively. Compared with single shot peening, the enhancing effect of Kt=2 composite shot peening had better than that of Kt=1. Under the condition that σmax=550 MPa and R=-1, the Kt=2 rotating bending fatigue life was increased by 5.5 times. Shot peening could improve the fatigue life of PH13 - 8Mo steel. The Kt=1 rotating bending fatigue life of the specimens treated with shot peening was at least 1 order of magnitude higher than that of the non - shot peening specimens. Besides, the surface roughness, surface morphology, residual stress field and fatigue life of composite shot peening specimens were all better than that of the specimens treated with single shot peening.

In view of the problem that edible Areca catechu seeds treated as waste and cannot be massively used after processing, in this study, the waste seeds after edible Areca catechu processing (PAS) are used. 75% ethanol extract of PAS (processed seed extraction, PSE) was extracted assisted by ultrasonic with a 75% ethanol solution as the extraction solvent. The contents of total polyphenols, total flavonoids and proanthocyanidins in the PSE were determined. Three methods (radical scavenging activities and Fe3+ reduction) were used to evaluate the antioxidant activity of PSE. Then the inhibitory of PSE on the activity of α-glucosidase was studied. The result showed that PSE was rich in polyphenols and flavonoid. The total contents of polyphenols, flavonoids and proanthocyanidins were (127.29±5.16) milligram gallic acid, (421.84±13.82) milligram rutin, and (87.83±6.60) milligram epicatechin in per gram of PSE, respectively. PSE contains 44 flavonoids were detected in PSE, in which the relative content of catechins was up to 77.27%. The IC50 for scavenging DPPH free radical and ABTS+ free radical of PSE were (310.10±0.62) and (150.10±11.57) μg/mL, respectively. In addition, PSE had significant inhibitory effect on α-glucosidase, and its ability to inhibit α-glucosidase (IC50=(90.10±1.89) μg/mL) was significantly stronger (P

On the basis of current situation and existing problems analysis of laboratory animal facility maintenance in colleges and universities, as well as many years of practice, the author believes that socialized services of laboratory animal facility maintenance in colleges and universities can effectively control the system risk, improve the efficiency of facilities, and meet the national requirements for the socialization reform in college logistics.

Using high performance liquid chromatography-mass spectrometry(HPLC-MS/MS) technology, the components in the water extract of loquat leaves were analyzed, and the terpenoids were analyzed. Using a C18 column (2.1 mm×100 mm, 1.8 μm), using water +0.1% formic acid solution as mobile phase gradient elution, using ESI ion source, collecting mass spectrometry data in positive and negative ion modes, a total of 120 compounds were detected ; Including 18 kinds of terpenoids with a total relative content of 1452.693 μg/mL; 24 kinds of flavonoids with a total relative content of 10378.081 μg/mL; 18 kinds of phenolic compounds with a total relative content of 36967.955 μg/mL; 5 kinds of coumarins compounds with a total relative content of 214.778 μg/mL; The structures of 18 terpenoids were further identified, including 6 ursane type, 7 oleanane type, 3 sesquiterpenes, and 1 diterpenoid. And a special iridoid glycosides; Roburic acid, ginkgolide B, prespatane, shanzhiside methyl ester, icariside B5, quillaic acid, asiatic acid, 18β-glycyrrhetinic acid were no report in the previous active substances of loquat leaves. This article provides a reference for the research on the water-extracted components of loquat leaves.

Longde County in southern Ningxia is located at the western foot of Liupan mountain. Geological conditions is complicated. Affected by seasonal heavy rainfall, landslides and geological disasters occur frequently in the area, which poses a serious threat to local people's lives and property. In consideration of the high fractional vegetation in study area, integrated remote sensing technologies combined of Synthetic Aperture Radar Difference Interferometry technology and high spatial resolution optical remote sensing have been used in early detection of Landslides in the Longde county. Stacking technology has been used to calculate the rate of deformation from 2019.01 to 2021.05, in the direction of ascending and descending orbit. Combining high spatial resolution optical remote sensing images and digital elevation model (DEM), the interpretation key of landslide in the area deformation has been established. Then the early detection of landslides and ground survey in Longde county have been done. Through the integrated remote sensing technologies, 47 landslides were detected. 21 landslides were surveyed by field, of which 16 were verified, with an accuracy rate of 71.4%. The results of field survey demonstrated the applicability and feasibility of integrated remote sensing technology in the detection of landslides in southern Ningxia. Meanwhile, and the accuracy of the results in Longde county has been testified. The results of the early detection through integrated remote sensing technology provided significant scientific bases for the landslide protection and emergency response to sudden geological disasters in southern Ningxia.

It is necessary to optimize the pulverizing system to meet the higher and higher requirements of the power generation unit for the pulverizing system. Through the detailed analysis and research of medium speed pulverizer and pulverized coal pipelines, the crux was found and the optimization measures of pulverizer and dynamic leveling method of pulverized coal pipelines were put forward. The concept of flow field in the mill was introduced into the study of pulverizer optimization, through the improvement of the internal structure of the mill, the overall optimization of the internal flow field of the mill was finally realized, so that the performance of pulverizer was comprehensively and substantially improved. The dynamic leveling of pipeline is to measure the flow deviation of air-powder between pipelines in real time by the pressure difference method under the premise of realizing air-powder homogenization in mill, and according to the measurement results to level the resistance between pipelines in real time by the resistance adjustment device on the pipelines, so as to realize the primary air flow equalizing control between pipelines, and finally realize the air-powder equalizing control of the pulverizing system. The technology can effectively improve the adaptability of the pulverizing system to the coal type and realize the dynamic equalizing control of the air-powder.

Researches on the depositional characteristics, evolution and constraining factors of deep-water channel systems are the key factors to reveal the "source-sink" process at continental margin and make big breakthroughs in deep-water hydrocarbon exploration. Based on the integrated analyses of seismic, well logging and core data, a sequence stratigraphic framework was established for the Miocene in block A of the Lower Congo-Congo Fan Basin, and then the sedimentary characteristics, evolution and constraining factors of the Miocene deep-water channel systems were purposed. The Miocene in the study area was divided into four third-order sequences, including the Lower Miocene (SQ1), the lower part of Middle Miocene (SQ2), the upper part of Middle Miocene (SQ3), and the Upper Miocene (SQ4). The Miocene deep-water channel deposits are dominated by sandstones and include four types of sedimentary units (deep-water channel deposits, levee-overbank, lobes and mass transport deposits). In the SQ1, weakly restricted-unrestricted depositional channels and lobes were formed. In the SQ2, weakly restricted erosional-depositional channels were developed. In the SQ3, erosional channels were dominant. In the SQ4, erosional isolated channels were widely recognized. Tectonic uplift, denudation, glacial climate and sea level change provided abundant sediment supplies for the development of gravity flow deposits. They might lead to the slope change of paleo-geomorphology in the study area, which further affected the strength of gravity flow and controlled the development and evolution of deep-water channel systems. Moreover, salt structures played important roles in redirecting, restricting, blocking, migrating and destroying the deep-water channels.

Based on the mechanism of leg joint rehabilitation， a 2URR-SRR-RUPUR four-degree-of-freedom parallel leg rehabilitation robot is proposed， which can realize the abduction and adduction of ankle joint， flexion and extension of knee joint， hip joint abduction and adduction movements and leg stretching movements. Based on the spiral theory， the constrained spiral system and the degree of freedom properties of the mechanism in the general configuration and the initial configuration are analyzed. The kinematics model of the 2URR-SRR-RUPUR parallel mechanism is established. The closed-loop vector method is used to solve the inverse kinematics of the mechanism and the velocity Jacobian matrix of the mechanism is analyzed. On this basis， the working space and singularity of the mechanism are studied， the workspace map and singularity configuration of the mechanism are obtained. The trajectory planning of the mechanism is based on the rehabilitation path of leg joints， and the planning results are analyzed by SolidWorks Motion software. The simulation results show that the movement of the mechanism is continuous and smooth， suitable for leg rehabilitation training and has good application potential.

To understand the evolution of the Miocene gravity flow deposits in the Lower Cong—Congo Fan Basin, this paper documents the Miocene sequence stratigraphic framework, the depositional characteristics and the controlling factors of the gravity flow system. Based on the establishment of high-resolution sequence stratigraphic framework, lithofacies characteristics and sedimentary units of the gravity flow deposits in the region are identified by using seismic, well logging and core data comprehensively, and the sedimentary evolution process is revealed and the controlling factors are discussed. The Miocene can be divided into four 3rd-order sequences (SQ1—SQ4). The gravity flow deposits mainly include siliciclastic rock and pelite. The main sedimentary units include slumping deposits, mass transport deposits (MTD), channel fills, levee-overbank deposits, and frontal lobes. In the Early Miocene (SQ1), mainly gull-wing, weakly restricted to unrestricted depositional channel-overbank complexes and lobes were formed. In the early Middle Miocene (SQ2), W-shaped and weakly restricted erosional-depositional channels (multi-phase superposition) were subsequently developed. In the late Middle Miocene (SQ3), primarily U-shaped and restricted erosional channels were developed. In the Late Miocene (SQ4), largely V-shaped and deeply erosional isolated channels were formed in the study area. Climate cooling and continuous fall of the sea level made the study area change from toe of slope-submarine plain to lower continental slope, middle continental slope and finally to upper continental slope, which in turn affected the strength of the gravity flow. The three times of tectonic uplifting and climate cooling in the West African coast provided abundant sediment supply for the development of gravity flow deposits. Multistage activities of salt structures played important roles in redirecting, restricting, blocking and destroying the gravity flow deposits. Clarifying the characteristics, evolution and controlling factors of the Miocene gravity flow deposits in the Lower Congo—Congo Fan Basin can provide reference for deep-water petroleum exploration in this basin.

Aiming at the application of parallel mechanism in flexible assembly and polishing， a new 6-DOF coupling parallel mechanism is designed. The mechanism branch chain is designed based on the spiral theory， and the branch chain mechanism is optimized for the purpose of improving the rigidity of the mechanism and reducing the motion inertia. The coupled parallel mechanism is decoupled and analyzed according to the fixed principle， and the kinematics and equivalent motion of the mechanism are obtained. The number of degrees of freedom of the mechanism is verified by the modified G-K formula. Finally， a prototype of the coupled parallel mechanism is fabricated， and a motion control experiment is carried out. The experimental results show that the mechanism configuration is reasonable and practical.

Objective The epidemiological characteristics and patterns of foodborne disease events in Nanping City were analyzed to provide a basis for formulating prevention and control strategies of foodborne disease. Methods Foodborne disease incidents reported from all over Nanping City during 1998 and 2017 were collected, and a retrospective descriptive analysis was conducted. Results A total of 184 foodborne disease incidents were reported in Nanping, with 2 871 cases and 40 deaths, with an annual average incidence of 5.12/100 000 and a case fatality rate of 1.39%. The peak season for foodborne illness was the third quarter, with the highest number of incidents and deaths in August. The number of incidents and patients with the largest number were pathogenic microbial events, accounting for 43.48% (80/184) and 64.86% (1 862/2 871) respectively. Toxic plant accounted for 35.87% (66/184) and 10.80% (310/2 871). The most common pathogenic factor was the accidental eating of poisonous mushrooms, accounting for 29.89% (55/184). Vibrio parahaemolyticus was the second factor, accounting for 12.50% (23/184). The most fatal cases were from mushroom, accounting for 87.50% (35/40). Family were the most occurred site, accounted for 39.13% (72/184), and 66.67% (48/72) were caused by toxic plants. Hotels and restaurants accounted for 22.28% (41/184) and 80.49% (33/41) were pathogenic microorganisms. Conclusion The control strategy of foodborne disease events in Nanping should focus on reducing wild mushroom poisoning and changing bad eating habits, carrying out a wide range of food safety education in vulnerable seasons, months and regions, establishing an effective early warning, monitoring and government supervision mechanism, and reducing the occurrence of foodborne disease.

A multi-feature fusion method was proposed,the features of the distortion areas,the distortion edges and the singular value were fused.Firstly,the distortion areas corresponding to the human eyes were obtained by using the parallax and the threshold,and then the average structural similarity in these areas was calculated.Secondly,the distorted edges in the synthetic viewpoint edge image were extracted,and then the average structural similarity was calculated.Thirdly,the difference between the original image and the distorted image singular value was calculated.Finally,the three features were fused to obtain the final objective quality score.The experiment was carried out on the synthetic viewpoint stereo image library.The experimental results show that the Pearson linear correlation coefficient and the Spearman correlation coefficient are both higher than 0.86.Compared with the existing assessment methods,it can better reflect the quality of synthetic viewpoint stereo images.

Spam filtering technology plays a key role in many areas including information security,transmission efficiency,and automatic information classification.However,the emergence of spam affects the user's sense of experience,and can cause unnecessary economic and time loss.The deficiency of spam filtering technology was researched,and a method of spam classification based on naive Bayesian was put forward based on multiple keywords.In the subject of mail,the theme model was used by LDA to get the related subject and keyword of the message,and Word2Vec was further used to search keyword synonyms and related words,extending the keyword collection.In the classification of mails,the transcendental probability of the words in the training dataset was obtained by statistical learning.Based on the extended keyword collection and its probability,the joint probability of a subject and a message was deduced by the Bayesian formula as a basis for the spam judgment.At the same time,the spam filtering system based on topic model was simple and easy to apply.By comparing experiments with other typical spam filtering method,it is proved that the method of spam classification based on theme model and the improved method based on Word2Vec can effectively improve the accuracy of spam filtering.

To solve the challenging problem that the edge regions of image have some remained hazes and blackspots,a novel image dehazing algorithm was proposed based on the minimal color channel and propagated filtering.Firstly,an initial atmospheric transmission map was obtained by double-area filtering,then a minimal channel color was introduced as a reference image,and the propagated filtering was combined to optimize the initial atmospheric transmission map.Optimized transmission have the similar edge characteristics as the referenced image,so the deviation of transmission estimation can be effectively avoided for the edge pixels in the depth mutated regions,and the redundant texture information were removed in the initial transmission map.Finally,L-BFGS was used to restore atmospheric light,and the haze-free image can be recovered based on the atmospheric scattering model.Experimental results show that proposed algorithm has the more accurate transmission estimation for the depth mutated edge regions of image,so the recovered image effectively preserves the edges and details in the depth mutated regions,and has better spatial smoothness in the uniform depth regions.The recovered haze-free image with proposed method has a better sharpness and richer color degree.

Fully-mesh topology test ＆ snake topology test methods on high port density routers were presented. The differences of the test results in latency, jitter, drop, traffic model and so on, were analyzed. The limitation of snake flow test methods in performance test was revealed.