53 results about "Field training" patented technology

The invention discloses a power industry large model continuous pre-training method and system based on dynamic self-constraint, and belongs to the technical field of artificial intelligence, and the method comprises the steps: obtaining industry pre-training corpora and instruction training corpora, dynamically adjusting the mixing ratio of the industry pre-training corpora and the instruction training corpora through a curriculum-type strategy, and obtaining an industry pre-training corpora and an instruction training corpora; obtaining a dynamic mixed data set; configuring a reference model based on the dynamic mixed data set, and training a target power industry large model by adopting a differential loss function and the reference model for different types of data in the dynamic mixed data set; according to the differential loss function, self-adaptive KL divergence is calculated according to inter-partition optimization logic, and the self-adaptive KL divergence is adopted to construct a loss function; and obtaining the probability of the reference model through an online reasoning framework, and enabling the training to be continuously carried out based on the probability of the reference model. According to the method, the knowledge conflict problem in professional field training is effectively solved, and the generality of the model is kept while the professional property of the power field is improved.

The invention provides a training method and device of a hybrid expert model, electronic equipment and a storage medium, belongs to the technical field of large language models, and improves the reasoning efficiency and deployment flexibility of a first preset hybrid expert model by converting a feedforward neural network into a plurality of expert units. And training the plurality of output probabilities to be the same through the multi-field training sample, so that the second preset hybrid expert model can be quickly converged. And the output probability is trained again through a multi-field training sample, so that the performance of the gating layer is further optimized. And training the third preset hybrid expert model through the single-field training sample, so that the hybrid expert model achieves the optimal performance in the specific field. According to the invention, the feedforward neural network is converted into a plurality of expert units, and then three different levels of training are carried out on the gating layer, so that the training efficiency of the hybrid expert model is improved, and the data processing precision and robustness of the hybrid expert model in a specific field are also improved.

The invention discloses a data matching method and device. Based on a gradient estimation principle, the method is used for adjusting the proportion of training data of different sources in a fine adjustment stage of a large model in a professional field. And matching the field training data and the general training data according to a first proportion related to the requirements of the professional field to obtain mixed training data. The method is used for fine tuning of the large model, and the accuracy of the fine-tuned large model is calculated. And adjusting the first proportion, and obtaining two reference accuracy rates based on the adjusted first proportion. According to comparison between the reference accuracy rate and the accuracy rate and between the two reference accuracy rates, the accuracy rate change trend of the large model after the proportion is adjusted is analyzed, the gradient direction is estimated, and the target proportion is obtained. And through scientific simulation and gradient change analysis, an ideal proportion is efficiently determined. It is ensured that the large model shows the best accuracy in the general and professional fields, and the high-level performance of the general task is maintained while the performance of the professional field is enhanced.

The invention discloses a field operation portable folding type self-fire-making cooker, relates to the technical field of food processing equipment, and aims to solve the problems that in the prior art, during field operation training, a cooker is not convenient to carry, and additional fire-making energy needs to be arranged, the field operation portable folding type self-fire-making cooker comprises a base, a heating plate is embedded in the base, and a foldable cooker wall is placed on the heating plate; a cooker cover is arranged at the top of the foldable cooker wall in a matched mode, a convex lens used for making a fire by utilizing solar energy is arranged above the cooker cover, a grip assembly and a plurality of supports are connected to the base in the circumferential direction in a rotating mode, a containing groove is formed in the lower portion of the base, and the grip assembly can be contained in the containing groove in a rotating mode. The device has the characteristics of compact structure, light weight, simplicity and convenience in operation, self-ignition, rapid heating and the like.

The invention belongs to the technical field of medical instruments, particularly relates to field training protection and medical transfer equipment and a use method thereof, and provides the following scheme aiming at the problems that in the prior art, arms and legs cannot be effectively protected, and transfer of trainees is not convenient, the field training protection and medical transfer equipment comprises two first protection plates and a second protection plate, first rotating shafts are fixed to the sides, away from each other, of the two second protection plates, the two first protection plates are rotationally arranged on the outer walls of the corresponding first rotating shafts in a sleeving mode correspondingly, and second rotating shafts rotationally penetrate through the interiors of the two second protection plates correspondingly. The risk that the legs of a user are injured during rolling is reduced, when the wounded needs to be transferred, the first protection plate, the second protection plate and the first fixing shaft form a whole, a simple stretcher is formed, the wounded can be transferred easily, and physical exhaustion of medical staff is reduced.

The simple and portable walking stick for field training comprises a main pipe body, a first supporting gear, a second supporting gear and an expansion piece, the first supporting gear is installed on the upper half portion of the main pipe body in a downward folding mode, sponge is arranged on the first supporting gear, a groove is formed in the lower surface of the first supporting gear, and the expansion piece is arranged in the groove. The second supporting gear is folded upwards to be installed on the main pipe body and located below the first supporting gear, the first supporting rod is installed between the first supporting gear and the second supporting gear, the supporting frame is hinged to the first supporting rod, the expansion piece is connected with the main pipe body through threads, and the expansion piece is composed of a second supporting rod section and a third supporting rod section. The utility model relates to the field of field tools, in particular to a simple and portable walking stick for field training.

The sleeping bag comprises a sleeping bag body, the interior of the sleeping bag body is of a multi-layer structure, a zipper used for opening and closing the sleeping bag is arranged on the right side of the sleeping bag body, a heating assembly is arranged on the inner layer of a bottom piece of the sleeping bag body, and the heating assembly is connected with a power interface through a temperature adjusting device; a linear neck guard is arranged on a bottom piece of the sleeping bag body, a U-shaped neck guard is arranged on an upper piece of the sleeping bag body, and an adjusting rope is arranged at a neckline of the sleeping bag body. The heatable sleeping bag with the multi-layer structure has the functions of wind prevention, heating, warm keeping and the like, and the warm keeping requirement of camping in a cold environment is met. As a military product, the sleeping bag is mainly suitable for troops to use during field training and actual combat camping; and the quilt can also be used as a civil product, such as a sleeping tool during travel and camping, and has windproof and warm-keeping functions.

The utility model belongs to the technical field of teaching aids, and particularly relates to an industrial internet practical training platform which comprises a practical training counter, and a back vertical plate is arranged on the rear edge of the platform surface of the practical training counter. A plurality of mounting holes are formed in the back vertical plate; accessories for field training are fixed on the front side of the back vertical plate, the table top of the practical training counter or in the practical training counter; the PLC arranged on the front side of the back vertical plate and a part of accessories are connected and fixed through screws penetrating through the mounting holes. According to the practical training counter in the scheme, due to the fact that the multiple installation holes are formed in the back vertical plate, installation of various accessories for field training can be met, a user can freely match the accessories according to items to be trained, different systems such as a sorting system, an electrical control system, a traffic light system and a constant temperature control system are formed, and the practical training counter is convenient to use. Therefore, the requirement of field teaching of the plc automatic control technology is met.

The invention discloses a special soldier function detection and treatment rehabilitation vehicle under a field operation training condition. A safety certification module is mainly an individual combat safety identity recognition device comprising a combat identity label and a safety identity recognition plate; the function detection module is provided with a plurality of annular operation surfaces with different heights on a common environment circular experiment table, a plurality of independent operation compartments with movable operation cover plates are arranged in the middle of a ladder type operation surface of a barrier environment experiment table, and the treatment and rehabilitation module is provided with a frame-shaped structure for placing treatment supplies and configuring functional supplies. The function rehabilitation platform is provided with a stretcher face formed by hard stretcher plates capable of being integrally folded, a circular ring and lock catch combination device at the top of a supporting rod is connected with a function rehabilitation assembly, the treatment platform is provided with a liquid resuscitation combined type grading pipeline device, a liquid regulator is of a closed split-grid cell structure for containing a plurality of sets of transfer pipelines, and split grids are provided with heating devices. And a wireless terminal is fixedly arranged on the outer side of the liquid regulator. The device is safe and integrated, is convenient to use, and can guarantee the special soldier treatment and rehabilitation operation process.

The invention provides a method, device and equipment for generating a large network cutover model, and the method comprises the steps: collecting cutover corpora, carrying out the similarity corpus deduplication and semantic complementation cleaning of the collected corpora, and storing the collected corpora as a document in a word or pdf format; the method comprises the following steps of: labeling a stored document in a mode of combining manual labeling and intelligent labeling, and outputting a labeled sample in a json format according to a labeling result which is a question-answer pair of input and output; taking the labeled sample as a professional field training sample, extracting data from the open source labeled sample as a general sample, and mixing the professional field training sample and the general sample as a final training sample; an open source large model is used as a pre-training model, a final training sample is used to carry out SFT fine tuning through a lora method, a cutover large model is generated, and the generated cutover large model is evaluated by constructing a cutover knowledge question library and a cutover large model answer score.

The utility model relates to the technical field of outdoor knapsack processing and manufacturing, in particular to a field training knapsack which is reasonable in structure, stable in carrying, simple and convenient to operate, labor-saving in carrying and anti-fatigue, is provided with a knapsack main body, and double shoulder straps are arranged on the back surface of the knapsack main body, and is characterized in that an interlayer with an inserting channel is arranged on the back surface of the knapsack main body; and an insertion plate is arranged in the interlayer with the insertion channel.

The invention relates to a three-dimensional velocity field multivariate nonlinear regression method and device based on deep learning. The method comprises the following steps: acquiring velocity field training set data formed by four characteristics of an X coordinate, a Y coordinate, time and velocity; preprocessing (i.e., standardizing) the training set data to enable the training set data to meet normal distribution; a DNN model is built and trained, and when the error between the prediction speed and the label speed is smaller than a certain threshold value, it can be considered that training of the DNN model is completed; and predicting each CMP point by using the trained DNN model to obtain a three-dimensional seismic exploration velocity field after interpolation and extrapolation of the whole region. The speed control point density and the manual picking time can be effectively reduced, and the picking precision comparable with that of manual picking is achieved, so that the data processing cost is reduced.

The utility model relates to the technical field of infusion supports. The movable infusion support convenient to fix comprises a supporting mechanism, a storage mechanism is arranged at the upper end of the supporting mechanism, and a telescopic mechanism is arranged in the storage mechanism. The telescopic rod is pulled upwards in the fixed rod, so that the insertion rod is driven to move through the elasticity of the spring, and one end of the insertion rod is inserted into the insertion groove, so that the positions of the fixed rod and the telescopic rod are fixed, and the equipment can be quickly telescopically fixed; the device can meet high efficiency required by troops, can be quickly used in outdoor training of the troops, and improves the convenience to a certain extent.

The present invention provides a field training device suitable for javelin throwing practice, comprising: a gantry, which is symmetrically arranged with respect to each other and fixedly connected by a plurality of connecting frames. The gantry comprises two symmetrical main columns, which are fixedly connected by two groups of gantry trusses, and the surfaces of the main columns are movably sleeved with column sliding sleeves. By arranging a traction shoulder-turning mechanism and a throwing mechanism at both ends of the gantry, the present invention can respectively carry out torso training and throwing training, can accommodate multiple people for training at the same time, increase the training types of the training equipment, and carry out multiple types of training without interfering with each other.

This invention relates to the field of reliability assessment technology for electric vehicle charging equipment, specifically disclosing a method for predicting the lifespan of charging connectors by integrating accelerated life testing and field data. The method includes: constructing a laboratory lifespan dataset and a field dataset; preprocessing the two types of data and converting the laboratory degradation time into equivalent field usage time using an acceleration factor model; pre-training a priori lifespan inference model using the preprocessed laboratory data, synthetic data, and the mapped equivalent field time; inputting historical data of the target device into the priori lifespan inference model and directly outputting the lifespan prediction result; and using the lifespan prediction result for operation and maintenance decisions. This invention uses laboratory accelerated life testing as the main data source, combines a small amount of field data, and can infer lifespan status without field training. It can model the lifespan degradation of key components of charging guns under complex operating conditions, predict remaining lifespan, and assess failure risk.

The present invention relates to an intelligent snowboard training device and training method, the device comprising: a frame; a walking mechanism, comprising a first drive unit and a second drive unit relatively arranged on two sides of the frame; a training board, the two ends of the training board are respectively connected to the first drive unit and the second drive unit, the first drive unit and the second drive unit can respectively and independently control the two ends of the training board to move along the length direction of the frame; a telescopic mechanism, arranged between the first drive unit and the second drive unit, for controlling and limiting the distance between the first drive unit and the second drive unit, so that the distance is adapted to the inclination of the training board; the purpose is to enable trainees to perform skiing simulation training through the device, and then conduct field training, thereby reducing the risk of trainees being injured during training, and more importantly, improving the speed of trainees learning various skiing movements and skills, so as to achieve twice the result with half the effort.

The utility model provides a management and control panel assembly convenient for field training, which comprises a panel main body assembly, the panel main body assembly comprises a shell, a camera is fixedly mounted on the surface of the front end of the shell, a button is movably mounted at the bottom of the surface of the front end of the shell, a clamping groove is formed in the side edge of the shell, and a connecting assembly is arranged at the rear end of the shell. The holding assembly is arranged on the surface of the connecting base, the supporting assembly is arranged in the connecting base and comprises a supporting plate and a solar panel, and the fixing assembly is arranged on the surface of the connecting base. According to the management and control panel assembly facilitating field training, the shell can be clamped to the hand of a trainee by pulling the holding assembly, the placement angle of the shell can be changed by rotating the connecting assembly and the supporting assembly and fixing the shell through the fixing assembly, and therefore the trainee can operate the management and control panel assembly conveniently; and solar energy can be absorbed by the solar panel, so that the cruising ability of the shell is improved, and the training personnel can smoothly complete the task.

The application discloses a kind of based on big language model's molecular sieve vertical field intelligent system construction method, its characteristics are that the method includes: structure data standardization and literature information extraction, inject field knowledge and tool call specification by supervision fine tuning, carry out reinforcement learning training using GRPO group relative strategy optimization algorithm and multidimensional reward function, construct GNN graph neural network agent model, realize millisecond level property prediction and uncertainty quantification, and system deployment based on asynchronous scheduling and multistage cache etc. steps.Compared with the prior art, the application has the functions of knowledge question and answer, property prediction, reverse design and synthesis planning in the field of molecular sieve, the monomer big language model internalizes professional knowledge through deep field training, uses GNN agent model as the reward signal source of reinforcement learning to greatly improve the training efficiency, balances response speed and calculation accuracy using native Function Call capability, the method is innovative, the system is complete, and has a broad prospect of material research and application.

1. The name of the design product: graphical user interface of insurance industry field training system for mobile phone. 2. The use of the design product: for running programs. 3. The design points of the design product: the graphical user interface content displayed on the mobile phone. 4. The picture or photo that best indicates the design points: design 1 front view. 5. The mobile phone is a conventional design, and the other views of design 1 and design 2 are omitted. 6. Design 1 is designated as the basic design. 7. The use of the graphical user interface: for insurance industry field training system, and the design 1 front view is the medal display page. Click "view all 32" on the right side of the design 1 front view to jump to design 1 interface change state diagram 1; click the "621 master" button in the lower right corner of design 1 interface change state diagram 1 to jump to design 1 interface change state diagram 2; and the design 2 front view is the work standard interface. Click the "work standard" button above the design 2 front view to jump to design 2 interface change state diagram 1; click the "visit one customer a day" button in the middle of design 2 interface change state diagram 1 to jump to design 2 interface change state diagram 2.

The invention provides a cross-domain ship large model training method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: acquiring a field training data set of a plurality of fields involved in a ship design whole process; training each subdivided professional adaptation layer of each field in parallel by adopting the field training data set of each field to obtain each trained professional adaptation layer of each field; generating a full-domain adapter based on each trained professional adaptation layer of each domain, and loading the full-domain adapter to the basic large language model to form an initial ship large model; and obtaining a cross-domain training data set and a professional training data set, and performing fine adjustment on the initial ship large model by using the cross-domain training data set and the professional training data set until a preset condition is met, thereby obtaining a final ship large model. By the adoption of the method, accurate and reliable response can be made to cross-domain tasks in the whole ship design process.

The invention discloses an army officer and soldier mental health classification method in the technical field of mental health, and the method comprises the following specific steps: 1, obtaining psychological values A of a plurality of samples and a plurality of sample feature value matrixes I, the psychological values A being 0 or 1; step 2, storing a plurality of psychological values A and a plurality of sample characteristic value matrixes I in a table form; step 3, carrying out standardization processing on the sample characteristic value matrix I after the label listing, extracting principal component characteristics based on principal component analysis, and then selecting characteristic vectors corresponding to the first k maximum characteristic values to form a transformation matrix; and step 4, performing model training for the dichotomy task, finally predicting principal component features of the test set, and outputting a probability value or a category label of the mental health state. According to the method, through combination of principal component analysis and machine learning, high-dimensional feature dimension reduction and automatic risk prediction are realized, and the method is suitable for mental health classification in army officer and soldier training, resident training and task deployment scenes.

The utility model provides a logistical support box with a toilet and a logistical support vehicle, the logistical support box comprises a support box body, and a plurality of urinals, wash basins and squatting pans are arranged in the support box body; the clean water tank is connected with water inlets of the urinal, the squatting urinal and the hand washing sink, and the treatment water tank is connected with water inlets of the urinal and the squatting urinal; the logistics support box further comprises a vacuum dirt collecting device and a simple environmental control life support device, a pretreatment device is arranged at the front end of the simple environmental control life support device, and when officers and soldiers carry out field training in the water-deficient area for a long time, through the structure, waste of clear water can be reduced, and the service time of the logistics support box is prolonged; and by using the logistics support box, the defecation problem of male and female officers and soldiers can be solved.

The utility model relates to an oxygen generation vehicle suitable for being used in high-altitude regions. The oxygen generation vehicle comprises an oxygen uptake chamber, a filling chamber, an equipment chamber and a power generation chamber. The oxygen generation vehicle is provided with a generator, an oxygen generator, a filling machine, a dispersed oxygen outlet, a nasal suction pipe, an oxygen uptake and filling oxygen bottle and an oxygen bag, can achieve the functions of oxygen generation, filling, oxygen storage, oxygen uptake and the like anytime and anywhere, is provided with a vehicle-mounted forklift, can carry materials and remove obstacles and rescue, and is further suitable for field training and fire rescue in high-altitude regions. Wherein the suction dryer in the equipment room effectively removes air moisture, and is not easy to freeze under the cooperation of the air compressor and the heater, so that the environment adaptability is stronger; the control panel independently mounted in the filling chamber has good electrical safety performance, and all equipment control switches can be concentrated in the control panel and are easy to operate; air quality adjustment and temperature adjustment are carried out in the oxygen uptake chamber through the fan heater and the air conditioner, and the comfort degree of oxygen uptake personnel is improved.

The utility model relates to the technical field of subway training equipment, in particular to signal indication simulation equipment. Comprising an annunciator module and a Ps disk module, and the annunciator module is located at one end of the Ps disk module; the signal machine module comprises five signal lamps and a remote control module, the five signal lamps emit red, yellow, green, blue and white respectively, one end of each signal lamp is connected with the remote control module, the remote control module is connected with the power supply, and the remote control module is provided with a plurality of com ends and a plurality of no ends; one end of the yellow signal lamp is connected with the no interface of the channel 1 of the remote control module through a wire. According to the signal indication simulation equipment provided by the utility model, the emergency capability of a subway driver can be improved by using the equipment, the equipment can be used without a repeated laying process, the equipment can be used only by being installed at a field training site, and the equipment can be taken back after being used, so that the equipment is convenient and rapid; and the method is convenient to operate and has certain economic value and actual use value.

The present invention discloses a method and system for fusion of virtual and real in a very large space based on a metaverse, and relates to the technical field of fusion of virtual and real, including: obtaining continuous video frame images as scene training data, using a key frame detection method to obtain global features in real time for the scene training data, setting similarity thresholds for adjacent video frame images according to the global features, and obtaining local parameters of the real-time scene; using a multi-scale space detection algorithm to obtain key feature points for the local parameters, calculating the scene depth value of the video frame image through the key feature points, and obtaining scene fusion data; performing feature extraction on the scene fusion data, obtaining overlapping texture data, and using a texture weighting method to fuse adjacent overlapping areas of the images, and obtaining virtual and real fusion scene data, which can effectively reduce texture distortion, ensure that the monitoring video after the camera parameters change is automatically fused with the three-dimensional virtual scene in real time, and avoid tedious manual operations and lags.

The invention discloses a portable handheld Beidou trainer which comprises a handheld Beidou host and a host supporting frame and further comprises an arm-worn quick-release structure, the arm-worn quick-release structure comprises an elastic fixing band, and the two ends of the elastic fixing band can sequentially penetrate through a wearing opening from the inner side of a groove and extend to the outside of a shell. The extending end part of the hook-and-loop fastener is provided with a hook-and-loop fastener male surface and a hook-and-loop fastener female surface which are mutually matched. According to the invention, flexible switching of three use modes is realized through an innovatively designed arm-worn quick-release structure, through cooperation of a wearing groove, a wearing port and an elastic fixing band, the equipment can be held by hand for operation, and can be quickly fixed on an arm to realize mobile observation without two hands, and static fixed teaching can be carried out through a support frame, so that the teaching efficiency is improved. According to the multi-mode design, seamless connection of classroom learning, field training and equipment protection is achieved in Beidou teaching equipment for the first time, students can still continuously observe the state of the equipment in tactical actions such as advancing and climbing, and the actual combat level and the teaching effect of training are remarkably improved.

The present invention discloses a method and system for real-time active adjustment of the surface accuracy of a large planar SAR antenna in orbit. Through in-orbit real-time temperature field training of the rod system errors, the coupling influence law between the orbital thermal environment, the rod system assembly and adjustment errors, and the surface accuracy of the SAR antenna is determined. Through the learning and training of the in-orbit real-time temperature field, the real-time prediction of the thermal deformation and surface accuracy of the SAR antenna at any angle and position during in-orbit operation is realized. At the same time, by studying the coupling law of the in-orbit temperature field and the rod system assembly and adjustment errors on the surface accuracy, the use of deep learning algorithms and optimization algorithms can achieve "prediction - adjustment - optimization - re-prediction - re-adjustment" of the surface accuracy of the SAR antenna at different times and positions during in-orbit operation, realizing the active prediction and adjustment of the in-orbit surface accuracy.

The utility model relates to the technical field of equipment box adjustment, and particularly discloses a portable foldable field training equipment box support adjusting device which comprises an equipment box body, one side of the top of the equipment box body is connected with a sealing cover through a hinge, and two electric telescopic rods are fixedly connected into the equipment box body. The top ends of the two sides of the inner side wall of the equipment box body are fixedly connected with bearing plates through fixing shafts, the surfaces of first connecting shafts are rotationally connected with stabilizing plates, the surfaces of the fixing shafts are rotationally connected with lifting plates, and one side of the top of a first placing plate is connected with a second placing plate through a hinge. The lifting plate, the electric telescopic rod, the first connecting shaft, the ejector rod, the first placing plate, the first bevel gear and the bearing block are matched for use, so that when the equipment box body is used, training articles can be placed on the first placing plate and the second placing plate in the equipment box body, and meanwhile, the heights of the two placing plates can be adjusted; the requirements of different trainees for heights are met, and the flexibility is high.

The utility model discloses a multilayer structure heatable sleeping bag which comprises a sleeping bag body, the interior of the sleeping bag body is of a multilayer structure, a zipper used for opening and closing the sleeping bag is arranged on the right side of the sleeping bag body, a heating assembly is arranged on the inner layer of a bottom piece of the sleeping bag body, and the heating assembly is connected with a power interface through a temperature adjusting device. A linear neck guard is arranged on a bottom piece of the sleeping bag body, a U-shaped neck guard is arranged on an upper piece of the sleeping bag body, and an adjusting rope is arranged at a neckline of the sleeping bag body. The heatable sleeping bag with the multi-layer structure has the functions of wind prevention, heating, warm keeping and the like, and the warm keeping requirement of camping in a cold environment is met. As a military product, the sleeping bag is mainly suitable for troops to use during field training and actual combat camping; and the quilt can also be used as a civil product, such as a sleeping tool during travel and camping, and has windproof and warm-keeping functions.

The utility model discloses a target box with reset folding, comprising main frame, by a plurality of metal pipe detachable type sleeve joint is formed, and the frame structure of the outer contour is four square. The target box passes through the design of detachable metal pipe main frame and the vice frame of ribbon or rope or magic tape fixed, has improved portability and assembly efficiency obviously. Main frame is by a plurality of metal pipe detachable type sleeve joint is formed, and the frame structure of the outer contour is four square, and the weight is light and dismounts simple and easy, is suitable for field training or quick deployment scene. The vice frame is connected with the main frame diagonally through the ribbon or rope or magic tape, and the installation is flexible, and the space is small after dismounting. The cloth cover is wrapped frame and is fixed through the ribbon or rope or magic tape, and the compactness of overall structure is further enhanced, and transportation and storage are convenient.