FORMING SIGNALS OF CURRENT TRAJECTORIES IN COMPUTER-AIDED SYSTEM OF MODAL CONTROLLING UNMANNED VEHICLES IN OPEN PIT MINING

The article defines the object of control in the form of signals of current trajectories (CT), along which unmanned vehicles (UMV) move. It describes the subject field of research – the principle and technology of forming the signals generated by the computer-aided system for modal controlling the UMVs during their movement along quarry routes. In order to develop procedures for identifying an upcoming trajectory of the UMV when bypassing some static or dynamic obsta-cles, conditions are included in the software and hardware complex for the formation of the UMV corresponding trajectory direction based on assigned sinusoidal-like frequency-time-dependent functions (chirp signals) responsible for redirecting the UMV along a particular trajectory. The cor-responding chirp signals for the left and right deviation trajectories of the UMV are fixed. The no-tion of sporadic disturbances and force-modal transient processes (TP) is introduced. There has been also reviewed a new description of TP, whose signal contains the variable frequency changing by a certain law depending on the direction and nature of a CT deviation and the environment of UMV. The essence and reasons for the effects of structural and parametric nonstationarity of the control object (CO) are explained. Analytical and graphical interpretations of the emerging non-stationarity caused by the introduction of additional stationary and dynamic-type poles into the CO are presented. It is noted that the stationary poles characterize the inertia of the aperiodic components of the trajectory chirp signals, and the dynamic ones determine the permanently varied frequency of transients (their chirp form). The properties of both sporadic and forced-modal TPs’ poles localized on the complex plane are characterized. Calibration characteristics are determined that establish a relationship between the instantaneous frequency of TP and the metric deviation of UMV CT relative to the nominal axial trajectory. The difference between the procedures of localization and re-localization of poles for modal upward and downward reverse TP, on which the efficiency and safety of UMV moving along the quarry routes, depends, is functionally identified and considered. All the procedures mentioned above make it possible to monitor online and control effectively the dynamics of operative and safe UMV trajectory moving along technological quarry routes in open pit mining

Dynamics of Stone Habitats in Coastal Waters of the Southwestern Baltic Sea (Hohwacht Bay)

Cobbles and boulders on the seafloor are of high ecological value in their function as habitats for a variety of benthic species, contributing to biodiversity and productivity in marine environments. We investigate the origin, physical shape, and structure of habitat-forming cobbles and boulders and reflect on their dynamics in coastal environments of the southwestern Baltic Sea. Stone habitats are not limited to lag deposits and cannot be sufficiently described as static environments, as different dynamic processes lead to changes within the physical habitat structure and create new habitats in spatially disparate areas. Dynamic processes such as (a) ongoing exposure of cobbles and boulders from glacial till, (b) continuous overturning of cobbles, and (c) the migration of cobbles need to be considered. A distinction between allochthonous and autochthonous habitats is suggested. The genesis of sediment types indicates that stone habitats are restricted to their source (glacial till), but hydrodynamic processes induce a redistribution of individual cobbles, leading to the development of new coastal habitats. Thus, coastal stone habitats need to be regarded as dynamic and are changing on a large bandwidth of timescales. In general, wave-induced processes changing the physical structure of these habitats do not occur separately but rather act simultaneously, leading to a dynamic type of habitat.

FEASIBILITY STUDY FOR THE USE OF NATURAL MORDENITE IN PURIFICATION PROCESSES OF WASTEWATERS FROM PHARMACEUTICAL POLLUTANTS

The present research concerns the possibility of adsorptive removal of the frequently used antibiotics – moxifloxacin and norfloxacin on natural zeolites – mordenite and its acid-modified form from aqueous solutions. The adsorption of the above-mentioned antibiotics on the selected natural zeolite samples was investigated under static and dynamic conditions. Adsorption experiment under dynamic conditions carried out using the specially constructed dynamic type of laboratory equipment. Based on the data of chemical, IR spectroscopic, X-ray diffraction analyses, it has shown that when the zeolite adsorbent is treated with an acid, an equivalent exchange of extra framework cations for a hydrogen ion and dealumination occurs and silanol groups are formed at the same time. The increase in the adsorption activity of mordenite as a result of its treatment with acid is associated with an increase in the pore size due to the unblocking of the adsorbent aluminosilicate framework channels during dealumination.

Dynamic Type Matching

Problem definition: We consider an intermediary’s problem of dynamically matching demand and supply of heterogeneous types in a periodic-review fashion. Specifically, there are two disjoint sets of demand and supply types, and a reward for each possible matching of a demand type and a supply type. In each period, demand and supply of various types arrive in random quantities. The platform decides on the optimal matching policy to maximize the expected total discounted rewards, given that unmatched demand and supply may incur waiting or holding costs, and will be fully or partially carried over to the next period. Academic/practical relevance: The problem is crucial to many intermediaries who manage matchings centrally in a sharing economy. Methodology: We formulate the problem as a dynamic program. We explore the structural properties of the optimal policy and propose heuristic policies. Results: We provide sufficient conditions on matching rewards such that the optimal matching policy follows a priority hierarchy among possible matching pairs. We show that those conditions are satisfied by vertically and unidirectionally horizontally differentiated types, for which quality and distance determine priority, respectively. Managerial implications: The priority property simplifies the matching decision within a period, and the trade-off reduces to a choice between matching in the current period and that in the future. Then the optimal matching policy has a match-down-to structure when considering a specific pair of demand and supply types in the priority hierarchy.

A Conditional Generative Adversarial Network Based Approach for Network Slicing in Heterogeneous Vehicular Networks

Heterogeneous Vehicular Network (HetVNET) is a highly dynamic type of network that changes very quickly. Regarding this feature of HetVNETs and the emerging notion of network slicing in 5G technology, we propose a hybrid intelligent Software-Defined Network (SDN) and Network Functions Virtualization (NFV) based architecture. In this paper, we apply Conditional Generative Adversarial Network (CGAN) to augment the information of successful network scenarios that are related to network congestion and dynamicity. The results show that the proposed CGAN can be trained in order to generate valuable data. The generated data are similar to the real data and they can be used in blueprints of HetVNET slices.