Recognition of flying small target based on enhanced quadratic time-frequency analysis

UAVs (Unmanned Aerial Vehicles, UAVs) are flying targets that sail at low altitudes, are slower and smaller in size. Nowadays, the task of detecting and distinguishing flying small targets is very difficult, so how to efficiently recognize flying small targets in real time is a key issue of current research. In order to solve this problem, this paper proposes a method of using pseudo-WVD and image fusion to represent the characteristics of UAVs. First, the SMMWR (Single-mode millimeter wave radar, SMMWR) equipment is used to collect the echo signals of various types of UAVs, and at the same time, the two-dimensional FFT is used to extract the target micro-motion signals in the distance dimension. Secondly, PWVD is used to generate time-frequency graphs of different window functions. Finally, the images fused based on principal component analysis are sent to AlexNet for training. The result proves that the accuracy of recognition rate based on AlexNet can be 93.75%.

Management of vascular access for extracorporeal life support: A cohort study

Extracorporeal membrane oxygenation (ECMO) is required for patients with refractory cardiac or respiratory failure. Inadequate securement of ECMO cannulae may lead to adverse events, ranging from line kinking to catastrophic accidents, such as air entrainment into the circuit or massive bleeding. Furthermore, the micro-motion of the cannulae at the entry site might increase the risk of local infections. Since 2015, we implemented a written protocol for management of ECMO cannulae and tubing, which specifically includes the securement of each cannula with three sutureless devices. The aim of the present study was to retrospectively assess cannulae micro-motion and the rate of bleeding events at the insertion site. Secondarily we aimed to evaluate the impact of prone positioning maneuvers during ECMO on these events. We performed a single-centre retrospective analysis of prospectively collected data on nursing care of ECMO cannulae. We included adult patients treated with veno-venous (V-V) or veno-arterial (V-A) ECMO between 2015 and 2018 in our general intensive care unit. The distance between the insertion site and the end of the wire-wound part of the cannula was recorded daily. Variations of this distance (defined as “cannula micro-motion”) were recorded. Forty-five ECMO consecutive adult patients (40 V-V and 5 V-A) were included. No accidental cannula dislodgement was recorded. Median daily “cannula micro-motion” was 0.0 (−0.5 to 0.2) cm, without any significant difference between ECMO configuration, cannula type, and insertion site. Twelve patients (26%) presented at least one bleeding episode at cannula insertion site, none of which required surgical intervention. In the subgroup of patients who underwent prone positioning, no difference in cannulae micro-motion was recorded. An ECMO nursing protocol for cannulae management providing sutureless devices for cannula and tubing securement allows safe line stabilization, with the potential to reduce complications related to ECMO vascular access.

ON PSYCHOTHERAPEUTIC TREATMENT OF PHYSICAL TRAUMA CONSEQUENCES IN GESTALT APPROACH PERSPECTIVE. AUTHOR'S METHOD OF MICRO-MOTION REACTIONS RESTORATION (MRR)

Физическая травма и лечение ее последствий в основном находится в сфере задач специалистов-медиков. Но вряд ли мы можем себе представить, что какое-либо физическое воздействие может привести только к телесному повреждению. Фактически, человек сталкивается с рядом психологических последствий, начиная ограничениями, вызванными болью, заканчивая тонкими изменениями в жизненной ситуации и отношениях. Таким образом, можно считать, что пациенты с последствиями физических травм могут успешно получать помощь и у психологов. В статье предлагается и описывается метод восстановления микродвигательных реакций (ВМР). Этот метод основан на принципе дифференциации микродвигательных реакций. В нашем подходе мы используем концепцию «незавершенных дел», происходящую из гештальт-терапии. Метод ВМР позволяет развивать различные разнонаправленные и противоречивые импульсы и реакции, которые были временно остановлены в эпизоде перенесенной физической травмы. Такой вид работы дает каждому незавершенному двигательному импульсу, рожденному во время травмы, полностью развиться. В результате восстанавливается вера в спонтанность движений и увеличивается резилентность пациента. Также в статье представлены три клинических случая, демонстрирующих возможности использования метода ВМР в психотерапевтической работе. Physical trauma and treatment of its consequences basically lies in the domain of medical specialists. But we would hardly imagine that some physical injury may result in bodily impairment only. As a matter of fact, one encounters with a number of psychological consequences from restriction caused by pain to subtle changes in life situation and relationships. Thus, we can consider that patients with physical trauma consequences may be also successfully treated by psychologists. Micro-motion reactions restoration method (MRR) is suggested and described in the article. This method is based on the principle of micro-motion reactions differentiation. In our approach we are using the concept of “unfinished tasks” which originates from Gestalt therapy. The MRR method enables development of various multidirectional and contradictory impulses and reactions that had been temporarily stalled in the episode of past physical trauma. That type of work permits each unfinished motion impulse born during trauma to develop completely. As a result, trust in spontaneity of movement is restored and one’s resilience grows. Also three clinical cases are presented in the article to demonstrate the possibilities of using the MRR method in psychotherapeutic work.

Dynamic evaluation of regional water resources carrying capacity based on set pair analysis and partial connection number

In order to describe the micro motion between the connection number components and seek a more applicable evaluation model, quantitatively evaluate and analyze regional water resources carrying capacity (WRCC). Firstly, an evaluation index system and grade standards of regional WRCC were constructed. Then, a method for determining the connection number was proposed, which considered the micro motion between the connection number components in system structure. Finally, built an evaluation model based on set pair analysis (SPA) and partial connection number (PCN) that used subtraction set pair potential (SPP) to identify vulnerability factors, and identification results were compared with total partial connection number (TPCN). The model was applied to Huaibei City, Anhui Province, China. The results showed that: the WRCC grade value was between 2 and 3 that was poor; the support and regulation subsystem grade value was between 2 and 3, and the pressure subsystem grade value was between 1 and 2. SPP identified that the support force and regulation force subsystem were the vulnerable subsystems. Eight indexes such as water resources per capita, rate of ecological water consumption and density of population were the main indicators causing the poor WRCC, which were in good agreement with the local measured data. In addition, the SPP and TPCN are compared to further verify rationality of the connection number determination method and reliability of the identification results. The model established in this paper has strong applicability and can also be used for the dynamic evaluation of other resources, environment and ecological carrying capacity. The results in this study can provide a scientific basis for water resources management and decision-making.

Micro-Motion Parameter Extraction for Ballistic Missile with Wideband Radar Using Improved Ensemble EMD Method

Micro-motion parameters extraction is crucial in recognizing ballistic missiles with a wideband radar. It is known that the phase-derived range (PDR) method can provide a sub-wavelength level accuracy. However, it is sensitive and unstable when the signal-to-noise ratio (SNR) is low. In this paper, an improved PDR method is proposed to reduce the impacts of low SNRs. First, the high range resolution profile (HRRP) is divided into a series of segments so that each segment contains a single scattering point. Then, the peak values of each segment are viewed as non-stationary signals, which are further decomposed into a series of intrinsic mode functions (IMFs) with different energy, using the ensemble empirical mode decomposition with the complementary adaptive noise (EEMDCAN) method. In the EEMDCAN decomposition, positive and negative adaptive noise pairs are added to each IMF layer to effectively eliminate the mode-mixing phenomenon that exists in the original empirical mode decomposition (EMD) method. An energy threshold is designed to select proper IMFs to reconstruct the envelop for high estimation accuracy and low noise effects. Finally, the least-square algorithm is used to do the ambiguous phases unwrapping to obtain the micro-curve, which can be further used to estimate the micro-motion parameters of the warhead. Simulation results show that the proposed method performs well with SNR at −5 dB with an accuracy level of sub-wavelength.