Methods Three on call Helicopter Emergency Medical Service (HEMS) crews (HEMS physician, HEMS crew member and pilot) participated in a simulation exercise on management of a patient with potential symptoms of Ebola virus disease. A HEMS physician trained as a simulation training facilitator facilitated the simulation. Goals for the simulation exercises were: correct management of the patient, c...

With the rapidly increasing demand for high-speed data transmission and a growing number of terminals, massive multiple-input multiple-output (MIMO) has been shown promising to meet the challenges owing to its high spectrum efficiency. Although massive MIMO can efficiently improve the system performance, usage of orthogonal pilots and growing terminals causes large resource consumption especial...

In this paper, we examine an orthogonal frequency division multiplexing (OFDM) system under imperfect channel conditions and pilot-insertion- based estimation. However, unlike conventional pilot-insertion-based estimation, some inserted pilot symbols are set to zero where the index of zero-pilot is employed transmit extra data bits. employ a minimum mean squared error (MMSE) detect transmitted ...

Systems are an important part in today’s science education. Computer simulations have many advantages in teaching science systems. Our research goal is to test whether a hierarchical instructional scaffolding framework embedded in simulation-based learning environments and retrospective mental modeling task could facilitate mental model construction in learning science systems. This pilot study...

With an increased role of modeling and simulation new cockpit technologies can be thoroughly evaluated before being implemented in an aircraft. This process of evaluation, however, needs to be guided by a framework based on our knowledge of the strengths and limitations of the human operator. Situation awareness (SA) has become the dominant construct used in evaluating new technology. However, ...

A pilot plant for continuous flow microwave-assisted chemical reaction combined with microreactors was developed and water heating tests were conducted for evaluation of the developed plant. We developed a microwave apparatus having a single microwave generator that can heat reaction solutions in four reaction fields simultaneously in order to increase throughput. We also designed a four-branch...

A flight control design methodology for alleviating pilot workload during helicopter shipboard operations was developed and tested in simulation. The methodology uses modern MIMO control theory to improve gust rejection properties when operating in a turbulent ship airwake. The spectral properties of the airwake are identified using simulations and incorporated into the control synthesis proces...

A novel frequency domain training sequence and the corresponding carrier frequency offset (CFO) estimator are proposed for orthogonal frequency division multiplexing (OFDM) systems over frequency-selective fading channels. The proposed frequency domain training sequence comprises two types of pilot tones, namely distinctively spaced pilot tones with high energies and uniformly spaced ones with ...

—Massive MIMO has been acknowledged as a promising technology to counter the demand for higher data capacity for wireless networks in 2020 and beyond. However, each Base Station (BS) requires good enough knowledge of Channel State Information (CSI) on both the uplink and the downlink as massive MIMO relies on spatial multiplexing. In Time Division Duplex (TDD) massive MIMO systems, this CSI is...

This paper proposes a carrier phase estimation of a power efficient APSK signal with a honeycombed constellation at a receiver in point-to-multi-point fixed wireless access systems using quasimillimeter frequency band. The signal has a lower amplitude level of a maximum signal vector than a conventional QAM signal. The signal also has a lower average output power. A reference carrier phase of t...