[Purpose] Scapular stabilizer strengthening exercise is crucial for shoulder rehabilitation. The purpose of this study was to compare two types push-up plus exercises, on a stable and unstable bases support, using surface electromyography (EMG), suggest an effective rehabilitation program. [Subjects Methods] Ten healthy men volunteered study. All volunteers performed sets (standard push up knee up) support. muscle activities five important scapular muscles (upper trapezius, middle lower...

[Purpose] This study was to examine the effects of tai chi on low back pain in young males. [Subjects and Methods] Forty males their 20s with were randomly assigned two groups. Tai applied one group, stretching other group. The subjects conducted exercise for hour, three times per week four weeks. They performed warm-up exercises 10 min at beginning end sessions main 40 minutes. Wireless surface electromyography (sEMG) a visual analogue scale (VAS) employed measure muscle activity pain,...

This paper describes a novel active inductor using common-source cascode FET with an inductive feedback. A compact lossy inductor, which consists of and feedback resistor, was used as the to achieve high Q-factor tunability, well reduce chip size. The fabricated achieved more than 100 Q-factors maximum value 3400 over frequency range 200 MHz, in vicinity 1.7 GHz. Inductance tuned from 9.6 56 nH at GHz by variation resistance inductor. Using this (as frequency-selective element resonator),...

As the workload and speed of a computer system increase, both data bandwidth capacity main memory inevitably need to grow. However, number slots per channel is limited maintain high bandwidth, making requirement difficult meet. Another problem that systems impose limit on supply power since their dissipation increases rapidly where memories account for roughly 15% total consumption. To address these issues, we design 4Gb DDR3 SDRAM supports 1.2 V voltage 1.6 Gb/s rate.

This study introduces a new method for precise timing estimation in OFDM systems. In multipath channels, conventional correlation-based methods experience performance degradation due to channel dispersion. Based on symmetric correlation property of preamble, the proposed is developed exploit statistical change correlator generalized likelihood ratio framework. While achieving superior environments, does not require any knowledge SNR and statistics. Simulation results confirm that suitable...

Underwater acoustic networks have recently risen as an effective support to several marine and oceanic applications. However, the potential presence of a large number nodes simultaneously connected has pushed scientific community address matter communication resources management, hence provide best possible performance for each link. Since underwater communications (UWACs) suffer from limited bandwidth long propagation delays, medium access control results really challenging. The known...

Two different kinds of resonators can be used to construct a microwave band-pass filter that has low spurious response. The made with coaxial and disk dielectric shows good

As a promising candidate to replace cyclic prefixed orthogonal frequency division multiplexing (CP-OFDM), new quadrature amplitude modulation filter-bank multi-carrier (QAM-FBMC) has been proposed for enabling spectral efficiency increase and spectrum confinement while keeping near orthogonality. QAM transmission can combat intrinsic interference of conventional offset-QAM (OQAM)-FBMC, which is main bottleneck in channel estimator multiple antenna transceiver design. Compared existing single...

In this paper, we investigate the performance of HFM signals for timing synchronization in underwater acoustic communication systems. The considered are comprised up-sweep and down-sweep having different bandwidth. proposed is then evaluated numerically using channel model constructed based on western sea South Korea. Numerical analysis suggests design achieving good presence Doppler scale.

Underwater acoustic (UWA) communications systems suffer from a low signal-to-noise ratio (SNR) and doubly selective channel, which are caused by many limitations, such as high propagation loss, slow speed, time-varying environmental factors. To overcome SNR, various diversity techniques often adopted in UWA communications. However, can only be exploited with knowledge of the channel. Accordingly, channel estimation needs to performed without obtaining benefit diversity. Moreover, accurate...

[Purpose] This study was conducted in order to examine the effects of t'ai chi on females their 20s with acute low back pain. The subjects were 30 [Subjects and Methods] They equally randomly divided into a group stretching group. intervention applied three times per week, one hour each time, for total eight weeks. During hour, warm-up exercises 10 min, primary 40 cool-down min. In changes pain patients according method, muscle activity, pain, balance elements (left right side movement...

[Purpose] The purpose of this study was to investigate the impact that modified constraint-induced movement therapy has on upper extremity function and daily life chronic stroke patients. [Subjects Methods] Modified conduct for 2 patients with hemiplegia. It performed 5 days a week weeks, participants their living activities wearing mittens 6 hours day, including program. assessment conducted times in 3 weeks before after intervention. measured using box block test dynamometer, performance...

In this paper, a general channel modeling for beamforming MIMO system in LOS environments is introduced. order to validate the model, prototype hardware that supports 2×2 transmission developed and tested outdoor environment. This operates at millimeter-wave band, which occurrence of relatively high compared with low legacy frequency band due short wavelength. Numerical evaluation reveals performance highly dependant on number arrays spacing between adjacent arrays. Experimental results...

Compressed sensing based channel state information (CSI) feedback schemes have been investigated as a feasible solution for massive antenna systems. Most of research works focused on the measurement matrix design sparsity obtained from spatially correlated channels. In this letter, we analyze feasibility compressed CSI temporally The distortion and its rate loss in channels are analyzed function level number transmit antennas, which compared to those uncorrelated Based numerical analysis...

This paper discusses the preamble-based channel estimation for OQAM/FBMC and QAM/FBMC systems. Firstly, conventional methods system, namely pair of pilot (POP) interference approximation (IAM), are reviewed. Since system achieves orthogonality only in real domain, suffers from intrinsic under complex assumption, which makes problem still challenging system. To achieve we propose a new equipped with prototype filters. Based on configuration filters, preamble associated estimator also devised...

[Purpose] The purpose of this study was to investigate the effectiveness community-based Tai Chi (TC) training on balance control during stair descent by older adults. [Subjects] Participants were randomly assigned either TC group or wellness education (WE) group. participants in received three times a week for 12 weeks. WE participated health program one hour weekly. [Methods] Subjects stood predetermined position at top custom-built 3-step staircase and then negotiated stairs self-paced...

Harsh underwater channels and energy constraints are the two critical issues of acoustic (UWA) communications. To achieve a high channel estimation performance under severe channel, sparse Bayesian learning (SBL)-based was adopted for UWA orthogonal frequency division multiplexing (OFDM) systems. Accurate can guarantee successful reception transmitted data reduce retransmission occurrences, thereby, leading to energy-efficient However, SBL-based algorithms have improved performances in...

When a muscle is used repeatedly for long time, it often leads to muscular fatigue and soreness. In middle-aged elderly populations, pain during the performance of activities daily living common problem caused by physiological changes in musculoskeletal system due aging process. Microcurrent therapy has been shown be effective at reducing For such as standing or walking, specially developed shoes (G-man, Busan, South Korea) which are capable providing microcurrent these an advantage...

The leakage effect occurs in a DFT-based channel estimator (CE) due to the presence of guard bands, where energy impulse response (CIR) is dispersed other estimated taps. Furthermore, some CIR leaks outside estimation range and fails be captured estimation. This letter presents an enhanced CE for orthogonal frequency-division multiplexing (OFDM) systems. proposed method composed two techniques (spectral extrapolation circular shift) mitigate effect, followed by denoising post-processing...

추력편향 제어기술은 무인기의 고기동성 확보에 있어 필수적이다. 본 연구에서는 동축 코안다 효과를 이용한 초음속 사각노즐 유동의 특성을 정량적으로 측정할 수 있는 다분력 시험장치를 개발하였다. 엄밀한 보정 및 자세한 자료분석 과정을 통하여 연구에서 개발된 시험장치의 로드셀 상호간섭에 의한 측정오차는 약 5% 미만임이 관찰되었고, 또한 고압 연결튜브에 오차는 거의 무시할 있음이 판명되었다. 아울러 이용하여 연구의 사각노즐의 특성에 관한 기초적인 실험결과가 얻어졌다. The thrust vector control technique is essential for high maneuverability of unmanned aerial vehicles. In the present study, a multi-component balance was developed to quantitatively evaluate thrust-vectoring performance supersonic...

Purpose: This study was to investigate the differences abdominal muscles activities of according hip adductor contraction levels 20% (mild), 50% (moderate), and 70% (strong) MVIC on during bilateral lower extremity raising exercise supine.Methods: The subjects were a total 39 persons including 23 healthy males 16 females, who performed in 20%, 50%, contraction.Muscle measured by using S-EMG RA (rectus abdominis), IO (internal oblique), EO (external oblique).Results: Muscle activity internal...

키토산은 D-glucosamine과 N-acetyl-D-glucosamine이 <TEX>${\beta}$</TEX>-(1-4)로 연결된 직선상의 다당류이다. 분자량이 3,000 amu 이상인 키토산에 대한 in vivo 항균활성 및 저항성 유도 활성에 보고는 많지만, 이하인 올리고키토산에 항균활성에 논문은 거의 전무한 상태이다. 본 연구에서 올리고키토산은 P. infestans에 의해 발생하는 토마토 역병에 대하여 500 <TEX>${\mu}g$</TEX>/ml과 1,000 <TEX>${\mu}g$</TEX>/ml 수준에서 94% 이상의 매우 높은 접종 1일전 예방효과를 보였으며, 고추 탄저병과 밀 붉은녹병에 대해서는 67% 내지 89%의 중간 정도의 에방효과를 항온항습실 조건에서 보였다. 다른 한편으로 탄저병에 16시간 후 치료효과를 보였지만, 전혀 보이지 않았다. 포장에서 올리고키토산 액제는 감자 역병과 각각 72%와 48%의 방제효과를 결과는 올리고키토산이 역병 방제를...

This paper presents a wide-frequency-range, self-calibrating, built-off-test (BOT) transceiver for DDR4 SDRAM interface. The proposed BOT consists of data transceiver, phase-locked loop, delay-locked self-timing calibration (STC) circuit with 90-degree phase shifter, and self-voltage (SVC) circuit. In particular, both the STC SVC circuits, channel skew is effectively compensated, voltage margin can be maximized while communicating test equipment. realized in 20-nm DRAM CMOS technology. Using...

Given the ever-increasing interest in Internet of Underwater Things (IoUT), various studies are ongoing to solve some practical problems affecting development underwater wireless communication. The main related use acoustic waves a water medium, which extremely high propagation loss and drastic channel fluctuation common. On basis hands-on experience measurements made real environments, conventional Adaptive Modulation Coding (AMC), uses correlation between SNR (Signal Noise Ratio) BER (Bit...