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https://www.readbyqxmd.com/read/29331226/a-low-complexity-minimum-variance-beamformer-for-ultrasound-imaging-using-dominant-mode-rejection
#1
Babak Mohammadzadeh Asl, Ali Mohades Deylami
In recent years, high resolution adaptive minimum variance-based beamformers have been successfully applied to medical ultrasound imaging to improve its resolution and contrast, simultaneously. However, these improvements come at the cost of much more computational complexity in comparison to the non-adaptive delay-and-sum beamformer. The computational overhead mainly results from the L×L covariance matrix inversion needed for computation of the adaptive weights, the complexity of which is cubic with the subarray size, O(L3)...
January 4, 2018: Ultrasonics
https://www.readbyqxmd.com/read/29330670/treatment-of-partial-thickness-rotator-cuff-tears-in-overhead-athletes
#2
REVIEW
Joseph N Liu, Grant H Garcia, Anirudh K Gowd, Brandon C Cabarcas, Michael D Charles, Anthony A Romeo, Nikhil N Verma
PURPOSE OF REVIEW: To review the etiology, classification, presentation, evaluation, treatment strategy, and outcomes in overhead athletes with partial thickness rotator cuff tears. RECENT FINDINGS: Despite advances in surgical repair techniques, return to play following surgical repair of partial rotator cuff tears remains modest at best. Overhead athletes may be particularly prone to rotator cuff pathology due to the supraphysiological strains within the tendon during the throwing motion, as well as mechanical stress with contact between the undersurface of the rotator cuff and the glenoid...
January 13, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29330669/hip-and-groin-injuries-in-baseball-players
#3
REVIEW
Ryan A Mlynarek, Struan H Coleman
PURPOSE OF REVIEW: To discuss the clinical significance of the most common hip and groin injuries in baseball players, as well as an algorithmic approach to diagnosis and treatment of these injuries. RECENT FINDINGS: (a) Limitations in throwing velocity, pitch control, and bat swing speed may be secondary to decreased mobility and strength within the proximal kinetic chain, which must harness power from the lower extremities and core. (b) Approximately 5.5% of all baseball injuries per year involve the hip/groin and may lead to a significant amount of time spent on the disabled list...
January 12, 2018: Current Reviews in Musculoskeletal Medicine
https://www.readbyqxmd.com/read/29328313/achievable-information-rate-enhancement-of-visible-light-communication-using-probabilistically-shaped-ofdm-modulation
#4
Chenhui Xie, Zexin Chen, Songnian Fu, Wu Liu, Zhixue He, Lei Deng, Ming Tang, Deming Liu
We present the first experimental demonstration of orthogonal frequency division multiplexed (OFDM) modulation using the probabilistic shaping (PS) technique in visible light communication (VLC) systems, in order to increase the achievable information rate (AIR) according to the pre-estimated signal to noise ratio (SNR) of VLC channel. We numerically investigate the performance of PS technique and make a fair comparison with bit-loading technique under different scenarios. By using a phosphor-LED based VLC system with available bandwidth of ~45-MHz, OFDM with PS technique can experimentally realize an AIR of 204...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328307/channel-estimation-for-wideband-underwater-visible-light-communication-a-compressive-sensing-perspective
#5
Xu Ma, Fang Yang, Sicong Liu, Jian Song
With the rapid development of light emitting diode (LED), visible light communication (VLC) becomes an important technique for information transmission including underwater applications. However, accurate channel estimation for underwater VLC is still challenging due to the complex environment of the underwater VLC channel. In this paper, by utilizing a proper approximation, where the channel attenuation is linear with the frequency, a new compressive sensing (CS) based channel estimation approach is proposed...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29324861/cost-of-treatment-for-head-and-neck-cancer-in-india
#6
Akashdeep Singh Chauhan, Shankar Prinja, Sushmita Ghoshal, Roshan Verma, Arun S Oinam
There are no published data on the cost of cancer treatment for guiding reimbursement decisions in India. The present study was designed to estimate the cost of treating head and neck cancer (HNC) with the aim of determining package rates. The present study was undertaken in the Departments of Radiotherapy and Otolaryngology of a large tertiary care hospital in North India. Economic health system costs incurred were assessed using a bottom-up methodology. Data on all resources-capital or recurrent, incurred on the delivery of HNC treatment were collected from April 2014 to March 2015...
2018: PloS One
https://www.readbyqxmd.com/read/29324719/an-enhanced-secure-identity-based-certificateless-public-key-authentication-scheme-for-vehicular-sensor-networks
#7
Congcong Li, Xi Zhang, Haiping Wang, Dongfeng Li
Vehicular sensor networks have been widely applied in intelligent traffic systems in recent years. Because of the specificity of vehicular sensor networks, they require an enhanced, secure and efficient authentication scheme. Existing authentication protocols are vulnerable to some problems, such as a high computational overhead with certificate distribution and revocation, strong reliance on tamper-proof devices, limited scalability when building many secure channels, and an inability to detect hardware tampering attacks...
January 11, 2018: Sensors
https://www.readbyqxmd.com/read/29324209/using-process-improvement-tools-to-improve-the-care-of-patients-with-neutropenic-fever-in-the-emergency-room
#8
Avantika Dang, Lauren N Gjolaj, Myka Whitman, Gustavo Fernandez
PURPOSE: The purpose of this study was to improve the care of patients with neutropenic fever in an academic acute care hospital's emergency room (ER). METHODS: Using the define, measure, analyze, improve, control method, a two-phase project with three critical to quality metrics (reduction in time to antibiotic administration, increase in percentage of patients with neutropenic fever identified as an oncology emergency, and increase in patients cohorted on oncology units) was completed...
January 2018: Journal of Oncology Practice
https://www.readbyqxmd.com/read/29322208/the-association-of-the-medial-joint-vacuum-phenomenon-with-ulnar-collateral-ligament-injury-in-symptomatic-elbows-of-younger-athletes
#9
Ryan Tai, Tyson Bolinske, Varand Ghazikhanian, Jacob C Mandell
OBJECTIVE: To determine the prevalence of intra-articular gas (IAG) on elbow radiography and evaluate variables, including IAG, as predictors of UCL injury. MATERIALS AND METHODS: This IRB-approved retrospective study consisted of 241 consecutive elbow radiographic studies containing AP radiographs with valgus stress of both symptomatic and asymptomatic sides in 234 patients. The IAG, medial joint space (MJS), and MJS difference between the symptomatic and asymptomatic elbow (MJSD) were evaluated by two readers, as well as patient age, gender, sport played, and handedness...
January 10, 2018: Skeletal Radiology
https://www.readbyqxmd.com/read/29320946/cognitive-demands-influence-lower-extremity-mechanics-during-a-drop-vertical-jump-task-in-female-athletes
#10
Thomas Gus Almonroeder, Thomas Kernozek, Stephen Cobb, Brooke Slavens, Jinsung Wang, Wendy Huddleston
Study Design Cross-sectional study. Background The drop vertical jump task is commonly used in anterior cruciate ligament injury risk screening; however, the predictive validity is limited. Part of the limited predictive validity may be because the drop vertical jump task does not impose cognitive demands that reflect sports participation. Objectives To investigate the influence of additional cognitive demands on lower extremity mechanics during execution of the drop vertical jump task. Methods Twenty uninjured females (ages 18-25 years old) were required to perform the standard drop vertical jump task, as well as drop vertical jumps which included additional cognitive demands...
January 10, 2018: Journal of Orthopaedic and Sports Physical Therapy
https://www.readbyqxmd.com/read/29320441/restop-retaining-external-peripheral-state-in-intermittently-powered-sensor-systems
#11
Alberto Rodriguez Arreola, Domenico Balsamo, Geoff V Merrett, Alex S Weddell
Energy harvesting sensor systems typically incorporate energy buffers (e.g., rechargeable batteries and supercapacitors) to accommodate fluctuations in supply. However, the presence of these elements limits the miniaturization of devices. In recent years, researchers have proposed a new paradigm, transient computing, where systems operate directly from the energy harvesting source and allow computation to span across power cycles, without adding energy buffers. Various transient computing approaches have addressed the challenge of power intermittency by retaining the processor's state using non-volatile memory...
January 10, 2018: Sensors
https://www.readbyqxmd.com/read/29316702/an-autonomous-connectivity-restoration-algorithm-based-on-finite-state-machine-for-wireless-sensor-actor-networks
#12
Ying Zhang, Jun Wang, Guan Hao
With the development of autonomous unmanned intelligent systems, such as the unmanned boats, unmanned planes and autonomous underwater vehicles, studies on Wireless Sensor-Actor Networks (WSANs) have attracted more attention. Network connectivity algorithms play an important role in data exchange, collaborative detection and information fusion. Due to the harsh application environment, abnormal nodes often appear, and the network connectivity will be prone to be lost. Network self-healing mechanisms have become critical for these systems...
January 8, 2018: Sensors
https://www.readbyqxmd.com/read/29316664/retransmission-avoidance-for-reliable-data-delivery-in-underwater-wsns
#13
Babar Ali, Arshad Sher, Nadeem Javaid, Saif Ul Islam, Khursheed Aurangzeb, Syed Irtaza Haider
The energy-efficient and reliable delivery of data packets in resource constraint underwater wireless sensor networks (UWSNs) is one of the key considerations to enhance the network lifetime. The traditional re-transmissions approach consumes the node battery and increases the communication overhead, which results in congestion and affects the reliable data packet delivery in the network. To ensure the reliability and conserve the node battery, in this paper, we propose adaptive forwarding layer multipath power control routing protocol to reduce the energy dissipation, achieve the data reliability and avoid the energy hole problem...
January 7, 2018: Sensors
https://www.readbyqxmd.com/read/29315453/a-partial-posterior-bundle-ulnar-collateral-ligament-tear-in-a-10-year-old-boy
#14
Todd P Pierce, Jennifer Kurowicki, Kimona Issa, Anthony Festa, Vincent K McInerney, Anthony J Scillia
Medial-sided elbow pain is becoming more common among pediatric overhead sport athletes. One potential cause of this is a partial or complete tear of the ulnar collateral ligament (UCL). Because the growth plate remains open in many of these athletes, the most common injury experienced is an avulsion at the medial epicondyle. However, although rare, there is a potential to tear the UCL, with the most common tears occurring at the anterior bundle. However, tears to the posterior bundle are quite rare in pediatric patients...
December 22, 2017: Surgical Technology International
https://www.readbyqxmd.com/read/29304985/editorial-commentary-the-partial-thickness-rotator-cuff-tear-is-acromioplasty-without-repair-ever-indicated
#15
EDITORIAL
Frank A Cordasco
I believe that arthroscopic repair is the treatment of choice for patients with partial thickness rotator cuff tears when nonoperative methods have been exhausted. Excluding overhead athletes and patients in whom long head biceps tendon pathology is the primary concern, I do not believe that a significant role exists for debridement with or without acromioplasty in the majority of patients with partial thickness tears. Regarding the repair technique, I prefer in situ repair for bursal-sided tears because the superior capsule is intact and completion of the tear with repair for articular-sided tears...
January 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29304957/editorial-commentary-it-s-the-fracture-not-the-fragment-that-causes-the-pain-posteromedial-elbow-impingement-in-baseball-players
#16
EDITORIAL
Shawn W O'Driscoll
Posterior impingement pain in baseball players is typically due to a fractured olecranon osteophyte. Computed tomographic (CT) scanning is the imaging of choice when evaluating posterior or posteromedial elbow pain in athletes who have subjected the elbow to excessive stresses such as occur in overhead throwing and weightlifting. Sometimes the fracture fragment can be so small that it might not be detected on plain radiographs, magnetic resonance imaging, or even at the time of arthroscopy. Symptomatic fractured olecranon osteophytes can be diagnosed clinically with the extension impingement test or arm bar test...
January 2018: Arthroscopy: the Journal of Arthroscopic & related Surgery
https://www.readbyqxmd.com/read/29304794/socio-demographic-and-household-attributes-may-not-necessarily-influence-malaria-evidence-from-a-cross-sectional-study-of-households-in-an-urban-slum-setting-of-chennai-india
#17
Shalu Thomas, Sangamithra Ravishankaran, Aswin Asokan, N A Johnson Amala Justin, T Maria Jusler Kalsingh, Manu Thomas Mathai, Neena Valecha, Alex Eapen
BACKGROUND: Household and environmental factors are reported to influence the malaria endemicity of a place. Hence, a careful assessment of these factors would, potentially help in locating the possible areas under risk to plan and adopt the most suitable and appropriate malaria control strategies. METHODS: A cross-sectional household survey was carried out in the study site, Besant Nagar, Chennai, through random sampling method from February 2014 to February 2015...
January 5, 2018: Malaria Journal
https://www.readbyqxmd.com/read/29301354/atmospheric-sensors-and-energy-harvesters-on-overhead-power-lines
#18
Richard M White, Duy-Son Nguyen, Zhiwei Wu, Paul K Wright
We demonstrate the feasibility of using novel, small energy harvesters to power atmospheric sensors and radios simply attached to a single conductor of existing overhead power distribution lines. We demonstrate the ability to harvest the required power for operating multiple atmospheric and power-system sensors, together with short-range radios that could broadcast atmospheric sensor data to the cellphones of people nearby. Occasional long-range broadcasts of the data could also be made of both atmospheric and power-line conditions...
January 3, 2018: Sensors
https://www.readbyqxmd.com/read/29301199/energy-efficient-region-shift-scheme-to-support-mobile-sink-group-in-wireless-sensor-networks
#19
Yongbin Yim, Kyong Hoon Kim, Monther Aldwairi, Ki-Il Kim
Mobile sink groups play crucial roles to perform their own missions in many wireless sensor network (WSN) applications. In order to support mobility of such sink groups, it is important to design a mechanism for effective discovery of the group in motion. However, earlier studies obtain group region information by periodic query. For that reason, the mechanism leads to significant signaling overhead due to frequent flooding for the query regardless of the group movement. Furthermore, the mechanism worsens the problem by the flooding in the whole expected area...
December 30, 2017: Sensors
https://www.readbyqxmd.com/read/29300329/reliability-aware-cooperative-node-sleeping-and-clustering-in-duty-cycled-sensors-networks
#20
Jeungeun Song, Yiming Miao, Enmin Song, M Shamim Hossain, Mohammed F Alhamid
Duty-cycled sensor networks provide a new perspective for improvement of energy efficiency and reliability assurance of multi-hop cooperative sensor networks. In this paper, we consider the energy-efficient cooperative node sleeping and clustering problems in cooperative sensor networks where clusters of relay nodes jointly transmit sensory data to the next hop. Our key idea for guaranteeing reliability is to exploit the on-demand number of cooperative nodes, facilitating the prediction of personalized end-to-end (ETE) reliability...
January 4, 2018: Sensors
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