Fast Turn Research Articles

Programmable multi-stimulus-responsive whirligig beetle inspired soft robot with multifunctionality based on composite materials

In nature, surfaces are evolutionarily designed to allow species to adapt to their environments. Nowadays, more and more researchers have paid attention to soft robots based on superhydrophobic surfaces. Inspired by the swimming characteristics of whirligig beetles on the surface of water, we propose in this study a multi-stimulus-responsive soft robot that can be driven by light, magnetism and chemistry to achieve fast straight-line motions, turns and rotations on the surface of water. The soft robot is made of a composite material based on graphene oxide (GO) and polydimethylsiloxane (PDMS), which has high hydrophobicity and excellent photothermal properties. With a multi-stimulus-responsive driving mechanism, the soft robot can be used in applications such as oil recovery, cargo transportation, obstacle avoidance, and material dispersion. It is envisioned that this study can guide the development of multi-stimulus-responsive soft robots and offer some useful reference for their applications in water quality monitoring and oil recovery.

PAL-SLAM2: Visual and visual–inertial monocular SLAM for panoramic annular lens

This paper presents PAL-SLAM2, a visual and visual–inertial monocular simultaneous localization and mapping (SLAM) system for a panoramic annular lens (PAL) with an ultra-hemispherical field of view (FoV), overcoming the limitations of traditional frameworks in handling fast turns, nighttime conditions and rapid lighting changes. The system incorporates modules for initialization, tracking, local mapping, loop and map merging. To fully exploit information from the negative space (z<0), keypoints are projected onto the unit sphere for visual initialization and tightly-coupled visual–inertial optimization. Leveraging a multimap strategy, the feature-based PAL-SLAM2 is capable of detecting unidirectional and bidirectional public areas using PAL images, thereby enhancing the performance of loop correction and map merging. Testing indicates that it achieves an average accuracy of 7.1 cm on the PALVIO indoor dataset, surpassing similar state-of-the-art frameworks. Furthermore, we have collected a large-scale dataset comprising over 120,000 images with corresponding inertial measurement unit (IMU) data, demonstrating PAL-SLAM2’s robustness under challenging outdoor conditions. Relying solely on visual and inertial inputs, our system is particularly suited for environments where Global Navigation Satellite System (GNSS) signals are frequently obstructed, such as indoor spaces or dense urban areas. The dataset can be accessed at: https://github.com/wwendy233/Plaza-Dataset.

Contribution of Hepatitis D Virus in Liver Cancer Among Hepatitis B Virus Infected Populations of Central Africa: A Systematic Review and Meta-Analysis

Background and aims: Hepatocellular carcinoma (HCC) is a rampant disease in sub-Saharan Africa. Viral hepatitis is currently the most common factor in the occurrence of HCC in sub-Saharan Africa. Hepatitis B virus (HBV) causes liver disease which may or may not progress to HCC. In a dual infection with Hepatitis D virus (HDV), HCC tends to have a faster turn out. Our aim is to evaluate the influence of HDV on the risk of HCC and elaborate on factors favouring HDV infection. Methods: A review of available literature in English or French was conducted in major data bases with the search terms “liver disease”, “hepatocellular carcinoma”, “hepatitis delta and liver disease”, “hepatitis D virus infection”, “prevalence of HDV”, and “hepatitis D in Central Africa”, and each term was associated to a central African country. A meta-analysis of included publications was then performed. Results: The prevalence of HDV was 28% (95% CI). There was a higher risk of HCC in HBV-HDV dual infection (OR: 0.82 [95% CI: -0.01 to 1.65]) compared to that in HBV mono-infection. HDV genotype 1 was found to be the most prominent in central Africa, with HDV subgenotypes 1a and 1b dominating. Hepatitis delta was more prevalent in rural areas than in urban areas. Conclusion: Hepatitis D is highly prevalent in the HBV population of central Africa. The presence of HDV increases the risk of HCC. More research has to be carried out to understand how HDV speeds up liver disease and hence how to prevent it.

Hand Gestures Have Predictive Potential During Conversation: An Investigation of the Timing of Gestures in Relation to Speech.

During face-to-face conversation, transitions between speaker turns are incredibly fast. These fast turn exchanges seem to involve next speakers predicting upcoming semantic information, such that next turn planning can begin before a current turn is complete. Given that face-to-face conversation also involves the use of communicative bodily signals, an important question is how bodily signals such as co-speech hand gestures play into these processes of prediction and fast responding. In this corpus study, we found that hand gestures that depict or refer to semantic information started before the corresponding information in speech, which held both for the onset of the gesture as a whole, as well as the onset of the stroke (the most meaningful part of the gesture). This early timing potentially allows listeners to use the gestural information to predict the corresponding semantic information to be conveyed in speech. Moreover, we provided further evidence that questions with gestures got faster responses than questions without gestures. However, we found no evidence for the idea that how much a gesture precedes its lexical affiliate (i.e., its predictive potential) relates to how fast responses were given. The findings presented here highlight the importance of the temporal relation between speech and gesture and help to illuminate the potential mechanisms underpinning multimodal language processing during face-to-face conversation.

Retailing in India: Promulgation and Confrontation

The blast in India's retail area has fascinated numerous players-both at the public and global level-to receive the rewards of development in the retail business. The upsurge in the retail business has seriously changed the whole idea of shopping as far as the most recent organizations that are embraced and furthermore by virtue of customer purchasing conduct. There were days when buyers had a more independent attitude. Global brands where unfathomable and there was no openness of the assortments presented by the worldwide players. Shopping was more viewed as an action or an awkward undertaking where it was simply done to satisfy ones needs. Be that as it may, presently the circumstance appears to have taken a fast turn where in the wake of opening of the economy and passage of MNCs, shopping is appeared to be more as a joy and involvement in a wide assortment of items to browse the accessible. The blast of present-day retail design is clear from the rambling retail outlets, multistory shopping centers with amusement and food all under a solitary rooftop, stores, and hypermarkets, every one of them making shopping a pleasurable encounter. The monetary push of the 90's as confirmed in vigorous GDP development, more grounded money stores and dynamic market and working climate are impelling India on a direction of outstanding development in the area of retail exchange. The post advancement has seen retail arise as a dawn area. The financial advancement and expanded buyers mindfulness have given a driving force to retail change

Biological sex-related differences in whole-body coordination during standing turns in healthy young adults

Biological sexes (male and female) have been reported to influence postural control and balance due to differences in musculoskeletal structures, hormonal factors, and neuromuscular control. These factors can contribute to the turning performance, potentially leading to an increased incidence of falls, particularly during turning. Therefore, this study aimed to explore the whole-body coordination and stepping characteristics and during standing turns in healthy adults to determine the effects of biological sex and turn speed. Fifty participants (25 males and 25 females) completed 180° standing turns on level ground. Inertial Measurement Units (XSENS) were used to measure whole-body movement turning kinematics and stepping characteristics. Moreover, clinical outcome of dynamic balance was measured by the Timed Up and Go (TUG). Participants were randomly tasked to turn at three speeds; fast, moderate, or slow to the left and right sides. Mann–Whitney U tests were used to compare the independent variables between male and females, and Friedman tests with Dunn’s tests for pairwise comparisons were used to compare between the three turning speeds within the two groups. The results demonstrated that significant differences were seen between males and females during fast turning for the leading foot onset (p = 0.048) and in the slow speed for the total step (p = 0.033), showing that these were greater in female with an increase in turn speed. In addition, significant differences were seen only in the males when comparing different speeds in the trailing foot onset latency (p = 0.035), step size (p = 0.009), and total number of steps (p = 0.002), while in the females a significant difference was found in peak head yaw velocity between fast and slow turn speeds, and moderate and slow turn speeds. Finally, there was no significant difference in TUG between groups. Therefore, these findings show differences between biological sexes in the response to whole-body coordination and step characteristics, indicating that females tend to have more changes in stepping characteristics compared to males due to differences in turning speed. This can affect their balance and stability. However, the differences in biological sex did not impact the dynamic balance and fall risk due to the lack of a significant difference shown by TUG between males and females.

Facilitating question identification through natural intensity eyebrow movements in virtual avatars

In conversation, recognizing social actions (similar to ‘speech acts’) early is important to quickly understand the speaker’s intended message and to provide a fast response. Fast turns are typical for fundamental social actions like questions, since a long gap can indicate a dispreferred response. In multimodal face-to-face interaction, visual signals may contribute to this fast dynamic. The face is an important source of visual signalling, and previous research found that prevalent facial signals such as eyebrow movements facilitate the rapid recognition of questions. We aimed to investigate whether early eyebrow movements with natural movement intensities facilitate question identification, and whether specific intensities are more helpful in detecting questions. Participants were instructed to view videos of avatars where the presence of eyebrow movements (eyebrow frown or raise vs. no eyebrow movement) was manipulated, and to indicate whether the utterance in the video was a question or statement. Results showed higher accuracies for questions with eyebrow frowns, and faster response times for questions with eyebrow frowns and eyebrow raises. No additional effect was observed for the specific movement intensity. This suggests that eyebrow movements that are representative of naturalistic multimodal behaviour facilitate question recognition.

Conversational Eyebrow Frowns Facilitate Question Identification: An Online Study Using Virtual Avatars.

Conversation is a time-pressured environment. Recognizing a social action (the ''speech act,'' such as a question requesting information) early is crucial in conversation to quickly understand the intended message and plan a timely response. Fast turns between interlocutors are especially relevant for responses to questions since a long gap may be meaningful by itself. Human language is multimodal, involving speech as well as visual signals from the body, including the face. But little is known about how conversational facial signals contribute to the communication of social actions. Some of the most prominent facial signals in conversation are eyebrow movements. Previous studies found links between eyebrow movements and questions, suggesting that these facial signals could contribute to the rapid recognition of questions. Therefore, we aimed to investigate whether early eyebrow movements (eyebrow frown or raise vs. no eyebrow movement) facilitate question identification. Participants were instructed to view videos of avatars where the presence of eyebrow movements accompanying questions was manipulated. Their task was to indicate whether the utterance was a question or a statement as accurately and quickly as possible. Data were collected using the online testing platform Gorilla. Results showed higher accuracies and faster response times for questions with eyebrow frowns, suggesting a facilitative role of eyebrow frowns for question identification. This means that facial signals can critically contribute to the communication of social actions in conversation by signaling social action-specific visual information and providing visual cues to speakers' intentions.

Analysis on KFCs Business Model in China

In China, in addition to KFC and McDonald's, there are numerous new Chinese fast food restaurants, such as Mr. Rice, Xiangcun Ji, Real Kung Fu, etc. In China, however, KFC has done a much better job of "adapting to the local cuisine and implementing numerous adjustments" than McDonald's. Therefore, Chinese fast food hasmuch to learn from them. This study will employ three methods of research: comparative analysis, survey method, and case study. The study explains why KFC performs significantly better than McDonald's in China, both in terms of revenue and number of locations. The paper analyzed several business strategies that can be taught from KFC's business model in order to make China's new fast food as global as KFC. The paper demonstrates to the viewers how to use KFC's superior marketing techniques to Chinese fast food and turn it into a global chain. The paper will provide some suggestions forthese fast food restaurants in becoming more international and expanding their number of stores, as well as teaching them how to apply marketing strategies to increase their revenue.

Design and comparative study of steering controller for tracked vehicle based on disturbance observation

Tracked vehicles are suitable for rough, low-bearing ground or complex environments because of the large contact area and low pressure between tracks and the ground, and the great obstacle crossing and avoidance capabilities of tracked vehicles. For fast and safe turns, an advanced steering controller is required to achieve precise tracking and stability under system uncertainty. In this study, a steering controller is proposed for tracked vehicles by combining a parameter adaptive law and a second order disturbance observer (DO-2). The friction coefficient between track and ground is estimated online as an uncertain parameter. Random disturbance and function uncertainty are resisted by DO-2. Using Lyapunov’s theory, the input-state stabilities of DO-2 and the closed loop system are proved under random disturbance. A sufficient condition is proposed to check the stability of the system under function uncertainty. Field tests are carried out on rough and slippery grounds using a small-scale electric tracked vehicle. Compared with the controllers based on first order disturbance observer (DO-1) or linear extended state observer (LESO), the optimized DO-2-based steering controller has a smaller root-mean-square error of yaw rate tracking. Adaptive law improves tracking accuracy by 22% on slippery ground.

Assessment of Foot Deviations and Associated Foot Injuries and its Effect on Foot Functional Activity among Amateur Adolescent Female Kathak Dancers in Selected Dance Schools in Bengaluru

Background &amp; purpose: Kathak is a north Indian classical dance form that requires fast rhythmically sophisticatedfootwork and fast turns, which puts the dancers at risk of foot injuries. Any foot deviations or reduced foot functionare associated with an increased risk of a foot injury. This study aims to assess foot deviations and related footinjuries and their effect on functional activity and create awareness among kathak dancers about foot position andits risk factor for injury. Methods: This study included 100 recruited subjects based on the inclusion and exclusioncriteria. Demographic data and other variables were collected and recorded, and measures like foot posture andfunction indexes were used.Results: The foot posture index mean and SD of the left feet for the subjects recruited in the present study were1.83 and 1.43 and of the right feet were 1.89 and 1.54 respectively. The overall foot functional index score mean andSD, for the subjects recruited in the present study were 9.76 and 10.39.Conclusion: The present study concluded by stating that the foot posture index was normal and didn’t haverestrictions on foot usage while performing the kathak dance form. Whereas with the foot function index, it wasobserved that the pain experienced by subjects was severe which restricted their activity pattern and hinderedtheir dance performance.

Reduced Vestibulo-Ocular Reflex During Fast Head Rotation in Complete Darkness.

The human vestibulo-ocular reflex (VOR) leads to maintenance of the acuity of an image on the retina and contributes to the perception of orientation during high acceleration head movements. Our objective was to determine whether vision affects the horizontal VOR by assessing and comparing the performance at the boundaries of contribution of: (a) unrestricted visual information and (b) no visual information. Understanding how the VOR performs under both lighted and unlighted conditions is of paramount importance to avoiding falls, perhaps particularly among the elderly. We tested 23 participants (M age = 35.3years, standard error of mean (SEM) = 2.0years). The participants were tested with the video Head Impulse Test (vHIT), EyeSeeCam from Interacoustics™, which assesses whether VOR is of the expected angular velocity compared to head movement angular velocity. The vHIT tests were performed under two conditions: (a) in a well-lit room and (b) in complete darkness. The VOR was analyzed by evaluating the gain (quotient between eye and head angular velocity) at 40, 60 and 80ms time stamps after the start of head movement. Additionally, we calculated the approximate linear gain between 0-100ms through regression. The gain decreased significantly faster across time stamps in complete darkness (p < .001), by 10% in darkness compared with a 2% decrease in light. In complete darkness, the VOR gain gradually declined, reaching a marked reduction at 80ms by 10% (p < .001), at which the head velocities were 150°/second or faster. The approximate linear gain value was not significantly different in complete darkness and in light. These findings suggest that information from the visual system can modulate the high velocity VOR. Subsequently, fast head turns might cause postural imbalance and momentary disorientation in poor light in people with reduced sensory discrimination or motor control, like the elderly.

Analysis of APTT Based Clot Waveform Parameters in Various Clinical Conditions – A Study at A Tertiary Care Center

Various coagulation tests like Prothrombin Time (PT) and Activated Partial Thromboplastin Time (APTT) are estimated by automated coagulation analyzers. The newer fully automated analyzers generate clot wave forms aPTT-CWA for these parameters are derived. In this study, the objective was to analyze clot wave form characteristics morphology and its first and second derivative values in cases with abnormal APTT. ACL TOP 300 generated curves for APTT in a total 125 patients with 20 normal controls are included. First derivative, second derivative, morphology of curve: sigmoid, biphasic, prolonged pre-coagulation phase, second derivative morphology like early and late shoulder, biphasic peak, delayed deceleration were the analyzed parameters. Wave clot forms of 125 patients were included in this study. Patients (M:F - 2.2:1, mean age: 46.9 ± 20 years). A spectrum of clinical conditions was Covid (20%), liver disease (23%), polytrauma (10.4%), cardiac diseases (8.8%), sepsis/DIC (7.2%), thromboembolism (7.2%), renal diseases (6.4%), bacterial infections (4%), dengue (4%), snake bite (1.6%) and factor deficiency (1.6%). Liver and heart disease showed a significant difference in acceleration and deceleration peaks followed by sepsis, dengue, polytrauma and sepsis/DIC. Deceleration peak was prolonged in patients of Covid (p&lt;0.05). Sepsis and liver diseases showed prolonged first derivative peak (p&lt;0.05). CWA is very easily available on all automated coagulation analyzers. It is inexpensive with fast turn round time. Both quantitative as well as qualitative informations such as velocity, acceleration of clot formation and wave pattern details were recorded. Our study highlights importance of quantitative and qualitative CWA parameters acquired by performing APTT test for the automated analyzers.

A Novel Ultrafast Turn-Off Failure Detection Method of Integrated Gate Commutated Thyristor for VSC Application

Integrated gate commutated thyristor (IGCT) has prospects in voltage source converter application. However, it has no desaturation characteristic in conducting state like insulated gate bipolar transistor, for which fast turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> failure detection for blocking converter in deadtime is of great significance. In this letter, an ultrafast IGCT turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> failure detection method is proposed. First, turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> process and failure mechanism of IGCT is analyzed. It is clarified that turn-off capacitors of gate driver will continue to discharge in turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> failure, thus generating a voltage drop on turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off mosfet</small> , which can be the criterion of failure. Then prototype, threshold and timing sequence are designed. Analog circuit including amplifier, hysteretic comparator and reference circuit is used for fast and accurate measurement of voltage on <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">mosfet</small> . The failure gate current and fall time of turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> trail current is measured in pulse test. Finally, experiments are carried out to verify the feasibility of the proposed scheme. The results show that the proposed scheme can achieve reliable turn- <sc xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">off</small> failure detection within 19 microseconds. Neither false detection nor missed detection occurred. Proposed method has great accuracy and rapidity, and is convenient in implementation. It will greatly decrease the extreme failure rate of IGCT-based converters.

Theoretical Aspects of Remote Learning in Grades I–III of the Primary School

Early childhood education is an essential stage in the life of every child. Thanks to participation in lessons and school life, the child not only gains knowledge and various skills, but also shapes his personality, establishes bonds, and learns how to function in a social group. At the beginning of March 2020, the current order, also in the field of education, was disrupted by the outbreak of the Covid-19 pandemic. By decision of the state authorities, schools and many other public facilities were closed. Education has changed its current form by moving completely on the virtual plane, which has never happened before. The extremely fast turn of events caused huge chaos in both the pedagogical environment and among parents and their children. This has become a contribution to the theoretical and research considerations of many people.

ELASTOGRAPHY IN TA TIGHTNESS TO EVALUATE MUSCLE PHYSIOLOGY – A DIAGNOSTIC APPROACH

Shear wave elastography is useful for treating the musculoskeletal system. This drug is used to treat tendonitis, ligamentitis, and muscle pain. In the human body, the Achilles tendon is the strongest. The quantity and incidence of Achilles tendon overuse injuries and total ruptures in developed countries has increased in recent decades, owing to the fact that most Achilles tendon injuries occur in sports and there has been a general increase in sporting activity. Tendinopathy is the most common clinical diagnosis for Achilles tendon overuseinjuries, and it is marked by pain and swelling in the Achilles tendon, as well as an inability to engage in strenuous activities. Nonoperative treatment is helpful for the majority of people with Achilles tendon injuries, and those who do not respond to nonoperative treatment require surgery. In sports that demand jumping, running, and fast turns, a complete rupture of the Achilles tendon is common. Blue, green, and yellow/red are the color associated with rigid, intermediate, and soft tissue, respectively.Colour mapping will help us in rehabilitation .

1.2‐kV silicon carbide planar split‐gate MOSFET with source field plate for superior figure‐of‐merits

Planar split-gate MOSFETs (SG-MOSFETs) are promising in high-frequency power applications due to the fast turn on/off speeds and low switching loss. However, SG-MOSFETs suffer from crowded electric field at the edge of the split poly-Si gate, resulting in the degradation of the blocking voltage and the gate oxide reliability. This issue becomes more critical in 4H-SiC MOSFETs due to the high critical breakdown electric field. In this work, a new 1.2-kV 4H-SiC SG-MOSFET structure is proposed and investigated by TCAD simulation. The proposed structure features a source metal field plate located between two adjacent split poly-Si gates (termed SFP-SG-MOSFET). In the blocking state, the source metal field plate reduces the peak electric field at the edge of the poly-Si gate. The maximum electric field in the gate oxide of the proposed SFP-SG-MOSFET is reduced by 52.8% compared with the SG-MOSFET, for reliable operation. The reverse transfer capacitance (Crss) and gate-to-drain charge (Qgd) are reduced by 56.4% and 61.8% compared with SG-MOSFETs, respectively. Therefore, the high-frequency figure-of-merits (HF-FOM) [Ron × Crss] and [Ron × Qgd] are improved by 2.2 times and 2.5 times, respectively.

Readiness to implement on-site molecular testing for tuberculosis in community health centers in Uganda

BackgroundNewer molecular testing platforms are now available for deployment at lower-level community health centers. There are limited data on facility- and health worker-level factors that would promote successful adoption of such platforms for rapid tuberculosis (TB) testing and treatment initiation. Our study aimed to assess readiness to implement onsite molecular testing at community health centers in Uganda, a high TB burden country in sub-Saharan Africa.MethodsTo understand implementation readiness, we conducted a qualitative assessment guided by the Consolidated Framework for Implementation Research (CFIR) at 6 community health centers in central and eastern Uganda between February and April 2018. We conducted 23 in-depth, semi-structured interviews with health workers involved in TB care at each health center to assess TB-related work practices and readiness to adopt onsite molecular testing using the GeneXpert Edge platform. Interviews were transcribed verbatim and coded for thematic analysis.ResultsParticipants (N=23) included 6 nurses/nursing assistants, 6 clinicians, 6 laboratory directors/technicians, 1 medical officer, 2 health center directors, and 2 other health workers involved in TB care. Health workers described general enthusiasm that on-site molecular testing could lead to greater efficiencies in TB diagnosis and treatment, including faster turn- around time for TB test results, lack of need for trained laboratory technicians to interpret results, and reduced need to transport sputum specimens to higher level facilities. However, health workers also expressed concerns about implementation feasibility. These included uncertainty about TB infection risk, safety risks from disposal of hazardous waste, a lack of local capacity to provide timely troubleshooting and maintenance services, and concerns about the security of GeneXpert devices and accessories. Health workers also expressed the need for backup batteries to support testing or charging when wall power is unstable.ConclusionOur study generated a nuanced understanding of modifiable contextual barriers and led to direct revisions of implementation strategies for onsite molecular testing. The findings highlight that novel diagnostics should be implemented along with health system co-interventions that address contextual barriers to their effective uptake. Pre-implementation assessment of stakeholder perspectives, collaborative work processes, and institutional contexts is essential when introducing innovative technology in complex health care settings.

Aspek Klinis dan Pemeriksaan Laboratorium untuk Diagnosis Demam Berdarah Dengue

Dengue infection is a viral infection through arthropods that is found throughout the world. This disease is caused by dengue virus which consists of four serotypes and each of these serotypes can cause disease. The pathogenesis of dengue infection, especially the mechanism of dengue hemorrhagic fever (DHF) manifestations is still not clearly understood. The results of laboratory tests on dengue hemorrhagic fever found thrombocytopenia (≤ 100,000/mm3), a 20% increase in hematocrit and a positive Rumple Leed test. Five basic serological tests used to detect antibodies in diagnosing dengue infection are haemagglutination-inhibition (HI), complement fixation (CF), neutralization test (NT), IgM capture enzyme-linked immunosorbent assay (MAC-ELISA), and indirect IgG. ELISA. RT-PCR examination in a number of studies was reported to have successfully detected the dengue virus. This examination has better specificity and sensitivity compared to virus isolation with a fast turn around timeLaboratory tests on dengue infection include hematological, serological and nucleic acid tests that play a role in supporting the rapid and accurate diagnosis of dengue hemorrhagic fever.

A lexical approach for identifying behavioural action sequences.

Animals display characteristic behavioural patterns when performing a task, such as the spiraling of a soaring bird or the surge-and-cast of a male moth searching for a female. Identifying such recurring sequences occurring rarely in noisy behavioural data is key to understanding the behavioural response to a distributed stimulus in unrestrained animals. Existing models seek to describe the dynamics of behaviour or segment individual locomotor episodes rather than to identify the rare and transient sequences of locomotor episodes that make up the behavioural response. To fill this gap, we develop a lexical, hierarchical model of behaviour. We designed an unsupervised algorithm called "BASS" to efficiently identify and segment recurring behavioural action sequences transiently occurring in long behavioural recordings. When applied to navigating larval zebrafish, BASS extracts a dictionary of remarkably long, non-Markovian sequences consisting of repeats and mixtures of slow forward and turn bouts. Applied to a novel chemotaxis assay, BASS uncovers chemotactic strategies deployed by zebrafish to avoid aversive cues consisting of sequences of fast large-angle turns and burst swims. In a simulated dataset of soaring gliders climbing thermals, BASS finds the spiraling patterns characteristic of soaring behaviour. In both cases, BASS succeeds in identifying rare action sequences in the behaviour deployed by freely moving animals. BASS can be easily incorporated into the pipelines of existing behavioural analyses across diverse species, and even more broadly used as a generic algorithm for pattern recognition in low-dimensional sequential data.