Portable Computer Research Articles

Perception of Computer Work Health Impact among Higher Education Students

Beyond professional and IT competencies, sufficient computer work requires adequate workplace design. Applying ergonomic aspects in design and utilization aims to establish and maintain the man-machine system while considering long term impacts. However, the human body is quite adaptive to health-disadvantaged work postures, and it may be adversely affected, which leads to a decrease in work performance as well. This study investigates the relationship between computer use habits, workplace design, work environment, and perceived health impacts among higher education students. The study aims to find the critical factors of computer work for establishing ergonomic development actions. The results are based on the responses of 711 business students from various higher education institutions in Hungary, using a voluntary online survey. Cross-tabulation, ANOVA, and correlation analyses could show that exposition to the risk by workload and wrong workplace selection go together with more health problems. The results show that portable computers are preferred, sitting posture is usually wrongly chosen, tiredness in the upper body is common, but students rated their workplace design rather good. The main experience of the study is that targeted actions are required for protecting the health and improve efficiency in performing computer activities.

المشکلات الإدارية والفنية التي تواجه معلمي ومعلمات المملکة العربية السعودية في برامج التدريب عن بعد

هدفت الدراسة للکشف عن المشکلات الإدارية والفنية التي تواجه معلمي ومعلمات المملکة العربية السعودية في برامج التدريب عن بعد, والحلول المقترحة للتغلب على هذه المشکلات, واعتمدت الدراسة المنهج الوصفي المسحي, مستخدما أداة الإستبانة, وقد تکون مجتمع الدراسة من جميع معلمي ومعلمات المملکة العربية السعودية والبالغ عددهم (525110) معلما ومعلمة, وکانت عينة الدراسة مکونة من (407) معلما ومعلمة, وقد بينت أبرز نتائج الدراسة أن المشکلات الإدارية والفنية التي تواجه معلمي ومعلمات المملکة العربية السعودية في برامج التدريب عن بعد کانت بدرجة کبيرة, وأن أبرز هذه المشکلات الإدارية تمثلت في ضعف آليات متابعة الاقتراحات في مراکز التدريب, وصعوبة تقييم مستوى التفاعل لدى المعلمين والمعلمات في البرامج التدريبية عن بعد, کما تمثلت أبرز المشکلات الفنية في عدم توافر الدعم الفني المباشر لحل المشکلات التي تواجه المعلمين والمعلمات, و صعوبة التسجيل في بعض البرامج التدريبية عن بعد لزيادة الطلب عليها عبر الموقع, کما أوضحت الدراسة أنه لايوجد فروق ذات دلالة إحصائية بين أفراد عينة الدراسة تعزى إلى متغيرات (الجنس- عدد سنوات الخبرة), وکان من أبرز الحلول المقترحة هو إقامة برامج التدريب عن بعد في أوقات مختلفة لمناسبة الجميع, وتجهيز وحدات الدعم المباشر لحل المشکلات التقنية, وتوفير أجهزة حواسيب محمولة بأسعار رمزية للعاملين في التعليم. Abstract The study aimed to uncover the administrative and technical problems facing male and female teachers of the Kingdom of Saudi Arabia in the distance training programs, and the proposed solutions to overcome these problems, and the study adopted the Descriptive Survey Approach, using the questionnaire tool, and the study population consisted of all the teachers (of both genders) of the Kingdom of Saudi Arabia, who are in total (525110) teachers, and the study sample covered (407) teachers, and the most prominent results of the study showed that most of the problems facing Saudi male and female teachers in distance training programs were, to a large extent, the administrative and technical problems. The most prominent of these administrative problems were poor mechanisms for following up suggestions in training centers, and the difficulty of interaction level assessment of teachers in distance training programs. The most outstanding technical problems were the lack of direct technical support to solve the problems facing teachers of both genders, and the difficulty of registration in some distance training programs due to the increasing demand for them on the website, and the study also indicated that there are no statistically significant differences between the study sample individuals due to variables (gender – years of experience). Among the most outstanding solutions proposed were the establishment of distance training programs at different times to suit everyone, equipping direct support units to solve technical problems, and providing portable computers at nominal prices for education workers

Emerging trends in the developments of low power design technique

In this paper is introduced a low power design technique for developing more reliable, functional, and more cost-effective handheld cellular telephones, portable computers, and peripherals. The portability requirements of handheld computers and other portable devices have placed tremendous pressure on electronic equipment designers, who need to deal with restrictions in the size of electronic units and power consumption. Even though battery technology is continuously improving, including reduced power consumption of processors and displays, extensive and continuous use of network services aggravates these issues. Now the onus is on the research and industrial communities to extend battery life and reduce weight. Equally, research on new techniques and technologies continues, to carefully manage energy consumption in mobile devices, while still providing continuous and fast connections to services and applications. This paper also discusses the novel trends in the developments and advancements in the area of low power Very Large Scale Integration (VLSI) design, dynamic power dissipation static power loss in Complementary Metal Oxide Semiconductor (CMOS), and advanced low power technique. Though low power as a well-established domain that undergone lots of developments from transistor sizing, process shrinkage, voltage scaling, clock gating, etc., to adiabatic logic are elaborated.

Genopo: a nanopore sequencing analysis toolkit for portable Android devices

The advent of portable nanopore sequencing devices has enabled DNA and RNA sequencing to be performed in the field or the clinic. However, advances in in situ genomics require parallel development of portable, offline solutions for the computational analysis of sequencing data. Here we introduce Genopo, a mobile toolkit for nanopore sequencing analysis. Genopo compacts popular bioinformatics tools to an Android application, enabling fully portable computation. To demonstrate its utility for in situ genome analysis, we use Genopo to determine the complete genome sequence of the human coronavirus SARS-CoV-2 in nine patient isolates sequenced on a nanopore device, with Genopo executing this workflow in less than 30 min per sample on a range of popular smartphones. We further show how Genopo can be used to profile DNA methylation in a human genome sample, illustrating a flexible, efficient architecture that is suitable to run many popular bioinformatics tools and accommodate small or large genomes. As the first ever smartphone application for nanopore sequencing analysis, Genopo enables the genomics community to harness this cheap, ubiquitous computational resource.

Performance of a Low-Cost Acoustic Insect Detector System with Sitophilus oryzae (Coleoptera: Curculionidae) in Stored Grain and Tribolium castaneum (Coleoptera: Tenebrionidae) in Flour.

Reduction of postharvest losses is gaining increased priority in warm regions where insect infestation may cause rapid deterioration of staple commodities. Acoustic detection can be used to assess the likelihood of insect infestations in bags of grain, flour, and other commodities that are stored in small holdings in developing countries, enabling rapid targeting of treatments. A portable postharvest insect detection system was developed with the goal to provide low-cost capability to acoustically assess infestations in small-scale storage facilities. Electret microphones input pest insect sounds to a 32-bit microcontroller platform that digitized and stored the signals on a digital memory card transferable to a portable laptop computer. The insect sounds then were analyzed by custom-written software that matched their spectra to those of known pests. Infestations of Sitophilus oryzae (L) in 2.6-kg bags could be detected down to densities of 1.9 adults/kg in grain and Tribolium castaneum (Herbst) down to 3.8 adults/kg in flour in laboratory settings. Also, differences in the rates of sounds per insect in treatments with different numbers ranging from 5 to 50 insects suggested that the sound rates of adults of different species at different population densities may be noticeably affected by aggregation pheromones or other behaviorally active semiochemicals. Further testing is needed but previous experience with acoustic detection systems suggests that the prototype has potential for use in small storage facilities where early detection of infestations is difficult to provide.

A portable monitoring approach using cameras and computer vision for bridge load rating in smart cities

Smart structures require novel, efficient, and effective technologies for their safe operation and serviceability. This paper presents a novel, practical, cost-effective, and field test-based methodology using portable cameras and computer vision technologies to identify the lateral live load distribution factors for the existing highway bridges to perform load rating. By using a computer vision-based measurement method and traffic recognition, the girder deflection under live load can be monitored in a noncontact way and can be utilized to derive the load distribution. To verify the feasibility of the proposed approach, a comparative experimental study is conducted on a real-life pre-stressed concrete bridge with a set of conventional load tests and experiments in normal traffic. The results are compared with the conventional approach, such as simplified formulations recommended by AASHTO specifications, and the experimental method using the data from strain gauges and a calibrated finite element model (FEM). The comparative results show that the proposed approach can obtain very similar load distribution factors and bridge load rating factors both in a conventional load test and normal traffic. In comparison to the simplified formulation recommended by AASHTO specifications, the proposed approach can reflect the real-life structural properties and improve the load rating factor of AASHTO specifications by around 12%. In addition, as compared to the load-test-based approaches, such as using strain data and calibrated FEM, the proposed approach does not require traffic closure and a large amount of effort to deal with the load test and model updating. The bridge studied in this paper represents a very typical one from a large population of bridges that are part of the smart infrastructure. Such a practical approach will be practical and cost-effective for bridge load rating in smart cities.

Integration of Internet of Things and blockchain toward portability and low‐energy consumption

AbstractThe modern era of information and technology leverages connectivity and information sharing for enhancing applications and reducing human intervention. The proliferation of Internet of Things (IoT) in almost all aspects of modern life raises major challenges of security and privacy in health care services and the pharmaceutical industry. Blockchain has emerged as a secure technology in a trustless network without central governance. The inherent attributes it provides can solve the security and privacy challenges related to IoT and extend its capabilities. However, traditional instances of Blockchain are not suited for the IoT environment for reasons such as computationally expensive consensus process. Proof of authentication is a lightweight consensus algorithm that can be implemented in the IoT environment. This paper presents an IoT‐friendly Blockchain scheme implemented to evaluate the feasibility of medical supply and drug transportation to aid security and mitigate privacy issues which are fault‐tolerant, transparent, and traceable. The proof of concept implementation on portable single board computer demonstrates proof of authentication consensus algorithm executed with block validation and block addition in 30 and 40 ms while consuming 45 and 60mJ, respectively. Additionally, the network performance of the proposed architecture was presented and evaluated in the application context.

Problematic Facebook use and problematic video gaming as mediators of relationship between impulsivity and life satisfaction among female and male gamers.

Over the past few decades, many new technologies have emerged, such as portable computers, the internet and smartphones, which have contributed to improving the lives of individuals. While the benefits of these new technologies are overwhelmingly positive, negative consequences are experienced by a minority of individuals. One possible negative aspect of new technologies is their problematic use due to impulsive use which may lead to lower life satisfaction. The present study investigated the mediating role of problematic video gaming (PVG) and problematic Facebook use (PFU) in the relationship between impulsivity dimensions and life satisfaction as well as the relationship between impulsivity dimensions and problematic behaviors. Additionally, the potential impact of gender differences was also examined. The study comprised 673 gamers (391 females) aged 17–38 years (M = 21.25 years, SD = 2.67) selected from 1365 individuals who completed an offline survey. PFU was assessed using the Facebook Intrusion Scale, and PVG was assessed using the nine-item Internet Gaming Disorder Scale–Short-Form (IGDS9-SF). Impulsivity dimensions such as attention, cognitive instability, motor, perseverance, self-control, and cognitive complexity were assessed using the Barratt Impulsiveness Scale (BIS-11), and life satisfaction was assessed using the Satisfaction With Life Scale (SWLS). Depending on the specific impulsivity dimension, findings showed both positive and negative relationships between impulsivity and life satisfaction. Attention and perseverance subtypes of impulsivity were primarily associated with problematic behaviors. Additionally, cognitive complexity was associated with PFU among female gamers, whereas cognitive instability was associated with PVG among male gamers. Additionally, PVG was primarily associated with lower life satisfaction. However, there was no mediation effects between impulsivity dimensions and life satisfaction via PFU or PVG. These findings provide a better understanding of the relationship between problematic behaviors, life satisfaction, and impulsivity among gamers and the differences between male and female gamers.

A Rigid-Flex Wearable Health Monitoring Sensor Patch for IoT-Connected Healthcare Applications

The Internet of Things (IoT) is a new communication paradigm that can connect elements from various fields through the Internet. One of the most attractive IoT applications is in the modern healthcare area, as the traditional healthcare system has an increasing demand for social resources, including doctors, nurses, hospital beds, and health monitoring devices. In this article, the design of a compact wearable sensor patch is presented for measurements of different physiological signals, such as the electrocardiogram (ECG), photoplethysmography (PPG), and body temperature. As ECG and PPG sensors are integrated with the same device, the proposed sensor patch can be used to estimate blood pressure (BP) continuously based on the pulse arrival time (PAT) without extra wires and devices. The sensor patch consists of a center board for signal acquisition and processing, a power board for energy supply and charging batteries, and three sensors for vital signs monitoring. All the components are designed in a rigid-flex structure, which can be easily attached to the human body for remote health monitoring applications. The sensors can be detached from the center board for customized measurements of a certain physiological signal (e.g., ECG) to reduce power consumption. Experiments are conducted to validate the performance of the proposed sensor patch by comparison with a commercial reference device. With the integration of a miniaturized Bluetooth low-energy (BLE) module, the proposed sensor system can transmit physiological measurements wirelessly to a gateway. Data encryption is applied on both the sensor patch and gateways to protect data for privacy and security purposes during transmission. Both a mobile gateway (based on smartphones) and a fixed gateway (based on portable computers) are designed as the bridge between the wearable sensor system and the Internet cloud, where health data can be stored and further analyzed. The experimental results demonstrate the feasibility of the overall platform for IoT-connected healthcare applications.

Human-computer multimodal interface to internet navigation

Purpose Propose and develop new multimodal interfaces that allow people with motor impairments to control mass use applications in a natural way through gestures and voice. Methods A multimodal interaction interface was developed for using Google Chrome, Gmail and Facebook applications through gestural and verbal commands. The interface activates mouse and keyboard commands from the processing of voice signals and videos of the user’s head movement. The interface does not disable traditional keyboard and mouse functions; moreover, it only requires a webcam and a microphone, which are usually built into portable computers. Results The tests were performed on three groups of people: young adults, older adults and people with motor impairments. The verbal interaction was tested on a total of 189 voice commands with an average performance of 75.7% and a total of 105 dictations. The dictations had an average of 13 words; the system had a performance of 81.1%. Moreover, the gestural interaction activated 126 commands without errors using a drop-down menu; a click was activated 84 times with a success rate of 70.2%. Conclusion The motor impairments group especially valued the option of using Google Chrome, Gmail and Facebook without physically manipulating a mouse and keyboard. This group showed a greater preference for verbal control than for gestural control. An adaptation period is required for the adults group to acquire greater skill in using the interface. The young adults group preferred the types of interactions they are accustomed to due to their familiarity with Information and Communication Technologies (ICT); they considered the interface fun. Implication for rehabilitation Computers and their applications were conceived with unnatural interaction mechanisms, such as the keyboard and mouse, which prevent their use by people with psychophysiological limitations or digital literacy. For this reason, the need arises to design new natural interfaces commanded by gestures and voice. It is necessary to develop low-cost interfaces that can control mass-use applications such as Google Chrome, Facebook and Gmail, which do not require additional hardware using webcams and microphones, which are usually integrated into laptops. The development of these multimodal interfaces improves the quality of life of people with motor impairments, allowing them to have access to Information and Communication Technologies (ICT).

The Application of Mamdani Method for Predicting The Best Portable Computer Based on Hardware and Price

A portable computer is a technology tool widely used among students and students. With a very helpful role as in typing needs, presentations, and math calculations. A variety of carry-on computers that many certainly make one difficult to determine a decent and good portable computer to use. In general, in the process of selecting a portable computer, there is no recognized standard to determine the recommended portable computer level. The purpose in this research is to produce predictive values that will be a reference in supporting decisions in determining a portable computer that complies with hardware component criteria and pricing. This study implemented FIS Mamdani models with the analysis stage of the formation of fuzzy sets, application of implications function, rule composition and defuzification. The result of this research is an output of predictive value based on hardware component inputs and prices that will assist the user in supporting decisions in determining the best carry-on computer and according to what they want.Keywords: Predictions, Fuzzy Inference System, Mamdani methods, portable computers, students.

Classification and Mapping of Adaptive Security for Mobile Computing

Context: Mobile computing has emerged as a disruptive technology that has empowered its users with portable, connected and context-aware computation. However, issues such as resource poverty, energy efficiency and specifically data security and privacy represents the critical challenges for mobile computing. Objective: The objective of this work is to systematically identify, taxonomically classify and map the state-of-research on adaptive security (a.k.a. self-protection) for mobile computing. Methodology: We followed evidence based software engineering method to conduct a systematic mapping study of 43 qualitatively selected studies-published from 2003 to 2017-on adaptive security for mobile computing. Results and Conclusions: Classification and mapping of the research highlights three prominent themes that support adaptive security for (i) Mobile Device Data and Resources, (ii) Mobile to Mobile Communication, and (iii) Mobile to Server Communication. Mapping analysis suggests that security of mobile device data and resources is the most researched theme. The mapping study highlights that active and futuristic research trends are primarily focused on security as a service, whereas; the frequent research challenges relate to self-protecting mobile devices, user-driven privacy decisions and context-aware security. The results of the mapping study facilitate knowledge transfer that can benefit researchers and practitioners to understand the role of adaptive and context-aware security in mobile computing environments.

Comparison Of DXA And Ultrasound For Measurement Of Body Composition In Physically Active College Students

Body composition is a frequently assessed component of health-related fitness. Recently, a portable computer based A-mode ultrasound system has become commercially available for estimating percent body fat (%fat). If a single-site estimate of %fat is valid against the dual-energy X-ray absorptiometry, this would have immediate implications for assessing body composition in field based settings. However, little is known how these estimates compare with each other. PURPOSE: The aim of this study was to determine the accuracy of the A-mode ultrasound device as a way to estimate %fat. METHODS: Participants %fat was estimated using an A-mode ultrasound device biceps measurement and DXA, which served as the criterion estimate. Participants (75 males, 87 females) were physically active college students [age 21 (SD 3) yrs, height 1.73 (SD 0.10) m, body mass 76.09 (SD 15.74) kg and BMI 25.4 (SD 4.1) kg/m2]. Methods were compared using a Bland-Altman plot with DXA serving as the criterion method. The coefficient of determination and standard error of the estimate were assessed using linear regression. Total error was calculated to determine the average deviation of individual scores from the line of identity. RESULTS: DXA estimate %fat was 25.9 (SD 11.5)% and the A-mode ultrasound estimate was 22.6 (SD 10.9)%. The A-mode ultrasound device underestimated %fat by -3.3 (SD 8.0) % (p<0.00001). With a standard deviation of 8, the calculated 95% limits of agreement (SD x 1.96 ± mean difference) were -12.3 to 19.04% fat. The coefficient of determination was 0.55 with a standard error of the estimate of 7.6 %fat. The average deviation of individual scores from the line of identity was 8.6% (total error). CONCLUSIONS: The development of time efficient methods for estimating %fat are important for better screening large samples; particularly in field settings. Although a single site estimate of %fat is efficient, it did not provide valid estimates when compared to DXA in this population. The limits of agreement were wide, indicating poor agreement between the two assessments of %fat. Future studies may want to consider investigating multiple measures using sites A-mode ultrasound as this may better estimate overall %fat.

The impact of teaching in a one-to-one computing classroom on teachers’ work outside the classroom

ABSTRACT One-to-one computing programmes – that is, when each student has a personal, portable computer to use while learning – have been studied extensively, mostly regarding their actual classroom implementation. In this quantitative study, the authors take a broader perspective, exploring the impact of teaching in one-to-one computing programmes on teachers’ beliefs regarding their job outside the classroom. Participants were middle school and high school teachers who had taught in both one-to-one and traditional classrooms – and hence could reflect upon the differences between the two settings. The methodology included questionnaires based on Danielson’s comprehensive Framework of Teaching. The results suggest more positive attitudes towards teaching in one-to-one programmes than in traditional classrooms in all domains tested; however, the one-to-one instruction applied portrays a rather shallow, instrumental use of the digital devices in a way that supports existing teaching practices and beliefs, rather than a transformative effect of such programmes on teaching.

Data cities and astrospatial architecture: An urban ethos from electromagnetic fluxes

Light remains the origin and sustenance of all forms of life on Earth—but human living is being transformed by ingenious applications of astrospatial technologies that were devised to fly to other planets. This century’s networked architectures of semiconductors, satellites, scanners and sensors manipulate diverse electromagnetic frequencies to convert light into unprecedented formats and contents of data that are destined to inform most human behaviours in future. Telematics and informatics are taking our civilisation far beyond the milieu of modernism enabled by Edison’s 1879 demonstration of electric incandescence, and the transmillennial ‘digital age’ underpinned by portable computers and mobile telephony.

The first laptop in orbit - [Past Forward

It was about the size of a three-ring binder and weighed 4.5 kilograms. Introduced in 1982, the Graphical Retrieval Information Display (GRiD) Compass was the first portable computer to feature a clamshell design. The bright amber of the laptop's 21.6-centimeter plasma screen could be viewed from any angle and under any lighting conditions, according to its maker, GRiD Systems Corp. The computer was also exceedingly rugged. Sales reps claimed they would drop one in front of prospective buyers to show off its durability. With a price tag of US $8,150 (about $23,000 today), the Compass wasn't intended for the consumer market. Instead, it found a home with NASA, becoming standard equipment on space shuttle missions through the early 1990s. The space agency's trust in the computer was not misplaced: Reportedly, the GRiD flying aboard Challenger survived the January 1986 crash.

Precise Active Seeding Downforce Control System Based on Fuzzy PID

Soil compaction is an important procedure of precision seeding operation. In this paper, a precise downforce control system based on fuzzy PID was proposed in order to improve the quality of the soil compaction and the accuracy of setting working parameters. The conventional mechanism of seeders for soil compaction was optimised. The compressing spring of the compaction mechanism was replaced by a linear motor, which is actively controlled to adjust downforce in real time. A force sensor was connected in series with the linear motor to detect the actual downforce from a press wheel acting on soil. The detected downforce was employed as feedback for the fuzzy PID model. A slave real-time control system was constructed by using an STM32 microcontroller. A user interface was designed for the portable master computer system based on the ForLinx embedded platform to facilitate the setting of target downforce and display the actual downforce in real time. Meanwhile, it was able to adjust the system for different operating requirements, such as soil stiffness, moisture, and crop species. Experiments were conducted on a soil bin, and the results indicated that the active control system has better performance than the conventional passive system in downforce control. The downforce was stable with a variance less than 2.6% under different conditions, and it was 8.11% less than the conventional passive system.

When All Products Are Digital: Complexity and Intangible Value in the Ecosystem of Digitizing Firms

During the last four decades, digital technologies have disrupted many industries. Car control systems have gone from mechanical to digital. Telephones have changed from sound boxes to portable computers. But have the firms that digitized their products and services become more valuable than firms that didn’t? Here we introduce the construct of digital proximity, which considers the interdependent activities of firms linked in an economic network. We then explore how the digitization of products and services affects a company’s Tobin's q—the ratio of market value over assets—a measure of the intangible value of a firm. Our panel regression methods and robustness tests suggest the positive influence of a firm’s digital proximity on its Tobin’s q. This implies that firms able to come closer to the digital sector have increased their intangible value compared to those that have failed to do so. These findings contribute a new way of measuring digitization and its impact on firm performance that is complementary to traditional measures of information technology (IT) intensity.

La sustentabilidad en equipos de cómputo portátiles. Un estudio experimental

La visión holística del término sustentabilidad incluye la realidad económica, social, ambiental y político-cultural. Este estudio se limita al proceso ambiental en la relación del ser humano con el uso de la tecnología. La SEMARNAT, en el 2017, menciona la necesidad de lograr una ciudadanía que tenga las competencias para enfrentar estos retos y encontrar soluciones ante la existencia de degradación ambiental, entre muchos otros problemas. Esta investigación tiene un enfoque exploratorio, cuantitativo-experimental y factorial, donde a partir de identificar computadoras portátiles más comunes entre la población estudiantil, se manipulan de manera intencional, exponiéndolas a ciertas pruebas de uso con la medición de un termómetro convencional para después observar las consecuencias. Básicamente, se analizan los efectos en el desempeño de un equipo de cómputo portátil con base en la temperatura ambiente, superficie del área de trabajo y tiempo de encendido del equipo, con la finalidad de dar aportaciones en los hábitos de uso adecuado y con ello contribuir en alargar la vida útil de los equipos que conlleve a la reducción de desechos electrónicos. Los hallazgos encontrados muestran que los hábitos en el uso de estos equipos abonan de una manera positiva (o negativa) a la contaminación del planeta, toda vez que es innegable el aumento en la adquisión de estos. Se concluye con recomendaciones de uso con la finalidad de propiciar buenos hábitos a partir de la planeación y consciencia en la manipulación de computadoras portátiles y, con ello, dejar como evidencia que es posible contribuir con la sustentabilidad desde el área de las tecnologías de cómputo.

Numerical computing on the web: benchmarking for the future

Recent advances in execution environments for JavaScript and WebAssembly that run on a broad range of devices, from workstations and mobile phones to IoT devices, provide new opportunities for portable and web-based numerical computing. Indeed, numerous numerical libraries and applications are emerging on the web, including Tensorflow.js, JSMapReduce, and the NLG Protein Viewer. This paper evaluates the current performance of numerical computing on the web, including both JavaScript and WebAssembly, over a wide range of devices from workstations to IoT devices. We developed a new benchmarking approach, which allowed us to perform centralized benchmarking, including benchmarking on mobile and IoT devices. Using this approach we performed four performance studies using the Ostrich benchmark suite, a collection of numerical programs representing the numerical dwarf categories identified by Colella. We studied the performance evolution of JavaScript, the relative performance of WebAssembly, the performance of server-side Node.js, and a comprehensive performance showdown for a wide range of devices.