Fully Fabric-Based Triboelectric Nanogenerators as Self-Powered Human-Machine Interactive Keyboards

Combination flexible and stretchable textiles with self-powered sensors bring a novel insight into wearable functional electronics and cyber security in the era of Internet of Things.This work presents a highly flexible and self-powered fully fabric-based triboelectric nanogenerator(F-TENG)with sandwiched structure for biomechanical energy harvesting and real-time biometric authentication.The prepared F-TENG can power a digital watch by low-frequency motion and respond to the pressure change by the fall of leaves.A self-powered wearable keyboard(SPWK)is also fabricated by integrating large-area F-TENG sensor arrays,which not only can trace and record electrophysiological signals,but also can identify individuals’typing characteristics by means of the Haar wavelet.Based on these merits,the SPWK has promising applications in the realm of wearable electronics,self-powered sensors,cyber security,and artificial intelligences.

Virtual Keyboard:A Real-Time Hand Gesture Recognition-Based Character Input System Using LSTM and Mediapipe Holistic

In the digital age,non-touch communication technologies are reshaping human-device interactions and raising security concerns.A major challenge in current technology is the misinterpretation of gestures by sensors and cameras,often caused by environmental factors.This issue has spurred the need for advanced data processing methods to achieve more accurate gesture recognition and predictions.Our study presents a novel virtual keyboard allowing character input via distinct hand gestures,focusing on two key aspects:hand gesture recognition and character input mechanisms.We developed a novel model with LSTM and fully connected layers for enhanced sequential data processing and hand gesture recognition.We also integrated CNN,max-pooling,and dropout layers for improved spatial feature extraction.This model architecture processes both temporal and spatial aspects of hand gestures,using LSTM to extract complex patterns from frame sequences for a comprehensive understanding of input data.Our unique dataset,essential for training the model,includes 1,662 landmarks from dynamic hand gestures,33 postures,and 468 face landmarks,all captured in real-time using advanced pose estimation.The model demonstrated high accuracy,achieving 98.52%in hand gesture recognition and over 97%in character input across different scenarios.Its excellent performance in real-time testing underlines its practicality and effectiveness,marking a significant advancement in enhancing human-device interactions in the digital age.

“Keyboard sign”and“coffee bean sign”in the prenatal diagnosis of ileal atresia:A case report

BACKGROUND Ileal atresia is a congenital abnormality where there is significant stenosis or complete absence of a portion of the ileum.The overall diagnostic accuracy of prenatal ultrasound in detecting jejunal and ileal atresia is low.We report a case of ileal atresia diagnosed prenatally by ultrasound examination with the“keyboard sign”and“coffee bean sign”.CASE SUMMARY We report a case of ileal atresia diagnosed in utero at 31 weeks'of gestation.Prenatal ultrasound examination revealed two rows of intestines arranged in an‘S’shape in the middle abdomen.The inner diameters were 1.7 cm and 1.6 cm,respectively.A typical“keyboard sign”was observed.The intestine canal behind the“keyboard sign”showed an irregular strong echo.There was no normal intestinal wall structure,showing a typical“coffee bean sign”.Termination of the pregnancy and autopsy findings confirmed the diagnosis.CONCLUSION The prenatal diagnosis of ileal atresia is difficult.The sonographic features of the“keyboard sign”and“coffee bean sign”are helpful in diagnosing the location of congenital jejunal and ileal atresia.

基于Arduino的智能温湿度控制系统

针对传统温度检测控制装置检测效率不高、精确度不够、稳定性较差、功能单一、可操作性较差和易受外界因素干扰等问题,设计了一种以Arduino为核心的智能温湿度控制系统。该系统兼具温湿度传感器、 OLED显示器、测量压强模块、报警器和火情检测器,同时加入了键盘输入模块,能够更好地实现人机联动,使其具有智能监测温度功能。经模拟实验证明,该系统可操作性强,整体结构简单明了,兼具老式测温仪的优势并且测量数据更加精准,分块化功能更加可靠稳定,具有广泛的应用价值。

Eye-shaped keyboard for dual-hand text entry in virtual reality

We propose an eye-shaped keyboard for high-speed text entry in virtual reality (VR), having the shape of dual eyes with characters arranged along the curved eyelids, which ensures low density and short spacing of the keys. The eye-shaped keyboard references the QWERTY key sequence, allowing the users to benefit from their experience using the QWERTY keyboard. The user interacts with an eye-shaped keyboard using rays controlled with both the hands. A character can be entered in one step by moving the rays from the inner eye regions to regions of the characters. A high-speed auto-complete system was designed for the eye-shaped keyboard. We conducted a pilot study to determine the optimal parameters, and a user study to compare our eye-shaped keyboard with the QWERTY and circular keyboards. For beginners, the eye-shaped keyboard performed significantly more efficiently and accurately with less task load and hand movement than the circular keyboard. Compared with the QWERTY keyboard, the eye-shaped keyboard is more accurate and significantly reduces hand translation while maintaining similar efficiency. Finally, to evaluate the potential of eye-shaped keyboards, we conducted another user study. In this study, the participants were asked to type continuously for three days using the proposed eye-shaped keyboard, with two sessions per day. In each session, participants were asked to type for 20min, and then their typing performance was tested. The eye-shaped keyboard was proven to be efficient and promising, with an average speed of 19.89 words per minute (WPM) and mean uncorrected error rate of 1.939%. The maximum speed reached 24.97 WPM after six sessions and continued to increase.

Pathogenic Bacteria Associated with Different Public Environmental Sites in Mecca City

Background: The hygiene of environmental surfaces from shopping, ATM machines, telephones and computers and miscellaneous sites play role in spreading fecal and total coliform bacteria as well as pathogenic bacteria. Objectives: This study addresses the contaminated common sites by pathogenic or potentially pathogenic bacteria in Mecca, SA. Materials and Methods: A total 648 swab samples were collected and analyzed for presence or absence of pathogenic bacteria. Results: Of the total samples 422 were negative bacterial count (71%) and 226 (29%) were positive. All collected samples (100%) of glass windows in the fish markets were bacterial counted;most dominated was Bacillus spp. (n = 97) and the highest population of species was Enterococcus faecalis (n = 40) and E. coli (n = 16). Conclusion: Some public sites were very contaminated with different types of fecal coliform group of bacteria such as shopping cart handles, inner surfaces and child seats in supermarkets, and the glass windows in the fish market. Acinetobacter haemolyticus and other hemolytic bacteria were isolated from more than site.

iPad太阳能充电键盘上市

近期,可利用太阳能充电的iPad用无线键盘＂Solar Keyboard Folio＂在国外上市,该产品还兼具保护套及支架功能,可用于iPad1、iPad2及新iPad。Solar Keyboard Folio在背面配备了太阳能面板,利用普通的室内光约6小时可为内置充电电池充满电。

NEAR-FIELD SOURCE LOCALIZATION METHOD AND APPLICATION USING THE TIME REVERSAL MIRROR TECHNIQUE

In order to develop the acoustic keyboard for Personal Computer(PC),it is necessary to seek high-precision near-field source localization algorithm for identifying the keyboard characters.First of all,the focusing property of Time Reversal Mirror(TRM) is introduced,and then a mathe-matical model of microphone array receiving typing sound is established according to the realization of acoustic keyboard from which the TRM localization algorithm is carried out.The results through computer simulation show that the localization Root Mean Square Error(RMSE) performance of the algorithm can reach 10-3,which demonstrates that the algorithm possesses a high accuracy for the actual near-field acoustic source localization,with potential of developing the computer acoustic keyboard.Furthermore,for the purpose of testing its effect on actual near-field source localization,we organize three experiments for acoustic keyboard characters localization.The experiment results show that the positioning error of TRM algorithm is less than 1 cm within a provided acoustic keyboard region.This will provide theoretical guidance for the further research of computer acoustic keyboard.

Design of intelligent detecting system based on wireless transmission

An intelligent detecting system based on wireless transmission is designed. Its hardware includes the card reading module, the wireless digital transmission module, the LCD module, the random password keyboard module and a 16×16 lattice word database based on e-Flash MM36SB020. Its software is a communication protocol between the central control computer and the entrance management base station. To resolve the conflicting problems occurred during the data transmission, a method of delaying time at random is proposed.

A method of key positioning based on laser virtual keyboard

The paper puts forward a method of virtual keyboard key positioning based on infrared laser reflection and image processing technology. In this paper, the positioning principle is introduced first. And the experimental system is established based on image acquisition, image transformation, threshold selection and binarization processing and identification of key placement. Tested in the indoor environment, the method can achieve characters input efficiently and accurately. And the key positioning has high accuracy, validity and reliability. So the method which has a high practical value provides a good theoretical basis for design of virtual keyboard application.

让复杂变简单:体验KVM多电脑切换器

什么是KVM？ KVM切换器（简称为KVM）,就是我们通常所说的多电脑切换器,它是Keyboard（键盘）、Video（显示器）和Mouse（鼠标）三个单词的第一个字母组合。

Backlit Keyboard Inspection Using Machine Vision

A robust system for backlit keyboard inspection is revealed. The backlit keyboard not only has changeable diverse colors but also has the laser marking keys. The keys on the keyboard can be divided into regions of function keys, normal keys, and number keys. However, there might have some types of defects： incorrect illuminating area, non-uniform illumination of specified inspection region（IR）, and incorrect luminance and intensity of individual key. Since the illumination features of backlit keyboard are too complex to inspect for human inspector in the production line, an auto-mated inspection system for the backlit keyboard is proposed in this paper. The system was designed into the operation module and inspection module. A set of image processing methods were developed for these defects inspection. Some experimental results demonstrate the robustness and effectiveness of the proposed system.

Windows XP中隐藏的独特工具

重新定义键盘键位 安装成功后，就可以在系统中找到一个名为Remapkey．exe的小工具，它可以来修改键盘的键位。运行程序，界面上面的“Basekeyboard”表示系统中原始的标准键盘键位，下面的“Remapped Keyboard”就是显示自定义后的键位布局。当我们要修改键盘键位时，只要直接川鼠标选中“Base keyboard”处的某一按键，然后将它直接拖动到该键盘上的另一键位上，随后在“Remappod Koyboard”中对应的目标键位就会变成红颜色。

开机提示键盘出错

开机时提示“Keyboard error or no keyboard present”：另一种故障就是开机后，屏幕显示键盘出错信息“Keyboard Lock or Error”。

Keyboard Dependency of Personal Identification Performance by Keystroke Dynamics in Free Text Typing

We have proposed some methods for feature extraction and identification that enable identification of individuals through long-text input as an important topic in keystroke dynamics research. As to the robustness in practical circumstances, there exists a question on the keystroke dynamics how much the recognition accuracy is influenced by the change of keyboard. By comparing the performance in the cases of using the same keyboard and different keyboards, the dependencies on keyboards are evaluated through three implemented experiments for subjects. As a result, it is found that we do not need to worry about the keyboard difference for users whose typing skills reach high level with about 900 or more letters in 5 minutes, and only for the remaining users it would be necessary to register their profile data with respect to each keyboard they use in order to avoid recognition accuracy degradation.

Design of Workspace of Human Fingers and Computer Keyboard Operation

There are more and more complex tools and machinery that need be operated by human fingers in our modem industrial environment. Such as computer keyboards, screwdriver, handle wrench, button and switch. All of those should be designed to work effectively and safely with the operators for whom they were designed. At first, ergonomic consideration in design is reachable; this means the operator＇ s fingertip must be able to reach the operating component. This is generally no question because human ann has much more degrees of freedom required to position his arms, hands and fingers in the three-dimension space. However, some times we need the finger operate with a fixed wrist. For exm＇nple in the case in the typing, the reachable workspace of the finger must take into account in such situation. Finger contacting is the most familiar operation mode of the man-machine system, and the index fmger takes on the primary operation tasks. From viewpoint of ergonomic engineering, the operation component should be placed within the workspace of the fingertip to reduced or eliminate the movement of palm and ann should to the greatest extent during finger manipulation. Therefore the research of the workspace of ginger is significant to the ergonomic design of the operation device. In this paper, the reachable workspace and workspace under direction restrain of contacting for the index finger are determined using serial mechanism model and the Penalty Function Method based on geometric measurement of human body. The optimal operating position and orientation of human finger is analyzed.

东芝SAL-32B型超声诊断仪实时图象区故障检修

故障现象在实时图象区出现垂直间隔均等的亮带.仪器操作“左右选择键”选在L时,“位置选择键”无论选在S.T.U.V时,在实时图象区都存在亮带.若“左右选择键”选在R时,“位置选择键”选在S时,在实时图象区存在亮带,其余三个状态都不存在故障.机器上的其它功能键,不受L/R键影响,都能正常工作.检修过程根据机器的框图来判断故障的范围第一步,测量L/R信号.1、测量DTVC板A10脚,判断问题在DTVC板还是在Key Board板.按动L/R键,测出在A10脚上有电压变化。

Non-specific Arm Pain

Non-specific arm pain is a special clinical condition that can occur in work-related activities that involve maintaining a static position for prolonged periods or repetitive and frequent movements of the hand or entire arm. Such activities include typing on a keyboard, maneuvering a computer mouse, playing musical instruments （such as piano and guitar） and many forms of manual labor. The pain is dull and diffuse; It is localized in the forearm or in the hand but quickly can expand to the entire extremity. Non-specific arm pain is the most frequent type of work-related pain after lower-back pain. It thus has important socio-economic significance as a major cause of absence from work. The designation of ＂non-specific＂ originates from the fact that it has no obvious signs of tissue damage, unlike the ＂specific＂ pain accompanying carpal tunnel syndrome, tenosinovitis de Quervain, or lateral epicondylitis. Suggested causes of the pain include microtrauma of soft tissue followed by an inflammatory reaction, ischemia, fatigue, hyper-sensitization of nociceptors, focal dystonia of the hand and/or psychological stress. Treatment consists of application of NSAIDs, physical modalities, stretching and aerobic exercises. Prevention focuses on ergonomic modification during manual labor or work on a computer.

体验无线好选择 Logitech Cordless Desktop EX90

如果说我们测试过的Logitech NewTouch Keyboard 100是有线键盘产品中的标准选手的话．那么Logitech Corcless Desktop EX90毫无疑问就是无线键盘鼠标套装中的标准选手。

创意使然，微软蓝牙无线便携键盘Arc Keyboard

简约是一种态度，创意代表了你的未来。与生活时尚相结合的便携无线键盘，在你的心目中是什么样子？也许无数人有无数的想法，但是，微软Arc键盘绝对是一款时尚经典力作。