Lock Device Research Articles

Face Recognition-Based Door Lock Security System Using TensorFlow Lite

A door security system utilizing face recognition technology based on TensorFlow Lite has been developed to enhance access security and convenience. This research aims to design a system capable of accurately recognizing faces in real time, integrating it with door lock devices, and ensuring user data security. Employing the waterfall method, the system was implemented using an ESP32-CAM microcontroller and deep learning algorithms. Testing results demonstrated a face recognition accuracy of 91% in identifying and processing commands from 200 trials with ten facial variations. Successful integration with door lock devices was achieved through serial communication. The system also features activity log recording for monitoring purposes. This solution offers greater practicality and security than RFID systems as it eliminates the need for physical cards. This research contributes to developing more sophisticated and user-friendly home security systems, with the potential for further enhancements in recognition capabilities under various lighting conditions and integration with other biometric technologies

Research on a Locking Device for Power-Off Locking and 2-DOF Backward Motion Suppression of a Piezoelectric Platform

Inertial positioning platforms driven by piezoelectric actuators have been employed in many precision applications. However, challenges including unstable pose keeping and intractable displacement backward still exist. In this study, a locking device is designed and embedded in a piezoelectric inertial rotary platform to achieve the functions of power-off locking and 2-DOF backward motion suppression. The vertical output displacement of the locking end is converted from the horizontal elongation of the PZT stack by the flexible hinge mechanisms of the locking device, which is used to lock the rotor of the rotary platform. Theoretical and simulation analyses of the locking mechanism are performed and its dominant parameters are optimized. A prototype is fabricated and a series of experiments are performed. Compared with the inertial rotary platform without the locking device, the locking ability is increased by 4.55 times and the backward ratio is reduced from over 60% to below 12%. The application of locking device not only improves the pose keeping ability of the inertial positioning platform, but also improves its displacement output characteristics through backward motion suppression.

Impact of coupled effects of airtight components at variable cross-section location on vehicle airtightness in Wuhan metro

To determine the variation in airtightness performance of metro trains under the coupling state of airtight components, a field-based experimental approach was employed to test the air pressure changes during metro train operations. The study analyzed the impact of the coupling effects of the air conditioning pressure wave protection valve, pneumatic auxiliary door lock devices, and passageway drainage plug on the interior pressure changes of the train while operating in challenging environmental conditions. Following industry standards, the assessment evaluated whether the rate of interior pressure change and the train’s dynamic sealing index met the specified requirements. The findings indicate that, with airtight components in an enabled state, the peak-to-peak value of interior pressure change relative to external pressure change decreased by 15% to 39%. Conversely, when airtight components were not enabled, the reduction was only 0% to 25%. Under enabled airtight component conditions, the train’s dynamic sealing index was within the 2-3 s range, whereas in the disabled state, the dynamic sealing index was less than 1 s. The activation of airtight components plays a crucial role in improving train airtightness by significantly reducing the amplitude of interior pressure changes, thereby ensuring both train airtightness and passenger comfort. The results provide valuable insights for the optimization of train design and operation in order to maintain passenger safety and comfort.

RE-DESIGN TANGGA PESAWAT UNTUK LOADING DAN UNLOADING KURSI PADA PESAWAT AIRBUS 320 NEO DI PT BAT

PT. Batam Aero Technic which is a subsidiary of Lion Air airline that focuses on Maintenance, Repair and Overhaul (MRO) or maintenance of aircraft. One of the maintenance in the BAT hangar is the maintenance of the aircraft cabin section which is commonly called the Cabin Base Maintenance (CBM) Division. The CBM Division is responsible for the interior of the aircraft, starting from small to large scale repairs. In the initial observation, there was the biggest complaint of work posture of 66.67%, pain in the upper neck when lifting airplane seats manually and using stairs that did not fit properly. So it is important to design a tool to reduce musculoskeletal complaints. The aim of the research is to design ergonomic stairs using the EFD method to determine design specifications and meet user needs and anthropometric measurements with NBM. Then, a survey by distributing questionnaires to obtain the design parameters of the transportation equipment developed with the results of the unloading size with Dimension Platform 4,14 m x 404 m, Height Min 1 m | Max 4,5 m, Structure Materials Body and Frame : Structure Steel with Coating, Electrical Control Panel Specification Remote Control / Wireless, Control panel box, Motor 1.5 HP 380 volt 3 phase, Flow Rate 3.2 LPM/210 bar. Others Specification Included, Hydraulic Jack Mounting, Tire Wheel c/w steering towing, Aluminum platform layer Railing, Rubber Bumper, Manual Box, Safety Locking Devices, 2 sets of Rack Gear with Electric Solenoid Release. The design developed is valid according to user needs and according to the 5% significance level and is better than the prefix design due to a more ergonomic ladder position and faster loading/unloading seats.

IoT Security Solutions for Students’ Laboratory with RFID-based Attendance Authentication

The study aims to secure computer laboratories coupled with smart and automated attendance monitoring. It was designed at Isabela State University Cauayan City Campus, specifically at the Computer Laboratory of the College of Computing Studies Information and Communication Technology. The system is web-based and it can be utilized on any OS platform by specifying the IP Address through a web browser. Its function is a complete user interface for its target user's attendance monitoring and management where it can record teachers’ and students’ attendance, classroom entry logs, and calculation of tardiness and absences. It has the capability to retain current and previous records which could be used for future educational reference, entry log history, or for security references. The factor of acceptability as to technical support and processes of the system gained a general weighted mean of 4.35 (sd=.490) which means there is an evaluator's agreement with the functionality of the developed system based on ISO 25010 standards. The system does not physically identify the user but will only be registered in the database through scanning of the RFID tag. Furthermore, in order to achieve the objectives, The system used Php and its MySQL Local Database as its application software. Hardware components include RFID Reader and RFID Card Communication, and Arduino Uno to control Solenoid lock devices, providing security and restriction in every Computer Laboratory room.
 Keywords: Internet of Things, IoT-based Security Solution, Attendance Monitoring, Smart Laboratory

Design Optimization of Cooling Channels and Molding Conditions in Injection Molds for Minimizing Warpage of Automobile Door Locking Device Component

Design Optimization of Cooling Channels and Molding Conditions in Injection Molds for Minimizing Warpage of Automobile Door Locking Device Component

Seismic Behavior of the Combined Viscous-Steel Damping System for a Long-Span Suspension Bridge Considering Wave-Passage Effect

This study investigates the working mechanism and seismic behavior of the Combined Viscous-Steel Damping System (CVSDS) considering the longitudinal wave-passage effect. In the CVSDS, the operational status of the fluid viscous damper (FVD) and the steel damper (SD) can be switched by the fuse–lock device (FLD), which is triggered by the output force of the FVD. The configuration and working mechanism of CVSDS are introduced in detail. A test model is manufactured and examined by cyclic tests to verify its fusing–locking function during cyclic motions. The numerical model of CVSDS is proposed based on the experimental result. The fusing–locking behavior and seismic reduction effectiveness of CVSDS installed in a long-span bridge is analyzed, in which the wave-passage effect is considered. The results show that the fuse–lock function under dynamic loading can be achieved by the proposed FLD. The occurrence condition of the locking mechanism activation depends on the viscous damping force. The traveling wave will induce a delay of the locking time, cause large locking intervals between CVSDSs installed at different positions, and lead to a larger required moving capacity of the CVSDSs. The mitigation effectiveness of CVSDS is significantly reduced due to the wave-passage effect.

Design and Analysis of a Single-sided Hook-type Structural Lock with Eccentric Wheel

In order to reduce the lander load during the docking process during the docking of the manned lunar lander and the cruise, this paper designs and introduces a kind of unilateral hook type structural lock with eccentric wheel. This mechanism can reduce the quality of the lander docking device and achieve the technical requirements of locking and unlocking between the two spacecraft. Based on the mathematical model and three-dimensional entity model of the structural lock device, the motion law is solved and simulated by Matlab and Adams software respectively. Then the theoretical and simulated motion data are compared to verify that the modified structure lock can complete the established design requirements.

489 A RARE CASE OF LEAD EXTRACTION

Abstract Aims Poor data exist about the leadless PM implantation through a bioprosthetic tricuspid valve. Bioprosthetic tricuspid valve has traditionally represented a relative contraindication to transvenous right ventricular pacing for possible tricuspid bioprosthetic valve damage and dysfunction. Therefore, epicardial pacing is usually preferred to transvenous right pacing through a bioprosthetic tricuspid valve for the deleterious effect of permanent pacing leads on tricuspid bioprosthetic valve function and regurgitation. Methods Our case focuses on a 62-year-old woman with mechanical mitral and biological tricuspid prosthesis due to rheumatic disease since 2007 and with a PM-DDDR for a postsurgical complete atrioventricular block. A lead was implanted in right atrium while another lead was implanted in the coronary sinus (CS) instead of in the right ventricle following the presence of a biological tricuspid prosthesis. In February 2022, she did a replacement of pacemaker (PM) generator to another hospital due to initial battery depletion. In March she described pain at the device pocket and consequent appearance of pocket infection. For this situation she was admitted to our cardiac department. A transesophageal echocardiography (TEE) was performed and showed normal biventricular size and function (LVEF 55%), normal function of valve prostheses and absence of vegetations both on the valves and atrial lead. Subsequently an angiography was performed and revealed little patency of the anonymous-caval-subclavian left axis. We made a diagnosis of pocket infection and decided to extract leads in March. We proceded through debridement of leads and removal of the PM generator. After placing Spectranetics (Philips) Lead Locking Device n.2 (LLD2) along the 2007 right atrial lead, we removed it through the use of a mechanical extractors (Cook 7-8.5 Fr). Then after placing Spectranetics (Philips)Lead Locking Device E (LLDE), the CS lead was completely removed through the use of a mechanical extractors (Cook 7-8.5 Fr) and specific delivery.The procedure was well tolerated and uneventful. Following the negative result of the post-extraction blood cultures, cultures of lead tips and pocket swab, together with the normalization of inflammation indices (WBC and CRP) and to the end of antibiotic therapy, we decided to reimplant the device.For the presence of valve prostheses and the patient's high infectious risk, we decided to implant a leadless PM. Results At the beginning of April we performed a leadless Micra AV PM implantation through 23-F Micra TPS delivery catheter across a tricuspid bioprosthetic valve in the right ventricular apex instead of the middle septum due to implantation difficulties for the concomitant presence of the bioprosthetic valve. The procedure was well tolerated and uneventful too. She was discharged after 72h in good conditions. Conclusions We present an unusual case of lead extraction for the second infection of the device pocket in a patient with mechanical mitral and biological tricuspid prostheses and a lead in coronary sinus for the presence of biological tricuspid prosthesis. Leadless PM implantation represents a new technology by eliminating the risks connected with the presence of the lead across the bioprosthetic valve.

Impact Analysis of Thermo-mechanical Deformation to the Unlocking Performance of Locking Device for Manipulator on Chinese Space Station

As one kind of large-scale on-orbit deployable motion mechanism, the launch state of the manipulator on the Chinese Space Station is fixed on the external surface of the Tian-He module by 41 locking-releasing devices. It covers an area of 3.5 meters in arc length and 4.6 meters in length. The locking-releasing device should not only be able to withstand the environmental load conditions of the launch stage and in-orbit stage but also can release the manipulator reliably after going through the thermal and dynamic changes. Three factors cause the deformation of the locking-releasing device before unlocking the manipulator. The first deformation is caused by the module from the atmospheric conditions to the vacuum conditions. The second deformation is thermal deformation which is caused by the temperature changes in the module and manipulator. The locking-releasing devices bear the overload force during the launch stage will cause the third deformation. The numerical simulating analysis shows that the deformation is not beyond the allowable range. The manipulator was unlocked successfully after it was launched together with the Tian-He module. It is verified that the deformation caused by the change of thermo-mechanical conditions from the launch stage to the orbit stage does not affect the unlocking performance of the locking-releasing device.

Development of a Fast-Acting Locking Device for Gas-Distribution Systems from an Elastic Polymer Material

Development of a Fast-Acting Locking Device for Gas-Distribution Systems from an Elastic Polymer Material

Selection and Use of Firearm and Medication Locking Devices in a Lethal Means Counseling Intervention.

Background: While some suicide prevention initiatives distribute locking devices for firearms and medication, little evidence exists to guide the selection of devices. Aims: This study aimed to describe safety standards for locking devices and compare parental acceptance rates for different types of devices. Method: As part of the larger SAFETY Study, behavioral health clinicians provided free locking devices to parents whose child was evaluated in the emergency department (ED) for a suicide-related or behavioral health-related problem. For logistical reasons, we changed the specific devices offered midstudy. Data on device use came from follow-up interviews with 226 parents. Results: Few effective standards exist for locking devices for home use; we could easily break into some. At follow-up, twice as many gun-owning parents were using ED-provided handgun lockboxes as cable locks (28% vs. 14%, p = .02). Overall, 55% of parents reported using an ED-provided medication lockbox, with more using the drawer-sized lockbox than the larger, steel toolbox (60% vs. 42%, p < .01). Limitations: Storage outcomes are from parents' self-report and from one state only. Conclusion: Parents appeared to prefer some devices over others. Our findings suggest the need for (a) effective safety standards, (b) affordable devices meeting these standards, and (c) further research on consumer preferences to ensure use.

Vital Necessity of Total Pacemaker Lead Extraction Following Heart Transplantation

Introduction A 53-year-old patient was admitted through our emergency room presenting high fever and sudden fatigue six months after a high-risk heart transplantation (HTx) due to dilated cardiomyopathy and valvular heart disease. Several pacemaker leads and a CRT(D) device were initially abandoned intracorporeally due to extensive thrombosis surrounding the leads. Hemodialysis was initially necessary through an implanted Demers atrial catheter due to postoperative acute kidney injury (AKI) for a total of six months. Case Report The patient was urgently transferred to our ICU with advancing sepsis for immediate broad antibiotic therapy as well as catecholamine-assisted stabilization of hemodynamics. Following total renal recovery, the Demers catheter was successfully removed. Blood cultures revealed a colonization with staphylococcus aureus (MSSA) and candida glabrata, which led to additional antimycotic therapy. Transesophageal echocardiograms excluded an endocardial infestation twice. After achieving stable status, a decision for a high-risk transvenous lead extraction as most-probable focus of infection was made. The CRT-D-device was removed through a left pectoral incision. After lead stabilization with a Lasso Snare and Liberator Lead Locking Device through a femoral, venous sheath, an excimer-laser was implemented to release and extract the right-atrial and right-ventricular leads. Next, the four remaining leads were uncovered through a right pectoral incision and stabilized using a Liberator Lead Locking Device. These were then extracted using a mechanical extraction sheath (Cook Evolution RL). Chest X-rays excluded remaining foreign material. Following surgical removal of all remaining leads and antimicrobial therapy for six weeks, the patient was discharged with normal inflammation parameters and fully recovered. Summary Due to the necessary immunosuppression, patients following HTx show an elevated risk for major infection and rapid development to sepsis, when foreign material is abandoned intracorporeally. Based on this study case, we strongly recommend total extraction of remaining pacemaker leads as soon as possible to avoid severe infection-related complications after HTx. A two-stage transvenous lead extraction with an excimer-laser seems to enable the safest path for extraction of heavily thrombosed pacemaker leads. A 53-year-old patient was admitted through our emergency room presenting high fever and sudden fatigue six months after a high-risk heart transplantation (HTx) due to dilated cardiomyopathy and valvular heart disease. Several pacemaker leads and a CRT(D) device were initially abandoned intracorporeally due to extensive thrombosis surrounding the leads. Hemodialysis was initially necessary through an implanted Demers atrial catheter due to postoperative acute kidney injury (AKI) for a total of six months. The patient was urgently transferred to our ICU with advancing sepsis for immediate broad antibiotic therapy as well as catecholamine-assisted stabilization of hemodynamics. Following total renal recovery, the Demers catheter was successfully removed. Blood cultures revealed a colonization with staphylococcus aureus (MSSA) and candida glabrata, which led to additional antimycotic therapy. Transesophageal echocardiograms excluded an endocardial infestation twice. After achieving stable status, a decision for a high-risk transvenous lead extraction as most-probable focus of infection was made. The CRT-D-device was removed through a left pectoral incision. After lead stabilization with a Lasso Snare and Liberator Lead Locking Device through a femoral, venous sheath, an excimer-laser was implemented to release and extract the right-atrial and right-ventricular leads. Next, the four remaining leads were uncovered through a right pectoral incision and stabilized using a Liberator Lead Locking Device. These were then extracted using a mechanical extraction sheath (Cook Evolution RL). Chest X-rays excluded remaining foreign material. Following surgical removal of all remaining leads and antimicrobial therapy for six weeks, the patient was discharged with normal inflammation parameters and fully recovered. Due to the necessary immunosuppression, patients following HTx show an elevated risk for major infection and rapid development to sepsis, when foreign material is abandoned intracorporeally. Based on this study case, we strongly recommend total extraction of remaining pacemaker leads as soon as possible to avoid severe infection-related complications after HTx. A two-stage transvenous lead extraction with an excimer-laser seems to enable the safest path for extraction of heavily thrombosed pacemaker leads.

Development of a Smart Cabinet Lock Based on Finger Vein Technology

In response to the requirements for the security and recognition accuracy of cabinet locks in communications, electric power, energy, chemical, IDC computer rooms, daily homes, and other occasions, a smart cabinet lock with multiple door-opening methods based on finger vein biometric technology is developed. The main method to unlock the cabinet is via finger vein unlocking; that is, the identification and verification of information by analyzing the pattern of the veins on the finger, and the achievement of identity verification and identification through biological detection. At the same time, it supports IC or ID card unlocking and mechanical manual unlocking. In order to simplify the overall structure, the internal mechanical structures of the aforementioned three unlocking methods are simplified into one. Its design focuses on the hybrid mechanical transmission structure and the finger vein module as well as utilizes the functions of each module. The principle is divided into blocks. Through processing and purchasing, the smart cabinet lock device is assembled, and its initial functional requirements are tested with physical objects. From the test results, it can be appreciated that the structural size, unlocking method, and two-way unlocking function of the smart cabinet lock meet the requirements, and its recognition accuracy is high, with good security and certain practical application prospects.

Generative Deep Learning to Detect Cyberattacks for the IoT-23 Dataset

The rapid growth of Internet of Things (IoT) is expected to add billions of IoT devices connected to the Internet. These devices represent a vast attack surface for cyberattacks. For example, these IoT devices can be infected with botnets to enable Distributed Denial of Service (DDoS) attacks. Signature-based intrusion detection systems are traditional countermeasures for such attacks. However, these methods rely on human experts and are time-consuming in terms of updates and may not exhaust all attack types especially zero-day attacks. Deep learning has shown some promise in intrusion detection. This paper shows that it is possible to use generative deep learning methods like Adversarial Autoencoders (AAE) and Bidirectional Generative Adversarial Networks (BiGAN) to detect intruders based on an analysis of the network data. The recently posted full IoT-23 dataset based on Somfy door lock, Philips Hue and Amazon Echo devices was used to train generative deep learning models to detect a variety of attacks like DDoS, and various botnets like Mirai, Okiruk and Torii. Over 1.8 million network flows were used to train the various models. The resulting generative models outperform traditional machine learning techniques like Random Forests. Both AAE and BiGAN-based models were able to achieve an F1-Score of 0.99. A BiGAN to detect unknown attacks was also trained to detect novel zero-day attacks with an F1-Score from 0.85 to 1.

Evaluation of setup errors of immobilization device for radiation therapy in companion animals.

Intensity-modulated radiotherapy (IMRT), which allows generating steep dose gradients, is a beneficial treatment for companion animals with adjacent target and risk organs. IMRT is essential for high setup accuracy for avoiding overdose to risk organs, and optimal radiotherapy is important for evaluating the setup accuracy of companion animals. To use an immobilization device to evaluate setup errors in radiotherapy for companion animals. We calculated setup errors in radiotherapy for 386 animals (dogs and cats; 3,261 registration images) that underwent radiotherapy between 2016 and 2022. The companion animals were immobilized with a customized bite block and vacuum lock device. A quantile-quantile plot with 95% confidence interval (CI) was used to evaluate the histogram of the setup errors, and the systematic and random setup errors were calculated for each region (brain, head and neck, chest and abdomen, pelvis, and spine). The setup error in each direction presented an extremely narrow-interval histogram, with the following lower and upper 95% CIs: cranial-caudal (-0.08, -0.06 cm); left-right (-0.04, -0.02 cm); and dorsal-ventral (-0.13, -0.11 cm). The mean systematic setup error was 0.16 cm (range: 0.12-0.36 cm), and the random error was 0.15 cm (range: 0.08-0.34 cm). The pelvis showed the highest systematic and random setup errors (mean: 0.36 and 0.23 cm, respectively). The use of an immobilization device enables highly accurate radiotherapy for companion animals (95% CI < 0.15 cm).

Radio Frequency Identification (RFID)-Based Validated Electronic Lock for Automatic Monitoring System

This study aims to create a prototype of an electronic key system using internet of things-based RFID with a validated monitoring system with registered data. This system is applied to the door of the Integrated Laboratory of the Department of Electrical Engineering, University of Lampung. The electronic keys that are created are very difficult to break into and also easy to change the access secret code to maintain confidentiality. The developed electronic door lock device has strong security reliability with code validation. The code validation block serves as a door unlock determinant. The validated data will produce a signal 1 which will drive the actuator, in this case the door lock solenoid, to work (lock open). The security code has 2554 combinations. To access the door from outside, the RFID tag should be registered in the database and permitted by administration and the ID number data is on the processor. The counter will count the number of people who pass through the door, if more than one person then the buzzer will sound. Then the door lock solenoid is closed and will lock the door again. From the experimental results it is found that this system can work well with a minimum delay of 1.8 s obtained at a distance between devices of 5 m.

An Inexpensive In Vitro Blood-Feeding System for Wild Aedes albopictus (Diptera: Culicidae)

An Inexpensive <i>In Vitro</i> Blood-Feeding System for Wild <i>Aedes albopictus</i> (Diptera: Culicidae)

A Two-Stage Variable Compression Ratio System for Large-Bore Engines with Advanced Hydraulic Control Circuit and Mechanical Locking Device

A Two-Stage Variable Compression Ratio System for Large-Bore Engines with Advanced Hydraulic Control Circuit and Mechanical Locking Device

Smart Door for Handicapped People via Face Recognition and Voice Command Technique

Smart home indicates an application for different technological implementations, it could indicate any system which controls the door lock and several other devices. Facial identification which is an important section to achieve surveillance and safety, especially for handicapped people, can be considered as one of the ways that deal with biometrics and performed to identify facial images via utilizing fundamental features of the face. A Raspberry Pi-based face recognition system using conventional face detection and recognition techniques is going to be supplied, so the method in which image-built biometrics uses a Raspberry Pi is described. The aim of the paper here can be considered as transferring face recognition to a level in which the system can replace the utilizing of RF I-Cards and a password to access any system of security and making the system alive and protect the door from being open by hackers, especially by using the picture of an authorized person, we make the raspberry pi turn off and cannot turn on only by a command from the authorized person's mobile. The result of the presented proposal is a system that uses face recognition by utilizing OpenCV, Raspberry Pi, and it functions on an application of Android, and this system percentage becomes 99.63%. It should be cost-effective, of high performance, secured, and easy to use, which can be used in any smart home application.