There are approximately 39 million blind people worldwide, and 246 million people suffer from amblyopia. However, the number of qualified guide dogs worldwide is far less than the demand. And the training cost of a guide dog is as high as 25,000-3,000 US dollars, the training period is up to 18 months, and the working life is only 8-10 years. And many public places still prohibit the entry of guide dogs, which also brings great troubles for the lives of the blind. From the perspective of guide dogs, they also sacrificed their own instinct to play, because they need to resist foreign interference and temptation when they work. The Doogo team at Tsinghua University's GIX Academy hopes to help blind people travel more easily, and hopes to allow more businesses to build a blind and friendly environment. Inspired by guide dogs, the team developed the electronic guide dog Doogo. Doogo has navigation, obstacle avoidance and other functions, similar to guide dogs, blind users only need to hold the drawbar to follow Doogo's route. The Doogo's front fuselage is equipped with a lidar and depth camera to help blind users navigate and avoid obstacles. It uses a 4400mAh lithium battery that can support 3-4 hours of use after full charge. For the situation of going up and down, Doogo did not use the power-consuming foot design. Team captain He Wei told the author that they had conducted blind user surveys. Most blind users can accept handcuffs in the case of going up and down. equipment. In the future, Doogo's weight will be roughly 3.5-4kg, which will not only help the traction, but also make the experience of the blind hand not too bad. He Wei said that the shape of the prototype is now made using the development platform, and the height is relatively short, sacrificing the lower elevation angle of the depth camera in front of the fuselage. In the future, they will optimize the structural design and increase the position of the camera to detect a wider range of heights. The Dorogo's Lidar has a detection range of approximately 25-30 meters and an accuracy of 3 cm. It accurately detects and senses obstacles in the surrounding environment. The built-in SLAM algorithm helps in real-time navigation and obstacle avoidance. Team member Yue Yang told the author that it is enough to use the laser detection radar-based SLAM module for obstacle avoidance. Doogo also has a depth camera with a detection range of about 15-20 meters for two purposes. On the one hand, it is to achieve dynamic planning, because for the blind, the obstacles around it have many dynamic objects, such as pedestrians and vehicles, in addition to static objects. Obstacle avoidance algorithms for fixed objects in the market are already common, and obstacle avoidance for dynamic objects requires consideration of many factors, such as whether the detected conflict is dangerous. If it is dangerous, which conflict should be avoided first? Doogo's core technical barrier lies in the team's long-term technology accumulation of self-developed conflict analysis algorithms, through the movement speed and trajectory of captured blind users and surrounding moving objects, and according to the movement of moving objects between the past few short periods of time. Trends to analyze whether a dynamic obstacle has avoided a blind user, so that a real-time risk assessment can be performed and the controller will act accordingly.
A digital Hotel Safe is a secure storage device found in hotel rooms that uses electronic technology to provide guests with a secure place to store their valuables. Unlike traditional hotel safes, which typically use a physical key or combination lock, digital hotel safes use a digital keypad or touchscreen interface to allow guests to set their own unique passcode.
Digital hotel safes offer several advantages over traditional safes. Firstly, they are more convenient to use, as guests can easily set and change their own passcodes without needing assistance from hotel staff. Secondly, they provide a higher level of security, as the passcodes are typically encrypted and more difficult to guess or crack compared to physical keys or combinations.
In addition to the passcode entry, digital hotel safes may also offer additional security features such as an audit trail, which records the date and time of each access attempt, as well as a tamper-proof design to prevent unauthorized access.
Digital hotel safes come in various sizes and designs to accommodate different types of valuables, such as laptops, jewelry, passports, and cash. They are typically mounted securely to a wall or inside a cabinet to prevent theft or unauthorized removal.
Overall, digital hotel safes provide guests with a convenient and secure way to store their valuables during their stay, giving them peace of mind knowing that their belongings are protected.
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