世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264887
K. Sundaresan
{"title":"Making Mobile Networks Fly","authors":"K. Sundaresan","doi":"10.1145/3264877.3264887","DOIUrl":"https://doi.org/10.1145/3264877.3264887","url":null,"abstract":"Advances in mobile (cellular) networks have ushered in an era of abundant connectivity. However, the stationary and expensive nature of their deployment has limited their ability to provide true \"ubiquitous\" connectivity under the 5G vision - especially to areas where connectivity is sparing or nonexistent (e.g. rural areas), has been compromised (e.g. disasters), or demands are extreme (e.g. venues/hotspots). The recent advances in un-manned aerial vehicle (UAVs) technology have the potential to change the landscape of wide-area wireless connectivity by bringing a new dimension - \"mobility\" to the cellular network infrastructure itself. By deploying base stations on each of the UAVs, service providers can now deploy and tear-down these cellular networks \"in the sky\" in an on-demand and flexible manner. This allows them to supplement static mobile networks in areas where additional connectivity is needed, or provide stand-alone connectivity in areas where existing mobile networks are either absent or compromised. However, realizing this vision of deploying heavy-weight cellular networks (e.g. LTE) on light-weight, resource-constrained platforms such as UAVs, faces several formidable challenges both in design and deployment. This is complicated by the complex nature of cellular networks that involve multiple interacting components - radio access network (RAN), evolved packet core (EPC) network and backhaul transport network. In this talk, I will present our system \"SkyLiTE\"-- one of the first efforts to design and deploy an on-demand, end-to-end, multi-cell LTE network (on UAVs) that can self-configure itself in the sky. I will discuss how SkyLiTE re-architects the various components (RAN, core and backhaul) of a cellular network to make it deployable on challenging UAV platforms in highly dynamic environments. We believe the validation of SkyLiTE in real-world deployments, will help contribute to a new era of mobile networks that can fly and make connectivity both abundant and ubiquitous.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"55 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84500603","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264882
Manikanta Kotaru, S. Katti
{"title":"Position Tracking for Virtual Reality Using Commodity WiFi","authors":"Manikanta Kotaru, S. Katti","doi":"10.1145/3264877.3264882","DOIUrl":"https://doi.org/10.1145/3264877.3264882","url":null,"abstract":"Today, experiencing virtual reality (VR) is a cumbersome experience which either requires dedicated infrastructure like infrared cameras to track the headset and hand-motion controllers (e.g. Oculus Rift, HTC Vive), or provides only 3-DoF (Degrees of Freedom) tracking which severely limits the user experience (e.g. Samsung Gear VR). To truly enable VR everywhere, we need position tracking to be available as a ubiquitous service. This paper describes WiCapture, a novel approach which leverages commodity WiFi infrastructure, which is ubiquitous today, for tracking purposes. We prototyped WiCapture using off-the-shelf WiFi radios and demonstrated that it achieves an accuracy of 0.88 cm compared to sophisticated infrared-based tracking systems like the Oculus Rift, while providing much higher range, resistance to occlusion, ubiquity and ease of deployment.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84483989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264883
Raghav H. Venkatnarayan, Muhammad Shahzad
{"title":"Recognizing Gestures with Ambient Light","authors":"Raghav H. Venkatnarayan, Muhammad Shahzad","doi":"10.1145/3264877.3264883","DOIUrl":"https://doi.org/10.1145/3264877.3264883","url":null,"abstract":"There is growing interest in the research community to develop techniques for humans to communicate with the computing that is embedding into our environments. Researchers are exploring various modalities, such as radio-frequency signals, to develop gesture recognition systems. We explore another modality, namely ambient light, and develop LiGest, an ambient light based gesture recognition system. The idea behind LiGest is that when a user performs different gestures, the user's shadows move in distinct patterns. LiGest captures these patterns using a grid of floor-based light sensors and then builds training models to recognize unknown shadow samples. We design a prototype for LiGest and evaluate it across multiple users, positions, orientations and lighting conditions. Our results show that LiGest achieves an average accuracy of 96.36%.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"25 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75059808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264886
R. Likamwa
{"title":"Realizing Mixed Reality through Mobile Systems Research","authors":"R. Likamwa","doi":"10.1145/3264877.3264886","DOIUrl":"https://doi.org/10.1145/3264877.3264886","url":null,"abstract":"The emergence of mobile mixed reality (MR) and augmented reality (AR) frameworks portends a future of computational immersion, placing virtual objects amidst physical environments. As MR and AR become increasingly accessible and programmable, immersive media experiences will enhance education, training, navigation, productivity, cultural exhibits. However, to sustain MR and AR use cases, mobile systems will be challenged with system bottlenecks to energy efficiency, computational performance, device security, and user privacy. These bottlenecks stem from the visual sensing needs and graphics-intensive workloads that power MR and AR. Properly contextualized and adjusted, a variety of prior mobile systems research projects can find relevance in these emerging paradigms, leveraging continuous mobile vision, edge computing, mobile graphics processing, etc. Further advances can come from future mobile systems research projects. Together, the mobile systems research community can realize these immersive paradigms in our future mobile devices.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"10 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81811443","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264879
M. Inamullah, B. Raman
{"title":"Frame Aggregation in 802.11ac: Need for Modified Block ACK","authors":"M. Inamullah, B. Raman","doi":"10.1145/3264877.3264879","DOIUrl":"https://doi.org/10.1145/3264877.3264879","url":null,"abstract":"Frame aggregation in 802.11n and ac gives higher throughputs because larger aggregates reduce inter-frame timing overheads. When aggregate (A-MPDU) sizes are forced to be smaller the throughput benefit dwindles. During normal operation the A-MPDU sizes fall from the maximum possible due to the loss of individual constituent subframes. In the worst case, the size can be as low as a single subframe. We show that, compared to the worst case, full-sized A-MPDUs can give up to 400% higher throughput for the highest MCS indexes of 802.11ac. In this paper, we explain how fixed block ACK size coupled with subframe retransmission are the main causes of reduction in A-MPDU size. We present the modification in the block ACK mechanism needed to attain larger sizes of aggregates even in the presence of subframe losses.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"17 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75527375","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2018-10-01DOI: 10.1145/3264877.3264878
Ge Wang, Chen Qian, Haofan Cai, Jinsong Han, Jizhong Zhao
{"title":"Replay-resilient Authentication for IoT","authors":"Ge Wang, Chen Qian, Haofan Cai, Jinsong Han, Jizhong Zhao","doi":"10.1145/3264877.3264878","DOIUrl":"https://doi.org/10.1145/3264877.3264878","url":null,"abstract":"We provide the first solution to an important question, \"how a physical-layer RFID authentication method can defend against signal replay attacks\". It was believed that if the attacker has a device that can replay the exact same reply signal of a legitimate tag, any physical-layer authentication method will fail. This paper presents Hu-Fu, the first physical layer RFID authentication protocol that is resilient to the major attacks including tag counterfeiting, signal replay, signal compensation, and brute-force feature reply. Hu-Fu is built on two fundamental ideas, namely inductive coupling of two tags and signal randomization. Hu-Fu does not require any hardware or protocol modification on COTS passive tags and can be implemented with COTS devices. We implement a prototype of Hu-Fu and demonstrate that it is accurate and robust to device diversity and environmental changes.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2018-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88540165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2017-10-20DOI: 10.1145/3131348.3131352
Xinyi Li, Chao Feng, Nana Ding, Ju Wang, Jie Xiong, Yuhui Ren, Xiaojiang Chen, Dingyi Fang
{"title":"Target Material Identification with Commodity RFID Devices","authors":"Xinyi Li, Chao Feng, Nana Ding, Ju Wang, Jie Xiong, Yuhui Ren, Xiaojiang Chen, Dingyi Fang","doi":"10.1145/3131348.3131352","DOIUrl":"https://doi.org/10.1145/3131348.3131352","url":null,"abstract":"Target material identification plays an important role in many real-life applications. This paper introduces a system that can identify the material type with cheap commercial off-the-shelf (COTS) RFID devices. The key intuition is that different materials cause different amounts of phase and RSS (Received Signal Strength) changes when radio frequency (RF) signal penetrates through the target. However, without knowing either material type, trying to obtain the information is challenging. We propose a method to address this challenge and evaluate the method's performance in real-world environment. The results show that we achieve higher than 94% material identification accuracies for 10 liquids and differentiate even very similar objects such as Coke and Pepsi.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"38 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86262549","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
世界中学生文摘Pub Date : 2017-10-20DOI: 10.1145/3131348.3131358
Hoang Truong, Phuc Nguyen, Nam Bui, Anh Nguyen, Tam N. Vu
{"title":"Demo: Low-power Capacitive Sensing Wristband for Hand Gesture Recognition","authors":"Hoang Truong, Phuc Nguyen, Nam Bui, Anh Nguyen, Tam N. Vu","doi":"10.1145/3131348.3131358","DOIUrl":"https://doi.org/10.1145/3131348.3131358","url":null,"abstract":"Along with the rapid development of human-computer interaction (HCI), controlling objects and smart devices remotely from afar has become the trend to satisfy the needs of consumers. Hand gesture recognition is among the methods that highly attract the attention in this field yet there still exists many aspect to explore and improve. We propose a low-cost low-power wristband-form hand gesture recognition system utilizing capacitive sensing technique. We provide an open source system which includes low-power, low-cost hardware components and user-friendly software stack. This system will be available for users and developers to customize various hand gesture set and integrate into third part application, from computer remote command to video game controller.","PeriodicalId":62224,"journal":{"name":"世界中学生文摘","volume":"121 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2017-10-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78422655","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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