by Jinyoung Choi on 2016-04-13 00:00:00

Date : 2016. 05. 04. (Wed) 11:00 A.M. Locate : EB5. 533 Presenter : Jinyoung Choi   Title : Trajectories of Depression: Unobtrusive Monitoring of Depressive States by means of Smartphone Mobility Traces Analysis Author : Luca Canzian, Mirco Musolesi   Abstract :  One of the most interesting applications of mobile sensing is monitoring of individual behavior, especially in the area of mental health care. Most existing systems require an interaction with the device, for example they may require the user to input his/her mood state at regular intervals. In this paper we seek to answer whether mobile phones can be used to unobtrusively monitor individuals affected by depressive mood disorders by analyzing only their mobility patterns from GPS traces. In order to get ground-truth measurements, we have developed a smartphone application that periodically collects the locations of the users and the answers to daily questionnaires that ... Continue reading →


RIOT OS: Towards an OS for the Internet of Things

by Sungyup Lee on 2016-04-12 17:43:42

Date : 2016. 04. 13(Wed) 2:00 P.M. Locate : EB5. 533 Presenter : Sungyup Lee   Title : RIOT OS: Towards an OS for the Internet of Things Author : Emmanuel Baccelli and Oliver Hahm, Mesut Gunes and Matthias Wahlisch Freie , Thomas C. Schmidt   Abstract : The Internet of Things (IoT) is characterized by heterogeneous devices. They range from very lightweight sensors powered by 8-bit microcontrollers (MCUs) to devices equipped with more powerful, but energy-efficient 32-bit processors. Neither a traditional operating system (OS) currently running on Internet hosts, nor typical OS for sensor networks are capable to fulfill the diverse requirements of such a wide range of devices. To leverage the IoT, redundant development should be avoided and maintenance costs should be reduced. In this paper we revisit the requirements for an OS in the IoT. We introduce RIOT OS, an OS that explicitly considers devices with minimal resources but ... Continue reading →


Ravel: Programming IoT Applications as Distributed Models, Views, and Controllers

by Ikhee Shin on 2016-04-04 13:38:14

Date : 2016. 04. 06(Wed) 11:00 A.M. Locate : EB5. 533 Presenter : Ikhee Shin   Title : Ravel: Programming IoT Applications as Distributed Models, Views, and Controllers Author : Laurynas Riliskis, James Hong & Philip Levis   Abstract : The embedded sensor networks are a promising technology to improve our life with home and industrial automation, health monitoring, and sensing and actuation in agriculture. Fitness trackers, thermostats, door locks are just a few examples of Internet of Things that have already become part of our everyday life. Despite advances in sensors, microcontrollers, signal processing, networking and programming languages, developing an Internet of Things application is a laborious task. Many of these complex distributed systems share a 3-tier architecture consisting of embedded nodes, gateways that connect an embedded network to the wider Internet and data services in servers or the cloud. Yet the ... Continue reading →


Spatial Computing

by Seula Hwang on 2016-03-18 17:54:56

Date : 2016. 03. 30(Wed) 11:00 A.M. Locate : EB5. 533 Presenter : Seula Hwang   Title : Spatial Computing Author : Shashi Shekhar, Steven K. Feiner, Walid G. Aref   Abstract : Spatial computing encompasses the ideas, solutions, tools, technologies, and systems that transform our lives by creating a new understanding of locations—how we know, communicate, and visualize our relationship to locations and how we navigate through them. Pervasive GPS allows hikers in national parks, boaters on lakes, children visiting new places, and taxis (or Uber drivers or self-driving cars) and unmanned aerial vehicles to know their locations, nearby facilities, and routes to reach places of interest.   Proceeding : Communications Communications of the ACM, Vol. 59 No. 1, Pages 72-81 10.1145/2756547 Continue reading →


Monitoring Building Door Events using Barometer Sensor in Smartphones

by Jinse Kwon on 2016-03-04 16:28:02

Date : 2016. 03. 09 (Wed) 11:00 A.M. Locate : EB5. 533 Presenter : Jinse Kwon   Title : Monitoring Building Door Events using Barometer Sensor in Smartphones Author : Muchen Wu, Parth H. Pathak, Prasant Mohapatra   Abstract : Building security systems are commonly deployed to detect intrusion and burglary in home and business structures. Such systems can accurately detect door open/close events, but their high-cost of installation and maintenance makes them unsuitable for certain building monitoring applications, such as times of high/low entrance traffic, estimating building occupancy, etc. In this paper, we show that barometer sensors found in latest smartphones can directly detect the building door open/close events anywhere inside an insulated building. The sudden pressure change observed by barometers is sufficient to detect events even in presence of user mobility (e.g. climbing stairs). We study various characteristics of ... Continue reading →


WearDrive: Fast and Energy-Efficient Storage for Wearables

by Jemin Lee on 2016-02-18 17:05:11

Date : 2016. 02. 29. (Mon.) 03:00 P.M. Locate : EB5. 533 Presenter : Jemin Lee   Title: WearDrive: Fast and Energy-Efficient Storage for Wearables Author: Huang J, Badam A, Chandra R, Nightingale EB   Abstract Size and weight constraints on wearables limit their battery capacity and restrict them from providing rich functionality. The need for durable and secure storage for personal data further compounds this problem as these features incur energy-intensive operations. This paper presents WearDrive, a fast storage system for wearables based on battery-backed RAM and an efficient means to offload energy intensive tasks to the phone. WearDrive leverages low-power network connectivity available on wearables to trade the phone’s battery for the wearable’s by performing large and energy-intensive tasks on the phone while performing small and energy-efficient tasks locally using battery-backed RAM. WearDrive improves the performance of ... Continue reading →


전달세미나 : 2016 PRML winter school

by Jinse Kwon on 2016-02-12 11:15:12

Date : 2016. 02. 15 (Mon) 3:00 P.M. Locate : EB5. 533 Presenter : Jinse Kwon Seminar Title : Reviews for 2016 Pattern Recognition and Machine Learning winter school Continue reading →


Heart rate variability & 전달세미나: HCI Korea 2016

by Jinyoung Choi on 2016-01-21 18:00:13

Date : 2016. 02. 01 (Mon) 3:00 P.M. Locate : EB5. 533 Presenter : Jinyoung Choi   Title : Heart rate variablity & 전달세미나: HCI Korea 2016 Author : Marek Malik, J. Thomas Bigger, A. John Camm, Robert E. Kleiger, Alberto Malliani, Arthur J. Moss, Peter J. Schwartz   Abstract   The last two decades have witnessed the recognition of a significant relationship between the autonomic nervous system and cardiovascular mortality, including sudden cardiac death. Experimental evidence for an association between a propensity for lethal arrhythmias and signs of either increased sympathetic or reduced vagal activity has encouraged the development of quantitative markers of autonomic activity. Heart rate variability (HRV) represents one of the most promising such markers. The apparently easy derivation of this measure has opularized its use. ... Continue reading →


전달 세미나: 2016 CES and ICCE, KSCI

by Jinyoung Choi on 2016-01-16 19:26:11

Date : 2016. 01. 18 (Mon) 3:00 P.M. Locate : EB5. 533 Presenter : Jemin Lee, Jinyoung Choi Seminar Title : Reviews for 2016 CES and ICCE, KSCI 2016   Continue reading →


MarketNet: An Asymmetric Transmission Power-based Wireless System for ...

by Wonjun Hwang on 2015-12-10 15:33:32

Date : 2015. 12. 10 (Mon) 10:00 A.M. Locate : EB5. 533 Presenter : Wonjun Hwang   Title : MarketNet: An Asymmetric Transmission Power-based Wireless System for Managing e-Price Tags in Markets Author : Hyung-Sin Kim, Hosoo Cho, Myung-Sup Lee, Jeongyeup Paek, JeongGil Ko, Saewoong Bahk Seoul National University, Chung-Ang University, Ajou Univerisity   Abstract Updating price tags in a large-scale market is a recurrent task, still performed manually in most markets. Given that human-errors can easily lead to customer complaints and accounting inaccuracies, the ability to autonomously reconfigure price tags can be of significant benefit. With the introduction of low-power display techniques such as electronic ink, applications of enabling electronic, wirelessly reconfigurable price tags show potential for future deployment. In this work, we examine networking architectures that can be applied in such scenarios. ... Continue reading →


ALPS: A Bluetooth and Ultrasound Platform for Mapping and Localization

by Jinse Kwon on 2015-12-03 11:56:42

Date : 2015. 12. 03 (Mon) 10:00 A.M. Locate : EB5. 533 Presenter : Jinse Kwon   Title : ALPS: A Bluetooth and Ultrasound Platform for Mapping and Localization Author : Patrick Lazik, Niranjini Rajagopal, Oliver Shih, Bruno Sinopoli, Anthony Rowe Carnegie Mellon University   Abstract   The proliferation of Bluetooth Low-Energy (BLE) chipsets on mobile devices has lead to a wide variety of userinstallable tags and beacons designed for location-aware applications. In this paper, we present the Acoustic Location Processing System (ALPS), a platform that augments BLE transmitters with ultrasound in a manner that improves ranging accuracy and can help users configure indoor localization systems with minimal effort. A user places three or more beacons in an environment and then walks through a calibration sequence with their mobile device where they touch key points in the environment ... Continue reading →


Designing Content-driven Intelligent Notification Mechanisms for Mobile Applications

by Jemin Lee on 2015-11-26 21:21:36

Date : 2015. 11. 30. (Mon.) 10:00 A.M. Locate : EB5. 533 Presenter : Jemin Lee   Title: Designing Content-driven Intelligent Notification Mechanisms for Mobile Applications Author: Abhinav Mehrotra, Mirco Musolesi, Robert Hendley, Veljko Pejovic Abstract An increasing number of notifications demanding the smartphone user's attention, often arrive at an inappropriate moment, or carry irrelevant content. In this paper we present a study of mobile user interruptibility with respect to notification content, its sender, and the context in which a notification is received. In a real-world study we collect around 70,000 instances of notifications from 35 users. We group notifications according to the applications that initiated them, and the social relationship between the sender and the receiver. Then, by considering both content and context information, such as the current activity of a user, we discuss the design of classifiers for learning ... Continue reading →


InterruptMe: Designing Intelligent Prompting Mechanisms for Pervasive Applications

by Jinyoung Choi on 2015-11-16 16:07:36

Date : 2015. 11. 23. (Mon) 10:00 A.M. Locate : EB5. 533 Presenter : Jinyoung Choi   Title : InterruptMe: Designing Intelligent Prompting Mechanisms for Pervasive Applications Author : Veljko Pejovic  University of Birmingham, United Kingdom   Abstract   The mobile phone represents a unique platform for interactive applications that can harness the opportunity of an immediate contact with a user in order to increase the impact of the delivered information. However, this accessibility does not necessarily translate to reachability, as recipients might refuse an initiated contact or disfavor a message that comes in an inappropriate moment. In this paper we seek to answer whether, and how, suitable moments for interruption can be identified and utilized in a mobile system. We gather and analyze a real-world smartphone data trace and show that users’ broader context, including their activity, location, time of day, emotions and ... Continue reading →


Non-obstructive Room-level Locating System in Home Environments ...

by Jinse Kwon on 2015-10-12 07:00:40

Date : 2015. 10. 12 (Mon) 10:00 A.M. Locate : EB5. 533 Presenter : Jinse Kwon   Title : Non-obstructive Room-level Locating System in Home Environments using Activity Fingerprints from Smartwatch Author : Lee Seungwoo   Abstract   Many smart home applications, such as monitoring for the elderly and home automation, require location information for individual occupants. Several techniques have been proposed for tracking occupants in a home environment. However, the current techniques do not provide a seamless in-home locating system owing to the occupants’ devicefree movement and the lack of cost-effective infrastructure for home location tracking. In this paper, we propose a home occupant tracking system that uses a smartphone and an off-the-shelf smartwatch without additional infrastructure. In our system, activity fingerprints are automatically generated from the microphone and the inertial sensors of the smartwatch, and ... Continue reading →


Step-by-Step Detection of Personally Collocated Mobile Devices

by Jemin Lee on 2015-08-27 15:59:36

Date : 2015. 08. 28. (Friday) 10:30 A.M. Locate : EB5. 533 Presenter : Jemin Lee  Title : Step-by-Step Detection of Personally Collocated Mobile Devices   Author : A. Srivastava, J. Gummeson, M. Baker, and K.-H. Kim Abstract Many people now carry multiple mobile devices on a daily basis. Wearables, smartphones, tablets, and laptops all have their different advantages, but collectively they can increase a user’s device management burden. Management problems include leaving a device behind accidentally, receiving notifications on the wrong device, and failing to secure all of the devices as needed. Reducing this burden requires detecting which of a user’s devices are “personally collocated” – those devices he currently wears, carries, or has under his immediate physical control. We present a lightweight method to detect personal collocation by comparing accelerometer-based footstep ... Continue reading →