Tadashi Okoshi

Tadashi Okoshi
Keio University | Keidai · Graduate School of Media and Governance

Ph.D.

About

80
Publications
9,816
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Introduction
Tadashi Okoshi is a Project Associate Professor of Graduate School of Media and Governance. He is a computer scientist especially focusing on distributed systems, mobile and ubiquitous computing, context-aware computing etc. His current research topic is "Human Attention Management" and "Computing for Well-being" (WellComp). He holds B.A. in Environmental Information (1998), Master of Media and Governance (2000) from Keio University, M.S. in Computer Science (2006) from Carnegie Mellon University, and Ph.D. in Media and Governance (2015) from Keio University, respectively. He also has over 7 year experiences of entrepreneurship, software architecting, product management, and project management in IT industries (Web2.0, blogging, social networking and social media).

Publications

Publications (80)
Article
Full-text available
Happiness is obviously one of the most fundamental essence that affects many aspects of our lives. Past research found that happiness of one person affects that of other people. What occurs under this propagation of emotion is called “emotional contagion,” a phenomenon wherein through perception, people experience the same emotion expressed by some...
Preprint
The ability to estimate the current affective statuses of web users has considerable potential for the realization of user-centric services in the society. However, in real-world web services, it is difficult to determine the type of data to be used for such estimation, as well as collecting the ground truths of such affective statuses. We propose...
Article
Full-text available
Attempts to facilitate and streamline systems architecting have resulted in a great number of reusable principles, practices, mechanisms, frameworks, and tools. Such a practice is the use of architectural viewpoints and views. However, as systems change, these practices should also evolve. The increasing scale and complexity of systems resulting fr...
Conference Paper
SOXFire is the IoT platform based on pub/sub-model. This platform can provide easy methods for treating sensors because it has a feature by extended XMPP. In addition, this platform is implemented by XMPP, so this platform can spread data for many clients. We focused on this platform; we thought the extend the system to realize an open-data marketp...
Preprint
Owing to the pandemic caused by the coronavirus disease of 2019 (COVID-19), several universities have closed their campuses for preventing the spread of infection. Consequently, the university classes are being held over the Internet, and students attend these classes from their homes. While the COVID-19 pandemic is expected to be prolonged, the on...
Preprint
The ability to estimate current affective statuses of web users has considerable potential towards the realization of user-centric opportune services. However, determining the type of data to be used for such estimation as well as collecting the ground truth of such affective statuses are difficult in the real world situation. We propose a novel wa...
Chapter
The latest smartphones have advanced sensors that allow us to recognize human and environmental contexts. They operate primarily on Android and iOS, and can be used as sensing platforms for research in various fields owing to their ubiquity in society. Mobile sensing frameworks help to manage these sensors easily. However, Android and iOS are const...
Conference Paper
Full-text available
With the advent of 24/7 technology-driven society, there are rising discomforts and increasing concerns over sleep. Quality of sleep critically affects human well-being and everyday performance. A good night's sleep, therefore, is essential to prepare one's mind and body for the next day. In this paper, we propose SleepThermo, a system that identif...
Conference Paper
Full-text available
Users are increasingly being confronted with a tremendous amount of information proactively provided via notifications from versatile applications and services, through multiple devices and screens in their environment ubiquitously. However, human attention is limited. Further, the latest computing trends including versatile IoT devices, and contex...
Conference Paper
With the advancements in ubiquitous computing, ubicomp technology has deeply spread into our daily lives, including office work, home and house-keeping, health management, transportation, or even urban living environments. Furthermore, beyond the initial metric of computing, such as "efficiency" and "productivity", the benefits that people (users)...
Conference Paper
Full-text available
The limited attentional resource of users is a bottleneck to delivery of push notifications in today's mobile and ubiquitous computing environments. Adaptive mobile notification scheduling, which detects opportune timings based on mobile sensing and machine learning, has been proposed as a way of alleviating this problem. However, it is still not c...
Conference Paper
Full-text available
Conversational agents are increasingly becoming digital partners of our everyday computing experiences offering a variety of purposeful information and utility services. Although rich on competency, these agents are entirely oblivious to their users' situational and emotional context today and incapable of adjusting their interaction style and tone...
Conference Paper
Full-text available
In correlation with the socio-economic development, changes in people's lifestyle brought about significant impact on dietary patterns. Though public concerns over healthy eating are increasing, many are still uncertain when choosing a well balanced meal amid welter of information. In this paper, we propose "KomaFLens'', a mobile system and applica...
Article
We present the results of our experiment aimed to comprehensively understand the combination of 1) how smartphone users interact with their notifications, 2) what notification content is considered important, 3) the complex relationship between the interaction choices and content importance, and lastly 4) establish an intelligent method to predict...
Conference Paper
Today, many users of mobile devices are continuously confronted with a huge variety of information: notifications from Facebook, new application updates, won badges, or reminders. This leads to an information overload, which makes it hard to stay focused. This workshop will investigate approaches towards smart attention management systems. We will...
Conference Paper
Full-text available
In this research, we propose a system that allows one to find a hidden spot that is scenic, yet unpopulated, with the intention of improving the satisfaction of one's trip. These hidden spots are not yet noted in the existing tourism services, however can provide a new place for the tourists to discover. We developed an application as a prototype t...
Conference Paper
Full-text available
With the advancements in ubiquitous computing, ubicomp technology has deeply spread into our daily lives, including office work, home and house-keeping, health management, transportation, or even urban living environments. Furthermore, beyond the initial metric of computing, such as "efficiency" and "productivity", the benefits that people (users)...
Conference Paper
Full-text available
Towards wellbeing-awareness in computing, researches for estimating users' emotions using smartphone sensor data have been actively conducted as smartphones are getting more and more ubiquitous. Most studies have constructed emotion estimation models based on machine learning with contextual data from the smartphones and user's self-reporting groun...
Conference Paper
Full-text available
We propose a Meal Photo SNS (called HealthyStadium) for improving users' eating habits by mutually assessing each others' health. This application's method is to evaluates pictures of meals leads to the realization of sustainable journaling. In addition, we implement competitive awareness that motivates the users to improve their eating habits by a...
Conference Paper
By enabling driver mode on a smartphone, the smartphone can autonomously detect driving activities and suppress any incoming notifications so that drivers can focus on their attention on driving activities. However, the current driving mode implementations are limited in the fact that they frequently misjudge driving activities and also only have t...
Conference Paper
Full-text available
In the advancing ubiquitous computing, users are increasingly confronted with a tremendous amount of information proactively provided via notifications from versatile applications and services, through multiple devices and screens in their environment. The human's attention is becoming a new significant bottleneck. Further, the latest computing tre...
Article
Human attention has bottlenecked today's ubiquitous computing environment where users are consuming increasing amounts of information from numerous applications and services. Since the system-to-user provision of information is becoming more proactive, mainly via push notifications that often cause interruption at the users’ side, attention managem...
Conference Paper
Full-text available
In a world moving towards ubiquitous computing, users are increasingly confronted with a tremendous amount of information proactively provided via notifications. Today, notifications are generated by a large number of applications and services, through multiple devices and screens in the users' environment. Thus, human's attention became a signific...
Conference Paper
Full-text available
In the advancing ubiquitous computing where users have been having an increasing amount of push-style information provision from lots of intelligent proactive services, detecting the users' current attentional status and/or interruptibility has been a significant issue. In our previous study[7] on interruptibility detection in "Yahoo! JAPAN" real w...
Conference Paper
Full-text available
We propose "SmileWave", the first selfie social networking service to reveal the existence of emotional cognation through smiling selfies on the social network. We conducted multiple rounds of in-the-wild user studies with 86 cumulative total users for total duration of 5 weeks. Throughout the entire study, we confirmed the occurrence of smile-base...
Conference Paper
Full-text available
In today's advancing ubiquitous computing age, with its ever-increasing amount of information from various applications and services available for consumption, the management of people's attention has become very important. In particular, the high volume of notifications on mobile devices has become a major cause of interruption of users. There has...
Conference Paper
Full-text available
Have you ever talked to fish? If you can incorporate the feelings of your fish into breeding systems, life with your fish can become more comfortable, fun, and a greater experience overall. In breeding pets, owners often cannot properly understand their pet's internal state, which can lead to impaired health-or worse, loss of life-for the pet. In c...
Article
Full-text available
Evacuation trainings have been conducted as an effective action to protect people from incoming tsunamis in case of a big earthquake. This research addresses limitations of existing conventional "event-style" tsunami evacuation trainings, that are inflexibility in disaster scenarios, training timings, training locations, and participatable trainees...
Conference Paper
Full-text available
Users of digital devices are increasingly confronted with a tremendous amount of notifications that appear on multiple devices and screens in their environment. Today many users own different ubiquitous devices such as a smart-phone, a tablet, a notebook and a smartwatch. If an email client is installed on every device an incoming email produces up...
Conference Paper
Full-text available
We propose a system for improving the answer rate to ESM inquiry to reduce the user's mental burden by detecting breakpoints in user's physical activity and pushing notifications in such timings. We conducted an in-the-wild user study with 30 participants for 4-days. The results revealed the effectiveness of breakpoint-based notification delivery....
Conference Paper
Full-text available
As users enjoy their computing with an increasing number of devices, applications and services, and connected other users, users' attention is getting the most precious resource in computing due to increasing information fragments provided proactively. Research on user's attention management and especially interruptibility have been accelerated in...
Conference Paper
Mobile phones allow us to reach people anywhere, anytime. In addition to the benefits for end users, researchers and developers can also benefit from the powerful devices that people carry on a daily basis. Collectively, mobile phones form a ubiquitous computer. The Ubiquitous Mobile Instrumentation (UbiMI) workshop focuses on using mobile devices...
Conference Paper
Full-text available
Today, many users of mobile devices are continuously confronted with a huge variety of information: notifications from Facebook, new application updates, won badges, or reminders. This leads to an information overload, which makes it hard to stay focused. This workshop will investigate approaches towards smart attention management systems. We will...
Conference Paper
Inertial Measurement Units (IMUs) embedded in commercial mobile devices are a good choice for continuous monitoring in healthcare domain due to their attractive form factor and low power consumption. We present improved and accurate sensing algorithms to sense basic events like step count, stride length, fall, and calorie, with accuracies better th...
Article
Full-text available
As the amount of information to users increases with the trends of an increasing numbers of devices, applications, and web services, the new bottleneck in computing is human attention. To minimize users attentional overload, we propose a novel middleware “Attelia” that detects breakpoints of user’s mobile interactions to deliver notifications adapt...
Article
Recent technological trends in mobile/wearable devices and sensors have been enabling an increasing number of people to collect and store their "lifelog" easily in their daily lives. Beyond exercise behavior change of individual users, our research focus is on the behavior change of teams, based on life-logging technologies and lifelog sharing. In...
Conference Paper
Full-text available
We present Senbay, a novel smartphone-based platform for capturing and sharing synchronously-recorded video/sensor data stream using animated two-dimensional barcode. In the ubicomp environment, mobile devices have enabled us to capture video and various types of sensor data easily. However, currently we do not have a framework to instantly integra...
Conference Paper
Full-text available
In today's ubiquitous computing environment where users carry, manipulate, and interact with an increasing number of networked devices, applications and web services, human attention is the new bottleneck in computing. It is therefore important to minimize a user's mental effort due to notifications, especially in situations where users are mobile...
Conference Paper
Full-text available
In today's ubiquitous computing environment where the number of devices, applications and web services are ever increasing, human attention is the new bottleneck in computing. To minimize user cognitive load, we propose Attelia, a novel middleware that identifies breakpoints in user interaction and delivers notifications at these moments. Attelia w...
Conference Paper
Full-text available
We present QueueVadis, a system that addresses the problem of estimating, in real-time, the properties of queues at commonplace urban locations, such as coffee shops, taxi stands and movie theaters. Abjuring the use of any queuing-specific infrastructure sensors, QueueVadis uses participatory mobile sensing to detect both (i) the individual-level q...
Article
Recent technological trends on mobile/wearable devices and sensors have been enabling increasing number of people to collect and store their 'life-logs' easily in their daily lives. Beyond exercise behavior change of individual user, our research focus is on the behavior change of teams, based on life-logging technologies and information sharing. I...
Article
Full-text available
In progressing ubiquitous computing where number of devices, applications and the web services are everincreasing, human user's attention is a new bottleneck in computing. This paper proposes Attelia, a novel middleware that senses user's attention status on user'ssmart phones in real-time, without any dedicated psycho-physiological sensors. To fin...
Conference Paper
This paper proposes a novel “Application as a Sensor” (AaaS) approach for user attention status sensing in mobile and ubiquitous computing where user attends to ubicomp-related goal-directed tasks that usually involve in “applications”. By using information in the application layer including application-specific knowledge on user's attention status...
Conference Paper
LiveLabs is an urban scale research testbed in Singapore. It is currently in the process of design, implementation and deployment at real-life urban spaces like a sprawling university campus, a shopping mall, an airport and an amusement park; where real smartphone users are being incentivized to participate in large scale consumer behavioral trials...
Article
In this demo, we present Focus , a system for effectively and efficiently reducing the power consumption of OLED displays. The key idea of Focus is that we can save display power by dimming the portions of the applications and games that are less important to the user using the notion of saliency. We explain the design considerations driving Focus...
Article
Full-text available
In this paper, we present the design and implementation of Focus, a system for effectively and efficiently reducing power consumption of OLED displays on smartphones. These displays, while becoming exceedingly common still consume significant power. The key idea of Focus is that we use the notion of saliency to save display power by dimming portion...
Conference Paper
Full-text available
Remote execution can transform the puniest mobile device into a computing giant able to run resource-intensive applications such as natural language translation, speech recognition, face recognition, and augmented reality. However, easily partitioning these applications for remote execution while retaining application-specific information has prove...
Article
Full-text available
With the prevalance of handheld devices, it is increasingly necessary to build systems that adapt applications according to the available resources. These systems offer new and constantly changing interfaces for adaptation. Integrating applications with these systems requires extensive modification and maintainence: this is painful! In this paper,...
Article
Full-text available
In this paper, we present a new mobility-support model for applications, Application Module Request Broker (AMRB). We focus on two types of mobility: host mobility and application code mobility. These two types of mobility dynamically change the binding between applications' name and location in the network. AMRB conceals these changes of binding t...