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Kaori Fujinami received his B.S. and M.S. in electrical engineering and his Ph.D. in computer science from Waseda University, Japan, in 1993, 1995, and 2005, respectively. From 2005 to 2006, he was a visiting lecturer at Waseda University. From 2007 to 2017, he was an associate professor at the Department of Computer and Information Sciences at TUAT. In 2018, he became a professor at TUAT. His research interests are machine learning, activity recognition, human–computer interaction, and ubiquitous computing.
On-body device position awareness plays an important role in providing smartphone-based services with high levels of usability and quality. Traditionally, the problem assumed that the positions that were supported by the system were fixed at the time of design. Thus, if a user stores his/her terminal into an unsupported position, the system forcibly classifies it into one of the supported positions. In contrast, we propose a framework to discover new positions that are not initially supported by the system, which adds them as recognition targets via labeling by a user and re-training on-the-fly. In this article, we focus on a component of identifying a set of samples that are derived from a single storing position, which we call new position candidate identification. Clustering is applied as a key component to prepare a reliable dataset for re-training and to reduce the user’s burden of labeling. Specifically, density-based spatial clustering of applications with noise (DBSCAN) is employed because it does not require the number of clusters in advance. We propose a method of finding an optimal value of a main parameter, Eps-neighborhood (eps), which affects the accuracy of the resultant clusters. Simulation-based experiments show that the proposed method performs as if the number of new positions were known in advance. Furthermore, we clarify the timing of performing the new position candidate identification process, in which we propose criteria for qualifying a cluster as the one comprising a new position.
Mitsuaki Saito; Kaori Fujinami. New Position Candidate Identification via Clustering toward an Extensible On-Body Smartphone Localization System. Sensors 2021, 21, 1276 .
AMA StyleMitsuaki Saito, Kaori Fujinami. New Position Candidate Identification via Clustering toward an Extensible On-Body Smartphone Localization System. Sensors. 2021; 21 (4):1276.
Chicago/Turabian StyleMitsuaki Saito; Kaori Fujinami. 2021. "New Position Candidate Identification via Clustering toward an Extensible On-Body Smartphone Localization System." Sensors 21, no. 4: 1276.
Augmented Reality (AR) is a class of “mediated reality” that artificially modifies the human perception by superimposing virtual objects on the real world, which is expected to supplement reality. In visual-based augmentation, text and graphics, i.e., label, are often associated with a physical object or a place to describe it. View management in AR is to maintain the visibility of the associated information and plays an important role on communicating the information. Various view management techniques have been investigated so far; however, most of them have been designed for two dimensional see-through displays, and few have been investigated for projector-based AR called spatial AR. In this article, we propose a view management method for spatial AR, VisLP, that places labels and linkage lines based on the estimation of the visibility. Since the information is directly projected on objects, the nature of optics such as reflection and refraction constrains the visibility in addition to the spatial relationship between the information, the objects, and the user. VisLP employs machine-learning techniques to estimate the visibility that reflects human’s subjective mental workload in reading information and objective measures of reading correctness in various projection conditions. Four classes are defined for a label, while the visibility of a linkage line has three classes. After 88 and 28 classification features for label and linkage line visibility estimators are designed, respectively, subsets of features with 15 and 14 features are chosen to improve the processing speed of feature calculation up to 170%, with slight degradation of classification performance. An online experiment with new users and objects showed that 76.0% of the system’s judgments were matched with the users’ evaluations, while 73% of the linkage line visibility estimations were matched.
Keita Ichihashi; Kaori Fujinami. Estimating Visibility of Annotations for View Management in Spatial Augmented Reality Based on Machine-Learning Techniques. Sensors 2019, 19, 939 .
AMA StyleKeita Ichihashi, Kaori Fujinami. Estimating Visibility of Annotations for View Management in Spatial Augmented Reality Based on Machine-Learning Techniques. Sensors. 2019; 19 (4):939.
Chicago/Turabian StyleKeita Ichihashi; Kaori Fujinami. 2019. "Estimating Visibility of Annotations for View Management in Spatial Augmented Reality Based on Machine-Learning Techniques." Sensors 19, no. 4: 939.
Yuki Tanida; Kaori Fujinami. Visible Position Estimation in Whole Wrist Circumference Device towards Forearm Pose-aware Display. EAI Endorsed Transactions on Context-aware Systems and Applications 2018, 4, 1 .
AMA StyleYuki Tanida, Kaori Fujinami. Visible Position Estimation in Whole Wrist Circumference Device towards Forearm Pose-aware Display. EAI Endorsed Transactions on Context-aware Systems and Applications. 2018; 4 (13):1.
Chicago/Turabian StyleYuki Tanida; Kaori Fujinami. 2018. "Visible Position Estimation in Whole Wrist Circumference Device towards Forearm Pose-aware Display." EAI Endorsed Transactions on Context-aware Systems and Applications 4, no. 13: 1.
Social network services (SNSs) allow users to share their daily experiences and significant life events with family, friends, and colleagues. However, excessive use of SNSs or dependence upon them can cause a problem known as “SNS fatigue” that is associated with feelings of anxiety and loneliness. In other words, the tighter and stronger the social bonds are through SNSs, the more users feel anxiety and loneliness. We propose a method for providing users with a sense of security and connectedness with others by facilitating loose communication. Loose communication is defined by the presentation of abstract information and passive (one-way) communication. By focusing on the physicality and anthropomorphic characteristics of tangible avatars, we investigated a communication support system, Palco, that displays three types of contextual information with respect to the communication partner—emotional state, activity, and location—in a loose manner. Our approach contrasts with typical SNS interaction methods characterized by tight communication with interactivity and concrete information. This paper describes the design and implementation of Palco, as well as its usefulness as a communication tool. The emotional effects on the users are evaluated through a user study with 10 participants over four days. The results imply that Palco can effectively communicate the context of the communication partner, and provide a sense of security.
Shinichi Endo; Kaori Fujinami. Realizing Loose Communication with Tangible Avatar to Facilitate Recipient’s Imagination. Information 2018, 9, 32 .
AMA StyleShinichi Endo, Kaori Fujinami. Realizing Loose Communication with Tangible Avatar to Facilitate Recipient’s Imagination. Information. 2018; 9 (2):32.
Chicago/Turabian StyleShinichi Endo; Kaori Fujinami. 2018. "Realizing Loose Communication with Tangible Avatar to Facilitate Recipient’s Imagination." Information 9, no. 2: 32.
Kimie Suzuki; Kaori Fujinami. A Projector-Camera System for Ironing Support with Wrinkle Enhancement. ICST Transactions on Ambient Systems 2017, 4, 1 .
AMA StyleKimie Suzuki, Kaori Fujinami. A Projector-Camera System for Ironing Support with Wrinkle Enhancement. ICST Transactions on Ambient Systems. 2017; 4 (14):1.
Chicago/Turabian StyleKimie Suzuki; Kaori Fujinami. 2017. "A Projector-Camera System for Ironing Support with Wrinkle Enhancement." ICST Transactions on Ambient Systems 4, no. 14: 1.
Nozomu Tanaka; Kaori Fujinami. A Projector-Camera System for Augmented Card Playing and a Case Study with the Pelmanism Game. ICST Transactions on Ambient Systems 2017, 4, 152550 .
AMA StyleNozomu Tanaka, Kaori Fujinami. A Projector-Camera System for Augmented Card Playing and a Case Study with the Pelmanism Game. ICST Transactions on Ambient Systems. 2017; 4 (13):152550.
Chicago/Turabian StyleNozomu Tanaka; Kaori Fujinami. 2017. "A Projector-Camera System for Augmented Card Playing and a Case Study with the Pelmanism Game." ICST Transactions on Ambient Systems 4, no. 13: 152550.
SMARTPHONE-BASED ENVIRONMENTAL SENSING USING DEVICE LOCATION AS METADATA
Kaori Fujinami. SMARTPHONE-BASED ENVIRONMENTAL SENSING USING DEVICE LOCATION AS METADATA. International Journal on Smart Sensing and Intelligent Systems 2016, 9, 2257 -2275.
AMA StyleKaori Fujinami. SMARTPHONE-BASED ENVIRONMENTAL SENSING USING DEVICE LOCATION AS METADATA. International Journal on Smart Sensing and Intelligent Systems. 2016; 9 (4):2257-2275.
Chicago/Turabian StyleKaori Fujinami. 2016. "SMARTPHONE-BASED ENVIRONMENTAL SENSING USING DEVICE LOCATION AS METADATA." International Journal on Smart Sensing and Intelligent Systems 9, no. 4: 2257-2275.
UNSUPERVISED GROUPING OF MOVING OBJECTS BASED ON AGGLOMERATIVE HIERARCHICAL CLUSTERING
Kaori Fujinami. UNSUPERVISED GROUPING OF MOVING OBJECTS BASED ON AGGLOMERATIVE HIERARCHICAL CLUSTERING. International Journal on Smart Sensing and Intelligent Systems 2016, 9, 2276 -2296.
AMA StyleKaori Fujinami. UNSUPERVISED GROUPING OF MOVING OBJECTS BASED ON AGGLOMERATIVE HIERARCHICAL CLUSTERING. International Journal on Smart Sensing and Intelligent Systems. 2016; 9 (4):2276-2296.
Chicago/Turabian StyleKaori Fujinami. 2016. "UNSUPERVISED GROUPING OF MOVING OBJECTS BASED ON AGGLOMERATIVE HIERARCHICAL CLUSTERING." International Journal on Smart Sensing and Intelligent Systems 9, no. 4: 2276-2296.
Road anomalies, such as cracks, pits and puddles, have generally been identified by citizen reports made by e-mail or telephone; however, it is difficult for administrative entities to locate the anomaly for repair. An advanced smartphone-based solution that sends text and/or image reports with location information is not a long-lasting solution, because it depends on people’s active reporting. In this article, we show an opportunistic sensing-based system that uses a smartphone for road anomaly detection without any active user involvement. To detect road anomalies, we focus on pedestrians’ avoidance behaviors, which are characterized by changing azimuth patterns. Three typical avoidance behaviors are defined, and random forest is chosen as the classifier. Twenty-nine features are defined, in which features calculated by splitting a segment into the first half and the second half and considering the monotonicity of change were proven to be effective in recognition. Experiments were carried out under an ideal and controlled environment. Ten-fold cross-validation shows an average classification performance with an F-measure of 0.89 for six activities. The proposed recognition method was proven to be robust against the size of obstacles, and the dependency on the storing position of a smartphone can be handled by an appropriate classifier per storing position. Furthermore, an analysis implies that the classification of data from an “unknown” person can be improved by taking into account the compatibility of a classifier.
Tsuyoshi Ishikawa; Kaori Fujinami. Smartphone-Based Pedestrian’s Avoidance Behavior Recognition towards Opportunistic Road Anomaly Detection. ISPRS International Journal of Geo-Information 2016, 5, 182 .
AMA StyleTsuyoshi Ishikawa, Kaori Fujinami. Smartphone-Based Pedestrian’s Avoidance Behavior Recognition towards Opportunistic Road Anomaly Detection. ISPRS International Journal of Geo-Information. 2016; 5 (10):182.
Chicago/Turabian StyleTsuyoshi Ishikawa; Kaori Fujinami. 2016. "Smartphone-Based Pedestrian’s Avoidance Behavior Recognition towards Opportunistic Road Anomaly Detection." ISPRS International Journal of Geo-Information 5, no. 10: 182.
A user of a smartphone may feel convenient, happy, safe, etc., if his/her smartphone works smartly based on his/her context or the context of the device. In this article, we deal with the position of a smartphone on the body and carrying items like bags as the context of a device. The storing position of a smartphone impacts the performance of the notification to a user, as well as the measurement of embedded sensors, which plays an important role in a device’s functionality control, accurate activity recognition and reliable environmental sensing. In this article, nine storing positions, including four types of bags, are subject to recognition using an accelerometer on a smartphone. In total, 63 features are selected as a set of features among 182 systematically-defined features, which can characterize and discriminate the motion of a smartphone terminal during walking. As a result of leave-one-subject-out cross-validation, an accuracy of 0.801 for the nine-class classification is shown, while an accuracy of 0.859 is obtained against five classes, which merges the subclasses of trouser pockets and bags. We also show the basic performance evaluation to select the proper window size and classifier. Furthermore, the analysis of the contributive features is presented.
Kaori Fujinami. On-Body Smartphone Localization with an Accelerometer. Information 2016, 7, 21 .
AMA StyleKaori Fujinami. On-Body Smartphone Localization with an Accelerometer. Information. 2016; 7 (2):21.
Chicago/Turabian StyleKaori Fujinami. 2016. "On-Body Smartphone Localization with an Accelerometer." Information 7, no. 2: 21.
Augmented reality (AR) by a projector allows for the easy association of information by labeling the objects. When a projector is installed above a workspace and pointed downward, supportive information can be presented; however, the label will be deformed if the object is nonplanar. Also, a label might be projected in a region where it is hidden by the object, i.e., a blind area. In this paper, we propose a view management technique to allow interpretation by improving the legibility of the information. We propose the nonoverlapped gradient descent (NGD) method, which determines the position of a newly added label by avoiding overlap with the surrounding labels and linkage lines. The issues of presenting in a shadow or blind area are also addressed by estimating these areas based on the approximation of objects as a simple solid. The results of an experiment show that the visibility of the labels was improved by using this method.
Makoto Sato; Kaori Fujinami. Nonoverlapped view management for augmented reality by tabletop projection. Journal of Visual Languages & Computing 2014, 25, 891 -902.
AMA StyleMakoto Sato, Kaori Fujinami. Nonoverlapped view management for augmented reality by tabletop projection. Journal of Visual Languages & Computing. 2014; 25 (6):891-902.
Chicago/Turabian StyleMakoto Sato; Kaori Fujinami. 2014. "Nonoverlapped view management for augmented reality by tabletop projection." Journal of Visual Languages & Computing 25, no. 6: 891-902.
Satoshi Murata; Masanori Suzuki; Kaori Fujinami. A wearable projector-based gait assistance system and its application for elderly people. Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing 2013, 143 -152.
AMA StyleSatoshi Murata, Masanori Suzuki, Kaori Fujinami. A wearable projector-based gait assistance system and its application for elderly people. Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing. 2013; ():143-152.
Chicago/Turabian StyleSatoshi Murata; Masanori Suzuki; Kaori Fujinami. 2013. "A wearable projector-based gait assistance system and its application for elderly people." Proceedings of the 2013 ACM international joint conference on Pervasive and ubiquitous computing , no. : 143-152.
A mobile phone is getting smarter by employing a sensor and awareness of various contexts about a user and the terminal itself. In this paper, we deal with five storing positions of a smart phone on our body as a context: 1) front pocket of trousers, 2) back pocket of trousers, 3) jacket pocket (side), 4) chest pocket, and 5) around the neck (hanging). We propose a method for identifying the five positions with 29 features that characterize specific movements of a terminal at the position during walking. The result of offline experiment shows that an overall accuracy was 72.3% in a strict condition where datasets for a test were obtained from different people whose datasets were utilized for training a classifier. We also present a working prototype system with software framework for Android OS. An event of positional change is delivered to applications that conforms to APIs as well as to existing applications via preference settings. As a proof-of-concept application, a placement-aware heatstroke alerter was developed that tells a user about possible over (under) -estimate of the potential risk based on a storing position.
Kaori Fujinami; Satoshi Kouchi; Yuan Xue. Design and Implementation of an On-body Placement-Aware Smartphone. 2012 32nd International Conference on Distributed Computing Systems Workshops 2012, 69 -74.
AMA StyleKaori Fujinami, Satoshi Kouchi, Yuan Xue. Design and Implementation of an On-body Placement-Aware Smartphone. 2012 32nd International Conference on Distributed Computing Systems Workshops. 2012; ():69-74.
Chicago/Turabian StyleKaori Fujinami; Satoshi Kouchi; Yuan Xue. 2012. "Design and Implementation of an On-body Placement-Aware Smartphone." 2012 32nd International Conference on Distributed Computing Systems Workshops , no. : 69-74.
Kaori Fujinami; Akifumi Sokan. Nondirective information presentation for on-site safety training in chemistry experiments. Proceedings of the International Working Conference on Advanced Visual Interfaces 2012, 308 -311.
AMA StyleKaori Fujinami, Akifumi Sokan. Nondirective information presentation for on-site safety training in chemistry experiments. Proceedings of the International Working Conference on Advanced Visual Interfaces. 2012; ():308-311.
Chicago/Turabian StyleKaori Fujinami; Akifumi Sokan. 2012. "Nondirective information presentation for on-site safety training in chemistry experiments." Proceedings of the International Working Conference on Advanced Visual Interfaces , no. : 308-311.
We propose a tangible experiment support system that facilitates safe and independent chemistry experiments. For safe experiments, the system displays messages that alert a student to avoid a possible accident based on the operational context. Simultaneously, the system is designed to facilitate active thinking, in which the key concept is multiple interpretations of a message, to avoid dependency on the system in future experiments. The concept of an information presentation with three-dimensional ambiguity, i.e., semantic, spatial and temporal, is presented. A prototype application A3 (A-CUBE) is presented, which extracts various operational contexts in a chemistry experiment from the usage of experimental apparatus and materials. We report the usability experiment and discuss the feasibility of a presentation with ambiguity for active thinking. Additionally, the design principle of a message with semantic ambiguity and future work are presented.
Akifumi Sokan; Ming Wei Hou; Norihide Shinagawa; Hironori Egi; Kaori Fujinami. A tangible experiment support system with presentation ambiguity for safe and independent chemistry experiments. Journal of Ambient Intelligence and Humanized Computing 2011, 3, 125 -139.
AMA StyleAkifumi Sokan, Ming Wei Hou, Norihide Shinagawa, Hironori Egi, Kaori Fujinami. A tangible experiment support system with presentation ambiguity for safe and independent chemistry experiments. Journal of Ambient Intelligence and Humanized Computing. 2011; 3 (2):125-139.
Chicago/Turabian StyleAkifumi Sokan; Ming Wei Hou; Norihide Shinagawa; Hironori Egi; Kaori Fujinami. 2011. "A tangible experiment support system with presentation ambiguity for safe and independent chemistry experiments." Journal of Ambient Intelligence and Humanized Computing 3, no. 2: 125-139.
In this chapter, a case study on augmenting a daily object, mirror, for a contextual ambient display is presented. The mirror presents information relevant to a person who is standing and utilizing unshareable objects, e.g. a toothbrush, in front of it on the periphery of his/her field of vision. We investigated methods of interaction with the mirror by analyzing user preferences against contrastive functionalities. Experiments were conducted by a Wizard-of-Oz method and an in-situ experiment. The results showed that a short absence of the mirror function was not a big issue for the majority of participants once they were interested in presented information. The analysis also allowed us to specify requirements and further research questions in order to make an augmented mirror acceptable.
Kaori Fujinami; Fahim Kawsar. Embedding Context-Awareness into a Daily Object for Improved Information Awareness. Genetic Algorithms and Applications for Stock Trading Optimization 2011, 56 -77.
AMA StyleKaori Fujinami, Fahim Kawsar. Embedding Context-Awareness into a Daily Object for Improved Information Awareness. Genetic Algorithms and Applications for Stock Trading Optimization. 2011; ():56-77.
Chicago/Turabian StyleKaori Fujinami; Fahim Kawsar. 2011. "Embedding Context-Awareness into a Daily Object for Improved Information Awareness." Genetic Algorithms and Applications for Stock Trading Optimization , no. : 56-77.
In this paper, we propose a concept of real-time walking support system for the elderly who need preventive care. The system presents visual information on the floor by a wearable projector. Moreover, we describe a method to reduce swing of projected images during walking. Such unstability of projected images does not only affect the view ability, but also makes it difficult to present spatial information, such as footstep. An implementation of a stabilizing functionality is presented. The result of a quantitative experiment showed that an error in the projected position was reduced by 48.7%. Additionally, the result of a qualitative evaluation supported the effect of stabilization.
Satoshi Murata; Kaori Fujinami. Stabilization of Projected Image for Wearable Walking Support System Using Pico-projector. 2011 IEEE 17th International Conference on Embedded and Real-Time Computing Systems and Applications 2011, 2, 113 -116.
AMA StyleSatoshi Murata, Kaori Fujinami. Stabilization of Projected Image for Wearable Walking Support System Using Pico-projector. 2011 IEEE 17th International Conference on Embedded and Real-Time Computing Systems and Applications. 2011; 2 ():113-116.
Chicago/Turabian StyleSatoshi Murata; Kaori Fujinami. 2011. "Stabilization of Projected Image for Wearable Walking Support System Using Pico-projector." 2011 IEEE 17th International Conference on Embedded and Real-Time Computing Systems and Applications 2, no. : 113-116.
In this article, we propose a middleware that supports a developer to build tabletop information display systems. We focus on an application that projects information close to a particular object on a table. To let a user focus on his/her primary task, the information is presented based on a current phase in a procedure, which we call procedure-awareness. Here, a current phase is recognized through the utilization of objects. The proposed middleware separates information from acquisition and presentation mechanisms: sensors for operational context recognition, sensors for object identification/tracking for “nearby presentation”, and projecting information near an object. A developer just needs to write a set of rules, i.e. application logic, that represent contents for particular operational contexts. Also, by implementing appropriate handlers, any content can be provided. We present the design and the implementation of the middleware and validate the expressiveness of application logics through prototype development.
Kaori Fujinami; Nobuhiro Inagawa; Kosuke Nishijo; Akifumi Sokan. A middleware for a tabletop procedure-aware information display. Multimedia Tools and Applications 2011, 57, 269 -293.
AMA StyleKaori Fujinami, Nobuhiro Inagawa, Kosuke Nishijo, Akifumi Sokan. A middleware for a tabletop procedure-aware information display. Multimedia Tools and Applications. 2011; 57 (2):269-293.
Chicago/Turabian StyleKaori Fujinami; Nobuhiro Inagawa; Kosuke Nishijo; Akifumi Sokan. 2011. "A middleware for a tabletop procedure-aware information display." Multimedia Tools and Applications 57, no. 2: 269-293.
Akifumi Sokan; Hironori Egi; Kaori Fujinami. Spatial connectedness of information presentation for safety training in chemistry experiments. Proceedings of the 22nd ACM international conference on Multimedia 2011, 252 -253.
AMA StyleAkifumi Sokan, Hironori Egi, Kaori Fujinami. Spatial connectedness of information presentation for safety training in chemistry experiments. Proceedings of the 22nd ACM international conference on Multimedia. 2011; ():252-253.
Chicago/Turabian StyleAkifumi Sokan; Hironori Egi; Kaori Fujinami. 2011. "Spatial connectedness of information presentation for safety training in chemistry experiments." Proceedings of the 22nd ACM international conference on Multimedia , no. : 252-253.
Satoshi Murata; Kaori Fujinami. A stabilization method of projected images for wearable projector applications. Proceedings of the 13th International Conference on Predictive Models and Data Analytics in Software Engineering 2011, 469 .
AMA StyleSatoshi Murata, Kaori Fujinami. A stabilization method of projected images for wearable projector applications. Proceedings of the 13th International Conference on Predictive Models and Data Analytics in Software Engineering. 2011; ():469.
Chicago/Turabian StyleSatoshi Murata; Kaori Fujinami. 2011. "A stabilization method of projected images for wearable projector applications." Proceedings of the 13th International Conference on Predictive Models and Data Analytics in Software Engineering , no. : 469.