Keiichi Ochiai

43 papers A* 6A 1B 2C 1Journal 8Unranked 25

Year	Rank	Type	Title / Venue / Authors
2026	A*	`conf`	Estimating Shared Mental Models via Communication-Categorized Directed Graphs. CHI Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai, Shaowen Peng, Shoko Wakamiya, Eiji Aramaki
2025	J	`jnl`	A Causal Inference Approach for Quantifying Research Impact. CoRR Keiichi Ochiai, Yutaka Matsuo
2025	—	`conf`	Trajectory Prediction Using Spatiotemporal BERT Leveraging Collective Trajectories. SIGSPATIAL/GIS Keiichi Ochiai
2024	A*	`conf`	Bicode: A Hybrid Blinking Marker System for Event Cameras. ICRA Takuya Kitade, Wataru Yamada, Keiichi Ochiai, Michita Imai
2024	—	`conf`	Cross-city-aware Spatiotemporal BERT. HuMob-Challenge@SIGSPATIAL Meisaku Suzuki, Yusuke Fukushima, Ryo Koyama, Hayato Kumagai, Tomohiro Mimura, Keiichi Ochiai
2024	J	`jnl`	Detection of Non-Designated Evacuation Shelters from Real-Time Population Dynamics Using Autoencoder-Based Anomaly Detection. ACM Trans. Spatial Algorithms Syst. Keiichi Ochiai, Masayuki Terada, Makoto Hanashima, Hiroaki Sano, Yuichiro Usuda
2024	J	`jnl`	Estimating work engagement from online chat tools. EPJ Data Sci. Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai, Shoko Wakamiya, Eiji Aramaki
2024	A*	`conf`	Poster: End-to-End Privacy-Preserving Vertical Federated Learning using Private Cross-Organizational Data Collaboration. CCS Keiichi Ochiai, Masayuki Terada
2024	J	`jnl`	Shadowed Speech: An Approach for Slowing Speech Rate Using Adaptive Delayed Auditory Feedback. J. Inf. Process. Mariko Chiba, Wataru Yamada, Keiichi Ochiai
2023	—	`conf`	Anomaly Detection for Population Dynamics using Autoencoder Leveraging Periodic Residual Component in Disaster Situations. GeoAI@SIGSPATIAL Keiichi Ochiai, Masayuki Terada, Hiroaki Sano, Makoto Hanashima, Yuichiro Usuda
2023	—	`conf`	BaroDepth: A Method of Estimating Depth with Barometric Pressure Sensors in Smartphones. UbiComp/ISWC Adjunct Eiji Kumakawa, Wataru Yamada, Keiichi Ochiai
2023	J	`jnl`	Characterizing Generic POI: A Novel Approach for Discovering Tourist Attractions. J. Inf. Process. Hisao Katsumi, Wataru Yamada, Keiichi Ochiai
2023	—	`conf`	Stay Ahead of the Competition: An Approach for Churn Prediction by Leveraging Competitive Service App Usage Logs. UbiComp/ISWC Adjunct Hisao Katsumi, Kohsuke Kubota, Wataru Yamada, Keiichi Ochiai
2022	—	`conf`	Anywhere Hoop: Virtual Free Throw Training System. UIST (Adjunct Volume) Masayasu Sumiya, Wataru Yamada, Keiichi Ochiai
2022	J	`jnl`	Content-based Stock Recommendation Using Smartphone Data. J. Inf. Process. Kohsuke Kubota, Hiroyuki Sato, Wataru Yamada, Keiichi Ochiai, Hiroshi Kawakami
2022	—	`conf`	Detection of non-designated shelters by extracting population concentrated areas after a disaster (industrial paper). SIGSPATIAL/GIS Keiichi Ochiai, Masayuki Terada, Makoto Hanashima, Hiroaki Sano, Yuichiro Usuda
2022	B	`conf`	Encouraging Crowd Avoidance Behavior using Dynamic Pricing Framework Towards Preventing the Spread of COVID-19. IEEE Big Data Keiichi Ochiai, Hiroyuki Sato, Hiroshi Kawakami, Takahiro Ide, Toru Otaki, Akira Yamada, Tatsuya Yano, Hiroki Okawa, Takuya Shirai, Yutaka Arakawa
2022	B	`conf`	Graph Neural Network Tells Us Who is the Communication Enhancer. IEEE Big Data Hiroaki Tanaka, Yuuma Jitsunari, Wataru Yamada, Keiichi Ochiai, Shoko Wakamiya, Eiji Aramaki
2022	A*	`conf`	Janus Screen: Screen with Switchable Projection Surfaces Using Wire Grid Polarizer. CHI Wataru Yamada, Sawa Korogi, Keiichi Ochiai
2022	—	`conf`	Shadowed Speech: an Audio Feedback System which Slows Down Speech Rate. UIST (Adjunct Volume) Mariko Chiba, Wataru Yamada, Keiichi Ochiai
2021	—	`conf`	Disaster Damage Estimation from Real-time Population Dynamics using Graph Convolutional Network (Industrial Paper). SIGSPATIAL/GIS Keiichi Ochiai, Hiroto Akatsuka, Wataru Yamada, Masayuki Terada
2021	—	`conf`	Estimating Patient Independence with Sleep Sensors. UbiComp/ISWC Adjunct Eiji Kumakawa, Wataru Yamada, Keiichi Ochiai, Yusuke Fukazawa, Mizuki Shirai, Hirokazu Masuda
2021	—	`conf`	Estimating Work Engagement from Online Chat Logs. AsianCHI@CHI Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai
2021	—	`conf`	Memory Efficient Adversarial Attacks on Graphs: A Winning Solution for KDD Cup 2020. ICMU Keiichi Ochiai, Takuya Chida, Keita Yokoyama, Daisuke Koizumi, Hiroaki Tanaka, Akihiro Kawana
2021	J	`jnl`	Simulating the Effects of Eco-Friendly Transportation Selections for Air Pollution Reduction. CoRR Keiichi Ochiai, Tsukasa Demizu, Shin Ishiguro, Shohei Maruyama, Akihiro Kawana
2020	C	`conf`	C-LIME: A Consistency-Oriented LIME for Time-Series Health-Risk Predictions. PKAW Taku Ito, Keiichi Ochiai, Yusuke Fukazawa
2020	—	`conf`	Generic POI recommendation. UbiComp/ISWC Adjunct Hisao Katsumi, Wataru Yamada, Keiichi Ochiai
2020	A	`conf`	Gravity of Location-Based Service: Analyzing the Effects for Mobility Pattern and Location Prediction. ICWSM Keiichi Ochiai, Yusuke Fukazawa, Wataru Yamada, Hiroyuki Manabe, Yutaka Matsuo
2020	J	`jnl`	Smartphone-based Mental State Estimation: A Survey from a Machine Learning Perspective. J. Inf. Process. Yusuke Fukazawa, Naoki Yamamoto, Takashi Hamatani, Keiichi Ochiai, Akira Uchiyama, Ken Ohta
2019	—	`conf`	Automated inference of cognitive performance by fusing multimodal information acquired by smartphone. UbiComp/ISWC Adjunct Takashi Hamatani, Keiichi Ochiai, Akiya Inagaki, Naoki Yamamoto, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Yuri Terasawa, Tsukasa Okimura, Takaki Maeda
2019	—	`conf`	Exploiting Graph Convolutional Networks for Representation Learning of Mobile App Usage. IEEE BigData Keiichi Ochiai, Naoki Yamamoto, Takashi Hamatani, Yusuke Fukazawa, Takayasu Yamaguchi
2019	A*	`conf`	Local App Classification using Deep Neural Network based on Mobile App Market Data. PerCom Keiichi Ochiai, Fatina Putri, Yusuke Fukazawa
2019	A*	`conf`	Real-time On-Device Troubleshooting Recommendation for Smartphones. KDD Keiichi Ochiai, Kohei Senkawa, Naoki Yamamoto, Yuya Tanaka, Yusuke Fukazawa
2018	—	`conf`	Analyzing the Relationship between Cognitive Performance and Time to Find Intended Mobile App. UbiComp/ISWC Adjunct Keiichi Ochiai, Naoki Yamamoto, Takashi Hamatani, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Yuri Terasawa, Tsukasa Okimura, Takaki Maeda
2018	—	`conf`	Physiological Stress Level Estimation Based on Smartphone Logs. ICMU Naoki Yamamoto, Keiichi Ochiai, Akiya Inagaki, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Tsukasa Okimura, Yuri Terasawa, Takaki Maeda
2017	—	`conf`	CamTrackPoint: pointing stick for mobile device using rear camera. UbiComp/ISWC Adjunct Wataru Yamada, Hiroyuki Manabe, Hiroyuki Hakoda, Keiichi Ochiai, Daizo Ikeda
2017	—	`conf`	Recognizing whether a person is eating alone or has company by using wearable devices. ICMU Kazuki Kiriu, Keiichi Ochiai, Akiya Inagaki, Naoki Yamamoto, Yusuke Fukazawa, Masatoshi Kimoto, Tsukasa Okimura, Yuri Terasawa, Takaki Maeda, Jun Ota
2016	—	`conf`	Multi-label categorizing local event information from micro-blogs. ICMU Wataru Yamada, Haruka Kikuchi, Keiichi Ochiai, Shu Takahashi, Yusuke Fukazawa, Hiroshi Inamura, Ken Ohta
2015	—	`conf`	Extracting local event information from micro-blogs for trip planning. ICMU Wataru Yamada, Daisuke Torii, Haruka Kikuchi, Hiroshi Inamura, Keiichi Ochiai, Ken Ohta
2009	—	`conf`	Efficient acquisition of light transport based on separation of direct and global components. SIGGRAPH ASIA Posters Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake
2008	—	`conf`	Efficient acquisition and rendering of transparent and refractive objects using quotient image. Three-Dimensional Image Capture and Applications Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Kimiyoshi Miyata, Yoichi Miyake
2007	—	`conf`	Computational lighting reproduction for facial live video with rigid facial motion. SIGGRAPH Posters Takao Makino, Norimichi Tsumura, Koichi Takase, Ryusuke Honma, Keiichi Ochiai, Nobutoshi Ojima, Toshiya Nakaguchi, Yoichi Miyake
2006	—	`conf`	Gonio-spectral based digital archiving and reproduction system for electronic museum. SIGGRAPH Research Posters Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Kimiyoshi Miyata, Yoichi Miyake