Researcher Profile - Keiichi Ochiai

All information, except for affiliations, is reprinted from the information registered on researchmap.

写真a

Keiichi Ochiai

Organization

School of Data Science Department of Data Science Associate Professor

External link

Degree

博士（工学） ( 東京大学 )

Papers

Estimating work engagement from online chat tools.

Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai, Shoko Wakamiya, Eiji Aramaki

EPJ Data Sci. 13 ( 1 ) 58 - 58 2024.12

　More details

Publishing type：Research paper (scientific journal)

DOI： 10.1140/epjds/s13688-024-00496-9

researchmap
Detection of Non-designated Evacuation Shelters from Real-time Population Dynamics using Autoencoder-based Anomaly Detection

Keiichi Ochiai, Masayuki Terada, Makoto Hanashima, Hiroaki Sano, Yuichiro Usuda

ACM Transactions on Spatial Algorithms and Systems 2024.1

　More details

Publishing type：Research paper (scientific journal) Publisher：Association for Computing Machinery (ACM)

In a disaster situation, local and municipal governments need to distribute relief supplies and provide administrative support to evacuees. Although people are supposed to evacuate to evacuation shelters designated by local governments, some people take refuge at non-designated facilities, called non-designated evacuation shelters , due to unavoidable circumstances such as damages on the access routes to designated evacuation shelters. Upon occurrence of a disaster, therefore, it is necessary for the local governments to quickly find the locations of non-designated evacuation shelters. In this paper, we propose a method to detect non-designated evacuation shelters based on autoencoder (AE)-based anomaly detection using real-time population dynamics generated from operation data of cellular phone networks. We assume that reconstruction errors of an AE model include both the errors due to characteristic differences between locations and the errors due to anomalies in population dynamics. Thus, we propose to use the ratio of the reconstruction error before and after the earthquake to determine the threshold of anomaly detection. We evaluate the performance of the proposed method on data from three actual earthquakes in Japan. The evaluation results show that our reconstruction-error-based approach can achieve better accuracy for the actual disaster data compared to a baseline method that exploits statistical anomaly detection.

DOI： 10.1145/3643679

researchmap
Poster: End-to-End Privacy-Preserving Vertical Federated Learning using Private Cross-Organizational Data Collaboration.

Keiichi Ochiai, Masayuki Terada

CCS 4955 - 4957 2024

　More details

Publishing type：Research paper (international conference proceedings)

DOI： 10.1145/3658644.3691383

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/ccs/ccs2024.html#OchiaiT24
Anomaly Detection for Population Dynamics using Autoencoder Leveraging Periodic Residual Component in Disaster Situations.

Keiichi Ochiai, Masayuki Terada, Hiroaki Sano, Makoto Hanashima, Yuichiro Usuda

GeoAI@SIGSPATIAL 34 - 42 2023

　More details

Publishing type：Research paper (international conference proceedings)

DOI： 10.1145/3615886.3627739

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/geoai/geoai2023.html#OchiaiTSHU23
Graph Neural Network Tells Us Who is the Communication Enhancer.

Hiroaki Tanaka, Yuuma Jitsunari, Wataru Yamada, Keiichi Ochiai, Shoko Wakamiya, Eiji Aramaki

Big Data 4035 - 4039 2022

　More details

Publishing type：Research paper (international conference proceedings)

DOI： 10.1109/BigData55660.2022.10020623

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/bigdataconf/bigdataconf2022.html#TanakaJYOWA22
Detection of non-designated shelters by extracting population concentrated areas after a disaster (industrial paper).

Keiichi Ochiai, Masayuki Terada, Makoto Hanashima, Hiroaki Sano, Yuichiro Usuda

SIGSPATIAL/GIS 50 - 9 2022

　More details

Publishing type：Research paper (international conference proceedings)

DOI： 10.1145/3557915.3560985

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/gis/gis2022.html#OchiaiTHSU22
Estimating Work Engagement from Online Chat Logs

Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai

5th Asian CHI Symposium 2021 70 - 73 2021.5

　More details

Language：English Publishing type：Research paper (international conference proceedings) Publisher：Association for Computing Machinery, Inc

The Covid-19 pandemic has transformed our lives, and in order to aid in the prevention and spread of infection, a remote work style has rapidly proliferated. As this remote work style has proliferated, new problems have come to light. One problem is that managers cannot fully grasp the engagement level of subordinates such as in terms of absorption, dedication, and vigor due to limited in-person communications. However, as a substitute for in-person communications, online communications via text-based chat tools such as Slack and Microsoft's Teams have become popular. Recognizing the level of work engagement in a remote work setting is difficult, so we propose a new approach that estimates this level using text-based chat tools. To evaluate the proposal, we conduct experiments using actual Slack data. The experimental results reveal that the content of the conversations do not influence the level of work engagement, but the frequency of conversations among the teams and team members does. Therefore, we develop a machine learning model that estimates the level of work engagement using only the frequency and affiliation as features. The model estimates the work engagement level using true and predicted values at a correlation coefficient of 0.72. Since the proposed model uses only the frequency and affiliation, it is valuable in actual business situations.

DOI： 10.1145/3429360.3468184

Scopus

researchmap
Stress Estimation Based on Spatiotemporal Analysis of Smartphone Usage and Sensor Data

情報処理学会論文誌 62 ( 4 ) 1113 - 1127 2021.4

　More details

Language：Japanese Publisher：[出版社不明]

近年わが国ではスマートフォンの普及が進んでおり，スマートフォンを用いたヘルスケア技術に期待が高まってきている．スマートフォンはユーザが日々持ち歩き，使われるものであるため，ユーザの心理状態を反映することが期待できる．本研究では，ユーザのスマートフォン利用や持ち歩きによって収集されるログデータについて，時間的観点，空間的観点の両観点からログを分析し，利用者のストレスを推定する手法を提案する．その結果，21人のユーザにおいて，推定精度88.7%で利用者のストレスの高低度合いを推定可能であり，時間だけでなく空間的観点でログを集計することが有効であることを確認した．
With the spread of smartphones worldwide, there have been growing interests in healthcare using smartphones recently. Smartphones are expected to understand psychological context of those owners because they are usually with owners. In this study, we propose a method to estimate human stress using usage and sensor logs in a smartphone with consideration of spatiotemporal context. To extract spatial contexts of users, the proposed method presents an algorithm of stay detection in most important points that play the role of home and workplace. Our evaluation revealed that the proposed spatial features were effective to extract important contexts related to human stress and successfully combined with the chronological features to improve stress estimation with up to 88.7% accuracy.

DOI： 10.20729/00210563

CiNii Books

CiNii Research

researchmap
Estimating Patient Independence with Sleep Sensors.

Eiji Kumakawa, Wataru Yamada, Keiichi Ochiai, Yusuke Fukazawa, Mizuki Shirai, Hirokazu Masuda

UbiComp/ISWC '21: 2021 ACM International Joint Conference on Pervasive and Ubiquitous Computing and 2021 ACM International Symposium on Wearable Computers 44 - 45 2021

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3460418.3479308

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/huc/ubicomp2021ap.html#KumakawaYOFSM21
Disaster Damage Estimation from Real-time Population Dynamics using Graph Convolutional Network (Industrial Paper).

Keiichi Ochiai, Hiroto Akatsuka, Wataru Yamada, Masayuki Terada

SIGSPATIAL '21: 29th International Conference on Advances in Geographic Information Systems(SIGSPATIAL/GIS) 336 - 345 2021

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3474717.3483972

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/gis/gis2021.html#OchiaiAYT21
リアルタイムな人口変動を利用した災害規模推定における特徴量の検討

落合桂一, 赤塚裕人, 山田渉, 寺田雅之

情報処理学会研究報告データベースシステム 2020 ( DBS-172 ) 2020.12

　More details

Authorship：Lead author

J-GLOBAL

researchmap
人の移動データに基づく地域のクラスタリングとその応用

落合桂一, 寺田雅之

マルチメディア、分散協調とモバイルシンポジウム2020論文集 1480 - 1486 2020.6

　More details

Authorship：Lead author Language：Japanese

researchmap
機械学習を用いたツイート解析と統計的異常検知による通信障害検出システム Reviewed

山田尚志, 落合桂一, 横井靖弘, 神山剛, 鳥居大祐

情報処理学会論文誌コンシューマ・デバイス＆システム（CDS） 10 ( 2 ) 1 - 10 2020.5

　More details

Publishing type：Research paper (scientific journal)

researchmap
Smartphone-based Mental State Estimation: A Survey from a Machine Learning Perspective. Invited Reviewed

Yusuke Fukazawa, Naoki Yamamoto, Takashi Hamatani, Keiichi Ochiai, Akira Uchiyama, Ken Ohta

J. Inf. Process. 28 16 - 30 2020

　More details

Publishing type：Research paper (scientific journal)

DOI： 10.2197/ipsjjip.28.16

researchmap
C-LIME: A Consistency-Oriented LIME for Time-Series Health-Risk Predictions. Reviewed

Taku Ito, Keiichi Ochiai, Yusuke Fukazawa

Knowledge Management and Acquisition for Intelligent Systems - 17th Pacific Rim Knowledge Acquisition Workshop(PKAW) 58 - 69 2020

　More details

Publishing type：Research paper (international conference proceedings) Publisher：Springer

DOI： 10.1007/978-3-030-69886-7_5

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/pkaw/pkaw2020.html#ItoOF20
Gravity of Location-Based Service: Analyzing the Effects for Mobility Pattern and Location Prediction. Reviewed

Keiichi Ochiai, Yusuke Fukazawa, Wataru Yamada, Hiroyuki Manabe, Yutaka Matsuo

Proceedings of the Fourteenth International AAAI Conference on Web and Social Media(ICWSM) 476 - 487 2020

　More details

Publishing type：Research paper (scientific journal) Publisher：AAAI Press

researchmap

Other Link： https://dblp.uni-trier.de/conf/icwsm/2020
Generic POI recommendation. Reviewed

Hisao Katsumi, Wataru Yamada, Keiichi Ochiai

UbiComp/ISWC '20: 2020 ACM International Joint Conference on Pervasive and Ubiquitous Computing and 2020 ACM International Symposium on Wearable Computers 46 - 49 2020

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3410530.3414421

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/huc/ubicomp2020ap.html#KatsumiYO20
Exploiting Graph Convolutional Networks for Representation Learning of Mobile App Usage. Reviewed

Keiichi Ochiai, Naoki Yamamoto, Takashi Hamatani, Yusuke Fukazawa, Takayasu Yamaguchi

2019 IEEE International Conference on Big Data (IEEE BigData) 5379 - 5383 2019.12

　More details

Authorship：Lead author Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.1109/BigData47090.2019.9006428

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/bigdataconf/bigdataconf2019.html#OchiaiYHFY19
Real-time On-Device Troubleshooting Recommendation for Smartphones. Reviewed

Keiichi Ochiai, Kohei Senkawa, Naoki Yamamoto, Yuya Tanaka, Yusuke Fukazawa

KDD 2019 2783 - 2791 2019.8

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3292500.3330669

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/kdd/kdd2019.html#OchiaiSYTF19
Automated inference of cognitive performance by fusing multimodal information acquired by smartphone. Reviewed

Takashi Hamatani, Keiichi Ochiai, Akiya Inagaki, Naoki Yamamoto, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Yuri Terasawa, Tsukasa Okimura, Takaki Maeda

Proceedings of the 2019 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2019 ACM International Symposium on Wearable Computers 921 - 928 2019

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3341162.3346275

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/huc/ubicomp2019ap.html#HamataniOIYFKKK19
Local App Classification using Deep Neural Network based on Mobile App Market Data. Reviewed

Keiichi Ochiai, Fatina Putri, Yusuke Fukazawa

2019 IEEE International Conference on Pervasive Computing and Communications(PerCom) 186 - 191 2019

　More details

Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.1109/PERCOM.2019.8767416

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/percom/percom2019.html#OchiaiPF19
Analyzing the Relationship between Cognitive Performance and Time to Find Intended Mobile App. Reviewed

Keiichi Ochiai, Naoki Yamamoto, Takashi Hamatani, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Yuri Terasawa, Tsukasa Okimura, Takaki Maeda

Proceedings of the 2018 ACM International Joint Conference and 2018 International Symposium on Pervasive and Ubiquitous Computing and Wearable Computers 1686 - 1690 2018

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3267305.3267534

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/huc/ubicomp2018ap.html#OchiaiYHFKKKOTO18
Physiological Stress Level Estimation Based on Smartphone Logs. Reviewed

Naoki Yamamoto, Keiichi Ochiai, Akiya Inagaki, Yusuke Fukazawa, Masatoshi Kimoto, Kazuki Kiriu, Kouhei Kaminishi, Jun Ota, Tsukasa Okimura, Yuri Terasawa, Takaki Maeda

Eleventh International Conference on Mobile Computing and Ubiquitous Network(ICMU) 1 - 6 2018

　More details

Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.23919/ICMU.2018.8653590

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/icmu/icmu2018.html#YamamotoOIFKKKO18
CamTrackPoint: pointing stick for mobile device using rear camera. Reviewed

Wataru Yamada, Hiroyuki Manabe, Hiroyuki Hakoda, Keiichi Ochiai, Daizo Ikeda

Adjunct Proceedings of the 2017 ACM International Joint Conference on Pervasive and Ubiquitous Computing and Proceedings of the 2017 ACM International Symposium on Wearable Computers 321 - 324 2017

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/3123024.3123174

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/huc/ubicomp2017.html#YamadaMHOI17
Recognizing whether a person is eating alone or has company by using wearable devices. Reviewed

Kazuki Kiriu, Keiichi Ochiai, Akiya Inagaki, Naoki Yamamoto, Yusuke Fukazawa, Masatoshi Kimoto, Tsukasa Okimura, Yuri Terasawa, Takaki Maeda, Jun Ota

Tenth International Conference on Mobile Computing and Ubiquitous Network(ICMU) 1 - 2 2017

　More details

Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.23919/ICMU.2017.8330088

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/icmu/icmu2017.html#KiriuOIYFKOTMO17
Multi-label categorizing local event information from micro-blogs. Reviewed

Wataru Yamada, Haruka Kikuchi, Keiichi Ochiai, Shu Takahashi, Yusuke Fukazawa, Hiroshi Inamura, Ken Ohta

Ninth International Conference on Mobile Computing and Ubiquitous Networking(ICMU) 1 - 6 2016

　More details

Publishing type：Research paper (international conference proceedings) Publisher：IEEE

DOI： 10.1109/ICMU.2016.7742090

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/icmu/icmu2016.html#YamadaKOTFIO16
Extracting local event information from micro-blogs for trip planning. Reviewed

Wataru Yamada, Daisuke Torii, Haruka Kikuchi, Hiroshi Inamura, Keiichi Ochiai, Ken Ohta

Eighth International Conference on Mobile Computing and Ubiquitous Networking(ICMU) 7 - 12 2015

　More details

Publishing type：Research paper (international conference proceedings) Publisher：IEEE Computer Society

DOI： 10.1109/ICMU.2015.7061020

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/icmu/icmu2015.html#YamadaTKIOO15
Computational Lighting Reproduction for Facial Live Video with Rigid Facial Motion

Takao Makino, Koichi Takase, Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Nobutoshi Ojima

JOURNAL OF IMAGING SCIENCE AND TECHNOLOGY 55 ( 1 ) 010503-1 - 010503-7 2011.1

　More details

Language：English Publishing type：Research paper (scientific journal) Publisher：I S & T - SOC IMAGING SCIENCE TECHNOLOGY

In this research, we develop a practical lighting reproduction technique to reproduce the appearance of a face under an arbitrary lighting condition in a facial live video with rigid facial motion. The reproduced facial image has texture detail and novel shading by combining image-based components and model-based components. Our technique is practical because it requires using only polarizing filters with the conventional green screen matting technique. (C) 2011 Society for Imaging Science and Technology. [DOI: 10.2352/J.ImagingSci.Technol.2011.55.1.010503]

DOI： 10.2352/J.ImagingSci.Technol.2011.55.1.010503

Web of Science

researchmap
Efficient acquisition of light transport based on separation of direct and global components. Reviewed

Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Yoichi Miyake

SIGGRAPH Asia 2009 Poster 38 - 1 2009

　More details

Authorship：Lead author Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/1666778.1666816

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/siggraph/siggraph2009asiaposters.html#OchiaiTNM09
Efficient acquisition and rendering of transparent and refractive objects using quotient image. Reviewed

Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Kimiyoshi Miyata, Yoichi Miyake

Proceedings of the Conference on Three-Dimensional Image Capture and Applications 2008 680502 - 680502 2008

　More details

Publishing type：Research paper (international conference proceedings) Publisher：SPIE

DOI： 10.1117/12.765860

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/3dica/3dica2008.html#OchiaiTNMM08
Computational lighting reproduction for facial live video with rigid facial motion. Reviewed

Takao Makino, Norimichi Tsumura, Koichi Takase, Ryusuke Honma, Keiichi Ochiai, Nobutoshi Ojima, Toshiya Nakaguchi, Yoichi Miyake

International Conference on Computer Graphics and Interactive Techniques 172 - 172 2007

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

researchmap

Other Link： https://dblp.uni-trier.de/conf/siggraph/2007posters
Gonio-spectral based digital archiving and reproduction system for electronic museum.

Keiichi Ochiai, Norimichi Tsumura, Toshiya Nakaguchi, Kimiyoshi Miyata, Yoichi Miyake

International Conference on Computer Graphics and Interactive Techniques 97 - 97 2006

　More details

Publishing type：Research paper (international conference proceedings) Publisher：ACM

DOI： 10.1145/1179622.1179734

researchmap

Other Link： https://dblp.uni-trier.de/db/conf/siggraph/siggraph2006posters.html#OchiaiTNMM06

▼display all

MISC

オートエンコーダを用いた人口異常検知による避難所開設状況把握の能登半島地震での評価

落合桂一, 寺田雅之, 花島誠人

情報処理学会研究報告(Web) 2024 ( MBL-113 ) 2024

　More details

J-GLOBAL

researchmap
Analyzing paper citation using causal inference

OCHIAI Keiichi, MATSUO Yutaka

Proceedings of the Annual Conference of JSAI JSAI2022 4N1GS301 - 4N1GS301 2022

　More details

Language：Japanese Publisher：The Japanese Society for Artificial Intelligence

Because national science and technology policy decisions can be made based on the impact of each technology, quantifying the impact on research is an important task. Citation counts and impact factors can be used to measure the impact of individual studies. What would have happened without the research, however, is fundamentally a counterfactual phenomenon. Thus, we propose a causal inference approach to quantify the research impact of a specific technical topic. We leverage difference-in-difference to quantify the research impact by applying to bibliometric data. Evaluation results show that deep learning significantly affects computer vision and natural language processing. Besides, deep learning significantly affects cross-field citation especially for speech recognition to computer vision and natural language processing to computer vision.

DOI： 10.11517/pjsai.jsai2022.0_4n1gs301

CiNii Research

researchmap
サービス向上・社会課題解決に貢献するAI スマートフォンログを用いたストレス・注意機能推定技術の開発

山本直樹, 濱谷尚志, 落合桂一, 田中茂樹, 深澤佑介

NTT DOCOMOテクニカル・ジャーナル(Web) 28 ( 4 ) 2021

　More details

J-GLOBAL

researchmap
Reconstruction of Intermittent Measurement Sensor Data Using Stacked Denoising Autoencoder

山本直樹, 落合桂一, 稲垣章弥, 神山剛, 深澤佑介

情報処理学会論文誌ジャーナル(Web) 61 ( 2 ) 2020

　More details

J-GLOBAL

researchmap
生活を充実させるAI技術特集健診データからの健康リスク予測技術の開発

伊藤拓, 落合桂一, 深澤佑介

NTT DOCOMOテクニカル・ジャーナル(Web) 28 ( 2 ) 2020

　More details

J-GLOBAL

researchmap
深層学習によるアプリログからの特徴抽出の検討

落合桂一, 山本直樹, 濱谷尚志, 深澤佑介

情報処理学会研究報告(Web) 2019 ( DPS-179 ) 2019

　More details

J-GLOBAL

researchmap
ストレスと注意機能の相互作用を考慮したスマートフォンログからのストレス推定手法

濱谷尚志, 落合桂一, 山本直樹, 深澤佑介, 木本勝敏, 霧生和樹, 上西康平, 太田順, 寺澤悠理, 沖村宰, 前田貴記

情報処理学会シンポジウムシリーズ(CD-ROM) 2019 ( 1 ) 2019

　More details

J-GLOBAL

researchmap
レコメンドモデルにおけるCTRと相関の高いオフライン検証指標の提案

伊藤拓, 田中茂樹, 落合桂一, 深澤佑介

情報処理学会研究報告(Web) 2019 ( ITS-77 ) 2019

　More details

J-GLOBAL

researchmap
Fast and Diversity-aware Spatio-temporal Search for Twitter using Pre-search

落合桂一, 落合桂一, 鳥居大祐, 深澤佑介, 松尾豊

情報処理学会論文誌ジャーナル(Web) 60 ( 2 ) 2019

　More details

J-GLOBAL

researchmap
対人交流を考慮したスマートフォンログによるストレス推定

霧生和樹, 上西康平, 山本直樹, 濱谷尚志, 落合桂一, 深澤佑介, 木本勝敏, 沖村宰, 寺澤悠理, 前田貴記, 太田順

情報処理学会研究報告(Web) 2019 ( MBL-90 ) 2019

　More details

J-GLOBAL

researchmap
レコメンドモデルにおけるCTRと相関の高いオフライン検証指標の提案

伊藤拓, 田中茂樹, 落合桂一, 深澤佑介

情報処理学会研究報告(Web) 2019 ( DPS-179 ) 2019

　More details

J-GLOBAL

researchmap
深層学習によるアプリログからの特徴抽出の検討

落合桂一, 山本直樹, 濱谷尚志, 深澤佑介

情報処理学会研究報告(Web) 2019 ( ITS-77 ) 2019

　More details

J-GLOBAL

researchmap
時空間的なスマートフォンログ分析に基づく利用者のストレス推定手法

濱谷尚志, 落合桂一, 山本直樹, 深澤佑介, 木本勝敏, 上西康平, 太田順, 寺澤悠理, 沖村宰, 前田貴記

情報処理学会研究報告(Web) 2019 ( ITS-79 ) 2019

　More details

J-GLOBAL

researchmap
Feature Extraction and Arrhythmia Classification from 2-lead ECG using Stacked 1D-convolutional Denoising Autoencoders

高橋柊, 高橋柊, 落合桂一, 深澤佑介

情報処理学会論文誌ジャーナル(Web) 59 ( 12 ) 2018

　More details

J-GLOBAL

researchmap
生体情報を教師データとしたスマートフォンログを用いたストレス状態推定

山本直樹, 落合桂一, 稲垣章弥, 深澤佑介, 木本勝敏, 霧生和樹, 上西康平, 太田順, 沖村宰, 寺澤悠理, 前田貴記

情報処理学会研究報告(Web) 2018 ( DPS-175 ) 2018

　More details

J-GLOBAL

researchmap
深層学習を用いた位置依存性の高いモバイルアプリ抽出手法

落合桂一, ファティナプテリ, 深澤佑介

情報処理学会研究報告(Web) 2018 ( DPS-175 ) 2018

　More details

J-GLOBAL

researchmap
Stacked Convolutional Denoising Autoencodersを用いた2誘導心電図からの特徴抽出および不整脈分類

高橋柊, 高橋柊, 落合桂一, 深澤佑介

情報処理学会研究報告(Web) 2018 ( MBL-88 ) 2018

　More details

J-GLOBAL

researchmap
Recognition of the Social Eating Environment Using a Wearable Device

117 ( 71 ) 151 - 156 2017.6

　More details

Language：Japanese

researchmap
Analysis of Effect of Location-based Service for Human Mobility

117 ( 71 ) 39 - 45 2017.6

　More details

Language：Japanese

researchmap
ユーザ状態推定における推定精度と消費電力の最適化

山本直樹, 落合桂一, 稲垣章弥, 神山剛, 深澤佑介

情報処理学会研究報告(Web) 2017 ( MBL-85 ) 2017

　More details

J-GLOBAL

researchmap
Exraction of Criminal Related Posts from Microblogs based on Rarity and Influence

高橋柊, 菊地悠, 落合桂一, 深澤佑介

情報処理学会論文誌ジャーナル(Web) 58 ( 8 ) 2017

　More details

J-GLOBAL

researchmap
Point-of-Interest Recommendation using Location-based Service Usage

落合桂一, 落合桂一, 深澤佑介, 山田渉, 松尾豊

人工知能学会全国大会論文集(CD-ROM) 31st 2017

　More details

J-GLOBAL

researchmap
from NTT DOCOMO テクニカル・ジャーナル Twitterを用いた地域イベント発見技術

山田渉, 落合桂一, 菊池悠

NTT技術ジャーナル 28 ( 4 ) 33 - 39 2016.4

　More details

Language：Japanese Publisher：電気通信協会

CiNii Books

researchmap
Extracting Local Event Information from Micro-blogs

57 ( 1 ) 123 - 132 2016.1

　More details

Language：Japanese

CiNii Books

researchmap
POI Official Account Classification Method Using Twitter Posts and Profile Information

落合桂一, 落合桂一, 山田渉, 深澤佑介, 菊地悠, 松尾豊

情報処理学会論文誌トランザクションデータベース(Web) 9 ( 2 ) 2016

　More details

J-GLOBAL

researchmap
Toponym Disambiguation Method for Microblogs Using Time-varying Location-related Words

7 ( 2 ) 51 - 60 2014.6

　More details

Language：Japanese

CiNii Books

researchmap
D-037 Realtime Toponym Disambiguation using Location-related Words

Ochiai Keiichi, Torii Daisuke

12 ( 2 ) 169 - 170 2013.8

　More details

Language：Japanese Publisher：Forum on Information Technology

CiNii Books

researchmap
生活密着情報を提供するリアルタイム検索サービスの開発

鳥居大祐, 赤塚隼, 落合桂一

NTT DoCoMoテクニカル・ジャーナル 20 ( 4 ) 12 - 17 2013.1

　More details

Language：Japanese Publisher：電気通信協会

CiNii Books

researchmap

▼display all

Awards

Specially Selected Paper

2022.1 IPSJ Content-based Stock Recommendation Using Smartphone Data

Kohsuke Kubota, Hiroyuki Sato, Wataru Yamada, Keiichi Ochiai, Hiroshi Kawakami

　More details

researchmap
情報処理学会論文誌特選論文

2021.4 情報処理学会時空間的なスマートフォンログ分析に基づく利用者のストレス推定手法

濱谷尚志, 落合桂一, 山本直樹,深澤佑介,木本勝敏,上西康平,太田順,寺澤悠理,沖村宰,前田貴記

　More details

researchmap
Best Paper Award

2021.4 Asian CHI Symposium Estimating Work Engagement from Online Chat Logs

Hiroaki Tanaka, Wataru Yamada, Keiichi Ochiai

　More details

researchmap
Regular Machine Learning Competition Track 2, 4th place

2020.8 KDD Cup 2020 Adversarial Attacks and Defense on Academic Graph

　More details

researchmap
Best Paper Honorable Mentions

2020.6 ICWSM 2020 Gravity of Location-Based Service: Analyzing the Effects for Mobility Pattern and Location Prediction

Keiichi Ochiai, Yusuke Fukazawa, Wataru Yamada, Hiroyuki Manabe, Yutaka Matsuo

　More details

researchmap
優秀プレゼンテーション賞

2020.6 DICOMO 2020 人の移動データに基づく地域のクラスタリングとその応用

　More details

researchmap
Regular Machine Learning Competition Track Task 2, 1st Prize

2019.8 KDD Cup 2019 Simulating the Eﬀects of Eco-Friendly Transportation Selections for Air Pollution Reduction

　More details

researchmap
Best Poster Award

2016.10 ICMU 2016 Fast Spatial Twitter Search Method Using Location Adaptive Range Query

Keiichi Ochiai, Daisuke Torii, Yusuke Fukazawa, Yutaka Matsuo

　More details

researchmap

▼display all