KEIO RESEARCHERS INFORMATION SYSTEM

Profile Summary 【 Display / hide 】

Profile Summary 【 Display / hide 】

• My research interests include theories and methods in optimization, signal processing and data science, and their applications including deep learning. Our goal on the theoretical aspect is to “create innovative algorithms that can solve inverse problems in various fields” mainly via convex optimization techniques. On the application aspect, we aim to “apply cutting-edge mathematics to real-world data and introduce it into operational systems,” e.g., in the weather radar field.

Career 【 Display / hide 】

Career 【 Display / hide 】

• 2014.04

  -

  2017.03

  Japan Society for the Promotion of Science (JSPS), Research Fellowship for Young Scientists (DC1)

• 2017.04

  -

  2022.03

  Ritsumeikan University, College of Information Science and Engineering, Audio and Visual Media Technology Course, Assistant Professor

• 2022.04

  -

  2024.03

  Osaka University, Graduate School of Engineering, Division of Electrical, Electronic and Infocommunications Engineering, Specially Appointed Researcher

• 2022.06

  -

  Present

  Institute of Physical and Chemical Research (RIKEN), RIKEN Center for Computational Science (R-CCS), Data Assimilation Research Team, Visiting Researcher

• 2024.04

  -

  Present

  Keio University, Faculty of Science and Technology, Department of Applied Physics and Physico-Informatics, Senior Assistant Professor

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Academic Background 【 Display / hide 】

Academic Background 【 Display / hide 】

• 2012.03

  Tokyo Institute of Technology, School of Engineering, Department of Computer Science

  University, Graduated

• 2014.03

  Tokyo Institute of Technology, Graduate School of Science and Engineering, Department of Communications and Integrated Systems

  Graduate School, Completed, Master's course

• 2017.03

  Tokyo Institute of Technology, Graduate School of Science and Engineering, Department of Communications and Computer Engineering

  Graduate School, Completed, Doctoral course

Academic Degrees 【 Display / hide 】

Academic Degrees 【 Display / hide 】

• Bachelor (Engineering), Tokyo Institute of Technology, Coursework, 2012.03

• Master (Engineering), Tokyo Institute of Technology, Coursework, 2014.03

• Ph.D. (Engineering), Tokyo Institute of Technology, Coursework, 2017.03

Research Areas 【 Display / hide 】

Research Areas 【 Display / hide 】

• Natural Science / Applied mathematics and statistics

• Informatics / Mathematical informatics

• Informatics / Soft computing

• Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Measurement engineering

Research Keywords 【 Display / hide 】

Research Keywords 【 Display / hide 】

• Optimization

• Signal Processing

• Deep Learning

• Weather Radar

Papers 【 Display / hide 】

Papers 【 Display / hide 】

• Rainfall map creation from weather radar network via convex optimization

  O. Watanabe, A. Egashira, S. Naito, D. Kitahara

  IEICE Technical Report 125 ( 370 ) 236 - 241 2026.03

  Research paper (conference, symposium, etc.), Joint Work, Last author

• Validation of a low-latency gauge correction algorithm for GSMaP in Japan

  J. Koizumi, H. Hirose, T. Ushio, D. Kitahara

  IEICE Technical Report 125 ( 370 ) 230 - 235 2026.03

  Research paper (conference, symposium, etc.), Joint Work, Last author

• Spline knot placement under noise using a cumulative distribution function

  R. Tanabe, H. Arai, D. Kitahara

  IEICE Technical Report 125 ( 370 ) 224 - 229 2026.03

  Research paper (conference, symposium, etc.), Joint Work, Last author

• Validation of the effectiveness of tight windows for STFT phase retrieval

  A. Oshida, K. Takahashi, D. Kitahara

  IEICE Technical Report 125 ( 370 ) 218 - 223 2026.03

  Research paper (conference, symposium, etc.), Joint Work, Last author

• Improving GSMaP precipitation estimates using a modified Kalman filter with lightning flash rate

  A. Veloria, H. Hirose, Y. Wada, S. Hayashi, D. Kitahara, T. Ushio

  IEEE Transactions on Geoscience and Remote Sensing 64   1 - 19 2026.01

  Research paper (scientific journal), Joint Work, Accepted,  ISSN  0196-2892

  • Access to Document (DOI)

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Reviews, Commentaries, etc. 【 Display / hide 】

Reviews, Commentaries, etc. 【 Display / hide 】

• Basics of piecewise polynomials and spline functions: Let's make line charts smooth

  D. Kitahara

  Journal of the Acoustical Society of Japan 78 ( 10 ) 570 - 577 2022.10

  Article, review, commentary, editorial, etc. (scientific journal), Single Work, Lead author, Last author, Corresponding author,  ISSN  0369-4232

  • Access to Document (DOI)

• Spline basics and its application to quantile regression

  D. Kitahara

  IEICE Technical Report 120 ( 142 ) 37 - 42 2020.08

  Research paper, summary (national, other academic conference), Single Work, Lead author, Last author

• Basics of compressed sensing and its application to image acquisition

  A. Hirabayashi, D. Kitahara

  Japanese Journal of Optics 46 ( 10 ) 393 - 397 2017.10

  Article, review, commentary, editorial, etc. (scientific journal), Joint Work, Last author,  ISSN  0389-6625

• Continuation of phase―Algebraic phase unwrapping and its applications

  I. Yamada, D. Kitahara

  Proceedings of the 2016 IEICE Society Conference    SS14 - SS15 2016.09

  Research paper, summary (national, other academic conference), Joint Work, Last author

• 二次元位相アンラップ問題の難しさと面白さ

  D. Kitahara

  The 29th IEICE SIP Symposium  2014.11

  Lecture material (seminar, tutorial, course, lecture, etc.), Single Work, Lead author, Last author

Presentations 【 Display / hide 】

Presentations 【 Display / hide 】

• Initial analysis of robust consistent KDP estimator for Panama S-band radar

  D. Kitahara

  [International presentation]  Panama-Japan Workshop on Tropical Meteorology: Strengthening Resilience to Climate Extremes in Panama (Panama City) , 

  2026.06

  , 

  Oral presentation (general)

• Validation of robust consistent KDP estimator for Panama S-band radar

  S. Naito, D. Kitahara, T. Ushiyama, R. Pinzón, H. De Lima, T. Nakaegawa

  [International presentation]  The 106th AMS Annual Meeting (Houston) , 

  2026.01

  , 

  Poster presentation

• Enhancing GSMaP precipitation estimates over CONUS using a modified Kalman filter with GLM lightning flash rates

  A. Veloria, H. Hirose, Y. Wada, S. Hayashi, D. Kitahara, T. Ushio

  [International presentation]  The 106th AMS Annual Meeting (Houston) , 

  2026.01

  , 

  Oral presentation (invited, special)

• Improved GSMaP precipitation estimates over CONUS using a modified Kalman filter with GLM lightning data

  A. Veloria, H. Hirose, Y. Wada, S. Hayashi, D. Kitahara, T. Ushio

  [International presentation]  The 106th AMS Annual Meeting (Houston) , 

  2026.01

  , 

  Poster presentation

• Robust consistent KDP estimator for radar QPE: data-assimilative optimization using the self-consistency

  D. Kitahara, T. Ushio

  [International presentation]  International Workshop on Hydrometeorological Predictions (Kobe) , 

  2025.11

  , 

  Oral presentation (general)

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Research Projects of Competitive Funds, etc. 【 Display / hide 】

Research Projects of Competitive Funds, etc. 【 Display / hide 】

• 2重偏波フェーズドアレイレーダネットワークに関する研究

  2024.04

  -

  2027.03

  科研費 基盤研究 (A), No Setting, Coinvestigator(s)

• 気候の年々変動と極端気象がパナマ運河流域水循環に与える影響の要因解明

  2023.09

  -

  2029.03

  科研費 国際共同研究加速基金 (海外連携研究), No Setting, Coinvestigator(s)

• 科学的モデリングによる気象レーダの高解像度化

  2021.04

  -

  2024.03

  科研費 基盤研究 (B), No Setting, Coinvestigator(s)

• ノイズロバストな透視可視化に基づく，大規模文化遺跡の３次元計測ビッグデータ活用

  2019.10

  -

  2024.03

  科研費 国際共同研究強化 (B), No Setting, Coinvestigator(s)

• エッジ保存スプライン平滑化による不連続箇所を含む関数の推定とその応用に関する研究

  2019.04

  -

  2023.03

  科研費 若手研究, No Setting, Principal investigator

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Intellectual Property Rights, etc. 【 Display / hide 】

Intellectual Property Rights, etc. 【 Display / hide 】

• 信号処理装置、信号処理方法およびプログラム

  Date applied： 2014-511131  2013.10 

  Date announced： WO2013/157299   

  Date issued： 6041325 

  Patent, Joint

Awards 【 Display / hide 】

Awards 【 Display / hide 】

• 第32回回路とシステムワークショップ奨励賞

  北原 大地, 2020.08, IEICE 回路とシステムワークショップ実行委員会

  Type of Award： Award from Japanese society, conference, symposium, etc.

• 東京電機大学 丹羽保次郎記念論文賞

  北原 大地, 2018.02, 東京電機大学

  Type of Award： Other

• 東京工業大学 手島精一記念研究賞 (博士論文賞)

  北原 大地, 2018.02, 東京工業大学

  Type of Award： Other

• IEEE Signal Processing Society Japan Student Journal Paper Award

  北原 大地, 2016.12, IEEE Signal Processing Society Tokyo Joint Chapter

  Type of Award： Award from Japanese society, conference, symposium, etc.

• IEEE Computational Intelligence Society Japan Chapter Young Researcher Award

  北原 大地, 2016.07, IEEE Computational Intelligence Society Japan Chapter

  Type of Award： Award from Japanese society, conference, symposium, etc.

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Courses Taught 【 Display / hide 】

Courses Taught 【 Display / hide 】

• PRESENTATION TECHNIQUE

  2026

• APPLIED PHYSICS AND PHYSICO-INFORMATICS LABORATORY D

  2026

• APPLIED PHYSICS AND PHYSICO-INFORMATIC PRACTICAL RESEARCH B

  2026

• BACHELOR'S THESIS

  2026

• LABORATORIES IN SCIENCE AND TECHNOLOGY

  2026

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Memberships in Academic Societies 【 Display / hide 】

Memberships in Academic Societies 【 Display / hide 】

• American Meteorological Society, 

  2025.07

  -

  Present

• The Meteorological Society of Japan, 

  2024.07

  -

  Present

• IEICE, 

  2016.07

  -

  Present

• IEEE, 

  2013.01

  -

  Present

Committee Experiences 【 Display / hide 】

Committee Experiences 【 Display / hide 】

• 2018.10

  -

  2022.09

  電子情報通信学会 システムと信号処理サブソサイエティ KWS実行委員

• 2018.06

  -

  2024.05

  電子情報通信学会 基礎境界ソサイエティ 信号処理研究専門委員