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PICK UP [2026] 10 Recommended Technical Books for Engineers: Field-by-Field Classics from a Working Engineer's Perspective A field-by-field guide to classic technical books on code quality, Linux, Git, design … PICK UP 12 Recommended Books for Learning Signal Processing, Machine Learning, and Control in Python (2026, by Level) A curated, level-by-level selection of Japanese-language technical books for learning …

RSA Encryption Theory, Key Generation, Encryption, and Decryption in Python (pow, math.gcd, extended Euclidean, Miller-Rabin)

February 25, 2026 29 min read

Algorithm Cryptography Python

Fast Fourier Transform (FFT): Theory and Python Implementation with scipy.fft and numpy.fft

February 25, 2026 12 min read

Signal Processing Python Algorithm

Moving Average Filters Compared: SMA, WMA, and EMA in Python

February 25, 2026 18 min read

Filtering Signal Processing Python

Extended Kalman Filter (EKF): Theory and Python Implementation

February 24, 2026 24 min read

Machine Learning Filtering Python

Kalman Filter: Theory and Python Implementation

February 24, 2026 20 min read

Machine Learning Filtering Python

Security Certification Comparison: CISSP vs Japan's Registered Information Security Specialist

February 23, 2026 3 min read

Security Certification

Kalman Smoother (Rauch-Tung-Striebel / RTS): Forward-Backward Recursion and Python Implementation (numpy.linalg.inv)

February 23, 2026 22 min read

Machine Learning Filtering Signal Processing Python

Python Progress Bars: tqdm.tqdm, tqdm.notebook, tqdm.auto, tqdm.pandas, and a From-Scratch Implementation

February 23, 2026 19 min read

Python Programming Tips

Matplotlib Practical Tips: Publication-Quality Figures in Python (plt.rcParams, savefig, colormap, subplots, tight_layout)

February 23, 2026 17 min read

Python Matplotlib Data Visualization

Particle Filter Python Implementation: Comparing Resampling Methods

February 23, 2026 22 min read

Machine Learning Filtering Monte Carlo Method Python

Low-Pass Filter Design and Comparison: Moving Average, Butterworth, and Chebyshev

February 23, 2026 19 min read

Filtering Signal Processing Python

Bayesian Optimization: Fundamentals and Python Implementation

February 23, 2026 14 min read

Machine Learning Optimization Bayesian Statistics Python

MPPI (Model Predictive Path Integral): A Unified View with the Cross-Entropy Method

February 15, 2026 24 min read

Machine Learning Optimization Monte Carlo Method Control Python

Cubature Kalman Filter (CKF): Theory and Python Implementation

February 15, 2026 25 min read

Machine Learning Filtering Python

Resolving Timezone Mismatch Issues Between Prisma and MySQL

January 25, 2026 14 min read

Prisma MySQL Timezone JST Development

Micro Hardening Training Participation Report

August 21, 2025 2 min read

Hackfes 2025 Participation Notes

July 19, 2025 5 min read

Notes from Day 1 of AWS JumpStart 2025

March 13, 2025 5 min read

JAWS DAYS 2025 Event Report

March 2, 2025 3 min read

Spending 180,000 Yen Out of Pocket to Take the CISSP Exam

November 9, 2024 2 min read