🧠 Daily Study Log [2025-09-16]
Learned classical substitution ciphers in cryptography, explored positive psychology foundations, discussed creativity strategies in AI convergence, developed a new lifestyle idea, and began studying diffusion models in vision.

📚 Classes

• Cryptography: Studied classical substitution ciphers such as Hill cipher and Polybius square cipher, gaining insight into their mathematical foundations.
• Positive Psychology: Learned about the definition and framework of positive psychology introduced by Martin Seligman, focusing on its role in well-being.
• AI Creative Convergence Strategy: Explored the nature of creativity and discussed methods for fostering creative idea generation in individuals and organizations.

💡 Idea

• Proposed a new lifestyle idea: Pants First
• Inspired by the challenge of coordinating outfits starting from pants when preparing to go out.
• Aims to streamline outfit matching and reduce time spent choosing clothes.

📖 Paper Study

• Began study of Denoising Diffusion Probabilistic Models (DDPM).
• Key insights:
  • Diffusion reframes image generation as a denoising process.
  • Training is stable compared to GANs and avoids mode collapse.
  • The forward process adds Gaussian noise; the reverse process learns to remove it step by step.
  • Achieved state-of-the-art results on CIFAR-10 and LSUN at the time of publication.

✅ TL;DR

📍 Learned Hill cipher and other substitution ciphers
📍 Studied positive psychology and its definitions by Seligman
📍 Explored creativity strategies in AI convergence
📍 Proposed Pants First lifestyle idea
📍 Started DDPM paper study on diffusion models