use std::ops::BitOr;

struct S(&'static str);

impl BitOr for S {
    type Output = String;
    fn bitor(self, rhs: Self) -> Self::Output {
        format!("{} in {}!", self.0, rhs.0)
    }
}

fn main() {
    println!("{}", S("sum") | S("world"));
}

• TCP HTTP Client (C)
  • Non-blocking connect, DNS multi-A failover, recv timeout
  • Production-ready HTTP/1.1 implementation
• Multi-client Echo Server (C)
  • select() based I/O multiplexing
  • Timeout & keepalive support

• Signal Handling Demo (C)
  • POSIX signal handling with CI/CD automation
  • Interactive demo with automated testing
• Tiny Shell (C)
  • Job control, signal handling, race condition prevention
  • Process management & I/O redirection

• One-liner Challenge: sum in world = suminworld!
• Custom operators & trait implementations

• Linux Kernel CVE-2022-32250 Exploit Development — WHS-2 (White Hat School), Team Project (2024)

  • Implemented a Linux kernel exploit for CVE-2022-32250 (UAF) with:
    • Heap grooming & leakage primitives
    • KASLR-related exploitation steps
    • Privilege escalation technique via modprobe_path overwrite (controlled execution path)

• SKT USIM Hacking Analysis — USIS (University Student Intelligence Society), 3rd Cohort (2025, Team Project)

  • Wrote a readability-first technical report for a mixed-background team (many non-CS members)
  • Focus: USIM/telecom threat surface, core flows around subscriber identity, and security implications across telecom backend components (e.g., HSS/UDM) from an APT-style perspective
  • Role: Primary author of the report, organizing the narrative, diagrams, and explanations to make complex topics digestible

• OpenStack “Open the Window” Security Auditing — SSL 6th Term (Oct 2025 – Jan 2026)

  • Authored a detailed report on the Barbican Key Management module, including architecture analysis and threat modelling.
  • Presented the team’s vulnerability findings (DOM XSS, IDOR, SSRF) in the final briefing, ensuring accurate reproduction and impact analysis.
  • Worked across Skyline‑Console, Cinder, Glance, and Barbican to verify issues and document mitigation steps.

• ML‑based Flood Prediction (Han River) — Hydrology / ML Coursework Project (2024)
  • Proposed the project topic and led the effort to build an LSTM‑based time‑series model for predicting Han River water levels using real‑world data.
  • Focused on rigorous evaluation, feature engineering, and iterative model improvement.
  • This research concept later inspired the Social Crab hardware project in the BitCrab embedded systems club.

• Social Crab PCB Design — BitCrab Embedded Systems Club (Yonsei University) / 2024 IHEI Workstation Social Innovation Project (2024, Team Project)
  • As part of a small team from BitCrab, executed this hardware project inspired by our flood-prediction coursework, applying data-driven insights to embedded design for social impact (e.g., flood monitoring IoT prototype).
  • Designed a custom PCB for Raspberry Pi Pico, focusing on power-stability testing and embedded prototyping with protocols like I2C/SPI/UART.
  • Contributed to bring-up/testing workflows and documented processes for reproducible results.

1. ⬆️ Pushed undefined commit(s) to sumin-world/sumin-world
   
2. ⬆️ Pushed undefined commit(s) to sumin-world/sumin-world
   
3. ⬆️ Pushed undefined commit(s) to sumin-world/sumin-world
   
4. ⬆️ Pushed undefined commit(s) to sumin-world/sumin-world
   
5. ⬆️ Pushed undefined commit(s) to sumin-world/sumin-world
   

• IPv4 시장 가격 vs 클라우드 과금: v4/v6 연결 지연 측정
• CSAPP 1.6 메모리 계층 (Memory Hierarchy) 정리
• Mac M4(ARM64)에서 x86_64 Pwnable 환경 세팅: Docker
• 일어서기
• ️리눅스 백신 실습2 - ClamAV 실시간 보호 구현 (inotify + bash 자동화)

• System Hacking: Buffer overflow, heap exploitation, ROP chains
• Network Security: ARP/DNS spoofing, session hijacking, packet analysis
• Linux Internals: Syscalls, process management, memory subsystem
• CTF Practice: Dreamhack, pwnable.kr, OverTheWire

💡 "Learning by building, one system call at a time"