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

• rust-security-suminworld — Cargo workspace (7 crates, 64 tests, 0 warnings)
  • port_scanner — Async TCP port scanner (Tokio, 1024 concurrent connections)
  • discord_audit_bot — Discord server security audit bot (Serenity, 5-module architecture)
  • packet-match-fuzz — KMP pattern matcher & mutation fuzzer for packet payloads
  • wifi_audit — Passive 802.11 Wi-Fi auditor (Beacon/Probe analysis, libpcap)
  • crypto — Educational cryptography toolkit (Caesar, Vigenère, XOR, Feistel, RSA, FNV-1a)
  • merkle — SHA-256 Merkle tree with domain-separated hashing & inclusion proofs
  • kernel-features — Rust-for-Linux language features study (Field Projection, In-place Init, Arbitrary Self Types)
  • cache — Flush+Reload cache side-channel PoC (C)
• One-liner Challenge: sum in world = suminworld! — Custom operators & trait implementations

• Linux Kernel CVE-2022-32250 Exploit Development — WHS-2nd (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.

• Channel Analysis Lab (Python)
  • Statistical worst-case analysis toolkit for high-speed serial channels (PCIe 6.0, USB4, 112G PAM4)
  • Vectorized Monte Carlo engine (NumPy, 10–50× speedup), 2^3 deterministic corner sweep, 2^k full-factorial DOE sensitivity
  • Corner vs MC gap analysis, main-effect Pareto ranking for manufacturing tolerance budgeting
  • Built on scikit-rf / Touchstone S-parameter data — CI-ready with Makefile pipeline

• NaviBlock (C++, Python) — Team NAVI, Yonsei IHEI Workstation (2025)
  • AI-powered spatial cognition training system for visually impaired users
  • 3×3 NFC sensor grid (PN532 ×9, TCA9548A I2C mux) on ESP32, communicating with mobile app via BLE
  • RAG-based voice assistant (GPT-4 + FAISS + pyttsx3) for on-demand spatial cognition Q&A
  • Role: Product Management, Hardware Product Development (PCB bring-up, firmware, sensor integration)

• Laneige INSIGHT MVP (Python)
  • Automated market intelligence pipeline for K-Beauty on Amazon
  • Snapshot collection → Change detection → AI root-cause analysis (Groq/Claude/rule fallback) → ROI simulation
  • Perceptual hashing (pHash) for thumbnail A/B test detection
  • Streamlit dashboard with competitive analysis & ranking trend charts

1. ⭐ Starred sumin-world/drasi-core
   
2. 💬 Commented on #274 in drasi-project/drasi-core
   
3. 💬 Commented on #274 in drasi-project/drasi-core
   
4. ❗️ Opened issue #285 in drasi-project/drasi-core
   
5. ⬆️ Pushed undefined commit(s) to sumin-world/drasi-core
   

• 일어서기
• CSAPP 1.4: Processors Read and Interpret Instructions Stored in Memory
• 텍스트에서 지식 그래프 추출하기 - Extracting Knowledge Graphs From Text With GPT4o
• IPv4 시장 가격 vs 클라우드 과금: v4/v6 연결 지연 측정
• CSAPP 1.6 메모리 계층 (Memory Hierarchy) 정리

• 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"