https://kibotos.dev/en/ A developer's notebook — deep dives into computer science coursework, from networks and operating systems to cloud computing and software engineering, alongside hands-on notes from real projects, debugging sessions and tools I build along the way. en undefined (seren-wib) undefined (seren-wib) Fri, 09 Oct 2026 00:00:00 GMT https://kibotos.dev/en/blog/ai/ai-07-02-rag/ https://kibotos.dev/en/blog/ai/ai-07-02-rag/ RAG(Retrieval Augmented Generation) process: indexing, chunking strategies, retrieval, generation Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) AI https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw1-cloud-basics/ https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw1-cloud-basics/ Definition of cloud computing, ways to scale performance (clustering, virtualization), CPU/memory/I/O virtualization, how HPC, HTC, grid and cloud relate, three key issues in data center operation Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Cloud Computing https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw2-kvm-vm-cluster/ https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw2-kvm-vm-cluster/ Three Rocky Linux VMs on an M3 Mac with UTM nested virtualization + KVM/libvirt: static IPs, GRUB_TIMEOUT=0, virt-clone cloning, /etc/hosts, ping, SSH key authentication, fixing the nested-virtualization boot hang (pci=nomsi) Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Cloud Computing https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw3-htcondor-cluster/ https://kibotos.dev/en/blog/cloud-computing/cloud-computing-hw3-htcondor-cluster/ Building an HTCondor cluster on 3 Rocky Linux VMs (central manager, submit, execute), submitting 7 kinds of jobs with jds files, fixing the HTCondor 25.x multi-queue error and aarch64 requirements, exercises from Chapters 2–6 (multitenancy, SSH, public keys, slots, GPG, DAGMan, etc.) Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Cloud Computing https://kibotos.dev/en/blog/computer-systems/computer-systems-ch1-big-picture/ https://kibotos.dev/en/blog/computer-systems/computer-systems-ch1-big-picture/ Scope of computer science, problems and algorithms (Euclidean algorithm), how C code gets executed, abstraction Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Computer Systems https://kibotos.dev/en/blog/computer-systems/computer-systems-ch2-data-representation/ https://kibotos.dev/en/blog/computer-systems/computer-systems-ch2-data-representation/ Bits and logic gates, flip-flops and registers, storage (RAM/ROM, HDD/SSD), representing text, images, video and audio, two's complement, floating point and IEEE 754 Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Computer Systems https://kibotos.dev/en/blog/git/git-cheatsheet/ https://kibotos.dev/en/blog/git/git-cheatsheet/ Git/GitHub basic concepts, checking status, pull, resolving conflicts, commit/push, undoing changes Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Git https://kibotos.dev/en/blog/network/network-ch9-wan-1/ https://kibotos.dev/en/blog/network/network-ch9-wan-1/ Circuit Switching(Establish/Transfer/Disconnect), Blocking & Non-blocking network, Space Division switching, Packet Switching Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/software-engineering/software-engineering-ch1-overview/ https://kibotos.dev/en/blog/software-engineering/software-engineering-ch1-overview/ Definition and classification of software, the Code-and-Fix model and the software crisis, definition of software engineering, the PPT framework, SDLC Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Software Engineering https://kibotos.dev/en/blog/software-engineering/software-engineering-ch2-process-models/ https://kibotos.dev/en/blog/software-engineering/software-engineering-ch2-process-models/ Deliverables of each SDLC phase, function-, data- and object-oriented development methodologies, the four categories of life cycle processes, comparison of waterfall, prototyping, spiral, V-model, iterative incremental, agile (Scrum) and XP Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) Software Engineering https://kibotos.dev/en/blog/sql/sql-mysql-cheatsheet/ https://kibotos.dev/en/blog/sql/sql-mysql-cheatsheet/ MySQL installation and service management, connecting, DBs/tables, CRUD, backups, user privileges, password reset Fri, 09 Oct 2026 00:00:00 GMT undefined (seren-wib) SQL https://kibotos.dev/en/blog/ai/ai-05-03-deep-learning/ https://kibotos.dev/en/blog/ai/ai-05-03-deep-learning/ deep learning, vanishing gradient, weight initialization, overfitting, optimizers Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) AI https://kibotos.dev/en/blog/ai/ai-05-04-cnn/ https://kibotos.dev/en/blog/ai/ai-05-04-cnn/ CNN structure, convolution, gradient computation, pooling Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) AI https://kibotos.dev/en/blog/ai/ai-06-01-llm/ https://kibotos.dev/en/blog/ai/ai-06-01-llm/ language model, LLM basics, transformer, attention, BERT/GPT, LLM training, multimodal LLM Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) AI https://kibotos.dev/en/blog/ai/ai-07-01-ai-agent/ https://kibotos.dev/en/blog/ai/ai-07-01-ai-agent/ AI agent concepts, agent types, components, runtime, MCP/A2A, frameworks, prompt engineering Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) AI https://kibotos.dev/en/blog/os/os-13-io/ https://kibotos.dev/en/blog/os/os-13-io/ I/O hardware, I/O devices, polling, interrupts, DMA, and I/O software layers Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-14-storage/ https://kibotos.dev/en/blog/os/os-14-storage/ secondary storage, HDD structure, disk performance, disk scheduling algorithms Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-15-file-system/ https://kibotos.dev/en/blog/os/os-15-file-system/ file system basics, mapping problem, directories, mounting, disk layout, VFS internals Tue, 16 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-10-virtual-memory-1/ https://kibotos.dev/en/blog/os/os-10-virtual-memory-1/ hex, paging, virtual address, page table, demand paging, segmentation Mon, 15 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-11-virtual-memory-2/ https://kibotos.dev/en/blog/os/os-11-virtual-memory-2/ page table structures, two-level and multi-level page tables, TLB, page fault handling Mon, 15 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-12-virtual-memory-3/ https://kibotos.dev/en/blog/os/os-12-virtual-memory-3/ page replacement algorithms, frame allocation, thrashing, working set, shared memory, COW, mmap Mon, 15 Jun 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/network/network-ch1-2-overview/ https://kibotos.dev/en/blog/network/network-ch1-2-overview/ Network overview, protocols (OSI/TCP-IP), network layer, IP addressing/subnetting, routing (RIP/OSPF), transport layer (TCP/UDP), wireless networks (Ad-Hoc/WMN/WSN) Sun, 14 Jun 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch7-data-link/ https://kibotos.dev/en/blog/network/network-ch7-data-link/ Flow control, Sliding Window, Error control, ARQ(Stop-and-Wait, Go-Back-N, Selective-Reject), HDLC Sat, 13 Jun 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch8-multiplexing/ https://kibotos.dev/en/blog/network/network-ch8-multiplexing/ Multiplexing(MUX/DEMUX), FDM, TDM, WDM, Duplex(FDD/TDD), Multiple Channel Access(FDMA/TDMA) Sat, 13 Jun 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/unity/unity-01-basics/ https://kibotos.dev/en/blog/unity/unity-01-basics/ An overview of Unity's basic structure, centered on Scene, GameObject and Component Sun, 10 May 2026 00:00:00 GMT undefined (seren-wib) Unity https://kibotos.dev/en/blog/unity/unity-err/ https://kibotos.dev/en/blog/unity/unity-err/ How to fix the error that occurs when using UnityEngine.Input after switching to the Input System package Sun, 10 May 2026 00:00:00 GMT undefined (seren-wib) Unity https://kibotos.dev/en/blog/network/network-ch3-data-transmission/ https://kibotos.dev/en/blog/network/network-ch3-data-transmission/ data transmission, signal, frequency domain, data rate, bandwidth, transmission impairments, channel capacity Fri, 08 May 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch4-transmission-media/ https://kibotos.dev/en/blog/network/network-ch4-transmission-media/ twisted pair, coaxial cable, optical fiber, guided media, unguided media, satellite microwave Fri, 08 May 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch4a-appendix-antenna-propagation/ https://kibotos.dev/en/blog/network/network-ch4a-appendix-antenna-propagation/ antenna basics, electromagnetic wave characteristics, radiation pattern, directivity, gain, polarization Fri, 08 May 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch5-encoding/ https://kibotos.dev/en/blog/network/network-ch5-encoding/ NRZ, Manchester, Scrambling, ASK, FSK, PSK, QAM, PCM, Delta Modulation Fri, 08 May 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/network/network-ch6-error-correction/ https://kibotos.dev/en/blog/network/network-ch6-error-correction/ parity check, CRC, checksum, FEC, Hamming distance, block code Fri, 08 May 2026 00:00:00 GMT undefined (seren-wib) Network https://kibotos.dev/en/blog/os/os-08-scheduling/ https://kibotos.dev/en/blog/os/os-08-scheduling/ scheduling, starvation, state queue, FCFS/FIFO, SJF, SRTF, RR, multilevel queue, multilevel feedback queue Wed, 06 May 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-09-memory/ https://kibotos.dev/en/blog/os/os-09-memory/ memory management, fixed/variable partitions, overlays, swapping, virtual memory Wed, 06 May 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-06-sync-1/ https://kibotos.dev/en/blog/os/os-06-sync-1/ sync, critical section, locks Tue, 05 May 2026 00:00:00 GMT undefined (seren-wib) OS https://kibotos.dev/en/blog/os/os-07-sync-2/ https://kibotos.dev/en/blog/os/os-07-sync-2/ sync, semaphores, monitors Tue, 05 May 2026 00:00:00 GMT undefined (seren-wib) OS