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The Draftsbook Blog

Articles, deep dives, and notes from the engineering community.

Part 5: Modulation Techniques: ASK, FSK, PSK, QAM, AM & FM in Communications
Nov 5, 20262 min read

Part 5: Modulation Techniques: ASK, FSK, PSK, QAM, AM & FM in Communications

A deep dive into digital and analog modulation schemes: comparing ASK, FSK, PSK, BPSK, QPSK, 16/256-QAM, constellation diagrams, and spectral efficiency.

By Md. Harun-Or-Roshid

Part 4: Supply Chain Management (SCM) & Enterprise Integration (EAI)
Nov 5, 20263 min read

Part 4: Supply Chain Management (SCM) & Enterprise Integration (EAI)

Master Supply Chain Management (SCM) and Enterprise Application Integration (EAI): material flows, bullwhip mitigation, EDI, and event-driven Kafka meshes.

By Md. Harun-Or-Roshid

Part 4: Database Normalization: From 1NF to BCNF and De-normalization Rules
Nov 5, 20264 min read

Part 4: Database Normalization: From 1NF to BCNF and De-normalization Rules

Master relational database normalization: functional dependencies, 1NF to BCNF, lossless-join decomposition, and intentional denormalization strategies.

By Md. Harun-Or-Roshid

Part 5: Pipeline Hazards: Structural, Data Forwarding & Branch Prediction
Nov 5, 20264 min read

Part 5: Pipeline Hazards: Structural, Data Forwarding & Branch Prediction

A masterclass in CPU pipeline hazard mitigation, detailing structural Harvard splits, RAW data forwarding bypass units, load-use bubbles, and dynamic branch prediction.

By Md. Harun-Or-Roshid

Part 6: Polygon Filling: Boundary-Fill, Flood-Fill & Scan-Line Algorithms
Nov 5, 20263 min read

Part 6: Polygon Filling: Boundary-Fill, Flood-Fill & Scan-Line Algorithms

A masterclass in solid polygon filling primitives, comparing 4/8-connected boundary-fill and flood-fill with hardware scan-line Edge Tables and Active Edge Tables.

By Md. Harun-Or-Roshid

Part 4: Cloud Service Models: IaaS, PaaS & SaaS Architecture Explained
Nov 5, 20262 min read

Part 4: Cloud Service Models: IaaS, PaaS & SaaS Architecture Explained

Compare cloud service models: IaaS, PaaS, and SaaS. Analyze the shared responsibility matrix, architectural trade-offs, and pricing models.

By Md. Harun-Or-Roshid

Part 4: Modems: Modulation, Demodulation, Baud Rate & Signal Constellations
Nov 5, 20262 min read

Part 4: Modems: Modulation, Demodulation, Baud Rate & Signal Constellations

A technical examination of modem hardware, digital-to-analog conversion, baud rate versus bit rate, DSL discrete multi-tone, and cable broadband.

By Md. Harun-Or-Roshid

Part 5: Assembly Data Allocation: DB, DW, DD, DQ, EQU & NASM Directives
Nov 5, 20263 min read

Part 5: Assembly Data Allocation: DB, DW, DD, DQ, EQU & NASM Directives

Learn data allocation in x86-64 NASM: DB, DW, DD, DQ, uninitialized BSS reservations (RESB, RESQ), symbolic constants (EQU), and preprocessor macros.

By Md. Harun-Or-Roshid

Part 3: HTTP vs HTTPS: SSL/TLS 1.3 Handshake, Cryptography & Modern Web Protocols
Nov 5, 20263 min read

Part 3: HTTP vs HTTPS: SSL/TLS 1.3 Handshake, Cryptography & Modern Web Protocols

Explore the security revolution from plaintext HTTP to HTTPS, breaking down TLS 1.3 1-RTT handshakes, symmetric vs asymmetric encryption, and PKI.

By Md. Harun-Or-Roshid

Part 4: Instruction Pipelining: The Classic 5-Stage RISC Processor Datapath
Nov 5, 20263 min read

Part 4: Instruction Pipelining: The Classic 5-Stage RISC Processor Datapath

A study of CPU instruction pipelining, exploring the classic 5-stage RISC datapath, inter-stage pipeline registers, and throughput speedup mathematics.

By Md. Harun-Or-Roshid

Part 5: Midpoint Ellipse Generation Algorithm: Two-Region Scan Conversion
Nov 5, 20263 min read

Part 5: Midpoint Ellipse Generation Algorithm: Two-Region Scan Conversion

An in-depth analysis of the Midpoint Ellipse Algorithm, detailing 4-way quadrant symmetry, slope boundary partitioning, and Region 1/Region 2 decision parameters.

By Md. Harun-Or-Roshid

Part 3: Cloud Computing Architecture: Front-End & Back-End Systems
Nov 5, 20263 min read

Part 3: Cloud Computing Architecture: Front-End & Back-End Systems

Explore loosely coupled cloud system architecture: examine the client front-end tier, API gateways, management servers, and distributed back-end storage.

By Md. Harun-Or-Roshid