JIHUN CHOI
Mechanical Engineering Graduate — Design & Systems Integration
Status
Open to work
Location
Toronto, ON
B.Eng.
Oct 2026
Scale
NTS
jihun5475@gmail.com (647) 877-7157 linkedin.com/in/jihun-choi York University — Lassonde School of Engineering, B.Eng. Mechanical Engineering

Designs get tested
before they're trusted.

Mechanical Engineering graduate specializing in simulation-driven design — CAD, FEA, CFD, and iterative prototyping — across marine propulsion, drivetrains, and renewable energy systems. Now targeting automotive & manufacturing engineering roles.

−75%
Control supply voltage, 20 V to 5 V
25 kn
Propulsor speed, 25kW limit
2.4:1
Two-stage e-bike gear reduction
FIG 0 — CFD streamline field, marine propulsor hull assembly
SHEET 02/06ExperienceREV A
Mechanical Design & Systems Integration — CAN‑YU
Sep 2025 – Apr 2026 · Toronto, ON
Engineering Design Project · High-Performance Marine Propulsor
  • Designed and iterated a marine propulsion drivetrain in SolidWorks for a 25-knot speed target, 1,160 N of estimated hydrodynamic drag, and a 25 kW power constraint; evaluated propulsion geometry and mechanical packaging tradeoffs.
  • Developed detailed assemblies for drive shafts, bevel gears, bearing supports, and propeller mounts; applied CFD and FEA to assess fluid loading, structural stress, and drivetrain interfaces before revising components.
  • Reduced control supply voltage by 75% (20 V to 5 V) using a buck converter; integrated H-bridge motor control, a DC motor, and linear actuators to support electrically powered steering and propeller tilt.
  • Built and refined drivetrain prototypes to examine torque transfer, shaft alignment, and mechanical fit; translated integration observations into updated CAD assemblies and revised subsystem interfaces.
3
Test video 01
4
Test video 02
SHEET 03/06Machine Elements ProjectREV A

E-Bike Gearbox Design Report

Academic Engineering Project · Mechanical Design, Gear Analysis & CADApr 2025 – Aug 2025

Group capstone for MECH 3409 (Machine Elements Design): a two-stage spur gearbox engineered to step down a 700 rpm, 10 N·m e-bike motor to hit a 30 km/h top speed. Weighed a planetary layout against a simple spur design and selected spur gearing for its simplicity, serviceability, and cost — then carried it through AGMA bending/contact analysis and FEA validation.

Designed a two-stage 2.4:1 spur-gear reduction with a calculated 58% reduction in output shaft speed, working to 10 N·m torque, 30 km/h vehicle speed, and under-8-kg requirements. Performed AGMA gear-tooth bending and contact-stress calculations and FEA, selected carbon steel for the gearing and shafts, specified an aluminum housing, and prepared drawings and a complete bill of materials.

Owned the introduction, performance requirements & constraints, and final design-requirements/conclusion sections, and edited the team's presentation video.

Design Notes
Gear ratio1:2.4 (25:60T)
Input torque10 N·m
Top speed30.2 km/h
Output speed−58%
Gears & shafts1045 carbon steel
HousingAluminum
AGMA SH1.21
Mass5.46 kg
Result: design met all performance requirements (10 year fatigue life, <8 kg, 30 km/h) with an AGMA safety factor of 1.21 on contact stress, validated against FEA showing peak stress at the tooth root well under the 530 MPa yield strength of 1045 steel.
SHEET 04/06Additional ProjectREV A

Floating Solar Sun-Tracking System

Team Design Project · Mechanical Design & Sensor IntegrationJan 2025 – Apr 2025

Designed floating mechanical structures supporting solar panels with dynamic sun-tracking capability, from hand-sketched concept through to a dimensioned CAD assembly.

  • —Modeled floating structures and panel supports in CAD for buoyancy, stability, and water exposure.
  • —Collaborated on integrating sensor-based sun tracking with mechanical actuation for adjustable panel orientation.
  • —Integrated sensor-based control (LDR, IMU, ultrasonic) for automated tracking.
Design Notes
SensorsLDR, IMU, US
ActuationDual servo
BuoyancyPontoon hull
DateJan – Apr 2025
Instrumentation Project

Autonomous Seeding Robot

MECH 2502 Instrumentation & Measurement Techniques · Team ProjectWinter 2024

Built a two-layer autonomous robot that plants and waters seeds for reforestation and erosion control. The lower layer holds the mechanical systems: three seed containers dispensed by a stepper-driven rotary feeder, plus a water tank, pump and flow sensor. The upper layer keeps the breadboard and DAQs away from water.

  • —Used a Hall-effect water flow sensor to meter the right amount of water for each seed type, and a colour sensor to identify seeds.
  • —Controlled seed spacing with an encoder-equipped DC motor driven through a MOSFET.
  • —Collected sensor data with USB-6001 and Quanser Q8-USB DAQs and processed it in a LabVIEW VI.

Watch the project video →

Design Notes
Chassis1′ × 1.5′, two layers
SensorsWater flow, colour
ActuationStepper, DC motor
DAQUSB-6001, Q8-USB
SoftwareLabVIEW
SHEET 05/06Maker ProjectsREV A

Arduino IDE Go-Kart

Ground-up RC go-kart build: designed the chassis, gearbox, and drivetrain in CAD, generated a full bill of materials, then wired and programmed the electronics on breadboard for functional testing.Jun 2025

Elastic Powered Go-Kart

Miniature 3D-printed car powered entirely by a wound elastic band — no motor. Iterated from a skeletal frame concept to an aerodynamic printed body, designing the gear train that stores and releases elastic energy.May 2025

SHEET 06/06Skills — Parts ListREV A
No.CategorySpecification
01Mechanical Design & AnalysisSolidWorks, AutoCAD, Fusion 360, STAR‑CCM+, FEA, CFD, GD&T, DFM, BOMs
02Controls & PrototypingMATLAB, Python, Arduino, LabVIEW, 3D printing, mechatronics, electromechanical integration
03Operations & MethodsRoot cause analysis, IATA/TDG, Microsoft Excel, UKG/FAMIS, safety and quality compliance