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Knowledge Base

Sharing the technical know-how and insights of DWK Partners. Check out deep articles from the latest IT trends to practical problem-solving.

How an IoT-Based Space Energy Management System Works: From Sensor Signals to the Electricity Bill
Energy Solutions
2026. 10. 12.Dongwan Kim

How an IoT-Based Space Energy Management System Works: From Sensor Signals to the Electricity Bill

Behind a screen where pressing a button turns on an air conditioner, state collection, command delivery, automation decisions and power data collection each travel along a different path. We walk through the architecture of B-Saver, the system we operate, one path at a time.

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In a Kiosk, Connect the Devices Before the Screens — Development Order and Design Criteria for Hardware-Integrated Systems
SI Practice
2026. 10. 05.Dongwan Kim

In a Kiosk, Connect the Devices Before the Screens — Development Order and Design Criteria for Hardware-Integrated Systems

We built three kiosks with identity verification equipment, a shredding unit and a payment terminal attached. This article covers how we ordered the development work, what we placed between the screens and the devices, and what we took into account for payments and remote operation.

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The Order for Cutting a Building's Electricity Bill — Savings Do Not Start Without Measurement
Energy Solutions
2026. 09. 15.Dongwan Kim

The Order for Cutting a Building's Electricity Bill — Savings Do Not Start Without Measurement

Sometimes the bill stays the same even after switching to LED lighting and raising the air conditioner setpoint. This article lays out the order to follow, starting with how the bill is calculated and then finding the savings points in the data.

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Why Is the Meeting Room Air Conditioner Still Running? — Designing Occupancy-Based Space Control
Energy Solutions
2026. 08. 18.Dongwan Kim

Why Is the Meeting Room Air Conditioner Still Running? — Designing Occupancy-Based Space Control

You add automatic lights-off, the lights go out in the middle of a meeting, and eventually someone switches the automation off. This happens again and again. Here is what you actually have to decide when designing space-level control.

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Operating IoT Systems Installed in the Field — Disconnections, State Mismatch, and Remote Management
Energy Solutions
2026. 07. 02.Dongwan Kim

Operating IoT Systems Installed in the Field — Disconnections, State Mismatch, and Remote Management

The demo works, but things change once the devices are installed on site. Connections drop, the state on screen drifts from the real device, and there is no way to update. This article covers the design work that the operations phase requires.

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What Takes Longer Than Development in a Kiosk Project — A Checklist for Building Unmanned Systems
SI Practice
2026. 05. 26.Dongwan Kim

What Takes Longer Than Development in a Kiosk Project — A Checklist for Building Unmanned Systems

A kiosk project is not about building screens. It ties hardware, regulation and field operations together. This article walks through, stage by stage, the points that actually eat up the schedule.

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Where External System Integrations Fail — Principles of Interface Design
SI Practice
2026. 04. 14.Dongwan Kim

Where External System Integrations Fail — Principles of Interface Design

Most integration failures happen at the boundary between systems, not in our own code. This article covers the design principles we use in practice, from defining the contract to failure handling, data consistency, and observability.

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Concurrency Design for Booking Systems: Where Double Bookings and Overbooking Come From
SI Practice
2026. 02. 27.Dongwan Kim

Concurrency Design for Booking Systems: Where Double Bookings and Overbooking Come From

The same room gets sold to two people not because the code is wrong, but because nobody decided when inventory is deducted. This article covers how to handle concurrency in a booking system.

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How Scope Grows in SI Projects and How to Design Change Management to Contain It
SI Practice
2026. 01. 15.Dongwan Kim

How Scope Grows in SI Projects and How to Design Change Management to Contain It

The scope agreed at contract signing keeps growing after kickoff. Most of the time nothing was added; what was vague to begin with simply became specific. This article explains how to tell the two apart.

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Designing a System That Meets Document Security Requirements: Access Control, Watermarks, and Audit Logs
SI Practice
2025. 11. 27.Dongwan Kim

Designing a System That Meets Document Security Requirements: Access Control, Watermarks, and Audit Logs

When the requirement is "make sure internal documents do not get out," what should you design first? This article lays out a realistic approach that starts from the premise that complete prevention is impossible.

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Where Things Break When You Add AI Features to an Existing Business System
SI Practice
2025. 10. 09.Dongwan Kim

Where Things Break When You Add AI Features to an Existing Business System

The demo goes well, but things change once the feature is in real work. Responses are slow, costs are hard to predict, and there is no path for handling wrong answers. Here is what to decide before adoption.

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Where Mobile App Projects Differ from Web — Review, Release, and Version Management
SI Practice
2025. 08. 21.Dongwan Kim

Where Mobile App Projects Differ from Web — Review, Release, and Version Management

On the web, a fix is live the moment you make it. Apps are different. They have to pass review, some users stay on old versions, and rolling back is hard. This article covers the differences you need to build into your schedule and design.

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Legacy Data Migration — What to Check Before You Move Anything
SI Practice
2025. 06. 12.Dongwan Kim

Legacy Data Migration — What to Check Before You Move Anything

Estimating a data migration from row counts alone is almost always wrong. Once you open the real data, exceptions that were never documented come pouring out. This article lays out the order in which to set the migration scope and validate the result.

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The Point Where Notifications Start Getting Ignored — Designing a Delivery System
SI Practice
2025. 03. 20.Dongwan Kim

The Point Where Notifications Start Getting Ignored — Designing a Delivery System

The more notifications you send, the less each one works. Once a user turns notifications off, they do not come back on. This article covers how to decide what to send, when, and through which channel, and how to structure a system that keeps delivery under control.

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