Terminal Operation Log Analysis for Accurate Work Hour Calculation

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Solution Overview

Problem

Existing systems fail to accurately determine working hours when a worker finishes their work without performing a logoff operation, leading to inaccuracies in time tracking.

Innovation Solution

A work management device that acquires operation logs and specifies non-operation periods to calculate working hours, including a non-operation period in the calculation based on its duration, and uses noise filtering to exclude irrelevant operations.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If login and logoff operations are detected to manage working hours, then the system can track working hours using explicit user actions, but the accuracy deteriorates when workers finish work without performing logoff operations

Engineering Contradiction:

Improveworking hours accuracyVSAvoidoperation requirement

Core Design Contradiction:

Measurement precisionVSEase of operation

Solution Approach 1:

The system automatically detects working hours by analyzing terminal operation histories without requiring users to perform logoff operations. The working hours management device self-services by autonomously identifying non-operation periods from operation logs, eliminating the need for manual logoff actions while maintaining accurate time tracking

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The system continuously collects and stores operation histories during work periods, preparing data in advance that can be automatically analyzed to determine working hours. By preliminarily gathering operation data, the system can accurately calculate working hours even when logoff operations are not performed

Inventive Principle:

Principle #10Preliminary action

2Measurement precision

If the system continuously monitors operation history to accurately determine working hours, then measurement precision improves, but device complexity increases

Engineering Contradiction:

Improveworking hours detection accuracyVSAvoidsystem complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The working hours management device acts as an intermediary between the terminal system and the working hours calculation. It receives operation histories from terminals, automatically analyzes non-operation periods, and determines working hours. This intermediary approach simplifies the overall system by centralizing the analysis function rather than requiring complex modifications to existing terminal systems

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The system extracts only the necessary operation history data related to working hours from terminal records. By selectively extracting relevant operation data and non-operation periods, the system avoids processing unnecessary information, thereby reducing computational complexity while maintaining accurate working hours detection

Inventive Principle:

Principle #2Taking out (Extraction)

Data Source

PatentUS12572897B2Work management device, work management method, and recording medium

Publication Date: 2026.03.10 NEC CORP

AI summary

Provided is a work management device including an acquisition unit that acquires information indicating login to a system using a first terminal and an operation history of the first terminal occurring after login to the system, a specifying unit that specifies a non-operation period of a terminal from the operation history of the first terminal, and a calculation unit that calculates working hours including the non-operation period of the terminal according to a length of the non-operation period of the terminal.