• 소성∙가공
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• 제30권4호
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• pp.172-178
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• 2021

The cold forging process induces material deformation in an enclosed space, generating a very high forging load. Therefore, it is mainly designed as a multi-stage process, and fatigue failure occurs in forging die due to cyclic load. Studies have been conducted previously to quantitatively predict the fatigue limit of cold forging dies, however, there was a limit to field application due to the large error range and the need for expert intervention. To solve this problem, we conducted a study on the introduction of a real-time forging load measurement technology and an automated system for quantitative prediction of die life cycle. As a result, it was possible to reduce the error range of the quantitative prediction of die life cycle to within ±7%, and it became possible to use the die life cycle calculation algorithm into an automated system.

• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2023년도 가을학술발표대회논문집
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• pp.165-166
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• 2023

Construction inspection and monitoring are key activities in construction projects. Automation of inspection tasks improves the limitations and inefficiencies of manual construction inspections, enabling systematic and consistent construction inspections. In this paper, an RTSP (Real-Time Streaming Protocol) system is used to remotely manage and supervise the construction site without having to visit the construction site by deploying a robot on site on behalf of four construction stakeholders (owner, supervisor, constructor, and designer). I would like to propose. The proposed system can contribute to identifying and monitoring the process process and work results at the construction site in real time.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2005년도 ICCAS
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• pp.1836-1839
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• 2005

We have developed Ethernet based real-time communication systems called "Vnet/IP" for DCS which is the control system for process automation. This paper describes the features and the technologies of the ASIC which is utilized in the communication interface hardware for Vnet/IP. Vnet/IP has been developed for mission-critical communications. Hence it has real-time feature, high reliability and precise time synchronization capability. At the same time, it is able to deal with standard protocols without influence on mission-critical communications. The communication interface hardware has a host interface and dual redundant network interfaces. The host interface can be chosen PCI-bus or R-bus which is the proprietary internal bus developed for the high reliable redundant controller. Each network interface is a RJ45 connection with 1Gbps maximum in compliance with IEEE802.3.

• 산업경영시스템학회지
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• 제30권4호
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• pp.111-117
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• 2007

Comparing with bar-code systems, RFID systems can supply more efficient work. Using RFID systems, logistic management systems could be helped effectively to gather real-time information. It's available to reduce the working time and object's delay time, and to deal with real-time information by using RFID system. Until now, based on how many pallets used, there is few study about best workload of RFID system. Therefore, in this study, both bar-code and RFID system simulations were executed for inspection process in distribution center. As a result, following the ware pallet quantity, the total cost of both working time and other delay times were calculated and the sensitivity analysis of total cost trend was executed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2004년도 학술대회 논문집 정보 및 제어부문
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• pp.156-158
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• 2004

Film printing companies have many problems during a printing process. Most of all, even an insect or dirt stick to the transparent film may cause severe errors until the end of printing job, which means big economic damage to the company. To prevent some insect-dots or dirt-dots, we have to Inspect the total area of film. However, it is very difficult to inspect the film in real-time due to the high-speed of printing that usually more than 150 m/min. A hardware based approach, for example DSP-based approach can be the one of solution candidates, but the total cost and the complexity increases the very high-level. In this paper, we suggest a software based approach, using MMX technology, to inspect the film in real-time. By Many real-plant experiments, we can see the suggest approach is applicable for the inspection of food packaging film in real-time.

• 한국방송∙미디어공학회:학술대회논문집
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• 한국방송공학회 1999년도 KOBA 방송기술 워크샵 KOBA Broadcasting Technology Workshop
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• pp.125-131
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• 1999

In this paper, we address practical methods for calculating camera lens distortion for real time applications. Although the lens distortion problem can be easily ignored for constant-parameter lenses, in the field of real-time camera calibrations, for zoom lenses a large number of calculations are needed to calculate the distortion. However, if the distortion can be calculated independently of the other camera parameter, we can easily calibrate a camera without the need for a large number of calculations. Based on Tsai's camera model, we propose two different methods for calculating lens distortion. These methods are so simple and require so few calculations that the lens distortion can be rapidly calculated even in real-time applications. The first method is to refer to the focal length - lens distortion Look Up Table(LUT), which is constructed in the initialization process. The second method is to use the relationship between the feature points found in the image. Experiments were carried out for both methods, results of which show that the proposed methods are favorably comparable in performance with non-real full optimization method.

• 한국인터넷방송통신학회논문지
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• 제19권6호
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• pp.79-85
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• 2019

최근 소형 레이더는 한번의 타격으로 표적의 시스템을 무능화시키기 위해 높은 거리해상도를 갖는 소형 밀리미터파 레이더 개발을 요구한다. 높은 거리해상도를 갖는 소형 밀리미터파 레이더가 표적을 획득하고, 추적하기 위해서는 대용량의 데이터를 실시간으로 처리해야한다. 본 논문에서는 소형 밀리미터파 레이더에서 요구하는 대용량의 데이터를 실시간으로 처리하기 위한 실시간 데이터 전처리 방법을 정리하였다. 또한 실시간 데이터 전처리 방법으로 제시한 디지털 IF(Intermediate Frequency) 수신기, Window처리, DFT(Discrete Fourier Transform)를 FPGA (Field Programmable Gate Array)를 활용하여 구현하였다. 마지막으로 구현한 실시간 데이터 전처리 모듈은 소형 밀리미터파 레이더를 위한 신호처리기에 적용하여 실시간 데이터 전처리 기능과 관련된 성능시험으로 검증하였다.

• 한국컴퓨터정보학회논문지
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• 제28권12호
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• pp.89-96
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• 2023

본 논문에서는 GPU기반으로 옷감을 찢는 데 필요한 동적 재메싱를 실시간으로 처리할 수 있는 방법을 제안한다. 얇은 쉘 재질은 물리 기반 시뮬레이션/애니메이션, 게임, 가상현실 등 다양한 분야에서 활용되고 있다. 옷감을 찢는 것은 기하학과 연결 구조를 동적으로 갱신해야 되기 때문에 그 처리 과정이 복잡하고 계산양이 크다. 특히 인터랙티브 콘텐츠를 다루는 분야에서는 이 과정이 빠르게 수행되어야 한다. 대부분의 방법에서는 실시간을 유지하기 위해 저해상도 시뮬레이션을 통해 재메싱을 수행하거나 이미 분할된 패턴을 그대로 이용하기 때문에 동적 재메싱이라고 보기 어려우며, 찢어진 패턴의 품질이 낮다. 본 논문에서는 GPU에 최적화된 동적 재메싱 알고리즘을 새롭게 제안함으로써 고해상도 옷감 찢어짐을 실시간으로 처리할 수 있게 한다. 본 논문에서 제안하는 방법은 사전에 쪼개진 메쉬 형태가 아닌 동적 재메싱이 가능하기 때문에 가상 수술시뮬레이션이나, 실시간을 요구하는 게임 및 가상환경에서 물리 기반 모델링울 할 때 활용될 수 있다.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제21권4호
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• pp.315-319
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• 2015

본 논문은 실시간 정밀 모션 제어를 위한 안드로이드 응용의 설계와 구현을 다룬다. 안정적인 실시간 성능을 제공하기 위해서 다축 모터들이 특정 모션을 만들어낼 수 있도록 실시간 필드버스에 주기적으로 좌표 벡터 명령을 전달하고 그에 대한 피드백을 받는 모션 제어부를 데몬 프로세스 형태의 안드로이드 서비스로 구현하고, 이 모션 제어 서비스에 모션의 좌표 벡터들을 생성하여 전달하는 모션 계획부를 안드로이드 UI 응용으로 구현하였다. 이러한 소프트웨어 구성을 지원하기 위해서 멀티코어 프로세서를 모션 제어 서비스의 실행을 전담하는 실시간 코어들과 UI 응용의 실행을 전담하는 비실시간 코어로 나누었으며, 모션 제어 서비스와 응용 사이의 통신을 공유 메모리 형태로 구현하였다. 성능 측정 결과, 8축 모터들을 2개씩 그룹지어 4개의 쓰레드로 제어하는 경우에도 태스크 활성화 지터의 99%를 ${\pm}55{\mu}s$ 미만으로 유지하면서, 모션 제어 주기를 2ms까지 달성할 수 있었다.

• Journal of Welding and Joining
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• 제16권5호
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• pp.76-85
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• 1998

The resistance spot welding process has been used for joining the sheet metal in automotive engineering. In the resistance spot welding, the weld quality is very important, because the quality of weld is one of the most important factors to the automobile quality. The size of he molten nugget has been utilized to estimate the weld quality. However, it is not easy to find the weld defects. For weldability estimation, we have to use the nondestructive method such as X-ray or ultrasonic inspection. But these kinds of approaches are not suitable for detecting the defects in real time. The purpose of this study is to develop the real time monitoring of the weld quality in the resistance spot welding. Obtained data were used to estimate weldability using fuzzy algorithm. It is sound that this monitoring and estimation system can be useful to improve the weld quality in the resistance spot welding process and it is possible to estimate the weldability in real time.