• Journal of the Korea Society for Simulation
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• v.33 no.2
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• pp.1-11
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• 2024

A cyber-physical system is a technology that connects the physical systems of a manufacturing environment with a cyber space to enable simulation. One of the major challenges in this technology is the seamless communication between these two environments. In complex manufacturing processes, it is crucial to adapt to various protocols of manufacturing equipment and ensure the transmission and reception of a large volume of data without delays or errors. In this study, we propose a method for constructing agent models for real-time simulation-capable cyberphysical systems. To achieve this, we design data collection units as independent agent models and effectively integrate them with existing simulation tools to develop the overall system architecture. To validate the proposed structure and ensure reliability, we conducted empirical testing by integrating various equipment from a real-world smart microfactory system to assess the data collection capabilities. The experiments involved testing data delay and data gaps related to data collection cycles. As a result, the proposed approach demonstrates flexibility by enabling the application of various internal data collection methods and accommodating different data formats and communication protocols for various equipment with relatively low communication delays. Consequently, it is expected that this approach will promote innovation in the manufacturing industry, enhance production line efficiency, and contribute to cost savings in maintenance.

• ETRI Journal
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• v.40 no.4
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• pp.421-434
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• 2018

The application of deep neural networks (DNNs) to connect the world with cyber physical systems (CPSs) has attracted much attention. However, DNNs require a large amount of memory and computational cost, which hinders their use in the relatively low-end smart devices that are widely used in CPSs. In this paper, we aim to determine whether DNNs can be efficiently deployed and operated in low-end smart devices. To do this, we develop a method to reduce the memory requirement of DNNs and increase the inference speed, while maintaining the performance (for example, accuracy) close to the original level. The parameters of DNNs are decomposed using a hybrid of canonical polyadic-singular value decomposition, approximated using a tensor power method, and fine-tuned by performing iterative one-shot hybrid fine-tuning to recover from a decreased accuracy. In this study, we evaluate our method on frequently used networks. We also present results from extensive experiments on the effects of several fine-tuning methods, the importance of iterative fine-tuning, and decomposition techniques. We demonstrate the effectiveness of the proposed method by deploying compressed networks in smartphones.

• Proceedings of the Korea Information Processing Society Conference
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• 2013.05a
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• pp.869-870
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• 2013

Once upon a time people dreamt for a connected world. But most of the people consider dream as simple as a dream. But when this dream come into reality, the dreamer sometimes alive and sometimes not. But the later generations get outcome from the visionary dream of the former. This is the way of life. If we consider the whole world as a cyber physical system, if everything connects everything, how do we feel then? It is the smart Internet of things that may connect the whole world. This paper addresses few challenges and opportunities of this envisioned connected World. We identify different systems as cyber physical system and it ultimately contribute to the cloud infrastructure.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.305-307
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• 2023

현재 제조업에서 설비 라인 증축 및 최적화를 위해서는 공정 분석과 설비 시스템 테스트가 요구되며, 많은 시간과 비용이 소요된다. 이러한 문제를 해결하기 위해, 가상의 설비모델을 이용해 설비검증과 라인 테스트를 수행할 수 있는 다양한 CPS(Cyber Physical System)가 연구되고 있다. 본 논문에서는 다양한 설비 이해관계자 사이의 상호운용성을 확보하기 위해 독일의 Industry 4.0에서 제안한 표준 설비 명세인 AAS(Asset Administration Shell)를 활용한 CPS 구현을 제안한다. SMT(Surface Mounting Technology) 라인 중 Screen Printer를 대상으로, 총 3개의 서브 모델(Sub model)과 17개의 속성(Property)을 AAS 명세하고 이를 이용한 CPS를 구현하는 사례연구를 수행했다. 제안 방법은 표준명세를 활용한 제조 분야 CPS 구현에 적용될 수 있다.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.20 no.2
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• pp.227-234
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• 2020

This paper introduces the state definition and diagnostic algorithm for autonomic control of manufacturing facilities. Smart factory systems through cyber-physical systems and digital twin technology are increasing the productivity and stability of existing manufacturing plants, which has become an issue recently. A Smart factory system is one of the key technologies that make up a smart factory system, to improve productivity, enable workers to make better decisions, and to control abnormal process flows. However, performing an autonomic control process based on large number of integrated plat data requires significant advance work. Therefore, in this paper, we define an abstracted facility state for manufacturing facility autonomic control and propose an algorithm to diagnose the current state. This makes the autonomic control process simpler by autonomic control based on the facility status rather then integrated facility data.

• Information and Communications Magazine
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• v.33 no.11
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• pp.8-15
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• 2016

본고에서는 최근 전 세계적인 화두로 떠오르고 있는 '제 4차 산업혁명'에 대해 살펴보고, 우리나라가 타국가 대비 경쟁우위에 있는 최첨단의 정보통신기술(ICT)을 활용하여 제조업 혁신을 선도하기 위한 방안에 대해 알아본다. 특히 국가 경제에 커다란 비중을 차지하고 있는 제조분야의 새로운 패러다임에 대응하고 선진국형 제조 산업 육성을 위해 CPS(Cyber-Physical Systems, 사물지능제어(事物知能制御)시스템)기술에 기반한 스마트팩토리 구현 기술을 제시하고자 한다.

• Information and Communications Magazine
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• v.31 no.8
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• pp.38-44
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• 2014

급격한 인구증가와 도시집중으로 인해 발생되는 에너지, 교통 및 안전문제를 해결하려는 노력의 일환으로 스마트시티 개발 사례가 폭발적으로 증가하고 있다. 스마트시티를 위한 표준화된 기술의 개발과 도입은 매우 중요한 이슈가 되었다. 특히, 미래의 도시를 구성하는 수많은 기능과 설비는 대규모성, 지능성 및 자율성을 가지는 네트워크기반 분산형 SW에 의해 통제되고 운영될 것으로 전망되는 바 이를 효과적으로 지원할 수 있는 대규모 자율제어 CPS(Cyber-Physical Systems) SW 플랫폼에 대한 현재 연구 내용을 고찰하고, 미래 스마트시티 적용 방안을 논의한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2009.11a
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• pp.185-186
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• 2009

오늘날 분산 컴퓨팅 환경은 유비쿼터스 컴퓨팅 기술을 요구하고 있다. 미국의 경우 최근 몇 년간 CPS에 대한 개념을 도입하여 차세대 임베디드 산업에 대한 새로운 패러다임을 제시하였고, 유비쿼터스 기술은 CPS 기술의 형태로 변화되기 시작하였다. 여기에 더해 실시간의 컴퓨팅 관리와 사용을 위해 자율 컴퓨팅 기술이 필요하며 기존과 달리 CPS 형 자율 컴퓨팅이 요구되고 있다. 본 논문은 기존의 분산 컴퓨팅과 CPS 컴퓨팅에서의 자율 컴퓨팅 요구를 소개하였다. 따라서 CPS 환경을 위해 주목해야 할 요소 기술들을 정리하였다.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.8
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• pp.357-368
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• 2013

Our society has evolved into a fully connected society in a mixed reality environment enabling various knowledge sharing / management / control / creation due to the expansion of broadband ICT infrastructure, smart devices, cloud services and social media services. Therefore cyber threats have increased with the convenience. The society of the future can cause more complex and subtle problems, if you do not have an effective response to cyber threats, due to fusion of logical space and physical space, organic connection of the smart object and the universalization of fully connected society. In this paper, we propose the strategy to build knowledge-base as the basis to actively respond to new cyber threats caused by future various environmental changes and the universalization of fully connected society.

• Journal of Platform Technology
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• v.6 no.4
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• pp.78-86
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• 2018

In this paper, a VR-based cyber hiking system was designed to provide virtual reality for famous mountains that can offer the real senses and feelings of hiking in supporting environmental factors of actual mountains such as the temperature, air, sound, echoes, etc., of the mountain the user wants to climb. The VR-based cyber hiking system that reflects real-time site conditions is largely consisted of the data collection module that collects data from the live site, multiple drive modules that enables the user to feel real senses using data from the sites, and sensor module to detect the stimuli provided by the drive modules and the user's physical body transition. Unlike existing VR-based hiking systems, the proposed cyber hiking system not only provides simple virtual reality for the wanted mountain, but can also provide the natural conditions of real mountains and implement the uphill and downhill of hiking routes. In particular, it has the effect of providing fun and game elements to users by excluding unnecessary conditions and risks that may arise in actual hiking and instead supporting augmented realities such as squirrels on actual hiking paths. In addition, in providing users with the changes in their body before and after hiking, it is expected to be effective in providing diverse feedback such as the height, gradient, and speed of mountain hiking.