• Transactions on Control, Automation and Systems Engineering
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• 제4권4호
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• pp.319-323
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• 2002

In this paper, we consider the track-following control problem in the optical data storage systems in the presence of the eccentricity. The eccentricity results in the radial deviation of the objective lens so that it degrades the reliability of the data decoding system. To cope with the eccentricity, an adaptive disturbance compensation technique is newly proposed in the time domain based on a disturbance observer of reduced order, which effectively estimates the low frequency components of the disturbance. The proposed compensator is simply added to the conventional feedback control. The error dynamics of the observer and the sensitivity analysis are given to illustrate the effectiveness of the proposed approach. Finally, through experiments in an optical storage system, the feasibility of the proposed approach is verified.

• 센서학회지
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• 제27권5호
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• pp.352-356
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• 2018

This paper relates to a technology for monitoring a liquefied gas storage tank in the special gas field where demand is increasing owing to the continuous growth of related fields such as the semiconductor, display, and ICT convergence electronics industries. We have proposed a system for real - time monitoring using wireless sensor network technology, and implemented a system consisting of a sensor unit, transmitter module, and receiver module to be attached to a liquefied gas storage tank. The system was applied to LCO2 tanks among various liquefied gas storage tanks to verify the feasibility. The storage tanks employed in the experiments has capacities of 16,179 l and was 1,920 mm in inner diameter. Furthermore, the density was 1.03 g/l. The measured data were compared with reference data on the remaining gas level versus the $CO_2$ height of the surface, expressed using a conventional water meter, provided by an existing storage tank supplier. The experimental results show that the data is similar to the standard data provided by the tank supplier, and has a high accuracy and reliability within an error range of 0.03%.

• 한국에너지공학회:학술대회논문집
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• 한국에너지공학회 2010년도 춘계학술 발표회
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• pp.104-107
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• 2010

• 대한안전경영과학회지
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• 제16권2호
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• pp.139-146
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• 2014

In Korea's distribution and production field establishment of logistics information system and automation of logistics were greatly developed. But there is no characteristic and professionalism about hospital logistics, and distribution center is located in outside warehouse, logistics system is very important. Since hospital has human power to receive product, system is not as much required, but outside warehouse requires system for arrival from medicine and medical supplies wholesale dealer and vender, warehousing, storage, and automation facilities, and system for various works such as peaking instruction, classification, packing, cargo-working, delivery, order of medicine from hospital and non-medicine in hospital is essential. Therefore, This study is about development of automatic identification of slide which cannot be overlooked in efficiency of hospital logistics, establishment of database, and information interlocking between automatic storage system and outside warehouse.

• Journal of Electrical Engineering and Technology
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• 제13권2호
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• pp.989-997
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• 2018

Massive event stream brings us great challenges in its volume, velocity, variety, value and veracity. Picking up some valuable information from it often faces with long detection time, high memory consumption and low detection efficiency. Aiming to solve the problems above, an efficient complex event detection method based on NFA_HTS (Nondeterministic Finite Automaton_Hash Table Structure) is proposed in this paper. The achievement of this paper lies that we successfully use NFA_HTS to realize the detection of complex event from massive RFID event stream. Specially, in our scheme, after using NFA to capture the related RFID primitive events, we use HTS to store and process the large matched results, as a result, our scheme can effectively solve the problems above existed in current methods by reducing lots of search, storage and computation operations on the basis of taking advantage of the quick classification and storage technologies of hash table structure. The simulation results show that our proposed NFA_HTS scheme in this paper outperforms some general processing methods in reducing detection time, lowering memory consumption and improving event throughput.

• 통상정보연구
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• 제15권2호
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• pp.411-428
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• 2013

본 논문은 UPnP(Universal Plug and Play) 네트워크 기술을 활용한 전자무역의 창고관리시스템 고도화 추진전략을 수립하기 위해 기본 원칙인 창고의 종합물류 네트워크 단일화서비스, 입 출고 자동화업무 등을 실무적인 관점에서 방향을 제시하였다. 전자무역에서 새롭게 부각되고 있는 UPnP 네트워크를 활용한 창고관리시스템의 송수신 네트워크 기술은 향후 물류/유통의 새로운 패러다임으로 변화할 것이다. 이러한 시대적 요구사항을 즉각적으로 반영하고 성공적인 창고의 종합물류 단일화서비스 개발을 위해서는 본 연구에서 제시한 내용들을 체계적으로 적절하게 수행해야 하고, 새로운 변화에 필연적으로 대응하는 자세의 전환이 중요하다. 본 논문은, UPnP 네트워크 활용의 창고관리시스템의 기술적인 방향을 제시하기 보다는 실무적 관점에서 살펴보고, 향후 해석적 기초를 제시하는데 그 목적이 있다.

• 산업공학
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• 제11권1호
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• pp.131-143
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• 1998

Automated Storage/Retrieval Systems(AS/RS) are widely utilized to increase the efficiency of logistics system. In this paper, to offer the basic data required for the standardization and automation of AS/RS, we look into the conditions of several domestic AS/RS manufacturing companies and examine the national and international market conditions and the technical levels of domestic companies. And also, for the domestic companies, government departments and logistics related organizations, we survey and analyze the present state for the installation, implementation and operation of AS/RS and the related equipment systems, and the degree of recognition for the relational aspects.

• 스마트미디어저널
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• 제7권4호
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• pp.9-16
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• 2018

클라우드 컴퓨팅(Cloud Computing)의 경제성과 유연성을 향상시키기 위해 복잡해지는 자원의 운영 및 관리를 자동화하는 추세에 있다. 그러나 클라우드 스토리지에 대한 자동화는 제조업체의 스토리지 하드웨어에 종속되나, 사용자가 필요로 하는 용도에 맞추어 스토리지 유형을 유연하게 지원할 수 없다. 본 논문에서는 클라우드 스토리지의 자동화 추세에 맞추어 사용자의 환경에 연계한 블록/파일/객체 스토리지를 통합으로 지원하는 자동 설정 모듈을 제안한다. 제안방법은 클라우드 스토리지인 ceph을 자동으로 설치하기 위하여 Chef 구성관리도구 기반의 자동설치 및 설정 모듈을 제안하였으며, 사용자들이 ceph 스토리지를 쉽게 사용할 수 있도록 쉘 프로그램 기반의 블록/파일/객체 스토리지 자동설정 모듈을 제안하였다. 제안방법은 하드웨어 종속 없이 가상이나 물리적인 사용자 환경에서도 자동적으로 공유파일 스토리지, 블록 스토리지, 객체 스토리지에 대한 설정 및 관리를 쉽게 할 수 있다.

• 스마트미디어저널
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• 제10권1호
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• pp.99-107
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• 2021

4차 산업혁명, Industry 4.0 과 더불어 최근 ICT 분야의 메가트렌드는 빅데이터, IoT, 클라우드 컴퓨팅, 그리고 인공지능이라고 할 수 있다. 따라서, 4차 산업혁명 시대에 알맞은 AI 서비스들의 기술 개발과 다양한 산업 영역에서 ICT 분야의 융합에 따른 BI (Business Intelligence), IA (Intelligent Analytics, BI + AI), AIoT (Artificial Intelligence of Things), AIOPS (Artificial Intelligence for IT Operations), RPA 2.0 (Robotic Process Automation + AI) 등의 세분화된 기술 발전으로 급속한 디지털 전환 (Digital Transformation)이 진행되고 있는 추세이다. 본 연구에서는 이러한 기술적 상황에 따른 대용량 분산 Abyss 스토리지 기반으로 인프라 측면의 GPU, CDA (Connected Data Architecture) 프레임워크, 그리고 AI의 다양한 머신러닝 서비스들을 통합 및 고도화를 목표로 하며, AI 비즈니스의 수익 모델을 다양한 산업 영역에 활용하고자 한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권7호
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• pp.3690-3713
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• 2019

According to the main group key management schemes logical key hierarchy (LKH), exclusion basis systems (EBS) and other group key schemes are limited in network structure, collusion attack, high energy consumption, and the single point of failure, this paper presents a group key management scheme for wireless sensor networks based on Lagrange interpolation polynomial characteristic (AGKMS). That Chinese remainder theorem is turned into a Lagrange interpolation polynomial based on the function property of Chinese remainder theorem firstly. And then the base station (BS) generates a Lagrange interpolation polynomial function f(x) and turns it to be a mix-function f(x)' based on the key information m(i) of node i. In the end, node i can obtain the group key K by receiving the message f(m(i))' from the cluster head node j. The analysis results of safety performance show that AGKMS has good network security, key independence, anti-capture, low storage cost, low computation cost, and good scalability.