• Title, Summary, Keyword: FTC

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Observer-Based Robust Fault Diagnosis and Reconfigurable Adaptive Control for Systems with Unknown Inputs (미지입력을 포함한 시스템의 관측기 기반 견실고장진단 및 재구성 적응제어)

  • 최재원;이승우;서영수
    • Journal of Institute of Control, Robotics and Systems
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    • v.8 no.11
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    • pp.928-934
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    • 2002
  • A natural way to cope with fault tolerant control (FTC) problems is to modify the control parameters according to an online identification of the system parameters when a fault occurs. However. due to not only difficulties Inherent to the online multivariable identification in closed-loop systems, such as modeling errors, noise or the lack of excitation signals, but also long time requirement to identify the post-fault system and implemeutation of control problems during the identification process, we propose an alternative approach based on the observer-based fault detection and isolation (FDI) and model reference adaptive control (MRAC). The proposed robust fault diagnosis method is based on a bank of observers. We also propose a model reference adaptive control with changeable reference models according to the occurred faults. Simulation results of a flight control example show the validity and applicability of the proposed algorithms.

A Study on the Development of a Boiler Control System Simulator for Evaluation of the Fault Tolerant Control System (FTCS의 성능시험을 \ulcorner나 보일러 제어시스템 시뮬레이터의 개발에 관한 연구)

  • ;;;Zeungnam Bien
    • The Transactions of the Korean Institute of Electrical Engineers
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    • v.37 no.11
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    • pp.786-795
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    • 1988
  • In this paper a boiler control system simulator is designed and inplemeted in order to evaluate performance of the Fault Tolerant Control System. It simulates a boiler control system of a thermal power plant containtng boiler process, peripheral units and analog controller. The simulator uses a low order linear model for boiler first order models for the peripheral unit. Specifically the model of the analog controller is modularized and transformed to digital form if order to be implemented using a micro-processor board. The experimental results show the usability of the developed simulator for the performance test of the FTCS.

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Antioxidant effects of the Root of Vitis labrusca Water and Aqua-acupuncture Solution (포도근 열수 추출액 및 약침액이 항산화에 미치는 효과)

  • Lim Seong-Cheorl;Moon Jin-Young
    • Journal of Physiology & Pathology in Korean Medicine
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    • v.20 no.1
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    • pp.76-82
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    • 2006
  • This study was purposed to investigated the antioxidant effects of water (VLWS) and aqua-acupuncture solution (VLAS) from root of Vitis labrusca. VLWS and VLAS was were assessed to determine the mechanisms of its antioxidant activities. The VLWS and VLAS exhibitde a concentration-dependent inhibition of DPPH free radicals. This VLWS-mediated antioxidant activity was similar to that L-ascorbic acid (vitamin C). In addition, the VLWS and VLAS showed dose-dependent free radical scavenging activity, including superoxide anions and hydroxyl radicals, using different assay systems. The VLWS and VLAS were also found to be strongly inhibited linoleic acid oxidation in a ferric thiocyanate assay (FTC) system. Finally, the VLWS and VLAS significantly prevented Fenton's reagent-induced DNA nicking.

A Study on the Extension of the Extraterritorial Application of U.S. Antitrust Law and Our Corresponding Strategies (미국(美國) 반(反) 트러스트법(法)의 역외적용확대(域外適用擴大)와 그 대응방안(對應方案))

  • Bae, Jung-Han
    • The Korean Research Institute of International Commerce and Law
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    • v.12
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    • pp.555-586
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    • 1999
  • United States has extended the extraterritorial application of U.S. Antitrust Law in 1990s. First, The U.S. Federal Supreme Court declared in Hartford Fire Insurance Co. v. California that the extraterritorial application of U.S. Antitrust Law is according to Effect Doctrine. Therefore, U.S. Antirust Division and FTC will continue to base their assertions of juridiction on the test of direct, substantial and foreseeable effects on U.S. interests. Second, U.S. Antitrust Law apply to foreign conduct that such conduct has direct, substantial and reasonably foreseeable effect on U.S. domestic or import commerce and export commerce. Third, United States has extended the extraterritorial application of U.S. Antitrust Law on international licensing contract or international merger. Forth, United States impose criminal responsbility of U.S. Antitrust Law on the foreign anticompetitive conduct. Therefore, our government and industries must consider the corresponding stratigies against the extension of the extraterritorial application of U.S. Antitrust Law.

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개인정보 DB 관리기술의 보안 요구사항 연구

  • Choi, Hyang-Chang;Kim, Hyun;Park, Hae-Ryong;Chun, Kil-Soo;Lee, Hyung-Hyo
    • Review of KIISC
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    • v.18 no.2
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    • pp.76-86
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    • 2008
  • 인터넷을 통한 공공 및 민간 부분 서비스 제공이 활성화됨에 따라 이들 서비스를 제공받기 위해 사용자들은 자신의 개인정보를 서비스 제공자에게 제공하게 되고, 서비스 제공자들은 가입자들의 개인정보를 관리하기 위해 일반적으로 데이터베이스를 이용하고 있다. 최근 개인정보에 대한 중요도와 필요성이 증가함에 따라 정보보호 제품에 대해 일반 보안기능 및 신뢰성 평가뿐만 아니라 개인정보 소유자의 프라이버시가 보장되는지를 평가할 수 있는 평가기준 마련 필요성이 제기되고 있다. 본 논문에서는 OECD, 미국 FTC, 유럽연합 등 정보보호 선진국에서 제정한 프라이버시 보호원칙과 기존 DBMS 보안 요구사항을 함께 반영한 개인정보 DB 관리기술에 대한 보안 요구사항을 개발하였다. 개발된 보안 요구사항은 TTA 개인정보 생명주기 관리모델(안)의 생명주기 단계를 기준으로 각 생명주기 단계에서 수행되는 기능 특성에 따라DBMS 보안측면과 프라이버시 보호 측면을 함께 고려하여 작성되었다.

Finite-Time Convergent Guidance Law Based on Second-Order Sliding Mode Control Theory

  • Ji, Yi;Lin, Defu;Wang, Wei;Lin, Shiyao
    • International Journal of Aeronautical and Space Sciences
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    • v.18 no.4
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    • pp.697-708
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    • 2017
  • The complex battlefield environment makes it difficult to intercept maneuvering targets for guided missiles. In this paper, a finite-time convergent (FTC) guidance law based on the second-order sliding mode (SOSM) control theory is proposed to achieve the requirements of stability, accuracy and robustness. More specifically, a second-order sliding mode observer (SMOB) is used to estimate and compensate for the total disturbance of the controlled system, while the target acceleration is extracted from the line-of-sight (LOS) angle measurement. The proposed guidance law can drive the LOS angular rate converge to zero in a finite time, which means that the missile will accurately intercept the target. Numerical simulations with some comparisons are performed to demonstrate the superiority of the proposed guidance law.

New Record of Two Marine Ciliates (Ciliophora: Spirotrichea) in South Korea

  • Kim, Kang-San;Jung, Jae-Ho;Min, Gi-Sik
    • Animal Systematics, Evolution and Diversity
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    • v.29 no.2
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    • pp.144-151
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    • 2013
  • Two marine hypotrichous ciliates, Anteholosticha petzi and Ponturostyla enigmatica, were collected from the Yellow Sea and the Korea Strait, respectively, and described using live observation and protargol-impregnated specimens. Furthermore, the nuclear small subunit ribosomal RNA gene of each was sequenced and compared to previously annotated sequences retrieved from the GenBank. Anteholosticha petzi is characterized by 3 frontal cirri (FC), 2 frontoterminal cirri (FTC), 8-12 transverse cirri (TC), 1 buccal cirrus (BC), 9-12 midventral pairs (MP), 3 bipolar dorsal kineties (DK), and 3 types of colorless cortical granules. Ponturostyla enigmatica is characterized by 8 FC, 5 ventral cirri (VC), 5-7 TC, 6-7 marginal rows (MR) on each side, 4 complete and 2-3 partial DK, and greenish cortical granules. This is the first identification and description of these 2 species, A. petzi and P. enigmatica, in South Korea.

Antioxidant Activities of Prunus salicina Lind cv. Soldam (Plum) at Different Growth Stages (생육 시기에 따른 피자두(Prunus salicina Lindl. cv. Soldam)의 항산화 효과)

  • Yu Mi-Hee;Lee Syngook;Im Hyo Gwon;Kim Hyun Jeong;Lee In-Seon
    • Korean Journal of Food Preservation
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    • v.11 no.3
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    • pp.358-363
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    • 2004
  • This study was performed to evaluate the antioxidant effect of Prunus salicina Lindl. cv. Soldam at different growth stages (sample 1-8). Previous studies shows that this fruits possess hematopoiesis effect, osteoporosis prevention, and antimutagenic effects. Prunus salicina Lindl. cv. soldam was picked in every 5 days from the 40th day before harvesting date for marketing in Gimcheon, Gyeongbuk. The fruits at different growth stages (sample 1-8) were extracted with 60$\%$ acetone and chlorophyll in the extracts was removed. In proximate compositions, the contents of moisture of sample 1, 5, 8 were 88.52, 87.01, 83.56$\%$ ; crude ash were 7.12, 3.35, 3.57$\%$ ; crude protein were 7.52, 5.55, 3.85$\%$ ; crude fat contents were 3.20, 0.99, 5.15$\%$, respectively. The contents of total polyphenols and condensed tannin in the acetone extracts from sample 1, 5, 8 were 10.67, 4.05, 2.57$\%$, and 8.36, 3.11, 1.88$\%$, respectively. The antioxidantive effect of acetone extracts from immature fruits showed strong scavenging effect on DPPH free radicals. The RC$_{50}$ values of the extracts from sample 1, 2 were 2.23, 9.70 $\mu$g/mL, respectively while those of butylated hydroxyanisole (BRA) was 5.25 $\mu$g/mL. The extracts from immature fruits showed over 85$\%$ inhibition on peroxidation of linoleic acid at 100 $\mu$g/mL as determined by both the ferric thiocyanate (FTC) and the thiobarbituric acid (TBA) method.

Experimental Study on Microseismic Source Location by Dimensional Conditions and Arrival Picking Methods (차원 및 초동발췌방법에 따른 미소진동 음원위치결정 실험연구)

  • Cheon, Dae-Sung;Yu, Jeongmin;Lee, Jang-baek
    • Tunnel and Underground Space
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    • v.29 no.4
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    • pp.243-261
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    • 2019
  • Microseismic monitoring technologies have been recognized for its superiority over traditional methods and are used in domestic and overseas underground mines. However, the complex gangway layout of underground mines in Korea and the mixed structure of excavated space and rock masses make it difficult to estimate the microseismic propagation and to determine the arrival time of microseismic wave. In this paper, experimental studies were carried out to determine the source location according to various arrival picking methods and dimensional conditions. The arrival picking methods used were FTC (First Threshold Cross), Picking window, AIC (Akaike Information Criterion), and 2-D and 3-D source generation experiments were performed, respectively, under the 2-D sensor array. In each experiment, source location algorithm used iterative method and genetic algorithm. The iterative method was effective when the sensor array and source generation were the same dimension, but it was not suitable to apply when the source generation was higher dimension. On the other hand, in case of source location using RCGA, the higher dimensional source location could be determined, but it took longer time to calculate. The accuracy of the arrival picking methods differed according to the source location algorithms, but picking window method showed high accuracy in overall.

A Study on the Fair Trade of Content Rights: Protecting Small & Medium Sized Content Creators and Publishers in the Nested Publishing Industry (콘텐츠 권리의 공정거래에 관한 연구: 출판산업 가치사슬에서 중소 콘텐츠 창작자와 출판업자의 권리 보호)

  • Choi, Gyoung-Gyu;Lee, Young-Dae
    • The Journal of Small Business Innovation
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    • v.20 no.2
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    • pp.51-66
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    • 2017
  • Online and wireless communications have dramatically changed the contents industry marketplace. Content transactions are now instantaneous as distribution channels move from the 'mart' to smart platforms, creating opportunities for content creators large and small. Yet with opportunity comes the threat of imbalance in the industry ecosystem. In order to ensure the health and diversity of an industry that relies so heavily on the welfare of small creative enterprises, it is essential to establish rules for the fair transaction of content rights. Several structural forces may work against such rules: first, the industry consists of a large number of small distributor intermediary businesses (e.g. major publishers); second, end distributors (e. g. platforms) maintain a superior, monopsony position; and third, economic valuation of content is difficult. In terms of acquisition business model, rights transactions can be classified into three general models: (1) license model, (2) original acquisition model, and (3) monopsony model. This study explores the publishing industry in detail, considering key statutes and their operation across the models. From analysis of Korea and the US statutes and case law, and decisions of the Fair Trade Commission (FTC) of Korea, we offer evaluation criteria for discerning between fair and unfair content rights transactions. We further recommend industry practice that may enhance the likelihood for fair content rights transactions, and thus a thriving publishing ecosystem.

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