• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
• /
• pp.352-355
• /
• 1986

In this paper, some candidates suggested for the improvement of the robustness in adaptive control systems are shortly surveyed. Using dead zone concept of error in adaptation process, gain retardation methods such as .sigma.-modification and parameter restriction method are those considered. Feedforward compensation and normalized adaptation technique are also considered. New modeling technique suggested by Donati et al is used for the indirect control of plants containing unmodeled dynamics. The frequency band of input signal, which is used as a test signal and control signal simultaneously, is directly related to the control of plants containing high frequency parastics. Computer simulation results of the some selected algorithms are shown.

• 한국지구물리탐사학회:학술대회논문집
• /
• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
• /
• pp.518-521
• /
• 2003

LCA (Life Cycle Assessment), that unifies the scale of various environmental impacts, and simulated annealing are applied to optimizing electrolysis of wastewater from PCB (Printed Circuit Board) production. The changes of environmental impact can be quantified with LCA and the total changes of environmental impacts can be expressed as a function of power consumed, Cu recycled, $Cl_2$, NOx and SOx discharged through restriction of feasible reactions. In a single-variate condition, the environmental optimum can be easily obtained through plotting and comparing each environmental impact value. In 8V potentiostatic electrolysis, the lowest environmental impact can be achieved after 90min. To optimize a multi-variate conditional system, simulated annealing can be applied and this can give the quick and near optimum in complex systems, where many input and output materials are involved, through experimentally measured values without a theoretical modeling.

• Journal of Advanced Marine Engineering and Technology
• /
• 제22권2호
• /
• pp.174-180
• /
• 1998

Robust stability of discrete-time regulators which utilize state predictors to compensate computation delays is considered. Novel expressions for the return difference matrices and the complementary sensitivity matrices at the input and the output of the regulator are found to obtain simple bounds for unstructured perturbations. Robust stability for pertubations of the system matrix and /or the gain matrix is also considered. under certain restriction on the nominal system simple bounds for the pertubations are obtained directly from the characteristic equation. It is shown that as far as the effect of the computation delays concerns these bounds have explicit relation to those for the unstructured pertubations.

• 한국통신학회논문지
• /
• 제22권7호
• /
• pp.1403-1410
• /
• 1997

Because streaming mode connection server suitable to wide area ATM networks performs transmission, reception and lookup with time restriction for the transmission time of a cell, it has demerits of large cell loss incase that burst traffic occurs. Therefore, in this paper to decrease cell loss we propose a high speed CAM (Content Addressable Memory) which is capable of processing data of streaming mode connections server at a high speed. the proposed CAM is applied to forwarding table VPC map which performs function to output connection numbers about input VPI(Virtual Path Identifier)/VCI(Virtual Channel Identifier). The designed high speed CAM consist of DBL(Dual Bit Line) CAM structure performed independently write operation and match operation and two-port SRAM structure. Also, its simulation verification and full-custom layout is performed by Hspice and Composs tools in 0.8 .$\mu$m design rule.

• 대한전기학회논문지
• /
• 제41권8호
• /
• pp.902-913
• /
• 1992

There have been several control schemes for the single input systems with unmeasurable state variables using variable structure control(VSC) theory. In the previous VSC, the systems must be represented in phase canonical form and the complete measurements for each state variable must be assumed. In order to eliminate these restrictions several VSC methods were proposed. And especially for the systems in phase canonical form with unmeasurable state variables, the reduced order switching function algorithm was proposed. But this method has many drawbacks and can not be used in the case of general form (not phase canonical form) dynamic system. Therefore this paper propose new construction method of switching fuction for the systems in phase canonical form, which reduce the restriction of reduced order switching function algorithm. And this algorithm can be realized for any state representation and adopted in the systems where not all states are available for switching function synthesis or control.

• 한국산업보건학회지
• /
• 제22권3호
• /
• pp.191-199
• /
• 2012

Objectives: The study aim was to evaluate the application of a chemical exposure assessment tool for the Korean workplace. The Ministry of Employment and Labor in Korea (KMOEL) introduced the need for workplace risk assessments in 2011, requiring the Korean chemical industry to consider both domestic and international chemical regulation policies (e.g., estimations of exposure scenarios). Exposure scenarios are required in the European Union as part of material safety data sheets (MSDS) under the Registration, Evaluation, Authorization, and Restriction of Chemicals (REACH) system. Methods: Although many programs for the estimation of exposure have been developed worldwide, to date there is no standard for the Korean workplace. To develop programs suitable for the Korean workplace, we examined the applicability of the European Center for Ecotoxicology and Toxicology of Chemicals target risk assessment (ECETOC TRA), which is recommended by the European Chemical Agency (ECHA). Results: To investigate the applicability of the ECETOC TRA to Korean industry, this study simulated 15 industrial processes. The predicted respiratory exposures for four processes using origin input parameters were underestimated compared to the measured respiratory exposure. Using calibrated input parameters, results for two processes were underestimated compared to the measured respiratory exposure. This result suggests that the use of calibrated input parameters reduces the differences between predicted and measured respiratory exposure. Conclusions: we developed applicable exposure estimating method by modifying the ECETOC TRA program; one suggested the development of exposure estimating program that explains Korea domestic workplace exposure scenario.This study will support the introduction of exposure scenario in MSDS system and protect health of worker from hazardous chemical.

• 대한교통학회지
• /
• 제22권3호
• /
• pp.159-166
• /
• 2004

도로용량편람에서 정의하고 있는 용량은 하류부에 용량을 제한하는 요소가 없다는 것을 가정한 정상교통류에 대한 용량 개념으로서, 이는 전통적으로 계획, 설계, 현재 및 장래 도로시설의 운영상태 분석 등에 사용되어 왔다. 실시간 제어는, 용량을 초과하지 않는 교통류를 유지시켜 혼잡교통류로의 전이를 막고, 물리적 여건이나 제반 확률적 요인으로 혼잡이 발생하였을 경우 조속히 용량이하로 교통량을 떨어뜨려 정상교통류로 회복시키는 데 목표를 둔다. 이러한 맥락에서 용량은 실시간 제어의 효과를 좌우하는 중요한 입력변수이며, 정상교통류 상태라면 혼잡으로 전이되지 않을 임계치로서의 용량 산정이 중요한 관건이다. 그러나 혼잡교통류 상태에서 정상교통류로 되도록 빨리 회복시켜 주기 위한 제어 기준으로서의 용량은, 하류부 혼잡의 시공간적 전개에 따라 변하는 값이어야 하며 이러한 동적 용량변화를 정확히 예측할 수 있는 방법론이 요구된다. 이에 본 연구에서는 기존의 용량 개념을 출력 개념의 용량으로 정의하고, 입력 개념의 용량을 최대가능처리량(Maximum Sustainable Throughput)으로 새롭게 정의하였다. 이 최대가능처리량은 혼잡의 시공간적 전개에 따라 결정되는 동적 용량이며, 이러한 혼잡의 시공간적 전개는 Newell의 단순화된 교통량-밀도 모형으로 예측할 것을 제안하였다.

• Molecules and Cells
• /
• 제46권10호
• /
• pp.592-610
• /
• 2023

The Hippo kinase cascade functions as a central hub that relays input from the "outside world" of the cell and translates it into specific cellular responses by regulating the activity of Yes-associated protein 1 (YAP1). How Hippo translates input from the extracellular signals into specific intracellular responses remains unclear. Here, we show that transforming growth factor β (TGFβ)-activated TAK1 activates LATS1/2, which then phosphorylates YAP1. Phosphorylated YAP1 (p-YAP1) associates with RUNX3, but not with TEAD4, to form a TGFβ-stimulated restriction (R)-point-associated complex which activates target chromatin loci in the nucleus. Soon after, p-YAP1 is exported to the cytoplasm. Attenuation of TGFβ signaling results in re-localization of unphosphorylated YAP1 to the nucleus, where it forms a YAP1/TEAD4/SMAD3/AP1/p300 complex. The TGFβ-stimulated spatiotemporal dynamics of YAP1 are abrogated in many cancer cells. These results identify a new pathway that integrates TGFβ signals and the Hippo pathway (TGFβ→TAK1→LATS1/2→YAP1 cascade) with a novel dynamic nuclear role for p-YAP1.

• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2000년도 춘계학술대회논문집
• /
• pp.125-134
• /
• 2000

본 논문에서는 제산기가 제거된 싱글톤 퍼지제어기에 대한 새로운 귀속도 함수 발생기 및 계수 선택기회로를 제안함으로써 회로 구성소자를 줄일 수 있는 기법을 제안하였다. 입력 값의 범위에 따라 추론에 사용될 언어변수를 미리 결정하여 필요한 귀속도 함수만을 발생시킴으로서 보다 간략화 된 회로를 구성할 수 있으며 또한 추론의 결과에 영향을 줄 계수들을 미리 선택해 주는 계수 선택회로를 통해 전건부의 적합도가 0이 되는 모든 규칙들에 대한 연산 회로를 제거하였다. 그리고 귀속도 함수 발생기에서 발생하는 전류모드 CMOS 회로의 문제점인 팬-아웃(fan-out)수의 제한을 해결하기 위해 전압입력-전류출력의 귀속도 함수발생기를 OTA방식으로 구성하였다. 기존의 방법에 비해 블록 수와 소자수가 큰 폭으로 감소하였음을 확인하였고, 또한 전건부와 언어변수의 수가 증가할수록 더욱 효과적임을 확인하였다.

• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2000년도 추계공동학술대회논문집
• /
• pp.357-365
• /
• 2000

본 논문에서는 제산기가 제거된 싱글톤 퍼지제어기에 대한 새로운 귀속도 함수 발생기 및 계수 선택기회로를 제안함으로써 회로 구성소자를 줄일 수 있는 기법을 제안하였다. 입력 값의 범위에 따라 추론에 사용될 언어변수를 미리 결정하여 필요한 귀속도 함수만을 발생시킴으로서 보다 간략화 된 회로를 구성할 수 있으며 또한 추론의 결과에 영향을 줄 계수들을 미리 선택해 주는 계수 선택회로를 통해 전건부의 적합도가 0이 되는 모든 규칙들에 대한 연산 회로를 제거하였다. 그리고 귀속도 함수 발생기에서 발생하는 전류모드 CMOS 회로의 문제점인 팬-아웃(fan-out)수의 제한을 해결하기 위해 전압입력-전류출력의 귀속도 함수발생기를 OTA방식으로 구성하였다. 기존의 방법에 비해 블록 수와 소자수가 큰 폭으로 감소하였음을 확인하였고, 또한 전건부와 언어변수의 수가 증가할수록 더욱 효과적임을 확인하였다.