• 제어로봇시스템학회논문지
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• 제18권3호
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• pp.285-294
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• 2012

Using bearing measurement only, target motion state is not directly obtained so that TMA (Target Motion Analysis) is needed for this situation. TMA is a nonlinear estimation technique used in passive SONAR systems. Also it is the one of important techniques for underwater combat management systems. TMA can be divided to two parts: batch estimation and sequential estimation. It is preferable to use sequential estimation for reducing computational load as well as adaptively to target maneuvers, batch estimation is still required to attain target initial state vector for convergence of sequential estimation. Selection of batch time interval which depends on observability is critical in TMA performance. Batch estimation in general utilizes predetermined batch time interval. In this paper, we propose a new method called the BTIS (Batch Time Interval and Initial State Estimation). The proposed BTIS estimates target initial status and determines the batch time interval sequentially by using a bank of GMM-TS (Gaussian Mixture Measurement-Track Splitting) filters. The performance of the proposal method is verified by a Monte Carlo simulation study.

• 제어로봇시스템학회논문지
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• 제22권10호
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• pp.788-796
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• 2016

Bearing and frequency measurements of TMA (Target Motion Analysis) in passive line array SONAR have lower bearing rate and frequency doppler, and are not detected or tracked continuously because of various ocean environments. This is a main reason to effect the TMA performance and it takes a long time to get TMA solutions. We propose the bearing and frequency TMA(BFTMA) using accumulative batch estimation to solve the TMA problem of line array passive SONAR. The accumulative batch estimation structure is based on MLE (Maximum Likelihood Estimation) but used accumulative measurements. The accumulative batch estimation is applied for the BFTMA with nonlinear Kalman filter to estimate the target range, speed and course. Simulation and sea data analysis were carried out to verify the performance and applicability of the proposed techniques.

• Journal of Microbiology and Biotechnology
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• 제9권5호
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• pp.554-561
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• 1999

A novel estimation method was investigated for determining the concentrations of residual biomass, poly-3-hydroxybutyrate (PHB), and main nutrients including carbon and nitrogen sources, phosphate, and mineral ions from the supplied amount of ammonia solution used for a pH-control solution and nitrogen source in a PHB fermentation. The estimation equations for a batch culture and a fed-batch culture were derived from the relationship between the growth rate of residual biomass and the feed rate of the pH-control solution, and then were applied to the batch culture and the fed-batch cultures of Alcaligenes latus. This method was successfully applied to estimate the concentrations of residual biomass, PHB, and nutrients.

• 대한수학회논문집
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• 제11권3호
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• pp.841-853
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• 1996

This article finds smoothed perturbation analysis estimates for the derivatives of mean performance measures in a Markovian queue with batch arrivals. We show that those estimates can be observed from a single sample path.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
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• pp.224-228
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• 1994

This paper deals with a Batch processor application to determine orbit trajectories from satellite tracking data. The purpose of this paper is to find the initial state vectors. In order to determine the better estimation process, several different cases are compared. Here we adapt a minimum variance concept to develop estimation and prediction techniques. These results are compared with by SEP, Spherical Error Probable, values.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2002년도 하계학술대회 논문집 D
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• pp.2102-2104
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• 2002

Batch estimation 알고리듬은 수집된 표적에 대한 모든 정보들을 사용하여 상태변수의 초기값을 추정하게 되며 그 구간동안 표적이 일정한 속도로 움직이고 표적 음원의 주파수는 그 값이 항상 일정하다는 가정을 했다. 본 논문에서는 이러한 가정을 위배하는 표적 음원의 주파수 변화에 대해 대처하기 위한 각도와 주파수정보를 이용하는 Batch estimation 알고리듬과 각도정보만을 사용하는 Batch estimation 알고리듬의 경우를 표적 음원의 주파수 변화를 감지하여 스위칭 할 수 있는 방법에 대해 알아본다.

• 한국산학기술학회논문지
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• 제20권9호
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• pp.551-557
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• 2019

생산 공정에서 발생하는 비정상적인 이상 (fault)의 진단 (diagnosis)은 고품질의 제품을 생산함에 있어 필수적이라 할 수 있다. 회분식 공정 (batch process)과 같이 부가가치가 큰 반도체나 의약품 등의 첨단 제품을 생산하는 공정에서는 더욱 실시간 진단의 역할이 커지고 있다. 본 연구에서는 회분식 공정으로부터 얻은 측정 데이터와 비선형 분류(nonlinear classification)에 기초한 실시간 이상 진단 체계에 있어서 변수선택과 미래값 추정 기법이 진단 성능에 미치는 영향을 평가한다. 공정 변수 중 진단에 필수적이며 기여도가 높은 변수만을 선택하여 진단 모델 (diagnosis model)을 구성함으로써 진단 성능의 향상을 기대할 수 있다. 본 연구에서는 여러 변수선택 (variable selection) 기법들의 진단 성능을 비교 평가한다. 또한, 현재 진행 중인 회분식 조업 데이터는 종료되기 이전에는 진단에 필요한 전체 데이터를 얻을 수 없으므로 현재 시점에서 측정되지 못한 미래 측정값 (future observations)이 추정되어야 한다. 미래값 추정방법들의 선택이 변수선택과 분류기반 진단 관점에서 진단 성능에 어떻게 영향을 주는지 평가한다. 폴리염화비닐 회분식 공정에 대한 사례 연구를 수행하여 최적의 변수선택과 미래값 추정방법을 도출하였다. 변수선택 방법에 따라 최대 21.9%와 13.3%의 성능 향상을 보였으며 미래값 추정방법에 따라서는 최대 25.8%와 15.2% 향상됨을 알 수 있었다.

• Biotechnology and Bioprocess Engineering:BBE
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• 제11권1호
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• pp.61-66
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• 2006

The simple Langmuir isotherm is frequently employed to describe the equilibrium behavior of protein adsorption on a wide variety of adsorbents. The two adjustable parameters of the Langmuir isotherm - the saturation capacity, or $q_m$, and the dissociation constant, $K_d$ - are usually estimated by fitting the isotherm equation to the equilibrium data acquired from batch equilibration experiments. In this study, we have evaluated the possibility of estimating $q_m$ and $K_d$ for the adsorption of bovine serum albumin to a cation exchanger using batch kinetic data. A rate model predicated on the kinetic form of the Langmuir isotherm, with three adjustable parameters ($q_m,\;K_d$, and a rate constant), was fitted to a single kinetic profile. The value of $q_m$ determined as the result of this approach was quantitatively consistent with the $q_m$ value derived from the traditional batch equilibrium data. However, the $K_d$ value could not be retrieved from the kinetic profile, as the model fit proved insensitive to this parameter. Sensitivity analysis provided significant insight into the identifiability of the three model parameters.

• 한국군사과학기술학회지
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• 제7권2호
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• pp.22-31
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• 2004

In this paper, the measurements preprocessing algorithm for the fading of bearing and frequency measurements is proposed, which can improve the performance of BFTMA(Bearing and Frequency Target Motion Analysis). The fading and detection relation between bearing and frequency are rigorously established for measurements preprocessing, and BFTMA can be carried out the estimation of target motion by using measurements preprocessing. Batch estimation with bearing and frequency using the proposed algorithm can be applied to estimate the initial target states despite of the fading of frequency measurement. Simulation results show that BFTMA using the proposed measurements preprocessing has superior estimation performance, compared with batch estimation using only bearing measurements.

• Transactions on Control, Automation and Systems Engineering
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• 제4권1호
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• pp.62-74
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• 2002

The tracking of a reference temperature trajectory in a polymerization batch reactor is a common problem and has critical importance because the quality control of a batch reactor is usually achieved by implementing the trajectory precisely. In this study, only energy balances around a reactor are considered as a design model for control synthesis, and material balances describing concentration variations of involved components are treated as unknown disturbances, of which the effects appear as time-varying parameters in the design model. For the synthesis of a tracking controller, a method combining the input-output linearization of a time-variant system with the parameter estimation is proposed. The parameter estimation method provides parameter estimates such that the estimated outputs asymptotically follow the measured outputs in a specified way. Since other unknown external disturbances or uncertainties can be lumped into existing parameters or considered as another separate parameters, the method is useful in practices exposed to diverse uncertainties and disturbances, and the designed controller becomes robust. And the design procedure and setting of tuning parameters are simple and clear due to the resulted linear design equations. The performances and the effectiveness of the proposed method are demonstrated via simulation studies.