• 전력전자학회:학술대회논문집
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• 전력전자학회 2001년도 전력전자학술대회 논문집
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• pp.389-392
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• 2001

This paper presents neural load disturbance observer that used to deadbeat load torque observer and regulation of the compensation gain by parameter estimator. As a result, the response of PMSM follows that of the nominal plant. The load torque compensation method is compose of a neural deadbeat observer. To reduce of the noise effect, the post-filter, which is implemented by MA process, is proposed. The parameter compensator with RLSM (recursive least square method) parameter estimator is suggested to increase the performance of the load torque observer and main controller. The proposed estimator is combined with a high performance neural torque observer to resolve the problems. As a result, the proposed control system becomes a robust and precise system against the load torque and the parameter variation. A stability and usefulness, through the verified computer simulation, are shown in this paper.

• Nuclear Engineering and Technology
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• 제27권5호
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• pp.784-791
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• 1995

방사선계측에서는 방사선검출기(detector)로부터 나오는 pulse를 처리하는 데 있어서 pulse의 counting 손실이 발생한다. 이 손실을 최소화하거나 보상하기 위한 여러가지 방법들이 제시되어 왔으나, 아직도 절대적인 해답이 확립되지 않은 실정이다. 본 연구에서는 기 제시된 보상알고리즘들을 그 기능을 구현하는 전자회로와 함께 기술하고 특징을 분석하였다. 또한 본 연구를 통해 pulse의 counting손실을 보상하는 한가지 알고리즘 개선방향을 제시하였다.

• 해양환경안전학회지
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• 제17권1호
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• pp.53-60
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• 2011

본 연구에서는 의사결정자의 대립관계가 있는 항만개발 문제에 대한 우선순위 평가와 보상관계를 분석하였다. 이를 위해 먼저 항만개발에 대한 관련문헌을 분석하여 평가요소를 추출하였고, FSM법을 이용하여 평가요소를 구조화하고, 구조화 분석을 통해 평가항목을 선정하였다. 두 번째, 항만개발 평가 주체를 지역주민, 이용자, 지자체로 선정하고 AHP법을 이용하여 종합 평가치를 산출하였다. 세 번째 JMPR법을 이용하여 평가주체간 제휴를 구성하였을때 종합 평가결과와 대체안 선정에 따른 불만량을 최소로 하여 평가하는 방법을 제시하였다. 또한 대체안 선정에 따른 보상문제를 정량화하고 보상관계를 분석하였다. 그 결과 대상 항만중 부산항 개발이 가장 우선되어야 하며, 항만이용자는 환경에 대한 인식의 개선과, 지자체에서는 환경 친화적인 항만개발을 위한 환경 인센티브 정책을 추진해야 할 것이다.

• 디지털융복합연구
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• 제16권6호
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• pp.63-73
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• 2018

본 연구는 중소 제조 및 서비스업체를 대상으로 하여 KMS의 경영성과에 미치는 영향요인을 지식정보요인과 관리 요인으로 설정하여 이들 요인들이 경영성과에 미치는 영향을 분석하였고, 평가와 보상을 조절변수로 설정하여 평가와 보상이 지식정보요인 및 관리요인과 경영성과 간에 미치는 조절적 효과를 분석하였다. 분석결과, 지식 적합성, 지식정보의 신뢰성, 지식관리프로세스 지원으로 설정된 지식정보 요인은 경영성과에 정의 영향을 미치는 것으로 분석되었고, 관리요인 중에서는 학습의 조직화와 협력 요인은 경영성과에 정의 영향을 미치는 것으로 분석되었다. 평가와 보상이 지식정보요인 및 관리요인과 경영성과 간에 조절적인 역할을 하고 있는지를 검증한 결과에서는 지식정보요인의 지식 적합성, 지식정보의 신뢰성, 지식관리프로세스지원, 관리요인의 지식공유활동, 협력은 경영성과에 조절적인 역할을 하고 있는 것으로 분석되었다.

• 한국기계가공학회지
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• 제15권3호
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• pp.15-20
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• 2016

In this study, a numeric model for the prediction of ideal surface roughness in the rounded end mill was derived from the shape of the tool and feed per tooth. The model is compared with the well-known model of a ball and flat end mill. The ideal surface roughness was matched to the actual surface roughness by the linear equation, from which the empirical constant should be gathered from the test machining systems in the industry.

• 한국기계가공학회지
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• 제10권5호
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• pp.26-30
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• 2011

Currently, many researches are carried out about tilting index table, which is one of the main component of 5-axis machine tool. The performance of the tilting index table is associated the rotational accuracy which is very important factor for high precision machining because it have an effect on machining error. In this paper, a tilting index table is developed, and the rotational accuracy of the tilting index table using a laser measurement equipment is measured. In addition, a correction value is obtained from the measured value through compensation, and the correction value is used to improve the accuracy of the table. Comparative analysis is carried out for the accuracy of the table before and after compensation. This paper can be used by a reference for performance and reliability advancement of tilting index table.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1997년도 춘계학술대회 논문집
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• pp.873-877
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• 1997

This paper presents experimental results to know the charcteristics of machined surface due to cutter runout. Cutter runout is a common but undesirable phenomenon in multi-tooth machining such as end-milling process because it introduces variable chip loading to insert which results in a accelerated tool wear, amplification of force variation and hence enargement vibration amplitude. To develop in-proess cutter runout compensation system, set-up the micro-positoning mechanism which is based on piezoelectric translator embeded in the work holder to manipulate the depth of cut in real-time. And feasibility test of system was done under the various experimental cutting conditions. This results provide lots of information to build-up the precision machining technology.

• 한국멀티미디어학회논문지
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• 제17권11호
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• pp.1270-1278
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• 2014

The modern infrared (IR) imaging systems use mainly one or more wavelength bands among short wavelength IR (SWIR), middle wavelength IR (MWIR), and long wavelength IR (LWIR) bands. In the process of IR image synthesis and modeling, IR image wavelength-band conversion which transforms arbitrary band image to other band one is required. The wavelength-band conversion procedure includes a temperature estimation process of an object surface. However, in this procedure, an approximated Planck's radiation equation causes errors in estimated temperature. In this paper, we propose an estimation temperature error attenuation method in IR image band conversion procedure. The estimated temperature is corrected with a slope information of radiance according to it. The corrected temperature is used for generation of the other band IR image. The verification of proposed method is demonstrated through the simulation.

• 한국정밀공학회지
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• 제18권2호
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• pp.54-62
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• 2001

This paper describes a new method for measuring the changes in specific surface asperities arising from processes such as finishing, coating, wear and corrosion. In repetitive measurements, relocation device gives the same position and orientation so that specific profile can be obtained. A low-cost relocation device is designed and its performance is assessed. The error in relocation process is compensated by statistic compensation algorithm. And, a removing process of cusp by grinding is observed by the proposed method.

• 한국공작기계학회논문집
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• 제17권4호
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• pp.112-118
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• 2008

In order to meet the optical performance in the process of the micro lens manufacturing with plastics, it is important to embody accuracy in shape and surface roughness to the intended design. Since it is difficult to machine exactly the mold core of lens fit to the designed shape, in this paper, a simple program using MATLAB is developed for shape correction of the mold core after first machining it. This program evaluates correction parameters(aspheric coefficients and curvature) and generates aspheric NC data for compensating the core surface in prior machining process. The program provides the way to manufacture plastic injection molding lens with aspheric shape of high precision, and is expected to be effective for correction and to shorten the processing time.