• 대한전기학회논문지
• /
• 제38권9호
• /
• pp.724-732
• /
• 1989

The structure of engine and its interaction are investigated and the construction of mathematical model for the performance evaluation is presented and then simulated. The total system is classified as air-fuel inlet element, intake manifold, combustion, and engine dynamics and their control function are schematically evaluated. Because of the model structure with general engine function and computer simulation of the chosen engine, physical characteristics of the corresponding engine and the engine data of normal operation state are used. According to the study, it is possible to predict the mixture rate by by the difference in the mass of fuel and air into cylinder and to evaluate and trace dynamic characteristic of operation state under various operating condition. The model characteristic under the transient operating condition makes it possible to effectively evaluate the operation of actual engine through the result of simulation.

• 통합자연과학논문집
• /
• 제6권1호
• /
• pp.39-45
• /
• 2013

Robust design is an approach to reducing performance variation of quality characteristic values in quality engineering. Taguchi has an idea that mean and variation are handled simultaneously to reduce the expected loss in products and processes. In the Taguchi parameter design, the product-array approach using orthogonal arrays is mainly used. However, it often requires an excessive number of experiments. An alternative approach, which is called the combined-array approach, was studied. In these studies, only single quality characteristic (or response) was considered. In this paper we propose how to simultaneously optimize for multiple quality characteristics (or multiresponse) using desirability function when we used the combined-array approach to assign control and noise factors.

• 대한임베디드공학회논문지
• /
• 제10권5호
• /
• pp.265-272
• /
• 2015

This paper presents an improved feature extraction method to achieve a good performance in the detection of splicing forged images. Strong edges caused by the image splicing destroy the statistical dependencies between parent and child subbands in the wavelet domain. We analyze the co-occurrence probability matrix of parent and child subbands in the wavelet domain, and calculate the statistical moments from two-dimensional characteristic function of the co-occurrence matrix. The extracted features are used as the input of SVM classifier. Experimental results show that the proposed method obtains a good performance with a small number of features compared to the existing methods.

• 대한전기학회논문지:전기기기및에너지변환시스템부문B
• /
• 제53권8호
• /
• pp.463-468
• /
• 2004

This paper was applied space harmonic method as a characteristic analysis technique for slotless PMLSM. There is advantages of active response to the change of design parameters as well as reduction of the calculation time. The method can be overcome disadvantages of finite element analysis that needs long times calculation, repetitions of pre and post-process. In this paper, 3D-space harmonic method was applied to consider the precise description of end turn coil shape and the changes of characteristic according to changes of length of z-axis direction. The thrust of optimal design was performed using genetic algorithm to enhance the thrust which is the disadvantage of slotless type PMLSM. For design parameters, width of permanent magnet, width of coil, width of coil inner and lengths of z-axis direction were selected. For objective functions. thrust per weight. thrust per volume. multi-objective function was selected.

• 의료ㆍ복지 건축 : 한국의료복지건축학회 논문집
• /
• 제10권2호
• /
• pp.125-133
• /
• 2004

Safety, accessibility and distinguishment as the concept of architectural planning and design are demanded in staircases due to increase of the old aged people and disabled people's enlarged social participation. In this research is tried to provide the importance of vertical walking function at the design for the staircases. For this reason, structural elements of the staircases are studied in the ergonomic aspect for barrier-free environment and a comparative study is made on the regulations of the staircases in the inside and outside of the country in disabled & aged people's view. Based on this study, the quality of the staircases in public facilities and Apartments is analyzed. As the result, it has been proved that the vertical walking function of the staircases is the most fundamental characteristic of the staircases design before everything else.

• 조명전기설비학회논문지
• /
• 제15권2호
• /
• pp.31-37
• /
• 2001

본 논문은 기존의 전원분할 기능만을 하는 전해 커패시터 대신에 ZVS, ZCS와 전원분할 및 공진 기능을 동시에 가지며, 분할비를 이용하면 서로 다른 출력특성을 얻을 수 있는 ZVS-HB형 DC-DC 컨버터를 제안하고 있다. 회로의 해석은 전원분할 커패시터의 분할비에 따른 대부분의 특성들을 무차원화 파라미터를 적용하여 범용성 있게 기술하고 있다. 또, Power-MOSFET를 적용한 실험에서 얻은 실험치와 특성해석에서 얻은 이론치를 비교 하여 특성해석의 정당성을 확인하였다.

• 전력전자학회논문지
• /
• 제16권5호
• /
• pp.484-493
• /
• 2011

본 논문은 뉴로-퍼지 제어기를 이용한 최적의 퍼지 소속함수에 동조하는 다층 신경회로망을 사용한 성능이 개선된 MPPT 알고리즘을 제안한다. 퍼지 제어기의 성능은 퍼지규칙과 퍼지 소속함수의 폭의 영향을 받는다. 뉴로-퍼지 제어기는 신경망 학습을 통해 퍼지 소속함수의 최적 폭을 이용하기 때문에 기존 퍼지 제어기보다 우수한 응답특성을 갖는다. 실험과 시뮬레이션 결과를 통해 제안된 알고리즘의 우수한 제어특성을 확인한다.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1994년도 추계학술대회 논문집 학회본부
• /
• pp.75-77
• /
• 1994

This paper presents a method of obtaining transmission network equivalents from the network's driving-point admittance characteristic. Proposed method is based on modal decomposition representation for the large-scale interconnected system. As a result, Norton-type of discrete-time filter model can be generated. It can reproduce the driving-point admittance characteristic of the network. Furthermore proposed model can be implemented into the EMTP in a direct manner. The simulation results with the full system representation and the developed equivalent system showed a good agreement.

• 대한의용생체공학회:의공학회지
• /
• 제14권2호
• /
• pp.185-193
• /
• 1993

In this paper, the peak detection algorithm was developed for the purpose of screening of the target compounds. Algorithm is divided into searching the characteristic ion and peak detection. The heuristic knowledge about analytical chemistry was applied for the searching the characteristic ion. Peak detection was accomplished in comparison with the peak identification strings and pattern strings around the retention time. Pattern strings are composed with the number which generated by pattern identification function. The variables of pattern identification function are the codes which represent the difference of two adjacent abundances Some of the free steroids were selected to demonstrate the proposed algorithm.

• 전력전자학회논문지
• /
• 제24권5호
• /
• pp.356-364
• /
• 2019

In this study, major problems, such as licensing problems due to civil complaints, deterioration of facility period, and damage of modules, are exposed to many problems in domestic businesses. Particularly, the photovoltaic (PV) modules applied to early PV systems have been repaired and replaced over the past two decades, and a new module-based aging detection method is needed to expand the maintenance market and stabilize and repair power supplies. PV modules in a PV system use a string that is configured in series to generate high voltage. However, even if only one module of the solar modules connected in series ages, the power generation efficiency of the aged string is reduced. Therefore, we propose a topology that can measure the instantaneous PV characteristic curve to determine the aging module in the solar string and the aging judgment algorithm using the measured PV characteristic curve.