• Journal of Industrial Technology
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• v.27 no.A
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• pp.149-155
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• 2007

The counter emf(electromotive forces) of a permanent magnet multi-phase brushless motor is generally a non-sinusoidal wave or a non-ideal trapezoid. So, conventional modeling using a sinusoidal wave or an ideal trapezoid counter emf can result in errors. In order to reduce modeling errors for simulation and analysis the properties of a multi-phase brushless AC motor, this paper proposes a phase variable model that is a mixed modeling technique using both Finite Element Analysis(FEA) based circuits and motor voltage equations. The phase model parameters including the counter emf voltage waveform are obtained by using of FEA, and the mixed modeling technique based on circuits and equations is used to implement a simulation model for multi-phase brushless AC motors with any counter emf voltage waveforms. Adequacy of the proposed model is established from the simulation and experimental results for a seven-phase brushless motor.

• Speech Sciences
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• v.13 no.1
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• pp.117-128
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• 2006

The two-channel Generalized Sidelobe Canceller (GSC) scheme suffers from the presence of leakage signal in the reference channel. The leakage signal is caused by the dissimilar impulse responses between microphones, and different paths from speech source to microphones. Such leakage is detrimental to speech enhancement of the GSC since the desired reference signal becomes corrupted. In order to suppress the signal leakage, two matrix injection methods are proposed. In the first method, a simple gain compensation matrix is used. In the second, a projection matrix for reducing the error between the actual and the ideal primary and reference signals, is used. This paper describes the performance degradation resulting from leakage, and proposes effective methods to resolve the problem. Representative experiments were conducted to demonstrate the effectiveness of the proposed methods on recorded speech and noise in an actual automobile environment.

• The Transactions of The Korean Institute of Electrical Engineers
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• v.58 no.9
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• pp.1821-1826
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• 2009

An adaptive neural controller for perturbed strict-feedback nonlinear system is proposed. All the previous adaptive neural (or fuzzy) controllers are based on the backstepping scheme where the universal approximators are employed in every design steps. These schemes involve virtual controls and their time derivatives that make the stability analysis and implementation of the controller very complex. This fact is called 'explosion of complexty ' since the complexity grows exponentially as the system dynamic order increases. The proposed adaptive neural control scheme adopt the backstepping design procedure only for determining ideal control law and employ only one neural network to approximate the finally selected ideal controller, which makes the controller design procedure and stability analysis considerably simple compared to the previously proposed controllers. It is shown that all the time-varing signals containing tracking error are stable in the Lyapunov viewpoint.

• Journal of Korean Academy of Nursing Administration
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• v.9 no.1
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• pp.41-49
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• 2003

Purpose : This study was to illuminate the main characteristics and limits of the feminine ethics of care when it applies to the nursing ethics, and suggested sufficient conditions of care ethics in nursing in order to actualize the autonomy for nurses. Method : This study inquired the relationship between the ethical trait of caring in nursing and Gilligan & Noddings's moral theory as feminine ethics in relation to supporting the nursing ethics. In contrast to traditional moral theories based on universal principles, Gilligan's moral theory emphasized the conscious of the interpersonal relationship on the basis of the empathy and the responsibility for the other's need in contextual situations, and Noddings developed her ethics based on mothering as a model for the caring relation, the moral feature of which was characterized as reciprocity, receptiveness and responsiveness. Result : The feminine ethics of care came to support nursing ethics considering the nterpersonal relationship and responsibility. However, it did not show a possible ideal of nursing ethics because it has some difficulties in actualizing the nurse's individual and professional autonomy in the health care system. Conclusion : Therefore, in order that ethics of care can be an ideal and universal nursing ethics, it should be studied in proper direction, that is, toward actualization of the autonomy of the universal ethical self in relation to the concern and responsibility for the other.

• The Journal of the Korea institute of electronic communication sciences
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• v.13 no.4
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• pp.737-744
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• 2018

The RSA cryptosystem is a one of the first public-key cryptosystems and is widely used for secure data transmission and electric signature. The security of the RSA cryptosystem is based on the difficulty of factoring large numbers.. Though many studies on finding methods for factoring large numbers are going on, the results of that are all experimental or probabilistic. We, in this paper, construct an algorithm for finding large prime factors of integers without factoring integers using properties of the structure of semigroup of imaginary quadratic order and non-invertible ideal, then propose our methods foe deterministic attack against RSA cryptosystem.

• Journal of Auto-vehicle Safety Association
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• v.15 no.3
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• pp.27-33
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• 2023

Electric vehicles are widely produced from many car manufacturers around the world instead of internal combustion engine vehicle in order to respond a variety of environmental regulations. Also, they are applying for modular design method to develop plenty of the vehicles. And, both of these two issues will be an important trend to lead the future global automobile industries for a long time. In this paper, new brake architecture concept is proposed in order to respond to such a situation. First, physical interfaces between brake system like caliper, disc and other counter-parts are established for modular assembly. Second, we analyze effective factors of brake system for electric vehicles which need to reflect vehicle specifications such as total vehicle weight. Here, we consider ideal brake force by critical deceleration. Third, we simulate accumulated regenerative brake energy for two main driving modes to confirm to effectiveness for a variety of Electric Vehicle. Finally, we hope that it contributes to implement brake architecture for the development of Electric Vehicle platform through such a study.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.11 no.2
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• pp.257-264
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• 2007

In order to obtain a fine picture, a camera has many convenient functions. Its representative functions are Auto Focus(AF), Auto White Balance(AWB) and Auto Exposure(AE). In this paper, we present the new algorithm of Auto Exposure control system, one of its useful functions The proposed algorithm of Auto Exposure control system is based on IIR Filter with Variable Time Constant. First, in order to establish the standards of exposure control, we compare change of the picture luminance with luminance of an object in the Zone system. Second, we make an ideal characteristic graph of luminance by using the results. Finally, we can find the value of the right exposure by comparing an ideal characteristic graph of the luminance with the value of the current expose of a scene. We can find an appropriate exposure as comparing the ideal characteristic graph of the luminance with current exposure of a scene. In order to find a suitable exposure state, we make use of IIR Filter instead of a conventional method using micro-controller. In this paper, the proposed system has therefore simple structure, we use it for compact image sensor module used in the handheld device.

• Nuclear Engineering and Technology
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• v.44 no.7
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• pp.755-766
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• 2012

A Binary Decision Diagram (BDD) is a graph-based data structure that calculates an exact top event probability (TEP). It has been a very difficult task to develop an efficient BDD algorithm that can solve a large problem since its memory consumption is very high. Recently, in order to solve a large reliability problem within limited computational resources, Jung presented an efficient method to maintain a small BDD size by a BDD truncation during a BDD calculation. In this paper, it is first identified that Jung's BDD truncation algorithm can be improved for a more practical use. Then, a more efficient truncation algorithm is proposed in this paper, which can generate truncated BDD with smaller size and approximate TEP with smaller truncation error. Empirical results showed this new algorithm uses slightly less running time and slightly more storage usage than Jung's algorithm. It was also found, that designing a truncation algorithm with ideal features for every possible fault tree is very difficult, if not impossible. The so-called ideal features of this paper would be that with the decrease of truncation limits, the size of truncated BDD converges to the size of exact BDD, but should never be larger than exact BDD.

• Journal of the Daesoon Academy of Sciences
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• v.25_2
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• pp.71-102
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• 2015

In this paper, this author studied the realization of Daesoonjinri's Haewon Sangsaeng(解冤相生) in this world, for instance discussed the meaning of Daesoonjinri's Haewon Sangsaeng, a world construction with Haewon Sangsaeng, its practical action for the realization of Haewon Sangsaeng, and so forth. A description of the contents is as follows. Daesoonjinri's Haewon Sangsaeng eliminates the resentment of human destiny, and provides the grounds that we peoples can live with, going to help each other. And then the realization of Daesoonjinri's Haewon Sangsaeng in this world will require us to this society. Really Sangje(上帝) wanted to perform it in this world, and has performed it with a reorganizing in the order of heaven and the earth(天地公事). In response to the deeper sublimest will of Sangje, we humans can not help but do as follows: When Sangje has done a reorganizing in the order of heaven and the earth, we humans should participate in it. This is our response to the will of Sangje who wants to build an ideal society in this world. And in oder to participate in a reorganizing in the order of heaven and the earth, we humans should look up Sangje with Sincerity(誠), Reverence(敬), and should practice the words of Sangje with Faith(信). This kind of thing is a route that we should avoid Jeokwon Sanggeuk(積怨相克) and should perform Haewon Sangsaeng. This Haewon Sangsaeng can be achieved with no Chuck(無慼), an altruistic, no greed(無慾), an execution of asceticism(修道), and the practice of Podeok (布德)·Rehabilitation(敎化). No making of a Chuck, doing an altruistic, no greed, an execution of asceticism would not deceive others, would not murder others, would not blame the transgressions of others, would not discriminate, would not harm others. And Podeok·Rehabilitation should be performed well in practice. When performing Podeok and Rehabilitation, we should not nullify them as unjust words or undue actions, and we must be a true. Because we must make the words of Sangje inform a world wide well, and must convince the words of Sangje to peoples so that they can adhere to them with a faith. That's the way that we humans should participate in a reorganizing in the order of heaven and the earth in this current world, and the way that we should contribute to building the ideal society in the world.

• KSII Transactions on Internet and Information Systems (TIIS)
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• v.10 no.4
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• pp.1904-1926
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• 2016

Iris recognition for biometric personnel identification has gained much interest owing to the increasing concern with security today. The image quality plays a major role in the performance of iris recognition systems. When capturing an iris image under uncontrolled conditions and dealing with non-cooperative people, the chance of getting non-ideal images is very high owing to poor focus, off-angle, noise, motion blur, occlusion of eyelashes and eyelids, and wearing glasses. In order to improve the accuracy of iris recognition while dealing with non-ideal iris images, we propose a novel algorithm that improves the quality of degraded iris images. First, the iris image is localized properly to obtain accurate iris boundary detection, and then the iris image is normalized to obtain a fixed size. Second, the valid region (iris region) is extracted from the segmented iris image to obtain only the iris region. Third, to get a well-distributed texture image, bilinear interpolation is used on the segmented valid iris gray image. Using contrast-limited adaptive histogram equalization (CLAHE) enhances the low contrast of the resulting interpolated image. The results of CLAHE are further improved by stretching the maximum and minimum values to 0-255 by using histogram-stretching technique. The gray texture information is extracted by 1D Gabor filters while the Hamming distance technique is chosen as a metric for recognition. The NICE-II training dataset taken from UBRIS.v2 was used for the experiment. Results of the proposed method outperformed other methods in terms of equal error rate (EER).