• Journal of the Institute of Convergence Signal Processing
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• v.3 no.1
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• pp.67-73
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• 2002

This paper presents a new design method of optimal continuous deadbeat controller by using second-order smoothing elements. The continuous deadbeat controller is made of a serial integral compensator and a local feedback compensator introduced into the state feedback loop. The decision method of the damping factor and the natural angular frequency of the smoothing element is described. A numerical example is given to show how well input-output characteristics are improved. Especially according to the variable input and disturbance, corresponding CDBC design method is suggested. By computer simulations, control inputs and system outputs are shown to have desirable property such as smoothness.

• Journal of the Institute of Convergence Signal Processing
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• v.3 no.4
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• pp.62-66
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• 2002

An attempt of using SOCMAC neural network for the prediction of a nonlinear sequence, which is generated by Mackey-Glass equation, is reported. The ,report shows the SOCMAC can handle a system with multi-dimensional continuous inputs, which has been considered very difficult, if not impossible, task to be implemented by a CMAC neural network because of a huge amount of memory required. Also, an improved training method based on the variable receptive fields is proposed. The Performance ranged somewhere around those of TDNN and BP neural networks.

• Proceedings of the KIEE Conference
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• 1999.07g
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• pp.3117-3119
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• 1999

In this paper, a new phase detector which can detect phase difference of variable input frequency and represent as a DC voltage is designed. The proposed phase detector has detection range from $-180^{\circ}$ to $180^{\circ}$. It is implemented by digital electronic circuit. It operates from 125 kHz to 4 MHz frequency of input signal and it's maximum phase error is $360/256^{\circ}$.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.8 no.5
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• pp.1069-1075
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• 2007

New BESA cryptographic algorithm is suitable network environment and wire/wireless communication network, on implement easy, security rate preservation, scalable & reconfigurable. Though proposed algorithm strengthens security vulnerability of TCP/IP protocol and keep security about many user as that have authentication function in network environment, there is important purpose. So that new BESA cryptographic algorithm implemented by hardware base cryptosystem and en/decryption is achieved at the same time, composed architecture.

• Proceedings of the KIPE Conference
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• 2014.07a
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• pp.179-180
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• 2014

서버용 전원장치는 경부하 조건에서의 효율이 점점 강조되고 있다. 이를 만족하기 위해 LLC 공진형 컨버터는 많이 사용되고 서버용 전원장치에서 요구되는 홀드-업 시간을 만족하기 위하여 넓은 입력 전압 범위에서 동작 가능하게 설계되어 있다. 이는 컨버터의 1차측 도통 손실과 턴-오프 스위칭 손실을 증가시켜 정상상태의 효율을 감소시킨다. 본 논문에서는 변압기의 보조 권선을 포함한 제어 회로를 통해 변압기의 인덕턴스를 변경하는 방식을 하프브리지 LLC 공진형 컨버터에 적용함으로써 정상 상태에서는 높은 자화인덕턴스를 적용하고 홀드-업 시간에서 낮은 자화인덕턴스를 적용하여 각각의 상태에서 요구되는 고효율과 최대 전압이득을 모두 만족 한다. 실험을 통해 제안된 방식의 유용성을 검증한다.

• Korean Journal of Optics and Photonics
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• v.12 no.5
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• pp.401-405
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• 2001

We propose a novel channel-switching transmission filter using segmented chirped fiber Bragg gratings (CFBG's) each of which has separate transmission bands in the reflection spectrum of the CFBG. The segmented CFBG's are made by using specially designed slits. The separated reflection spectral bands of the segmented CFBG's are controlled by the attached fiber stretchers, and the controlled reflection bands are used to choose the channels independently. Tunability of the transmission spectra is experimentally demonstrated in WDM transmission experiments.

• Annual Conference on Human and Language Technology
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• 2019.10a
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• pp.115-119
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• 2019

딥러닝 모델은 자동으로 자질을 추출하고 추상화 하기 위해 깊은 은닉층을 가지며, 이전 연구들은 이러한 은닉층을 깊게 쌓는 것이 성능 향상에 기여한다는 것을 증명해왔다. 하지만 데이터나 태스크에 따라 높은 성능을 내는 깊이가 다르고, 모델 깊이 설정에 대한 명확한 근거가 부족하다. 본 논문은 데이터 셋에 따라 적합한 깊이가 다르다고 가정하고, 이를 확인하기 위해 모델 내부에 분류기를 추가하여 모델 내부의 학습 경향을 확인하였다. 그 결과 태스크나 입력의 특성에 따라 필요로 하는 깊이에 차이가 있음을 발견하였고, 이를 근거로 가변적으로 깊이를 선택하여 모델의 출력을 조절하여 그 결과 성능이 향상됨을 확인하였다.

• Journal of the Korean Institute of Telematics and Electronics S
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• v.35S no.11
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• pp.144-151
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• 1998

In this paper, it is applied the analysis properties of mathematical morphology in order to process MIN/MAX operation on the basis of combination of predefined and weighted structuring element to FCNN having the structure of CNN combined with fuzzy logic between template and input/output. In this paper, as the fuzzy estimator is applied to the image including noise, thus it could be found the noise removal as well as the edge detection in the process of computer simulation. We could analyze and compare the results of edge detection using FCNN, CNN and median filter to which the erosion operation of morphology is applied. This paper could apply the static template and the variable template to FCNN using the quantization fuzzy function, in result we could confirm that the performance of FCNN got to improve in the process of computer simulation.

• Journal of the Institute of Electronics Engineers of Korea CI
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• v.46 no.3
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• pp.77-85
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• 2009

Execution times of tasks can be variable depend on input data. If we choose a high performance processor to satisfy the worst case execution times, the hard cost becomes high and the energy consumption also becomes large. To apply a lower performance processor, we have to utilize processor capacity maximally while overrunning tasks can not affect deadlines of other tasks. To be used for such systems, this paper presents SBP (Shared Bandwidth Partitioning) that a processor bandwidth is reserved and shared among all tasks. If a task needs more processor capacity, it can use a portion of the shared bandwidth. A simulation result shows that SBP provides better performance than previous algorithms. SBP reduces deadline miss ratio which is related to scheduling quality. And the number of context switches, which is related to system overhead, is also reduced.

• Journal of the Korean Society for Aeronautical & Space Sciences
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• v.41 no.7
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• pp.539-546
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• 2013

Surge phenomenon can be occurred in a compressor when compressor performance of turbofan engine for an aircraft is changed considerably in a short time on the cases like take-off phase and changing of RPM from idle to maximum, because performance of aircraft engine is changed suddenly. This study is aimed to avoid surge in a compressor. Dynamic simulation in a compressor is modeled by simulink in specific condition. Fuel flow is control input, rpm and air mass flow are expressed in terms of transfer function. Surge margin is obtained by using compressor performance map from NPSS. VIGV(Variable Inlet Guide Vane) is controlled by PD controller with difference between surge margin and reference. Finally this paper verifies IGV can prevent surge phenomenon in a compressor.