FlexRay 네트워크 시스템을 위한 FIBEX 자동 생성 알고리즘에 관한 연구

박지호,이석,이경창,Park, Ji-Ho,Lee, Suk,Lee, Kyung-Chang 대한임베디드공학회 2013 대한임베디드공학회논문지 Vol.8 No.2

As vehicles become more intelligent for safety and convenience of drivers, in-vehicle networking systems such as controller are network (CAN) have been widely used due to increasing number of electronic control unit (ECU). Recently, FlexRay was developed to replace CAN protocol in chassis networking systems, to remedy the shortage of transmission capacity and unsatisfactory real-time transmission delay of conventional CAN. However, it is difficult for vehicle network designers to calculate platform configuration registers (PCR) and determine a base cycle or slot length of FlexRay. To assist vehicle network designers for designing FlexRay cluster, this paper presents automatic field bus exchange format (FIBEX) generation algorithm from CANdb information, which is de-facto standard database format for CAN. To design this program, structures of FIBEX, CANdb and relationship among PCR variables are analyzed.

공진모델을 이용한 3상 능동전력필터의 강인한 내부모델제어

박지호,김영빈,노인배,우정인 동아대학교 생산기술연구소 2002 生産技術硏究所硏究論文集 Vol.7 No.1

A new simple control method for active power filter, which can realize the complete compensation of harmonics is proposed. In the proposed scheme, a model-based digital current control strategy is presented. The Proposed control system is designed and implemented in a form referred to as Internal Model Control structure. In the proposed control algorithm, overshoots and oscillations due to the computation time delay is prevented by explicit incorporating of the delay in the controller transfer function. In addition, a new compensating current reference generator employing resonance model implemented by a DSP(Digital Signal Processor) is introduced. Resonance Model has an infinite gain at resonant frequency, and it exhibits a band-pass filter. Consequently, the difference between the instantaneous load current and the output of this model is the current reference signal for the harmonic compensation.

통계로 본 한국농업의 어제와 오늘

박지호 한국종자연구회 2013 종자과학과 산업 Vol.10 No.3

CuBr 반도체 양자구슬에서의 Hole Burning 현상

박지호,박성욱,김일곤,유동선 昌原大學校 基礎科學硏究所 2002 基礎科學硏究所論文集 Vol.14 No.-

PSHB spectrum was measured by the pump-probe method. After the absorption band of the nanocrystals sample was excited by the spectrally narrow band light, the spectral hole was produced at the position of the exciting light. The depth of spectral holes(main hole and side hole) was decreased with the temporal change. The energy difference between the zero phonon line and side hole depends on the radius of nanocrystals.

Leveraging the Biological Transport to Improve Cancer Nanomedicine

박지호 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.1

홀센서가 장착된 보행보조기 스마트 핸들 설계 연구

박지호,김수언,이원구 제어로봇시스템학회 2018 제어로봇시스템학회 국내학술대회 논문집 Vol.2018 No.5

특징벡터의 상관관계에 의한 한글 단모음 음성인식에 관한 연구

박지호,김중규 成均館大學校 科學技術硏究所 1994 論文集 Vol.45 No.2

본 논문에서는 통계적 처리에 의한 한글 단모음 인식 판별법을 제시하려고 한다. 본 논문에서 제시하는 새로운 음성 판별 방법은 기존의 알고리즘에서 요구되는 긴 학습시간과 많은 수행단계, 그리고 인식시의 대용량 메로리에 비해 짧은 수행 시간과 함께 높은 인식률을 동시에 보장할 수 있다. 본 연구에서는 음성 파형과 그 음성의 특징 파라미터를 음성과 화자의 특징을 포함하는 Random Process로 가정하고, 단모음의 경우 각 프레임에서 음성 파형 및 LPC계수, LPC계수 Spectrum과 같은 특징 파라미터들이 거의 일정하다는 것에 착안하여, 각 음성 파형에서 나오는 평균 LPC log spectrum을 모음별로 구분하여 그 평균들로 기준 패턴을 만든다. 또, 각 음성파형의 특징파라미터를 Ramdom Process로 가정하여 그 평균들로 기준 패턴을 만든다. 또, 각 음성파형의 특징파라미터를 Ramdom Process로 가정하고 입력파형의 평균 LPC log spectrum과 기준 패턴 Set의 Vector 들간의 Ramdom Correlation Coefficient를 각각 구한 후 그중 가장 큰 Correlation Coefficient값을 갖는 기준 Vector에 의한 음성을 입력신호의 음성으로 인식한다. 이러한 판별법은 성도모델이 정확히 나타나고 빠른 추출이 가능한 LPC Parameter를 기반으로 하고 또한 Distance measure, 즉 Correlation Coefficient를 계산하는데 걸리는 시간이 매우 짧기 때문에 기존의 방법에 비해 전체적인 Processing Time을 훨씬 더 줄일 수 있을 것이다. 본 실험에서는 새로운 알고리즘을 검증하기 위하여 9명의 화자가 3번식 발음한 단모음 8개의 Data를 사용하였으며 화자독립 음성인식의 경우 96.30%, 화자종속 음성인식의 경우 100%의 인식률을 보였다. In this paper, we propose a statistical recognition algorithm for isolated words and applied it to Korean vowels. The proposed scheme requires relatively short processing time with reasonably high performance, compared to existing conventional algorithms which need rather longer period of training as well as much larger capacity of memory. In this research, we assume that the speech waveform and associated feature parameters are random processes, and we form the reference pattern of each speech with the mean LPC log spectrum averaged over the frames. This is feasible since the speech waveform of Korean vowels can be considered stationary over the duration of signals. Then, we compute the correlation coefficient between the feature parameters (i.e. the LPC log spectrum) of the input speech and those of reference vectors, and choose the speech signal among reference patterns which renders the highest correlation with the input as the recognized vowel. Since this method is based on the LPC parameters which provide an accurate model of vocal tract and can be extracted very quickly from the speech waveform, and since the computation time required for the distance measure (i.e. the correlation coefficient) is fractional, the overall processing time for recognition could be very much shortened. We tested the proposed algorithm with eight Korean vowels spoken by nine male speakers three times each, and showed 96.3% recognition rate for speaker independent case and 100% for speaker dependent case respectively.

Effect of Ultrasonic Energy on Self-Weight Consolidation of Clay Minerals

박지호,천영우,Hoang Tien Trung,김영욱 대한토목학회 2014 KSCE JOURNAL OF CIVIL ENGINEERING Vol.18 No.4

Consolidation is the densification of soft saturated soils occurring when water is extruded from the soil. Because water flows slowly through porous media, consolidation is time intensive. We investigated the effect of ultrasonic energy on the self- weight consolidation of clay minerals, with a series of laboratory tests in which a sonic bath directly generated ultrasonic waves at the clay slurry. The test conditions included the power and duration of the sonic energy, the initial water content, and the soil type. The results showed a significant reduction in consolidation time when ultrasound is applied. The time required for the same amount of settlement is shorter for the sonicated specimens, and the sonicated clay slurry had a much-increased final settlement. The degree of enhancement varied with the test conditions. A scanning electron microscope was used to monitor possible changes in the soil structure during the tests. The ultrasound did not significantly affect the soil structure, but density the layers of particles. Using the test results, we discuss the potential development of a new method that can reduce the construction period.

슬라이딩 관측기를 이용한 유도전동기의 센서리스 제어

우정인,조용길,신동률,박지호 東亞大學校 附設 情報通信硏究所 1999 情報通信硏究所論文誌 Vol.7 No.1

In this paper, the robust vector control method of Induction Motor for the purpose of improving the system performance deterioration caused by parameter variations is proposed. The full order state observer estimates the stator surrent and the rotor flux by using the state prediction of state variables. And, the motor speed is estimated without without speed using the full order state observer. Also, the parameter variation is compensate by the Sliding Observer. By using this method, speed sinsorless control and current contol with no affection of the parameter variation can be obtained simultaneously.

파라메타 변동에 강인한 유도전동기의 센서리스 벡터제어

우정인,김동완,김춘삼,박지호 東亞大學校 大學院 1999 大學院論文集 Vol.24 No.-

본 논문에서는 파라메타의 변동에 기인한 유도전동기의 성능저하를 개선하기 위한 강인한 센서리스 벡터제어를 제안한다. 동일차원 상태관측기를 구성하여 고정자전류와 회전자자속을 추정하고, 추정된 고정자전류와 회전자자속을 이용하여 속도 동정기를 구성한 후 회전자의 속도를 추정하여 Deadbeat 전류제어를 수행한다. 또한, 회전자속도의 추정에서 고정자전류 오차는 가변극배치 동일차원 상태관측기에 의해서 보상되며, 회전자자속 오차는 고정자전류를 입력으로 하고 회전자자속을 출력으로 하는 모델을 설정하여 이 모델에 파라메타 변동에 강인한 슬라이딩 관측기로 구성된 회전자자속 관측기를 부가한다. 이 회전자자속 관측기에서 회전자자속의 지령치와 추정값 사이의 오차를 보상하므로써 속도 동정기에 강인성을 부여하고, 정확한 Deadbeat 전류제어의 상태예측을 수행한다.