• 대한전기학회논문지
• /
• 제37권10호
• /
• pp.733-739
• /
• 1988

Adaptive controllers for linear system whose nominal values of coefficients only are known, that is corrupted by disturbance, are designed by signal synthesis model reference adaptive control (MRAC). This design is stemmed from the Lyapunov direct method. To reduce the model following error and to improve the conrergence rate of the design, an indirect suboptimal control law is de rived using the Hamilton Jacobi Beellman equation. Proper compensaton for the effects of time varying coefficients and plant disturbance are suggested. In the design procedure no complete identification of unknown coefficients are required.

• Journal of Photoscience
• /
• 제9권2호
• /
• pp.338-340
• /
• 2002

In broom sorghum, Sorghum bicolor Moench, UV causes anthocyanin synthesis having action peaks in UVA and UVB regions. We previously reported that UV induces anthocyanin synthesis through UVB photoreceptor and phytochrome activated by UV. Furthermore, UVA and UVB amplify phytochrome-induced anthocyanin synthesis (PIAS). Our action- spectroscopic research indicated that a UV -receptor for amplification of PIAS is likely to be the same or same type of UVB photoreceptor for induction of anthocyanin synthesis. UVA-amplification of PIAS can be explained by the action of a cryptic red light signal (CRS), an amplification factor for PIAS produced by a distinct phytochrome-species activated by UVA. We suggest that UVA photoreceptors are not involved in anthocyanin synthesis in the broom sorghum.

• 한국산학기술학회논문지
• /
• 제7권6호
• /
• pp.1175-1179
• /
• 2006

유성음원과 무성음원을 사용하는 음성부호화 방식에 있어서, 프레임 안에 모음과 무성자음이 있는 경우에 음성 파형에 일그러짐이 나타난다. 본 논문에서는 LMS를 적용한 새로운 TSIUVC 근사합성법을 제시하였다. 실험결과, LMS를 적용하여 양호한 TSRIVC 근사합성 파형을 얻을 수 있었으며, 오차신호가 일그러짐이 적은 근사합성 파형에 중요한 역할을 한다는 것을 알 수 있었다. 이 방법은 음성합성, 음성분석, 새로운 Voiced/Silence/TSIUVC의 음성부호화 방식에 활용할 수 있을 것으로 기대된다.

• BMB Reports
• /
• 제32권2호
• /
• pp.196-202
• /
• 1999

The existence of the Ras-independent signal transduction pathway of insulin leading to DNA synthesis was investigated in Rat-1 fibroblasts overexpressing human insulin receptor (HIRc-B) using the single-cell microinjection technique. Microinjection of a dominant-negative mutant $Ras^{N17}$ protein into quiescent HIRc-B cells inhibited the DNA synthesis stimulated by insulin. Microinjection of oncogenic H-$Ras^{V12}$ protein ($H-Ras^{V12}$) (0.1 mg/ml) induced DNA synthesis by 35%, whereas that of control-injected IgG was induced by 20%. When the marginal amount of oncogenic H-$Ras^{V12}$ protein was coinjected with a dominant-negative mutant of the H-Ras protein ($Ras^{N17}$), DNA synthesis was 35% and 74% in the absence and presence of insulin, respectively. This full recovery of DNA synthesis by insulin suggests the existence of the Ras-independent pathway. The same recovery was observed in the cells coinjected with either H-$Ras^{V12}$ plus H-$Ras^{N17}$ plus SH2 domain of the p85 subunit of PI3-kinase ($p85^{SH2-N}$) or H-$Ras^{V12}$ plus H-$Ras^{N17}$ plus interfering anti-Shc antibody. When co-injected with a dominant-negative H-$Ras^{N17}$, the DNA synthesis induced by the Ras-independent pathway was blocked. These results indicate that the Ras-independent pathway of insulin leading to DNA synthesis exists, bypassing the p85 of PI3-kinase and Shc protein, and requires Rac1 protein.

• 융합신호처리학회 학술대회논문집
• /
• 한국신호처리시스템학회 2000년도 하계종합학술대회논문집
• /
• pp.65-68
• /
• 2000

In this paper, as a compatible software radio transmission system, Digital-Radio conversion system which can directly change the digital signal generated by the logic circuit into radio signal is proposed. By the vector synthesis method, the digital signals can change directly into radio signal. If such a circuit is realized, RF circuit and an antenna can be composed by the simple one device, and the radio is directly controlled and performed by the software processing which is the essence of software radio. This Digital-Radio conversion system of this paper give many number of communication channels being offered by PN code and offer a hardware design flexibility by digitization, therefore it decrease the percentage ratio of hardware of system and give a more flexible function of software basis. In this paper, this proposed Digital-Radio conversion system is called D/R converter, and the principle of this D/R converter, radio signal generation algorithm is explained and the performance characteristics of proposed algorithm is shown in time base by the computer simulation method.

• 제어로봇시스템학회:학술대회논문집
• /
• 제어로봇시스템학회 2003년도 ICCAS
• /
• pp.413-418
• /
• 2003

In this paper, a new multirate optimal finite impulse response (FIR) filter is proposed for the signal reconstruction in the nosy filter bank systems. The multirate optimal FIR filter replaces the conventional synthesis filters and the Kalman synthesis filter. First, the generic linear model is derived from the multirate state space model for an autoregressive (AR)input signal. Second, the multirate optimal FIR filter is derived from the multirate generic linear model using the minimum variance criterion. This paper also provides numerical examples and results. The simulation results illustrate that the performance is improved compared with conventional synthesis filters and the proposed filter has advantages over the Kalman synthesis filter.

• 한국음향학회지
• /
• 제20권2호
• /
• pp.44-51
• /
• 2001

본 연구에서는 능동소나와 관련된 시스템에 적용가능한 잠수함 수중표적의 표적강도 및 신호형태를 예측하는 반사신호 합성모델을 제안한다. 이는 입사각에 따라 외부헐로 하이라이트의 위치가 변하는 UTAHID (Underwater TArget by Highlight Distribution) 모델을 기초로 하여 잠수함 내부의 복잡한 형상에 의한 반사점들을 산란자운에 의한 구룹화된 하이라이트군으로 변형을 가하여 반사신호를 합성한다. 제안된 모델은 입사신호의 펄스길이 변화에 따른 표적강도 변화특성 및 합성신호 파형, 시간분산손실, 신장효과 등에 대해 분석하였으며, 이는 능동소나, 음향대항, 감시 시스템과 같이 반사신호 합성에 관련된 여러가지 실시스템에 적용이 가능하다.

• 한국음향학회지
• /
• 제14권3호
• /
• pp.49-60
• /
• 1995

본 논문은 소규모 시스템에 적용 가능한 한국어 문자-음성 변환 시스템의 설계 및 구현에 대한 연구를 목적으로 한다. 본 논문에서 채택한 음성합성 방법은 파라메터 합성법으로서 LPC(linear Predictive Coding)계열의 PARCOR(PARtial autoCORrelation) 계수를 음향 파라메터로 사용하였으며, 음성합성 단위로는 가장 기본적인 단위인 음소를 채택하였다. 합성 파라메터로는 유성음의 경우 PARCOR계수, 피치, 진폭을 무성음의 경우 잔차신호와 PARCOR계수를 사용하였다. 특히 무성음의 경우 LPC합성시 음질이 떨어진다는 단점이 있었으나, 본 논문에서는 LPC분석시 얻어지는 잔차신호를 무성음의 여기신호로 사용하여 단어 단위의 합성에서 60%의 이해도를 얻을 수 있었다. 합성결과 단어 단위의 합성에 적용 가능하였고, 문장단위의 합성을 위해서는 음소 지속시간 조절에 대한 연구가 진행되어야 할것이다. 본 논문의 구현환경으로는 486 PC상에서 음성의 입,출력을 위해 70[Hz]-4.5[KHz] 대역통과 필터와 증폭기, 그리고 TMS320C30 디지털 신호처리 프로세서를 장착한 DSP 보드를 사용하였다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2002년도 하계종합학술대회 논문집(4)
• /
• pp.369-372
• /
• 2002

In this paper, we present an improved TTS synthesis system using articulatory synthesis and concatenative synthesis. In concatenative synthesis, segments of speech are excised from spoken utterances and connected to form the desired speech signal. We adopt LPC as a parameter, VQ to reduce the memory capacity, and TD-PSOLA to solve the naturalness problem.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2007년도 하계종합학술대회 논문집
• /
• pp.409-410
• /
• 2007

In this paper, we propose a new method for overlap and add synthesis using phase shaping factor in a sinusoidal synthesis method of speech signal, which improves continuity and SNR(Signal Noise Ratio) efficiency of synthesized speech.