• 인지과학
• /
• 제25권2호
• /
• pp.91-107
• /
• 2014

음절 빈도 효과란 고빈도 음절로 시작되는 단어가 저빈도 음절로 시작되는 단어에 비해 어휘 판단 속도가 느리며 어휘 판단 오류율도 증가하는 효과를 의미한다. 이 효과를 유발하는 원인은 전체 단어 수준에서 활성화된 음절 이웃 단어의 방해로 알려져 있으며 이 방해의 크기는 표적 단어가 얼마나 많은 음절 이웃 단어를 또는 얼마나 강력한 음절 이웃 단어를 가지고 있는지에 의해 결정된다. 그러나 음절 빈도의 정의가 음절 타입 빈도와 토큰 빈도로 구분됨에도 불구하고 이를 구분하지 않고 많은 연구들이 수행되어 왔다. 최근 Conrad, Carreiras, & Jacobs(2008)에 따르면 음절 토큰 빈도는 전체 단어 처리 수준을 반영하는 변인이며 음절 타입 빈도는 하위 어휘 처리 수준의 음절 처리 수준을 반영하는 변인일 수 있다고 주장하였다. 이에 본 연구는 이들의 주장이 맞다면 음절 타입 빈도는 단어 명명 속도를 촉진 시킬 것이며 반대로 음절 토큰 빈도는 명명 시간과 관련 없을 것이라고 예측하였다. 왜냐하면 표기 심도가 얕고 음절의 경계가 명확한 언어에서 명명 과제는 전체 단어수준을 덜 참고하기 때문이었다. 실험 1결과에서 음절 토큰 빈도를 통제한 상태에서 고빈도 타입음절의 단어 명명 시간은 유의미하게 짧았다. 실험 2에서 음절 타입 빈도를 통제한 상태에서 음절토큰 빈도의 증가는 명명 시간을 역시 단축시켰다. 이에 본 연구는 음절 토큰 빈도가 하위 어휘 처리와 무관하다는 Conrad, Carreiras, & Jacobs(2008)의 주장을 반박하였다.

• 조명전기설비학회논문지
• /
• 제28권3호
• /
• pp.32-43
• /
• 2014

This paper presents the intra capacitance modeling according to the winding method, section bobbin and coil structure for hybrid choke coil capable of the EMI attenuation of broad bands from lower frequency bands to higher frequency bands and high frequency type common-mode choke coil capable of the EMI attenuation of high frequency band used in the EMI Block of LED-TV SMPS. In case of high frequency type CM choke coil, it can be explained the parasitic capacitance of A type and section bobbin type winding methods among them is much smaller than the other. The first resonant frequency of the proposed CM choke coil tends to increase as the parasitic capacitance becomes small and its impedance characteristics also show improved performance as the first resonant frequency increases. In case of hybrid choke coil using rectangular copper wire, it has investigated its parasitic capacitance compared to CM choke coil of conventional toroidal type becomes small. Also it has confirmed through the experiment results that CE margin and RE margin in frequency bands 0.5MHz to 5MHz and 30MHz to 200MHz are respectively 10dB and 15dB greater than that of conventional type in case of one stage EMI filter structure adopting hybrid choke coil compared to two stage EMI Filter structure using two of each CM choke coil used in the lower and higher frequency bands or two of CM choke coil used in only the lower frequency bands. In the future, the hybrid choke coil and CM choke coil of high frequency type show it can be practically used in not only LED/LCD-TV SMPS but also several applications such as LED Lighting, Laptop Adapter, Server Power Supply and so on.

• 한국재료학회지
• /
• 제21권7호
• /
• pp.403-409
• /
• 2011

Micro speakers are used to reproduce sound in small electric and information and communications devices, such as cellular phones, PMPs, and MP3 players. The acoustical properties and sound quality, which are changed due to the decreased size of the speaker, are often adjusted varying the type and thickness of the diaphragm. The most widely used diaphragm material is thin polymer. It was previously reported by the author of this paper that the resonance frequency of a micro speaker is changed by the type and thickness of a polymer diaphragm. In this paper, the frequency response near the resonance frequency of a micro speaker was studied as functions of the type and thickness of the polymer diaphragm. While $R_{max}$ and $R_{DC}$ were affected by the type and thickness, an analysis of the electrical impedance curve revealed that $R_o(= R_{max}/R_{DC})$ and ${\Delta}f$ were not changed. Thus, $Q_{TS}$ which was function of $R_o$, ${\Delta}f$, and the resonance frequency, is only related to the resonance frequency. The increase of the resonance frequency led to a proportional rise of $Q_{TS}$. The change of the frequency response near the resonance frequency was not dependent on the type or thickness of the polymer diaphragm, but was affected by the resonance frequency.

• 한국의류산업학회지
• /
• 제6권2호
• /
• pp.221-228
• /
• 2004

The purpose of this study was to compare somatotypes from various classification methods, to analyze the interrelation among each somatotype or each high frequency type, and to suggest the basis to interpret body size and shape more accurately. As a sample, the subjects were 97 Korean females between 18 and 24 years old. They were measured both anthropometric and photographic measuring in November, 1999. Their somatotypes were classified by three kinds of classification methods. The first method was based on the lateral view of body, the second involved Factor and Cluster analysis with the photographic measurements of anterior and lateral body, and the third involved Factor and Cluster analysis with the anthropometric measurements of whole body. The upper body was classified into three types, and the lower body was classified into 6 types from the lateral view of body. The bend-forward/q-2 was found to be the 'High-frequency type from the lateral view of body', and the Straight/n-1 was found to be the 'Straight type from the lateral view of body'. From the classification by the analysis of photographic measurements, the anterior body was classified into three types, the lateral was classified into 4 types. The X/${\varepsilon}$ type was found to be the 'High-frequency type from the analysis of photographic measurements of anterior and lateral body'. From the classification by the analysis of anthropometric measurements, the whole body was classified into three types. The i type was found to be the 'High-frequency type from the analysis of anthropometric measurements of whole body'. The significant interrelation was certified among some somatotypes or some High-frequency types. We found that both the view of body and the statistical analysis would make the clear definition of each somatotype possible. In order to certify the representativeness of High-frequency type, further analysis would be required of subjects who were in the High-frequency type and their body parts were in the High-frequency range.

• 한국전기전자재료학회논문지
• /
• 제22권8호
• /
• pp.641-644
• /
• 2009

We have studied on the microwave characteristics for the meander type inductors on the MgO substrates and $Al_2O_3$ substrates by employing 3-D high frequency simulation, respectively. Proper designs of meander type inductors were proposed and confirmed through the high frequency simulations, 5, 7, 9, 11, and 13 turns meander type inductors have been choose to analyze the electrical properties for the microwave passive component applications. The Al top electrodes have 282 nm length, 45 nm width, 100 nm thickness and 15 nm gap. The simulations were carried out from 50 MHz to 30 GHz, Frequency dependent inductances and quality factor were calculated by employing the equivalent circuit model of meander type inductors. The self resonances frequency of meander type inductor were shifted from high frequency to low frequency range as the number of the turn of inductors was increased. From the microwave simulations, the inductances and quality factors of meander type inductors were extracted through the scattering parameter.

• 한국산학기술학회논문지
• /
• 제9권4호
• /
• pp.918-923
• /
• 2008

본 논문에서는 전극들이 동일한 평면상에 놓이고, Gap에 의하여 유전간격을 형성한 새로운 구조의 임베디드 캐패시터(EC)를 제안하였다. 제안된 EC의 이름을 Gap type EC라고 하고, 유한요소법으로 그 특성을 평가하였다. Cap type EC의 공진주파수는 기존의 EC에 비하여 고주파 대역으로 이동되었다. 또한 공진주파수는 전극의 크기와 두께에 따라 변화되었다. Gap type EC는 Gap size가 $50{\mu}m$일 때 $55pF/cm^2$의 정전용량을 나타내었다. 이 값은 기존의 EC가 나타내는 $25pF/cm^2$에 비하여 높은 값이다. 따라서 본 논문에서 제안한 Gap type EC는 고주파 디커플링 용도로 충분히 사용될 수 있을 것이다.

• 전력전자학회논문지
• /
• 제19권1호
• /
• pp.8-14
• /
• 2014

This paper presents the intra capacitance modeling according to the winding method and section bobbin for CM choke capable of the EMI attenuation of broad bands from lower frequency bands to higher frequency bands and high frequency type common-mode choke capable of the EMI attenuation of high frequency band used in the EMI Block of LED-TV SMPS. In case of high frequency type CM choke, it can be explained the parasitic capacitance of A type and section bobbin type winding methods among them is much smaller than the other. The first resonant frequency of the proposed CM choke tends to increase as the parasitic capacitance becomes small and its impedance characteristics also show improved performance as the first resonant frequency increases. In the future, the CM chokes of high frequency type show it can be practically used in not only LED/LCD-TV SMPS but also several applications such as LED Lighting, Adapter and so on.

• 한국전자파학회논문지
• /
• 제21권4호
• /
• pp.399-407
• /
• 2010

SC-FDMA(Single Carrier-Frequency Division Multiple Access)는 DFT(Discrete Fourier Transform)-spreading 방식을 사용하여 OFDM(Orthogonal Frequency Division Multiplexing) 신호의 PAPR(Peak to Average Power Ratio) 저감하여 전력효율을 향상시키는 방식이다. 그러나, PAPR을 저감하기 위하여 블록 type 파일럿을 사용하기 때문에 이동 환경에 따른 도플러 주파수와 송수신기 사이의 주파수 불일치로 인한 주파수 옵셋과 시간 도메인에서의 위상 잡음으로 주파수 도메인에서 ICI(Inter Channel Interference)가 발생하여 SC-FDMA 시스템의 성능은 저감된다. 그러므로 이동 환경 및 위상 잡음을 제거하기 위하여 comb type 파일럿을 고려하고, 이에 대한 PAPR을 감소시키기 위하여 SLM(Selective Mapping) 기법을 사용하며, 효과적인 채널 추정 및 ICI 제거를 위한 기법을 제안한다. 그러므로 기존 블록 type에 비해 comb type을 사용함으로써 이동 수신 성능이 향상될 수 있으며 효과적으로 주파수 옵셋 및 위상 잡음을 효과적으로 제거 가능함을 보인다.

• 한국태양에너지학회:학술대회논문집
• /
• 한국태양에너지학회 2009년도 추계학술발표대회 논문집
• /
• pp.371-376
• /
• 2009

The Power Conditioning System is Power Transfer System which make array DC current to the Grid sinusoidal current. These are Low Frequency Transformer Inverter Type, High Frequency Transformer Inverter Type and Transformer-less Type. Low Frequency Transformer Type has a Excellent Isolation property, but doesn't have competitiveness in Size and Cost. Also High Frequency Transformer Type has a good Isolation property but there are many steps in Power transfer Switching. Nowadays, Transformer-less Type inverter change a transformer to DC/DC Converter which is small and cost effective. In this paper shown the DC/DC Converter Transformer-less Type multi-string inverter design and simulation. The Control Algorithm will be introduced and Simulation was accomplished.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2002년도 추계학술대회 논문집
• /
• pp.375-378
• /
• 2002

In this paper, the frequency response separation scheme is proposed for high scanning speed and simple structure of non-contact type of AFM. A self-sensing cantilever is attached on the actuator for detect the atomic force between tip and the media surface. VCM or PZT are used for actuator. This paper presents the method to simplify the actuator structure and the performance of each actuator for non-contact type AFM. Based on the frequency response separation scheme, the only one actuator plays roles 1311owing low frequency surface and modulating self-sensing cantilever tip in contrast with convention non-contact type AFM. 10 ${\mu}{\textrm}{m}$ standard grid sample imaged to verify proposed scheme. This result shows the possibility simplifying the actuator structure and reducing cost of non-contact type AFM.