• ETRI Journal
• /
• v.39 no.3
• /
• pp.398-405
• /
• 2017

In this paper, an artificial stereo extension method that creates stereophonic sound from a mono sound source is proposed. The proposed method first trains deep neural networks (DNNs) that model the nonlinear relationship between the dominant and residual signals of the stereo channel. In the training stage, the band-wise log spectral magnitude and unwrapped phase of both the dominant and residual signals are utilized to model the nonlinearities of each sub-band through deep architecture. From that point, stereo extension is conducted by estimating the residual signal that corresponds to the input mono channel signal with the trained DNN model in a sub-band domain. The performance of the proposed method was evaluated using a log spectral distortion (LSD) measure and multiple stimuli with a hidden reference and anchor (MUSHRA) test. The results showed that the proposed method provided a lower LSD and higher MUSHRA score than conventional methods that use hidden Markov models and DNN with full-band processing.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
• /
• 2012.10a
• /
• pp.355-356
• /
• 2012

Recently, Digital clothing techniques using computer graphics to reappear clothes are activated in fashion area and Researches incorporating fashion flows and 3D techniques are frequently progressed. In fashion industry, Using smartphone can make successful result by catching a change of trend and adding an emotional factor. Conventional 3D fitting services are only provided in store or internet sites installed avatar system, virtual mirror. This study suggests a fashion fitting service system saving time and oneself by using I-phone in consumers' position. In this system, Companies can market their product easily to consumers, consumers can choose various product and check their fitness.

• Journal of the Society of Cosmetic Scientists of Korea
• /
• v.31 no.3 s.52
• /
• pp.253-257
• /
• 2005

Assurance of the objectivity and reproducibility is a major key point in wrinkle measurement used for evaluating the degree of skin aging. The measurement of relief is quickly converted to a non-contact method, of which tools or instruments do not come in contact with skin directly, to minimize the artificial effects which influence the shape or depth of the relief. Here, we showed how wrinkle measurement techniques have been changed briefly and compared PRIMOS and replica method in the point of view of measurement principle and features, the former is non-contact fringe projection tool and the latter is contact type of the method.

• The Journal of Korean Institute of Communications and Information Sciences
• /
• v.35 no.4C
• /
• pp.408-414
• /
• 2010

When we are collecting traffic information on CCTV images, we have to install the detect zone in the image area during pan-tilt system is on duty. An automation of detect zone with pan-tilt system is not easy because of machine error. So the fisheye lens attached camera or convex mirror camera is needed for getting wide area images. In this situation some troubles are happened, that is a decreased system speed or image distortion. This distortion is caused by occlusion of angled ray as like trembled snapshot in digital camera. In this paper, we propose two methods of de-blurring to overcome distortion, the one is image segmentation by nonlinear diffusion equation and the other is deformation for some segmented area. As the results of doing de-blurring methods, the de-blurring image has 15 decibel increased PSNR and the detection rate of collecting traffic information is more than 5% increasing than in distorted images.

• Journal of the Korean Institute of Intelligent Systems
• /
• v.17 no.4
• /
• pp.569-574
• /
• 2007

최근 많은 광대역 유무선 통신 응용분야에서 OFDM(Orthogonal Frequency Division Multiplexing) 방식을 표준기술로 채택하고 있다. OFDM 방식의 고속 무선 데이터 통신을 위한 FFT 프로세서는 일반적으로 DSP(Digital Signal Processing)로 구현되었으나, 큰 전력 소비를 필요로 한다. 따라서, OFDM 통신방식의 단점인 전력문제를 보완하기 위해서 전류모드 FFT LSI가 제안되었고, 저소비전력 전류모드 FFT LSI를 동작시키기 위해서는 전류모드를 전압모드로 바꾸는 VIC(Voltage to Current Converter) 그리고 다시 전류모드를 전압모드로 바꾸어 주는 IVC(Current to Voltage Converter)가 필요하다. 그러나, OP-AMP로 구현되는 종래의 IVC는 회로규모가 크고, 전력소비가 크며, LSI 내에 크고 정확한 높은 저항을 필요로 한다. 또한 전류모드신호처리에서 많이 이용되는 Current Mirror 회로 등의 출력단자로부터 전류신호를 입력받은 경우, 입력단자간의 전위차가 발생하며, DC offset 전류가 발생하는 등의 문제점을 갖는다. 따라서 본 연구에서는 저전력 동작이 가능하고, 향후, single chip 응용이 가능한 IVC를 $0.35{\mu}m$ 공정에서 설계함으로서, $0.35{\mu}m$ 공정에서의 전류모드 FFT LSI의 전압모드 출력이 가능해졌다 설계된 IVC는 FFT LSI의 출력이 디지털신호로 환산한 ${\pm}1$인 점을 감안하여, 전류모드 FFT LSI의 출력이 $13.65{\mu}A$ 이상일 때에 3.0V의 전압을 출력하고, FFT LSI의 출력이 $0.15{\mu}A$ 이하일 때에 0.5V 이하의 전압을 출력하도록 하였으며, IVC의 총 소비전력은 약 1.65mV이하로 평가되었다.

• Transactions of the Korean Society of Automotive Engineers
• /
• v.6 no.6
• /
• pp.132-141
• /
• 1998

Particle image velocimetry(PIV), a planar measuring technique, is an efficient tool for studying the complicated flow field such as in-cylinder flow, and intake port flow. PIV can be also used for analyzing the integral length scale of turbulence, which is a measure of the size of the large eddies that contain most of the turbulence kinetic energy. In this study, dual color scanning PIV was designed and demonstrated by using a rotating mirror and a beam splitter. This PIV system allowed enlargement of flexibility in the intensity of vectors to be calculated by spatial filtering technique, even in combustion chamber with high velocity gradient and high vorticity$({\sim}1000s^{-1})$. A new color image processing algorithm was developed, which was used to find the direction of particle movement directly from the digital image. These measuring techniques were successfully applied to obtaining the turbulence intensity (~0.1m/s) and the turbulent integral length scale of vorticity(~1mm).

• Journal of the Korea Convergence Society
• /
• v.10 no.2
• /
• pp.175-182
• /
• 2019

China, more than any other countries in the world shared similar ideological system with Korea historically. That is confucian patriarchy, which later combined with socialism and capitalism respectively. Therefore, the hardship that modern chinese women had to go through in the course of great social changes would provide meaningful cross cultural insights in various women issues in Korea. Thus this study attempts to focus on Ding Ling, who is considered to be one of the first women that brought the feminism up in China. One of her early works, and from Yan'an days were analyzed to mirror current feminist movement.

• Journal of the Korea Fashion and Costume Design Association
• /
• v.26 no.3
• /
• pp.113-127
• /
• 2024

The purpose of this study is to analyze expression characteristics and directing effects for the use of technology in stage costumes and to explore future directions by comparing technology fashion. To this end, the study first investigates technology fashion and identifies its expression characteristics through previous research. Second, it examines the use of technology in stage costumes and studies expression characteristics and directing effects through cases. Third, by comparing technology fashion with stage costumes, it explores future directions for integrating technology into stage costume design. Study methods, include a literature review accompanied by a case study. The findings are as follows: First, the expression characteristics of technology fashion is that digital technology is applied to variable molds according to interaction with the wearer to virtually realize the fluid dematerialization of fashion. Second, the expression characteristics of stage costumes using technology mirror those of technology fashion. However, the visual information expressed through the use of technology was maximized by harmonizing with various stage arts the stage space was expanded to a virtual space. Third, as a result of comparing each other, there is a difference in the objects that cause interaction, so efforts of technology development are required so stage costumes can interact with the performers' acting.

• Journal of the Institute of Electronics Engineers of Korea SC
• /
• v.40 no.1
• /
• pp.19-29
• /
• 2003

This paper proposes a CMOS readout circuit for uncooled micro-bolometer arrays adopting a four-point step calibration technique. The proposed readout circuit employing an 11b analog-to-digital converter (ADC), a 7b digital-to-analog converter (DAC), and an automatic gain control circuit (AGC) extracts minute infrared (IR) signals from the large output signals of uncooled micro-bolometer arrays including DC bias currents, inter-pixel process variations, and self-heating effects. Die area and Power consumption of the ADC are minimized with merged-capacitor switching (MCS) technique adopted. The current mirror with high linearity is proposed at the output stage of the DAC to calibrate inter-pixel process variations and self-heating effects. The prototype is fabricated on a double-poly double-metal 1.2 um CMOS process and the measured power consumption is 110 ㎽ from a 4.5 V supply. The measured differential nonlinearity (DNL) and integrat nonlinearity (INL) of the 11b ADC show $\pm$0.9 LSB and $\pm$1.8 LSB, while the DNL and INL of the 7b DAC show $\pm$0.1 LSB and $\pm$0.1 LSB.

• Journal of the HCI Society of Korea
• /
• v.12 no.1
• /
• pp.5-13
• /
• 2017

Interactive intervention of the human presenter is one of the important factors that make the visualization more effective. Rather than just showing the content, the presenter enhances the process of the information delivery by providing the context of visualization. In this paper, we define this as an augmented presentation. In augmented presentation concept, the presenter can facilitate presentation more actively by being fully immersed in the visualization space and reaching and interacting into digital information. In order to concrete the concept, we design presentation space that enables the presenter to be seamlessly immersed in the visualization. Also we increase the presenter's roles as a storyteller, controller and augmenter allowing the presenter to fully support communicative process between the audience and the visualization. Then, we present an augmented presentation system to verify the proposed concept. We rendered 3D visualization through a half-mirror film and a wall projection screen that are place in parallel and applied with stereoscopic images, then, spatially align the presenter inside the virtual visualization space. After that, we conduct a controlled experiment to investigate the subjective level of immersion and engagement of the audience to HoloStation compared to traditional presentation system. Our initial investigation suggests that the newly conceived augmented presentation has potential not only to enhance the information presentation but also to supports the delivery of visualization.