• The KIPS Transactions:PartA
• /
• v.13A no.3 s.100
• /
• pp.267-274
• /
• 2006

This paper describes a method to achieve different level of detail for the given volumetric data by assigning weight for the given data points. The relation between wavelet transformation and alpha shape was investigated to define the different level of resolution. Scattered data are defined as a collection of data that have little specified connectivity between data points. The quality of interpolant in volumetric trivariate space depends not only on the distribution of the data points in ${\Re}^3$, but also on the data value (intensity). We can improve the quality of an approximation by using wavelet coefficient as weight for the corresponding data points.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
• /
• 2005.11a
• /
• pp.200-204
• /
• 2005

The use of beamforming method and de-Dopplerization technique was applied in studying the rotating sound sources. Acoustic analysis of a moving sound source required that the measured sound signals be do-Dopplerized and restored as of the original emission signals. Two main issues of the signal reconstruction in time domain are addressed herein: First, to remove Doppler effect from the measured data and to restore the original emission data of the moving source. The difference of the time domain beamforming from the frequency domain beamforming was mentioned. Also, the time domain beamforming method is deployed in the test and the comparisons were made to the frequency domain results. The time domain signal reconstruction was numerically simulated prior to the application. To validate the de-Dopplerization Performance, the rotating Point sources were examined and localized by the use of a phased array of microphone. The application of prop-rotor was conducted in a hovering condition. The results of reconstructing time signals of rotating sources and its locations were shown in the power distribution maps. In the prop-rotor measurements, the acoustic source locations were successfully verified in varying positions for different frequencies of interest.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.16 no.6 s.111
• /
• pp.565-573
• /
• 2006

Acoustic analysis of a moving sound source required that the measured sound signals be do-Dopplerized and restored as of the original emission signals. The purpose of this research is development of beamforming technique can be applied to the rotor noise source identification. For the do-Dopplerization and reconstruction of emitted sound wave, Forward Propagation Method is applied to the time domain beamforming technique. And validation test were performed using rotating sound source constructed by bended pipe and horn driver. In the validation test using sinusoidal sound wave, sufficient performance of signal processing can be seen, and the effect of measuring duration for accuracy was compared. In the prop-rotor measurements, the acoustic source locations were successfully verified in varying positions for different frequencies and collective pitch angle, in hover condition.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2008.11a
• /
• pp.349-352
• /
• 2008

Thrust vectoring control by injection of secondary jet inside a convergent-divergent supersonic nozzle was studied by both experimentally and computationally. For various stagnation pressure of the secondary jet injected at a specific location(12 mm-downstream of throat) in the divergent section of nozzle, the characteristics of thrust vectoring were observed. Present numerical results were compared with previous investigators' results and Schlieren flow visualizations for the identical boundary conditions, and it showed a qualitatively good agreement. It was also noticed that the characteristics of thrust vectoring is strongly related to the reflection structure of oblique shock inside nozzle, ie., the pressure ratio of the secondary jet, SPR.

• Proceedings of the Korean Society of Propulsion Engineers Conference
• /
• 2012.05a
• /
• pp.318-323
• /
• 2012

This study is conducted to scrutinize agitation effects of an ultrasonic standing wave on the dynamic behavior of methane/air premixed flame. The propagating flame is caught by high-speed schlieren images, through which flame front and local flame velocity are analyzed and obtained, too. It is revealed that the propagation velocity with ultrasonic standing wave is larger than the case without excitation except around the flammability limits. Also, vertical locations of distortions and depth of dents of the front are constant, unless the ultrasonic standing wave characteristics are not changed.

• Journal of the Korean Society for Geothermal and Hydrothermal Energy
• /
• v.15 no.3
• /
• pp.7-13
• /
• 2019

To improve the flow distribution at channel locations in the welded plate heat exchanger with "L"-type inflow, the flow visualization of Model 1 was carried out. Besides, the characteristics of flow distribution was investigated experimentally according to the header shape. The inlet flow rate for each channel location was increased at the side channels but decreased at the central channels. In the case of Model 2, which has a slant structure added to the basic header of Model 1, the unevenness of inlet flow increased by 23% from 0.019 to 0.023 as compared to Model 1. On the other hand, Model 3, which has a baffle structure added to Model 2, showed 0.064 unevenness in inlet flow, which was a 36% reduction one compared to Model 1. To improve the distribution at each channel in the welded plate heat exchanger with "L"-type flow, it is necessary to improve the header external shape for the guide of flow as well as the baffle structure for reduction of vortex flow.

• Proceedings of the Korea Information Processing Society Conference
• /
• 2009.04a
• /
• pp.988-991
• /
• 2009

게놈 데이터의 지속적인 증가로 인해 생물정보학에서 유전체 정보를 체계적으로 저장하고 열람하는 효과적이고 효율적인 시스템을 확립하는 것은 중요한 일이다. 잘 알려진 게놈 정보의 계층적 구조처럼 우리는 게놈의 내부 구조를 연구하기 위한 우수한 툴도 필요하다. 게놈 연구에 있어서 한 가지 문제는 유전체 정보는 너무 거대해서 표준적인 정보 처리를 이용하는 간단한 툴로는 작업하기 어려운 점이다. 예를 들어 특정 게놈 데이터 크기는 100메가 바이트를 넘는다. 추가적으로 유전자, promoters, retro-elements(HERV), operons, exon-introns와 같은 많은 게놈 요소들이 있다. 전통적으로 생물학자 들은 게놈 연구를 위해 툴을 아무거나 사용하지 않고, 보통 그들의 연구에 좋은 툴을 채택하려 노력했다. 게놈 연구에서 기본적이고 주시할만한 단계는 다른 종과 유전체 요소를 비교하기 위해 위치를 인식할 수 있도록 하나의 화면에 모든 게놈 데이터를 시각화하는 것이다. 생물학자에게 툴의 개발은 많은 시간이 걸리고 시행착오를 겪기 쉬운 일이다. 이 논문에서 우리는 전체 게놈 중 어떤 게놈 요소를 시각화하는 컴포넌트 웨어의 셋을 제안한다. 그리하여 실험을 목적으로 생물학자를 만나서 우리의 셋을 이용하여 컴포넌트를 조합하여 소프트웨어를 만드는 것은 비교적 간단한 작업이다. 이 실험에서 우리는 HERV와 연동되는 게놈 요소를 보여주는 툴을 어떻게 우리의 컴포넌트 웨어를 간단히 조합하여 구축하는지를 보여주겠다.

• 한국벤처창업학회:학술대회논문집
• /
• 2021.11a
• /
• pp.125-128
• /
• 2021

한국은 2025년 전체 인구 중 65세 이상 인구가 20%을 상회하는 초고령 사회 진입이 전망되면서 노화수준에 맞는 고령친화적인 제품서비스 공급이 요구된다. 특히 시니어 소비자가 사용하기 편리한 인터페이스를 갖춘 서비스가 필요하다. 이에 시니어들은 노화(aging)에 대한 문제의식에 비용을 지불하며 젊은 소비자들과 유사한 소비행태를 보이고, 노화 수준별 건강 유지 및 건강 불안, 돌봄 공백, 사회적 고립 증가 등 사회문제가 복합적으로 심화되면서 고령친화적인 스마트한 Aging Service 공급이 요구된다. 이러한 시기와 맞물려 with코로나시대 시니어 소비자가 사용하기 편리한 인터페이스를 갖는 제품·서비스로 4차 산업혁명의 중심인 AI(Artificial Intelligence)와 정보통신 기술의 노력이 가시화되고 있다. 따라서 IT 기술에 덧입혀 시니어들의 욕구에 부합하는 AI 음성인식 기능을 탑재한 제품 및 서비스가 향후 고령친화산업 성장을 주도할 것으로 전망된다. 이에 본 연구는 '고령친화 AI 음성 O2O 서비스'의 서비스 가치가 태도와 이용의도에 영향을 미치는가를 분석하기 위해 선행이론을 토대로 전문가 델파이 방법을 통해 고령친화 AI 음성 O2O 서비스의 정의를 도출하고 실증분석으로 '고령친화 AI 음성 O2O 서비스'의 서비스가치(상황기반 제공성, 즉시연결성, 위치정확성)와 태도 및 이용의도간의 인과관계를 조사하기 위해 본 연구를 진행하였다.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.19 no.2
• /
• pp.467-472
• /
• 2024

Multiple sequence alignment (MSA) is a method of collecting and aligning multiple protein sequences or nucleic acid sequences that perform the same function in various organisms at once. clustalW, a representative multiple sequence alignment algorithm using BioPython, compares the degree of alignment by column position. In addition, a web logo and phylogenetic tree are created to visualize conserved sequences in order to improve understanding. An example was given to confirm the differences between humans and other species, and applications of BioPython are presented.

• Journal of the Korea Academia-Industrial cooperation Society
• /
• v.17 no.2
• /
• pp.299-306
• /
• 2016

In this paper, a method of shape prediction of an endoscope handling robot that can imitate a surgeon's behavior using a sensor network is suggested. Unit sensors, which are composed of a 3-axis magnetometer and 3-axis accelerometer pair comprise the network through CAN bus communication. Each unit of the sensor is used to detect the angle of the points in the longitudinal direction of the robot, which is made from a flexible tube. The signals received from the sensor network were filtered using a low pass Butterworth filter. Here, a Butterworth filter was designed for noise removal. Finally, the Euler angles were extracted from the signals, in which the noise was filtered by the low path Butterworth filter. Using this Euler angle, the position of each sensor on the sensor network is estimated. The robot body was assumed to consist of links and joints. The position of each sensor can be assumed to be attached to the center of each link. The position of each link was determined using the Euler angle and kinematics equation. The interpolation was carried out between the positions of the sensors to be able to connect each point smoothly and obtain the final posture of the endoscope in operation. The experimental results showed that the shape of the colonoscope can be visualized using the Euler angles evaluated from the sensor network suggested and the shape of serial link estimated from the kinematics chain model.