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Acoustic focusing headphone based on delay-and-sum beamforming
Jeein Noh,Hyun Jo,Youngjin Park,Youn-sik Park 제어로봇시스템학회 2010 제어로봇시스템학회 국제학술대회 논문집 Vol.2010 No.10
A novel headphone system with microphone arrays was proposed whose objective is to boost forward sound signal, by doing so people can communicate well with a speaker during headphone playback. The main purpose of this research is to boost the sound signal from the front, particularly for a speech signal (300Hz~3kHz). A delay-andsum beamforming method is applied to an end-fire microphone array to make a proposed headphone system. Three design parameters, i.e. an aperture size, the number of microphones, and a microphone arrangement of microphone arrays are decided based on performance of beamformer with respect to each parameter. To compare the performance regarding to each design parameter, a performance measure, efficiency, was defined as ratio of two resultant sound pressures between a forward and a backward direction. A sound scattering from a head of listener is modeled by using spherical head-related transfer function (HRTF). By changing an aperture size of a microphone array, 8 cm microphone array is thought to be proper when the efficiency in speech frequency range was considered. The use of four microphones is expected as the optimum by considering both good efficiency and reducing the number of microphones. By fixing the number of microphones and an aperture size of microphone array, the efficiency was calculated in various arrangements of microphones. As a result, microphone arrangement with inter-microphone spacing of decreasing interval is selected. The design parameters such as an aperture size, the number, and an arrangement of microphones can be changed regarding to a target frequency range or a direction wanted to be boosted, and the proposed methodology can be applied similarly.
박지인(Jeein Park),이경수(Kyongsu Yi) 대한기계학회 2007 대한기계학회 춘추학술대회 Vol.2007 No.5
This paper describes a robust model-based roll state estimator for application to the detection of impending vehicle rollover. The roll state estimator is based on a 2-D bicycle model and a roll model to estimate the maneuver-induced vehicle roll motion. The measurement signals are lateral acceleration, yaw rate, steering angle, and vehicle speed. Vehicle mass is adapted to obtain robust performance of the estimator. Computer simulation is conducted to evaluate the proposed roll state estimator by using a validated vehicle simulator. It is shown that the roll state estimator shows robust performance without exact vehicle mass information.
주의집중기질, 실행기능 및 마음이론이 유아의 자기조절학습능력에 미치는 영향
정지인(Jeein Jeong) 인지발달중재학회 2022 인지발달중재학회지 Vol.13 No.1
연구목적: 본 연구는 유아의 자기조절학습 능력의 발달 양상을 살펴보고, 주의집중기질, 실행기능 및 마음 이론이 자기조절학습 능력에 미치는 영향력을 살펴보기 위해 진행되었다. 연구방법: 만 3세에서 6세 유아 91명의 인지, 동기, 정서, 친사회적 조절을 포함하는 자기조절학습 능력은 교사가 평정하고, 유아의 주의집중 기질은 어머니 평정으로 측정하였다. 또한 연구자와 유아 간의 일대일 면담을 통해 실행기능과 마음이론 능력을 측정하였다. 연구결과: 연령이 증가함에 따라 자기조절학습 능력 전반과 실행기능, 마음이론 이해가 증가하였으며, 이들 변수들은 연령에 의한 효과를 통제한 후에도 서로 관련이 높은 것으로 나타났다. 유아의 연령과 성별을 통제하면서 모든 변수를 투입한 결과, 실행기능이 자기조절학습능력을 예측하는 것으로 나타났다. 결론: 유아기에 아동의 자기조절학습 능력이 전반적으로 증가하며, 유아의 실행기능 발달을 돕는 것이 자기조절학습 능력의 발달에 중요한 영향을 미칠 것으로 볼 수 있다. Objective: This study aimed to examine the development of young children’s self-regulated learning, and how it is affected by attentional focusing, executive function, and theory of mind. Methods: Ninety-one children aged from three to six participated in the study. Children’s self-regulated learning ability was rated by teachers, and their attentional focusing temperament was rated by their mothers. Children’s executive function and theory of mind were assessed through one-on-one interviews between each child and a researcher. Results: Children’s executive function, theory of mind, and self-regulated learning increased with their age. Their relationships among them were significant even when controlling for age. Children’s executive function predicted their self-regulated learning ability when all other variables were considered, with age and gender controlled. Conclusions: Children’s self-regulated learning ability increases in early childhood, and their executive function plays a pivotal role in their development.