정지현 교수

This report describes a delay-weight-sum beamforming method especially applied to hearing-aids with microphone arrays. There are many design parameters such as an aperture size, the number of microphones, and a microphone arrangement which can affect the performance of the hearing-aid. However, in this paper, the aperture size and the number of microphones were simply set to 10 cm and less than four microphones for the frequency range of between 300 Hz and 3000 Hz considering the practicality. T

Ethnic unrest within Chinas borders is commonly linked to problems of regional underdevelopment, yet ethnic minority issues have rarely been examined in the context of the PRCs regional economic development plans. What is the political logic of Chinas development in terms of minority policy? What resources are distributed, and where are they allocated? Here, I attempt to answer these questions in light of the Western Development Plan (WDP, xibudakaifa), Chinas largest regional development plan t

Model sizes have increased significantly in the fields of engineering and scientific computation. Some additional computing devicessuch as GPU, accelerators and co-processors have been applied to improve the computation performance. This paper presents severalstrategies to optimize the computation performance. The first strategy is to combine a computation unit with multiple of 4-tetrahedrons tosupport AVX vectorization. The second strategy is to utilize a GPU device. Several techniques are prop

The present study aims to examine the effects of early English reading programs utilizing multiple intelligence (MI) theory on underachieving elementary school students’ English reading proficiency. For this purpose, twelve 5th grade English underachievers were selected and taught basic phonics, sight words, major words and sentences for 13 weeks. An experimental group and a control group were composed based on similar strong multiple intelligence tendency and reading abilities, but MI-based act

컨테이너의 신속한 이송 및 처리는 작업시간 단축에 의한 비용절감을 의미하므로 항만에서는 가능한 작업효율을 향상시키기 위해 다양한 노력이 추진되고 있다. 1990년대 중반부터 RMGC 및 RTGC 등의 크레인이 개발되어 컨테이너 이송 및 적재를 위한 필수장비로 널리 이용되고 있다. 특히 RTGC는 타이어 구동방식이므로 주행환경에 크게 제약을 받지 않는 장점도 있으나, 타이어 슬립, 타이어에 의한 샤시의 기울어짐 등 설정된 경로를 고정도로 주행해야 하는 목적달성에 장애가 되는 요인도 많아 레일 위를 주행하는 RMGC에 비해 자동화가 용이하지 않다. 이것은 무인 RTGC 시스템 구축을 어렵게 하는 가장 큰 요인이 되어 이와 관련한 기술개발 또한 미비한 수준에 이르고 있다. 따라서 본 논문에서 RTGC의 무인자동화에 있어서 가장 기초단계라고 볼 수 있는 수학적 모델링을 기반으로 한 고정도 주행제어기를 설계하고자 한다. 먼저 제어대상인 RTGC의 주행에 따른 운동특성을 분석하여 모델링을 수행

In the semiconductor wafer cleaning, ammonium hydroxide based APM (ammonium peroxide mixture) has been widely used to remove particles and organic contaminants [. However as the film thickness and line width of semiconductor structure scales down rapidly, the material losses by etching reaction of alkaline chemicals can cause serious problem in yield loss due to electric failure. The presence of H 2 O 2 could enhance the material loss on silicon wafer. Very dilute alkaline chemicals might be of

Two kinds of Ag-pastes were prepared for integrating the bulk Si solar cell. One is the Ag-paste mixed with Pb-based glass frit and the other is that mixed with Pb-free glass frit. The major components in the silver paste were 84 wt% Ag, 2 wt% glass frit, 11 wt% solvent of buthyl-cabitol acetate, and 2 wt% the other additives. After fabricating the Ag-pastes, they were coated on the SiN x /n + /p - stacks of a commercial mono-Si substrate. The solar cell efficiency was 17.6% in case of the silve

Abstract: The most important thing in the container terminal is to handle the cargo effectively in the limited time. To achieve this object, many strategies have been introduced and applied to. If we consider the technical trends and environment of the automated container terminal, it is necessary that the systems for cargo handling are equipped with more intelligent control technologies. To cope with this tendency, from the middle of the 1990's, the automated RMGC (Rail-Mounted Gantry Crane) an

International Women’s Day, 2015 was marked by a clash between women’s rights organizations and the state in China, drawing academic attention to research on state feminism in the PRC. This article argues an inherent conflict exists between the goal of the Chinese Communist Party to maintain power, the goals of the All-China Women’s Federation and the needs and realities of the women’s rights movement in China. It traces the development of the alliance between the Chinese Communist Party and the

This study presents a comprehensive thermo-structural and modal analysis of a ball screw assembly. Thermal analysis revealed a maximum temperature of 29.1 °C at the ball nut, corresponding to a total rise of 7.1 °C above ambient. The resulting thermal deformation reached 77.81 μm, while the von Mises stress peaked at 53.9 MPa, both within acceptable limits. Modal simulation of 360 modes showed a sharp increase in frequency with mode number and larger deformation patterns at the higher modes. The