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Group-based speaker embeddings for text-independent speaker verification (문장 독립 화자 검증을 위한 그룹기반 화자 임베딩)

  • Jung, Youngmoon;Eom, Youngsik;Lee, Yeonghyeon;Kim, Hoirin
    • The Journal of the Acoustical Society of Korea
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    • v.40 no.5
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    • pp.496-502
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    • 2021
  • Recently, deep speaker embedding approach has been widely used in text-independent speaker verification, which shows better performance than the traditional i-vector approach. In this work, to improve the deep speaker embedding approach, we propose a novel method called group-based speaker embedding which incorporates group information. We cluster all speakers of the training data into a predefined number of groups in an unsupervised manner, so that a fixed-length group embedding represents the corresponding group. A Group Decision Network (GDN) produces a group weight, and an aggregated group embedding is generated from the weighted sum of the group embeddings and the group weights. Finally, we generate a group-based embedding by adding the aggregated group embedding to the deep speaker embedding. In this way, a speaker embedding can reduce the search space of the speaker identity by incorporating group information, and thereby can flexibly represent a significant number of speakers. We conducted experiments using the VoxCeleb1 database to show that our proposed approach can improve the previous approaches.

Design of a DMA Controller for Augmented Reality in Embedded System (증강현실을 위한 임베디드 시스템의 DMA 컨트롤러 설계)

  • Jang, Su Yeon;Oh, Jung Hwan;Yoon, Young Hyun;Lee, Seong Mo;Lee, Seung Eun
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.23 no.7
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    • pp.822-828
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    • 2019
  • An Augmented Reality(AR) provides virtual information with a real environment, and the processor needs to access the memory for the AR system. However, the processor has the heavy workload as the technology improvement leads to increase the size of data. We need a specific module to reduce the workload to overcome the limitation. In this paper, we propose a Direct Memory Access(DMA) controller displaying image instead of the processor. We implemented the proposed DMA controller on a Field Programmable Gate Array(FPGA) and demonstrated the functionality of the DMA controller based on an Avalon Memory Mapped(Avalon-MM) interface. Also, the DMA controller is fabricated by using Magnachip/Hynix 0.35um CMOS technology and verified the feasibility of the embedded system.

Big Data Processing and Monitoring System based on Vehicle Data (차량 데이터 기반 빅데이터 처리 및 모니터링 시스템)

  • Shin, Dong-Yun;Kim, Ju-Ho;Lee, Seung-Hae;Shin, Dong-Jin;Oh, Jae-Kon;Kim, Jeong-Joon
    • The Journal of the Institute of Internet, Broadcasting and Communication
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    • v.19 no.3
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    • pp.105-114
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    • 2019
  • As the Industrial Revolution progressed, Big Data technologies were used to develop a system that instantly identified the consequences of older vehicles using mobile devices. First, data from the vehicle was collected using the OBD2 sensor, and the data collected was stored in the raspberry pie, giving it the same situation that the raspberry pie was driving. In the event that vehicle data is generated, the data is collected in real time, stored in multiple nodes, and visualized and printed based on the processed, refined, processed and processed data. We can use Big Data in this process and quickly process vehicle data to identify it effectively through mobile devices.

Comparison of Greenhouse Gas Emission from Construction Equipment by Tier 2 and Tier 3 Methodologies (건설기계의 Tier 2와 Tier 3 방법론에 의한 온실가스 배출량 비교)

  • Shin, Yong Il;Kim, Jeong;Kim, Pil Su;Chung, Chan Kyo;Jang, Young Kee
    • Journal of Climate Change Research
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    • v.1 no.1
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    • pp.13-20
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    • 2010
  • Recently, the operation of construction equipments have increased by many construction project. So a respectable amount of greenhouse gas is expected from construction equipments. But the greenhouse gas emissions from construction equipment have been high uncertainty due investigation of a lack of activity data and emission factors in Korea. In this study, annual greenhouse gas emissions from construction equipment are estimated by IPCC's Tier 2 and Tier 3 method. These methods require emission factors, fuel consumption, average kilowatts and operating hours. As the results, the nationwide emission from construction equipments by Tier 2 and Tier 3 are calculated as $21,784kton-CO_2eq/year$ and $22,811kton-CO_2eq/year$ in 2008.

Making of View Finder for Drone Photography (드론 촬영을 위한 뷰파인더 제작)

  • Park, Sung-Dae
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.22 no.12
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    • pp.1645-1652
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    • 2018
  • A drone which was developed first for military purpose has been expanded to various civil areas, with its technological development. Of the drones developed for such diverse purposes, a drone for photography has a camera installed and is actively applied to a variety of image contents making, beyond filming and broadcasting. A drone for photography makes it possible to shoot present and dynamic images which were hard to be photographed with conventional photography technology. This study made a view finder which helps a drone operator to control a drone and directly view an object to shoot with the drone camera. The view finder for drones is a type of glasses. It was developed in the way of printing out the data modelled with 3D MAX in a 3D printer and installing a ultra-small LCD monitor. The view finder for drones makes it possible to fly a drone safely and achieve accurate framing of an object to shoot.

On the development of S/W tools for industrial 3D X-ray computed tomography employing general software (범용 소프트웨어를 사용한 산업용 3차원 X-ray Computed Tomography의 툴 개발)

  • Choi, Hyeong-Seok;Yang, Yoon-Gi
    • Journal of IKEEE
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    • v.23 no.3
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    • pp.768-776
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    • 2019
  • With the deployment of 4-th generation industrial revolution, the computer based manufacturing technologies employing advanced IT technology are much more popular than any other past years. In this research, some novel S/W technologies related to the industrial X-ray CT (computed tomography) for the inspection of the industrial parts are introduced. First, newly constructed industrial X-ray CT is presented in this paper, where some basic principles and functions of the CT are described. Then some research platforms are developed to generate more advanced functionalities of the industrial CT. Especially, the data transform from CT to general S/W such as Matlab is conducted. And based on this techniques, some supplementary S/W platform such as GUI (graphical user interface) of the CT S/W and some 3D voxel based image processing technologies can be developed in this paper. The industrial CT is one of the rare research items and it's values can be much more enhanced when it is used with advanced IT technologies.

A Study on the Development of a Variable Speed Diesel Generator for DC Distribution (직류배전용 가변속 디젤발전기 개발에 관한 연구)

  • Park, Kido;Kim, Jongsu
    • Journal of the Korean Society of Marine Environment & Safety
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    • v.25 no.1
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    • pp.117-121
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    • 2019
  • In this study, research and a demonstration for applying DC distribution systems to ships as an environmental and energy conservation solution in domestic and foreign countries were actively carried out. In order to apply a generator to a DC distribution system, a variable speed engine was used. Both engine speed and fuel consumption were reduced. In this paper, a DC generator for DC distribution was constructed using a diesel generator, a generator controller, a governor, and an AVR. A system configuration method for a generator, power quality test, and the power characteristics of a variable speed generator were analyzed. The voltage (250 - 440 VAC) and frequency (34 - 60 Hz) of the variable speed generator were set to 60 - 100 % of the rated value, and the engine was set to operate from 1100 - 1800 rpm. It was confirmed that the voltage, current, and frequency of the generator output fluctuated in a stable manner according to the power amount when changing the engine speed of the generator according to the load variation.

Research Issues and Major Design Considerations on Video See-through HMDs (비디오 씨쓰루 HMD 연구 동향과 주요 설계 고려 요소)

  • Lee, Joong Ho
    • The Journal of the Convergence on Culture Technology
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    • v.5 no.2
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    • pp.345-353
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    • 2019
  • The Video See-through HMD(VSHMD) captures real-world view through a camera set mounted in front of the HMD. The VSHMD outputs this visual information in real time through the display in the HMD, which technique can be used as mixed reality, augmented reality, and virtual reality device. Recently, there is growing interest in VSHMD due to the rapid development of camera and display technology. However, VSHMD is still not free from many technical huddles and human factor issues. This paper summarizes the VSHMD related researches so far, presents the major issues to be solved in advance, and suggests design considerations that should be beneficial to VSHMD development, focused on the human factors, that presents solutions to effectively overcome the limitations of VSHMD functionalities in current.

Image Restoration Algorithm based on Segmented Mask and Standard Deviation in Impulse Noise Environment (임펄스 잡음 환경에서 분할 마스크와 표준편차에 기반한 영상 복원 알고리즘)

  • Cheon, Bong-Won;Kim, Woo-Young;Sagong, Byung-Il;Kim, Nam-Ho
    • Journal of the Korea Institute of Information and Communication Engineering
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    • v.25 no.8
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    • pp.1039-1045
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    • 2021
  • In modern society, due to the influence of the 4th industrial revolution, camera sensors and image-based automation systems are being used in various fields, and interest in image and signal processing is increasing. In this paper, we propose a digital filter algorithm for image reconstruction in an impulse noise environment. The proposed algorithm divides the image into eight masks in vertical, horizontal, and diagonal directions based on the local mask set in the image, and compares the standard deviation of each segmentation mask to obtain a reference value. The final output is calculated by applying the weight according to the spatial distance and the weight using the reference value to the local mask. To evaluate the performance of the proposed algorithm, it was simulated with the existing algorithm, and the performance was compared using enlarged images and PSNR.

A Study on the Output Power of Shingled Mini Module Depending on Reflectance of Backsheets (Backsheet 반사율에 따른 Shingled Mini Module 출력변화에 대한 연구)

  • Cho, Seong Hyeon;Moon, Ji Yeon;Son, Hyoung Jin;Jun, Da Yeong;Kim, Sung Hyun
    • Current Photovoltaic Research
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    • v.8 no.4
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    • pp.129-133
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    • 2020
  • It is very important to optimize the reflectance of incident light in solar modules for improving output power and reducing loss of cell-to-module (CTM). It is assumed that a higher reflectance backsheet may improve optical efficiency. However how much output power is related to optical properties by reflectance property of backsheets have not been revealed clearly yet. A total of 3 types of industrial backsheets with 3 type of industrial encapsulants (EVA or POE) were analyzed as fabricated mini modules used shingled cells. According to the type of backsheets, the difference between the highest and lowest average reflectance in the range of 400 nm to 1200 nm was found to be 13.08% by UV-visible spectroscopy. Also, when using the same encapsulant, the maximum gap value of the output power increase was measured by about 3.755 mW% (166.02 mW). The correlation between reflectance and output power was experimentally found by measuring the output property of the fabricated shingled mini modules.