• Proceedings of the Korea Contents Association Conference
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• 2008.05a
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• pp.270-273
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• 2008

The point of the meaning, this study selects population which is aged over 65 and new silver generation who is aged between 55 to 64. The objects were selected by purposeful sampling method and the 933 objects who participated in leisure sports age over 55 were used for this thesis's analysis. The results of the study were as follow; First, the weekly participation frequency was physical psychological burden, facilities, information technology, interpersonal relations, concern lack, time lack, bear. there was statistically significant difference. Second, the daily workout time was physical psychological burden, facilities, information technology, interpersonal relations, concern lack, time lack, bear. there was statistically significant difference. Third, the participant experience was physical psychological burden, facilities, information technology, interpersonal relations, concern lack, time lack, bear. there was statistically significant difference.

• Proceedings of the KIPE Conference
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• 2018.07a
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• pp.6-8
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• 2018

긴 수명과 높은 효율로 차세대 조명기구로 사용되는 LED를 구동하기 위하여, 일반적으로 역률 보정을 위한 PFC 단과 출력 조절을 위한 DC/DC 단이 직렬로 연결된 구조를 사용하게 된다. 이때 PFC 과정에서 DC 링크 전압이 120Hz 전압 맥동을 갖게 되는데, 이는 DC/DC 단에도 영향을 주며 최종 출력전류 역시 120Hz 저주파 맥동을 갖게 된다. 본 논문은 LED 조명용 LLC 공진 컨버터의 120Hz 저주파 맥동 전류 리플을 저감 방법에 관한 연구이다. 기존 제어기에 전류 리플을 보상하여 제어하는 방법에 대하여 설명하고 시뮬레이션을 통해 이를 확인한다.

• Journal of the Korea Society for Simulation
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• v.20 no.4
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• pp.91-96
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• 2011

As the user's demand for ultra high-speed wireless internet has increased, the standardization, research and development of future mobile communication systems have been done for several years. IMT-Advanced system which is called fourth generation mobile communication should support the data rate of 1 Gbps for nomadic users and 100 Mbps for mobile users. Also, the system should hold call connection at the mobile speed of 350 km/h. Meanwhile, since Doppler spread is linearly proportional to mobile speed, high mobility leads to the increase of interference between subcarriers and the deterioration of detection performance consequently. In this paper, we evaluate and analyze detection probability with respect to equalization methods in time-varying channels under system parameters complying with IMT-Advanced requirements. According to computer simulation conducted by varying mobile speed and code rate, MMSE based equalization can mitigate performance degradation of IMT-Advanced system considerably in time-varying channels.

• The Journal of the Korea institute of electronic communication sciences
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• v.19 no.2
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• pp.417-426
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• 2024

In general, the implementation of machine learning requires prior knowledge and experience with deep learning models, and substantial computational resources and time are necessary for data processing. As a result, machine learning encounters several limitations when deployed on embedded processors. To address these challenges, this paper introduces a novel approach where a genetic algorithm is applied to the convolution operation within the machine learning process, specifically for performing a selective convolution operation.In the selective convolution operation, the convolution is executed exclusively on pixels identified by a genetic algorithm. This method selects and computes pixels based on a ratio determined by the genetic algorithm, effectively reducing the computational workload by the specified ratio. The paper thoroughly explores the integration of genetic algorithms into machine learning computations, monitoring the fitness of each generation to ascertain if it reaches the target value. This approach is then compared with the computational requirements of existing methods.The learning process involves iteratively training generations to ensure that the fitness adequately converges.

• The Journal of Korean Institute of Next Generation Computing
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• v.15 no.5
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• pp.31-42
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• 2019

With the recent development of deep learning technology, remarkable achievements have been made in many research areas of computer vision. Deep learning has also made dramatic improvement in two-dimensional or three-dimensional human pose estimation based on a single image, and many researchers have been expanding the scope of this problem. The human pose estimation is one of the most important research fields because there are various applications, especially it is a key factor in understanding the behavior, state, and intention of people in image or video analysis. Based on this background, this paper surveys research trends in estimating human poses based on a single image. Because there are various research results for robust and accurate human pose estimation, this paper introduces them in two separated subsections: 2D human pose estimation and 3D human pose estimation. Moreover, this paper summarizes famous data sets used in this field and introduces various studies which utilize human poses to solve their own problem.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.41 no.11
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• pp.1364-1373
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• 2016

Ultra High Definition Television (UHDTV) has attracted much attention as one of next generation broadcasting services. For the commercialization of UHD broadcasting service, standardization groups including the DVB (Digital Video Broadcasting) and the ATSC (Advanced Television Systems Committee) have decided to adopt the Orthogonal Frequency Division Multiplexing (OFDM) for signal transmission. However, when the carrier frequency is not properly synchronized at the receiver, inter-symbol interference (ISI) and inter-carrier interference (ICI) may occur. In order to avoid performance degradation resulting from ISI or ICI, receivers should synchronize the carrier frequency by using preambles and pilot symbols. However, there only few published literature dealing with the frequency offset estimation methods regarding the next generation terrestrial broadcasting. In this respect, this paper proposes a method to estimate timing and fractional frequency offset for the ATSC 3.0 system by using a preamble bootstrap symbol. The proposed detector can detect the fractional frequency offset by adding a complex conjugate product on the conventional estimator where only timing offset can be estimated.

• Proceedings of the Korea Information Processing Society Conference
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• 2012.11a
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• pp.288-289
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• 2012

최근 데이터 저장을 위한 고속 입출력에서 병목현상을 해결하기 위해 다양한 SSD(Solid State Drive) 관련 연구가 많이 수행되고 있다. 대표적인 것으로 비휘발성 메모리인 플래시와 차세대 반도체 메모리인 SCM(Storage Class Memory) SSD가 있고, 휘발성 메모리인 DRAM기반의 SSD가 있다. 플래시 또는 SCM 메모리기반 저장장치는 하드 디스크기반 저장장치에 비해 읽기 속도가 빠르며, 내구성이 강하다는 장점으로 새로운 저장장치 시스템의 저장매체로 부각되고 있으나, 단위 저장 공간 당 높은 가격으로 인해 저장장치 시스템에 적용하기 에는 많은 문제점이 있다. 최근에는 이러한 문제를 해결하기 위해 고용량의 하드디스크와 SSD를 RAID 또는 단일 저장장치 매체로 구성하는 하이브리드 저장장치에 관한 연구와 제품이 출시되고 있다. 본 논문에서는 이러한 하이브리드 저장 매체 어레이를 저장장치 시스템으로 구성하기 위한 볼륨구성과 해당 서버에 볼륨 제공 서비스를 수행하기 위한 하이브리드 저장장치 시스템 설계 방법에 대해 설명한다.

• The Journal of the Korea Contents Association
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• v.7 no.10
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• pp.10-18
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• 2007

Today, third-generation(3G) of mobile communication service executing the video and TV. And low cost, high speed data rate will emerge communication of the fourth generation(4G) in future. So, in this paper we studied occupied frequency bandwidth of common technique criteria among the technique criteria for the 4G mobile communication of FDD-based on Up/Down-link. The mobile communication traffic is predicted Up/Down-link of non-symmetric in future. So we proposed the PHY layer parameters of occupied frequency bandwidth of Up/Down-link with both 1:3 and 1:6. We also verified this through the simulation. We proposed the occupied frequency bandwidth for the 4G mobile communication in this paper.

• Magazine of the Korean Society of Hazard Mitigation
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• v.7 no.1 s.24
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• pp.19-35
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• 2007

본고는 건설교통부의 지역특성화사업의 일환으로 진행 중인 "차세대 해안공간확보기술"에 관하여 일반 적인 사항을 설명하고자 한다. 본 과제 "차세대 해안 공간확보기술"는 2005년 06월 30일부터 2010년 07년 29일 까지 진행 예정이다. 과제의 연구를 위하여 주관기관 1개, 협동연구기관 4개, 참여기업 25개로 구성되어 있으며 총 연구비는 약 95억원이다. 2007년 3월 현재 2차년도 연구를 진행 중이다. 본 과제는 해안공간확보를 위하여 방(防) 용(用) 보(保)를 목표로 하고자 한다. 즉, 해안을 방어, 이용, 보전을 대상으로 각각의 세부과제를 분할하였다. 세부과제는 방어에 해당하는 제1세부과제인 해안저지대 방호기술, 이용에 해당하는 제2세부과제 해안매립공간 확보기술과 제3세부과제 해안 레저공간 확보 기술, 보전에 해당하는 제4세부과제 해안유지 및 확보기술로 구성되어 있다. 본 과제는 기술적 목표 외에 기반구축, 기업지원, 정책지원, 지역기여, 연계활동(홍보활동, 국제협력, 창업지원) 등의 의무적 활동을 요구하고 있다. 따라서 본 연구단은 언론을 통한 홍보, 지방정부에 대한 정책자문, 참여자 및 기술자를 대상으로 워크샵, 심포지움을 통한 교육 및 홍보, 일본 공항항만연구소와 방문 세미나개최, 요코하마국립대학 시바야마 연구실과 국제협력을 위한 양해각서 체결, 지역을 중심으로 한 "해안공간학회"설립 등을 목표로 하고 있다.

• The KIPS Transactions:PartA
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• v.14A no.7
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• pp.391-398
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• 2007

In this paper, we design a future mobile camera standard interface based on the MIPI CSI-2 and D-PHY specification. The proposed CSI-2 have the efficient multi-lane management layer, which the independent buffer on the each lane are merged into single buffer. This scheme can flexibly manage data on multi lanes though the number of supported lanes are mismatched in a camera processor transmitter and a host processor. The proposed CSI-2 & D-PHY are verified under test bench. We make an experiment on CSI-2 & D-PHY with FPGA type test-bed and implement them onto a mobile handset. The proposed CSI-2 & D-PHY module are used as both the bridge type and the future camera processor IP for SoC.