• 한국인쇄학회지
• /
• 제28권1호
• /
• pp.43-50
• /
• 2010

The 200mesh screen was tensioned and fixed on a frame. When applied tension to 5N and 10N per unit area, a side length of opening of the screen was 163.223${\mu}m$ and 168.224${\mu}m$, respective. But side length not tensioned was 158.879${\mu}m$. We knew that a side length of opening of the screen rarely changes with tension applied to the screen. The appearances that a side length of opening of the screen expand little are due to a decreasing diameter of thread by means of tension. In a thickness measurement of screen, While the high density mesh screen that had a lot of knots that crossed a line of latitude and longitude per unit area appeared a higher numerical value, the low density mesh screen that had a few knots appeared a low numerical value.

• 스마트미디어저널
• /
• 제1권4호
• /
• pp.79-83
• /
• 2012

소프트웨어 개발 시 프로젝트 크기를 늘리는 것(scaling up)은 간단한 프로젝트를 가져다가 각 부분을 좀 더 크게 만드는 단순한 문제가 아니다. 프로젝트의 크기가 증가 할 때 의사소통도 유지되어야 하고, 비용, 생산성, 품질, 개발활동, 개발방법론 등도 고려되어야 한다. 본 논문에서는 소프트웨어 프로젝트의 크기로 인해 개발 될 소프트웨어 프로젝트가 실패하지 않도록 하기 위한 중요 요소들의 효율적인 사용방법들에 대해서 논의한다.

• 생물환경조절학회지
• /
• 제18권2호
• /
• pp.137-141
• /
• 2009

분주 크기와 배지 종류가 고추냉이 생존율과 생육에 미치는 영향을 알아보고자 환경이 조절된 생장상에서 60일간 재배하였다. 수태로 감싼 근경 크기(직경) 5mm 이상 분주 묘의 생존율은 100%였으며, 생육(초장 12cm 내외, 엽수 $3{\sim}4$장)은 양호하였다. 생육 60일의 분주 묘는 초장 20cm 이상, 엽수가 $1{\sim}2$장 증가하였다. 루톤 분의제 처리는 생존율과 생육에 효과가 없었다. 배지 종류(마사, 난석)에 따른 직경 $5{\sim}10$mm 크기의 분주 묘를 담액 수경으로 재배하였을 때 83% 이상의 생존율을 보였으며 배지 종류에 따른 생육 차이는 없었다. 따라서 근경 크기 5mm 이상의 고추냉이 분주를 환경이 조절된 생장상에서 30일간 수경재배 방식으로 순화하여 고추냉이 건전 묘를 생산할 수 있다.

• ETRI Journal
• /
• 제39권4호
• /
• pp.535-545
• /
• 2017

This paper presents a novel K-band (18 GHz) 16-quadrature amplitude modulation (16-QAM) orthogonal frequency-division multiplexing (OFDM)-based $2{\times}2$ line-of-sight multi-input multi-output communication system. The system can deliver 356 Mbps on a 56 MHz channel. Alignment mismatches, such as amplitude and/or phase mismatches, between the transmitter and receiver antennas were examined through hardware experiments. Hardware experimental results revealed that amplitude mismatch is related to antenna size, antenna beam width, and link distance. The proposed system employs an alignment mismatch compensation method. The open-loop architecture of the proposed compensation method is simple and enables facile construction of communication systems. In a digital modem, 16-QAM OFDM with a 512-point fast Fourier transform and (255, 239) Reed-Solomon forward error correction codecs is used. Experimental results show that a bit error rate of $10^{-5}$ is achieved at a signal-to-noise ratio of approximately 18.0 dB.

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 1998년도 춘계연구발표회 논문개요집
• /
• pp.26-27
• /
• 1998

• 한국자기학회:학술대회 개요집
• /
• 한국자기학회 2005년도 하계학술연구발표회 논문개요집
• /
• pp.116-117
• /
• 2005

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 I
• /
• pp.477-480
• /
• 2003

Packet losses in the Internet can dramatically degrade quality of multimedia streams. Forward Error Correction (FEC) is one of the best methods that can protect data from packet erasures by means of sending additional redundant information. Proposed control algorithm provides the possibility of receiving real-time multimedia streams of given quality wifth minimal traffic overhead. The traffic optimization is reached by adjusting packet size as well as block code parameters. Calculations and simulation results show that for non-bursty network conditions traffic optimization can lead to more than 50% bandwidth reduction.

• 한국정보디스플레이학회:학술대회논문집
• /
• 한국정보디스플레이학회 2005년도 International Meeting on Information Displayvol.I
• /
• pp.41-45
• /
• 2005

A new algorithm of the image mapping which is a technique of the elemental image generation is proposed. The proposed method is based on the characteristics of the lens array such as the number, the size and the focal length of the elemental lens. The 3D image generated by 3D graphic API such as OpenGL can be directly adopted without the complex adaptation. Since the image mapping using the proposed method can enhance the speed of the elemental image generation, the computer- generated integral imaging system can be applied to virtual reality system.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2006년도 하계종합학술대회
• /
• pp.1011-1012
• /
• 2006

In this paper, implementation process of standard platform for T-DMB Receiver in low-cost and small-size are following: First, implement SoC for 32 bit RISC CPU and 16 bit DSP, Hardware H.264 CODEC, Post Processor or Video Display, Audio Processor, I/O Device. Second, implement Real Time OS for flexible application. Third, propose simple architecture for interface with peripheral devices using one-chip processor.

• 한국세라믹학회지
• /
• 제44권12호
• /
• pp.747-750
• /
• 2007

The thermal conductivities of nano-sized fumed silica-based insulation media were investigated by varying a mean particle size of the silicon carbide opacifiers and ceramic fiber content. Opacifying effect of ceramic fiber and silicon carbide powders was discussed in terms of their content and the mean particle size of them. As the fiber contents increased from 10 wt% to 30 wt% in a material, its thermal conductivity at temperatures of about $620^{\circ}C$ decreased from 0.171 $Wm^{-1}K^{-1}$ to 0.121 $Wm^{-1}K^{-1}$. Meanwhile, the thermal conductivity at temperatures of about $625^{\circ}C$ decreased from 0.128 $Wm^{-1}K^{-1}$ to 0.092 $Wm^{-l}K^{-1}$ as the mean SiC particle size decreased from $31{\mu}m$ to $10{\mu}m$.