• Journal of Korean Electronics
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• v.24 no.9
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• pp.10-10
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• 2004

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.12 no.1
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• pp.1-8
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• 2013

This study investigates life and damage due to structural and fatigue load at speaker placer with wall hanger type. As the small stress and deformation are shown at the models of A, B and C shapes on structural analysis, there is no problem at installing speaker placer. As the largest stress is happened at the middle part of joint on the models of A, B and C shapes, this part must be considered at the design. A shape is thought to have most fatigue damage among 3 shape models. C shape model has most excellent, but A model has least at fatigue durability. This study result is applied with the design of speaker placer and it can be useful at predicting prevention and durability against its damage.

• Proceedings of the Korea Information Processing Society Conference
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• 2011.11a
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• pp.80-82
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• 2011

트위터는 빠르고 쉽게 많은 사람들에게 다양한 정보를 전달해 줄 수 있는 특징을 가지고 있다. 이에 많은 기업과 기관들이 트위터를 이용해 홍보나 마케팅에 접목시키고 있으며 각종 소식과 공지 사항 등을 고객이나 소속된 사람들에게 빠르게 전달하고 있다. 본 논문에서는 트위터를 이용하여 기존의 벽걸이형 게시판을 대체하는 방법에 대하여 설명한다.

• 한국정보통신설비학회:학술대회논문집
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• 2002.08a
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• pp.145-147
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• 2002

다양한 정보와 동영상을 표시할 수 있는 멀티미디어 시대의 디스플레이 소자로서 Plasma Display Panel(PDP)은 특히 대형화면 분야에 유력한 표시장치로 각광을 받고 있다. 그러나 대화면의 벽걸이형 표시장치인 PDP가 널리 보급되기 위해서는 몇 가지 해결되어야 할 문제점들이 있다. 높은 소비전력과 화질의 향상, 그리고 높은 생산 가격 등의 문제점 중에서도 PDP 의 소비 전력을 낮추어야 하는 문제는 PDP의 보급을 위하여 가장 중요한 문제로 지적되고 있다. 새로운 유지 방전 구동 방식인 전하 제어 구동 방식은 기존의 구동 회로에 비해서 낮은 외부 공급전압을 사용함으로 사용되는 소자의 저가격화가 가능하며, 방전 시 소비되는 방전전류를 감소 시켜 소비전력을 낮추며 결과적으로 소비전력 대비 발광효율을 증대시키는 새로운 고효율 AC PDP 구동 방식이다.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.381-384
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• 2006

PDP is watched as a wall-mounted flat displayer for merits, such as ability to visual maximize and natural color reproduction. But it is more necessary to research video quality why PDP is competing with another displayer. This paper is explaned HDL software architecture implementaion for PDP test-bed module and producing board using FPGA to research 42" PDP video quality.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2014.10a
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• pp.245-246
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• 2014

에어컨의 실내기에서 발생하는 소음은 주로 회전하는 팬의 진동에 의하여 발생하게 된다. 이는 구조기인 소음으로 낮은 주파수특성을 갖고, 흡음이나 차음의 소음저감방법으로는 해결하기 어려운 특성을 가지고 있다. 본 연구에서는 벽걸이형 에어컨 원심팬에 발생하는 진동(sway motion)의 원인을 진동실험과 동역학 시뮬레이션을 통하여 규명하였다. 실험적인 측면으로는 시스템분석과 시그널분석을 통하여 원심팬 구성품의 물성치 및 동특성을 확보하였고, 해석적인측면으로는 실험으로 확보된 원심팬의 동특성을 바탕으로 동역학 시뮬레이션 모델을 수립하였다. 실험 및 동역학 시뮬레이션을 바탕으로 원심팬 진동의 원인을 규명하였고, 원심팬 진동의 원인은 원심팬과 모터축사이의 축정렬 불량임을 확인하였다. 이를 해결하고 진동을 저감하기위한 장치를 고안하고 실험을 통하여 진동저감효과를 확인하였다.

• Journal of Korean Ophthalmic Optics Society
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• v.10 no.2
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• pp.111-118
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• 2005

The optotypes widely used as a necessity in the course of optometry are the world authorized versions which contain items such as the Landolt's rings, Snellen's chart and also Arabian numbers, Korean letters, Pictures and so on. In Korea, the Hahn-chun-suk test chart has been In use generally alolng with Chung-san test chart and Jin-yong-han test chart also in use on the wall. But these sort of test charts hung on the wall have some problems such as the difference in test results owing to the rate of illumination and so a more accurate method is required. To solve the problem of inaccuracy in optometry, the projected type of charts with digital instrument such as the beam projector has been developed lately. This chart projector with consistent high resolution and the ability to provide various charts can help eye examiner perform effective examination and thus is looked positively upon as the automated total optometry system. So in this study our purpose is to examine the accuracy of the projected chart. It was done by comparing it with the frequently used test chart. The results of experiment are as follow. When the projected chart was used, cases that subject read charts one step higher were 10%, two step higher 2% than perfectly corrected vision. When Han-chun-suk test chart was used, cases that subject read charts one step higher were 12%, and two step higher were 4%.

• The Transactions of the Korean Institute of Power Electronics
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• v.7 no.2
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• pp.121-128
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• 2002

A new high-efficient energy-recovery circuit is proposed to drive a plasma display panel (PDP) and compared with the conventional circuit. The proposed circuit uses only two inductors and no auxiliary circuit to recover the energy stored in the equivalent intrinsic capacitance of PDP. Therefore it features a simpler structure, less mass, lower cost of production, higher efficiency, and fewer power devices. The very stable and uniform light emitted from PDP proves the high quality of screen. It is suitable for wall-hanging color TVs. The proposed circuit, operating at 200kHz, is verified to be applicable on a 42-inch PDP by experimental results.

• The Journal of the Convergence on Culture Technology
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• v.6 no.4
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• pp.429-434
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• 2020

Worldwide Electric Vehicle (EV) sales are rapidly increasing. But in many cases, charging locations can be found within or near downtown area of the city which makes EV users living outskirts of the city very difficult to establish their daily EV charging routines. In order to improve this situation, we have come up with a daily EV charge service connected with convenience stores and restaurants within reach of most EV users living in South Korea. We aim to allow users to charge their EVs while they shop and eat, just as if they charge their smartphones at cafes and restaurants. We have gone through user diary research and focus group interview research to figure out current user's concerns regarding charging and maintenance of EVs and applied the findings to our proposed service design.