• Journal of IKEEE
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• v.17 no.4
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• pp.492-498
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• 2013

Recently, as Smartphone users increase, a variety of Smartphone games have been released. However, many games are just for individuals, it is not easy to find games in which people can do together. In this paper, we propose the multiple access game control system using bluetooth, which can support multiple users to do games together. The proposed system overcomes the limitation of current PC games, and also proposes a convenient way in which people can enjoy the game easily without expensive equipments such as Nintendo Wii.

• Journal of Korea Ship Safrty Technology Authority
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• s.37
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• pp.24-34
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• 2014

최근 몇 년간 국내 해양레저에 대한 관심 증가에 따라, 정부와 지자체의 해양레저산업에 대한 연구 지원 및 마리나 구축 사업 수행 등 해양레저 수요를 수용할 수 있도록 장비 및 시설 확보를 위하여 다양한 방면으로 노력이 한창이다. 그러나 아직까지 국내의 해양레저를 위한 시설 구축은 진행단계이다. 전국적으로 마리나 구축을 위한 작업이 한창이며, 이미 구축된 마리나에서 요트를 계류할 경우 관리하는데 드는 비용이 만만치 않아 사용자에겐 부담이 크다. 세일링 요트의 경우 span이 큰 모노킬이 부착되어있으므로 마리나 혹은 육상계류시설을 이용하지 않을시 모노킬이 파손될 위험이 있다. 본 연구에서는 서해안의 해양레저 대중화를 위해 누구나 안전하게 세일링을 즐길 수 있고, 두 개의 킬로 선체를 지지하여 육상 및 갯벌에서도 선체가 기울지 않고 설 수 있는 트윈킬 요트를 개발하여 보급하고자 한다. 기존 세일링 요트중 성능이 좋은 편인 야마하에서 제작한 블루워터21의 선형을 활용하였고 트윈킬은 블루워터21 모노킬의 면적 및 무게중심 등을 분석하여 개발하였다. 트윈킬 요트의 경우 모노킬 요트보다는 저항성능이 불리할 것으로 예상되므로 모형시험을 수행하였으며, 그 결과 모노킬과 트윈킬의 저항성능에 대한 차이가 예상보다 크지 않음을 확인하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.10a
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• pp.123-124
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• 2016

본 연구는 스마트폰 사용자가 응급상황에 처했을 때 사용자의 정확한 위치 정보를 응급 구조 센터에 전달할 수 있는 방법을 개발함에 목적을 둔다. 사고의 경우 실외 뿐만 아니라 실내에서 많은 사고가 발생하는데, 일반적으로 위치 정보를 획득에 사용되는 GPS 의 경우는 실내 위치를 정확하게 파악하기 어렵기 때문에 구조를 지연시키는 문제를 야기한다. 본 연구는 이러한 상황들을 방지하기 위해 GPS와 와이파이, 블루투스를 각각 이용한 삼각 측량법을 통해 실내의 위치정보를 측정하고 더 나아가 압력센서를 통해 사용자의 위치를 3차원적으로도 탐색한다. 실험 결과, GPS를 이용하는 것보다 블루투스를 이용하는 것이 더 정확한 실내 정보를 탐색하는 것을 알 수 있었다. 또한 압력계를 통해 고도를 측정함으로써 건물 내부에서 사용자의 수직적 위치를 측정할 수 있었다. 이러한 결과는 위도 경도의 정확한 정보와 함께 고도에 대한 예측을 가능하게 함으로써 보다 정확한 실내 위치 정보를 획득하여 골든 타임을 확보하는데 도움이 될 것으로 보인다.

• Journal of Life Science
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• v.21 no.4
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• pp.610-612
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• 2011

We developed a spectrophotometric assay for the quantitative determination of chlorogenic acid based on the formation of green pigment at $50^{\circ}C$ under glycine and alkaline conditions in 96-well plates. The formation of green pigment was linear with a series of chlorogenic acid concentration (0-$300\;{\mu}M$). Using this method, the content of chlorogenic acid (12.42 mg/g dry weight) in the leaves of blueberry was quantified. This method is high-throughput, cost-effective, rapid, and easy to perform.

• Korean journal of food and cookery science
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• v.31 no.6
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• pp.718-724
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• 2015

In this study, we investigated the quality and antioxidant activity of blueberry-pyun (traditional Korean jelly using blueberry) according to different ratios of blueberry juice (100%, 80%, 60%, 40%, and 20%). Moisture and pH significantly decreased as the content of blueberry juice increased (p<0.05). As the amount of blueberry juice decreased, the lightness (L) decreased. At the same time, the redness (a) and yellowness (b) were significantly higher (p<0.05). DPPH radical scavenging activity and anthocyanin contents increased significantly when the amount of blueberry juice increased (p<0.05). In the texture profile analysis, hardness decreased as the content of blueberry juice increased. There were no significant differences in springiness. 20% blueberry juice showed the highest gumminess and chewiness. During sensory evaluation, 60% blueberry juice showed the highest in the appearance, color, sweetness and overall-acceptability. From these results, we conclude that blueberry-pyun made of 60% blueberry juice is the most desirable.

• Transactions of the Society of Information Storage Systems
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• v.2 no.3
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• pp.178-183
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• 2006

A Blu-ray disc, which has a more than 25GB optical capacity, has been known as a promising next-generation optical disc format. It commonly has a 1.1 mm thick substrate and a 0.1 mm thick cover layer for beam transmitting and the protection of the reflecting surface. The cover layer is generally formed by the spin coating process. However, in conventional spin coating, small bumps are formed along the rim of the disc, which results in the fatal reading error. Numerical simulation of the thin film flow behaviors during spin coating with the commercial solver and optimal spinning conditions was obtained. Thickness distribution of the cover layer according to the variation of substrate's edge shape could be calculated as well. By modifying the shape of the substrate edge shape, the bumps along the disc rim could be minimized, and it was proved that the chamfered edge, around $5{\sim}10$ degree, is the simplest and most effective way to minimize the bumps.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.42 no.9 s.339
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• pp.57-64
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• 2005

A Piconet consists of Master device and several Slave devices. Master and Slave devices are transmitted using TDD (Time Duplex Oivision) in a Piconet. A Scattemet constructed by several Piconets communicates by a Piconet. Bluetooth Specification defines the meaning of a Scatternet. But the formation and scheduling method is not defined. For the efficient formation of a Scatternet, the preceding research proposes a tree-shape topology Scatternet. But this research passes over the characteristic of Bluetooth transmission carried out by a Piconet in the Scattemet. So this Paper proposes a efficient throughput tree formation Scatternet algorithm To improve the throughput of a Scatternet, this paper proposes a tree tolopology that guarantees the efficient throughput of a Piconet

• Journal of the Korean Chemical Society
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• v.54 no.5
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• pp.603-610
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• 2010

The potential feasibility of Maghnia clay as adsorbent to remove three cationic dyes (methylene blue (MB), neutral red (NR) and malachite green oxalates (MG)) from aqueous solution was investigated at various operating parameters such as contact time, pH, initial dye concentration and adsorbent dose. Optimum pH values for dyes adsorption were 6 for NR and 7 for MB and MG, respectively. Maximum adsorption of dyes, i.e. $\geq$ 90% has been achieved in aqueous solutions in 60 minutes. The adsorption of dyes followed the pseudo-second-order rate equation.

• Journal of the Korean Society of Marine Environment & Safety
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• v.20 no.4
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• pp.426-434
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• 2014

The research developed twin keel yacht for everyone which is able to stand erectly on mud flat without list and intended to commercialize the development product for popularization of west coast's marine leisure industry. Yacht's linear was utilized by "Blue Water21" has superior performance among the existing sailing yachts and twin keel model has been tested by calculation of mono keel's extent and its center of gravity. The result was that only 4 % of difference have been identified between mono keel and twin keel's hydrodynamic resistance which was smaller difference than predicted.

• Journal of the Korean Crystal Growth and Crystal Technology
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• v.25 no.5
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• pp.188-192
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• 2015

Gemological and spectroscopic properties of HPHT synthetic diamonds from New Diamond Technology (NDT) company in St. Petersburg (Russia) were examined. Their color (colorless, near-colorless with some boron and Fancy blue with high boron content) and clarity ($VVS-SI_1$) grades were comparable to those of top natural diamonds. NDT synthetic diamonds fluoresced and phosphoresced blue or orange under SWUV light. Photoluminescence spectra revealed H3 center with very small intensity and NV centers. The intensity of H3 in NDT synthetic diamond has very weak in comparison with natural one. Using a combination of gemological and spectroscopic tests, gem-quality synthetic diamonds from NDT can be distinguished from natural diamonds of similar quality.