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가스터빈 연소실 냉각을 위한 충돌제트/유출냉각기법에서 요철설치에 따른 냉각특성
이동호(Dong Ho Rhee),남용우(Yong Woo Nam),조형희(Hyung Hee Cho) 대한기계학회 2003 대한기계학회 춘추학술대회 Vol.2003 No.11
The present study is conducted to investigate the effect of rib arrangements on an impingement/effusion cooling system with crossflow. To simulate the impingement/effusion cooling system, two perforated plates are placed in parallel and staggered arrangements with a gap distance of 2 times of the hole diameter. Initial crossflow passes between the injection and effusion plates, and square ribs (3㎜) are installed on the effusion plate. Both the injection and effusion hole diameters are 10 ㎜, and the flow rate of crossflov is fixed to that of the impinging jet. The Reynolds number based on the hole diameter and hole-to-hole pitch are fixed to 10,000 and 6 times of the hole diameter, respectively. To investigate the effects of rib arrangements, various rib arrangements, such as 90°transverse and 45°angled rib arrangements, are used. Three 90°rib arrangements and two 45°rib arrangements, which are accomplished by changing the position and the pitch of rib or the attack angle relative to the effusion hole. With the initial crossflow, the flow and heat/mass transfer characteristics are changed significantly from the results without the crossflow. The locally low transfer regions are formed because the wall jets are swept away. When the ribs are installed on the effusion plate, the locally low transfer regions are reduced or disappear, and uniform heat transfer coefficient distributions are obtained because the ribs prevent the wall jets from being swept away by the crossflow and increase local turbulence of the flow near the surface. Average heat transfer coefficients with rib turbulators are approximately 10% higher than that without ribs, and the higher values are obtained with small pitch of ribs.
개방형 웹 애플리케이션 스토어 연동을 위한 프로토콜의 설계 및 구현
백지훈 ( Ji Hun Baek ),김지훈 ( Ji Hun Kim ),남용우 ( Yong Woo Nam ),이형욱 ( Hyung Uk Lee ),박상원 ( Sang Won Park ),전종홍 ( Jong Hong Jeon ),이승윤 ( Seung Yoon Lee ) 한국정보처리학회 2013 정보처리학회논문지. 소프트웨어 및 데이터 공학 Vol.2 No.10
최근 휴대용 기기들이 대중화되어 한 사람이 하나 이상의 휴대용 기기를 소지하고 있고 스마트폰 활용도 또한 늘어나는 추세이다. 스마트폰이 많이 보급됨에 따라 폭발적으로 스마트폰의 애플리케이션 활용이 늘어나고 있다. 현재의 애플리케이션 스토어는 플랫폼별로 애플리케이션을 개발해줘야 하는 종속적인 면이 있다. 앱스토어는 크게 애플의 앱스토어와 구글의 안드로이드 마켓으로 양분되어 있고 각 플랫폼에 맞춰 애플리케이션이 개발되어야 한다. 각각의 플랫폼에 맞춰서 애플리케이션을 개발하면 개발 비용은 2배에 근접하고 다른 소규모 플랫폼(Ex 바다)들은 애플리케이션 개발자들을 모아야만 자신들의 플랫폼에 맞는 애플리케이션이 나오는 단점이 있다. 이러한 플랫폼에 맞춰서 개발된 네이티브 애플리케이션의 범용성에 대한 해결책과 모바일에서의 다양한 요구사항을 수용하기 위해 웹 애플리케이션이 각광받고 있다. 웹 애플리케이션은 플랫폼에 종속되지 않고 어느 휴대용 기기에서도 동작하기 때문에 각 플랫폼별로 개발하지 않아도 된다는 장점이 있다. 따라서 웹 애플리케이션 스토어끼리의 연동 프로토콜을 통해 애플리케이션을 연동하여 어느 웹 애플리케이션 스토어에서도 볼 수 있고 특정 플랫폼에 구애 받지 않는 거대한 시장이 생겨날 수 있다. 하지만 아직 웹 애플리케이션 스토어라는 표준이 없고 존재하는 웹 애플리케이션 스토어가 없다. 이를 위해 본 논문에서는 연동에 관한 프로토콜을 제안하고 구현을 통해 기존의 애플리케이션 스토어의 단점을 보완할 수 있는 방법을 제시한다. Recently, because the portable devices became popular, it is easily to see that each person carries more than just one portable device and the use of the smartphone stretches as time goes by. After the smartphone has propagated rapidly, the total usage of the smartphone applications has also increased. But still, each application store has a different platform to develop and to apply an application. The application store is divided into two big markets, the Android and the Apple. So the developers have to develop their application by using these two different platforms. Developing into two different platforms almost makes a double development cost. And for the other platforms, the weakness is, which still have a small market breadth like Bada is not about the cost, but about drawing the proper developers for the given platform application development. The web application is rising up as the solution to solve these problems, reducing the cost and time in developing applications for every platform. For web applications don`t need to make a vassal relationship with application markets platform. Which makes it possible for an application to operate properly in every portable devices and reduces the time and cost in developing. Therefore, all of the application markets could be united into one big market through a protocol which will connect each web applications market. But, still there is no standard for the web application store and no current web application store is possible to interlock with other web application stores. In this paper, we are trying to suggest a protocol by developing a prototype and prove that this protocol can supplement the current weakness.