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블루투스 통신을 이용한 안드로이드 교통신호 제어 앱 구현
권상홍(Sang-Hong Kwon) 산업기술교육훈련학회 2011 산업기술연구논문지 (JITR) Vol.16 No.4
In this paper, we implement the application on a smart device which controls traffic signals by applying the writing method of Android appplications that use bluetooth communication. A traffic signalling device equipped with PLC that supports RS232C communications connects a bluetooth serial adapter in hardware. The app controls traffic signals wirelessly by networking a smart device bluetooth module and a bluetooth serial adapter. In Android application programming industry, if we are utilized this app, be expected that we can produce apps for various types of equipments control by using smart devices.
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오프라인 매장에서 스마트 폰을 이용한 쇼핑 시스템의 설계 및 구현
권상홍(Sang Hong Kwon) 산업기술교육훈련학회 2013 산업기술연구논문지 (JITR) Vol.18 No.4
In this paper, I design and implement the shopping system that can be used in the offline stores. This system works as follows. First, you run the android shopping app. Next, you shoot the barcode of the goods using your smart phone s camera. It is sent to the server s PHP page by WiFi. The server searches the detailed informations of goods from its database based on the primary key that matches the barcode. They are returned to your app. Next, if you wish to buy it, you can add it in the buying list. The informations of the buying list are sent to the server s PHP page when you click the Buy button. Finally, you finish the app. In this system, you can find the information of goods and can know the total amount of goods in the cart without a seller s assist. Because the salespeople can be see the your buying list through the server, they do not check again the prices of things at the counter. So you can pay the money quickly. Because this system consists of one PC and one IP router, its cost is very cheap. In addition to, you do not have to pay the cost for Internet because this system uses the internal network. This system can be used in the offline stores that have no salespeople.
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김종보(Jong-Bo Kim),권상홍(Sang-Hong Kwon) 산업기술교육훈련학회 2008 산업기술연구논문지 (JITR) Vol.13 No.1
In this paper, we wish to raise the degree of a practical use of a SMART device programming technology and a Bluetooth communication programming technology by making application programs that can utilize substantially the Mobile Internet service in industrial spot. These application know-hows can be applied to programs that use SMART device at a Visual Basic programming practice, Bluetooth communication programs at a network programming practice and PLC programs in electricity, mechatronics and automation courses of study. We do practically use these technics in many programs that control a PLC device with a PC or a PDA.
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권기덕(Kwon, Ki-Duk),정준모(Jung, Jun-Mo),권상홍(Kwon, Sang-Hong) 한국산학기술학회 2006 한국산학기술학회논문지 Vol.7 No.5
본 논문은 비주기 태스크에 대한 저전력 스케줄링을 달성하기 위한 새로운 동적 전압 조절(DVS) 알고리즘을 제안한다. 벼주기 태스크는 주기(period)가 없고 발생시간(release time)과 최악실행시간(WCET) 예측이 불가능하기 때문에 기존의 DVS 알고리즘으로 스케줄링 할 수 없으므로 전력소모가 많이 발생하는 단점이 있다. 본 논문에서는 일정한 크기의 주기와 최악수행시간을 갖는 주기적인 가상태스크를 정의하고, 발생한 비주기 태스크를 가상태스크에 할당하여 이미 존재하는 주기 태스크들과 합께 DVS 스케줄링을 수행하는 알고리즘을 제안한다. 가상태스크의 주기와 최악수행 시간은 이미 존재하는 주기태스크들과 가상태스크를 모두 포함한 태스크 활용률을 계산하여, 그 값이 1에 가장 근접하는 값으로 설정한다. 제안하는 알고리즘은 기존의 주기 태스크에 대한 DVS 알고리즘보다 11%의 전력 감소 효과가 있음을 시뮬레이션을 통해 확인하였다. This paper proposes a new Dynamic Voltage Scaling(DVS) algorithm to achieve low-power schedulingof aperiodic hard real-time tasks. Aperiodic tasks schedulingcannot be applied to the conventional DVS algorithm and result in consuming energy more than periodic tasks because they have no period, non predictable worst case execution time, and release time. In this paper, we defined Virtual Periodic Task Set(VTS) which has constant period and worst case execution time, and released aperiodic tasks are assigned to this VTS. The period and worst case execution time of the virtual task can be obtained by calculating task utilization rate of both periodic and aperiodic tasks. The proposed DVS algorithm scales the frequency of both periodic and aperiodic tasks in VTS. Simulation results show that the energy consumption of the proposed algorithm is reduced by 11% over the conventional DVS algorithm for only periodic task.
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