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직류 전원선을 이용한 다중 접속 양방향 직렬통신 프로토콜 구현
한경호(Kyongho Han),김원일(Kim Won-Il),황하윤(Hwang Ha-Yoon) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper handles, implementation of multiple access bidirectional serial communications protocol using two common DC power lines, whict are power supply and ground, connecting multiple devices. Communication between the host and the multiple clients are performed using unique packet data with device ID unique to each devices connected on the common power lines. Host initiates data communications by transmitting command packet to the designated client with the client"s ID and the client responds by transmitting response packet to the host and in this way, multiple clients and host exchange the packet through the common power lines. The normal voltage of the power communication line maintains 24V corresponding to level 1 and the host drops the voltage to 12V on sending level 0 signal, also the clients normally keeps the line voltage to 24V use pull-down circuit to drop the voltage to 12V on sending level 1 signal. Power supply originates from the host, the host senses the voltage level of the power communication lines and when the clients activates pull down circuit to send level 0 signal and the voltage drops to 12V, the hosts switches power source from 24V to 12V. Also, when clients deactivate pull down circuit to send level 1 signal, the host senses the voltage increase and switches the power source from 12V to 24V. Experimental circuit is designed with one hosts and four clients and verified the power line voltage switching operation depending on the data signal levels on the power line. The proposed research result can be applied to two wire power communications system with one host and multiple low current consumption clients.
금은화와 회화나무꽃으로부터 항산화성분의 추출 : 중심합성계획모델을 이용한 최적화
한경호 ( Kyongho Han ),줘청량 ( Chengliang Zuo ),홍인권 ( In Kwon Hong ) 한국공업화학회 2019 공업화학 Vol.30 No.3
본 연구에서는 금은화와 회화나무꽃으로부터 항산화성분을 추출하는 용매추출공정의 최적화를 위해 반응표면분석법 중 중심합성계획모델을 이용하였다. 반응표면분석법의 반응치로는 추출수율과 DPPH 라디칼소거활성을 설정하였고, 독립변수로는 추출시간, 주정/초순수 부피비, 추출온도 등을 설정하였다. 중심합성계획모델로 최적화과정을 수행한 결과 금은화의 경우 최적조건은 추출시간(2.08 h), 주정/초순수의 부피비(41.53 vol.%), 추출온도(55.08 ℃)이었으며, 이때 수율(37.38 wt.%), DPPH 라디칼소거활성(40.37%) 값을 나타내었다. 또한 회화나무꽃의 경우 추출시간(2.13 h), 주정/초순수의 부피비(62.89 vol.%), 추출온도(50.42 ℃)에서 개별 최대값인 수율(35.43 wt.%), DPPH 라디칼소거활성(55.27%) 값을 나타내었다. In this study, an antioxidant was extracted from Lonicera japonica and Sophora japonica L, which was optimized by using the central composite design (CDD) model of response surface methodology (RSM). The response value of CDC model establishes the extraction yield and the 2,2-diphenyl-1-picrylhydrazyl (DPPH) radical scavenging activity. The extraction time, volume ratio of ethanol/ultrapure water, and extraction temperature were selected as quantitative factors. According to the result of CDC, optimal extraction conditions of Lonicera japonica were as follows; the extraction time of 2.08 h, volume ratio of ethanol/ultrapure water of 41.53 vol.%, and extraction temperature of 55.08 ℃. At these conditions the expected results indicated that the yield and DPPH radical scavenging activity were estimated as 37.88 wt% and 40.37%, respectively. On the other hand, optimal extraction conditions of Sophora japonica L. could be found as the extraction time of 2.13 h, volume ratio of ethanol/ultrapure water of 62.89 vol.%, and temperature of 50.42 ℃. Under the conditions, the (possible) maximum values of yield and DPPH radical scavenging activity were found as 35.43 wt% and 55.7%, respectively.
ARM프로세서를 이용한 RS232C와 TCP/IP 접속장치의 구현
이영준(Youngjun Lee),한경호(Kyongho Han) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, the connection device of RS232C and TCP/IP implementation using ARM processor and LINUX is proposed. Data interaction flash memory the multiple serial ports are transferred to ARM processor and the data are processed and formed into data packet for transfer via internet protocol. Packet flash memory internet is decoded to extract the serial port data. The serial ports supports RS232C asynchronous protocol communication and control program is developed in GNU -C and installed in the on-board memory for packet conversion and control The research result can be applied to terminal server, printer server and multiple serial ports equipments.
ARM 프로세서와 LINUX를 이용한 마이크로 웹서버 구현
이동훈(DongHoo Lee),한경호(Kyongho Han) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
In this paper, we proposed the micro web-server implementation on Strong ARM processor with embedded Linux The parallel port connecting parallel I/O is controlled Via HPPT protocol and web browser program HTTP protocol is ported into Linux and the micro web server program and port control program are installed on-board memory using CGI to be accessed by web browser, such as Internet Explore and Netscape 8bit LED and DIP switches are connected to the processor port and the switch input status is monitored and the LED output is controlled from remote hosts vie internet. The result of the proposed embedded micro-web server can be used in automation systems, remote distributed control Via internet using web browser