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IoT 기반의 효율적인 스마트도서관 자원 관리 시스템 개발
이주화,이명숙,Lee, Joohwa,Lee, Myungsuk 디지털산업정보학회 2019 디지털산업정보학회논문지 Vol.15 No.2
In this study, we constructed a system to operating and manage the resources of the Smart Library Reading Room automatically using the Internet of things. The persistent problem of smart library or unattended library is electric energy waste and efficient seat management. The electricity and seat layout management method of the existing library reading room is being treated as concentrated management in the central system. However, this approach results in wasting electricity and seats do not provide a fair opportunity for each user. In this study, IoT sensor was used to turn off electricity and empty seat for about 20 minutes, so that it could be marked as vacant and managed efficiently, so that opportunities for seats were evenly maintained. In the future, we will improve this and construct a model in the reading room of actual village library or school library, and analyze and reflect the result.
강화약쑥 수용성 추출물의 식물 타감효과 및 HPLC에 의한 타감물질 분석 연구
이주화,변지희,김명수,박춘근,박충범,차선우,이정훈,조준형,Lee, Joo-Hwa,Byeon, Ji-Hui,Kim, Moung-Su,Park, Chun-Geon,Park, Chung-Berm,Cha, Sun-Woo,Lee, Jeong-Hoon,Cho, Joon-Hyeong 한국유기농업학회 2013 韓國有機農業學會誌 Vol.21 No.4
This study was conducted to evaluate the allelopathic effect of aqueous extract of Ganghwa domestic mugwort (Artemisia spp.) on vegetables and its related allelo-chemicals. When the receptor vegetables, such as Chinese cabbage, lettuce, and red radish, were treated with aqueous extract obtained from Sajabalssuk (A. $sp^*I$), Ssajuarissuk (A. $sp^*II$) or Ssajarissuk (A. $sp^*III$), their germination rate, leaf number, plant height, and root length were restricted with increasing concentration of aqueous extract. Allelopathic effect was the highest in radish, than lettuce and Chinese cabbage in order. The growth of topplant were more inhibited then root growth observing in restriction of plant height, root length, and chlorophyll contents. The plant height, the root length of red radish were 53.3 and 61.2% and their fresh weights were 19.8 and 26.4% compared to those of controls, respectively. A. $sp^*III$ showed the highest allelopathic effect among the donor plants. In HPLC analysis, 7 phenol compounds were identified in A. $sp^*I$ and A. $sp^*II$, and, in A. $sp^*III$, and hydroxybenzoic acid and phenylacetic acid were further identified as allelochemicals. It is considered that their plant growths were variously inhibited by the amounts and types of allelochemicals in aqueous extracts. To increase the productivity of farm land after cultivation of mugwort, these results can be useful to select the following field crops.
강화약쑥 추출물이 종자발아 및 유식물 생장에 미치는 알레로파시 효과
이주화,변지희,이정훈,박춘근,박충범,조준형,Lee, Joo-Hwa,Byeon, Ji-Hui,Lee, Jeong-Hoon,Park, Chun-Geon,Park, Chung-Berm,Cho, Joon-Hyeong 한국유기농업학회 2012 韓國有機農業學會誌 Vol.20 No.4
This study was conducted to identify allelopathic effect of Ganghwa domestic Artemisia spp., named Sajabalssuk and Ssajuarissuk, for various receptor plants including clover (Trifolium repens L.), alfalfa (Medicago sativa L.), lawn grass (Zoysia japonica Steud.), dandelion (Taraxacum platycarpum Dahlst.), and dahurianpatrinia (Patrinia scabiosaefolia Fisch. ex Trevir). Receptor plants were treated with the aqueous and essential oil extract of Artemisia plants. In consequence, their allelopathic effects were evaluated by measuring seed germination rates, seedling growth, and dry weights of the receptor plants. The seed germination and seedling growth of the receptor plants were inhibited by all treatments of both aqueous and essential oil extracts of the Artemisia plants, and, in addition, the inhibitory effects were increased according to the higher concentration. Among the donor plants, A. $sp.^*III$ showed most effective allelopathic effect. Comparing the alleopathic effect among the receptor plants, seed germination was most inhibited in lawn grass while inhibitory effect of seedling growth was comparatively higher in dandelion. Although inhibitory effects were comparatively lower, the allelopathic effects of Artemisia plants were identified in clover and alfalfa since the seedling growth of these plants were inhibited more than 70%. Thus, in result, Ganghwa domestic Artemisia spp. could be possibly used for weed control since natural products of the plants showed inhibitory effects on seed germination and seedling growth of various receptor plants.
자바카드 기반 무선단말기용 사용자 인증 프로토콜의 설계 및 구현
이주화,설경수,정민수,Lee, Ju-Hwa,Seol, Kyoung-Su,Jung, Min-Soo 한국정보처리학회 2003 정보처리학회논문지 C : 정보통신,정보보안 Vol.10 No.5
자바카드는 스마트카드 플랫폼에 자바의 기술을 접목시킨 것으로 스마트카드와 같은 작은 메모리를 가진 임베디드 장치를 위한 프로그래밍에 필요한 패키지와 클래스를 정의하고 있다. 또한, 자바카드는 국제 표준인 ISO-7816과 산업 명세 표준인 EMV와 호환된다. 그러나, 현재 국내외적으로 USIM이 장착된 IMT-2000에 자바카드를 이용한 사용자 인증 프로토콜을 지원하고 있지 않다. 본 논문은 표준화된 3GPP 규격(SMS), 자바카드 기술규격(APDU) 그리고 암호화 기술 등을 사용하여 자바카드 기반 무선단말기에 적용 가능한 사용자 인증 프로토콜을 설계 및 구현하였다. 표준화된 기술을 이용한 자바카드 사용자 인증 기능 지원으로 자바카드 응용 프로그램 개발 지원 도구의 보안 기능, 무선상거래, 무선보안, 전자지불시스템, 모바일 인터넷, 위치서비스 그리고 유비쿼터스 컴퓨팅 환경 등에 적용 가능하다. Java card is one of promising smart card platform with java technology. Java card defines necessary packages and classes for Embedded device that have small memory such as smart card Jana card is compatible with EMV that is Industry specification standard and ISO-7816 that is international standard. However, Java card is not offers user authentication protocol. In this paper, We design and implement an user authentication protocol applicable wireless devices based on Java Card using standard 3GPP Specification (SMS), Java Card Specification (APDU), Cryptography and so on. Our Java Card user authentication techniques can possibly be applied to the area of M-Commerce, Wireless Security, E-Payment System, Mobile Internet, Global Position Service, Ubiquitous Computing and so on.
펨토셀 네트워크에서 수익 극대화를 통한 다운링크 전력 제어 기법
이주화(Joohwa Lee),허림(Rim Haw),홍충선(ChoongSeon Hong) 한국정보과학회 2014 정보과학회논문지 : 정보통신 Vol.41 No.2
펨토셀 사업자는 FAP(Femto Access Point)의 수익을 극대화하기를 원한다, 그래서 FAP는 전송전력을 높여 FEU(Femtocell End Users)의 다운링크 데이터 속도를 높게 설정함으로써 수익을 증가시킨다. 하지만 FAP의 전송전력을 높이게 되면 MEU(Macrocell End Users)와 해당 FAP의 인접한 FAP에 서비스를 받고 있는 FEU에는 강한 간섭이 발생하게 된다. 이로 인해 MUE 및 FEU의 서비스 품질(Qos)은 저하될 수 있다. 본 논문은 펨토셀 네트워크에서 펨토셀 기지국의 전송전력을 조절하여 펨토셀 간 갑섭과 매크로셀과 펨토셀의 간섭을 완화하고, FEU의 최적의 다운링크 속도를 설정하여 FAP의 수익을 극대화하는 프레임 워크를 제안한다. 또한 수익 극대화 문제는 convex문제이고, convex 최적화 방법으로 해결될 수 있음을 보여준다. 마지막으로 시뮬레이션을 통해 이 문제의 유효성을 검사한다. Femtocell operator wants to maximize the profit of FAP(Femto Access Point). So, FAP increases its own profit by setting downlink rate for FEU high to increase its transmission power. However, when the FAP increases the transmit power, the strong interference occurs to MEUs(Macrocell End Users) and FEUs which are receiving services from adjacent FAP. Due to this, QoS(Quality of Service) of MUEs and FEUs can be degraded. In this paper, we study to mitigate interference between femtocells and between macrocell and femtocell by adjusting the transmit power of FAP, and propose framework to maximize revenue of FAP by setting optimal downlink rate of FEU. And in this paper, we show that the revenue maximization problem is a convex problem and can be solved directly by any convex tool. Finally, extensive numerical analysis is used to validate our derivation.