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A Study on Low-Power Sensor Node based on Event-based Sampling Using Renewable Energy in Greenhouse
Hong-geun Kim,Chulyoung Park,Myeongbae Lee,Yongyun Cho,Changsun Shin,Dongguk Park,Jangwoo Park 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.3
In the paper, we proposed low-power sensor node that applied to perform events-based sampling algorithm and to harvest energy through irrigation equipment applicable in greenhouse environment. The system composition to achieve such a goal could be divided into three parts of sensors, data processing and control, and this paper suggests a solution to an unnecessary wasting energy problem by using the event-based sampling to effectively reduce data exchange between the control system composition. Sensor node based on energy harvesting are implemented through micro-hydro generators connected to the irrigation equipment and it is confirmed that transmitting or receiving stable data is possible, reducing energy consumption of sensor node by the algorithm.
Contact angle control of sessile drops on a tensioned web
Park, Janghoon,Kim, Dongguk,Lee, Changwoo Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.437 No.-
<P><B>Abstract</B></P> <P>In this study, the influence of the change of tension applied to flexible and thin web substrate on the contact angle of sessile drop in roll-to-roll system was investigated. Graphene oxide and deionized water solutions were used in the experiments. Tension was changed to 29, 49, and 69 N, and the casting distance of the micropipette and the material was set to 10, 20, and 40 mm, and the droplet volume was set to 10, 20, and 30 μL, respectively. Statistical analysis of three variables and analysis of the variance methodology showed that the casting distance was most significant for the contact angle change, and the most interesting tension variable was also affected. The change in tension caused the maximum contact angle to change by 5.5°. The tension was not uniform in the width direction. When the droplet was applied in the same direction in the width direction, it was confirmed that the tension unevenness had great influence on the contact angle up to 11°. Finally, the casting distance, which has a large effect on the contact angle, was calibrated in the width direction to reduce the width direction contact angle deviation to 1%. This study can be applied to fine patterning research using continuous inkjet printing and aerosol jet printing, which are roll-to-roll processes based on droplet handling.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The droplet contact angle can be varied by web tension. </LI> <LI> The lateral web tension difference has a significant impact on the contact angle. </LI> <LI> The contact angle in the width direction can be calibrated by the casting distance. </LI> </UL> </P>
김동국(DongGuk Kim),장성용(SeongYong Jang),이원영(WonYoung Lee),김용호(YongHo Kim),박창현(Changhyun Park) 한국정보보호학회 2009 정보보호학회논문지 Vol.19 No.5
포렌식 수사 절차상의 무결성을 입증하기 위한 방안으로 해쉬 함수 알고리즘을 적용한 디지털 증거의 경우, 무결성이 손상되면 그 자료는 폐기되어야만 했다. 즉, 주요 사건의 핵심 부분에 대한 증거 확보를 위해서는 삭제 영역에 대한 증거 복원이 필수적임에도 불구하고, 전체적인 해쉬값이 처음 해쉬값과 달라 증거 데이터가 훼손됨으로 인하여 결정적인 증거 능력 확보에 어려움이 있었다. 본 논문에서는 이와 같은 문제점을 해결하기 위한 방안으로서 새로운 모바일 포렌식 절차 모델인 Evidence-Finder (이하 E-Finder) 모바일 포렌식 절차 모델 을 제안한다. E-Finder 절차는 5개 영역의 총 15개 절차 모델로 구성되며 E-Finder 절차를 기존 NIST(National Institute of Standards and Technology)모델, Tata Elxsi Security Group 모델과 비교 및 고찰하였다. 이로 인하여, 현재까지 모바일 포렌식 분야에서 표준화 되지 않고, 검증되지 않은 방법론을 개선하는 기대효과를 달성하였다. To prove the integrity of digital evidence on the investigation procedure, the data which is using the MD 5(Message Digest 5) hash-function algorithm has to be discarded, if the integrity was damaged on the investigation. Even though a proof restoration of the deleted area is essential for securing the proof regarding a main phase of a case, it was difficult to secure the decisive evidence because of the damaged evidence data due to the difference between the overall hash value and the first value. From this viewpoint, this paper proposes the novel model for the mobile forensic procedure, named as E-Finder(Evidence Finder) , to solve the existing problem. The E-Finder has 5 main phases and 15 procedures. We compared E-Finder with NIST(National Institute of Standards and Technology) and Tata Elxsi Security Group. This paper thus achieved the development and standardization of the investigation methodology for the mobile forensics.
고장 인성 기능을 갖는 TDX - 10 ISDN 프로세서계 유지보수 소프트웨어 구현
박우구(WooGoo Park),제동국(DongGuk Je),이병선(ByungSun Lee),김영시(YoungSi Kim) 한국정보과학회 1994 한국정보과학회 학술발표논문집 Vol.21 No.1
본 고에서는 분산 환경하에서 운영 가능한 TDX-10 ISDN 전전자 교환기의 유지보수 기능 전반에 관하여 고찰하고, 기능별 개요 및 특성을 기술함으로써 시스템 구조 및 기능을 숙지하거나 이해하여 궁극적으로는 유사한 타 시스템의 설계시 전략제공 및 차세대 교환기 설계 및 구현을 쉽게 하는데 촛점을 두고 기술하였다. TDX-10 ISDN 전전자 교환기 시스템 소프트웨어는 크게 운용관리, 유지보수, 호처리, 그리고 텔레포니계 정합 소프트웨어 등 4가지로 구성되어 있으며, 유지보수 기능은 수행하는 대상에 따라 프로세서계와 텔레포니계로 나뉘게 된다. 본 고에서는 프로세서계의 유지보수 기능을 중심으로 소프트웨어 설계 개념, 구현목표, 세부 기능 그리고 고장 인성과정에 대해서 기술하였다.
Towards an Intelligent Livestock Farm Management using OWL-based Ontology Model
Saraswathi Sivamani,Jangwoo Park,Changsun Shin,Kyungryong Cho,Dongguk Park,Yongyun Cho 보안공학연구지원센터 2015 International Journal of Smart Home Vol.9 No.4
In this paper, we have designed the ontology model to achieve a cost effective livestock farm environment by maintaining safety and quality. The proposed model is built with the situational context aware data by making use of the wireless sensor network (WSN). The concepts of the proposed model are identified after considering all the possibilities with respect to the control services that help to increase the productivity and automation in the livestock farm environment. The health and diet management along with the environmental services are considered as a main service, which is a deniable fact. In addition to these services, uprising and downsizing of stock prices can affect the management behavior in regard to the production services. In order to solve the issue, both the health and diet management plans are monitored and modified automatically with respect to the changes in the stock market. With the proposed ontology model, the information from Internet of Things (IoT) is recomposed as context information, which helps in the understanding of the relationship between the livestock environmental factors.