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Study on the MQTT protocol design for the application of the real-time HVAC System
Jung, Hun The Institute of Internet 2016 International Journal of Internet, Broadcasting an Vol.8 No.1
In this paper, the existing domestic HVAC systems, devices TCP / IP does not support the most, thereby, not performed remote management, it is necessary to regularly field service, inefficiency and cost bring a burden. This is through a comparison of the IoT-based primary, real-time protocol of what has become a hot topic recently, to be able to control and real-time monitoring through the CCU device in the HVAC system. Compare for this Internet of Things device for real-time monitoring and control of the XMPP, CoAP, MQTT main real-time protocol is used on. Finally, flexibility, light weight, based on MQTT a two-way messaging protocols with reliable message delivery, implements the protocol on the real-time HVAC system in the cloud platform.
The Effect of Contact Boundary on Bulk Resistance in Hexagonal Shaped Source/Drain in FinFETs
JungHun Kim,SoYoung Kim 대한전자공학회 2015 ITC-CSCC :International Technical Conference on Ci Vol.2015 No.6
This paper analyzes the influence of contact boundary on bulk resistance in hexagonal shaped source/drain regions of FinFETs. FinFET structures have 3 dimensional source/drain regions which make the resistance modeling more challenging than that of planar MOSFETs. The resistance can be divided into extrinsic resistance components, Rcon, Rbulk, Rspr, and Rsh. TCAD analysis results show that the surrounding contact shows minimum contact resistance (Rcon) and bulk resistance (Rbulk). Also, increasing contact area makes the bulk resistance larger, whereas the contact resistance smaller. But the decrement of the resistance is relatively small in bulk resistance case. Finally, we demonstrate that surrounding contact minimizes both contact and bulk resistance.
Junghun PARK 한국생물공학회 2021 한국생물공학회 학술대회 Vol.2021 No.10
Food poisoning is caused by various causes. In most cases, food poisoning is caused by food contaminated with bacteria such as Salmonella or E. coli . To detect these bacteria, a culture method is mainly used, but the culture method has a disadvantage in that it takes a long time. Recently, molecular diagnostic technologies have been widely used to detect these bacteria. Herein, we developed a portable real-time fluorescence monitoring instrument that can apply various molecular diagnostic technologies to detect food poisoning bacteria. This instrument can measure multiple fluorescence signals simultaneously, and real-time analysis is possible. In this study, we successfully analyzed E.coli, coliform, and total bacteria from livestock processed products by using Cas12a-based isothermal fluorescence generation system with the developed instrument. Since this instrument is small and easy to use, we expect that food poisoning bacteria can be easily detected in the field by using the instrument.
Junghun Lee,Youngho Kim,김영근,박정열,김병규 한국바이오칩학회 2011 BioChip Journal Vol.5 No.1
This paper presents a polymer microcan-tilever platform for handling massive microparticles or cells using combined forces induced by dielectro-phoresis and gravity. Although cell separation based on dielectrophoresis is a very useful and versatile method, its low throughput is a key problem that must be resolved before it can be used clinically. In this study, high throughput separation could be achieved without any external pumping or complex microtubing by combining dielelectrophoresis and sedimentation. The absence of any external pumping or injection system makes it possible to realize a simple configuration of devices with low cost and easy separation procedures, which is carried out by just dropping the target microparticles without any pretreatment. The transport of microparticles is driven by gravitation in the medium, and during the sedimentation the particles are either deflected from or pass through the gap between the microcantilevers depending on their physical properties. The position of passing through is defined by the equilibrium point between the dielectrophoretic force and gravity. We compared the degree of complexity of the fabrication process and its successful throughput between both the glass-based and polymer-based microcantilevers. The feasibility of our suggestion was demonstrated by performing microparticle separation experimentally, which showed that our device can be applied in various biological areas.