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박지호,김동식 순천향대학교 부설 산업기술연구소 2021 순천향 산업기술연구소논문집 Vol.27 No.2
Goldman Sachs recently laid off 598 top talents, while Google and NASA established a singularity university. As we enter the era of the 4th Industrial Revolution, each company and university is nurturing talent for the age of artificial intelligence(AI). As factories and various facilities are automated and AI and the Internet of Things (IoT) enter homes and businesses, interest in automation is gradually increasing, and AI robots are replacing human jobs. Therefore, a study was conducted on the implementation of a sorting robot for smart factory automation. The hardware of the robot was realized using TETRIX, and it was configured to recognize the color of blocks and classify the object using NXT color sensors. The color sensor is used to determine the type of a block and a linetracer is to help figure out location, and the block was placed in the right place. The control program was implemented using LabVIEW, and the NXT was implemented to control the robot through the signal obtained from the color sensor.
Jiho Ryu,Chang-Gun Lee,Kwon, T.T.,Junghee Han IEEE 2009 IEEE SENSORS JOURNAL Vol.9 No.10
<P>Wireless sensor networks have great potentials to be applied to mission critical real-time applications such as target tracking, emergency detection, and disaster management. For such real-time applications, sensory data should be delivered within the end-to-end deadlines; otherwise, the data may become useless or misleading. In order to provide such deterministic guarantee of end-to-end deadlines, not only packet scheduling within a single hop but also routing across multiple hops have to be jointly considered. In this paper, we propose a combined scheduling and routing mechanism that provides a deterministic guarantee of end-to-end deadlines leveraging real-time scheduling and analysis techniques. Our experimental study shows that the proposed mechanism can accommodate a larger workload meeting all the end-to-end deadlines than a pretty comprehensive set of other possible solutions of scheduling and routing that are known to deterministically guarantee end-to-end deadlines.</P>
Jiho Shin,Subin Kim,Sejong Oh Korean Society of Dairy Science and Biotechnology 2023 Journal of Dairy Science and Biotechnology (JMSB) Vol.41 No.3
In this study, Lactococcus lactis subsp. hordniae JNU533 (JNU533) was isolated from Swiss-type cheese, and the bacteriocin produced by this strain was characterized. The spot-on-lawn assay was used to determine the antimicrobial spectrum and characteristics of the JNU533-derived bacteriocin. Results confirmed that the JNU533-derived bacteriocin inhibited the growth of lactic acid bacteria. The size of the bacteriocin was approximately 4.9 kDa, and it was heat- and pH-stable under various temperature and pH conditions. Furthermore, the possibility of using JNU533 as a starter culture in the manufacturing of fermented dairy products was assessed. A single colony of JNU533 was inoculated into 10% skim milk containing 0.5% glucose to investigate its characteristics in milk culture. The decrease in the pH was similar to that elicited by Lactobacillus delbrueckii subsp. bulgaricus. Furthermore, the results confirmed that JNU533 inhibited the growth of various bacteria and could be used as a milk fermentation starter. This study highlights the characteristics of the bacteriocin produced by JNU533 and the growth features of this strain in a skim milk medium.
A review on a 4 K cryogenic refrigeration system for quantum computing
Jiho Park,Bokeum Kim,Sangkwon Jeong 한국초전도저온학회 2022 한국초전도저온공학회논문지 Vol.24 No.2
This paper reviews the literature that has been published since 1980s related to cryogenic refrigeration systems for quantumcomputing. The reason why such a temperature level of 10-20 mK is necessary for quantum computing is that the superconductingqubit is sensitive to even very small thermal disturbances. The entanglement of the qubits may not be sustained due to thermalfluctuations and mechanical vibrations beyond their thresholds. This phenomenon is referred to as decoherence, and it causes ancomputation error in operation. For the stable operation of the quantum computer, a low-vibration cryogenic refrigeration system isimperative as an enabling technology. Conventional dilution refrigerators (DR), so called ‘wet’ DR, are precooled by liquid helium,but a more convenient and economical precooling method can be achieved by using a mechanical refrigerator instead of liquidcryogen. These ‘dry’ DRs typically equip pulse-tube refrigerators (PTR) for precooling the DRs around 4 K because of its particularadvantage of low vibration characteristic. In this review paper, we have focused on the development status of 4 K PTRs and furtherpotential development issues will be also discussed. A quiet 4 K refrigerator not only serves as an indispensable precooler of DRbut also immediately enhances the characteristics of low noise amplifiers (LNA) or other cryo-electronics of various type quantumcomputers.
Theoretical Study on the Reaction of Sabinene with NO3
Jiho Park,김학준 대한화학회 2020 Bulletin of the Korean Chemical Society Vol.41 No.2
Reaction of sabinene with nitrate radical.