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33 results on '"Hong, Jisoo"'

10. Analysis of an optical depth converter used in a three-dimensional integral imaging system

Author

Min, Sung-Wook, Hong, Jisoo, and Lee, Byoungho

Subjects
Optics -- Research, Imaging systems -- Research, Image processor, Imaging technology, Astronomy, Physics
Abstract

An optical depth converter that uses a lens array pair is analyzed theoretically and experimentally. We present a theory of depth conversion and explain the effects of the system parameters in the optical depth converter by using wave-optical analysis. Ray-optical analysis is applied to the investigation of the tendencies of the system parameter effects. We also show that the optical depth converter can be used for the three-dimensional screen in projection-type integral imaging systems. OCIS codes: 110.2990, 100.6890, 220.2740.

Published
2004

15. Purification and Characterization of Pasteuricin Produced by Staphylococcus pasteuriRSP-1 and Active against Multidrug-Resistant Staphylococcus aureus

Author

Hong, Jisoo, Kim, Jonguk, Quan, Lin-Hu, Heu, Sunggi, and Roh, Eunjung

Abstract

Staphylococcus aureusis an important pathogen implicated in various diseases, including staphylococcal food poisoning. Bacteriocins are considered safe and effective antimicrobial substances for the prevention of the growth of pathogenic bacteria. In this article, we describe the purification and characterization of pasteuricin, a novel bacteriocin produced by Staphylococcus pasteuriRSP-1. A cell-free supernatant of S. pasteuriRSP-1 exerted strong antimicrobial activity against staphylococci, including methicillin-resistant S. aureus(MRSA), and gram-positive bacteria. The loss of antimicrobial activity upon treatment with proteolytic enzymes confirmed the proteinaceous nature of pasteuricin. A rapid and pronounced bactericidal effect of pasteuricin was confirmed by a live-dead bacterial viability assay. To our knowledge, pasteuricin is the first reported S. pasteuribacteriocin that inhibits S. aureus. Because pasteuricin is characterized by strong antimicrobial activity and high stability, it has potential as an alternative antimicrobial agent to antibiotics.

Published
2018
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31. Compact collimated display system using an aspherical screen combined with interaction

Author

Kim, Youngmin, Moon, Joosung, Hong, Sunghee, Kwon, Ji-In, Hong, Jisoo, and Kang, Hoonjong

Abstract

A compact collimated display system using an aspherical screen with a concave mirror is proposed. As the collimated display can provide a long viewing distance for the observer, it is commonly used for personal virtual flight simulators. To deliver a collimated image, the conventional collimated display requires a large system, but by using an aspherical screen with a concave mirror, the system size can be diminished. In this paper, a method of designing the compact collimated display system is demonstrated with simulation and experiment results. Also, a floating display and a depth camera for detecting hand gestures were combined with the proposed system for interaction.

Published
2015
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32. Three-dimensional display technologies of recent interest: principles, status, and issues [Invited]

Author

Hong, Jisoo, Kim, Youngmin, Choi, Hee-Jin, Hahn, Joonku, Park, Jae-Hyeung, Kim, Hwi, Min, Sung-Wook, Chen, Ni, and Lee, Byoungho

Abstract

Recent trends in three-dimensional (3D) display technologies are very interesting in that both old-fashioned and up-to-date technologies are being actively investigated together. The release of the first commercially successful 3D display product raised new research topics in stereoscopic display. Autostereoscopic display renders a ray field of a 3D image, whereas holography replicates a wave field of it. Many investigations have been conducted on the next candidates for commercial products to resolve existing limitations. Up-to-date see-through 3D display is a concept close to the ultimate goal of presenting seamless virtual images. Although it is still far from practical use, many efforts have been made to resolve issues such as occlusion problems.

Published
2011

33. Super-antibiofilm effect of N2 plasma treated buffer (NPB) against plant pathogenic bacterium.

Author

Seo, Hyemi, Hong, Jisoo, Kim, Taeyeol, Choi, Won ll, Sung, Daekyung, and Moon, Eunpyo

Subjects
*PHYTOPATHOGENIC bacteria, *PLANT capacity, *PSEUDOMONAS syringae, *BACTERIAL inactivation, *REACTIVE oxygen species, *BACTERIAL diseases, *PATHOGENIC bacteria
Abstract

Controlling of biofilms formation in numerous pathogenic bacteria is one of the most difficult tasks in the control of bacterial diseases. Plasma has attracted extensive attention due to their potential applications for effective inhibiting of biofilm. Recently, plasma-activated water (PAW) has developed as an alternative method for bacterial inactivation and disinfection of foods owing to advantages of more convenient and efficient storage and transportation than direct plasma application. However, most previous studies about PAW have only focused on the improvement of its antibacterial effect instead of antibiofilm activity. Therefore, we report the development of N2 plasma treated buffer (NPB) and the super-antibiofilm effect of NPB against Pseudomonas syringae pv. tomato DC3000 (Pst DC3000) as a plant pathogenic bacterium. Scavenger assays using various antioxidants revealed that reactive oxygen species were involved in the inhibitory cellular actions of NPB, with H2O2 and singlet oxygen proving essential for bacterial death. Intensive analysis of NPB, stored at different periods and temperatures, showed that the antimicrobial efficacy was well maintained for 3 months at − 80 °C. Importantly, further studies showed that NPB effectively inhibited not only the growth of planktonic Pst DC3000 but also biofilm formation. The remarkable inhibition on the biofilm was analyzed and visualized using LIVE/DEAD viability assays and confocal laser scanning microscopy (CLSM) imaging. The 3D CLSM imaging data revealed that the bactericidal activity of NPB was permeable enough to affect the cells embedded inside the biofilm. This prominent permeability could be a crucial feature of NPB contributing to effective super-antibiofilm. [ABSTRACT FROM AUTHOR]

Published
2019
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