• Journal of Microbiology and Biotechnology
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• v.19 no.12
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• pp.1573-1575
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• 2009

Bioassay-guided fractionation of the culture broth of Aspergillus sp. FN070449 (KCTC 26428) using a DPPH (2,2-diphenyl-1-picrylhydrazyl) assay led to the isolation of two compounds: reticulone (1) and reticulol (2). Their chemical structures were elucidated on the basis of UV, IR, NMR, and MS spectroscopic analyses. Compound 1 exhibited more potent free radical scavenging activity on $ABTS^{\cdot+}$ (2,2'-azino-bis [3-ethylbenzthiazoline-6-sulphonic acid]) and DPPH radicals than did butylated hydroxyanisole (BHA) and caffeic acid.

• Proceedings of the Korea Multimedia Society Conference
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• 2012.05a
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• pp.22-25
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• 2012

본 논문에서는 키보드나 마우스와 같은 인풋 디바이스 없이 손동작만으로 컴퓨터를 조작할 수 있는 차세대 인터페이스인 에어 인터페이스를 구현하였다. 이 시스템 구현을 위해 먼저 적외선 카메라와 적외선 LED를 사용하였고, 또한 적외선의 전반사의 원리를 이용하였다. 이를 통해 획득된 적외선 영상은 다양한 영상처리 기술을 통해 손 영역을 분할, 검출하게 되고, 검출된 정보를 이용하여 다양한 메타포를 구현 하였으며, 최종적으로 개별적인 제어 이벤트에 각각 맵핑되어 컴퓨터를 제어 및 동작하는 과정을 수행하게 된다. 본 연구에서는 손 영역의 검출과 추적, 인식과정 등을 자세히 서술하였으며, 다양한 메타포도 함께 소개가 된다. 그리고 본 연구에서 사용된 기술을 더욱 발전시키면 사회 전반적으로 다양한 부분에서 적극 활용될 것으로 기대된다.

• Proceedings of the KIEE Conference
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• 2006.10c
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• pp.582-584
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• 2006

This paper describes a monocular PSD-based motion capture sensor to employ with commercial video game systems such as Microsoft's XBOX and Sony's Playstation II. The system compact, low-cost, and only requires a one-time calibration at the factory. The system includes a PSD(Position Sensitive Detector) and active infrared (IR) LED markers that are placed on the object to be tracked. The PSD sensor is placed in the focal plane of a wide-angle lens. The micro-controller calculates the 3D position of the markers using only the measured intensity and 2D position on the PSD. A series of experiments were performed to evaluate the performance of our prototype system. From the experimental results we see that the proposed system's compact size, low-cost, ease of installation, and high frame rates are suitable for high speed motion tracking in games.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.05a
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• pp.941-944
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• 2007

본 연구에서는 센서 네트웍과 컴퓨터 비전 시스템을 이용한 모바일 센서 네트워크(Mobile Sensor Network) 의 응용에 관한 실험을 수행하였다. 주된 내용으로는 모바일 센서를 탑재한 차량을 이용한 로컬라이제이션(Localization) 과 팀원 인식(Team Identification) 등에 관련된 방법을 포함한다. 본 시스템은 시뮬레이션을 통하여 기획을 하였으며 자체 설계한 하드웨어와 내장형 소프트웨어를 탑재하여 주어진 기능을 수행하도록 하도록 하는 한편, 모바일 센서의 역할을 할 수 있도록 다양한 센서를 장착할 수 있도록 설계되었다. 또한 전자나침반을 이용한 방위각 측정능력, 초음파 센서를 이용한 근거리 장애물 회피 능력, 적외선 발광 다이오드(IR-LED)와 적외선 필터를 씌운 카메라를 이용한 동료의 위치 파악 능력등을 통하여 로컬라이제이션에 도움이 되도록 한다. 통신을 위하여 IEEE 802.11g 프로토콜에 기반을 둔 통신 능력을 가지며 차량간의 통신도 같은 프로토콜을 통하여 이루어지게 된다.

• Proceedings of the IEEK Conference
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• 2008.06a
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• pp.1025-1026
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• 2008

This paper describes a monocular PSD-based motion capture sensor to employ with commercial video game systems such as Microsoft's XBOX and Sony's Playstation II. The system includes a PSD(Position Sensitive Detector) and active infrared (IR) LED markers that are placed on the object to be tracked. The micro-controller calculates the 3D position of the markers using only the measured intensity and the 2D position on the PSD. A series of experiments were performed to evaluate the performance of our prototype system. From the experimental results we see that the proposed system has the advantages of the compact size, the low cost, the easy installation, and the high frame rates to be suitable for high speed motion tracking in games.

• Natural Product Sciences
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• v.12 no.3
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• pp.125-128
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• 2006

A chemical examination of the stems of Sapium japonicum PAX et $H_{OFFM}$ (Euphorbiaceae) has led to the isolation of seven phenolic compounds. On the basis of UV, IR, MS, and NMR spectral data and the chemical reaction, the structures of these compounds were identified as gallic acid (1), ellagic acid (2), 3,3'-di-O-methylellagic acid (3), $4-O-({\beta}-D-xylopyranosyl)-3,3'-di-O-methylellagic$ acid (4), $4-O-({\alpha}-D-arabinofuranosyl)-3,3'-di-O-methylellagic$ acid (5), isoquercitrin (6), and geraniin (7).

• Bulletin of the Korean Chemical Society
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• v.26 no.3
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• pp.447-450
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• 2005

The crude methanol extract of the fruits of Amomum tsao-ko (Zingiberaceae) showed cytotoxic activity. Bioactivity-guided separation led to the isolation of a diarylheptanoid, tsaokoarylone [7-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)-hepta-4E,6E-dien-3-one] (2). 2 showed cytotoxicity at 4.9 and 11.4 $\mu$g/mL ($IC_{50}$) against human nonsmall cell lung cancer A549 and human melanoma SK-Mel-2, respectively, determined by SRB colorimetric method. During purification-(4-hydroxyphenyl)-4-hydroxyhexan-2-one (4) together with three known diarylheptanoids was also isolated. Their structures were determined from interpretation of spectroscopic data (IR, UV, MS, and NMR) and synthesis confirmed the structure of 2.

• The Journal of Korean Medicine Ophthalmology and Otolaryngology and Dermatology
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• v.17 no.1
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• pp.126-130
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• 2004

Objectives; Bioassay-directed fractionation of the dried roots of Salvia miltiorrhiza led to the isolation of abietane tanshinones, crptotanshinone and dihydrotanshinone. Methods: Their structures were elucidated using 1H-and 13C-NMR, UV, IR and mass spectral analysis. Result and Conclusions : These compounds exhibited a moderate antimicrobial activities against Staphylococcus epidemidis, Staphylococcus aureus, Staphylococcus pyogene. Actinobacillus actinomycetemcomitans, Escherichia coil, Enterbacter cloacae, Pseudomonas aeruginosa, Citrobacter freundii, and Samonella typhimurium.

• Rapid Communication in Photoscience
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• v.2 no.1
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• pp.24-27
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• 2013

A polymeric photobase generator containing oxime-urethane groups is applied to a fluorescence micropatterning material. Polymer bearing oxime-urethane groups was prepared by copolymerization of methyl methacrylate with methacryloyloxyethyl benzophenoneoxime urethane (MBU). The reaction of amino groups in the irradiated copolymer film with dansyl chloride (Dns-Cl) was monitored by using UV absorption, IR absorption and fluorescence spectroscopy. The fluorescence spectrum of the Dns-Cl-treated irradiated copolymer film shows a strong fluorescence with a fluorescence maximum wavelength at 510 nm. A blue fluorescent micropattern with a line width of $2{\sim}3{\mu}m$ was obtained. Treatment of the irradiated copolymer film with Dns-Cl and rhodamine B mixture led to the formation of green, red, and orange-colored fluorescence micropatterns. Thus, various colored micropatterns on a single polymer film can be obtained by selective excitation of each dye molecules.

• Mycobiology
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• v.37 no.1
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• pp.31-36
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• 2009

A phytochemical study on the flower of Calotropis gigantea (Linn.) using silica gel column chromatography and preparative thin layer chromatography, led to the first time isolation of Di-(2-ethylhexyl) phthalate (compound 1) and anhydrosophoradiol-3-acetate (compound 2). The structures of these compounds were confirmed by spectroscopic analyses (IR, HRTOFMS and NMR). The antibacterial and antifungal activities of ethyl acetate extract, compound 1 and compound 2 were measured using the disc diffusion method. Ethyl acetate extract and compound 1 presented better results than compound 2. The minimum inhibitory concentrations (MICs) of the extract and compounds were found to be in the range of $16{\sim}128{\mu}g/ml$. The cytotoxicity ($LC_{50}$) against brine shrimp nauplii (Artemia salina) were also evaluated and found to be 14.61 ${\mu}g/ml$ for ethyl acetate, 9.19 ${\mu}g/ml$ for compound 1 and 15.55 ${\mu}g/ml$ for compound 2.