국내 실내환경의 부유진균 연구 동향 및 농도분포

주상우,양성익,윤성원,김경환,조은민,장석원,조용성,이철민 한국실내환경학회 2013 한국실내환경학회지 Vol.10 No.1

The objective of this study is to support an environmental policy related to the improved control of indoor airborne fungi in Korea. We reviewed 15 articles published in Korea to analyse the trend of airborne fungi level in indoor environment of various public facilities. The maximum mean concentrations of total airborne fungi in hospital and kindergarten were 1447 CFU/㎥ and 1259 CFU/㎥, respectively. We concluded that policy determination are urgently required to guide a proper management on airborne fungi in Korea.

2P-109 Self-healing Hydrogels Based on the Lysine and Sodium Alginate by Imine Crosslinking Reaction

주상우,정다함,김선목,정선호 한국공업화학회 2017 한국공업화학회 연구논문 초록집 Vol.2017 No.1

Self-healing hydrogels have drawn significant attention because it can result in longer lifespans and more applications than classical hydrogels. Here, a self-healable hydrogel was formed via reversible imine formation between aldehyde groups of oxidized sodium alginate (OSA) and amino groups of Lysine. We also added the functionalized β-cyclodextin (βCD) into the gel to confer new functionality. The structure and the mechanical performances of hydrogels were characterized by FT-IR, SEM, a rheometer, and a tensile testing machine. Also, drug delivery of the hydrogels was performed to investigate potential use in biomedical field.

Electric Field-induced Charge Transfer of (Bu4N)2[Ru(dcbpyH)2-(NCS)2]on Gold, Silver, and Copper Electrode SurfacesInvestigated by Means of Surface-enhanced Raman Scattering

주상우 대한화학회 2007 Bulletin of the Korean Chemical Society Vol.28 No.8

The potential-induced charge transfer of the dye (Bu4N)2[Ru(dcbpyH)2-(NCS)2] (N719) on Au, Ag, and Cu electrode surfaces has been examined by surface-enhanced Raman scattering (SERS) in the applied voltage range between 0.0 and -0.8 V. N719 is assumed to have a relatively perpendicular geometry with its bipyridine ring on the metal surfaces. A strong appearance of the carboxylate band at ~1370 cm-1 indicates that the carboxyl group will likely be deprotonated on the metal surfaces. As the electric potential is shifted from 0.8 to 0.0 V, the n (NCS) band at ~2100 cm-1 on the electrode surfaces appears to undergo a shift in frequency and intensity change. This indicated that the charge transfer between the dye and metal electrode surfaces had occurred. Electric-field-dependent charge transfer differs somewhat depending on the type of metal surfaces as suggested from the dissimilar frequency positions of the n (NCS) band.

pH-Dependent Surface-enhanced Raman Scattering Analysis of Maleimide and Succinimide on Ag Nanocolloidal Surfaces

주상우 대한화학회 2008 Bulletin of the Korean Chemical Society Vol.29 No.9

The adsorption structure and binding of maleimide (MI) and succinimide (SI) on silver nanocolloidal surfaces have been comparatively investigated by means of pH-varied surface-enhanced Raman scattering (SERS). The two molecules appeared not to adsorb onto Ag surfaces at pH values below 5. The appearance of a ring ν (CH) band at ~3100 cm−1 denoted the standing geometry of MI’s aromatic ring on Ag. The absence or weakness of in-plane vibrational modes of MI and SI also supported a perpendicular orientation of MI and SI on Ag from the electromagnetic selection rule. Density functional theory (DFT) calculations were employed to examine the vibrational frequencies of MI’s and SI’s neutral and anionic states.

A new hydrodynamic instability in ultra-thin film flowsinduced by electro-osmosis

주상우 대한기계학회 2008 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.22 No.2

A new hydrodynamic instability is identified for a nanofluidic flow. The flow analyzed is an electro-osmotic flow of a thin liquid layer, bounded below by a solid substrate and above by an inert gas. The Debye-Hűckel approximation is used for the potential distribution, and the interface with the gas is treated as a moving boundary. The stability analysis shows that the flow is always unstable to small-wavenumber disturbances, and the instability is accompanied by interface deformations. Neutral stability bounds due to the capillary cut-off are presented in parametric spaces for the electric field strength and the Debye length of the electrolyte.

악취센서로서 전자코의 최근 개발현황

주상우,박상진 한국냄새환경학회 2006 실내환경 및 냄새 학회지 Vol.5 No.3

This review presents the recent developments in electronic noses (E-noses). E-noses based on metal oxide semiconductors, conducting polymers, quartz crystal microbalance and electrochemical methods have been examined with regard to several aspects, from the basic principles to the application of new products, as olfactometry sensors. E-noses consist of an array of chemical sensors, and are currently employed in the analysis of odorous compounds as well as for common gas detection. Various data analyses have been employed to establish patterns of recognition and classification techniques. Future trends and areas of application for e-noses have also been introduced and are summarized within the text. 최근 전자코시스템의 개발현황에 대해서 정리하였다. 금속 산화물 반도체, 전도성 고분자, 수정미세저울 및 전기화학법의 기초원리부터 새로운 상품에 대해서 알아봤다. 전자코시스템의 어레이 시스템에 대해서 알아보고 악취물질 분석에 사용되는 방법에 대해서 조사했다. 패턴인식과 분류방법을 통해서 데이터 분석을 하는 방법에 대해서도 정리했다. 전자코 시스템의 앞으로 전망과 응용분야에 대해서도 요약했다.

국내 아파트의 미세먼지 유입 특성

주상우,지준호,Joo, SangWoo,Ji, JunHo 한국입자에어로졸학회 2019 Particle and Aerosol Research Vol.15 No.4

Infiltration characteristics of airborne particulate matter had been investigated in real-life for about 90 days over 2 years in a Korean apartment building where a 3-person household had lived and the exclusive private area was 84.9 ㎡. Airtightness was measured by fan depressurization, and the ACH₅₀ was 2.41 times per hour. In and outdoor particle concentrations were measured by optical particle counters. Infiltration factors and filtration efficiencies of the house, which reflect the removal of outdoor particles penetrating building envelope and the deposition inside a building, were obtained from data screened based on an empirical evaluation process. Infiltration factor of fine particles showed a range from about 42% at 0.4 m/s of wind speed to 72% at 4.2 m/s of wind speed with closed windows and doors. Filtration efficiency was like a MERV 13 grade filter with an open window outside at a balcony at low outdoor wind speed under 1 m/s. The grade decreased to MERV 11 by opening another outside window at the other balcony. Filtration efficiencies decreased as much as 29% in average at a range of 0.3~2.5 ㎛.

Infrared Spectrum of the Methyl Cation CH3+ in the 7 m region

주상우,T. Oka 한국천문학회 2008 天文學會報 Vol.33 No.2

Wave Motions in Stratified Fluids by a Translating Plate

주상우,박민수 대한기계학회 2006 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.20 No.6

적외선 다이오드 레이저 흡수 분광법을 이용한 미량기체물질 측정

주상우,조근창,이영식,신권수 한국냄새환경학회 2004 실내환경 및 냄새 학회지 Vol.3 No.2

실험실에서 미량의 기체를 파장가변 다이오드 레이저 흡수 분광법 (TDLAS) 을 사용하여 연구하였다. 디지탈 오실로스코프에서 직접적으로 흡광도를 측정하거나 위상 탐지기를 사용하여 시료 기체 셀에 들어 있는 약 10 ppm 정도의 메탄 기체를 주파수 변조에 의하여 이차미분조건에서 탐지하였다. Germanium 에탈론에서 나오는 간섭무늬를 이용하여 스펙트럼선들 사이의 간격을 측정할 수 있었고 HITRAN: 데이터베이스를 이용하여 메탄의 스펙트럼선들의 정확한 위치를 0.001 cm-1 분해능으로 assignment 할 수 있었다. 스펙트럼선들의 신호 대 잡음 비와 현재 실험조건을 미루어볼 때 오실로스코프의 직접 흡수에서는 약 0.01 ppm 정도의 농도를 위상탐지기로는 ppb 수준이하도 탐지가 가능할 것을 확인할 수 있었다. 앞으로 대기 중에 악취물질 탐지에 TDLAS 방법을 적용할 예정이다. We have performed a trace gas measurement in the laboratory using tunable diode laser absorption spectroscopy (TDLAS). A direct absorbance measurement from a digital oscilloscope and a second derivative spectrum using a lock-in amplifier were used to monitor the methane spectral lines in the sample gas cell at the pressure of about 10 ppm. Germanium etalon interference fringes were used to measure the spacing between the spectral lines with a resolution of 0.001 cm-1. HITRAN (high-resolution infrared transmission molecular absorption database) was used to locate the spectral line position of methane. We could successfully monitor the methane gas lines from both the oscilloscope and the lock-in amplifier. A detection limit of about 0.01 ppm from the direct absorption on the oscilloscope and sub-ppb levels via the lock-in detection appeared to be achieved using our diode laser spectrometer. We plan to apply the TDLAS method to monitor various odor active gases in the atmosphere.