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원통형 압전신장기를 이용한 광섬유 음향센서의 신호안정화
이두희,조문재,서상준,은희준,Lee, D.-H.,Jho, M.-J.,Suh, S.-J.,Eun, H.-J 한국음향학회 1989 韓國音響學會誌 Vol.8 No.1
단일모드 광섬유를 이용하여 호모다인 검출방식으로 동작하는 Mach-Zehner 광섬유 간섭계를 구성하여 공기중 음압반응을 조사하였다. 광섬유 간섭계 센서가 직각조건에서 동작하도록 하기 위해 기준 광섬유에 원통형 압전신장기를 사용하는 신호안정화 장치를 제작하였다. 이는 온도변화나 주위환경의 영향에 관계없이 광섬유 간섭계 센서의 감도를 최대의 크기로 일정하게 유지시켜 준다. A Mach-Zehnder interferometer using single mode optical fiber was constructed which operates in homodyne detection scheme. Its response to air-borne soun pressure was examined experimentally. A signal stabilizer was developed for maintaining optical fiber interferometer in quadrature condition using a cylindrical piezoelectric stretcher. This maintains the optical fiber sensor at a maximum sensitivity in the presence of the phase drift caused by temperature fluctuation and other types of environmental disturbances.
스마트 그리드 에너지 저장시스템 슈퍼커패시터의 MWCNT/Super P 함량에 따른 전기 화학적 특성
이두희,이경민,윤중락,Lee, Du-Hee,Lee, Kyoung-Min,Yoon, Jung-Rag 한국전기전자재료학회 2010 전기전자재료학회논문지 Vol.23 No.11
This paper in concerned with the electrochemical properties for supercapacitor of composition with variation of super P/MWCNTs(multi-walled carbon nanotubes) contents. Electrochemical properties of the super P/MWCNTs were measured by cyclic voltammetry at the scan rates of 0.5 mV/s is $TEABF_4$(tetra-ethyl-ammonium-tetra-fluoro-borate) as electrolytes. As a result, the composition for 6 wt% content of MWCNTs led to an increase of capacitance, but DC resistance were decreased. It was found that the content and dispersion appearance of MWCNTs was attributed to the increase in capacitance and lower DC resistance.
분자량 크기별 토양 휴믹산(HA)의 구조적 특성 및 페난트렌 흡착 반응특성 비교
이두희,김소희,신현상,Lee, Doo-Hee,Kim, So-Hui,Shin, Hyun-Sang 한국지하수토양환경학회 2015 지하수토양환경 Vol.20 No.7
A sample of soil humic acid (HA) was divided by ultrafiltration (UF) into five fractions of different molecular size (UF<sub>1</sub>: > 300, UF<sub>2</sub>: 100~300, UF<sub>3</sub>: 30~100, UF<sub>4</sub>: 10~30, UF<sub>5</sub>: 1~10 kilodaltons). Apparent average molecular weight (M<sub>w</sub>) of the HA fractions were measured using high performance size exclusion chromatography (HPSEC), and the chemical and structural properties of the five HA fractions were characterized by elemental compositions (H/C, O/C and w ((2O + 3NH)/ C)) and ultraviolet-visible absorption ratios (SUVA, A<sub>4/6</sub>). The organic carbon normalized-sorption coefficients (Koc) for the binding of phenanthrene to the HA fractions were determined by fluorescence quenching and relationship between the sorption coefficients and structural characteristics of the HA fractions were investigated. The elemental analysis and UV-vis spectral data indicated that the HA fractions with higher molecular weights have grater aliphatic character and lower contents of oxygen, while the HA fractions with lower molecular size have greater aromatic character and molecular polarity that correspond to greater SUVA and internal oxidation values (w). The log Koc values (L/kg C) were gradual increased from 4.45 for UF<sub>5</sub> to 4.87 for UF1. The correlation study between the structural descriptors of the HA fractions and log Koc values of phenanthrene show that the magnitude of Koc values positively correlated with $M_w$ and H/C, while negatively correlated with the independent descriptors of the O/C, w, SUVA and A<sub>4/6</sub>.
이두희,오순호,서창호,김준배,Lee, Doo-Hee,Oh, Soon-Ho,Suh, Chang-Ho,Kim, Joon-Bae 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.5
Objective: In many TMD cases, deformed and reduced condyle heads were frequently observed. This study was prepared to compare the dimensions between normal and symptomatic condyles, using MR images. Materials: One hundred and twenty one patients with clinical signs and MRI-confirmed diagnosis of disc displacement were selected for this study. Thirty eight TMJs from nineteen asymptomatic volunteers who had no clinical symptoms and no disc displacement on sagittal and coronal view of MRI, were served as normal. Methods: Symptomatic condyles were classified according to the severity of the anterior disc displacement. The amount of anterior disc displacement was evaluated at sagittal section, and they were classified into 4 groups as normal(N), little(G0), mild(G1), moderate(G2) and severe displacement(G3). The dimentions of condyle were measured at the 200% magnified view, by digitizing program. All dimensions were compared among each groups on the central section of sagittal and coronal views, and the statistical analysis was performed. Results: The mean value of anteroposterior length of normal condyle was $0.79{\pm}0.13cm$ at sagittal section and mediolateral length was $2.12{\pm}0.22cm$ on coronal section. The mean value of anteroposterior length of symptomatic condyle was $0.67{\pm}0.16cm$ at sagittal section and mediolateral length was $1.97{\pm}0.28cm$ on coronal section. Conclusions: The size of symptomatic condyle was smaller than normal TMJ. The size of condyle was decreased as the amount of the disc displacement was increased. The dimensional change was found on the anterior articular surface of condyle at the mild or moderate disc displacement. And at the case of severe disc displacement, dimensional change was found on the superior articular surface.
이두희,오순호,서창호,김준배,Lee, Doo-Hee,Oh, Soon-Ho,Suh, Chang-Ho,Kim, Joon-Bae 대한구강악안면외과학회 2001 대한구강악안면외과학회지 Vol.27 No.5
Objective: This study was prepared to figure out a certain dimension and morphology of the condyle at the central, medial and lateral aspects on MR images of asymptomatic volunteers, which could be comparable with those of the TMD patients' condyle. Materials: Sixty TMJs from 30 asymptomatic volunteers(15 male, 15 female) who had no clinical symptoms and no disc displacement on sagital and coronal view of MRI were served as normal. Method: MR images were taken from the asymptomatic volunteers and the dimension of the anteroposterior length, mediolateral width, height, convexities were measured through the images on the sagittal and coronal sections of mandibular condyle. Then, these data were collected and analyzed. Result: The mean value of anteroposterior length was $8.00{\pm}1.21mm$ at central section and mediolateral length was $21.40{\pm}2.32mm$ on coronal view. The anterior condylar length at medial side was the shortest and the convexity of anterior slop at the lateral side was proved to be the flattest among 3 sections. There were little dimensional and morphological differences at sagittal sections, but the mediolateral width of condyle at coronal section was significantly different between male and female. Conclusion: In sagittal sections, the anterior condyle length was shortest at medial side and the convexity of anterior slop was flattest at lateral side, and there were little dimensional and morphologic differences between male and female. In coronal section, male's condyle was more wider and flatter than female's.
건설기업의 전략지원을 위한 BPM 우선적용 프로세스 선정에 관한 연구
이두희,송영웅,임형철,박태근,최윤기,Lee, Doo-Hee,Song, Young-Woong,Lim, Hyung-Cheol,Park, Tae-Keun,Choi, Yoon-Ki 한국건설관리학회 2010 한국건설관리학회 논문집 Vol.11 No.1
건설 산업은 다양한 프로젝트를 수행하는 수주중심의 산업적 특성상 정형화된 프로세스로 구축하여 운영하는 것이 매우 어렵다. 이에 건설기업의 동적인 업무 변화 특성 수용과 업무개선을 동시에 만족시킬 수 있는 BPM(Business Process Management)의 도입이 대형 건설업체를 중심으로 이루어지고 있는 상황이다. BPM의 특성과 기업의 고유 전략이 상이하기 때문에 일괄적인 적용은 어렵다. 이에 건설 산업의 특성과 프로세스를 이해하고 기업이 추구하는 비전과 목표에 부합하는 업무 프로세스를 우선 선정하여 적용하는 것이 필요하다. 본 연구에서는 기존 연구 고찰을 통하여 BPM 우선 적용 대상 프로세스 선정방안의 필요성을 제시하고, 건설기업 업무 프로세스 분석을 통해서 건설기업의 BPA를 구축하였다. 국내 건설기업의 전략목표 우선순위 파악을 통하여 높은 우선순위를 가지는 것으로 도출된 수익성과 성장성의 관점에서 핵심 업무 프로세스를 도출하였다. 또한 BPM 적용대상 프로세스 평가 기준을 6가지로 제시하여 이를 바탕으로 핵심 업무 프로세스를 평가하여 BPM 우선 적용 대상 프로세스를 도출하였다. Construction companies are fulfilled in according to project, and it is difficult to execute the standardized process in various construction projects. Thus many construction companies is adopting BPM(Business Process Management) that meet business process change and business improvement. However, it is difficult to apply BPM in a lump because of difference of BPM characteristics and company's strategies. For this reason, it is desirable to select business process based on company's priority. This study indicated need of method for selecting business process through studying current researches, and made BPA for construction company by analyzing business process in construction company. Moreover, this study indicated core business process from a point of profitability and growth view through grasping strategic goal priority. And also, it proposed criteria for process evaluation for BPM adoption, evaluated core business process, and indicated prior business process for BPM adoption.
고상추출법과 액액추출법을 이용한 수질 시료 중 Hexabromocyclododecanes (HBCDs) 분석법 연구
이두희 ( Hye Ri Lee ),정인영 ( In-young Chung ),이혜리 ( Hye Ri Lee ),김혁 ( Hyuk Kim ),박상아 ( Sang-ah Park ),김일규 ( Il-gyu Kim ),도영선 ( Young-sun Do ),이원석 ( Won Seok Lee ),최종우 ( Jong Woo Choi ) 한국환경분석학회 2016 환경분석과 독성보건 Vol.19 No.2
In this study, we evaluated analytical methods for the determination of three hexabromocyclododecane diastereomers (α, β, γ-HBCD) using solid-phase extraction (SPE) and liquid-liquid extraction (LLE). Instrumental analysis was conducted using high-performance liquid chromatography with a triple-quadrupole mass spectrometer (LC/MS/MS), and the hydrophilic-lipophilic balance (HLB) cartridge was used for SPE. SPE showed the highest recovery when using ethyl acetate as the eluent, and 40% methanol was used as the clean-up solvent. In LLE, a multilayer column using AgNO3 showed a low recovery rate. The respective method detection limits (MDLs) and the limits of quantitation (LOQs) of HBCDs in water were 0.068-0.145 ng/L and 0.217-0.462 ng/L for SPE, and 0.043-0.293 ng/L and 0.135-0.932 ng/L for LLE. The accuracy ranged from 96.3% to 104.3% for SPE and 99.3% to 101.2% for LLE. The precision values for both SPE and LLE were less than 5.98%.
이두희 ( Doo Hee Lee ),조영준 ( Young Jun Cho ),송정식 ( Jung Sik Song ),서창희 ( Chang Hee Seo ),이지수 ( Ji Soo Lee ),이수곤 ( Soo Kon Lee ) 대한류마티스학회 1999 대한류마티스학회지 Vol.6 No.1
Amyopathic dermatomyositis is defined by characteristic cutaneous manifestation of dermatomyositis without evidence of muscle involvement. There is no clinical difference between dermatomyositis and amyopathic dermatomyositis. Pulmonary involvement of dermatomyositis is so frequent than aggressive dianostic and therapeutic approach is needed. Early steroid or immunosuppresive treatment in pulmonary involvement of dermatomyositis gets better prognosis. Intravenous immunoglobulin treatment is an effective and safe alternative when the steroid or immunosuppresive treatment is ineffective or intolerable. We are reporting a case of amyopathic dermatomyositis with interstitial lung disease. This patient was improved with intravenous immunoglobulin treatment.
흡입챔버 내 Didecyldimethyl Ammonium Chloride 및 Ethylene Glycol 혼합물질 분석법 연구
이두희 ( Doo Hee Lee ),이진선 ( Jin Seon Lee ),권정택 ( Jung Taek Kwon ),권도영 ( Do Young Kwon ),김은지 ( Eun Ji Kim ),박상아 ( Sang Ah Park ),이혜리 ( Hye Ri Lee ),김현미 ( Hyun Mi Kim ),이원석 ( Won Seok Lee ) 한국환경분석학회 2015 환경분석과 독성보건 Vol.18 No.2
This study evaluated analytical methods for the mixture of ethylene glycol (EG) and didecyldimethyl ammonium chloride (DDAC), which are used as the main components of deodorants and biocides. EG and DDAC were nebulized in aerosol into inhalation chambers. For absorbents of EG and DDAC, XAD-7 OVS resin and glass fiber (GF) filters were used, respectively. Instrumental analysis was conducted with gas chromatography/ flame ionization detector (GC/FID) for EG and high performance liquid chromatography with triple-quadrupole mass spectrometer (LC/MS/MS) for DDAC. The method detection limit (MDL) and the limit of quantitation (LOQ) were 24 μg/m3 and 77 μg/m3 for EG, and 13 ng/m3 and 41 ng/m3 for DDAC. The recovery rates ranged from 100.7% to 105.5% for EG, and 97.4% to 98.9% for DDAC. The relative standard deviation (RSD) of EG and DDAC ranged less than 5.72%. Daily monitoring was also conducted at the concentration of 0.2% for 7 days. The results showed that the mean values ranged from 0.728 mg/m3 to 0.739 mg/m3 and the overall accuracy was 11.9% to 16.2%.