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병원성 박테리아 검출용 헤테로다인 복조 기반 광섬유 바이오 센서
이슬이(Seul-Lee Lee),고영종(Youngjong Ko),김장현(Jang Hyun Kim),강현욱(Hyun Wook Kang),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.11
In this paper, we demonstrated an optical fiber biosensor based on heterodyne demodulation to detect five pathogenic bacteria species forming biofilms, such as Escherichia Coli, Vibrio Vulnificus, Pseudomonas Aeruginosa, Staphylococcus Aureus, and Streptococcus Iniae, with their fluorescence characteristics. The proposed sensor detects the fluorescence of the five bacteria species with the intrinsic fluorescence characteristics of amino acid tryptophan, whose excitation and emission wavelengths are 280 and 350 nm, respectively. The fabricated sensor consists of an UV light source for excitation of bacteria, a high sensitivity detector for detection of fluorescence signals emitted from the excited bacteria, and a lock-in amplifier for amplification of the detected fluorescence signals. The lock-in amplifier can remove various noise signals coupled with the desired fluorescence signals and amplify the magnitude of the desired signal through the heterodyne demodulation technique. This signal processing technique enables the detection of the weak picowatt (pW) fluorescence signals. Consequently, it is concluded that our sensor can successfully detect the intensity of the fluorescence signal emitted from five pathogenic bacteria species whose concentration lies within 10² to 10<SUP>7</SUP> CFU/ml.
직교 입력 편광에 따른 위상 천이 장주기 격자의 pH 및 온도 응답에 관한 연구
이슬이(Seul-Lee Lee),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2021 조명·전기설비학회논문지 Vol.35 No.3
In this paper, we demonstrated an optical fiber sensor based on a phase-shifted long-period fiber gratin g (PS-LPFG) that could realize simultaneous measurement of surrounding pH and temperature variations. The PS-LPFG composed of a grating-free fiber region (GFFR) in the middle of two identical LPFGs was fabricated on high-birefringence fiber (HBF) with CO₂ laser pulses. In addition, a π phase shift formed by setting the length of the GFFR as half of the grating period of an LPFG allows a transmission dip to split into two attenuation bands at two different resonance wavelengths. Since HBF can preserve a linear state of polarization (SOP) if the input SOP is aligned with one of its two principal axes (fast or slow axis), a PS-LPFG inscribed on HBF (HB-PS-LPFG) can create two different transmission spectra for two orthogonal input SOPs, i.e., linear horizontal polarization (LHP) and linear vertical polarization (LVP). To investigate pH and temperature responses of the fabricated HB-PS-LPFG, the dip wavelength separation bet ween two different attenuation bands was used as a sensor indicator for an LHP or LVP input SOP. Consequently, pH- and temperature-induced wavelength variations of the two sensor indicators showed linear and independent spectral responses to both pH and temperature variations in a pH range from 3 to 11 and a temperature range from 25 to 65 °C. With these unique pH or temperature responses of the two sensor indicators, the fabricated sensor could realize simultaneous measurement of pH and temperature.
편광상이 고리 기반 광섬유 다파장 필터의 입력 편광으로 제어되는 채널 간격 스위칭에 대한 연구
이슬이(Seul-Lee Lee),이용욱(Yong Wook Lee) 한국조명·전기설비학회 2020 조명·전기설비학회논문지 Vol.34 No.2
In this paper, we propose an optical fiber multiwavelength filter based on a polarization-diversified loop (PDL), whose channel spacings (CSs) can be controlled by its input state of polarization (SOP). The PDL-based filter consists of a polarization beam splitter, three half-wave plates (HWPs), a Faraday rotator (FR), and two polarization-maintaining fiber (PMF) segments with equal birefringence and different lengths. At proper orientation angle sets (θ<SUB>h1</SUB>, θ<SUB>h2</SUB>, θ<SUB>h3</SUB>) of the three HWPs, the proposed filter can have its polarization-dependent transmittance, offering the CS-switchable operation realized by switching between two orthogonal input SOPs of linear horizontal polarization (LHP) and linear vertical polarization (LVP). In particular, at a fixed input SOP, a half-period wavelength switching operation, i.e., an interleaving operation, can also be implemented by controlling only one HWP angle (θ<SUB>h1</SUB> or θ<SUB>h3</SUB>). Theoretical prediction was verified by experiments. For orthogonal input SOPs of LHP and LVP, the fabricated PDL-based filter could provide transmission spectra with CSs of ∼0.9 and ∼0.3nm or vice versa at appropriate sets of (θ<SUB>h1</SUB><SUB></SUB>, θ<SUB>h2</SUB>, θ<SUB>h3</SUB>), respectively, and each of the transmission spectra could be interleaved by adjusting only θ<SUB>h1</SUB> or θ<SUB>h3</SUB>.
이슬비(Seul Bee Lee),이예원(Ye Won Lee),이호연(Ho Yeon Lee),임효현(Hyo Hyun Lym),김준형(Jun Hyung Kim),김민선(Min Sun Kim) 한국산학기술학회 2015 한국산학기술학회 학술대회 Vol.2015 No.1
문화와 관광이 각광받고 있는 지금, 그 소비의 주체인 관광소비자의 행동과 이들의 행동을 이끌 국가와 기업에서 실시하고 있는 다양한 마케팅 방법 중 문화관광 마케팅이 관광소비자의 행동에 미치는 영향을 사례를 통해 분석하였다. 이를 통해 각 관광소비자의 행동을 분석하는 것과 통합적인 데이터베이스를 구축하여 보다 거시적인 시각에서 고객행동을 분석하여 세분화된 시장으로 접근해야 함을 조언한다.
이슬아(Seul Ah Lee),이순행(Soon-Hang Lee),방희정(Hee-Jung Bang) 한국아동학회 2017 아동학회지 Vol.38 No.6
Objective: This study was conducted to investigate the relationship between early mental development and preschool intelligence. Methods: A total of 51 children were administered with the Cognitive scale and Language scale of the Korean version of the Bayley Scales of Infant and Toddler Development-3rd Edition (K-Bayley-III); after one year, K-WPPSI was used to measure preschool intelligence. Results: First, the K-Bayley-III Cognitive and Language scales showed a significant correlation with Performance, Verbal, and Full-Scale IQ (PIQ, VIQ, and FSIQ) in the K-WPPSI. Second, the strongest predictive variable for VIQ was language development, followed by cognitive development in the K-Bayley-III . In addition, the predictive variable that had the strongest influence on PIQ was the K-Bayley-III cognitive development index. Finally, the Cognitive and Language scales of the K-Bayley-III had an appropriate level of discrimination, and the cut-off composite scores of the K-Bayley-III were also adjusted 2-3 points below 85 for predicting at-risk delay, as defined by the K-WPPSI. Conclusion: This study demonstrated the continuity of cognitive performance across early childhood. The K-Bayley-III , which includes the Cognitive and Language scales from the Mental scale of the Bayley Scales of Infant Development II (BSID-II ), is a useful and valid test for predicting intelligence in early childhood.
한국어 연결어미 "-다가"의 교육 내용 연구-상적 의미 및 용언 결합 제약을 중심으로-
이슬비 ( Seul Bi Lee ) 이중언어학회 2014 이중언어학 Vol.56 No.-
This study aims to describe Korean connectives ‘-daga’ considering its aspectual meaning and verb constraint. Through searching ‘-daga’ in Korean modern novel corpus, we concluded that ‘-daga’s core meaning is ‘event transition’ and by its aspectual meaning, it has a verb constraint that only combines with verbs which event maintains some duration of time. Furthermore it founded somewhat preference of verbs that combines ‘-at/etdaga’ or ‘-daga’ by its event construction. To teach ‘-daga’, we suggest that focusing the core meaning, ‘transition of events’ and presenting that the transition occurs from continuous event or state to other event or state. Also, ‘-daga’s further meaning, ‘transition to an accidental result’ can be taught with a relation to this core meaning. For the verb constraint, we can present it implicitly by controlling input like example sentences.(Seoul National University)
이슬비(Lee Seul Bee),이예원(Lee Ye Won),이호연(Lee Ho Yeon),한은비(Han Eun Bee),김민선(Min Sun Kim) 한국산학기술학회 2014 한국산학기술학회 학술대회 Vol.- No.-
기업이 실시하고 있는 다양한 마케팅 방법 중의 효과적으로 알려진 로열티 프로그램에 대 한 정의와 실시된 배경과 그 과정 그리고 현재까지의 발전된 모습을 통해 소비자에게는 실 용적이고 쾌락적인 혜택을 준다는 것이 확인되었으며, 기업에게는 포화된 시장에서의 고객 과의 관계를 유지시키며 이 관계에서 더 나아가 새로운 고객을 확보하는데 영향을 주고 있 음을 알았다. 그러나 모방이 되기 쉽고 단기적인 영향을 끼치며 높아지는 소비자의 기대를 충족시키기에 문제가 있다는 점에서 장기적인 관점과 더불어 세분화된 시장에 전략적으로 접근하는 노력이 필요하며, 각 분야의 협력을 통해 구체적인 방안을 마련해야함을 조언한다.