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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>.
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.
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)
이슬이(Lee, Seul-Yi),신은경(Shin, Eun-Kyung),김세용(Kim, Sei-Yong) 대한건축학회 2014 대한건축학회논문집 Vol.30 No.12
Urban transportation system is usually interactive with land use planning. Therefore, urban characteristics should be taken account to facilitate bicycle use in an urban area. The former way of drawing out traffic density projection was considered to be inadequate since by force of habit, transportation planning and complex development did not impose simultaneously but in a particular sequence. This study aims to establish an activation plan for the Public bicycles use and draw out factors for bicycle station’s selection of location through analyzing space correlation between urban characteristics and the usage of the Public bicycles. The analyzed result in the case of Changwon-si shows that there is a spatial autocorrelation between two factors. Moreover, it also arrived at the conclusion that Spatial Lagged Model and Spatial Error Model has 10% higher relevancy than Ordinary Least Square. The operation of Spatial Lagged Model arranges factors in order of correlation: main facility’s total floor area, public transportation density, traffic accident rate, and population density.
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.
지역단위 질소 부하 및 질소수지 관계 고찰 : 사례중심
이슬비(Seul-Bi Lee),조송래(Song-Rae Cho),이예진(Ye-Jin Lee),이찬욱(Chan-Wook Lee),현병근(Byeong-Geun Hyun),송요성(Yo-Sung Song),김양민(Yang-Min Kim) 한국토양비료학회 2021 한국토양비료학회 학술발표회 초록집 Vol.2021 No.11
2017년 기준 한국 질소수지는 212kg/ha로 OECD 평균 대비 3.1배(질소1위), 인수지는 46kg/ha로 7.7배(인 2위)이다. 잉여 양분은 잠재적인 토양 양분집적, 온실가스 배출, 수질오염원으로 작용하므로 효과적인 양분관리가 시급하다. 이러한 문제해결을 위해 공익직불제, 농업환경 보전프로그램, 지역 양분관리제 시범사업 등 다양한 양분관리 정책을 시행중이다. 하지만 국가 양분수지 개선을 위해 다양한 지역 여건을 반영한 양분수지 개선 모델개발이 필요하다. 이에, 지역 양분부하와 양분수지와의 관계를 분석해 양분관리 취약 분야를 도출하고자 하였다. 3개 시군(B: 농업환경 보전프로그램 도입, G: 축협중심 양분관리제 시범사업(’20, 환경부), S시군(대조구))을 선정해 최신 통계의 양분수지(농경지 면적당 질소투입량과 질소흡수량의 차이), 양분부하(양분투입량/양분필요량(표준비료사용량 기준))를 산정하였고, 농경지 이용형태별 토양화학성을 통해 양분부하 영향을 평가하였다. 단위면적당 질소투입․흡수량은 G시군(투입433kg/ha, 흡수146kg/ha)>B시군(295, 89)>S시군(227, 83)순이며, 질소 필요량은 S시군(125kg/ha)>G시군(113)>B시군(101), 질소수지는 G시군(366kg/ha)>B시군(206)>S시군(141)이었다. 부문별 질소 투입비율은 B시군 무기질>닭오리>돼지>기타>젖소>한육우>유기질, G시군은 무기질>닭오리>돼지>한육우>기타>유기질>젖소, S시군은 무기질>기타>닭오리>유기질>한육우>돼지>젖소이었다. 부문별 질소 흡수비율은 B시군 벼>잔사>채소>두류>서류>특용>과수>맥류>잡곡, G시군 벼>잔사>채소류>특용>과수>두류>잡곡>서류>맥류, S시군 벼>잔사>채소류>두류>특용>서류>과수>맥류>잡곡이었다. 질소부하와 질소수지는 정의 상관관계를 보이며, 도별 평균과 비교했을 때 G시군은 질소부하와 질소수지가 모두 높아 적극적인 양분관리 정책 도입이 시급한 것으로 평가되었다. G시군의 토양 화학성은 시설재배지의 EC와 밭을 제외한 논, 시설재배지, 과수원에서 유효인산이 적정범위보다 초과하였다. G시군의 질소투입량을 줄이기 위해 공익직불제, 경축순환과 연계한 적정 비료 및 가축분 퇴·액비 사용, 조사료 생산 확대를 통한 질소흡수량 증대 등의 중·장기적 정책도입과 정책의 효과 모니터링이 필요할 것으로 판단된다.