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I-V Characteristics According to Irradiation for Photovoltaic Systems
이영(Ying Lee),최용성(Yong-Sung Choi),You-Sai Zhang,이경섭(Kyung-Sup Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
Solar, as an ideal renewable energy, it has inexhaustible, clean and safe characteristics. However, solar energy is an extreme intermittent and inconstant energy source. In order to improve the photovoltaic system efficiency and utilize the solar energy more fully, and the DC current varies with the irradiation, it is necessary to study the characteristics of photovoltaic I-V according to the external factors. This paper presents the analysis of characteristics of photovoltaic I-V according to the irradiation.
중국 내몽고 지역 도시와 농촌 중학생의 영양지식 및 식습관 차이 연구
이영(Ying Li),이영미(Youngmi Lee),박나리(Nari Park),박혜련(Haeryun Park) 동아시아식생활학회 2015 동아시아식생활학회지 Vol.25 No.6
This study investigated differences in nutritional knowledge and eating habits of adolescents living in rural and urban areas of Inner Mongolia, China. A survey was conducted on 869 middle school students in Hohhot, Inner Mongolia: 436 from urban and 433 from rural school. Subjects answered a questionnaire about socio-economic characteristics such as parents’ education level and family affluence scale, nutritional knowledge, needs for nutritional education and food habits. Levels of parents’ education (p<0.001) and family affluence (p<0.001) were significantly higher in urban students. Nutritional knowledge level of urban students was higher than that of their counterparts (p<0.001). However, rural students reported higher needs for nutritional education (p<0.001). Rural students more frequently consumed snacks (p<0.001) and instant noodles (p<0.001) than urban students. However, consumption frequencies of lunch (p<0.001), dinner (p<0.001), fast food (p<0.001), fruits (p<0.001), vegetables (p<0.001), and milk (p<0.001) were higher in urban students. Considering differences in eating patterns between urban and rural students in Inner Mongolia, appropriate nutritional education programs and nutritional policies should be established for rural students to promote a healthy diet.
Proof of Faraday' the 1st Law in a Combined System of Solar Cell and Fuel Cell
이영(Ying Li),최용성(Yong-Sung Choi),장우새(You-Sai Zhang),이경섭(Kyung-Sup Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.10
Nowadays, the photovoltaic energy is suitable for many applications and used widely in many areas. Furthermore, as ideal new energy, the fuel cell only needs low maintenance and low operating cost. In this paper, the solar cell generates the power to the electrolyser to electrolyse the distilled water into hydrogen and oxygen. According to the relationship between the mass of hydrogen and oxygen released and the quantity of electricity, the Faraday's first law is verified in the combined system of the solar cell and fuel cell.
이영(Ying Li),최용성(Young-Sung Choi),張尤賽(You-Sai Zhang),이경섭(Kyung-Sup Lee) 대한전기학회 2010 전기학회논문지 P Vol.59 No.1
The solar cells and fuel cells power are being encouraged to reduce the environmental pollution and combat the global warming. And the electric generation hybrid system is usually more reliable and less costly than the systems that use a single source of energy. HOMER provides a platform to design and simulate the power system and then to choose the optimization results. Based on the electricity demand conditions during a year, this paper simulates with the HOMER and performs the monthly average electrical production and the most feasible economical case includes the net present costs and the annualized costs of the hybrid system components.
Pre-Feasibility Study of Stand-Alone Hybrid Energy System for Applications in a Lab
Ying Li(이영),Young-Sung Choi(최용성),You-Sai Zhang(?尤?),Kyung-Sup Lee(이경섭) 대한전기학회 2009 전기학회논문지 P Vol.58 No.4
As renewable and sustainable energy, solar energy and wind energy have advantages in reducing the pollution sources. The paper presents a hybrid system which includes the solar cell and the wind generator. HOMER provides a platform to design and simulate the power system and then to choose the optimization results. This paper simulates with the HOMER and performs a pre-feasibility study of stand-alone hybrid energy systems for applications in a lab.
플라시도원반 방식의 비디오각막경을 이용한 각막곡률 및 난시측정과 기존의 각막곡률계와의 비교
김영휘(Yung Hui Kim),이영(Ying Li),이효석(Hyo Seok Lee),윤경철(Kyung Chul Yoon) 대한안과학회 2016 대한안과학회지 Vol.57 No.12
목적: 플라시도 원반 방식의 비디오각막경을 이용한 각막곡률 및 난시측정의 임상적 유용성을 평가하고 기존의 각막곡률을 측정할 수 있는 기기들과의 차이가 있는지 알아보고자 하였다. 대상과 방법: 2015년 11월부터 2016년 1월까지 백내장 수술이 예정된 45명 45안을 전향적으로 조사하였다. 플라시도 원반 방식의 비디오각막경(Keratograph?? 5M), 자동각막곡률계(KR-8900??), 수동각막곡률계(B&L Manual Ophthalmic Keratometer??), 플라시도 원반-세극등주사 각막곡률계(ORBscan II??), 샤임플러그 각막곡률계(Pentacam??) 및 저간섭성 반사계(Lenstar??)를 이용하여 각막곡률 및 난시를 기기당 1안에 3회씩 반복 측정하였다. 기기별 반복성 및 신뢰성 비교는 변동계수, 표준편차 및 군내연관계수를 통해 분석하였고 기기 간 측정치 평균 차이 비교는 반복측정 분산분석을 통해, 일치도 평가는 Bland-Altman plot으로 분석하였다. 결과: 평균각막곡률 및 각막난시의 측정에 있어 Keratograph?? 5M과 다른 기기 간의 차이는 없었으며, J0, J45에서도 통계적으로 유의한 차이는 보이지 않았다(p>0.05). Bland-Altman plot으로 분석한 Keratograph?? 5M과 다른 기기 간 일치도에서 95% limits of agreement (LoA) 값이 각막곡률은 -0.78~0.55D로, J0은 -0.72~0.88D로, J45는 -0.39~0.47D로 나타났다. 결론: 각막곡률 및 난시의 측정에 있어 Keratograph?? 5M은 기존의 각막곡률계와 비교하여 서로 비슷한 재현성을 나타냈으며 다른 기기들과 상호보완적으로 이용될 수 있다. Purpose: In the present study, the repeatability and reproducibility of the corneal power and astigmatism measurements using placido-based video keratography were evaluated and the agreement with other keratometers were compared. Methods: This prospective study included 45 patients (45 eyes) scheduled to undergo cataract surgery between November 2015 and January 2016. Three sets of corneal power and astigmatism were measured using placido-based video keratometer (Keratograph?? 5M), automatic keratometer (KR-8900??), manual keratometer (B&L manual keratometer??), Placido-scanning-slit keratometer (ORBscan II??), Scheimpflug keratometer (Pentacam??), and low coherence interferometry (Lenstar LS900??). Reliability of each device was analyzed using the coefficient of variation, standard deviation and intraclass correlation coefficient. Repeated measures analysis of variance was used to analyze the interdevice comparison of mean absolute difference. The agreement between the devices was evaluated with 95% limits of agreement (LoA) and Bland-Altman plots. Results: The mean corneal power, astigmatism and power vector analysis (J0, J45) were not significantly different among devices (p > 0.05). In the Bland-Altman plot analysis, the 95% LoA of corneal power, J0, and J45 when comparing Keratograph?? 5M with others ranged from -0.78 to 0.55 D, from -0.42 to 0.45 D, and from -0.39 to 0.47 D, respectively. Conclusions: Keratograph?? 5M showed good repeatability and reproducibility of corneal power and astigmatism measurements and was interchangeable with other keratometers.
질화법으로 제작한 강자성 터널링 접합의 국소전도 및 자기저항 특성
윤대식,박범찬,이영우,이영,김종오,Yoon Tae Sick,Tsunoda Masakiyo,Takahashi Migaku,Park Bum Chan,Lee Young-Woo,Li Ying,Kim Chong Oh 한국재료학회 2004 한국재료학회지 Vol.14 No.3
Tunnel junctions with AI-N barriers fabricated by microwave-excited plasma were studied. When the Al thickness, nitridation time, and annealing temperature were 1 nm (0.8 nm), 50 s (35 s), and $280^{\circ}C$ ($300^{\circ}C$), TMR ratio and resistance-area product (RA) were 49% (34%) and $3 ${\times}$ 10^4$ $\Omega$$\mu\m^2$ ($1.5 ${\times}$ 10^4$ $\Omega$$\mu\m^2$), respectively. In order to clarify the annealing temperature dependence of TMR ratio, the local transport properties were measured for Ta 5 nm/Cu 20 nm/Ta 5 nm$29_{76}$ $Fe_{24}$ 2 nm/Cu 5 nm/M $n_{75}$$Ir_{25}$ 10 nm/ $Co_{71}$ $Co_{29}$ 4nm/Al-N junction with Al thickness of 0.8 nm and nitridation time of 35s at various temperatures. The increase of TMR ratio after annealing at $300^{\circ}C$, where the TMR ratio of the corresponding MTJ had the maximum value of 34%, can be well explained by the enhancement of the average barrier height ($\Phi_{ave}$) and the reduction of its fluctuation. After further annealing at $340^{\circ}C$, the leakage current was observed and the TMR ratio decreaseded
최용석,조성수,윤기갑,이완수,이영,김종오,Choi, Y.S.,Cho, S.S.,Yoon, G.G.,Lee, W.S.,Li, Ying,Kim, C.O. 한국재료학회 2001 한국재료학회지 Vol.11 No.8
비정질 $Tb_{45.7}$ $Fe_{54.3-x}$ /$Co_{x}$ 및 $Tb_{50.2}$ /$_{Fe}$ 49.8-x/$Co_{x}$ (0$\leq$$x\leq$9.6) 합금박막의 자기적 특성 및 자기변형특성에 대하여 체계적으로 조사하였다. 박막제조는 Fe 타게트에 Tb, Co 소편으로 구성된 복합타겟 방식의 rf 마그네트론 스퍼터링법에 의해 제조하였다. XRD 조사에의 한 박막의 미세구조는 잘 발달된 비정질 구조를 나타내었다. $Tb_{45.7}$ $Fe_{54.3-x}$ $Co_{x}$ (x=2~4)에서 우수한 고유자기변형특성 및 저자기장자기변형특성을 얻었다. 즉, 100 Oe의 저자장에서 130ppm의 자기변형을 나타내었으며 고유자기변형 (인가 자기장, 5 kOe)은 330ppm에서 400ppm으로 증가하였다. The magnetic and magnetostrictive properties of amorphous Tb/sub 45.7/Fe/sub 54.3-x/Co/sub x/ and Tb/sub 50.2/Fe/sub 49.8-x/Co/sub x/ (0≤x≤9.6) thin films have systematically been investigated. The films were fabricated by rf magnetron sputtering using a composite target which consists of a Fe plate and Tb, Co chips. The microstructure mainly consists of an amorphous phase. Excellent intrinsic and low magnetic-field-magnetostrictive properties were achieved in Tb/sub 45.7/Fe/sub 54.3-x/Co/sub x/ and Tb/sub 50.2/Fe/sub 49.8-x/Co/sub x/ (0≤x≤9.6). The magnetostriction of 130 ppm was obtained with low field of 100 Oe. The intrinsic magnetostriction(applied field, 5 kOe) were increased from 330ppm to 400ppm.
황준원(Jun-Won Hwang),이영(Ying Lee),최용성(Yong-Sung Choi),이경섭(Kyung-Sup Lee) 대한전기학회 2009 대한전기학회 학술대회 논문집 Vol.2009 No.4
In this thesis, output voltage, current and power of solar module were classified by irradiation and module temperature from data of overall operating characteristics collected for one year in order to manage efficient photovoltaic generation system and deliver maximum power. In addition, from these data, correlations between irradiation, module temperature of photovoltaic cell and amount of power given by photovoltaic cell was quantitatively examined to deduce optimization of the design and construction of photovoltaic generation system. The results of this thesis can be summarized as follows. As I-V characteristics according to a temperature range of 10~50[], the area of I-V characteristics were increased with an increase in temperature. Since this area corresponds to the power, output power is thought to have increased with temperature.