• 한국통신학회논문지
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• 제34권7B호
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• pp.668-676
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• 2009

IETF(Internet Engineering Task Force)에서 IP망에서 이동성 지원을 위해 Mobile 1Pv6(M1Pv6)를 시작으로 Hierarchical MlPv6(HMIPv6) 등을 제안하였지만, 이러한 클라이언트 기반 이동성 지원 연구들은 이동성 지원 메시지 전송을 위한 무선자원 낭비와 긴 핸드오버 지연 등을 야기함으로 인해 주목을 받지 못하고 있다. 본 논문에서는 기존 클라이언트 기반 이동성 지원 기술의 문제점 해결을 위해 Router-based Binding Update(RBU) 방법을 제안한다. RBU 방법은 기존 HMIPv6에서 단말기에 추가 구현없이 Neighbor Discovery 프로토콜을 통해 라우터가 Mobility Anchor Point(MAP)에 위치등록을 한다. 이와 같은 방법을 통하여 RBU 방법은 부분적인 네트워크 기반 이동성을 지원하며 HMIPv6에 비해 핸드오버 시간을 줄일 수 있도록 설계 되었다. 제안방안의 성능검증을 위해 기존 HMlPv6와 비교 분석하였다. 그 결과 RBU 방법이 HMlPv6에 비해 매크로 도메인 핸드오버에 대해 지연시간이 최대 약 15% 줄어들며 특히 무선링크 지연이 큰 경우 좋은 성능을 보인다.

• KIEAE Journal
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• 제13권5호
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• pp.111-118
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• 2013

This study aims to investigate advantages of complex installation of green roof and PV system in a public building, to analyze the impact of green roof on the efficiency of PV power generation, and to consider the correlation between green roof and PV power generation. When the temperature and power generation of the modules installed in the green roof and non-green roof of the public building were measured for 3 days, the average temperature of the green roof was 23.6 degrees, and it was 36.1 degrees in the non-green roof which increased by nearly 53%. Overall, the module temperature in the green roof was lower. On the other hand, in relation to the PV generation depending on temperature reduction during the same period, the mono-crystalline module and the poly-crystalline module in the green roof showed an increase in generation at nearly 222.2W and 341.6W, and the efficiency rose by 5.5% and 6.2%, respectively, compared to the modules in the non-green roof. Therefore, it is analyzed that green roof has a positive influence on PV power generation. Finally shows the efficiency of the installed on the Green Roof PV system (complex Installation) higher than on the concrete roof PV system. Thus, the complex PV systems as well as the usual benefits of green roofs will provide greater synergies.

• 한국전기전자재료학회논문지
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• 제29권12호
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• pp.847-852
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• 2016

Using both EVA and POE encapsulants, we fabricated polycrystalline Si PV modules and performed a set of reliability tests of PID, DH, TC, and Complex prior to outdoor installation. The power output with temperatures and insolation as well as I-V characteristics had been monitored under outdoor environments for 18 months. In the entire period, the total power of 3,576 kWh from POE PV modules was observed larger than 3,449 kWh from EVA PV modules by 3.5%. All the PV modules showed a 5.6~9.2% drop in the conversion efficiency. As for the solar power generation, the PV modules performed through PID, TC test revealed distinct difference in between EVA and POE for which the POE PV module produced more power by +11.4% and +6.6%, respectively, as measured in the 18th month. In addition, POE was proved to protect better the solar cells under PID influence.

• 전력전자학회논문지
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• 제21권6호
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• pp.481-485
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• 2016

When analyzing economic feasibility for installing a PV generation plant at a certain location, the prediction of possible annual power production at the site using the target PV panels should be conducted on the basis of the local weather data provided by a local weather forecasting office. In addition, the prediction of PV generating power under certain weather conditions is useful for fault diagnosis and performance evaluation of PV generation plants during actual operation. This study analyzes PV cell characteristics according to a variety of weather conditions, including ambient temperature and irradiance level. From the analysis and simulation results, this work establishes a proper model that can predict the output characteristics of PV cells under changes in weather conditions.

• Journal of Electrical Engineering and Technology
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• 제6권6호
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• pp.731-741
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• 2011

Conventional methodologies (empirical, analytical, numerical, hybrid, etc.) for sizing photovoltaic (PV) systems cannot be used when the relevant meteorological data are not available. To overcome this situation, modern methods based on artificial intelligence techniques have been developed for sizing the PV systems. In the present study, the optimum PV/inverter sizing ratio for grid-connected PV systems with orientation due south and inclination angles of $45^{\circ}$ and $60^{\circ}$ in selected Algerian locations was determined in terms of total system output using type-2 fuzzy logic. Because measured data for the locations chosen were not available, a year of synthetic hourly meteorological data for each location generated by the PVSYST software was used in the simulation.

• International Journal of Internet, Broadcasting and Communication
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• 제7권2호
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• pp.90-95
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• 2015

This paper describes IEC 61727 standard of Photovoltaic (PV) systems -Characteristics of the utility interface. IEC 61727 standard tests include utility compatibility and personnel safety and equipment protection of PV inverter performance functions. Especially utility compatibility part includes test items of 1) voltage, current and frequency, 2) normal voltage operating range, 3) flicker, 4) DC injection, 5) normal frequency operating range, 6) harmonics and 7) waveform distortion, 8) power factor of PV inverter. Also personnel safety and equipment protection part includes test items 1)loss of utility voltage, 2)over/under voltage and frequency, 3)Islanding protection, 4)response to utility recovery, 5)earthing, 6)short circuit protection, 7)Isolation and switching of PV inverter. In this paper, each item of IEC 61727 standard test is studied and analyzed and finally full tested by PV inverter performance function.

• 전력전자학회논문지
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• 제25권6호
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• pp.433-441
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• 2020

This study proposes a constant power tracking algorithm to compensate for the intermittent characteristics of Photovoltaic connected to a DC micro grid. A PV-ESS integrated module in which distributed ESS is additionally connected is utilized for the proposed algorithm. PV performs P&O MPPT control at all times. To supplement the intermittent characteristics of PV, the proposed constant power tracking algorithm maintains constant power by operating the distributed ESS of the PV-ESS integrated module in accordance with the output state of the PV. By performing PSIM simulation and an experiment, this study verifies the performance of the integrated module of PV-ESS for DC micro grids applying the constant power tracking algorithm.

• 한국공간구조학회논문집
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• 제8권6호
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• pp.85-94
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• 2008

본 논문은 국내 외 PV 통합 프로젝트를 구조 디자인의 시각에서 평가한 논문이다. 국내 외 대표사례를 공공시설과 전시시설로 구분하여 국내 사례 3가지, 해외사례 3가지의 대표 사례를 들었다. 평가항목은 건축물과의 자연스러운 통합, 엔지니어링디테일, 혁신적인 새로운 설계의 항목으로 평가하고 그 결과를 비교 분석하였다. 국내의 공공시설 및 전시시설은 주로 옥상층에 독립지지방식을 사용한 사례가 많았으며 아직 디자인적 통합부분에서는 미흡함을 알 수 있었다. 하지만 전시시설은 건축물 설계단계에서부터 PV 패널을 염두에 둔 사례들이 증가하고 있었다. 그에 비해 해외 공공시설 및 전시시설의 경우는 주로 모듈 접합방식을 사용하면서 구조적인 통합과 디자인적 통합을 동시에 이루었으며 사용하는 PV패널의 종류도 좀 더 다양함을 알 수 있었다.

• 전기학회논문지
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• 제59권6호
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• pp.1046-1052
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• 2010

In residential house, photovoltaic (PV) system among various alternatives in renewable energy system is the most efficient and feasible solution for reducing energy consumption and electricity cost. However, relatively high initial cost make people reluctant to install PV system in their houses. Therefore, in the initial state for PV system installation in the house, it is very important to decide proper capacity of the PV system considering the expected energy usage and solar energy supplying condition with the house. This paper proposes a novel optimization model for deciding appropriate capacity of the PV system for residential house. The objective function of the model is to minimize the annual cost including electricity bill, operation and maintenance cost, and annual fixed cost calculated from the initial installation cost based on capital recovery factor (CRF). The model also shows the optimal inclining angle of PV panels of the system. In this paper, we estimate the PV output using PVWATTS (PV simulator of Office of Energy Efficiency and Renewable Energy) and find optimal solutions by Sequential Quadratic Programming (SQP) method using MATLAB software. The proposed approach is finally applied to a residential model house in Gangneung, Gangwon-Do and verified its feasibility for adopting to PV system design for residential houses.

• Bulletin of the Korean Chemical Society
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• 제23권9호
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• pp.1235-1267
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• 2002

A series of 2,5-dialkoxy substituted poly(1,4-phenylenevinylene) derivatives containing a rigid and bulky cyclohexyl group in the side chain, poly[2-(7-cyclohexylheptyloxy)-5-butoxy-1,4-phenylenevinylene] (PBCyHpPV), Poly[2-(6-cyclohexylmethoxyhexyloxy)-5-butoxy-1,4-phenylenevinylene] (PBCyHxPV), Poly[2,5-di-(6-cyclohexylmethoxy-hexyloxy)-1,4-phenylenevinylene] (PDCyHxPV) were synthesized via the Gilch polymerization. The synthesized polymers were soluble in common organic solvents and showed good thermal stability up to $370^{\circ}C$. The maximum absorption of PBCyHpPV, PBCyHxPV and PDCyHxPV as thin films was at 513 ㎚, 515 ㎚, 511 ㎚, respectively. Photoluminescence maximum emission of above polymers appeared at 590 ㎚, 597 ㎚, 590 ㎚, respectively. The electroluminescence (EL) maxima of the polymers appeared around 585-590 ㎚, and also showed another shoulder around 630 ㎚ strongly. PDCyHxPV showed the highest EL efficiency and EL power than those of other polymers due to the dilution effect of the two rigid and bulky cyclohexyl groups.