Earticle

The manually adjustable support structural system with the additional variable joints in the lower columns is presented for the slope variation of solar panels. Also, it is important to select the optimal members considering the safety of the support structure according to the various design variables. Therefore, this study presents the optimal module through the structural modelling and analysis of the adjustable support structures with the design variables.

In this paper, we present an economical and practical standard to install a bypass diode in a thin-film PV module. This method helps to reduce heat generation and to prevent module degradation due to excess current from reverse bias. The experimental results confirm that for different numbers of solar cells, there is a relation between the excess reverse current and the degradation of solar cells in a-Si:H modules. The optimal number of solar cells that can be connected per bypass diode could be obtained through an analysis of the results to effectively suppress the degradation and to reduce the heat generated by the module. This technique could be expanded for use in high power crystalline Si PV modules.

자체 제작한 프로그램인 USB security module과 Active Directory를 활용하여 서버에서 다수의 클라이언트를 관리할 수 있는 시스템을 구축한다. USB 보안 모듈과 Active Directory의 보안정책을 결합하여 극단적이고 폐쇄적인 강력한 보안을 가능케 하며 보안정책별 효용성을 살펴보고자 한다.

Recently, the module-integrated converter has shown an interest in the photovoltaic generation system. In this system, the high frequency transformer should be compact and efficient. The proposed method is based on the correlation characteristic between the copper and core loss to minimize the loss of transformer. By sizing an effective cross-sectional area and window area of core, the amount of loss is minimized. This paper presents the design and analysis of high frequency transformer by using the 3D finite element model coupled with DC-DC converter circuit for more accurate analysis by considering the nonlinear voltage and current waveforms in converter circuit. The current waveform in each winding is realized by using the ideal DC voltage source and switching component. And, the thermal analysis is performed to satisfy the electrical and thermal design criteria.

In this paper, we present a reducing power consumption of a scheduling for module selection under the time constraint. A a reducing power consumption of a scheduling for module selection under the time constraint execute scheduling and allocation for considering the switching activity. The focus scheduling of this phase adopt Force-Directed Scheduling for low power to existed Force-Directed Scheduling. and it constructs the module selection RT library by in account consideration the mutual correlation of parameters in which the power and the area and delay. when it is, in this paper we formulate the module selection method as a multi-objective optimization and propose a branch and bound approach to explore the large design space of module selection. Therefore, the optimal module selection method proposed to consider power, area, delay parameter at the same time. The comparison experiment analyzed a point of difference between the existed FDS algorithm and a new FDS_RPC algorithm.

본 논문에서는 일사량 및 표면온도에 따라 변화하는 태양전지의 출력 특성을 고려하여 설치되는 태양광 발전 인버터의 운전 허용 범위에 대해 살펴본다. 또한 대용량 발전 시 직렬 모듈 수를 높이는 구성과 기존 센트럴 인버터의 최소 MPP 전압의 증가에 대한 효율성을 검증하기 위해 (주)카코 뉴에너지에서 제공하는 PV Array Sizing Tool과 Matlab Simulink를 통해 태양전지 어레이의 동작 범위를 파악하고, 새로운 대용량 인버터 개발 원리의 타당성을 제시한다.

The construct of photovoltaic module array, main power source of photovoltaic system, is very important to the efficiency improvement of whole photovoltaic system. Photovoltaic modules are usually connected in series or parallel to meet power capacity required. Since output characteristics of a photovoltaic module are greatly fluctuated on the variation of insolation, temperature and its type, the maximum open circuit voltage and output operating voltage of photovoltaic module array must exist in the admissible input voltage range of inverter system under any operating conditions. In this paper, we present the selection and array method of photovoltaic modules through simulation for the coupling loss reduction between photovoltaic modules and a inverter.

The brake judder comes from non-uniformities in the tire/wheel assembly caused by mechanical effects such as a brake torque variation (BTV). A disc thickness variation (DTV) related with the kinematic behavior of the disc was investigated a main source of BTV. In this study, a dynamic model with brake corner assembly of full vehicle using MSC.ADAMS was correlated by experiment of judder phenomenon. Judder was generated and correlated systematically by judder experiment in chassis and brake dynamometer from variation in the thickness of the disc. Also it has been found a judder transfer path and variation of the braking pressure. Through analysis of transfer function and movement of subsystem caused by BTV generation, design parameters have been found. Based on the results obtained from parameter study of suspension module, the effective design process and developed model with brake corner assembly was suggested for vibration reduction of steering wheel caused by the judder phenomenon.

In this paper, an analytical study to reduce permanent deformation in a cockpit module is presented. The analytical investigation utilizes a novel and practical methodology, which is implemented through the software tools, ABAQUS and iSight, for the identification and minimization of permanent deformation. Here, the emphasis is on evaluating the software for issues relating to the prediction of permanent deformation. The analytical results are compared with the experimental findings for two types of deformation location and the qualitative correlation is found to be very good. In this study, we also develop a methodology to design the guide and mount location of cockpit module for minimizing the permanent deformation. Nonlinear finite element analysis has been implemented and integrated with sensitivity-analysis techniques to minimize the permanent deformation at the areas of interest. Finally, we find the optimal guide and mount locations that reduce the permanent deformation.

This study presents the optimal design and performance evaluation of a heatpipe-based cooling module for improving the cooling performance of a cold-water tank system. Five different cooling module configurations were designed, including a reference module usingonly a heat sink and four modules incorporating heat pipes with different arrangements. Experimental results showed that the R-type heat pipe configuration exhibited the best coolingperformance, reaching the target cold-water temperature of 5°C within approximately 112minutes, which corresponds to a 37.8% improvement compared to the reference module. Theenhanced performance is attributed to the reduced thermal resistance and more effective heattransfer path achieved by the optimized heat pipe arrangement. To further analyze the thermalbehavior, computational fluid dynamics simulations were performed for the optimal configuration. The numerical model considered the heat transfer process from the thermoelectric modulethrough the heat pipe to the heat sink and surrounding air. The predicted cooling time wasapproximately 110 minutes, showing good agreement with the experimental result with a deviationof less than 2 minutes (within 1.8%). In addition, the temperature trends of the TEM and heatsink were well captured, confirming the reliability of the numerical model in predicting the overallheat transfer mechanism. The results demonstrate that the proposed heat pipe-based coolingstructure effectively enhances the thermal management performance of compact cooling systems. Furthermore, the validated numerical approach can be utilized as a reliable tool for designoptimization and performance prediction under various operating conditions.

태양광 모듈은 필요한 발전량을 얻기 위해 태양 전지를 직렬과 병렬로 조합하여 구성하며, 이 모듈은 일사량 및 온도에 따라 발전성능이 크게 좌우되는 특성을 가지고 있다. 또한, 태양광 전원은 건물 또는 나무 등의 주변 환경에 의한 음영과 같은 특수한 상황에 의하여 출력손실이 발생하게 된다. 즉 태양광 전원을 구성하는 태양광 모듈 일부에 부분음영이 발생할 경우, 태양광 모듈의 단락전류가 제한되어 전체 발전량 손실을 초래하고, 열점(Hot-Spot) 현상과 같은 열화현상이 발생하여 모듈의 수명을 단축시킨다. 따라서 본 논문에서는 태양광 모듈의 출력을 향상시키기 위한 태양전지와 바이패스 다이오드의 최적구성 알고리즘을 제시하였다. 또한, 부분 음영에 의한 출력손실을 최소화하기 위하여 태양광 어레이의 회로를 최적으로 구성하는 알고리즘을 제시하였다. 상기 알고리즘을 바탕으로 회로해석 프로그램인 PSIM S/W를 이용하여 태양광 모듈과 태양광 어레이를 모델링하여 시뮬레이션을 수행하였다. 그 결과, 본 논문에서 제안한 태양 전지와 바이패스 다이오드의 최적구성 알고리즘과 태양광 어레이의 최적구성 알고리즘이 태양광 전원의 성능 향상에 유용함을 확인하였다.

Solar cells in a PV module are connected in series and parallel to produce a higher voltage and current. The PV module has performance characteristics depending on solar radiation and temperature. In addition, the PV system causes power loss by special situations, including the shadows of the surrounding environment, such as nearby buildings and trees. In other words, an increase in power loss and a decrease in life cycle can occur because of the partial shadow and hot-spot effect. Therefore, this paper proposes the optimal configuration algorithm of a bypass diode to improve the output of a PV module and one of a PV array to minimize the loss of the PV array. In addition, this paper presents a model of a PV module and PV array based on the PSIM S/W. The simulation results confirmed that the proposed optimal configuration algorithms are useful tools for improving the performance of PV system.