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Rosyadi, Marwan,Takahashi, Rion,Muyeen, S.M.,Tamura, Junji Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
This paper present stabilization control of fixed speed wind generator by using variable speed permanent magnet wind generator in a wind farm connected with multi-machine power system. A novel direct-current based d-q vector control technique of back to back converter integrated with Fuzzy Logic Controller for optimal control configuration is proposed, in which both active and reactive powers delivered to a power grid system are controlled effectively. Simulation analyses have been performed using PSCAD/EMTDC. Simulation results show that the proposed control scheme is very effective to enhance the voltage stability of the wind farm during fault condition.
Ahmad Adib Rosyadi,Ock Taeck Lim(임옥택) 한국자동차공학회 2024 한국자동차공학회 부문종합 학술대회 Vol.2024 No.6
This paper presents a numerical study on the characteristic of combustion using mixed fuel (Diesel-Propane) in a compression ignition (CI) engine with EGR. Propane is often used as an alternative fuel in motor vehicles, especially in countries that want to reduce exhaust emissions. However, the addition of propane to the Internal Combustion Engine (ICE) causes the combustion temperature to increase. Increased temperature in the combustion chamber can trigger Nitrogen to react and cause NOx emissions. From the last experimental study on impact of EGR in a Compression Ignition Engine can reduce combustion temperature because inert gas such as Nitrogen (N2) from emissions can be used as inhibitors in the combustion process. This method is carried out with the aim of reducing oxygen in the atmosphere to inhibit the rate of the combustion reaction thereby reducing combustion temperature. There are few studies on the combustion characteristics of Diesel-Propane fuel with EGR. Diesel Fuel (90%) - Propane (10%), Diesel Fuel (80%) - Propane (20%), Diesel Fuel (70%) - Propane (30%), and pure Diesel Fuel with EGR and without EGR were used as fuel in this study. To ensure numerical results we are comparing them with experimental studies. Combustion characteristics including diesel fuel and propane blend were investigated and got the highest pressure in combustion chamber on the D9P1 without using EGR of 86.5419 bar in the combustion chamber. Adding propane can increase the pressure in the combustion chamber during combustion, but adding too much propane can reduce the performance of the IC engine. The usage of EGR during combustion process produces smaller pressure in combustion chamber than combustion without EGR.
Mitigation of Load Frequency Fluctuation Using a Centralized Pitch Angle Control of Wind Turbines
Junqiao, Liu,Rosyadi, Marwan,Takahashi, Rion,Tamura, Junji,Fukushima, Tomoyuki,Sakahara, Atsushi,Shinya, Koji,Yosioka, Kazuki Journal of International Conference on Electrical 2013 Journal of international Conference on Electrical Vol.2 No.1
In this paper an application of centralized pitch angle controller for fixed speed wind turbines based wind farm to mitigate load frequency fluctuation is presented. Reference signal for the pitch angle of each wind turbine is calculated by using proposed centralized control system based on wind speed information. The wind farm in the model system is connected to a multi machine power system which is composed of 4 synchronous generators and a load. Simulation analyses have been carried out to investigate the performance of the controller using real wind speed data. It is concluded that the load frequency of the system can be controlled smoothly.
Theory and Experiment for Wireless-Powered Sensor Networks: How to Keep Sensors Alive
Choi, Kae Won,Rosyady, Phisca Aditya,Ginting, Lorenz,Aziz, Arif Abdul,Setiawan, Dedi,Kim, Dong In IEEE 2018 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.17 No.1
<P>In this paper, we investigate a multi-node multi-antenna wireless-powered sensor network (WPSN) comprised of one power beacon and multiple sensor nodes. We have implemented a real-life multi-node multi-antenna WPSN testbed that operates in real time. We propose a beam-splitting beamforming technique that enables a power beacon to split microwave energy beams toward multiple nodes for simultaneous charging. We experimentally demonstrate that the beam-splitting beamforming technique achieves the Pareto optimality. For perpetual operation of the sensor nodes, we adapt an energy neutral control algorithm that keeps a sensor node alive by balancing the harvested and consumed power. The joint beam-splitting and energy neutral control algorithm is designed by means of the Lyapunov optimization technique. In our experiments, the proposed algorithm has successfully kept all sensor nodes alive by optimally splitting energy beams toward multiple sensor nodes.</P>
Wireless-Powered Sensor Networks: How to Realize
Choi, Kae Won,Ginting, Lorenz,Rosyady, Phisca Aditya,Aziz, Arif Abdul,Kim, Dong In INSTITUTE OF ELECTRICAL AND ELECTRONICS ENGINEERS 2017 IEEE Transactions on Wireless Communications Vol. No.
<P>In this paper, we study a multi-antenna wireless-powered sensor network (WPSN), in which a power beacon wirelessly transfers electric energy to a sensor node via an electromagnetic wave. We have implemented a real-life multi-antenna WPSN testbed and conducted extensive experiments on the testbed. The key technology for the high-efficiency WPSN is an adaptive energy beamforming scheme that dynamically steers a microwave beam towards a sensor node. We propose a receive power-based channel estimation and energy beamforming algorithm. In addition, an adaptive duty cycle control algorithm is proposed to prevent energy storage of a sensor node from being depleted. The proposed duty cycle control algorithm is designed based on a proportional-integral-derivative controller. These algorithms are all implemented in the multi-antenna WPSN testbed. By experiments, we validate the feasibility of the multi-antenna WPSN, and show the performance of the proposed algorithms.</P>
Kumar Vikranth,Kim Sung Hoon,ADNAN MOCH ROSYADI,허정,정진희,Priatama Ryza A.,이증주,김철민,제병일,박순주,Xuan Yuan Hu,한창덕 한국식물학회 2021 Journal of Plant Biology Vol.64 No.5
Tillering is one of the most important determinants of biomass and yield in rice (Oryza sativa L.). The capacity of plants to develop tillers from primordial meristems or buds is determined not only by the genotype but also by environmental cues. Here, we characterized the function of rice grassy tiller1 (OsGT1) and its interaction with other genetic and biological factors involved in tiller bud outgrowth in rice by generating OsGT1 RNA interference (RNAi) and overexpression (OX) lines. The tiller number was increased in OsGT1-RNAi mutants but strongly suppressed in OsGT1-OX lines. Expression analysis of OsGT1 in rice phyB mutants and in genotypes carrying various genetic combinations of GT1 RNAi and phyB demonstrated that OsGT1 is not involved in phyB-mediated suppression of tiller development in rice. Expression analysis of fine culm1 (fc1), a rice tb1 homolog, and molecular assays demonstrated that FC1 enhances the expression of OsGT1 by directly binding to its promoter. Comparison of the transcriptomic profiles of fc1 and OsGT1-RNAi mutants revealed differentially expressed genes (DEGs) common to both genotypes. Finally, analysis of tillering phenotypes of OX and RNAi seedlings treated with various phytohormones implied a possible role of OsGT1 in strigolactone-mediated tiller outgrowth. Overall, this study enhances our understanding of the diverse mechanisms of tiller development in grasses.
Vikranth Kumar,Sung Hoon Kim,Ryza A. Priatama,Jin Hee Jeong,Moch Rosyadi Adnan,Bernet Agung Saputra,Chul Min Kim,Byoung Il Je,Soon Ju Park,Ki-Hong Jung,Kyung Min Kim,Yuan Hu Xuan,Chang‑deok Han 한국식물학회 2020 Journal of Plant Biology Vol.63 No.5
The AMT1 family comprises major ammonium transporters in rice roots. In this study, we utilized AMT1 RNAi mutants (amt1) to explore how AMT1 affects NH4+- and NO3–-mediated morphological development and NH4+-responsive gene expression in roots. In the presence of NH4+, amt1 showed inhibition of NO3–- dependent lateral root development. The inhibitory action of NH4+ on lateral root growth was independent of the NO3– concentrations supplied to amt1 roots. The results of split root assays indicated that NH4+ exerts systemic action in inhibiting NO3–-dependent lateral root development in amt1. Further study with NAA and NOA, a potent auxin flux inhibitor, suggested that perturbation of membrane dynamics might not be the primary cause of the inhibitory action of NH4+ on NO3–-mediated lateral root growth in amt1 mutants. RNA-seq analysis of NH4+-responsive genes showed that approximately half of DEGs observed in wild-type roots were not detected in the DEGs of amt1 roots. Gene ontology enrichment analysis suggested that the expression of specific functional gene groups were affected by amt1 during the early response to NH4+. Auxin-responsive gene expression and root gravity responses were altered in amt1. This study demonstrated that AMT1 affects the interactions not only between ammonium and nitrate in lateral root growth but also between auxin and NH4+ in rice roots.