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Representation of small passenger ferry maneuvering motions by practical modular model
Wicaksono Ardhana,Hashimoto Naoya,Takahashi Tomoyasu 대한조선학회 2021 International Journal of Naval Architecture and Oc Vol.13 No.1
Maneuvering motions of a ship in calm water are studied through the concept of MMG model. Governing forces are defined by the use of available empirical formulae that require only main ship particulars as input variables. In order to validate the calculation tool, a full-scale sea experiment was carried out in Osaka Bay using a 17-m twin-screw passenger ferry. Test execution and data measurement were performed through the utilization of an autopilot control unit and satellite compass. The result of a straight running test confirms the acceptable accuracy in addressing the surge motion problem. Reasonable agreement between simulation and experiment is also confirmed for 5+=5+ and 10+=10+ zig-zag tests despite the strong environmental disturbance. The current model can generally represent the subject ship maneuvering motions and is promising for the application to other ship hulls.
GPS-Visual SLAM Navigation on Unmanned Aerial Vehicle
Wicaksono Muhammad,Silvirianti,Soo Young Shin 한국통신학회 2021 한국통신학회 학술대회논문집 Vol.2021 No.11
This work proposed for unmanned aerial vehicles (UAV) self-navigation combine the global positioning system (GPS) navigation and simultaneous localization and mapping (SLAM) navigation. This proposed system aims to solves UAV position outdoor environment which denied GPS signal. In this proposed system there are two type trajectories, Global trajectory and Local trajectory. Global trajectory define the route maps from initial location to goal location. This scenario assumed GPS signal in the initial position is available. The local trajectory active the SLAM system while GPS signal is poor and unavailable. In order to validate the system performance, the proposed system is implemented. The experimental result show this system could working in multi thread GPS Navigation and SLAM Navigation.
Water-Energy-Food (WEF) Nexus considering Climate Change
Wicaksono, Albert,Jeong, Gimoon,Bae, Deg Hyo,Kang, Doosun 한국방재학회 2015 한국방재학회 학술발표대회논문집 Vol.14 No.-
Present day, 1.1 billion people face the lack of water; 1.3 billion people cannot access modern energy and 1.02 billion people are still starving. Meanwhile, the number of human population keeps increasing and this will induce the water, energy, and food scarcity in the future even worse. Increasing the stock or finding new alternative resources of water, energy and food individually is the most practical way to avoid the scarcity. Behind this improvement, it must be realized that these resources are connected each other. Water needs energy to be treated and distributed; in opposite way energy production requires water for cooling system or as the sources in hydropower plant. Food is in needed water and energy for growing, producing and delivering. Food can also become new energy source from biofuel but the food intensification will deteriorate water quality. Therefore, the integrated development and management, known as Water-Energy-Food (WEF) Nexus, is needed to reach the balance and optimal development. Fulfilling the human need faces another challenge when the climate change influences the availability of these resources. Many researchers report that climate change causes increase in the earth temperature alters the rainfall pattern and magnitude which affect the safe water availability. Further, it can affect the food and energy production. Taking an inappropriate use of water, energy and food will threaten the amount of resources itself. As it is a complex and complicated interconnection, it is difficult to determine the appropriate uses solely based on human judgment. Many researchers have developed computer models to simulate the correlation between each element and aid the decision maker. Due to its complexity, most of models only focus on one or two elements such as water-energy or water-food and put other element as the secondary parameter. This study provides overview of the WEF Nexus and inter-connections among the three elements. Furthermore, we will envision a development of an evaluation model that can simulate and optimize the use of water, energy and food efficiently under the climate change condition. If succeed, this model could be a decision support system for government or stakeholder to implement a regulation related to efficient use of water, energy and food.
Wicaksono, Psycha Anindya,Sismindari, Sismindari,Martien, Ronny,Ismail, Hilda Asian Pacific Journal of Cancer Prevention 2016 Asian Pacific journal of cancer prevention Vol.17 No.4
Ribosome-inactivating protein (RIP) from Mirabilis jalapa L. leaves has cytotoxic effects on breast cancer cell lines but is less toxic towards normal cells. However, it can easily be degraded after administration so it needs to be formulated into nanoparticles to increase its resistance to enzymatic degradation. The objectives of this study were to develop a protein extract of M. jalapa L. leaves (RIP-MJ) incorporated into nanoparticles conjugated with Anti-EpCAM antibodies, and to determine its cytotoxicity and selectivity in the T47D breast cancer cell line. RIP-MJ was extracted from red-flowered M. jalapa L. leaves. Nanoparticles were formulated based on polyelectrolyte complexation using low viscosity chitosan and alginate, then chemically conjugated with anti-EpCAM antibody using EDAC based on carbodiimide reaction. RIP-MJ nanoparticles were characterised for the particle size, polydispersity index, zeta potential, particle morphology, and entrapment efficiency. The cytotoxicity of RIP-MJ nanoparticles against T47D and Vero cells was then determined with MTT assay. The optimal formula of RIP-MJ nanoparticles was obtained at the concentration of RIP-MJ, low viscosity chitosan and alginate respectively 0.05%, 1%, and 0.4% (m/v). RIP-MJ nanoparticles are hexagonal with high entrapment efficiency of 98.6%, average size of 130.7 nm, polydispersity index of 0.380 and zeta potential +26.33 mV. The $IC_{50}$ values of both anti-EpCAM-conjugated and non-conjugated RIP-MJ nanoparticles for T47D cells (13.3 and $14.9{\mu}g/mL$) were lower than for Vero cells (27.8 and $33.6{\mu}g/mL$). The $IC_{50}$ values of conjugated and non-conjugated RIP-MJ for both cells were much lower than $IC_{50}$ values of non-formulated RIP-MJ (>$500{\mu}g/mL$).
Nationwide simulation of water, energy, and food nexus: Case study in South Korea and Indonesia
Wicaksono, Albert,Kang, Doosun Elsevier 2019 JOURNAL OF HYDRO-ENVIRONMENT RESEARCH Vol.22 No.-
<P><B>Abstract</B></P> <P>Water, energy, and food (WEF) scarcity has been realized as a global issue, and several strategies have been proposed to solve this problem. The WEF Nexus is a novel concept in resources management that integrates and considers feedback connections of water, energy, and food production and consumption in a single framework. The discussion of WEF Nexus commonly involves several parties with different backgrounds and expertise to decide sustainable management plan. This paper introduces a computer simulation model to calculate the supply and consumption, availability, and reliability of water, energy, and food resources on a nationwide scale considering the interconnections of resources. Developed based on a system dynamics algorithm, the Water-Energy-Food Nexus Simulation Model (WEFSiM) simulated the nationwide resources nexus implementing the changes of energy policy in South Korea and capital investment planning of urban water systems in Indonesia. Successfully calculating the reliability index of resources and evaluating the feedback analysis in both case studies, WEFSiM can investigate resource security under plausible future conditions, and stakeholders possibly could utilize it as a decision support tool.</P>
Indoor Visual Odometry and Visual SLAM with Seamless Positioning for UAV Navigation
Muhammad Wicaksono,Soo Young Shin 한국통신학회 2022 한국통신학회 학술대회논문집 Vol.2022 No.2
This work proposed for unmanned aerial vehicles (UAV) indoor positioning combine visual odometry (VO) and visual simultaneous localization and mapping (Visual-SLAM). Positioning system is the one various field of navigation in UAV. This system aims to solve UAV positioning indoor to obtain UAV position data continuously while the environment near of UAV is changed. VO’s system use for tracking camera to generate the local pose of UAV while UAV takeoff. Visual-SLAM use depth camera to generate map and localize the navigation. Rather than visual slam mapping the environment, visual slam recognize the pose position of each keyframe. While UAV has done for take-off using VO, the UAV will switch to visual-slam. In the transition system switch the pose position input, VO integrated to Visual-SLAM pose position to enhance the seamless positioning of UAV. In order to validate the system performance while UAV fight, the proposed system is implemented in real vehicle. The experimental result show this system robust while the environment is changed.