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Electromagnetic actuator design for the control of light structures
Johan Der Hagopian,Jarir Mahfoud 국제구조공학회 2010 Smart Structures and Systems, An International Jou Vol.6 No.1
An ElectroMagnetic Actuator (EMA) is designed and assessed numerically and experimentally. The EMA has the advantage to be without contact with the structure so it could be applied to light and small mechanism. Nevertheless, the open-loop instability and the nonlinear dynamic behavior with respect to the excitation frequency could limit its application field. The EMA is designed and dimensioned as a function of the experimental structure to be controlled. An inverse model of the EMA is proposed in order to implement a linear action block for the used frequency range. The control strategy is a fuzzy controller with displacements and velocities as inputs. A fuzzy controller of Takagi-Sugeno type is used. The air gap is estimated by using a modal approximation of the displacements issued from all measurements. Several configurations of control are assessed by using numerical simulations. The block diagram used for numerical simulations is implemented under Dspace?environment. The implemented controller was tested experimentally in the context of impact perturbations. The results obtained show the effectiveness of the developed procedures and the robustness of the implemented control.
Peace in the Global Era and Perspectives of the Unification on the Korean Peninsula
Johan Galtung 동아대학교 동아시아연구원 2009 동아시아 : 비교와 전망 Vol.8 No.2
Peace studies divide into two parts, negative and positive. Both apply to the Korean peninsula. It is possible to work on both at the same time, and great progress has been made. Looking forward, much remains to be done. Positive peace presupposes negative peace; if the underlying conflict is not reasonably well solved positive peace will be a house built on sand. The word "unification" often used for positive peace, is problematic, and may itself stand in the way of unification. Unification of the Korean nation through open borders and free flow of persons, ideas, goods and services between the two Koreas is unproblematic, but unification of the two states into one is highly problematic. One state less? In that case which one, and how? Through military conquest like North Korea tried 1950-53? Or, as they also did, waiting for its collapse as a capitalist autocracy? Or, as some do in South Korea today, waiting an hoping for North Korea to collapse, like East Germany, calculating the costs without knowing the serious negative effects in Germany? Whether through conquest or collapse, this approach to unification is not peaceful. And peace has to be obtained by peaceful means.
Factors associated with side effects of COVID-19 vaccine in Indonesia
Johan Wibowo,Rivaldo Steven Heriyanto,Felix Wijovi,Devina Adella Halim,Claudia Claudia,Elizabeth Marcella,Billy Susanto,Michele Indrawan,Nadia Khoirunnisa Heryadi,Michelle Imanuelly,Jonathan Juniard A 대한백신학회 2022 Clinical and Experimental Vaccine Research Vol.11 No.1
Purpose: As coronavirus disease 2019 (COVID-19) continues to spread rapidly causing approximately 186 million confirmed cases around the world, the urgency to reach herd immunity through vaccination is increasing. However, vaccine safety is a top priority to limit the occurrence of adverse events. Henceforth, this study aims to recognize and perceive COVID-19 vaccine safety in Indonesia during the pandemic. Materials and Methods: This is a cross-sectional study and was conducted in Indonesia during the COVID-19 pandemic using an online survey of demographic information and a qualitative questionnaire. Responses were recorded and the association between demographic characteristics from survey questions was tested using chi-square with a risk estimate and 95% confidence interval. Results: A total of 311 participants from 33 out of 34 provinces in Indonesia participated in this study. Recorded responses showed multiple side effects of the COVID-19 vaccine both shortand long-term experienced by the participants. Significant associations were found between demographic factors and COVID-19 vaccine side effects such as female gender with shortterm puncture site (odds ratio [OR], 0.463; 95% confidence interval [CI], 0.263–0.816) and shortterm other reactions (OR, 0.463; 95% CI, 0.263–0.816), domicile outside Java island with longterm puncture site (OR, 4.219; 95% CI, 1.401–12.701) and immune reactions (OR, 3.375; 95% CI, 1.356–8.398), also between married marital status and long-term vagal reaction (OR, 4.655; 95% CI, 1.321–16.409). Conclusion: Gender, domicile and marital status factors were associated with COVID-19 vaccine side effects in Indonesian people.
Satellite and Local Measurements Based Services for Air Quality Improvement
Johan de Vries,Edo Loenen,Bas Mijling,Wencke van der Meulen,Arthur van der Meer 한국대기환경학회 2019 Asian Journal of Atmospheric Environment (AJAE) Vol.13 No.1
AIRBUS presents a global monitoring service on atmospheric composition and emission allocation. Air composition and meteorological data from satellites and local sensors are combined into a chemical transport model to build up or validate trace gas and particulate matter emission sources and their impact on air quality. The service is using the AIRBUS’ developed OMI and TROPOMI satellite sensors to be able to quickly disclose new regions around the globe at low cost, as has been done for eastern Asia and the Indian continent. This yields a database of up-to-date emission sources at a spatial resolution of about 3.5 km (and in the future 1 km) and provides daily observation data on regional and transboundary transport of pollutants. Target constituents are NO2, particulate matter, CH4, (tropospheric) ozone and SO2. The full blown service adds data from several measurement systems (on ground, aircraft, high-altitude solar powered drones or pseudo satelites (HAPS) and nanosatellites) and various data like land-use and traffic information to achieve street level spatial resolution while maintaining accuracy and validation status. The resulting database of emission sources has the same street level spatial resolution and is intended to serve local issues. It has presently been built for several EU cities. This advanced and costcompetitive Air Quality Monitoring service is used for awareness building, policy development and policy evaluation and enforcement. The intent is to realize a commercial global service, based on local cooperation. The paper will describe the service and status.