FMI Compliant Approach to Investigate the Impact of Communication to Islanded Microgrid Secondary Control

In multi-master islanded microgrids, the inverter controllers need to share the signals and to coordinate, in either centralized or distributed way, in order to operate properly and to assure a good functionality of the grid. The central controller is used in centralized strategy. In distributed control, Multi-agent system (MAS) is considered to be a suitable solution for coordination of such system. However the latency and disturbance of the network may disturb the communication from central controller to local controllers or among agents or and negatively influence the grid operation. As a consequence, communication aspects need to be properly addressed during the control design and assessment. In this paper, we propose a holistic approach with co-simulation using Functional Mockup Interface (FMI) standard to validate the microgrid control system taking into account the communication network. A use-case of islanded microgrid frequency secondary control with MAS under consensus algorithm is implemented to demonstrate the impact of communication and to illustrate the proposed holistic approach.Comment: Proceedings of the IEEE PES ISGT Asia 2017 conferenc

Pathways for the Development of Future Intelligent Distribution Grids

The next decade will bring several technical and organisational challenges to the electrical distribution grids, which are becoming an important pillar of the energy transition. Distribution system operators will play a crucial role and thus need to find innovative solutions that will prepare them for these changes. Allowing the variations in the size, organisation and technical characteristics of distribution grids, this paper presents the pathways for the distribution system operators developed within the scope of the UNITED-GRID project. These were developed in close cooperation with distribution grids and demonstration sites in the Netherlands, France and Sweden. Investment decision tools based on future scenarios and future-readiness assessment form the first step to steer the distribution system operators towards the necessary technical and digital innovations that increase the observability and controllability of the grid. Secondly, the guidelines present new types of business models that can be integrated into the operators’ portfolios. Thirdly, a workshop methodology is proposed to define the new internal requirements that make distribution system operators more agile to face the fast impacts of the energy transition. Case studies from the demonstration sites are used as examples in the paper

On the distribution of the number of internal equilibria in random evolutionary games

In this paper, we study the distribution of the number of internal equilibria of a multi-player two-strategy random evolutionary game. Using techniques from the random polynomial theory, we obtain a closed formula for the probability that the game has a certain number of internal equilibria. In addition, by employing Descartes' rule of signs and combinatorial methods, we provide useful estimates for this probability. Finally, we also compare our analytical results with those obtained from samplings.Comment: 31 pages, comments are welcome. arXiv admin note: substantial text overlap with arXiv:1708.0167

Establishing an Assessment Criteria System for Architectural Heritage of Colonial Educational Buildings in Hanoi

A number of educational buildings were built up by the French in Hanoi during their dominance. Most of these buildings still exist in the downtown area and have become an integral part of the valuable heritage, and their preservation is increasingly imperative. To preserve and promote more efficiently the values of the colonial building heritage assets, there is a need of a set of criteria for an assessment and classification. This paper presents the development of an assessment criteria system for the architectural heritage of colonial educational buildings in Hanoi. According to the proposals, colonial educational buildings can be classified into three groups of Special Value, Notable Value, Average Value. A set of criteria including factors related to both the internal and external values of these buildings have been proposed and validated with expert judgements. Each criterion then is incorporated with a set of scores showing the value it can bring to a colonial educational building to be assessed. The set of criteria and their scores can be used by the city authority to establish regulations to preserve and promote heritage values of the colonial educational buildings in Hanoi

CAMELLIA HOABINHENSIS (THEACEAE: SECT. CHRYSANTHA), A NEW YELLOW-FLOWERED SPECIES FROM NORTHERN VIETNAM

A new species, Camellia hoabinhensis (section Chrysantha, Theaceae), is described and illustrated based on specimens collected from a lowland forest on limestone hills in Hoa Binh Province, northern Vietnam. The species is characterized by its small habit to 4.5 m tall, large flowers 9.0–9.5 cm in diameter with 18–19 light yellow petals, and hairy filaments, ovaries, and styles. A comparison of the new species with similar species, C. euphlebia, C. impressinervis, C. phanii, and C. velutina, is provided. The IUCN conservation status of the proposed species is Data Deficient (DD)

CDIO-based teaching at universities: A case study for students majoring in electrical and electronic engineering technology, Vietnam

In the 1980s of the twentieth century, universities in developed countries began to realize the growing gap between the capabilities of new graduate engineers and the actual requirements of engineering branches. The strong progress of technology requires engineers to have the intellectual abilities and necessary job-specific skills to master that progress. This paper focuses on Conceive, Design, Implement and Operate (CDIO) approach-based teaching for students majoring in electrical and electronic engineering technology at engineering universities in Vietnam to demonstrate the feasibility of the teaching model. The experimental method of synthesizing qualitative and quantitative results for 90 students in control and experimental classes was used. The experimental and control classes both had 45 students. SPSS software version 22 was used to gather data and evaluate the learning results of the two experimental and control groups. According to the findings of the T-test analysis of the independent variables for the two groups, the experimental class performed better in academics and had students in the experimental group who were more satisfied with their post-test scores. This result contributes to confirm that the use of the CDIO-based teaching model in Vietnam is effective for students majoring in electrical and electronic engineering technology

Genomic serotyping, clinical manifestations, and antimicrobial resistance of non-typhoidal Salmonella gastroenteritis in hospitalized children in Ho Chi Minh City, Vietnam

Nontyphoidal Salmonella (NTS) are among the most common etiological agents of diarrheal diseases worldwide and have become the most commonly detected bacterial pathogen in children hospitalized with diarrhea in Vietnam. Aiming to better understand the epidemiology, serovar distribution, antimicrobial resistance (AMR), and clinical manifestation of NTS gastroenteritis in Vietnam, we conducted a clinical genomics investigation of NTS isolated from diarrheal children admitted to one of three tertiary hospitals in Ho Chi Minh City. Between May 2014 and April 2016, 3,166 children hospitalized with dysentery were recruited into the study; 478 (∼15%) children were found to be infected with NTS by stool culture. Molecular serotyping of the 450 generated genomes identified a diverse collection of serogroups (B, C1, C2 to C3, D1, E1, G, I, K, N, O, and Q); however, Salmonella enterica serovar Typhimurium was the most predominant serovar, accounting for 41.8% (188/450) of NTS isolates. We observed a high prevalence of AMR to first-line treatments recommended by WHO, and more than half (53.8%; 242/450) of NTS isolates were multidrug resistant (MDR; resistant to ≥3 antimicrobial classes). AMR gene detection positively correlated with phenotypic AMR testing, and resistance to empirical antimicrobials was associated with a significantly longer hospitalization (0.91 days; P = 0.04). Our work shows that genome sequencing is a powerful epidemiological tool to characterize the serovar diversity and AMR profiles in NTS. We propose a revaluation of empirical antimicrobials for dysenteric diarrhea and endorse the use of whole-genome sequencing for sustained surveillance of NTS internationally

ỨNG DỤNG TƢ LIỆU ẢNH VIỄN THÁM VÀ CÔNG NGHỆ GIS THÀNH LẬP BẢN ĐỒ NGUY CƠ CHÁY RỪNG TỈNH ĐẮK LẮK

Forest fire is one of the disasters causing threats to the forests and the ecosystem and socio-economic aspects throught out the world. Forest fire also leads to an increase in green house gases emisstions. Air pollution due to smoke causes prolonged effects on human health such as respiratory and cardiovascular problems. Knowledge of flammable materials and their potential fire behavior in different forest types is essential in forest fire management. Remote Sensing and GIS can play an important role in detecting burnt forest and developing the spatial models to predict potential forest for fire risk. This study demonstrates the effective use of remote sensing imagery and geographic information system for establishing the forest fire hazard map at scale of 1:100.000 for Daklak province. Landsat ETM image captured in 2011 and Weighted Overlay tool in ArcGIS software were used in this study. Eight parameters of forest types, daily average temperature during  dry  season, daily average precipitation in dry season, daily average  wind  speed,  slope, terrain direction, distant  between  burned  field to forest  and  distant from  resident to forest  were  used  as main inputs in  GIS model. The study result shown that, the total fire area at low fire risk is 219,344 ha (accounting for 35.9% of total area of forest in Daklak province), medium fire risk is 130,207 ha (21.3%), high fire risk is 220,565 ha (36.1%) and very high fire risk is 41,488 ha (6.8%).ReferencesAmparo, A.B., Oscar, F.R., 2003. An intelligent system for forest fire risk prediction and fire fighting management in Galicia. Expert Systems with Applications 25(6), 545-554. Chuvieco, E., Congalton, R.G., 1989. Application of remote sensing and geographic information systems to forest fire hazard mapping. Remote Sensing of the Environment 29, 147-159. Dong, X.U., 2005. Forest fire risk zone mapping from satellite images and GIS for Baihe Forestry Bureau, Jilin, China. Journal of Forestry Research 16(3), 169-174. Gholamreza, J.G., Bahram, G., Osman, M.D., 2012. Forest fire risk zone mapping form Geographic Information System in Northern Forests of Iran (Case study, Golestan province). International Journal of Agriculture and Crop Science 4(12), 818-824. Phạm Ngọc Hưng, 2001. Thiên tai khô hạn cháy rừng và giải pháp phòng cháy chữa cháy rừng ở Việt Nam. Nxb. Nông nghiệp, Hà Nội, 224tr. Phạm Ngọc Hưng, 2004. Quản lý lửa rừng ở Việt Nam. Nxb. Nghệ An, 231tr. Jaiswal, R.K., Mukherjee, S., Raju, D.K., Saxena, R., 2002. Forest fire risk zone mapping from satellite imagery and GIS. International Journal of Applied Earth Observation and Geoinformation 4, 1-10. Lazaros, S.I, Anastaios, K.P., Panagiotis, D.L., 2002. A computer-system that classifies the prefectures of Greece in forest fire risk zones using fuzzy sets [J]. Forest Policy and Economics 4, 43-54. Mariel, A., Marielle, J., 1996. Wildland fire risk mapping using a geographic information system and including satellite data: Example of "Les Maures" forest, south east of France [J]. EARSeL Advances in Remote Sensing 4(4), 49-56. Shailesh Nayak, Sisi Zlatanova, 2008. Remote sensing and GIS technologies for monitoring and prediction of disasters. Springer-Verlag Environment Science and Engineering, 127pp. William, A.T., Ilan, V., Hans, S., 2000. Using forest fire hazard modeling in multiple use forest management planning [J]. Forest Ecology and Management 134(2), 163-176. Bộ Nông nghiệp và Phát triển nông thôn, 2004. Cẩm nang ngành lâm nghiệp - Chương "Phòng cháy và chữa cháy rừng". Chương trình hỗ trợ ngành lâm nghiệp và đối tác, 89tr. Chi cục Kiểm lâm Đắk Lắk, 2012. Báo cáo chuyên đề "Thực trạng cháy rừng, nguyên nhân và các giải pháp phòng cháy chữa cháy rừng". Tài liệu lưu trữ tại Viện Địa lý, 27tr. Forest fire is one of the disasters causing threats to the forests and the ecosystem and socio-economic aspects throught out the world. Forest fire also leads to an increase in green house gases emisstions. Air pollution due to smoke causes prolonged effects on human health such as respiratory and cardiovascular problems. Knowledge of flammable materials and their potential fire behavior in different forest types is essential in forest fire management. Remote Sensing and GIS can play an important role in detecting burnt forest and developing the spatial models to predict potential forest for fire risk. This study demonstrates the effective use of remote sensing imagery and geographic information system for establishing the forest fire hazard map at scale of 1:100.000 for Daklak province. Landsat ETM image captured in 2011 and Weighted Overlay tool in ArcGIS software were used in this study. Eight parameters of forest types, daily average temperature  during  dry  season,  daily  average  precipitation  in  dry  season,  daily  average  wind  speed,  slope,  terrain direction,  distant  between  burned  field  to forest  and  distant from  resident to forest  were  used  as main  inputs in  GIS model. The study result shown that, the total fire area at low fire risk is 219,344 ha (accounting for 35.9% of total area of forest in Daklak province), medium fire risk is 130,207 ha (21.3%), high fire risk is 220,565 ha (36.1%) and very high fire risk is 41,488 ha (6.8%)

Unexpected cases in field diagnosis of African swine fever virus in Vietnam: The needs consideration when performing molecular diagnostic tests

Background: The first confirmed case of African swine fever (ASF) in Vietnam was reported officially in February 2019. To date, ASF virus (ASFV) have been detected in 63/63 provinces in Vietnam. Currently, real-time polymerase chain reaction (PCR) is considered to be a powerful tool for viral detection in field samples, including ASFV. However, some recent reports have suggested that mismatches in primer and probe binding regions may directly affect real-time PCR qualification, leading a false-negative result.Aim: This study aims to further examine a conflicting result obtained from two OIE recommended methods, conventional PCR and real-time PCR, for ASFV detection.Methods: Two ASF suspected pigs from different provinces in the north of Vietnam were selected for this study based on clinical signs and postmortem lesions. The different results obtained by OIE-recommended conventional PCR and real-time PCR were further analyzed by the Sanger sequencing method and virus isolation in combination with hemadsorption (HAD) test using porcine alveolar macrophages cells.Results: The results showed that when the primer sequence matched perfectly with the sequences of field isolates, a mutation in probe binding region was found, indicating that a single mismatch in the probe binding site may cause a false-negative result by real-time PCR in detecting ASFV in clinical samples in Vietnam. An agreement between conventional PCR, using PPA1/PPA2 primers and two golden standard methods, virus isolation in combination with HAD assay, and sequencing method was observed in this study.Conclusion: A single mismatch in the probe binding site caused a failse-negative result by realtime PCR method in field diagnosis of ASFV. The needs consideration when selecting the appropriate molecular diagnostic methods is based on the current databases of ASFV sequences,  particularly for epidemiological surveillance of ASF. Keywords: African swine fever, PCR, Pigs, Real-time PCR, Vietna