An efficient method to include equality constraints in branch current distribution system state estimation

Distribution system state estimation is a fundamental tool for the management and control functions envisaged for future distribution grids. The design of accurate and efficient algorithms is essential to provide estimates compliant with the needed accuracy requirements and to allow the real-time operation of the different applications. To achieve such requirements, peculiarities of the distribution systems have to be duly taken into account. Branch current-based estimators are an efficient solution for performing state estimation in radial or weakly meshed networks. In this paper, a simple technique, which exploits the particular formulation of the branch current estimators, is proposed to deal with zero injection and mesh constraints. Tests performed on an unbalanced IEEE 123-bus network show the capability of the proposed method to further improve efficiency performance of branch current estimators

The Profile of Distal Radius Fracture Colles\u27 Type at Dr. Soetomo Hospital in 2013

The fracture cases become increase because the rapid development of transportation and human mobility today is not offset by good vigilance in conducting the activity. One of the most common location is in the hand and involves distal radius part, named Colles\u27 fracture. Colles\u27 fracture is the most common wrist fracture (almost 80% of the forearm fractures and the incidence rise in elderly people especially woman. The adequate distribution data of Colles\u27 Fracture is not available yet. If this situation keeps going, it will have impacts on the lack of preventive measures and recovery methods. The study was design as descriptive and used secondary data from medical records in Orthopedics and Traumatology Department of Dr. Soetomo Hospital Surabaya. Total 37 patients that included in inclusion criteria. Distal radius fracture Colles\u27 type was common in woman. The most common age was 45-64 years old. Most common causes of fracture was traffic accidents. Left forearm become major affected side. The incidence dominantly occurred at the street. The incidence often occurred at 12.00-18.00. The onset of admission from the incidence place to hospital was less than 8 hours

Employment protection and firm-provided training in dual labour markets

In this paper we leverage a labour market reform (Fornero Law) which reduced firing restrictions for open-ended contracts in the case of firms with more than 15 employees in Italy. The results from a Difference in Regression Discontinuities design demonstrate that after the reform, the number of trained workers increased in firms just above the threshold by approximately 1.5 additional workers. We show that this effect can be explained by the reduction in worker turnover and a higher use of permanent contracts. Our study highlights the potentially adverse effects of employment protection legislation on training in dual labour markets

Development of "Material Gaya" Teaching Materials Based on Creative Science Videos (CSV) for Class VIII Junior High School Students

Teaching materials are a resource for teachers and students to carry out the learning process. Therefore, it is necessary to develop innovative teaching materials that enable students to achieve superior learning outcomes. One of the innovative and creative teaching materials is Creative Science Video-Based Teaching Materials (CSV). In this study, we aim to commercialize creative science teaching materials by using videos as style teaching materials. We also assess product quality based on materials and media reports. The research variables were validated by material, expert and video experts. In addition, the professional quality of audiovisual media has great potential. This research is an R n D with statistical evaluation results of material expert verification by CSV type reaching 3.62, media experts reaching 3.84. Therefore, the conclusion of this study is that science teaching materials such as style teaching materials can be developed through Creative Science Video-Based Teaching Materials (CSV

Sunk capital, unions and the hold-up problem: Theory and evidence from cross-country sectoral data

In this paper we study the hold-up problem by considering the effect of union bargaining power on the level of investment per worker across sectors characterised by different levels of sunk capital investment. We develop a search and matching model with heterogeneous sectors and ex-post collective wage bargaining and test the predictions of the model using a difference-in-difference approach on manufacturing sector data in a set of OECD countries during the period 1980-2000. We find that union power reduces investment per worker particularly in sunk capital intensive industries. We refine our empirical analysis showing that the underlying hold-up problem is exacerbated when strikes are not regulated after a collective contract is signed and there is no arbitration, while the presence of social pacts may sustain cooperative equilibria that alleviate the hold-up problem. Our results are robust to a series of controls and possible endogeneity of union power

Does education protect families' well-being in times of crisis? Measurement issues and empirical findings from IT-SILC data

This study analyses the relationship between education and material well-being from a longitudinal perspective using the European Survey on Income and Living Conditions (EU-SILC) data collected in Italy in four waves (2009-2012). It has two main aims: (i) to measure household material well-being on the basis of householders' responses to multiple survey items (addressed to gather information on the household availability of material resources) by advancing indexes, which can account for global and relative divergences in households' material well-being across survey waves; (ii) to assess how education and other sociodemographic characteristics affect absolute well-being and its variation (i.e. relative well-being) in the time span considered. Both aims are pursued, combining measuring and explanatory modelling approaches. That is, the use of the Multilevel Item Response Theory model allows to measure the global household material well-being and its yearly variation (i.e. relative material well-being) in the four waves. Meanwhile, the use of a multivariate (and multivariate multilevel) regression model allows to assess the effects of education and other sociodemographic characteristics on both components (absolute and relative well-being), controlling for the relevant sources of heterogeneity in the data. The value added to using the proposed methodologies with the main findings and economic implications are discussed