Hydrodynamical model during east season at Gosong Coastal West Borneo as candidate location of nuclear power plant in Indonesia

Indonesia planned to build the first nuclear power plant in Gosong Coast, Bengkayang Regency, West Kalimantan. This research examined the hydrodynamical conditions in the ocean of Gosong Coast during the eastern season. This hydrodynamic model can be considered in estimating the distribution of various radionuclide wastes that release to the ocean. It was simulated using the Delft3D flow module application for 15 days which included the neap and spring tide conditions. Base on the result of the hydrodynamical model, Gosong Coast had a mixed semidiurnal type of tide with low amplitude. The wind parameters involved higher impacts to the hydrodynamical conditions. The model result did not find significant differences between neap and spring tide periods. There was a flow collision between 2 opposite water currents which was occurred at Burung Archipelagic during flood tide and at the Coastal area of Singkawang City during ebb tide. Therefore, the ocean currents at Gosong Coast flowed directly offshore through Burung Archipelagic during ebb tide. Meanwhile during flood tide, these ocean currents moved to Singkawang and Sambas Coastal area before they deflected toward offshore.

Modeling on 137Cs Radioactive Dispersion in Gosong Coast as The Candidate Location for Nuclear Power Plant

The study of radioactive dispersion in the ocean should be conducted to prepare the construction of nuclear power plant (NPP) in Gosong Coast, West Kalimantan. This study estimated the distribution of 137Cs radioactive from various scenarios of radioactive waste dumping if nuclear emergency is occurred during NPP’s operation. These scenarios were distinguished based on their volume discharges of radioactive waste into the ocean, included 10 m3 (Scenario I), 50 m3 (Scenario II), and 100 m3 (Scenario III). Model dispersions were constructed for 15 days by Delft3D-Flow module. The simulation showed that ocean current directions were not significantly different among spring and neap tide, instead the ocean current during the spring period dominantly increased rather than neap period. Ocean currents at Gosong Coast flowed parallel to the shoreline towards Singkawang Coastal Area during ebb tide. Meanwhile, during flood tide, ocean currents at Gosong Coast flowed offshore through Burung Archipelagic. The dispersed model showed the distribution of 137Cs radioactive for 15 days reaching to coastal areas of Burung Archipelagic, Singkawang, and Southern Sambas Coast. Each scenario of the disposal system did not influence the marine pollution of the West Kalimantan Sea.

A Location Privacy Preservation Method Based on Dummy Locations in Internet of Vehicles

During the procedure, a location-based service (LBS) query, the real location provided by the vehicle user may results in the disclosure of vehicle location privacy. Moreover, the point of interest retrieval service requires high accuracy of location information. However, some privacy preservation methods based on anonymity or obfuscation will affect the service quality. Hence, we study the location privacy-preserving method based on dummy locations in this paper. We propose a vehicle location privacy-preservation method based on dummy locations under road restriction in Internet of vehicles (IoV). In order to improve the validity of selected dummy locations under road restriction, entropy is used to represent the degree of anonymity, and the effective distance is introduced to represent the characteristics of location distribution. We present a dummy location selection algorithm to maximize the anonymous entropy and the effective distance of candidate location set consisting of vehicle user’s location and dummy locations, which ensures the uncertainty and dispersion of selected dummy locations. The proposed location privacy-preservation method does not need a trustable third-party server, and it protects the location privacy of vehicles as well as guaranteeing the LBS quality. The performance analysis and simulation results show that the proposed location privacy-preservation method can improve the validity of dummy locations and enhance the preservation of location privacy compared with other methods based on dummy locations.

No Free Lunch After All: Corporate Political Connections and Firms’ Location Choices

We examine how the presence of a firm’s political connections in a candidate location affects the firm’s likelihood of choosing that location over unconnected but otherwise comparable ones to establish a new subsidiary. First, because of various benefits that political connections can generate for firms, all else equal, firms are more likely to choose the locations in which they have connections with local political leaders. Second, this effect is dampened when local economic conditions may drive local politicians to demand that connected firms engage in economically inefficient but politically desirable tasks, such as hiring superfluous labor. As a result, firms are less likely to choose a politically connected location that also suffers from higher unemployment. Moreover, this dampening effect exists (and becomes stronger) when the connected politicians hold political positions that shoulder greater responsibility for resolving local unemployment issues. Using data on all new subsidiaries established by Chinese listed firms from 2003 to 2009, we obtain empirical evidence that corroborates the hypotheses. Therefore, whether and how firms use their political connections in making location choice is strategic in that it is highly dependent on the economic and political context.

A Data-Based Framework for Identifying a Source Location of a Contaminant Spill in a River System with Random Measurement Errors

This study addresses the problem of identifying the source location of a contaminant spill in a river system when a sensor network returns observations containing random measurement errors. To solve this problem, we suggest a new framework comprising three main steps: (i) spill detection, (ii) data preprocessing, and (iii) source identification. Specifically, we applied a statistical process control chart to detect a contaminant spill with measurement errors while keeping the false alarm rate at less than or equal to a user-specified value. After detecting a spill, we generated a nonlinear regression model to estimate a breakthrough curve of the observations and derive a characteristic vector of the estimated curve. Using the characteristic vector as an input, a random forest model was constructed with the sensor raising the first alarm. The model provides output values between 0 and 1 to represent the possibility of each candidate location being the true spill source. These possibility values allow users to identify strong candidate locations for the spill. The accuracy of our framework was tested on part of the Altamaha River system in Georgia, USA.

KESESUAIAN LOKASI DAN TANGGAPAN MASYARAKAT UNTUK TEMPAT PEMROSESAN AKHIR (TPA) SAMPAH DI KOTA KOTAMOBAGU

This study aims to analyze the appropriate location and community responses for waste landfill sites and to determine the factors that limit the level of land suitability for waste landfill in Kota Kotamobagu. The study was conducted in the designated area for the development of the Kotamobagu Municipal TPA location based on the RTRW document of Kota Kotamobagu for three months from February to March 2017. This research is observational. Research data is analyzed through quantitative descriptive method. The results showed that in the area designated as the location of TPA development in Kota Kotamobagu there is one candidate location that enter on the category of potential worthy in the area of West Mongkonai Village based on the criteria of the feasibility of SNI 03-3241-1994. Communities around the landfill development / expansion sites for the Small Poyowa TPA tend to accept the presence of waste landfill and for the development site of West Mongkonai waste landfill, people in the area tend to deny the existence of waste landfill sites. The limiting factor of land suitability for the landfill location in Kota Kotamobagu is classified into two namely the main limiting factor that is the social environment of the community in the form of rejection of the landfill location by the community around the landfill site and the physical limiting factor which consists of land permeability, rain intensity and agricultural area.

Mapping of optimum placement of distributed generation in meshed power networks with appropriate technologies

Purpose This study aims to propose a sensitivity-based methodology for the optimum accommodation of distributed generation (DG) units in meshed power networks with appropriate technologies. The effect of load variation is incorporated into the proposed methodology to identify the most trusted locations for DG placement. Design/methodology/approach The effectiveness of minimizing active power losses is considered a key criterion. A priority list comprising both sensitivity indexes and realistic indicators is deduced to rank the optimum sites for the placement of DG units. A sorting index for distinguishing the suitable DG type(s) for each candidate location is organized. Three common DG types are considered in this work. The modified IEEE 30-bus meshed system is chosen to perform the proposed methodology. Findings Results demonstrate that the obtained priority index can be used to achieve the best real loss minimization rates. Numerous load buses can be safely excluded as candidate locations using the proposed approach. Consequently, the methodology can minimize the computational process of diagnosing the optimum sites for DG accommodation. Originality/value The findings determine that instead of installing many DG units at various locations with one DG type, a few certain load buses can be used to accommodate more than one DG type and significantly reduce losses.