scholarly journals Evaluating the Effectiveness of Regulation Schemes in Improving Navigation Condition of Reservoir Channels

2021 ◽  
Vol 690 (1) ◽  
pp. 012004
Author(s):  
Yang Lu ◽  
Hui Xu ◽  
Guo-bin Li ◽  
Qian-qian Shang
Keyword(s):  
Navigation Condition ◽  
Effectiveness Of Regulation

scholarly journals Estimation of Dietary Intake of Radionuclides and Effectiveness of Regulation after the Fukushima Accident and in Virtual Nuclear Power Plant Accident Scenarios

2018 ◽  
Vol 15 (8) ◽  
pp. 1589 ◽  
Author(s):  
Michio Murakami ◽  
Takao Nirasawa ◽  
Takao Yoshikane ◽  
Keisuke Sueki ◽  
Kimikazu Sasa ◽  
...  
Keyword(s):  
Cost Effectiveness ◽  
Power Plant ◽  
Nuclear Power Plant ◽  
Dietary Intake ◽  
Emergency Preparedness ◽  
Nuclear Power ◽  
Food Distribution ◽  
Fukushima Accident ◽  
Accident Scenarios ◽  
Effectiveness Of Regulation

Evaluation of radiation exposure from diet is necessary under the assumption of a virtual accident as a part of emergency preparedness. Here, we developed a model with complete consideration of the regional food trade using deposition data simulated by a transport model, and estimated the dietary intake of radionuclides and the effectiveness of regulation (e.g., restrictions on the distribution of foods) after the Fukushima accident and in virtual accident scenarios. We also evaluated the dilution factors (i.e., ratios of contaminated foods to consumed foods) and cost-effectiveness of regulation as basic information for setting regulatory values. The doses estimated under actual emission conditions were generally consistent with those observed in food-duplicate and market-basket surveys within a factor of three. Regulation of restricted food distribution resulted in reductions in the doses of 54–65% in the nearest large city to the nuclear power plant. The dilution factors under actual emission conditions were 4.4% for radioiodine and 2.7% for radiocesium, which are ~20 times lower than those used in the Japanese provisional regulation values after the Fukushima accident. Strict regulation worsened the cost-effectiveness for both radionuclides. This study highlights the significance and utility of the developed model for a risk analysis of emergency preparedness and regulation.

Case Study of Ship Squat in Sulina Channel Using NTPRO 5000 Navigational Simulator

2015 ◽  
Vol 809-810 ◽  
pp. 1193-1198
Author(s):  
Petru Sergiu Șerban
Keyword(s):  
Maximum Speed ◽  
Navigation Condition

paper presents a case study of ships passing through shallow and narrow waters in Sulina Channel. The method used in this research was simulation using NTPRO 5000 navigational simulator and it was studied the variation of ship squat, draft and under keel clearance for several military ships similar to Romanian Navy vessels, sailing with different speeds. The purpose of this research was to find out which ship types could navigate through Sulina Channel and what is the maximum speed they could pass without grounding due to ship squat. The integration of the trials results showed what the safe speed for each vessel was and it was concluded that the maximum speeds were 8, 12, and 16 knots. Also, a difference between desired and real speed was observed, caused by the restrictive navigation condition. Numerous researches are being done in ship squat domain and Sulina Channel is one of the canals where this phenomenon is studied, but squat simulation on military ships has never been done before in this canal.

scholarly journals Research on shore-based intelligent vessel support system based on multi-source navigation sensors simulation

2019 ◽  
Vol 15 (7) ◽  
pp. 155014771986478
Author(s):  
Xiao Yang ◽  
Jing-jing Lian ◽  
Hongxiang Ren
Keyword(s):  
Simulation Model ◽  
Support System ◽  
Industry 4.0 ◽  
Related Data ◽  
Navigation Condition ◽  
Echo Sounder

Under the guidance of industry 4.0, peoples pay more attention to the intelligent equipment and system. Intelligent vessel without crew on board has acquired growing attention worldwide over the years. The navigation condition of intelligent vessel without crew at sea should be monitored and controlled by the shore-based intelligent vessel support system. The navigation-related data collected by the multi-source navigation sensors should be presented on the shore-based support system in an efficient and friendly way. This article presents a simulation model for multi-source navigation sensors such as echo sounder and electronic position-fixing system. Furthermore, this work proposes an efficient architecture for the shore-based support system by way of multi-source navigation sensors simulation. The results show that the simulation model of multi-source navigation sensors is efficient for the simulation of echo sounder and electronic position-fixing system. The shore-based intelligent vessel support system based on multi-source navigation sensors simulation can present navigation-related data and monitor the condition of intelligent vessel at sea.

Study on Economical Channel Width for Large LNG Vessel

2012 ◽  
Vol 204-208 ◽  
pp. 2324-2329
Author(s):  
Wei Zhi Guo ◽  
Jing Xian Liu ◽  
Zhao Liu ◽  
Kai Wang
Keyword(s):  
Channel Width ◽  
Design Code ◽  
Acceptable Risk ◽  
Ship Maneuvering ◽  
Original Plan ◽  
Local Navigation ◽  
Risk Rate ◽  
Design Proposal ◽  
Navigation Condition ◽  
Ship Handling

The existing design code of natural gas wharf appears to be rough for LNG channel width in the quantitative, and lacks of testing and risk evaluation. The outstanding problem is studied by relying on the study on navigation safety of Shandong LNG project. Taking a 360 meters LNG vessel as a simulation object, according to the local navigation condition designed of a condition scheme, the NT-PRO4000 type of ship maneuvering simulator is used to make a ship handling simulation experiment about the large LNG vessel, and the statistics of the ship track frequency is analyzed. Large LNG vessel’s acceptable risk standard is designed by introducing the concept of social general acceptable risk standard, to calculate the channel width design proposal based on the acceptable risk standard of large LNG vessel. Finally, the risk probabilities are evaluated about the design proposal and the original plan by grounding model, the economic channel width value in the same risk rate is obtained, and providing a new idea for the study of safety and economic channel width for LNG channel.

A Meta-Analysis of Driver Eye-Scanning Behavior While Navigating

1995 ◽  
Vol 39 (17) ◽  
pp. 1127-1131 ◽  
Author(s):  
Thomas A. Dingus
Keyword(s):  
Visual Attention ◽  
Meta Analysis ◽  
Low Frequency ◽  
Visual Display ◽  
Graphic Representation ◽  
Baseline Condition ◽  
Left And Right ◽  
Scanning Behavior ◽  
Frequency Occurrence ◽  
Navigation Condition

A meta-comparison of link analyses was performed using two eye scanning studies. One study was an analysis of the Etak navigator performed by Antin, Dingus, Hulse and Wierwille, (1990). Antin and his associates compared the Etak system to a paper map control condition and a memorized route baseline condition. The second study was an evaluation of the TravTek system performed by Dingus, McGehee, Hulse, Jahns, Natarajan, Mollenhauer and Fleischman (1995). The TravTek Camera Car Evaluation tested six different navigation conditions (a TravTek visual display of a full, heading-up route map with voice guidance, the same TravTek route map without voice guidance, a TravTek visual display showing a graphic representation of static turn-by-turn information, the same turn-by-turn screens without voice guidance, a textual paper direction list with large legible font, and a conventional paper map). The eye glance data shown in the comparison of these two studies revealed several interesting findings. In all conditions, scanning of instruments, mirrors and signs/ landmarks was a low frequency occurrence and largely constant. Increases in visual attention by a navigation condition draws attention from forward, left and right roadway scanning resources. Thus, navigating draws upon potentially valuable accident avoidance resources in some circumstances. The eye scanning results also shared the relative benefits of the addition of a highlighted route to a moving map display, the simplification of a visual display from a full map to a turn-by-turn graphic, and the addition of a voice supplement to a navigation aid.

scholarly journals Comparative Analysis of the Effectiveness of Regulation of Aeration Depending on the Quantitative Characteristics of Treated Sewage Water

2016 ◽  
Vol 2016 ◽  
pp. 1-9 ◽  
Author(s):  
Myroslav Malovanyy ◽  
Vira Shandrovych ◽  
Andriy Malovanyy ◽  
Igor Polyuzhyn
Keyword(s):  
Comparative Analysis ◽  
Dissolved Oxygen ◽  
Ammonium Nitrogen ◽  
Sewage Water ◽  
Initial Concentration ◽  
Treated Sewage ◽  
Quantitative Characteristics ◽  
Aeration Process ◽  
Effectiveness Of Regulation

Monitoring of work of the aeration tanks of operating town treatment plants is done. Based on the obtained results a conclusion has been drawn that sewage water is improperly treated from ammonium nitrogen. The velocity of the aeration process, depending on the concentration of dissolved oxygen and ammonium nitrogen, is investigated. The obtained investigation data became the basis for modeling the aeration process in industrial conditions depending on the required initial concentration of ammonium nitrogen.

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