Blockchain-Based Community Safety Security System with IoT Secure Devices

Humans frequently need to construct a huge number of buildings for occupants in large cities to work or live in a highly developed civilization; people who live in the same building or same area are defined as a community. A thief stealing items, a burglary, fire hazards, flood hazards, earthquakes, emergency aid, abnormal gas leakage, strange behavior, falling in a building, fainting in a building, and other incidents all threaten the community’s safety. Therefore, we proposed a blockchain-based community safety security system that is combined with IoT devices. In the proposed scheme, we designed multiple phases to process the alarm triggered by IoT devices. IoT devices can be set up in two types areas: private and public areas. Both types of IoT devices’ alarms have different process flow for the response and records checking phase. All records are saved in the Blockchain Center to assure the data can be verified and cannot be forged. During the communication between sender and receiver, we implemented some security methods to prevent message repudiation, prevent transmission intercept, prevent replay attacks, and ensure data integrity. We also implemented a clarifying mechanism to ensure that all system participants can have confidence in the system’s processing methods. The proposed scheme can be used in communities to improve community safety and prevent unnecessary conflicts.

BUILDING PROTECTION DESIGN IN FIRE HAZARD PREVENTION (CASE STUDY: FAJAR UNIVERSITY BUILDING (UNIFA) MAKASSAR)

<p>The growth and arrangement of existing buildings are sometimes not balanced with the readiness of building and urban infrastructure. The main danger of fire for humans is poisoning due to inhalation of smoke, about 75% of human deaths in burning buildings are caused by smoke, about 25% of deaths are caused by heat generated by fire. To carry out the functions and uses, the building consists of several systems, the system consists of sub-systems that form integrally in a single unit. Fire prevention is one of the building systems, which aims to save lives. Fire prevention is one aspect of building safety. To find out and assess the level of reliability of a building against fire hazards, a problem formulation is formulated, namely How to design a fire prevention analysis that can be applied to buildings. The conclusion that can be drawn regarding the design of a fire prevention inspection system and its application is, the design of a building reliability inspection system in fire prevention is one of the tools in assessing and inspecting buildings for fire prevention measures in buildings. Inspection of building reliability in fire prevention is carried out at the smallest level or on building components, can provide a more detailed assessment/inspection of the fire prevention system, Assessment of Rescue Means Components, Assessment of Active Protection Components, Passive Protection Assessment Means.</p>

Application of numerical modeling to assess the influence of the longitudinal slope in a road tunnel on the fire hazards spread

Рассмотрено влияние продольного уклона автодорожного тоннеля на распространение в нем опасных факторов пожара при возникновении загорания. Для оценки этого влияния использован полевой метод моделирования. Проведен анализ полученных результатов. Сделан вывод о том, что «классическое» понимание картины пожара, основывающееся на принципе «чем больше уклон тоннеля, тем быстрее происходит блокирование», при определенных условиях может не соответствовать действительности. При этом большое влияние на результат расчетов может оказывать постановка граничного условия постоянства давления. One of the important issues in the design and construction of tunnels is to ensure their fire safety. To take into account the characteristics of a particular object and make decision on its effective fire protection, it is necessary to study the influence of various factors on the dynamics of a possible fire. Conducting field tests in this case is expensive and time-consuming. Therefore, one of the most effective methods in this case is numerical modeling. In this paper there is considered the issue of the influence of the longitudinal slope value of a road tunnel on the dangerous factors spread in case of fire. The assessment was carried out by simulating a fire in a model tunnel using the field method. A model tunnel of rectangular cross-section was chosen for conducting numerical experiments. The SOFIE software package was used to implement the model. To evaluate the results obtained there were created the fields of optical smoke density in the central longitudinal section at various time points. This dangerous fire factor is the determining factor because it reaches critical values most quickly. As a result of calculations in the work there was established the influence of the tunnel slope value on the fire hazards spread. It is found that the nature of fire hazards spread in a tunnel without a slope significantly differs from their propagation pattern in an inclined tunnel. If there is a slope, the blocking of tunnel sections (escape routes) up the slope during the first minutes of fire occurs much faster than down, so it is preferable to evacuate people in case of an emergency down the slope. Under certain conditions the principle “the greater the slope of the tunnel, the faster the blocking occurs” can be untrue. At the same time, the obtained result depends on the setting of the boundary condition of pressure constancy during the calculation and can differ from the real fire performance, however, in general, it is not an underestimation of fire danger and can be used in engineering calculations.

Virtual Fire Evacuation Drills through a Web-Based Serious Game

Evacuation capacity is very important in building fire. In order to improve the safety evacuation capacity of occupants, a web-based serious game for virtual fire evacuation drills is proposed. As a prototype of the serious game, a stand-alone system for virtual drill had been developed. On this basis, the system framework of the serious game is first designed for web-based training, including the database, front and back ends. Secondly, an optimization solution including fire scenes and web codes is designed for smooth rendering performance. Lastly, a solution is designed to visualize the evacuation paths of numerous trainees, which can be used to reveal the evacuation rules, and an evaluation model of evacuation performance is created considering the features of evacuation paths and fire hazards, to provide comprehensive feedback for trainees. Thus, a convenient and accessible web-based serious game was developed. More than 100 people participated in the online virtual evacuation drill of a dormitory building fire. Through the drills, the average evacuation time of the trainees decreases from 79.77 s to 54.32 s, and the safety scores of the trainees improve from 74.71 to 81.21. Therefore, the evacuation abilities of trainees gradually improve, which demonstrates the effectiveness of the drill. Consequently, virtual fire drills using a web-based serious game can play an important role in improving the evacuation ability.

Metal Object Detection in a Wireless High-Power Transfer System Using Phase–Magnitude Variation

Recently, wireless charging technologies for large moving objects, such as electric vehicles and robots, have been actively researched. The power transmitting and receiving coils in most large moving objects are structurally separated by a given distance, which exposes a high output power to the outside world. If a foreign metal object enters the area between these two coils during wireless power transfer, fire hazards or equipment damage may occur. Therefore, we propose a method for detecting foreign metal objects in the gap between the transmitting and receiving coils in a wireless high-power transfer system. A resonant detection coil set is used to exploit the change induced in electrical characteristics when a foreign metal object is inserted. The mutual inductance of the foreign metal object changes the impedance of the detection coil set. We developed a simple circuit to detect both the magnitude and phase change of the voltage signal according to the altered impedance. Additionally, we implemented a prototype of a wireless power transfer system with a detection system to verify that even small foreign metal objects can be detected effectively.

Implications of the COVID-19 pandemic on fire hazards forest and land in Barru District, South Sulawesi

The Covid-19 pandemic poses a threat of forest destruction, especially forest fires, along with the increase of intensity of humans entering and exploring the forest. It is suspected that many people who live in urban areas have lost their jobs due to layoffs and moved to villages, and then opened new lands because their supporting facilities were no longer relevant to the current conditions, the COVID-19 pandemic. These people who abruptly start their activities in the forest and do not understand the rules of preventing forest fires are making the forests vulnerable to fires. The purpose of this study was to determine the effect of the COVID-19 pandemic on the dangers of forest and land fires in South Sulawesi. It used a descriptive method, and data was collected through in-depth interviews with communities that are affected by the COVID-19 pandemic and live around the fire-prone forest areas. The results of the observation were processed by descriptive analysis to get the conclusion. The results showed that about 72% of the affected people are carried out activities in forest areas which 78% of them did not understand the rules of forest and land fire hazards. The results of this study will be recommended to the government, particularly to the policymakers in controlling forest and land fires, especially during the Covid-19 pandemic.

Fire Analysis of Simply Supported Reinforced Concrete Beam

This paper presents analysis of simply supported reinforced concrete beam exposed to standard fire. Eurocode standard provides recommendations for analysis of reinforced concrete structure under fire. The thermal and structural responses of structure are calculated using commercially available software ANSYS. An advance calculation methodology must be implemented to estimate the behavior of structure and to understand thermal and mechanical properties of material during fire. These include transient thermal as well as structural analysis of structure. Finite element software ANSYS is capable to conducting thermal analysis as per defined material properties. It is important to study effect at elevated temperature on structure to understanding the behavior pattern and decrease the losses caused fire hazards.