Experimental Study on Measurement of Time to Reach Ignition Point Based on Installation of Addressable Detector in Traditional Market

Because fire in a traditional market spreads very fast, it is necessary to install an alarm system that can detect the fire early and identify the exact ignition point. The addressable detector can be used to identify the ignition point quickly using the address function. In this study, an existing general-type detector installed in a traditional market was replaced with an addressable detector, and firefighters measured the time taken to reach the initial ignition point. From the experimental results, the average time taken from DaeSin 119 Safety Center to reach the virtual ignition point on the 2^nd floor of the 2^nd district of Seomun Market was 3 min 12 s when the ＜general-type detector-P-type receiver＞ system was applied. However, the time was 2 min 8 s when the ＜addressable-type detector-R-type receiver＞system was applied. Based on the experimental investigation, it was confirmed that the time required for firefighters to reach the initial ignition point decreased when the existing general-type detector was replaced with the addressable detector.

Performance Analysis of the the Single Alarm Detector in the Rooms of Single Houses by Computer Simulation

This study was conducted to examine the performance in the space for a single alarm type detector installed in a single house. Three types of houses were used, including two types of one-story and two-story houses. A computer simulation program was used to predict the sound pressure level in response to the occurrence of an alarm sound in a residential space. The characteristics of the sound source applied to the simulation were directly measured and used as input data. As a result of simulation, it was found that the sound pressure level in the kitchen and living room generally met the standard when the alarm sound of the detector occurred. However, the sound pressure level in the bedroom was predicted to be at least 20 dB (A) lower than the American Fire Protection Association standard of 75 dB (A). Therefore, a plan should be prepared to maintain a sufficient sound level in the bedroom space inside the house, and efforts will be needed to ensure safe evacuation in case of fire by establishing relevant standards.

Rancang Bangun Automatic Human Blood Type Detector Menggunakan Sensor Cahaya Bh1750 Berdasarkan Sifat Optik dengan Metode ABO

Abstrak Penelitian ini bertujuan untuk merancang dan membangun sebuah alat Automatic Human Blood Type Detector berdasarkan sifat optik dengan metode ABO, lalu menentukan karakteristik sensor dan membandingkan dengan hasil pengujian laboratorium. Hasilnya telah berhasil dirancang sebuah Automatic Human Blood Type Detector menggunakan sensor cahaya BH1750, LED, motor servo, Arduino Uno dan dengan output yang ditampilkan pada layar LCD 16X2. Karakterisasi sensor cahaya BH1750 dilakukan dengan cara membandingkannya dengan sensor LDR dan sensor cahaya pada smartphone, didapatkan nilai rata-rata intensitas cahaya dari ketiga sensor tersebut relatif sama yaitu berada pada range 8000 – 9000 lx. Tetapi nilai ketelitian sensor cahaya BH1750 lebih tinggi dibandingkan dengan kedua sensor lainnya yaitu sebesar 97.74 %. Dan alat ini memiliki nilai presentase keberhasilan sebesar 91,67 % dari 12 orang responden. Abstract The aim of this research is to design and build a device Automatic Human Blood Type Detector through ABO method based on the optical feature. Thus, investigating the characteristic of censor in order to be compared to the laboratory examination is what this research has its focus on. The ultimate parts of the device have applied light censor BH1750, LED, servo motor, Arduino Uno, and the output that is demonstrated on the 16x2 LCD screen. The comparison of LDR censor and light censor has created a characteristic of light censor BH1750. It can be found that the average point of light intensity from the three types of censor are rather similar―they range from 8000 to 9000 lx. The difference is that light censor BH1750 has a more increased precision stage of 97.74%, compared to the other two censors. Moreover, this device has achieved a success level of 91.67% from 12 respondents. Program Studi Fisika, Fakultas Sains dan Teknologi, Universitas Islam Negeri Syarif Hidayatullah Jakarta, Jalan. Ir. H. Djuanda No.95, Cempaka Putih, Ciputat, Kota Tangerang Selatan, Banten 15412, Indonesia

Reconstruction on fast neutron CT for concrete structure inspection with a pixel-type detector by applying linear scanning method

Concrete structure has been widely used in bridges and highways, however, its performance will be deteriorated after long term serving or suffering disaster. Since fast neutron has strong transmission ability and is sensitive to water content in the concrete structure, it can provide an effective probe to inspect the inner structure of concrete with non-destructive way. Thus, we propose a fast neutron imaging and reconstruction system of 3D CT for concrete structure inspection with Riken accelerator-driven compact neutron source (RANS) using a fast neutron pixel-type detector, which has 8×8 pixels. To have a good space resolution on the reconstructed image, a rotation + linear scanning method is devised and is used to collect the projection data from experiment or calculation. In this paper, reconstruction for a concrete object containing both iron bars and acrylic bars for simulation of water has been conducted. As a result, 3D image of 1cm diameter bar is reconstructed by the sparse reconstruction algorithm.