Technology Reports of Kansai University (ISSN: 04532198) is a monthly peer-reviewed and open-access international Journal. It was first built in 1959 and officially in 1975 till now by kansai university, japan. The journal covers all sort of engineering topic, mathematics and physics. Technology Reports of Kansai University (TRKU) was closed access journal until 2017. After that TRKU became open access journal. TRKU is a scopus indexed journal and directly run by faculty of engineering, kansai university.
Technology Reports of Kansai University (ISSN: 04532198) is a peer-reviewed journal. The journal covers all sort of engineering topic as well as mathematics and physics. the journal's scopes are
in the following fields but not limited to:
Zhonghua er bi yan hou tou jing wai ke za zhi = Chinese journal of otorhinolaryngology head and neck surgery
An experimental laboratory was conducted to treat produced water by kapok fiber adsorbent, activated using sodium hydroxide (NaOH) 5% wt. and hot water at 100 0C followed by ultrafiltration membrane to reduce total dissolved solids (TDS), barium, and phenol concentration. The research variables were operating times of 30, 60, and 90 min, and the flow rate of produced water samples was 5 L/min, 6 L/min, and 7 L/min. The scanning electron microscope (SEM-EDX) investigated the kapok fiber's surface. The results showed that the decrease in TDS, barium, and phenol by activated kapok fibers was 52.8%, 66.77%, 72.55%, respectively. Further, filtrate treatment from kapok fibers column in ultrafiltration membranes (UF) showed the removal of TDS, barium, and phenol removal achieved 43.12%, 99.76%, and 42.44% at a feed flow rate of 5 L/min and operation time of 90 min. The total removal for the currently proposed system is 95.91% TDS, 99.92% barium, and 84.20% phenol. Produced water pretreatment using kapok fibers absorbent followed by UF membrane reduce TDS, barium, and phenol concentration from produced water. Finally, the permeates of the ultrafiltration membrane followed Indonesian standards for wastewater quality.
Sending important information over the Internet has become a norm nowadays. Protection must be done so that information is not easily hacked and misused. Steganography is one of protection method in which hidden information is inserted into a digital multimedia channel. This paper aims to hide image messages into audio files with different formats using the Least Significant Bit (LSB) and Discrete Cosine Transform (DCT) approaches. We conducted a performance test by measuring the Peak Signal to Noise Ratio (PSNR), endurance to compression, and transparency of the host that has been inserted the message. The results showed that the PSNR value of audio files through the DCT process was greater than that of LSB, subjective assessment of the mean opinion score related to audio files through the LSB process was better than DCT, and all audio files did not have resistance to a compression mode.