COT-30 Effect of tumor resection in 11C methionine accumulation area on survival in patients with glioblastoma

Aim: The amount of tumor excised in an area enhanced by contrast medium on magnetic resonance imaging strongly affects the survival time of patients with glioblastoma. We investigated the effect of the amount of tumor removal in the 11C methionine (MET) accumulation site on overall survival(OS). Methods: Twenty-six patients (15 male; mean age, 68.9 years) with a diagnosis of glioblastoma who underwent tumor resection at Kizawa Memorial Hospital between June 1, 2015 and August 30, 2021 underwent MET-positron emission tomography (MET-PET) before and after the operation. In a comparison of MET-PET before and after tumor resection, the tumor-to-normal (T/N) ratio reduction (ΔT/N), MET accumulation area reduction (MET-extent of resection [EOR]), and the residual MET accumulation volume (MET-residual tumor volume [RTV]) were calculated. The relationship between these MET-related parameters associated with tumor resection and OS was investigated via univariable analysis. Results: Univariate analysis revealed that ΔT/N was significantly associated with OS (hazard ratio [HR]: 0.98; 95% confidence interval [CI]: 0.97–0.99; p=0.02). MET-RTV was also significantly associated with OS (HR: 1.01; 95% CI: 0.98–1.02; p=0.73) Conversely, MET-EOR (HR: 0.99; 95% CI: 0.97–1.01; p=0.06) was not significantly associated with OS. Conclusions: Aggressive surgical resection of the MET accumulation site significantly prolongs survival in patients with glioblastoma.

Polygon Number Algorithm for Peak-to-Average Ratio Reduction of Massive 5G Systems Using Modified Partial Transmit Sequence Scheme

The high peak-to-average power ratio (PAPR) of the transmit signal is a major shortcoming of OFDM systems, which results in band radiation and distortion due to the nonlinearity of the high-power amplifier (H.P). To resolve the traditional OFDM high-PAPR issue, where the transmit sequence is designed to avoid similar data from being sent in the same order to reduce PAPR, there are numerous conventional ways for lowering the PAPR for OFDM system, such as selective mapping, tone reservation, block coding, filtering, clipping, and partial transmit sequence (PTS). This study proposes a new method called polygon number algorithm (PN) with conventional partial transmit sequence (C-PTS). This method (PN-PTS) processes the entered data before sending it, taking advantage of the number nonsimilarity according to the geometry of the number to prevent direct sending of similar data via PTS, and thus, this improved the level of PAPR rise in the proposed system. The amount of reduction that can be achieved in PAPR is up to 8 dB by different techniques. The best result obtained was the amount of reduction between the conventional method and the proposed method is 4.5683 where N = 64 . Besides this, there is no transmission of side information (SI), which improves transmission efficiency. Finally, this method is easy in the calculation process and the ciphering and deciphering of data, which adds a few calculations.

Study of forced aeration system for fruit and vegetable waste composting

Composting of fruit and vegetable waste (FVW) was investigated in a forced aeration system to determine the effects of aeration rate (AR) and aeration method (AM) on compost quality. Rice husk was mixed with FVW as bulking agent to compost for seven days and aerated in continuous and intermittent at rates of 0.3, 0.6, and 0.9 L min−1. Intermittent aeration at rate of 0.3 L min−1 was observed to have higher initial temperature increasing rate and peak temperature compared to continuous aeration. Moisture loss at rate of 0.3 L min−1 was found smaller than other two rates regardless of AM. With comparison made for similar AR, intermittent aeration had experienced less moisture loss with an average of 17.15 %. The pH of compost was found to vary in aeration method where higher peak pH was found in intermittent aeration at low rate, corresponding to their temperature profile. Largest carbon-to-nitrogen (C/N) ratio reduction was attained by compost treated in intermittent aeration at rate of 0.3 L min−1. Further optimization was performed at a rate of 0.1 L min−1, 0.2 L min−1, and 0.4 L min−1. The result showed an improvement at rate of 0.2 L min−1 in intermittent aeration.