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Papers by Tho Mai
Nuclear Science and Technology, 2014
After reconstruction, the Dalat Nuclear Research Reactor (DNRR) was inaugurated on March 20th, 19... more After reconstruction, the Dalat Nuclear Research Reactor (DNRR) was inaugurated on March 20th, 1984 with the nominal power of 500 kW. Since then the production of radioisotopes and labelled compounds for medical use was started. Up to now, DNRR is still the unique one in Vietnam. The reactor has been operated safely and effectively with the total of about 37,800 hrs (approximately 1,300 hours per year). More than 90% of its operation time and over 80% of its irradiation capacity have been exploited for research and production of radioisotopes. This paper gives an outline of the radioisotope production programme using the DNRR. The production laboratory and facilities including the nuclear reactor with its irradiation positions and characteristics, hot cells, production lines and equipment for the production of Kits for labelling with 99mTc and for quality control, as well as the production rate are mentioned. The methods used for production of 131I, 99mTc, 51Cr, 32P, etc. and the pr...
BMC Surgery, 2021
Background To present a surgical technique of single-incision laparoscopic-assisted endorectal pu... more Background To present a surgical technique of single-incision laparoscopic-assisted endorectal pull-through (SILEP) with suspension sutures using conventional instruments for Hirschsprung disease (HD) and its long-term follow-up outcomes. Methods The procedure began with a 1 cm transumbilical skin incision. Three separate punctures were made in the fascia with a 5 mm scope in the middle and 5 mm and 3 mm ports for working instruments on the left and right, respectively. The first suspension suture was placed to secure the sigmoid colon to the abdominal wall. A window was created through the rectal mesentery, and dissection around the rectum was carried out. The second suspension suture was performed to suspend the rectovesical peritoneal fold or the rectovaginal peritoneal fold to the abdominal wall. Dissection around the rectum was continued downward to approximately 1 cm below the peritoneal fold. Then, the operation was completed by a transanal approach. Results Forty patients un...
2020 IEEE Eighth International Conference on Communications and Electronics (ICCE), 2021
Monitoring system installed at a parking field is to update real time data of vacant parking lots... more Monitoring system installed at a parking field is to update real time data of vacant parking lots to central management and to provide search and book services to car drivers. Camera attached with image processing unit running Deep Learning based algorithms to detect vacant/occupied parking lots is promising with rather high accuracy. In this work, we propose a novel solution using mAlexNet, a CNN-based model, to classify vacant or occupied state of each parking lot snapshot, with a pre-processing stage, camera adjustment method, enabling the solution to be automatically adaptive with the condition setting variations. The solution is capable to run on resource constrained processors like Rasberry Pi 4 and has been tested on parking fields at our university campus, showing the accuracy of over 97% and rather fast processing pace of 0.743 seconds in average for each frame capturing 24 parking lots.
Ekonomski anali, 2020
This study examines the relevance of board independence to stock return volatility for a sample o... more This study examines the relevance of board independence to stock return volatility for a sample of 160 companies listed on the Vietnamese stock market over ten years (2008-2017). After controlling for potential endogeneity, we find that the presence of non-executive directors on the board tends to increase firm risk. The results indicate that non-executive directors do not play a supervisory role under the agency theory. Our findings remain robust when we apply alternative measures of the dependent variable.
Nuclear Science and Technology, 2014
After reconstruction, the Dalat Nuclear Research Reactor (DNRR) was inaugurated on March 20th, 19... more After reconstruction, the Dalat Nuclear Research Reactor (DNRR) was inaugurated on March 20th, 1984 with the nominal power of 500 kW. Since then the production of radioisotopes and labelled compounds for medical use was started. Up to now, DNRR is still the unique one in Vietnam. The reactor has been operated safely and effectively with the total of about 37,800 hrs (approximately 1,300 hours per year). More than 90% of its operation time and over 80% of its irradiation capacity have been exploited for research and production of radioisotopes. This paper gives an outline of the radioisotope production programme using the DNRR. The production laboratory and facilities including the nuclear reactor with its irradiation positions and characteristics, hot cells, production lines and equipment for the production of Kits for labelling with 99mTc and for quality control, as well as the production rate are mentioned. The methods used for production of 131I, 99mTc, 51Cr, 32P, etc. and the pr...
BMC Surgery, 2021
Background To present a surgical technique of single-incision laparoscopic-assisted endorectal pu... more Background To present a surgical technique of single-incision laparoscopic-assisted endorectal pull-through (SILEP) with suspension sutures using conventional instruments for Hirschsprung disease (HD) and its long-term follow-up outcomes. Methods The procedure began with a 1 cm transumbilical skin incision. Three separate punctures were made in the fascia with a 5 mm scope in the middle and 5 mm and 3 mm ports for working instruments on the left and right, respectively. The first suspension suture was placed to secure the sigmoid colon to the abdominal wall. A window was created through the rectal mesentery, and dissection around the rectum was carried out. The second suspension suture was performed to suspend the rectovesical peritoneal fold or the rectovaginal peritoneal fold to the abdominal wall. Dissection around the rectum was continued downward to approximately 1 cm below the peritoneal fold. Then, the operation was completed by a transanal approach. Results Forty patients un...
2020 IEEE Eighth International Conference on Communications and Electronics (ICCE), 2021
Monitoring system installed at a parking field is to update real time data of vacant parking lots... more Monitoring system installed at a parking field is to update real time data of vacant parking lots to central management and to provide search and book services to car drivers. Camera attached with image processing unit running Deep Learning based algorithms to detect vacant/occupied parking lots is promising with rather high accuracy. In this work, we propose a novel solution using mAlexNet, a CNN-based model, to classify vacant or occupied state of each parking lot snapshot, with a pre-processing stage, camera adjustment method, enabling the solution to be automatically adaptive with the condition setting variations. The solution is capable to run on resource constrained processors like Rasberry Pi 4 and has been tested on parking fields at our university campus, showing the accuracy of over 97% and rather fast processing pace of 0.743 seconds in average for each frame capturing 24 parking lots.
Ekonomski anali, 2020
This study examines the relevance of board independence to stock return volatility for a sample o... more This study examines the relevance of board independence to stock return volatility for a sample of 160 companies listed on the Vietnamese stock market over ten years (2008-2017). After controlling for potential endogeneity, we find that the presence of non-executive directors on the board tends to increase firm risk. The results indicate that non-executive directors do not play a supervisory role under the agency theory. Our findings remain robust when we apply alternative measures of the dependent variable.