The objective of this study was to develop the oral pathology mobile application (PathoPal) to support dental students' learning process and to identify satisfaction of dental students in using the mobile application. Participants were the third- and fifth- year dental students (193 students) at Faculty of Dentistry, Chulalongkorn University. Students were given one week to use the application then their satisfaction in using the application were gathered via a questionnaire survey. Of 193 participants, 60 percent were satisfied with the application. When compared with textbooks, the most significant advantage was the convenience of use and the speed of data processing in identifying pathological information. Students reported that the application was more accessible than textbooks resulting in their learning process became more effective. In conclusion, the PathoPal application can be helpful for inexperienced dental students as it provides tentative differential diagnoses of all possible oral pathologic diseases supporting learning and clinical reasoning skills.

In this paper, we proposed a hybrid communication approach for disaster recovery system. Playing an important role in rescuing victims, the communication system in the disaster area is usually destroyed. The mobile ad-hoc network (MANET) can replace the original system. MANET can be deployed in the form of peer-to-peer (P2P) approach or infrastructure-based (IB) approach. However, both approaches still have limited flexibility and reliability. Our hybrid approach overcomes the limitations by combining advantages of P2P approach and those of IB approach. The hybrid approach allows victims to directly communicate to rescuers in the disaster area. Since victims need immediate helps from rescuers, appropriate destinations must be selected. Our design of hybrid approach allows victims to quickly send messages to the nearest rescuers without compromising the traffic to a base station. The experiment shows that our hybrid approach provides more than 98% of packet delivery ratio to rescuers.

In this paper, we propose a CPU allocation technique to solve the problem of running volunteer application on a system with Completely Fair Scheduler (CFS) using adaptive reservation. Our allocation technique works across user boundary without requiring administrative privilege. We implemented and evaluated our technique on Linux-based system with the CFS. Our technique could mitigate performance loss of foreground workload. In compute-heavy test and video playback test, performance loss is negligible. While in latency sensitive web server test, performance loss is only about 10 percent. Our technique also improves background workload performance up to 50 percent comparing to traditional static allocation method.

In this paper, we propose effective trusted communication (ETC) using two-mode authentication. ETC combines routing protocol and authentication protocol together to provide trusted communication especially in disaster situations. During disasters, a communication system plays an important role in rescuing victims. Due to infrastructure failure, mobile ad-hoc networks (MANET) must be used. Since most authentication methods rely on trusted-third party, they cannot be used in isolated mobile ad-hoc networks. In addition, most authentication protocols do not provide fast data transmission (if reliable). Our design of ETC allows authenticated communication without compromising data transmission speed.

We propose a minimalist, architectural approach, Secure Bit (patent pending), to protect against buffer overflow attacks on control data (return-address and function-pointer attacks in particular). Secure Bit provides a hardware bit to protect the integrity of addresses for the purpose of preventing such buffer-overflow attacks. Secure Bit is transparent to user software: it provides backward compatibility with legacy user code. It can detect and prevent all address-corrupting buffer-overflow attacks with little runtime performance penalty. Addresses passed in buffers between processes are marked insecure, and control instructions using those addresses as targets will raise an exception. An important differentiating aspect of our protocol is that, once an address has been marked as insecure, there is no instruction to remark it as secure. Robustness and transparency are demonstrated by emulating the hardware, booting Linux on the emulator, running application software on that Linux, and performing known attacks