Tainan University of Technology

About: Tainan University of Technology is a education organization based out in Tainan City, Taiwan. It is known for research contribution in the topics: Password & Authentication. The organization has 311 authors who have published 641 publications receiving 10826 citations.

A novel authentication scheme for anonymity and digital rights management based on elliptic curve cryptography

Abstract: As the internet makes data transmission easy and fast, digital contents of all kinds can be spread all over the world at a shocking speed. Along with such amazing swiftness and convenience, however, modern computer and communication technologies have also brought various kinds of issues associated with digital rights management. Digital rights management (DRM) systems are access control technologies used to restrict the use, modification, and distribution of proprietary hardware and copyrighted works. Now, in view of modern people's heavy dependence on their mobile devices, we consider it a good idea to design a DRM scheme on the basis of elliptic curve cryptography (ECC). In this paper, we shall review Amin et al.'s (2016) scheme and point out some security weaknesses we have found. Then, with the security flaws mended, we shall propose an improved ECC-based protocol for DRM that is especially suitable for applications on mobile devices.

Energy usage of residents on offshore Islands in Taiwan

Abstract: A field study was conducted through interviews on offshore islands in Taiwan to investigate the energy usage of local residents. A comparison of household appliance usage in mainland Taiwan with that on the offshore islands revealed that, overall, the most commonly used household appliances are steam cookers/rice cookers, water dispensers, and washing machines. For other household appliances , Levels 2 and 3 offshore isles have lower use penetration rates compared with those in mainland Taiwan and on Level 1 offshore isles, particularly for the use of computers. By contrast, the use penetration rate for chest freezers on Levels 2 and 3 offshore isles is high, and each household has one or more freezers on average. This appliance is not a commonly observed household product in mainland Taiwan or on Level 1 offshore isles. Furthermore, because of the government policy, every household on parts of Level 2 offshore isles and on all Level 3 offshore isles has a fixed monthly charge of electricity. The transportation of liquefied petroleum gas is also inconvenient, and the gas price is slightly higher, leading to the tendency of residents to consume excessive amounts of electrical energy, which does not correspond with the aim of the government to conserve energy and reduce carbon emissions; thus, the relevant authorities’ review and improvement on energy consumption on Levels 2 and 3 offshore isles are required.

Computed tomography scan as a diagnostic tool for supraglottitis in adults.

Abstract: We agree that the pulmonary embolism rule-out criteria (PERC) should be applied only to clinical scenarios with a low pretest probability (PTP), where it has been previously validated. We also agree that out study design has some limitations, namely, you mentioned that we did not include all patients suspected of having pulmonary embolism (PE; ie, those whom had D-dimer testing completed that was negative precluding further testing) [1]. As mentioned, including these patients would have resulted in a negative predictive value (NPV) for PERC closer to the results extrapolated from your study, mentioned in the correspondence (NPV, 99.8%; 95% confidence interval, 98.7%-100%) [2]. Because we did not include all “low-risk” patients in our study, we came to the similar conclusion that the NPV would have been higher, with a narrower confidence interval, further strengthening the argument that PERC may be used safely when PTP is low for PE. We also agree that the one case of PE in our sample of 83 patients whom were PERC negative may have had a moderate to high PTP for PE, precluding use of PERC in the evaluation for PE. As mentioned by Kline et al in the original derivation of PERC, there are numerous clinical factors not included in the rule that may lead to further testing in any given patient (ie, morbidly obese patients, strong family history of thrombosis, concurrent β-blocker use, patients with amputations, etc.) [3]. Thus, physicians must impose clinical judgment for patients with borderline or indeterminate clinical variables, as there is no one simple nomogram available for safe use in every clinical scenario.

An Improvement Data Hiding Scheme Based on Formula Fully Exploiting Modification Directions and Pixel Value Differencing Method

Abstract: Recently, a modified data hiding scheme based on pixel value differencing and improving exploiting modification directions is proposed by Shen and Huang. There are two major contributions in this scheme. One is to enhance the embedding rate and good embedding capacity and the other is an optimization problem used to solve the overflow/ underflow problem. In fact, they propose the similar brute force method to solve overflow/underflow problem in their proposed scheme. To overcome the overflow/underflow problem exactly, we will propose the close form to solve this problem in this paper. Then, an improvement data hiding scheme based on FFEMD (Formula Fully Exploiting Modification Directions) and pixel value differencing method is proposed. According to our analysis, it is not only to keep the advantages of Shen-Huang scheme but also to use the close form to solve the overflow/ underflow problem.