1,721,225 research outputs found
Drop-on-demand deposition of superheated metal droplets for selective infiltration manufacturing
No full textThe deposition of metal droplets is of great engineering interest because of its practical applications to such various fields as spray forming, surface treatments, and solid freeform fabrication (SFF), etc. The objective of this work is to develop a new drop-on-demand generator of superheated metal droplets that is suitable for the selective infiltration manufacturing (SIM), a new SFF process for the direct fabrication of metal parts. The developed generator comprises a solenoid vibrator, a micro-drilled 130 mum diameter nozzle, an impulse-transmitting rod, and a tubular heating element. A parametric study showed that the diameter of droplets was 301 10 mum when the superheating temperature of Sn-37Pb wt% was set at 260degreesC, 299 +/- 12 mum at 290degreesC, and 301 +/- 12 mum at 320degreesC. Experiments showed that the developed generator is able to deposit superheated metal droplets according to the frequency of the vibrator. (C) 2004 Elsevier B.V. All rights reserved
Fluorescence microscopy is less expensive than Ziehl-Neelsen microscopy in Thailand
No full textZiehl-Neelsen (ZN) microscopy is the primary method for acid-fast bacilli examination in resource-limited settings, including Thailand. Despite its considerably improved diagnostic performance, conventional fluorescent microscopy (FM) is rarely used due to its perceived high cost. An evaluation in Thailand found that the total cost of FM operated in the National Tuberculosis Reference Laboratory (NTRL) in Bangkok, Thailand, is similar to that of ZN performed in the NTRL and in four regional Thai laboratories. FM is therefore a cost-effective alternative to ZN in resource-limited settings.N
Local disparity remapping to enhance depth quality of stereoscopic 3D images using stereoacuity function
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Low household income increases the risk of tuberculosis recurrence: a retrospective nationwide cohort study in South Korea
No full textObjectives: We assessed the impact of household income on tuberculosis (TB) recurrence and the long-term impact of TB on household income. Study design: This was a retrospective nationwide cohort study of patients with drug-susceptible TB (DS-TB) and TB recurrence. Methods: Using the South Korean national TB cohort database, we identified a sub-set cohort of patients with newly diagnosed drug-susceptible TB between 2013 and 2016 and tracked their TB recurrence and longitudinal income data from 2007 to 2018. Income levels were evaluated as Medical aid and quintile categories. To assess risk factors associated with TB recurrence, we used a sub-distribution hazard model, adjusting for the competing risks of death. Results: Of 66,690 patients successfully treated with DS-TB, 2095 (3.1 %) experienced recurrence during a median follow-up of 39 months. The incidence of TB recurrence was 982.1/100,000 person-years, with 50.3 % of the recurrences occurring within 1 year of treatment completion. The risk of TB recurrence increased with decreasing income levels, with the highest risk observed in the lowest income group. The effect of income on TB recurrence was prominent in males but not in females. Overall, patients with TB recurrence experienced a linear decline in income levels, compared with those without recurrence. Conclusions: Household income during the initial TB episode was an important risk factor for TB recurrence, particularly in males.Y
Privacy enhancing solutions for personal information based multimedia content sharing
No full textUser generated content (UGC) is shared in an open space like social media where users can upload and consume contents freely. Since the access to the contents is not restricted, the contents could be delivered to unwanted users or misused sometimes. Although it is contrary to the philosophy of UGC, the contents can be encrypted by a key and the key can be shared among users to protect the contents of a UGC creator. However, it is quite challenging to distribute the key to anonymous users since there is no relationship or acquaintanceship between the content consumers and creators. To solve this problem, user profile or content preference can be utilized. By allowing accessibility to only users who have similar personal information, the contents creator or distributor can select the target group of consumers. In this chapter, we present a method for sharing contents securely based on the personal information of users that includes user profiles and contents preference. With the proposed method, virtual secure space is created for contents delivery. The virtual secure space allows the UGC creator to deliver contents to users who have similar personal information and they can consume the contents without any leakage of personal information during similarity measurement. To realize the virtual secure space, the personal information is applied to fuzzy vault scheme, which enables the generation of secure biometric template. © 2010 Springer-Verlag Berlin Heidelberg
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