[show abstract][hide abstract] ABSTRACT: Effective data management is crucial for interactive multimedia applications due to the large amount of data that need to be processed on-line. When the size of a 3D virtual world is larger than the available physical memory of a display client, we need to proactively maintain useful data in the memory for immediate or future graphics rendering. Traditional page-based data management scheme becomes insufficient for applications with strong spatial and temporal coherence. In this paper we describe a 3D navigation system for visualizing large virtual environments. In the system we propose novel data management techniques based on discrete visibility precomputation, hybrid cache model, and prioritized spatial prefetching. Our preliminary experimental results show that these techniques can improve response time and navigation smoothness. 1. Introduction Interactive 3D graphics were only possible on expensive workstations equipped with special graphics hardware a few years ago. However, a...
[show abstract][hide abstract] ABSTRACT: Medical tourism is a relatively recent global economic and political phenomenon that has assumed increasing importance for developing countries, particularly in Asia. In fact, Taiwan possesses a niche for developing medical tourism because many hospitals provide state-of-the-art medicine in all disciplines and many doctors are trained in the United States (US). Among the most common medical procedures outsourced, joint replacements such as total knee replacement (TKR) and total hip replacement (THR) are two surgeries offered to US patients at a lower cost and shorter waiting time than in the US.
This paper proposed a pre-checking medical tourism system (PCMTS) and evaluated the cost feasibility of recruiting American clients traveling to Taiwan for joint replacement surgery. Cost analysis was used to estimate the prime costs for each stage in the proposed PCMTS. Sensitivity analysis was implemented to examine how different pricings for medical checking and a surgical operation (MC&SO) and recovery, can influence the surplus per patient considering the PCMTS. Finally, the break-even method was adopted to test the tradeoff between the sunk costs of investment in the PCMTS and the annual surplus for participating hospitals.
A novel business plan was built showing that pre-checking stations in medical tourism can provide post-operative care and recovery follow-up. Adjustable pricing for hospital administrators engaged in the PCMTS consisted of two main costs: US$3,700 for MC&SO and US$120 for the hospital stay. Guidelines for pricing were provided to maximize the annual surplus from this plan with different number of patients participating in PCMTS. The maximal profit margin from each American patient undertaking joint surgery is about US$24,315.
Using cost analysis, this article might be the first to evaluate the feasibility of PCMTS for joint replacement surgeries. The research framework in this article is applicable when hospital administrators evaluate the feasibility of outsourced medical procedures other than TKR and THR.
[show abstract][hide abstract] ABSTRACT: The meniscus plays a key role in the functioning of the knee. At the present time, meniscal repair has becomes the main treatment for meniscal tear. Compared to open surgery, arthroscopic meniscal repair has become popular because of shorter time need for the operation, the smaller wound, and better accessibility to the tear portion, which is particularly difficult during open surgery. Three arthroscopic techniques are widely used, namely inside-out, outside-in, and all-inside. Arthroscopy all inside meniscal repair has the lowest neurovascular injury rate.
This study prospectively evaluated 31 consecutively treated patients to determine the effectiveness/safety of arthroscopic meniscal repair using the FasTFix repair system. The inclusion criteria for this study were: vertical fullthickness tear> 10 mm in length; location of the meniscal tear < 6 mm from the meniscocapsular junction; repair of the meniscus solely with the FasTFix system; no former meniscus surgery; and no evidence of arthritis during arthroscopy. Anterior cruciate ligament (ACL) deficient knees were reconstructed using a hamstring autograft at the time of the meniscal repair. Follow-up examinations consisted of Lysholm knee score, Tegner activity score and radiographic evaluation.
After an average of 3 years follow-up, no symptoms of meniscal tears were found in 30/31 of the cases. For patients with isolated meniscal repair or concurrent ACL reconstruction, the Lysholm and Tegner activity scores had significantly improved postoperatively. No neurovascular or other major complications were directly associated with the use of the device.
Arthroscopic all-inside repair using the FasT-Fix device appears to be a safe and effective procedure.