1,721,089 research outputs found
Complications after liver surgery
Full text linkLecture: Two decades ago, mortality rates after hepatectomy had been reported approximately 9% to 20% or more. Advances in appropriate patient selection, operative and anesthetic techniques, and perioperative care have reduced the risk of mortality less than 3%. In contrast, morbidity rate still remains high, ranges from 20% to 56%, depending on the patient condition, the extent of resection, the remnant liver functional reserve, the underlying liver disease, and the surgical skill. Operation on the liver is especially challenging because of its unique anatomic architecture and its vital functions. Various post-hepatectomy complications could occur such as post-hepatectomy liver failure, postoperative hemorrhage, bile leakage, ascites, pleural effusion, pulmonary atelectasis or infection, venous thromboembolism, and surgical site infection. These problems are closely related to preoperative evaluation and preparation, surgical and anesthetic technique, and postoperative monitoring and management. Currently, the liver surgeons are increasingly performing complex operations with more extended resections and more repeat hepatectomies on an aging population with multiple comorbidities and heavily pretreated or hepatitis-damaged livers. A well-designed, individualized management approach based on patient’s overall condition and liver function is vital to reduce post-hepatectomy complications and to achieve optimal outcomes. This presentation would introduce type of complications after liver resection and its management
Exploiting intellectual properties with imprecise design costs for system-on-chip synthesis
No full textThis paper presents an intellectual property (IP)-based system-on-chip (SoC) synthesis framework focusing on how to select IN from different sources and how to integrate the selected IN using on-chip buses. In order to synthesize an on-chip bus-based SoC architecture using IN with imprecise design costs, we propose a possibilistic mixed integer linear programming (PMILP) model, which is converted into an equivalent mixed integer linear programming (MILP) model without increasing the computational complexity. Then, the equivalent MILP model is solved to decide whether each IP is selected or not, and to locate the selected IP on the optimal on-chip bus of a hierarchical bus architecture that consists of on-chip buses with different bus attributes. Experimental results on an MP3 decoding system show that the IP-centric design space with uncertainty can be successfully explored using the proposed scheme
An optical code with the least multiple access interference under arbitrary restrictions for optical CDMA systems
No full textThis work was
supported in part by KOSEF through OIRC
Selection of Safe Donors for Living Donor Liver Transplant Using Extended Right Lobe Graft
No full textExtended right lobectomy (ERL) for living donor liver transplant (LDLT) is selectively performed in many transplant centers and has shown excellent recipient outcomes as reported in previous studies. Yet, there is no universally accepted indication for ERL in respect to donor safety. Current study was designed to stratify risk factors of adverse donor outcome after ERL. A total of 79 living donors who underwent ERL for LDLT were included in analysis. Donors were classified as safety and hazard donor groups according to postoperative findings relevant to posthepatectomy liver failure classification by the International Study Group for Liver Surgery. On multivariable analysis, left lateral section volume <20% of total liver volume and nonpreservation of segment 4a venous drainage were the independent risk factors impairing postoperative outcomes. Despite the short-term impairment of liver function in hazard donor groups, all donors recovered and showed satisfactory remnant liver regeneration. However, these findings have implications in establishing selection criteria of donors eligible for ERL donation. In conclusion, LDLT using ERL graft can be safely performed provided so that left lateral section volume/total donor liver is ≥20% besides conventional donor selection criteria. Also, efforts to preserve segment 4a vein must be made in performing ERL graft procurement in LDLT donors
Dynamic analysis of structures using modified Lanczos co-ordinates
No full textAn efficient dynamic analysis method using the modified Lanczos co-ordinates is presented. The proposed method is obtained by applying the modified Lanczos algorithm using Lanczos vectors that satisfy the stiffness-orthonormality condition to the conventional Lanczos co-ordinates method. The modified Lanczos co-ordinates method is more efficient than the conventional method in the case of structures under multi-input loads. The effectiveness of the modified Lanczos co-ordinates method is verified by analysing a numerical example. Copyright (C) 2003 John Wiley Sons, Ltd
Shielding effectiveness of enclosure with thick multiple apertures
No full textThis letter shows a method for approximately calculating the shielding effectiveness of a rectangular enclosure with thick multiple apertures. Numerical results illustrate the shielding effectiveness of the enclosure with various thicknesses and aperture spacings. This method is reasonably accurate up to 2 / 3 of the cutoff frequency associated with the longer aperture dimension. (C) 2001 John Wiley & Sons. Inc
Fabrication and analysis of chirped fiber Bragg gratings by thermal diffusion
No full textWe propose and demonstrate a fabrication method of chirped fiber gratings by a thermal diffusion process. The method could suggest a direction for a simple and cost-effective implementation of chirped fiber grating-based devices
Strategy for Selective Middle Hepatic Vein Reconstruction in Living Donor Liver Transplantation Using Right Lobe Graft: A Retrospective Observational Study
No full textBackground: The aim of this study was to verify the safety and feasibility of our selection criteria for middle hepatic vein (MHV) reconstruction in living donor liver transplantation (LDLT) using right lobe grafts. Methods: A total of 153 LDLTs were performed using right lobe grafts in a tertiary hospital from 2006 to 2016. Among them, 52 cases without MHV reconstruction were compared with 101 recipients who underwent LDLT using right lobe graft with MHV reconstruction. Both groups were compared regarding indications for reconstruction, short-term and long-term complications, operative details, and outcomes. Results: The two groups differed only in cold ischemic time (108.19 ± 49.81 minutes vs 146.37 ± 58.74 minutes) preoperatively. Short-term posttransplant outcomes, long-term overall survival, and long-term disease-free survival showed no significant differences between the 2 groups. After propensity score matching for both groups with and without MHV reconstruction to eliminate selection bias, the 2 groups were comparable. Conclusions: We found that our selection criteria for performing MHV reconstruction in LDLT using right lobe graft were feasible and safe. A routine MHV reconstruction is not necessary if the right lobe graft graft-to-recipient weight ratio is ≥1.0, right hepatic vein draining territory volume is ≥0.8, and recipient Model for End-Stage Liver Disease score is <20
Going Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
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