17 research outputs found
Switching from Endoscopic Extraperitoneal Radical Prostatectomy to Robot-Assisted Laparoscopic Prostatectomy: Comparing Outcomes and Complications
OBJECTIVE Endoscopic extraperitoneal radical prostatectomy (EERPE) and robot-assisted laparoscopic prostatectomy (RALP) are minimally invasive surgical techniques to treat localized prostate cancer. We report the outcome and complications of these two techniques conducted by one individual surgeon. PATIENTS AND METHODS 86 patients underwent EERPE between January 2008 and June 2011, and 100 patients underwent RALP between August 2011 and October 2012. All surgeries were performed by one single surgeon. RESULTS The patients of the EERPE and RALP groups had similar clinical characteristics in PSA, prostate volume and D'Amico classification, and were significantly different in their age and BMI as well as in the number of prior surgeries. RALP surgeries were significantly slower (183 vs. 157 min) but also involved lower blood loss (147 vs. 245 ml). Pathological stages and positive surgical margins were similar in both groups. Complications were assessed by the Clavien-Dindo classification. 6 patients in the EERPE group and 3 patients of the RALP group suffered major complications (IIIb-IV). CONCLUSION Altogether our results indicate that the learning curve for RALP was short after experience with EERPE. We hypothesize that this is more a result of the surgical experience of the surgeon with the EERPE than on the robotic technique
A microscopic semiclassical confining field equation for lattice gauge theory in 2+1 dimensions
We present a semiclassical nonlinear field equation for the confining field
in 2+1--dimensional lattice gauge theory (compact QED). The equation is
derived directly from the underlying microscopic quantum Hamiltonian by means
of truncation. Its nonlinearities express the dynamic creation of magnetic
monopole currents leading to the confinement of the electric field between two
static electric charges. We solve the equation numerically and show that it can
be interpreted as a London relation in a dual superconductor.Comment: 21 pages, epsf postscript figures included, full postscript available
at ftp://ftp.th.physik.uni-frankfurt.de/pub/cbest/micro.ps.Z or
http://www.th.physik.uni-frankfurt.de/~cbest/pub.htm
5G-NTN GEO-based Over-The-Air Demonstrator using OpenAirInterface
5G services combined with the satellites, also termed 5G NonTerrestrial Networks (5G-NTN), have the capability of
providing connectivity to the areas which were previously
either unreachable or too costly to be reached by terrestrial
communication networks. Proof-of-Concept (POC)
demonstrators, preferably based on open-source
implementation are desirable to expedite the ongoing research
on 5G-NTN. In this work, we discuss the contributions made
during the project 5G-GOA: 5G-Enabled Ground Segment
Technologies Over-The-Air Demonstrator which aims to
provide direct access to 5G services to a UE through a
transparent payload Geostationary (GEO) satellite. 5G-GOA
uses the open-source Software-Defined-Radio (SDR) platform
OpenAirInterface (OAI) and does the necessary adaptations to
achieve its objectives. Adaptations span physical layer
techniques (e.g. synchronization) up to upper layer
implementations (e.g., timers and random-access procedures)
of the Radio Access Network (RAN). The adaptations are
based on 3GPP 5G-NTN discussions and the solutions are
compliant with the recently frozen 3GPP Release-17. An endto-end SDR-based 5G-NTN demonstrator has been developed
for Over-The-Satellite (OTS) testing. We present results from
several experiments that were conducted for in-lab validation
of the demonstrator using a satellite channel emulator before
going live with OTS tests. Experimental results indicate the
readiness of the demonstrator for OTS testing which is
scheduled during ICSSC 2022. The source code has been
submitted to OAI public repository and is available for testing
Mobility in a Globalised World
The term mobility has different meanings in the following academic disciplines. In economics, mobility is the ability of an individual or a group to improve their economic status in relation to income and wealth within their lifetime or between generations. In information systems and computer science, mobility is used for the concept of mobile computing, in which a computer is transported by a person during normal use. Logistics creates, by the design of logistics networks, the infrastructure for the mobility of people and goods. Electric mobility is one of today’s solutions from engineering perspective to reduce the need of energy resources and environmental impact. Moreover, for urban planning, mobility is the crunch question about how to optimize the different needs for mobility and how to link different transportation systems. The conference “Mobility in a Globalised World” took place in Iserlohn, Germany, on September 14th – 15th, 2011. The aim of this conference was to provide an interdisciplinary forum for the exchange of ideas among practitioners, researchers, and government officials regarding the different modes of mobility in a globalised world, focusing on both domestic and international issues. The proceedings at hand document the results of the presentations and ensuing discussions at the conference
A SystemC-Based Design Methodology for Digital Signal Processing Systems
Digital signal processing algorithms are of big importance in many embedded systems. Due to complexity reasons and due to the restrictions imposed on the implementations, new design methodologies are needed. In this paper, we present a SystemC-based solution supporting automatic design space exploration, automatic performance evaluation, as well as automatic system generation for mixed hardware/software solutions mapped onto FPGA-based platforms. Our proposed hardware/software codesign approach is based on a SystemC-based library called SysteMoC that permits the expression of different models of computation well known in the domain of digital signal processing. It combines the advantages of executability and analyzability of many important models of computation that can be expressed in SysteMoC. We will use the example of an MPEG-4 decoder throughout this paper to introduce our novel methodology. Results from a five-dimensional design space exploration and from automatically mapping parts of the MPEG-4 decoder onto a Xilinx FPGA platform will demonstrate the effectiveness of our approach
Determination of telomerase activity for differential analysis of multifocal renal cell carcinomas
Determination of telomerase activity for differential analysis of multifocal renal cell carcinomas. Secondary tumors are found in approximately 12 to 22% of all renal cell carcinoma, and their origin is currently unknown. To determine their potential for malignancy, we examined the telomerase activity of primary tumors and secondary lesions, and found that 86% of the lesions had an identical telomerase status as the related primary tumors, and thus probably share their malignancy potential
Satellite Integration into 5G: Accent on First Over-The-Air Tests of an Edge Node Concept with Integrated Satellite Backhaul
The 5G vision embraces a broad range of applications including the connectivity in underserved and remote areas. In particular, for these applications, satellites are going to play a role in future 5G networks to provide capacity on trains, vessels, aircraft, and for base stations around the globe. In this paper, a 5G edge node concept, developed and evaluated with over-the-air tests using satellites in the geostationary orbit, is presented. The article covers a testbed demonstration study in Europe with a large-scale testbed including satellites and the latest standardization for the network architecture. The main goal of this testbed is to evaluate how satellite networks can be best integrated within the convergent 5G environment. The over-the-air tests for 5G satellite integration in this article are based on a 3GPP Release 15 core network architecture