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In this paper, we present a framework for experimenting with virtual environments. The architecture of the system VRECKO is designed for the rapid prototyping of techniques for human-computer interaction. The architecture is flexible, but simple. Virtual environment entities and other components can be configured at run time. We demonstrate the flexibility(More)
This paper describes various techniques of accessing objects hidden behind obstacles in virtual environments. We show some of well known interaction techniques that are suitable for usage in this case. Next, we introduce new Head Manipulator method and several aids that allow a user to change the visibility of objects. We propose several combinations of(More)
We present a virtual reality framework (VRECKO) with an editor that is capable of creating new scenes or applications using this framework. The VRECKO system consists of objects with predefined behaviors that an application designer can dynamically change. With instances of a special object type called Ability, we may extend or change behaviors of objects(More)
OBJECTIVE To review a current state of the natural orifice surgery. SUBJECT Review article and case report. SETTING Porodnicko-gynekologická klinika Pardubické krajské nemocnice, a.s. METHOD The analysis of published data and case report. CONCLUSION Natural orifice surgery makes it possible to perform intraperitoneal surgical procedures with a(More)
Anastomotic leakage is one of the most important complications that occur after surgical low anterior resection for rectal cancer. Protective ileostomy or transversostomy is used during rectal resection to reduce the consequences of rectal anastomotic failures. Many studies strictly recommend performing these protective stomies for the reduction of(More)
INTRODUCTION Cannulation v. subclavia is connected with many complications. Haemothorax is occurs approximately in 2% of cases. Surgical revision is indicated immediately if a major blood loss or a circulation insufficiency occur. Surgical treatment of bleeding in cupola of pleural cavity is due to its bad accesability difficult and conventional surgical(More)
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