Security in Process: Detecting Attacks in Industrial Process Data

Due to the fourth industrial revolution, industrial applications make use of the progress in communication and embedded devices. This allows industrial users to increase efficiency and manageability while reducing cost and effort. Furthermore, the fourth industrial revolution, creating the so-called Industry 4.0, opens a variety of novel use and business cases in the industrial environment. However, this progress comes at the cost of an enlarged attack surface of industrial companies. Operational networks that have previously been phyiscally separated from public networks are now connected in order to make use of new communication capabilites. This motivates the need for industrial intrusion detection solutions that are compatible to the long-term operation machines in industry as well as the heterogeneous and fast-changing networks. In this work, process data is analysed. The data is created and monitored on real-world hardware. After a set up phase, attacks are introduced into the systems that influence the process behaviour. A time series-based anomaly detection approach, the Matrix Profiles, are adapted to the specific needs and applied to the intrusion detection. The results indicate an applicability of these methods to detect attacks in the process behaviour. Furthermore, they are easily integrated into existing process environments. Additionally, one-class classifiers One-Class Support Vector Machines and Isolation Forest are applied to the data without a notion of timing. While Matrix Profiles perform well in terms of creating and visualising results, the one-class classifiers perform poorly

Meta-analysis of endoscopy and surgery versus surgery alone for common bile duct stones with the gallbladder in situ

Background: There is no clear consensus on the better therapeutic approach (endoscopic versus surgical) to choledocholithiasis. This study is a meta-analysis of the available evidence. Methods: A search of the Medline and ISI databases identified 12 studies that met the inclusion criteria for data extraction. The analysis was performed using a random-effects model. The outcome was calculated as an odds ratio (OR) or relative risk (RR) with 95 per cent confidence intervals (c.i.). Results: Outcomes of 1357 patients were studied. There was no significant difference in successful duct clearance (OR 0.85 (95 per cent c.i. 0.64 to 1.12); P = 0.250), mortality (RR 1.79 (95 per cent c.i. 0.66 to 4.83); P = 0.250), total morbidity (RR 0.89 (95 per cent 0.71 c.i. to 1.13); P = 0.350), major morbidity (RR 1.34 (95 per cent c.i. 0.92 to 1.97); P = 0.130) or need for additional procedures (OR 1.37 (95 per cent c.i. 0.82 to 2.29); P = 0.230) between the endoscopic and surgical groups. There was also no significant difference between the endoscopic and laparoscopic surgery groups. Conclusion: Both approaches have similar outcomes, and treatment should be determined by local resources and expertise

Laparoscopic fenestration for the treatment of patients with severe adult polycystic liver disease

Background: The purpose of this study was to present our experience in laparoscopic fenestration for patients with severe symptomatic adult polycystic liver disease (APLD), analyze its feasibility, and evaluate its immediate and mid-term outcome. Methods: Between January 2000 and January 2002, 9 patients underwent laparoscopic fenestration for symptomatic APLD in our laparoendoscopic unit. All patients had both liver lobes affected with Multiple cysts, whereas type If disease (present in 8 patients) was not a contraindication for the procedure. The results were retrospectively evaluated. Results: Conversion to laparotomy was required in 1 patient who was submitted to a second laparoscopic procedure (2 years postoperatively) after being admitted to our department with sepsis. Complete regression of symptoms was achieved in 7 of our patients (77.8 %). One death occurred because of acute renal failure established 5 weeks after the patient was discharged. During a mean follow-up of 25.8 months, 2 patients presented with recurrence of their symptoms (22.2 %). One of them was reoperated on; both of them remain symptom free 14 months postoperatively. Conclusions: Laparoscopic fenestration appears to be a useful and effective approach for severe APLD. It is associated with short hospital stay and a significant symptom-free period. Despite the reported morbidity, aggressive and meticulous deroofing of as many cysts as possible can be successfully applied for carefully Selected patients with type II disease. (C) 2005 Excerpta Medica Inc. All rights reserved