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An abstract of the article "Single-machine learning effect scheduling jobs with release time" by Wang Ji-bo and colleagues is presented.

The single-machine slack due date scheduling problem with deteriorating jobs is researched, where the deterioration effect means that the actual processing time of jobs is defined as increasing function of their starting time and the deteriorating rates of all jobs are identical, and due date of the job is equal to its actual processing time plus the common slack time. The objective is to determine the optimal scheduling and the common slack time simultaneously to minimize the sum of earliness, tardiness and common slack. time. It is proved that the problem can be transformed into the product of two vectors by the operations research method, thus can be solved in polynomial time, and the optimal algorithm to solve the problem is given. [ABSTRACT FROM AUTHOR]

Objective: To study a population of rheumatoid arthritis patients and determine the extent of periodontal disease in these patients, in order to investigate the relationship between periodontal disease and rheumatoid arthritis., Methods: The experimental group was composed of 70 patients with rheumatoid arthritis and the control group consisted of 70 age- and gender-matched individuals without rheumatoid arthritis. The relationship between periodontal status in rheumatoid arthritis and control groups as well as the relationship between periodontal status and rheumatological findings in patients were analyzed., Results: The percentage of periodontal disease was statistically significant between experimental and control group (P < 0.01). The difference of average number of missing teeth and bleeding on probing in the experimental group and control group were not statistically significant (P >0.05). There were more number of periodontal disease index 5 or 6 in experimental group than in control group ( P < 0.05). Rheumatoid arthritis patients with moderate to severe bone loss had deeper degree of morning stiffness, erythrocyte sedimentation rate levels and serum C-reactive protein levels than patients with no or mild bone loss., Conclusion: Individuals with rheumatoid arthritis are more likely to experience periodontal disease compares to healthy subjects. They are also very likely to suffer from moderate to severe periodontitis.