In object oriented database systems OODB with logical OIDs an OID index OIDX is needed to map from OID to the physical location of the object In a transaction time temporal OODB the OIDX should also index the object versions In this case the index entries which we call object descriptors OD also include the commit timestamp of the transaction that created the object version In this report we de...

BACKGROUND Chronic obstructive pulmonary disease (COPD) is a serious chronic condition with a global impact. Symptoms of COPD include progressive dyspnea, breathlessness, cough, and sputum production, which have a considerable impact on the lives of patients. In addition to the human cost of living with COPD and the resulting death, COPD entails a huge economic burden on the Chinese population,...