• The Transactions of the Korea Information Processing Society
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• v.1 no.2
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• pp.154-162
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• 1994

In this paper, a new locking protocol which can increase the concurrency in an Object Oriented Database Systems is proposed. The proposed locking protocol uses the Root object identifier to identify the root of a component object in a composite object. The transaction that requests a lock on the component object checks whether the Rid of the component object has been locked by another transaction. Even though the class of the component object is locked by one transaction, other transactions can concurrently access other instances in the class, if each Rid of them is not locked by any other transactions. This can increase the degree of concurrency.

• Journal of Korea Port Economic Association
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• v.34 no.1
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• pp.1-18
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• 2018

Philippines as one of the developing countries in Asia which is compose of more than 7000 islands. Air, Water and Land transportation are the means of travel in the country, however, transportation of goods and services between islands takes place through RoRo ships. There are about 154 RoRo routes connecting the islands in the Philippines and since its establishment, the incomes of the municipalities near the ports have increased by 7%. It is because of the increase of tourist, decrease of cost of transportation and travel time. In order to improve some of the routes in the Philippines, the researcher would like to suggest that the shipping companies should consider to upgrade some vessels. That is to have a vessel with a high-capacity storage for vehicles and goods so that mass transportation made. Another is that the ports need to be upgraded as well.