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In our contemporary living environment, most people want, not only to maintain privacy and security, but also to avoid losing the keys or passwords for their doors at home. Additionally, many would like to own a fast, convenient and cost-effective exclusive door lock controller to establish some peace of mind. For this paper, the author has designed a smart door lock device which has a non-contact pattern recognition controller to recognize a tiny pattern that can be displayed by mobile devices. The paper aims to discuss this issue.

The patterns recognized by the exclusively designed security device are created using a two-dimensional text and graphics method that can be stored by mobile devices. Therefore, when key-owners come near their doors’ control panels, the established two-dimensional text and graphics cyphers can be displayed for verification purposes on a mobile device’s screen. The author used the MT19937 (32 bit) virtual random number generator as the encryption technology.

The recognized pattern is built using a two-dimensional text and graphics method that can be stored by owners’ mobile devices. Therefore, when a key-owner comes near a door’s control panel, the established two-dimensional text and graphics cypher can be displayed.

Use of either wireless or wired internet causes momentary delays to lock control signals.

Upon each occasion of a code verification, doors are opened and short message service (SMS) notifications are sent to the key-owners simultaneously. The technology described in this paper can be used at any civilian installations that require door lock controls. The application range is very wide and can be customized readily.

The technology discussed here could also be applied widely and easily in various fields.

The lock has a two-phase design for secure opening: i.e. mask-bit enabling and simultaneous SMS notification. The contactless smart door lock system combines three parts that are linked via the internet, which are a cloud server and database, a personal mobile device, and the device’s fixtures and fittings. The fixtures and fittings include a complementary metal oxide silicon sensor, a limiting switch, an electromagnetic switch, a microcontroller unit, and an RJ-45 internet port. The results of this study could be applied at any civilian installation that requires door lock control.

The purpose of this paper is to use personal fuzzy demand, assisted by system computing to find a job, using job search systems to achieve this goal.

The search system uses the fuzzy goal programming (FGP) method by setting personal preferences as property values and screening the data for comparison and calculation. By presenting information sorted by the inputted property values, the methodology suggests the best job options.

FGP algorithms make job-searching systems meet the needs of users better, which can really affect jobseekers’ approaches to pursuing work.

As it has only considered the local cultural environment, this paper’s findings are limited by being confined to Taiwanese samples.

The experimental results of the proposed method have been compared with other websites to show their effectiveness.

This paper has assisted personal decision making using FGP applied to the internet which has seldom been studied previously.