Extensive efforts have been made in the research and development of smart textile systems in recent years. One of these developments in smart materials is shape memory applications. Shape memory materials (SMM) are smart materials that can remember and recover substantial programmed deformation upon activation and exposing to an external stimulus such as chemicals, temperature, pH, light, a magnetic field, etc. Shape memory materials have been used in many areas and textile application of this technology has covered a wide usage recently. Today's textile concept isn't the similar to past and expectations of people from textile have been changing more and more. In this point, shape memory materials can answer these needs in textile due to its smart features. Shape-memory materials can be used in textile as clothing, yarn and fabric. The application possibilities are only limited by our imagination and creativity, so shape-memory productions have been able to gain a different aspect to textile.

In present study, electronic vests were designed by using conductive textile material and electronic circuits. The objective was to sense armed assaults and transmit the coordinates and position of gun fire instantly to the headquarters. Another objective is to provide instant emergency respond for injuries at vital sections of the body and to capture perpetrators quickly. To reach the desired targets, silver-coated conductive yarn, polyamide plain weave and various circuit components were used. Silver-coated conductive yarn was used to form sensor unit of the electronic vest and stitched over polyamide fabric in 3 mm intervals. Main vest section was prepared in medium size and conductive-yarn sensor unit was installed to the vest with a velcro system. Classical and Surface Mount Device (SMD) circuit technologies were used in circuit units to sense bullet intrusion and transmit the case to operational center. Two different circuit designs were tested at a shooting range and the outcomes were assessed and compared for two different circuits. It was observed in shooting tests that both vests were able to sense bullet intrusions in case of an assault and to transmit the shot message with the coordinates and position of the shoot correctly.

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It has been seen great advances in technology in recent years. One of these advances has become in smart textile. Although there are many different definitions, usually smart textiles can be defined "sense and respond to environmental stimuli". They have been different application areas such as e-textiles, nano textiles, technical textiles, etc. In the last decades, e-textiles developments come to the fore in the smart textiles. E-textiles contain some digital, electronical circuits, sensors and textile based materials such as conductive fiber, yarn and fabrics. A lot of products can be made in this industry but the effects of environmental stimulis such as human perspiring on these products are not examined so much. In this study, it was examined the conductivity of e-textile fabrics in the changing different pH values according to gender. Acidic and alkaline solutions have been applied on conductive fabrics and results have been examined with SEM and resistance measure. As a result of the study, it is found that perspiration doesn't affect the conductivity on conductive textile surface badly. In contrast, conductivity has the better result when perspiration solution used. Conductivity increased for each pattern and pH solutions because of decreasing resistance.

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