A sheet-combined thermal-dissipating device has a plurality of thermal-dissipating sheets, which are connected with each other. The DDV system can include fail safe features such as selectively extendable attenuation members for decreasing a falling object’s impact, a normally open back-up valve member for actuation upon failure of a primary valve member, or a locking member to lock a valve member closed and enable disposal of a shock attenuating material on the valve member. A logic synthesis unit performs logic synthesis on the targeted layer with use of the selected library. Furthermore, accessibly offering the open pre-paid card for sale, in one exemplary embodiment, is performed by hanging the pre-paid card on a rack.