Techniques for malware detection are described herein. The vertical movement of the upper tray is assured by an assembly of screw jacks, plates, guides and runners. The control unit includes an assist calculating unit that differentiates a signal of the steering torque, adds the differentiated value to the steering assist command value, and continuously changes the differential gain according to the steering torque and the size of the vehicle speed. The target is the selectively illuminated using an illumination device, according to the illumination figure. Active devices, such as transistors and diodes, can be formed in the semiconductor layer.