Hiroyuki Hakoda

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We show a back-of-device (BoD) interaction based on the range of motion of the index finger to improve the usability of a touchscreen mobile device held in one hand. To design this interaction, we conducted two experiments to investigate the range of motion of the index finger on the back of mobile devices. On the basis of those results, we designed a(More)
BACKGROUND Recently, gastrointestinal stromal tumors that have developed outside of the digestive tract have been reported. These tumors are collectively termed extra-gastrointestinal stromal tumors. Extra-gastrointestinal stromal tumors can also develop in the liver. Only eight case reports involving primary GIST of the liver have been published. We report(More)
Virtual reality (VR) using head-mounted displays (HMDs) is becoming popular. Smartphone-based HMDs (SbHMDs) are so low cost that users can easily experience VR. Unfortunately, their input modality is quite limited. We propose a real-time eye tracking technique that uses the built-in front facing camera to capture the user's eye. It realizes stand-alone(More)
BACKGROUND Larger insulinomas are reportedly more likely to be malignant; however, their biological behavior has not been clearly elucidated. We here report the characteristics and treatment of a giant insulinoma with local invasion and lymph node metastasis. We also review published reports concerning the clinical features of giant insulinomas and(More)
We present CamTrackPoint, a new input interface that can be controlled by index finger gestures captured by the rear camera of a mobile device. CamTrackPoint mounts a 3D-printed ring on the rear camera's bezel, and it senses the movement of the user's finger by tracking the light passed through the finger. The proposed method provides mobile devices with a(More)
The authors propose an operating method for multi-touch environments based on a metaphor of the table manners of Western dishes. The user holds two styli, or uses two fingers, as a knife and fork, for operation. The fork plays a role of pointing and selection and the knife plays a role of executing a command. The actions are organized based on table manners(More)
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