The Experts below are selected from a list of 294 Experts worldwide ranked by ideXlab platform
Tek-jin Nam - One of the best experts on this subject based on the ideXlab platform.
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CHI Extended Abstracts - Bendi: Shape-Changing Mobile Device for a Tactile-Visual Phone Conversation
Proceedings of the 33rd Annual ACM Conference Extended Abstracts on Human Factors in Computing Systems, 2015Co-Authors: Young-woo Park, Joohee Park, Tek-jin NamAbstract:We present a shape-changing mobile device, Bendi, which enables tactile-visual interactions in real time during phone conversations. It allows users to generate shape-changing movements such upward or Downward Bending, left or right tilting, and shrinking from the user's joystick input to the other party's device. Bendi is divided into the upper part that represents small and fast movements and the lower part that represents larger movements. We designed that users can have phone conversations with Bendi while holding the device in the hand and wearing an earphone, because this is one of natural phone calling postures.
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CHI - The Trial of Bendi in a Coffeehouse: Use of a Shape-Changing Device for a Tactile-Visual Phone Conversation
Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems, 2015Co-Authors: Young-woo Park, Joohee Park, Tek-jin NamAbstract:We present Bendi, a shape-changing device for a tactile-visual phone conversation. Bendi enables users to deliver shape-changing movements (e.g., upward or Downward Bending, left or right tilting, and shrinking) from the user's joystick input to the other party's device in real time during phone conversations. We conducted a user study to observe how seven couples used it over three days in a coffeehouse. Our field trial of Bendi in a coffeehouse showed the private and natural uses, and integrated uses of tactile and visual expressions along with the uses of the vocabularies developed through Bendi. In addition, there were active uses even in negative and serious conversational context with its pleasant tactile feelings and movement representations. Lastly, we discuss issues for the future designs and real-world deployment of shape-changing mobile devices for daily use.
K Kobayashi - One of the best experts on this subject based on the ideXlab platform.
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Surface and bulk electronic structures of heavily Mg-doped InN epilayer by hard X-ray photoelectron spectroscopy
Journal of Applied Physics, 2017Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K Kobayashi, Ryan G. Banal, Tomohiro YamaguchiAbstract:To evaluate the polarity, energy band diagram, and oxygen (O) distribution of a heavily Mg-doped InN (InN:Mg+) epilayer with a Mg concentration of 1.0 ± 0.5 × 1020 cm−3, the core-level and valence band (VB) photoelectron spectra are investigated by angle-resolved soft and hard X-ray photoelectron spectroscopies. The InN:Mg+ epilayers are grown by radio-frequency plasma-assisted molecular beam epitaxy. In this doping level, the polarity inversion from In-polar to N-polar occurs with the increase in the Mg flow rate under the same growth conditions, and the VB spectrum clearly indicates the direction of polarity of InN:Mg+, which is N-polar. The energy band diagram is considered to exhibit a two-step Downward Bending structure due to the coexistence of the n+ surface electron accumulation layer and heavily Mg-doped p+ layer formed in the bulk. The O concentration rapidly increases until ∼4 nm with respect to the surface, which is deduced to be one of the reasons of the formation of the anomalous two-step en...
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impact of mg concentration on energy band depth profile of mg doped inn epilayers analyzed by hard x ray photoelectron spectroscopy
Applied Physics Letters, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The electronic structures of Mg-doped InN (Mg-InN) epilayers with the Mg concentration, [Mg], ranging from 1 × 1019 to 5 × 1019 cm−3 were systematically investigated by soft and hard X-ray photoelectron spectroscopies. The angle-resolved results on the core-level and valence band photoelectron spectra as a function of [Mg] revealed that the energy band of Mg-InN showed Downward Bending due to the n+ surface electron accumulation and p type layers formed in the bulk. With an increase in [Mg], the energy-band changed from monotonic to two-step n+p homojunction structures. The oxygen concentration rapidly increased at the middle-bulk region (∼4.5 to ∼7.5 nm) from the surface, which was one of the reasons of the transformation of two-step energy band.
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systematic investigation of surface and bulk electronic structure of undoped in polar inn epilayers by hard x ray photoelectron spectroscopy
Journal of Applied Physics, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The surface and bulk electronic structure of undoped In-polar InN (u-InN) epilayers with surface electron accumulation (SEA) layer was investigated by soft and hard X-ray photoelectron spectroscopies (SX-PES and HX-PES, respectively). The potential-energy profile was obtained by fitting the N 1s core-level spectra accounting for the probing depth of both SX-PES and HX-PES and the surface Downward band Bending. In this study, we found that a significant potential-energy Bending as large as 1.2 ± 0.05 eV occurred from surface to the depth of ∼20 nm. Taking into account such a large Downward Bending, the valence band maximum (VBM) with respect to Fermi energy (EF) level in the bulk was determined to be 0.75 ± 0.05 eV. A weak signal with a peak position at 0.3 ± 0.05 eV was reproducibly observed from the VBM to EF level in the HX-PES spectrum. The peak position was in agreement with the calculated energy of the E1 sub-band in the surface quantum well. HX-PES is powerful tool for revealing the intrinsic bulk e...
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systematic investigation of surface and bulk electronic structure of undoped in polar inn epilayers by hard x ray photoelectron spectroscopy
Journal of Applied Physics, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The surface and bulk electronic structure of undoped In-polar InN (u-InN) epilayers with surface electron accumulation (SEA) layer was investigated by soft and hard X-ray photoelectron spectroscopies (SX-PES and HX-PES, respectively). The potential-energy profile was obtained by fitting the N 1s core-level spectra accounting for the probing depth of both SX-PES and HX-PES and the surface Downward band Bending. In this study, we found that a significant potential-energy Bending as large as 1.2 ± 0.05 eV occurred from surface to the depth of ∼20 nm. Taking into account such a large Downward Bending, the valence band maximum (VBM) with respect to Fermi energy (EF) level in the bulk was determined to be 0.75 ± 0.05 eV. A weak signal with a peak position at 0.3 ± 0.05 eV was reproducibly observed from the VBM to EF level in the HX-PES spectrum. The peak position was in agreement with the calculated energy of the E1 sub-band in the surface quantum well. HX-PES is powerful tool for revealing the intrinsic bulk electronic structure of materials with large potential-energy Bending. This work provides important information for the future investigation of electronic structures of undoped and Mg-doped InGaN, as well as Mg-doped InN epilayers with a SEA layer similar to u-InN.
Young-woo Park - One of the best experts on this subject based on the ideXlab platform.
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CHI Extended Abstracts - Bendi: Shape-Changing Mobile Device for a Tactile-Visual Phone Conversation
Proceedings of the 33rd Annual ACM Conference Extended Abstracts on Human Factors in Computing Systems, 2015Co-Authors: Young-woo Park, Joohee Park, Tek-jin NamAbstract:We present a shape-changing mobile device, Bendi, which enables tactile-visual interactions in real time during phone conversations. It allows users to generate shape-changing movements such upward or Downward Bending, left or right tilting, and shrinking from the user's joystick input to the other party's device. Bendi is divided into the upper part that represents small and fast movements and the lower part that represents larger movements. We designed that users can have phone conversations with Bendi while holding the device in the hand and wearing an earphone, because this is one of natural phone calling postures.
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CHI - The Trial of Bendi in a Coffeehouse: Use of a Shape-Changing Device for a Tactile-Visual Phone Conversation
Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems, 2015Co-Authors: Young-woo Park, Joohee Park, Tek-jin NamAbstract:We present Bendi, a shape-changing device for a tactile-visual phone conversation. Bendi enables users to deliver shape-changing movements (e.g., upward or Downward Bending, left or right tilting, and shrinking) from the user's joystick input to the other party's device in real time during phone conversations. We conducted a user study to observe how seven couples used it over three days in a coffeehouse. Our field trial of Bendi in a coffeehouse showed the private and natural uses, and integrated uses of tactile and visual expressions along with the uses of the vocabularies developed through Bendi. In addition, there were active uses even in negative and serious conversational context with its pleasant tactile feelings and movement representations. Lastly, we discuss issues for the future designs and real-world deployment of shape-changing mobile devices for daily use.
Masataka Imura - One of the best experts on this subject based on the ideXlab platform.
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Surface and bulk electronic structures of heavily Mg-doped InN epilayer by hard X-ray photoelectron spectroscopy
Journal of Applied Physics, 2017Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K Kobayashi, Ryan G. Banal, Tomohiro YamaguchiAbstract:To evaluate the polarity, energy band diagram, and oxygen (O) distribution of a heavily Mg-doped InN (InN:Mg+) epilayer with a Mg concentration of 1.0 ± 0.5 × 1020 cm−3, the core-level and valence band (VB) photoelectron spectra are investigated by angle-resolved soft and hard X-ray photoelectron spectroscopies. The InN:Mg+ epilayers are grown by radio-frequency plasma-assisted molecular beam epitaxy. In this doping level, the polarity inversion from In-polar to N-polar occurs with the increase in the Mg flow rate under the same growth conditions, and the VB spectrum clearly indicates the direction of polarity of InN:Mg+, which is N-polar. The energy band diagram is considered to exhibit a two-step Downward Bending structure due to the coexistence of the n+ surface electron accumulation layer and heavily Mg-doped p+ layer formed in the bulk. The O concentration rapidly increases until ∼4 nm with respect to the surface, which is deduced to be one of the reasons of the formation of the anomalous two-step en...
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impact of mg concentration on energy band depth profile of mg doped inn epilayers analyzed by hard x ray photoelectron spectroscopy
Applied Physics Letters, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The electronic structures of Mg-doped InN (Mg-InN) epilayers with the Mg concentration, [Mg], ranging from 1 × 1019 to 5 × 1019 cm−3 were systematically investigated by soft and hard X-ray photoelectron spectroscopies. The angle-resolved results on the core-level and valence band photoelectron spectra as a function of [Mg] revealed that the energy band of Mg-InN showed Downward Bending due to the n+ surface electron accumulation and p type layers formed in the bulk. With an increase in [Mg], the energy-band changed from monotonic to two-step n+p homojunction structures. The oxygen concentration rapidly increased at the middle-bulk region (∼4.5 to ∼7.5 nm) from the surface, which was one of the reasons of the transformation of two-step energy band.
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systematic investigation of surface and bulk electronic structure of undoped in polar inn epilayers by hard x ray photoelectron spectroscopy
Journal of Applied Physics, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The surface and bulk electronic structure of undoped In-polar InN (u-InN) epilayers with surface electron accumulation (SEA) layer was investigated by soft and hard X-ray photoelectron spectroscopies (SX-PES and HX-PES, respectively). The potential-energy profile was obtained by fitting the N 1s core-level spectra accounting for the probing depth of both SX-PES and HX-PES and the surface Downward band Bending. In this study, we found that a significant potential-energy Bending as large as 1.2 ± 0.05 eV occurred from surface to the depth of ∼20 nm. Taking into account such a large Downward Bending, the valence band maximum (VBM) with respect to Fermi energy (EF) level in the bulk was determined to be 0.75 ± 0.05 eV. A weak signal with a peak position at 0.3 ± 0.05 eV was reproducibly observed from the VBM to EF level in the HX-PES spectrum. The peak position was in agreement with the calculated energy of the E1 sub-band in the surface quantum well. HX-PES is powerful tool for revealing the intrinsic bulk e...
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systematic investigation of surface and bulk electronic structure of undoped in polar inn epilayers by hard x ray photoelectron spectroscopy
Journal of Applied Physics, 2013Co-Authors: Masataka Imura, Shunsuke Tsuda, Takahiro Nagata, Hiroyuki Takeda, Meiyong Liao, Anli Yang, Yoshiyuki Yamashita, Hideki Yoshikawa, Yasuo Koide, K KobayashiAbstract:The surface and bulk electronic structure of undoped In-polar InN (u-InN) epilayers with surface electron accumulation (SEA) layer was investigated by soft and hard X-ray photoelectron spectroscopies (SX-PES and HX-PES, respectively). The potential-energy profile was obtained by fitting the N 1s core-level spectra accounting for the probing depth of both SX-PES and HX-PES and the surface Downward band Bending. In this study, we found that a significant potential-energy Bending as large as 1.2 ± 0.05 eV occurred from surface to the depth of ∼20 nm. Taking into account such a large Downward Bending, the valence band maximum (VBM) with respect to Fermi energy (EF) level in the bulk was determined to be 0.75 ± 0.05 eV. A weak signal with a peak position at 0.3 ± 0.05 eV was reproducibly observed from the VBM to EF level in the HX-PES spectrum. The peak position was in agreement with the calculated energy of the E1 sub-band in the surface quantum well. HX-PES is powerful tool for revealing the intrinsic bulk electronic structure of materials with large potential-energy Bending. This work provides important information for the future investigation of electronic structures of undoped and Mg-doped InGaN, as well as Mg-doped InN epilayers with a SEA layer similar to u-InN.
Daniel S Mojon - One of the best experts on this subject based on the ideXlab platform.
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intermittent visual loss and exophthalmos due to the blue rubber bleb nevus syndrome
American Journal of Ophthalmology, 2001Co-Authors: Angela Sobottka C Ventura, Luca Remonda, Daniel S MojonAbstract:Abstract PURPOSE: To describe the occurrence of intermittent visual loss in a patient with orbital hemangioma due to the blue rubber bleb nevus syndrome. METHODS: Case report. RESULTS: A 70-year-old woman complained of intermittent blurred vision combined with pressure behind her left eye occurring after head Bending or Valsalva maneuvers. Examination revealed 2 mm of enophthalmos on the left. After Downward Bending of the head the eye became exophthalmic by 12 mm and visual acuity decreased to finger counting. Neuro-ophthalmologic examination was otherwise normal. Magnetic resonance imaging revealed an intraconal hemangioma. Bluish, soft, rubber-like, compressible and slowly refilling hemangiomas on the inferior lip, sublingually, on the hand, and vagina led to the diagnosis of BRBNS. CONCLUSIONS: Intermittent visual loss may be the presenting symptom of an orbital hemangioma in BRBNS. Recognition of this rare condition is important because of its potentially life-threatening complications.