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김혜진,변춘원,김성은,이정익,Kim, H.J.,Byun, C.W.,Kim, S.E.,Lee, J.I. 한국전자통신연구원 2018 전자통신동향분석 Vol.33 No.6
Sensory devices have been developed to help people with disabled or weakened sensory functions. Such devices play a role in collecting and transferring data for the five senses (vision, sound, smell, taste, and tactility) and also stimulating nerves. To provide brain or prosthesis devices with more sophisticated senses, hyper sensory devices with a high resolution comparable to or even better than the human system based on individual neuron cells are essential. As for data collecting components, technologies for sensors with higher resolution and sensitivity, and the conversion of algorithms from physical sensing data to human neuron signals, are needed. Converted data can be transferred to neurons that are responsible for human senses through communication with high security, and neural interfaces with high resolution. When communication deals with human data, security is the most important consideration, and intra-body communication is expected to be a candidate with high priority. To generate sophisticated human senses by modulating neurons, neural interfaces should modulate individual neurons, and therefore a high resolution compared to human neurons (~ several tens of um) with a large area covering neuron cells for human senses (~ several tens of mm) should be developed. The technological challenges for developing sensory devices with human and even beyond-human capabilities have been tackled by various research groups, the details of which are described in this paper.
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천경아,변재영,이재문,하현권,김현,박영하,김일순,김종우,박용휘,신경섭,Chun, Kyung-Ah,Byun, Jae-Young,Lee, Jae-Mun,Ha, Hyun-Kwon,Kim, Hyun,Park, Young-Ha,Kim, Il-Sun,Kim, Jong-Woo,Bahk, Yong-Whee,Shinn, Kyung-Sub 대한영상의학회 1993 대한영상의학회지 Vol.29 No.2
Adult intussusception is a rare condition, unlike in children. There is an identifiable bowel lesion as a leading point in most of cases. Retrospectively we reviewed 22 patients with adult intussusception, and analyzed CT scans of 13 patients during the last 5 years. Twenty of the 22 patients had various causes of intussusception and 7 patients were as sociated with primary malignancy, 5 patients with benign tumor, and 4 patients with adhesive band. CT scans of 13 cases all showed characteristic target appearance or sausage-like soft tissue mass within the bowel, suggesting intussusception. In eleven of the 13 patients(84.6%) an intussuscepting mass was identified on CT scan as the lead point. Specific diagnosis for the cause of intussusception could be made by CT in four of 13 cases (three lipomas and one mucocle). In conclusion. CT is useful not only for the diagnosis but also for the evaluation of the leading causes of intussusception. Especially, CT could determined the exact causes of intussusception in cases of lipoma and mucocele.
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A Fully Integrated Dual-Band WLP CMOS Power Amplifier for 802.11n WLAN Applications
Seungjun Baek,Hyunjin Ahn,Hyunsik Ryu,Ilku Nam,Deokgi An,Doo-Hyouk Choi,Mun-Sub Byun,Minsu Jeong,Bo-Eun Kim,Ockgoo Lee 한국전자파학회JEES 2017 Journal of Electromagnetic Engineering and Science Vol.17 No.1
A fully integrated dual-band CMOS power amplifier (PA) is developed for 802.11n WLAN applications using wafer-level package (WLP) technology. This paper presents a detailed design for the optimal impedance of dual-band PA (2 GHz/5 GHz PA) output transformers with low loss, which is provided by using 2:2 and 2:1 output transformers for the 2 GHz PA and the 5 GHz PA, respectively. In addition, several design issues in the dual-band PA design using WLP technology are addressed, and a design method is proposed. All considerations for the design of dual-band WLP PA are fully reflected in the design procedure. The 2 GHz WLP CMOS PA produces a saturated power of 26.3 dBm with a peak power-added efficiency (PAE) of 32.9%. The 5 GHz WLP CMOS PA produces a saturated power of 24.7 dBm with a PAE of 22.2%. The PA is tested using an 802.11n signal, which satisfies the stringent error vector magnitude (EVM) and mask requirements. It achieved an EVM of -28 dB at an output power of 19.5 dBm with a PAE of 13.1% at 2.45 GHz and an EVM of -28 dB at an output power of 18.1 dBm with a PAE of 8.9% at 5.8 GHz.
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