https://scholar.dgist.ac.kr/handle/20.500.11750/10176 2026-04-06T05:13:50Z https://scholar.dgist.ac.kr/handle/20.500.11750/59016 Title: An Implantable Neural Recording IC with In-Situ Spike Detection and Preservation Author(s): Kim, Seong-Jin; Liu, Lei; Yao, Lei; Gao, Yuan; Je, Min Kyu Abstract: We present an implantable neural recording IC with a unique scheme for detecting spike signals and preserving their waveform in real-time. Each channel in the proposed device has a delta modulator that stores a series of consecutive subtracted signal values. The delta modulation doesn't only allow low-voltage operation by reducing the signal dynamic range, but also detects only the spike signal by extracting its two key features, frequency and amplitude, in analog domain. The full waveform of the detected spike signal is accurately conserved and transmitted to outside. A prototype recording IC with 16 channels has been fabricated using 1P6M 0.18-mu m CMOS and demonstrates to record the spike signal successfully. It only consumes 0.88 mu W/channel at 0.5 V supply and its spike detection technique can save much more power in the overall system by compressing the neural signal to be transferred. 2015-11-01T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/56400 Title: CPWG-fed reconfigurable beam steering antenna using dipole and loop combined structure Author(s): Ha, S. -J.; Kim, J. -Y.; Kim, Y. -J.; Park, Tae Joon; Lee, B. -J.; Jung, C. W. Abstract: This paper proposes a coplanar waveguide with lower ground (CPWG)-fed reconfigurable beam steering antenna using a bended dipole and circular loop combined structure. The radiation patterns of the antenna head towards specific directions when the dipole and loop antenna are combined at a reasonable ratio. The proposed antenna can steer the beam directions by controlling two RF switches (PIN diode). The maximum beam directions are +30°, 0°, and -30° in the azimuth plane, and the overall gains are 4.0-5.4 dBi in the operation bandwidth of 2.39-2.59 GHz. © 2012 Taylor & Francis. 2011-12-31T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/47625 Title: A scheme improving fast PMIPv6-based network mobility by eliminating tunneling overload for ITS Author(s): Ryu, Seonggeun; Choi, Ji-Woong; Park, Kyung-Joon Abstract: NEtwork MObility Basic Support (NEMO BS) protocol has been investigated to provide Internet connectivity of a group of nodes, which is suitable for Intelligent Transportation Systems (ITS) applications. Since NEMO BS is based on Mobile IPv6 (MIPv6), it often increases traffic load and handover latency due to the handover procedure. Thus, schemes combining Proxy MIPv6 (PMIPv6) with NEMO (P-NEMO) have emerged to solve these problems. However, they still suffer from packet loss and long handover latency during the handover. To prevent packet loss and reduce the handover latency, Fast P-NEMO (FP-NEMO) has emerged. Although FP-NEMO accelerates the handover procedure through tunneling, it may cause a serious burden of the tunnel between Mobile Access Gateways (MAGs). This is because all packets destined for Mobile Network Nodes (MNNs) are forwarded to a New MAG (NMAG) through the tunnel between MAGs. This problem becomes more critical, as the number of MNNs is large and there exists heavy traffic between MAGs. Therefore, we propose a scheme Improving FP-NEMO (IFP-NEMO) to eliminate that tunneling burden. IFP-NEMO performs the registration prior to the layer 2 handover. When the registration is completed, packets are forwarded to the NMAG directly, so that the tunnel between MAGs is not used during the handover. IFP-NEMO is analyzed and compared with FP-NEMO through performance evaluations. We show that IFP-NEMO outperforms FP-NEMO in numerical results. 2012-06-04T15:00:00Z https://scholar.dgist.ac.kr/handle/20.500.11750/16842 Title: 스마트 스크류 Author(s): 최재석; 김준영; 윤상연; 황재윤; 제민규; 김신윤; 이희성; 서안나