• JSTS:Journal of Semiconductor Technology and Science
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• v.15 no.6
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• pp.585-593
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• 2015

In the nanoscale regime, many multigate devices are explored to reduce their size further and to enhance their performance. In this paper, design of a novel device called, Triple Material Surrounding Gate Tunnel Field effect transistor (TMSGTFET) has been developed and proposed. The advantages of surrounding gate and tunnel FET are combined to form a new structure. The gate material surrounding the device is replaced by three gate materials of different work functions in order to curb the short channel effects. A 2-D analytical modeling of the surface potential, lateral electric field, vertical electric field and drain current of the device is done, and the results are discussed. A step up potential profile is obtained which screens the drain potential, thus reducing the drain control over the channel. This results in appreciable diminishing of short channel effects and hot carrier effects. The proposed model also shows improved ON current. The excellent device characteristics predicted by the model are validated using TCAD simulation, thus ensuring the accuracy of our model.

• 제어로봇시스템학회:학술대회논문집
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• 1992.10a
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• pp.90-94
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• 1992

A portable multichannel functional electrical stimulation(FES) system for the fine control of the paralyzed extremities in spinal cord injury patients is described. This system is composed of a stimulation data creating system, a serial communication device, a 16-bit microprocessor, D/A converter of 32 channels and a display device. Stimulation patterns are created from analytical results of integrated EMGs during motion in normal subjects and are stored in the stimulation data creating system as data files. And then the stimulation patterns are sent to the memory in the portable multichannel FES system through serial communication interfacing device. Sophisticated fine control of paralyzed extrimities was realized by transmitting multichannel stimulation patterns to percutaneous intramuscular electrodes, which stimulate the motor function of paralyzed muscle simultaneously. Advantages of this system are as follws: 1) It is possible to modify stimulation patterns in accordance with the patient's situation. 2) This system is small and light.

• Journal of Advanced Navigation Technology
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• v.27 no.2
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• pp.167-172
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• 2023

The P-3C maritime patrol aircraft operated by the Republic of Korea Navy is equipped with various sensor devices (LRUs, line replace units) for tactical data collection. Depending on the characteristics of the sensor device, it operates with various communication protocols such as IEEE 802.3, MIL-STD-1553A/B, and ARINC-429. In addition, the collected tactical data is processed in the tactical station for mission operators, and this tactical station constitutes a clustering network on Gigabit Ethernet and operates in a distributed processing method. For communication with the sensor device, a specific tactical station mounts a peripheral device (eg. ARINC-429 interface card). The problem is that the performance of the entire distributed processing according to the peripheral device control and communication relay of this specific device is degraded, and even the operation stop of the tactical station has a problem of disconnecting the communication with the related sensor device. In this paper, we propose a method to mount a separate gateway to solve this problem, and the validity of the proposed application is demonstrated through the operation result of this gateway.

• JSTS:Journal of Semiconductor Technology and Science
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• v.7 no.2
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• pp.110-119
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• 2007

A new two-dimensional analytical model for dual-material double-gate fully-depleted SOI MOSFET with Pearson-IV type Doping Distribution is presented. An investigation of electrical MOSFET parameters i.e. drain current, transconductance, channel resistance and device capacitance in DM DG FD SOI MOSFET is carried out with Pearson-IV type doping distribution as it is essential to establish proper profiles to get the optimum performance of the device. These parameters are categorically derived keeping view of potential at the center (${\phi}_c$) of the double gate SOI MOSFET as it is more sensitive than the potential at the surface (${\phi}_s$). The proposed structure is such that the work function of the gate material (both sides) near the source is higher than the one near the drain. This work demonstrates the benefits of high performance proposed structure over their single material gate counterparts. The results predicted by the model are compared with those obtained by 2D device simulator ATLAS to verify the accuracy of the proposed model.

• Journal of the Optical Society of Korea
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• v.7 no.1
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• pp.28-33
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• 2003

We describe the optimal design and the fabrication of a 2$\times$2 port optical device based on the thin film filter (TFF), and also propose a 4-channel OADM module using these devices. The optical performance of the proposed OADM module is evaluated theoretically and experimentally, and is compared to that of typical OADM modules using 1$\times$2 port optical devices for 4, 8, 16 and 32 drop channels in optical transmission systems. Since the 2$\times$2 port optical device accomplishes the function of wavelength multiplexing and demultiplexing simultaneously in the proposed OADM module, the insertion loss of through channels can be improved by 1.2 dB compare to that of typical OADM modules using 1$\times$2 port optical devices. In addition, both the size and the price of the module can be reduced to 40~50%.

• Transactions on Electrical and Electronic Materials
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• v.17 no.2
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• pp.118-120
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• 2016

A coplanar waveguide employing periodic 3D coupling structures (CWP3DCS) was developed for application in miniaturized on-chip passive components on silicon radio frequency integrated circuits (RFIC). The CWP3DCS showed the shortest wavelength of all silicon-based transmission line structures that have been reported to date. Using CWP3DCS, a highly miniaturized impedance transformer was fabricated on silicon substrate, and the resulting device showed good RF performance in a broad band from 4.6 GHz to 28.6 GHz. The device as was 0.04 mm² in size, which is only 0.74% of the size of the conventional transformer on silicon substrate.

• Journal of the Korea Society of Computer and Information
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• v.12 no.5
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• pp.83-92
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• 2007

In this paper, we present a design and implementation of three dimensional pointing device using Inertial Navigation System(INS) that acquires coordinates and location information without environmental dependancy. The INS measures coordinates based on the data from gyroscope and accelerometer and corrects the measured data from accelerometer using Kalman-Filter. In order to implement the idea of three dimensional pointing device, we choose a three dimensional Space-recognition mouse and use RFIC wireless communication to send a measured data to receiver for printing out the coordinate on display equipment. Based on INS and Kalman-Filter theoretical knowledge, we design and implement a three dimensional pointing device and verified the usability as an input device that can capture a human's move. also, we describe the applicability of this device in ubiquitous computing environment.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.2
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• pp.110-121
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• 2020

Since the number of user equipments has also increased rapidly, the problem of network load due to frequent handover of user equipments has occurred. As a solution to this we expect to be able to reduce network overload problems and the delay caused by handover using LTE-based D2D communication. In this paper, we proposed a proposal to support handover via a preceding user equipment using LTE-based D2D communication by handover method of existing LTE network. We proposed a method that can efficiently solve the handover situation of the user equipment via the preceding user equipment in order to reduce the overlapping signal used at the time of handover between the base station and the user equipment. The handover delay accompanying the change in the number of user equipments was able to confirm the result that the suggested scheme was reduced as compared with the existing LTE handover.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2011.10a
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• pp.109-113
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• 2011

In intelligent subway systems, UWB-based WiMedia D-MAC Protocol can be considered to send and receive multimedia data which requires high data rate. However, network devices which do not exist within 10 meters, the limited communication rage, can not communicate with each other because WiMedia does not support multi-hop communications. In this paper, we developed the algorithm to select a relaying device for multi-hop routing on WiMedia networks. In the first step, each device acquires information of neighbors through beacon and decides whether it is a normal or relaying device using the acquired information. In the next step, all devices can create the 2-hop routing table using the information received via relaying devices and the whole routing table for all devices on networks, eventually.

• Annual Conference of KIPS
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• 2012.11a
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• pp.33-35
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• 2012

최근 와이파이, 블루투스 등 근거리 무선 통신 기술의 발달로 홈네트워크, U-City, 홈오토메이션 등의 실생활 적용이 가능해졌다. 이미 삼성, LG 등의 기업에서는 관련 제품을 양산 및 판매하고 있으며 그 기술의 관련연구 또한 활발하게 진행되고 있다. 하지만 이러한 기존 제품 및 시스템들은 가격이 높고 인터넷을 기반으로 운용되기 때문에 AP (Access Point)가 반드시 존재하여야 하며 가정 내의 모든 전자기기들을 연동시키기 위해 구현이 복잡하다는 문제점을 갖는다. 본 논문에서는 이를 해결하기 위해 기존 와이파이 다이렉트 및 블루투스의 D2D (Device-to-Device) 기술을 적용하여 AP의 필요성을 없애고 불필요한 연동을 제외하며 간단한 구현을 요구하는 저가의 제품을 개발하고자 한다. 실험적인 구현을 위해 모터 및 카메라 제어, 타이머, 통신 등이 가능한 AVR ATmega169 마이크로 컨트롤러와 스마트폰을 사용하여 원격 디지털도어락 관리 시스템을 제안한다.