• Journal of the Institute of Electronics Engineers of Korea TC
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• v.43 no.1 s.343
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• pp.143-148
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• 2006

This paper presents a high isolation and power-handling single-pole double-throw(SPDT) switch for dual band wireless LAN applications. The switch circuit has asymmetric topology which uses stacked-gate to have high power-handling and isolation for the Tx path. The proposed SPDT switch has been designed with optimum gate-width, bias, and number of stacked-gate FET. This SPDT switch has been implemented with $0.25{\mu}m$ GaAs pHEMT process which has Gmmax of 500mS/mm and fmax of 150GHz. The designed SPDT switch has the measured insertion loss of better than 0.9dB and isolation of better than 40dB for the Tx path and 25dB for the Rx path and the high power handling capability with PldB of about 23dBm for control voltage of -3/0V. The fabricated SPDT switch chip size is $1.8mm{\times}1.8mm$.

• Journal of Korean Society of Transportation
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• v.29 no.1
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• pp.125-134
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• 2011

In order to reconstruct vehicle-pedestrian collision accidents, this paper presents a fuzzy tool to estimate accurately the impact velocity of the vehicle using parameters which could be easily collectable at the accident scene. The fuzzy rules and membership functions were set up using number of over 200 domestic and foreign data from accidents and empirical tests and 700 data from multibody simulation experiments. The developed fuzzy tool deduces the category of pedestrian trajectory and impact speed of the vehicle using 4 membership functions and 2 logic rules. The membership function of throw distance was differently set according to the deduced category of trajectories. The implemented fuzzy program was validated through comparing with the domestic and foreign empirical data. The output results agree very well in impact velocities of vehicle resulting the accuracy and usefulness of the developed tool in the reconstruction analysis of vehicle-pedestrian collision accidents.

• Journal of rehabilitation welfare engineering & assistive technology
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• v.10 no.1
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• pp.101-106
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• 2016

In this paper, we analysed correlation between scores and posture of amateur archer with inertial sensor based motion analysis system. Four 13 to 15 yeared subjects are participated and accelerations of upper and forearms are measured during shooting. Each subject carried out six end. And they shoot arrows six times per each end from 30 meters away. We extracted and analyzed acceleration values during full throw. In the case of left arm, we could not found any meaningful correlation with score. Meanwhile, acceleration values of right arm have certain correlation with score. It seems that aiming skill of right arm is very important while left arm settles stably.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.16 no.12
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• pp.1204-1211
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• 2004

It is difficult to apply a conventional selection guide for diffusers when the diffuser is installed in a perimeter zone, because the air diffusion performance index (ADPI) vs. throw/length (T/L) ratio curve listed in conventional guide does not consider the perimetric heating load through the walls. The objective of this study is to evaluate the effect of the perimetric heating load on the ADPI and propose a selection guide for a proper line diffuser when perimetric heating load exists. The velocity and temperature distributions and the ADPI values are obtained numerically with various heat load ratios and air flow rates. The velocity and temperature distributions and the ADPI values are analyzed by CFD in case of various heat load ratios and air flow rates. Also, ADPI was calculated by those results. The ADPI values by numerical results are compared with an existing experimental data to verify the method for the evaluation of ADPI proposed in a present study. In case of a line diffuser installed at the high side wall, the ADPI decreases according to the increases of the flow rate on every heat load ratio of the present study except 0.75. The ADPI vs. T/L ratio curves have been proposed for the heat load ratios of 0.25, 0.5, 0.75 to guarantee the comport thermal environment when diffusers are installed in perimeter zone.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.22 no.6
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• pp.223-229
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• 2023

This papart proposes single pole double throw (SPDT) switch with six-stage radial stub resonators in the 3.6~4.0 GHz band. The switch was simulated using ADS (Advanced Design Software), a design tool for the wireless communication circuits, and evaluated on a pcb substrate. The measurement results of the radial SPDT switch showed an average 90 dB isolation, and 1.5 dB insertion loss. This isolation characteristic was 20 dB superior to higher than those laboratory or commercial products reported thus far. The proposed SPDT switch is applicable to multi-band RF front-end systems, such as WiMAX, LTE/5G, Wi-Fi, and HyperLAN.

• 한국연소학회:학술대회논문집
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• 2006.10a
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• pp.151-155
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• 2006

The large amount of energy is consumed in a process for keeping the high temperature melting pool. For this reason, in addition to the wastes input to keep the high temperature melting pool, it is necessary for an auxiliary fuel and LOx to throw into the melting pool. So in this study, using a new melting furnace system, the experiments to keep the melting pool with minimal energy without throwing an auxiliary fuel and LOx was carried out. Also it is hoped that the results of the experiment will be available to analyze keeping a melting pool and behavior in a melting furnace.

• Journal of Fashion Business
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• v.8 no.4
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• pp.104-116
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• 2004

Kanga is a type of cotton clothes with splendid patterns that East African women throw on their bodies. It first appeared in the East African shores in the mid-nineteenth century. A new style of squared handkerchiefs brought to Africa by Portuguese merchants for the first time was referred as to leso of which early designs were in a basic form of white dots on dark background. Consumers called such material by kanga as they began mentioning its craftiness and comparing its elegant nature to a sociable red rooster and graceful feathers. From the early 1990s, Swahili characters have been embroidered in designs of kanga, mainly consisted of proverbs. Kenya's kanga products are widely known and well represented whereas Tanzania makes the best use of it for political and social events. Fascinating and practical kanga has established its position as an essential part of East African cultures that is being well received as a fashion style there in these days.

• Proceedings of the IEEK Conference
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• 2003.07c
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• pp.2915-2918
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• 2003

The increase of vehicles stagnations leads to the increasing attention to the way customers pay and a large number of projects on electronic cash system. Tranport system is comprised of a number of advanced technologies, including information processing, communications, control, and electronics. Recently many research on a system which provides contact in order to protect driver's vehicle passage have been carried out. And some potential problems from that system are being reviewed by electronic cash system. In this papers, we suggest RF protocol developing technology using the concept of electronic cash. ATM electronic cash developing is consist of component of pre-developed coin throw, Integration of component using its, and production of more requirement-satisfactory ITS solution. Result increase 15∼40％ pre-type vehicles stagnations. Especially, we expect this proposed concept would be well adapted to our national environments.

• The Journal of Internal Korean Medicine
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• v.36 no.3
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• pp.252-264
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• 2015

Complementary and alternative medicine (CAM) is becoming a popular health care means in most countries, and more than 70% of the developing world's population is depending on CAM, including traditional Chinese medicine and ayurvedic medicine. Islamic medicine, another CAM, has shown remarkable success in healing acute and chronic diseases and has been utilized by people in Mediterranean countries. This paper aims to throw light on Islamic medicine through Ibn Sina, known as Avicenna in the West; Ibn Sina was a celebrated Persian thinker, philosopher, and physician who is remembered for his masterpiece, The Canon of Medicine. The paper also discusses the relationship between Islamic medicine and Korean medicine.

• Proceedings of the Korea Electromagnetic Engineering Society Conference
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• 2005.11a
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• pp.111-114
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• 2005

The isolation performance of the S-band single-pole single-throw (SPST) monolithic microwave integrated circuit (MMIC) switch with two different RF-interconnection approaches, microstrip and grounded coplanar waveguide (GCPW) lines, are investigated. On-to-off isolation is improved by 5.8 dB with the GCPW design compared with the microstrip design and additional improvement of 6.9dB is obtained with the coplanar wire-bond interconnection (CWBI) at 3.4 GHz. The measured insertion loss and third-order inter-modulation distortion (IMD3) are less than 2.43 dB over 2.5 CHz $\sim$ 4 GHz and greater than 64 dBc.