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Oh, Gyung-Jae,Moon, Jiyoung,Lee, Yu-Mi,Park, Hyeung-Keun,Park, Ki Soo,Yun, Yong-Woon,Kang, Gilwon,Kim, Byoung-Gwon,Seo, Jae-Hee,Lee, Heeyoung,Lee, Won Kyung,Lee, Kun Sei,Kim, Hee-Sook,Lee, Young-Hoon The Korean Academy of Medical Sciences 2016 JOURNAL OF KOREAN MEDICAL SCIENCE Vol.31 No.11
<P>The aim of this study was to investigate time trends in the public awareness of stroke and its predicting factors. The target population was 9,600 community-dwelling adults, aged 19–79 years, in 16 metropolitan cities and provinces in Korea. The survey samples in 2012 and 2014 were selected separately (entirely different sets of subjects) using a proportionate quota sampling method. Information concerning knowledge of stroke and demographics was collected by trained telephone interviewers using random digit dialing. After excluding subjects with a non-response or refusal to answer any question, the analyses included 8,191 subjects in 2012 and 8,127 subjects in 2014. Respondents’ awareness of stroke warning signs (numbness or weakness, difficulty speaking or understanding speech, dizziness, visual impairment, and severe headache) was highest for difficulty speaking or understanding speech (80.9% in 2012 and 86.4% in 2014). There were significant increases in the proportion of respondents understanding the appropriate action (i.e., calling an ambulance) at the time of stroke occurrence (59.6% to 67.1%), and in the proportion aware of the general need for prompt treatment (86.7% to 89.8%). In multivariable logistic regression analysis, older age, higher education level, higher household income, current non-smoking, exposure to stroke-related public relations materials, and experience of stroke education were significantly associated with both high knowledge of stroke warning signs and awareness of the need for prompt treatment. Between 2012 and 2014, the public’s awareness of stroke increased significantly. More specialized interventions, including public relations materials and education, should focus on subgroups who have lower stroke knowledge.</P>
Randomly-Directional Beamforming in Millimeter-Wave Multiuser MISO Downlink
Gilwon Lee,Youngchul Sung,Junyeong Seo IEEE 2016 IEEE TRANSACTIONS ON WIRELESS COMMUNICATIONS Vol.15 No.2
<P>In this paper, the performance of opportunistic random beamforming (RBF) and the multiuser (MU) gain in millimeter-wave (mm-wave) MU multiple-input single-output (MISO) downlink systems are analyzed based on the uniform random single-path (UR-SP) channel model suitable for highly directional mm-wave radio propagation channels. It is shown that under the UR-SP channel model, RBF achieves linear sum rate scaling with respect to (w.r.t.) the number of transmit antennas and, furthermore, yields optimal sum rate performance when the number of transmit antennas is large, if the number of users increases linearly w.r.t. the number of transmit antennas. Several beam training and user selection methods are investigated to yield insights into the most effective beamforming and scheduling choice for mm-wave MU-MISO in various operating conditions. Simulation results validate our analysis based on asymptotic techniques for finite cases.</P>
Development of a Compact Home Health Monitor for Telemedicine
Yoon, Gilwon,Lee, Jong Yeon,Jeon, Kye Jin,Park, Kun Kook,Kim, Hong Sig Mary Ann Liebert 2005 Telemedicine and e-health Vol.11 No.6
<P>A compact and easy-to-use home health monitor was developed. A palm-size health monitor contained a finger probe as sensor unit. In the finger probe, light from a light emitting diode (LED) array was illuminated on a finger nail bed, and transmitted light was measured to obtain photoplethysmography (PPG) signals. Hematocrit, pulse, respiration rate, and saturated oxygen in arterial blood (SpO(2)) were measured simultaneously from PPGs using five different wavelengths: 569, 660, 805, 904, and 975 nm. To predict hematocrit, a dedicated algorithm was used based on scattering theory of red blood cells using these wavelengths. Preliminary clinical tests showed that the achieved percent errors were +/- 8.2% for hematocrit when tested with 549 persons (N = 549). Digital filtering techniques were used to extract respiratory information from a single PPG signal. SpO(2) was predicted on the basis of the ratio of the wavelengths 660 nm and 940 nm. The accuracies were within clinically acceptable errors. In addition, the compact home health monitor included a blood pressure monitoring unit. For convenient and simultaneous measurement with the other previously mentioned signals, blood pressure was measured on a finger. An air cuff was installed on the same finger where PPGs were measured. Achieved mean differences were +/- 3.8 mmHg for systole and +/- 5.1 mmHg for diastole. One can use the palm-size monitor simply by inserting a finger into the home health monitor that is suitable for telemedicine.</P>
SLIM & DUAL OPTICAL SYSTEM FOR NEXT HENERATION OF HEADLAMPS
Hyunsoo Lee(이현수),Gilwon Han(한길원) 한국자동차공학회 2022 한국자동차공학회 학술대회 및 전시회 Vol.2022 No.11
When a new car is released on the market, we can see easily an image of a lit area on a new car with dark background. It shows a signature image of a new car directly. Because a lot of car makers wants to show their design identity as lighting images. And also they would like to keep a same image during day and night. To realize it, low beam optical module should work for DRL function too. But it is quite difficult because light distribution area is quite different each other. Low beam has horizontal cut off line. But DRL is more like high beam which is without cut off line. Here we have an idea to operate both functions properly by using the Prism Optical Module which is for Bi-Function. POM (prism optical module) has 2 light sources for low beam and DRL. Each light sources turn on and off for day and night! It gives a same design identity all days. It is real signature for the next generation headlamp. POM consists of 2 light sources, collimator lenses, Prism lens which is for light guide with projection lens. It can be seen as below photo. [그림 본문 참조]
석길원(Gilwon Seok),이종원(Won Lee),백낙훈(Nakhoon Baek),유관우(Kwan-Woo Ryu) 한국정보과학회 2001 한국정보과학회 학술발표논문집 Vol.28 No.2Ⅱ
본 논문에서는 모션 캡쳐 데이터를 변위(displacement)로 해석하여, 원 모션(original motion)과 유사한 움직임들로 변형하거나 상이한 모션들을 통합하는 방법을 제안한다. 이 방법에서는 모션 캡쳐 데이터가 동작의 세부 특성을 잘 표현할 수 있다는 점을 이용하여, 사실성을 유지하면서도 쉽고 빠르게 모션 데이터를 편집하고자 한다. 본 논문이 제안하는 방법은 시간과 위치를 순차적으로 변형하여 새로운 모션을 표현한다. 우선, 시간 변형 과정에서는 특정 모션에서의 시간 변화를 사용자의 강조 정도에 따라 변형함으로써 모션의 리듬을 변형시킨다. 다음 단계인 위치 보정 과정에서는 원 모션을 변위로 사용하는 모션 치환 맵(motion displacement map) 기법을 이용하여 모션의 데이터 곡선들을 변형 또는 합성한다. 이 방법에서는 원 모션을 움직임에 대한 변위로 해석하여, 원 모션이 가지는 자연스러움을 유지할 수 있을 것으로 기대한다. 모션 편집을 위한 시스템 구현되었고, 실험을 통하여 이 방법들이 사용될 수 있음을 보였다.
Two-Stage Beamformer Design for Massive MIMO Downlink By Trace Quotient Formulation
Donggun Kim,Gilwon Lee,Youngchul Sung Institute of Electrical and Electronics Engineers 2015 IEEE Transactions on Communications Vol. No.
<P>In this paper, the problem of outer beamformer design based only on channel statistic information is considered for two-stage beamforming for multi-user massive MIMO downlink, and the problem is approached based on signal-to-leakage-plus-noise ratio (SLNR). To eliminate the dependence on the instantaneous channel state information, a lower bound on the average SLNR is derived by assuming zero-forcing (ZF) inner beamforming, and an outer beamformer design method that maximizes the lower bound on the average SLNR is proposed. It is shown that the proposed SLNR-based outer beamformer design problem reduces to a trace quotient problem (TQP), which is often encountered in the field of machine learning. An iterative algorithm is presented to obtain an optimal solution to the proposed TQP. The proposed method has the capability of optimally controlling the weighting factor between the signal power to the desired user and the interference leakage power to undesired users according to different channel statistics. Numerical results show that the proposed outer beamformer design method yields significant performance gain over existing methods.</P>