http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
Dong‑Geun Seo,Jeong‑Soo Park,Gun ‑Ki Lee,Wang‑Sang Lee 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.4
In this paper, a lightweight printed dipole antenna array with 3×2 beamforming network for wide unmanned aerial vehicle (UAV) communication coverage is presented. The proposed antenna consists of an upper substrate, a lower substrate, and two supports with a microstrip feeding. The upper substrate has a two-element printed dipole antenna array, and the lower substrate includes a beamforming feeding circuit and a ground plane as a refector of the proposed antenna array for gain improvement. For wide beam coverage, the proposed feeding network consists of three RF switches, one Wilkinson power divider, and one 90° hybrid coupler, and generates the wide beam using one broadside beam and two end-fre beams. Measured impedance bandwidth, peak gain, and half-power beamwidth (HPBW) of the proposed array operated from 5.03 to 5.15 GHz are approximately 2 GHz, 4.3 dBi, and 155°, respectively.
요추부염좌로 진단된 교통사고환자 27례와 비교통사고환자 33례에 대한 임상적 비교고찰
신정철,박은주,나건호,이동현,류충열,윤여충,채우석,조명래,Shin, Jeong-cheol,Park, Eun-ju,Na, Gun-ho,Lee, Dong-hyun,Ryu, Chung-ryul,Yoon, Yeo-choong,Chae, Wu-suk,Cho, Myung-rae 대한침구의학회 2004 대한침구의학회지 Vol.21 No.3
Objective : The main purpose of this research is to make a survey of the effective way of the Korean traditional medical care about Traffic accidental patients. Methods : In following research, 27 patients of Traffic accident and 33 patients of Non-Traffic accident to be diagnosied as Lumbar spine Sprain who hospitalized in the Dong-shin Korean Traditional Medicine Hospital from January 1, 2003 to November 31, 2003 were surveyed. Result : 1. In distribution of sex and age, the female ratio was higher and twenties was the most distribution of age in Traffic accidental patients, the male ratio was higher and tirties was the most distribution of age in Non-Traffic accidental patients. 2. the number of patients via other hospital was much than that of the first visitor to our hospital in Traffic accidental patients, but the case of Non-Traffic accidental patients was contray results. 3. In medical Treatment, acupunture theraphy(100.0%), negative theraphy(100.0%), moxibustion theraphy(74.07%) et. was used in Traffic accidental patients, acupunture theraphy(100.0%), negative theraphy(100.0%), moxibust ion theraphy(84.84%), herbal acupunture theraphy(54.54%) et. was used in Non-Traffic accidental patients.
( Dong Won Park ),( Ji Young Yhi ),( Gun Woo Koo ),( Sung Jun Jung ),( Hyun Jung Kwak ),( Ji Yong Moon ),( Sang Heon Kim ),( Tae Hyung Kim ),( Jang Won Sohn ),( Dong Ho Shin ),( Sung Soo Park ),( Ho J 대한결핵 및 호흡기학회 2014 Tuberculosis and Respiratory Diseases Vol.77 No.3
Invasive pulmonary aspergillosis (IPA) is rarely reported in patients who have normal immune function. Recently, IPA risk was reported in nonimmunocompromised hosts, such as patients with chronic obstructive pulmonary disease and critically ill patients in intensive care units. Moreover, influenza infection is also believed to be associated with IPA among immunocompetent patients. However, most reports on IPA with influenza A infection, including pandemic influenza H1N1, and IPA associated with influenza B infection were scarcely reported. Here, we report probable IPA with a fatal clinical course in an immunocompetent patient with influenza B infection. We demonstrate IPA as a possible complication in immunocompetent patients with influenza B infection. Early clinical suspicion of IPA and timely antifungal therapy are required for better outcomes in such cases.
P-89 Emergency department visits by lung cancer patients in Korea
( Dong Won Park ),( Gun Woo Koo ),( Tai Sun Park ),( Ji-yong Moon ),( Sang-heon Kim ),( Tae-hyung Kim ),( Ho Joo Yoon ),( Dong Ho Shin ),( Jang Won Sohn ) 대한결핵 및 호흡기학회 2016 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.121 No.-
Background: We aimed to determine the frequency and main causes of emergency consultations and the predicting factors for hospital admissions and deaths. Methods: We reviewed retrospectively all the cases of ED visit for six months, from July 2014 to December 2014, in three university hospitals: Hanyang University Hospital and Chung-Ang University Hospital in Seoul, and Chungbuk National University Hospital in Cheongju using National Emergency Department Information System Database (NEDIS). We identified cases with lung cancer and performed descriptive statistics and logistic regressions analysis. Results: Of all 62,369 ED visits, there were 292 ED visit (0.47%) by 216 patients with lung cancer. Among them, 76.4% had only one ED visit in study period. The main reasons for consultation were respiratory symptoms (36.8%) and fatigue/alteration of the general state (12.7%), and pain (12.4%). ED visit leads to hospital admission in 74.9% and hospital death in 25.1% of lung cancer patients. In multivariate analysis, the main independent predictor factors of hospitalization are diagnostic phase of lung cancer (odd ratio 9.3) and the transfer from another hospital (odd ratio 4.9). The palliative phase with best supportive care alone (odd ratio 5.2) and abnormal heart rate at the time of ED visit (odd ratio 2.4) are statistically associated with death during hospitalization. Conclusions: Our study shows that ED visit is a frequent but clinically important event for patients with lung cancer.
Common-Mode Noise Reduction Technique for Back-to-back Bridgeless PFC
Dong-Kwan Kim,Jae-Sang Kim,Dong-Min Choi,Jaein Lee,Gun-Woo Moon 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, based on the pulsating voltage analysis, a CM noise reduction method of the back-to-back BPFC is introduced. In this method, two types of pulsating voltage, a pulsating voltage in the switching cycle and a pulsating voltage in the line input voltage, are considered. Based on the analysis, a proper design method of selecting the external large capacitors of inrush diodes is presented. The feasibility of the proposed analysis and method is verified by the experiments with 800W/400V prototype. From the experiments, the validity of the presented design method about CM noise reduction is validated. Therefore, the proposed analysis and method is adaptable to reduce the CM noise of back-to-back BPFC by supporting proper selecting guide for the external capacitors of inrush diodes.
A Study on the EM Wave Absorber for Improving Electromagnetic Environment of Wireless LAN at 2.4 GHz
Gun-Suk Yoo,Dong-Il Kim,Dong-Soo Choi,Dong Han Choi 한국항해항만학회 2010 한국항해항만학회지 Vol.34 No.7
In this paper, we designed and fabricated the Electro-Magnetic (EM) wave absorber for wireless LAN by using Amorphous and CPE. The material constants and the absorption properties were measured for the samples containing 50 %, 60 %, and 70 % weight fraction of Amorphous. Moreover, the EM wave absorption abilities were simulated for the EM absorbers in different thicknesses by adopting the measured permittivity and permeability, and then the EM wave absorber was fabricated based on the simulated design values. As a result, the EM wave absorber with the composition ratio in Amorphous : CPE = 60 : 40 wt.% with the thickness of 4 mm has the absorption ability more than 35 dB at 2.4 GHz. Thus, it is expected the wireless LAN environment can be improved by using the developed absorber.
Multiport Measurement Method Using a Two-Port Network Analyzer With Remaining Ports Unterminated
Dong Gun Kam,Joungho Kim THE INSTITUTE OF ELECTRICAL ENGINEERS 2007 Vol. No.
<P>A practical multiport measurement method is presented for the precise characterization of an N-port device using a two-port vector network analyzer. Because the 2 unused ports need not be terminated with matched loads, a test fixture can be simplified. Any influence of the reflections from the unterminated ports can be deembedded by port renormalization. The proposed method was verified with a coupled microstrip line structure.</P>