Lightweight Printed Dipole Antenna Array With 3×2 Beamforming Network for Wide UAV Communication Coverage

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.

중학생의 방과후학교 체육 활동 참가가 학업스트레스와 학교생활 만족에 미치는 영향

박주영,김동건 忠南大學校體育科學硏究所 2008 體育科學硏究誌 Vol.26 No.1

The purpose of this study is to investigate the influence of the extra curricular physical education program participation on stress of studies and life satisfaction of school in middle school. This study's model were set up based on the previous research and theory in order to achieve the goal of the research. As to the research object, this investigation was excuted by 210 students who participated the extra curricular physical education program and 210 students who non-participated among the middle schools located in Daejeon city. Modified questionnaire that statistically verified by factor analysis was given to subjects to prove the research hypothesis, it used frequency analysis, Crombach's Alpha test, factors analysis, t-test and ANOVA and relationship analysis and covariance structure analysis. With the above research methods and procedures, the study reached the following conclusions. First, participation students at the extra curricular physical education program had less stress of studies than non-participation students. Second, participation students at the extra curricular physical education program had higher life satisfaction of school than non-participation students. Third, the extra curricular physical education program participation influenced on stress of studies and life satisfaction of school. So this conclusion shows that the extra curricular physical education program is necessary to reduce student's stress of studies and improve student's life satisfaction of school.

古代中國人의 醫療體操에 관한 硏究

朴吉俊,李東鍵 東亞大學校 附設 스포츠科學硏究所 1993 스포츠科學硏究論文集 Vol.11 No.-

The purpose of this study is on searching out the medical gymmastics of ancient chienese. The major point considered in the thesis follow ; 1. The process of formation in the medical gymnastics of ancient chinese has been formed by Taoist school as a means of the secret of long life. 2. The aspect of development in the medical gymmastics of ancient chinese gas been developed the art of「To-In」with the history of 5000 year. This is named 「Gi-Gang」in the present-day. 3. The medical gymnastics of taegae Lee in Korean philosophy of human nature and natural laws turn out「Pal-Dan-Kumd」in the medical gymnastics of ancient chinese.

홈 네트워크 테스트베드 설계 및 구축

박세건,강투무르,김동균,이상정 순천향대학교 부설 산업기술연구소 2004 순천향 산업기술연구소논문집 Vol.10 No.2

Recently, as many next-generation appliances are become digital and intelligent, companies have come out various networked appliances to communicate with each other though home network. It will be expensive and difficult to apply new technologies using real appliances for verifying application services. Therefore, a home network testbed, which is consisted of simulator and emulator for verifying interworking services of various information appliances, is needed to reduce design cost and time. In this paper, a home network testbed is implemented and designed to support interworking services of home network. The devices in the testbed are designed with modular components for reusability, and the components are invoked through XML message. The correctness and effectiveness of the testbed is verified through interworking services on various components.

골수이식 후 발생한 출혈성 방광염 환자에서 Polyomavirus의 검출 양상

박민정,강희정,신동훈,이규만,이동건,최정현,김춘추 대한임상병리학회 2000 대한임상병리학회지 Vol.20 No.6

뇌출혈이 합병된 감염성 심내막염 1례

박동건,이재욱,권삼,이동철,강승완 동국대학교 경주대학 1997 東國論集 Vol.16 No.2

감염성심내막염에 의한 신경계 합병증은 색전성 뇌경색, 색전성 뇌출혈, 두개내 패혈성 동맥류, 뇌농양, 뇌막염등 다양한데 항생제 요법의 발달과 판막치환술에도 불구하고 그 빈도는 감소되지 않고 있다. 이 중 두개내 패혈성 동맥류의 파열에 의한 뇌출혈은 사망률이 80%로 치명적일 수 있어 조기 발견 및 적절한 치료가 필요하다. 저자들은 두통, 열감, 근육통 등의 증상으로 내원하여 감염성 심내막염으로 진단받고, 항생제 치료로 임상증세의 호전중에 심한 두통과 전신적 발작이 있은 후 갑자기 발생한 두개내 뇌출혈을 심장초음파 및 뇌 컴퓨터 단층촬영을 통하여 진단, 경험하였기에 문헌고찰과 함께 보고하는 바이다. The complications of infective endocarditis may involve any organ system ie, cardia, neurologic, vascular, dermatologic, and kidney. Extracardiac complications are usually caused by either embolization of vegetations or deposition of immune complexes. Neurologic complications remain a significant problem in bacterial endocarditis and have been reported to occur in up to 20% to 40% of cases of infective endocarditis. The various types of central nervous system disease seen in patients with infective endocarditis are cerebral embolism (with infarction or with intracerebral hemorrhage), intracranial mycotic aneurysm, seizures, brain abscess, meningitis, mental change, psychiatric disorder. Mycotic aneurysms are uncommon but not rare and are an important cause of local or systemic sepsis and acute hemorrhage following aneurysmal rupture. Cerebral mycotic aneurysms have been noted in 2∼10% of cases of bacterial endocarditis and account for 2.5∼6.2% of all intracerebral aneurysms. We have experienced a case of neurologic complication due to infective endocarditis in a 23 year-old female patient, who admitted to our hospital because of fever, chill, headache, myalgia. This case was diagnosed by echocardiography, brain computed tomography. The patient died of sudden intracerebral hemorrhage in the 53th hospital day despite intensive medical treatment. We report one case of intracerebral hemorrhage complicated with infective endocarditis.

기왕 제왕절개 반흔 부위에 착상한 자궁외 임신의 보존적 치료 3례

박선영,박혜인,김윤숙,김종수,최승도,선우재근,배동한 순천향의학연구소 2004 Journal of Soonchunhyang Medical Science Vol.10 No.2

In past decade, ectopic pregnancy developing in the previous cesarean section scar has been the rarest forms of ectopic pregnancy and very dangerous because of the risk of uterine rupture and hemorrhage. These pregnancies once carried a maternal mortality rate of 40% to 45%, and until recent years they usually resulted in abdominal hysterectomy as a life-saving procedure. However, increased awareness of the importance of preserving childbearing capacity has led to several successful attempts at conservative management that include intraamniotic and systemic methotrexate administration, suction curettage followed by insertion of an intracervical 30-mL Foley catheter ballooning and angiographic artery embolization. We present three cases of ectopic pregnancy developing in the previous cesarean section scar in which successfully treated with conservative management.

Penfluridol 투여후 추체외로증상의 출현빈도에 대한 연구

박동건,이정남 朝鮮大學校 附設 醫學硏究所 1986 The Medical Journal of Chosun University Vol.11 No.1

In order to evaluate the frequency of extrapyramidal symptoms induced by long-acting oral antipsychotics, Penfluridal, 48 chronic schizophrenics were subjected in this study. Schizophrenic patients were divided into group A(N=26, 1 week neuroleptics washout periord) and group B (N-22, neuroleptics nonwashout period). Penfluridol of 20 to 100㎎ was administered, racing of exfrapyramidal symptoms was measured by the Rating Scale for Extrapyramidal Symptoms designed by Chien and Dimascio at the interval of 1,2,3,4,5, and 6 week. The results are as follows. 1. Dropout rate due to severe extrapyramidal symptoms was noticed in 6 out of the 48 cases(12.5%). 2. Most common period of occurence of extrapyramidal symptoms in group A is revealed at the 6th week(33.3%) and that in group B is noted at the 3rd week(40.9%) 3. To control extrapyramidal symptoms, when benztropine mesylate was administered orally, the mean days of administration in group A were 21.22±8.45 and those in group B were 11.63±2.50. This difference of mean days between group A and B was highly significant(P < 0.005). In. conclusion, to minimize extrapyramidal symptoms, it is recommended to start the regimen with drug washout period in converting previous antipsychotics medication into penfluridol.

후두결핵의 임상적 고찰

이동건,심우영,조재민,박현민,이진춘,왕수건 釜算慶南耳鼻咽喉科學會 1996 임상이비인후과 Vol.7 No.2

호중구 감소성 발열환자에게 경험적으로 투여한 Teicoplanin의 효과

이동건,임동석,최수미,박선희,유진홍,최정현,민우성,신완식,김춘추 대한감염학회 2004 감염과 화학요법 Vol.36 No.2

목적 : 호중구감소성 발열 환자에게 경험적으로 teicoplanin을 투여할 때의 효과를 알아보고자 전향적 연구를 시행하였다. 방법 : 2003년 7월부터 12월까지 가톨릭조혈모세포이식센터에 입원하여 항암치료 혹은 조혈모세포이식을 시행하고 호중구감소성 발열이 있는 환자 중 초기 항균요법에 반응이 없어 경험적 teicoplanin 투여가 필요한 49명을 대상으로 A, B 제조회사에서 제공한 teicoplanin을 무작위로 어느 한 쪽 치료군에 배정하여 투여하였다. 용량은 첫날 400㎎ 부하용량을 정맥내 bolus로 투여하고 매 24시간마다 200㎎ 유지용량을 투여하였다. 결과 : A군 27명, B군 22명이 연구에 참여하였고 대부분의 환자가 신독성이 있는 약제를 병용하고 있었다. A군 8명, B군 7명에서 그람양성균이 동정되었고, teicoplanin에 대한 내성률은 A군 22.2%, B군 28.6%로 유의한 차이는 없었다(P=1.00; 0.61<95%CI<1.95). 미생물학적 확인 감염이 있었던 환자 중 평균 53.3%에서 완치 혹은 개선의 반응이 있었고 양 군간 유의한 차이는 없었다(A군 4명 [50.0%], B군 4명 [57.1%], P=1.00; 0.29<95%CI<2.60). 미생물학적 제거율은 평균 62.5% (A군 55.6%, B군 71.4%)이었고 그 외 미생물학적 효과는 A군에서 제거 후 재발 2명(22.2%), 내성 2명(22.2%)이었고 B군에서 각각 0명(0.0%), 2명(28.6%)이었으며 양 군간 유의한 차이는 없었다(P=0.28). 발열기간(P=0.89), teicoplanin 사용기간(P=0.47) 및 전체적인 사망률(P=1.00; 0.78<95%CI<1.24)도 양 군간 유의한 차이는 없었다. 이상반응 중 신독성은 16.3% (A군 18.5%, B군 13.6%)에서 나타났고 양 군에 차이는 없었으며(P=0.72; 0.39<95%CI<3.51), 신기능 이상과 관련있는 약제를 적어도 2개 이상 병용하고 있었다. 피부발진은 A군에서 1명, B군에서 3명 발생하였다(P=0.31; 0.93<95%CI<1.34). 결론 : 호중구감소성 발열환자에게 teicoplanin을 투여하였을 때 임상적 반응률은 평균 53.3%(A군 50.5%, B군 57.1%), 미생물학적 제거율은 평균 62.5%(A군 55.6%, B군 71.4%)이었고 두 제조회사간 차이가 없었고 이상반응도 양 군간 차이가 없었다. 앞으로 국내 호중구감소증 환자에서의 teicoplanin의 적정 용량, 용법 등을 알기 위한 집단 약동학 등의 연구를 시행할 예정이다. Background : This study was done to elucidate the efficacy of teicoplanin as the empirical treatment for febrile neutropenia. Methods : Patients were randomized to two groups according to pharmaceutical company (company A or B). Total of 49 patients (A, 27; B, 22) with neutropenic fever were studied prospectively for 6 months (Jul. 2003-Dec. 2003). Patients received 400 mg i.v. once, then 200 mg i.v. once daily. Results : Groups were matched for all demographic variables. Most of the patients were concurrently receiving nephrotoxic drugs. Gram positive microorganisms were isolated in 8 patients for A and 7 patients for B. Resistance rate against teicoplanin was 22.2% in A and 28.6% in B (P=1.0; 0.61 < 95% confidence interval [Cl] < 1.95). Among the patients with microbiologically documented infection, clinical cure or improvement was seen in 4 (50%) of 8 patients for A and 4 (57.1%) of 7 patients for B (P=1.00; 0.29 <95%CI <2.60). Bacteriologic efficacy was assessed as follows; elimination in 5 (55.6%), elimination with relapse in 2 (22.2%), resistance in 2 (22.2%) out of 9 gram-positive bacteria for A and 5 (51.4%), 0 (0.0%), 2 (28.6%) out of 7 bacteria for B, respectively (P=Q.28). There were no significant differences in duration of fever, duration of use of teicoplanin, and overall mortality. The incidence of nephrotoxicity and ototoxicity was not significant. Conclusion : For using teicoplanin as the empirical therapy for febrile neutropenia, the rate of clinical, microbiological response, and nephrotoxicity was 53.3%, 62.5%, and 16.3% respectively with no significant differences between the 2 preparations of teicoplanin. Supplementary evaluation on the adequate dose and duration of teicoplanin may be required.