빔 틸트를 이용한 위성 방송 수신용 다중 대역 안테나 설계 및 구현

박관준,박동국,Park, Kwan-Joon,Park, Dong-Kook 한국정보통신학회 2019 한국정보통신학회논문지 Vol.23 No.3

다광역성과 고효율을 장점으로 하는 위성 통신 기술의 진화함에 따라, 위성 간의 간격과 주파수 자원의 제약으로 인해 보다 효율적인 위성방송 서비스에 대한 요구가 증가하고 있다. 최근에 하나의 리플렉터를 사용하여 동일한 수의 이전 수신 채널을 유지하면서 여러 위성으로 부터 여러 대역의 신호를 동시에 수신할 수 있는 안테나에 대한 연구가 진행되고 있다. 본 논문에서는 위성들로부터 전송되는 Ku band (12 ~ 18GHz) 와 Ka band (18 ~ 30GHz) 위성 신호가 반사체를 통해 반사되어 유입될 때, 단일체로 구성된 3개의 피드 혼을 통합한 하나의 피드 혼으로 구성된 안테나를 제안한다. 안테나 설계 및 특성 시뮬레이션은 상용 프로그램인 TICRA사의 CHAMP와 CST사(社)의 Microwave Studio를 사용하였다. 제작한 안테나는 Ku band 대역과 Ka band 대역에서 각각 -10 dB 이하, 40 dBi 이상의 반사손실 특성과 안테나 이득을 나타내었다. As satellite communication technology with high efficiency and spatiality evolves, demands of customer for efficient and effective satellite broadcasting services are increasing due to interval reduction of the between satellites, and the limited radio-frequency spectrum resources. Recently, research on antenna that it possible to simultaneously receive multiple signal from various satellites while holding maintain the same number of previous reception channels by using the single reflector has been ongoing. It is necessary to be able to simultaneously receive signals from various satellites in order to maintain the same number of previous reception channels. We suggest a multiband antenna which can be simultaneously and independently receiving Ku band and Ka band satellite broadcasting signals transmitted by three adjacent satellites. We have designed and simulated using commercial design tools TICRA CHAMP and CST MWS to meet the target specifications. It appears that the antenna has -10 dB return loss, and more than 40 dBi directivity gain in Ku band and Ka band respectively.

건강행태와 사회계층이 심뇌혈관 질환 유병률에 미치는 영향

박관준,임고운,황보영,장원기 순천향대학교 순천향의학연구소 2011 Journal of Soonchunhyang Medical Science Vol.17 No.2

Objective: The study aimed to determine which factors influence the occurrence of cardio-cerebrovascular diseases. The researchers analyzed differences in health behaviors and social strata according to each type of cardio-cerebrovascular disease, examined regional characteristics and compared the study’s results with the past research data. Methods: In statistical analysis, multiple logistic regression was conducted by utilizing the raw data obtained from the 2010 Chungcheongnam-do Community Health Survey. Results: The results showed that cardio-cerebrovascular diseases were influenced by alcohol consumption, obesity and monthly income. Conclusion: First, education programs and campaigns that maintain an appropriate level of alcohol consumption are needed. Second,in addition to education programs on managing obesity, government policies should encourage physical exercise. Third, government policies should expand health care services and prevention programs for the low-income class, and strengthen health management networks

수소 연료전지시스템

박관준,김두희 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0

최근 미래의 에너지로 각광 받고 있는 수소에 대한 관심이 높아지면서, 수소를 활용하는 여러 장치에 대한 관심이 고조되고 있다. 수소를 사용하는 방법 중에 일반적으로 가정이나 건물에서 수소를 사용하는 장치로서 건물용 연료전지시스템이 있다. 현재의 연료전지 시스템 시장은 건물에 공급되는 LNG 나 LPG를 이용하여 개질 과정을 거쳐 수소를 생산한 후 연료전지 시스템을 통해 전기와 열을 생산하고 건물에 공급하고 있다. 본 강연에서는 수소시스템 설치 사례와 수소를 이용하는 연료전지시스템의 구조와 시스템 특성에 대해 논의하고자 한다.

세종시 정책변경 과정과 지역주민 건강지표의 상관성

박관준,임고운,문종윤,황보영,박윤형 대한의사협회 2012 대한의사협회지 Vol.55 No.5

Recently, Sejong City had been in the center of a policy dispute about city planning in Korea. Although Sejong City was chosen to be a new Multifunctional Administrative City in 2006,politicians continued to challenge the decision at the city level from 2009 upto 2010.This study aims to investigate what influences, such as the policy dispute, impacted the health behaviors and the mental health of local people. We used the survey data from the Community Health Survey in 2008, 2009, 2010, and 2011 and compared the results through logistic regression analysis and direct standardization. Data were gathered from residents in Chungcheongnam-do,the province where Sejong City is located. Data from residents of four other provinces were used as a control: Gangwon-do, Gyeongsangbuk-do, Jeonlanam-do, and Gyeonggi-do. We found a significant increase in smoking and drinking rates in the residents of Chungcheongnamdo,which are indicators of health behaviors, in the year of 2009 when the Sejong City dispute erupted. It appears that controversial changes in government policy could have negative influences on local people. Therefore, we need proper measures to prevent them.

부품 공용화를 통한 시스템 가격 최적화 및 수소 연료전지시스템의 활용

박관준(Kwanjun Park),김두희(Duhee Kim) 한국가스학회 2017 한국가스학회 학술대회논문집 Vol.2017 No.11

능동학습 기반 환자안전을 위한 직군간 교육 - 여러 병원 내 다직종 직원 대상

박관준 ( Kwan Jun Park ),고선희 ( Sun Hee Ko ),어수경 ( Soo-kyung Eo ),김찬웅 ( Chan Woong Kim ),김한솔 ( Han Sol Kim ),최훈화 ( Hun Hwa Choi ),어은경 ( Eun Kyung Eo ) 대한의료커뮤니케이션학회 2020 의료커뮤니케이션 Vol.15 No.2

Background: Patient safety has a direct impact on the patient’s health and life, so all members of the hospital should consider it first. Patient safety accidents are often occured by organizational problems rather than individual medical personnel. Therefore, effective interprofessional collaboration(IPC) among experts is essential, so interprofessional education(IPE) is considered important. Methods : A prospective study method of one-group pretest-posttest design was used that provides IPE using active learning-oriented teaching methods for health workers in various occupations of various hospitals, and evaluates self-efficacy, communication confidence, and attitude toward IPE. Results : 17 trainees from 8 hospitals were evaluated. First, the average of the awareness of patient safety culture was 3.62 points. Next, the score of each indicators increased in the pre-post evaluation. The average of communication confidence was from 3.73 to 3.95 points, self-efficacy was from 3.99 to 4.11 points, and attitude toward IPE was from 4.44 to 4.52 points, but not significant. Conclusions: This study would have a great significance in that it was conducted on health workers in various occupations of various hospitals. As a result of a pre and post education survey conducted with trainees, the score was improved in communication confidence, self-efficacy, and attitude toward IPE. It seems to be due to the use of active learning teaching methods, and the active participation of trainees.

연료전지시스템 부품 공용화를 위한 열회수 장치 개발 및 대응기술 연구

박관준(Kwanjun Park),김두희(Duhee Kim) 한국가스학회 2016 한국가스학회 학술대회논문집 Vol.2016 No.11

멀티형공조시스템의 효과적인 운전을 위한 시스템운전알고리즘

한도영,박관준 대한설비공학회 2006 설비공학 논문집 Vol.18 No.7

A system operating algorithm was developed for the effective operation of a multi-type air-conditioning system. The system operating algorithm includes control algorithms for a safety mode, an initial operating mode, a stabilization mode, a fault diagnosis mode, an efficiency mode, and a tracking mode. Various tests were performed to show the effectiveness of these algorithms. Tests showed good results for the operation of a multi-type air-conditioning system. Therefore, these algorithms developed for this study may be used for the effective control of a multi-type air-conditioning system.

다입력변수를 사용한 멀티형 공조시스템 압축기와 전자팽창밸브의 퍼지 제어 알고리즘

한도영,박관준 대한설비공학회 2006 설비공학 논문집 Vol.18 No.2

In order to control multi-zone temperatures, a multi-type air-conditioning system may be used. In this study, control algorithms for the compressor and the electronic expansion valve of a multi-type air-conditioning system were developed by using fuzzy logics. The compressor control algorithm was composed of a compressor pressure setpoint algorithm, a compressor pressure setpoint reset algorithm, and a compressor frequency setpoint algorithm. The electronic expansion valve control algorithm was composed of an indoor temperature control algorithm, and a superheat control algorithm. These algorithms were applied to a multi- type air-conditioning system. Test showed good results for the control of a multi-type air- conditioning system.

A Trend Analysis of the Prevalence, Awareness,Treatment, and Control of Hypertension by Age Group

문종윤,박관준,황보영,이미리,유병인,원종혜,박윤형 대한예방의학회 2013 예방의학회지 Vol.46 No.6

Objectives: We examined the trends in prevalence, awareness, treatment, and control of hypertension in Korea as a basis for improving hypertension control programs. Methods: 12 598 participants of the Korean National Health and Nutrition Examination Survey were included in this study. Weighted linear regression to test time trends from 2007 to 2011 was performed. Results: The prevalence of hypertension was 20.7% in 2007, 29.4% in 2009, and 26.2% in 2011. Awareness of hypertension was 64.8% in 2007 and 61.1% in 2011. Awareness in those aged 65 and over was greater than in younger groups (age 19 to 44 and 45 to 64; p<0.001). The treatment rates were 58.4% in 2007 and 56.8% in 2011. The treatment rate was greater for those 65 and over than for younger age groups (p<0.001). The percentage of controlled hypertension was 37.6% in 2011. The percentage of controlled hypertension in those 65 and over was higher than in younger age groups (p<0.001). The treatment-control rates were 65.9% in 2007 and 67.7% in 2011. The prevalence of hypertension was higher in the males (p<0.001), while the awareness (p<0.001), treatment (p<0.001), and control (p<0.001) rates were higher in the females. Conclusions: The prevalence of hypertension was increasing and the hypertension awareness, treatment, and control rates were low in younger age groups and males.