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장문기,리신호,Jang, Moon-Ki,Yulong, Zhang,Zailin, Piao,Rhee, Shin-Ho The Korean Society of Agricultural Engineers 2008 한국농공학회논문집 Vol.50 No.3
The economics of a passive solar heating system (PSHS) with the pebble bed heat storage was evaluated, and the applications of the PSHS were analyzed, in this study. The results are as follows: The heating load, solar heat gain, and stored heat/year of the PSHS in the solar house model were found to be 10,778MJ, 3,438MJ, and 11,682MJ, respectively. The yearly energy expenses of the PSHS and the alternative heating system (conventional coal heating system, CCHS), which uses coal, were found to be USD 1.60/year and USD 60.90/year, respectively, and the yearly expenses of the PSHS were found to be 38 times less than those of the alternative heating system (CCHS). If it will be supposed that the life cycle of the passive solar heating system, according to the results of the LCC analysis in the two systems, is 40 years, the total expenses for the life cycle of the PSHS and the CCHS will be USD 1,431.50 and USD 2,740.00, respectively. The period for the investment payback of the PSHS is six years.
수정발진자를 이용한 NAVTEX 수신기용 협대역 여파기 설계
장문기,안중수,박진수,Jang, Moon-Kee,Ahn, Jung-Soo,Park, Jin-Soo 한국정보통신학회 2008 한국정보통신학회논문지 Vol.12 No.5
This paper evaluate the performance using a simulated 490KHz narrow band filter based on characteristic parameters appropriately extracted from 490KHz band-pass filter after considering each characteristic, which is modeled on equivalent circuit and applied to NAVTEX receiver using crystal oscillator. The evaluation results show that the value of a series capacitor of crystal oscillator has only little capacity by Cs=21.094fF and the bandwidth characteristics of filter go worse as the capacity value of crystal oscillator grow increase. Moreover, the series inductance value of crystal oscillator has a relatively big value by L=5H, therefore the bandwidth characteristic according as inductance's capacity shows more little effect than the capacity. 본 논문에서는 수정 발진자를 이용하여 NAVTEX 수신기에 적용 가능한 490KHz 대역여파기를 등가회로로 모델화하고 컴퓨터로 시뮬레이션한 후, 각각의 특성에 알맞은 특성 파라미터를 추출하고 이를 바탕으로 490KHz 협대역 여파기를 제작한 후 성능을 평가하였다. 그 결과, 수정 발진자의 직렬 커패시터 값은 $C_s{\fallingdotseq}21.094fF$로 매우 작은 용량값을 나타내야하며 제작된 수정 발진자의 용량값 편차가 크면 클수록 필터의 대역폭 특성이 나빠지는 결과를 알 수 있었다. 또한 수정발진자의 직렬 인덕턴스 값은 $L{\fallingdotseq}5H$정도의 비교적 큰 값을 나타내므로 인덕턴스의 용량 변화에 따른 대역폭 특성은 커패시터의 영향보다 비교적 적음을 알 수 있었다.
장문기 ( Jang Moon Ki ),이정재 ( Lee Jeong Jae ),윤성수 ( Youn Seong Soo ) 한국농공학회 1999 韓國農工學會誌 : 전원과 자원 Vol.41 No.6
This paper present the strength estimation of precast concrete products by chloride ion penetration method. The relation between the strength of precast concrete product and the ion passing charge is linear and a numerical model of F<sub>ck</sub>=515.96-0.201Q. is proposed. The results show good agreement at about 9.0% error ratio with the estimated model results for real precast concrete product.
증기양생조건이 시멘트 모르타르의 동결융해저항성에 미치는 영향
장문기 ( Jang Moon Ki ),박광수 ( Park Kwang Su ),김관호 ( Kim Kwan Ho ),윤성수 ( Yoon Seong Soo ) 한국농공학회 2001 한국농공학회 학술대회초록집 Vol.2001 No.-
In this study, the characteristics of freezing and thawing resistance, the compressive strength, and the change in height of cement mortar according to a steam and later curing conditions has been studied. To this end, the major test variables include the period of the early curing, curing temperature and the later curing. The strength test as well as volume variousness have been conducted to explore the characteristics of freezing and thawing resistance on the curing conditions. The experimental results can be efficiently used to improve the characteristics of freezing and thawing resistance for concrete products carrying steam curing.
기반 기술 : WCDMA-LTE 기반의 Smart HACCP 시스템 구축을 위한 단말기 개발에 관 한 연구
장문기 ( Moon Kee Jang ),박진수 ( Jin Soo Park ) 한국항행학회 2014 韓國航行學會論文誌 Vol.18 No.5
본 논문에서는 초·중·고등학교의 급식과 관련하여 학생들의 식중독 사고를 예방하기 위해 급식소의 냉·온장고 및 각종 주방 기기의 온도와 습도를 모니터링하여WCDMA-LTE 망을 이용하는 스마트HACCP 시스템을 제안한다. 단말기로부터 수집된 데이터는 특정서버로 전송되며 더욱 안전한 식품을 제공하기위해 식중독지수와 비교된 후,단말기가 설치된 장소의 식중독지수를LCD화면에 표시하도록 한다.이러한 시스템을 구현하는데 있어 주요 요소가WCDMA-LTE 망 기반의 온습도 측정 및 모니터링 시스템 전용 단말기이다. 따라서 본 논문에서는 다른 단말기와 상호 통신이 가능하도록 424 MHz 및 블루투스 4.0 무선모뎀을 포함한 LTE 단말기를 설계하고 구현하였다. 향후 본 시스템은 비닐하우스의 온도감시 시스템 또는 원격 환경감시 시스템으로의 적용이 가능하다. To protect the students fromfood poisoning, in this paper, it is proposed that the Smart HACCP systemwhich basedwithWCDMA-LTE to monitoring the temperature and humidity of a freezer, a heating cabinet and kitchen instruments at the elementary, junior and high school. After gathering the data, It is compared with a standard food poisoning index to provide more safe food reserves from the server. Then the server send a index to the terminal which is installed in a kitchen at any school to show the current environment. It is need an WCDMA-LTE terminal to realize smart HACCP system that is proposed from this paper. So, the proposed WCDMA-LTE terminal is designed with using a LTEmodem included a 424MHz wireless modem and a bluetooth 4.0 modemto communicate with other terminals. It can be use the monitoring system of a plastic greenhouse or remotely environment control system.