델파이 설문조사를 통한 토마토 재배시설 평가지표 개발

유인호(In Ho Yu),조명환(Myeong Whan Cho),이응호(Eung Ho Lee),류희룡(Hee Ryong Ryu),김영철(Young Chul Kim) (사)한국생물환경조절학회 2012 생물환경조절학회지 Vol.21 No.4

이 연구의 목적은 토마토 재배시설을 종합적으로 평가할 수 있는 지표를 개발하는데 있다. 이를 달성하기 위해 관련 문헌 및 선행 연구들을 분석하여 예비 평가항목을 추출하고, 전문가 집단을 대상으로 델파이 설문조사를 실시하여 평가 항목, 등급 및 기준으로 구성된 평가지표를 개발하였다. 토마토 재배 및 시설 관련 교수, 연구원, 농업인(현장 사용자) 등으로 구분하여 100명의 전문가 패널을 선정하였으며, 1차부터 3차까지 폐쇄형 질문 방식의 설문조사를 진행하였다. 그 결과 최종적으로 확정된 평가 항목은 4개 대분류 영역과 39개 세부 평가항목으로 이루어졌다. 대분류 영역은 시설 구조적 요소, 시설 설비적 요소, 재배적 요소, 생산기반적 요소이며, 요소별로 각각 9개, 15개, 7개, 8개씩 세부 평가항목으로 구성되었다. 또한 전문가 의견을 수렴하여 39개 평가항목별로 가중치를 산정하고, 등급 및 기준을 설정하였다. 이 연구에서 개발된 평가지표는 새로운 시설 모델 개발, 사용 중인 시설에서 우선적으로 보완해야 될 사항을 판단하거나 정부 지원사업의 효율성을 높이는데 중요한 역할을 할 것이다. This study aimed to develop the comprehensive indicators which can be used for evaluating greenhouse for tomato cultivation. To achieve this aim, the study developed the evaluation indicators composed of evaluation items, grades and criteria by extracting preliminary evaluation items through analyzing the related papers and preceding studies, and conducting Delphi survey on an expert group. During the three surveys, the questions of closed-ended type were given to a panel of 100 experts - professors related to tomato cultivation and facilities, researchers and farmers (practical users). As a result, the finally established evaluation indicators consist of 4 categories and 39 specific evaluation items. The 4 categories are the structural factor of greenhouse, equipment factor of greenhouse, cultivation factor, and infrastructure factor. These factors consist of specific evaluation items of 9, 15, 7 and 8, respectively. In addition, on 39 specific evaluation items, weighted values were calculated and grades and criteria were established by collecting opinions of the experts. The newly developed evaluation indicators through this study will play an important role in developing new greenhouse models, considering things that should be complemented preferentially regarding in-use facilities, and improving the efficiency of projects supported by the government.

지붕 환기팬이 설치된 단동 플라스틱 온실에서 개선된 측창형태가 하우스 내 온도 및 참외 수량에 미치는 영향

유인호(In Ho Yu),조명환(Myeong Whan Cho),류희룡(Hee Ryong Ryu),신영안(Young An Shin) (사)한국생물환경조절학회 2017 생물환경조절학회지 Vol.26 No.4

본 연구에서는 저온기에 참외재배 단동 플라스틱 온실에서 지붕 환기팬을 이용하여 환기할 때 작물에 스트레스를 적게 주면서 바깥 공기를 하우스 내부로 균일하게 유입할 수 있는 방법으로 하우스 전체길이에 대해 측창 안쪽부분에 비닐을 부착하는 방법을 개발하였다. 지면으로부터 측창이 최대한 열렸을 때 높이의 10cm 아래까지 비닐을 설치하였다. 측창 개선에 의한 온실 환경 개선 및 참외 수량증대 효과를 검증하기 위하여 개선 측창형태와 관행의 측창형태를 비교하였다. 2017년 2월 25일 까지는 두 시험구 모두 환기를 하지 않았는데, 2월 중순 하우스 내 기온이 40℃를 넘어섰다. 따라서 2월 중순부터는 하우스 환기를 시작해야 할 것으로 판단된다. 대조구에서의 기온이 4월 하순부터 30℃를 넘어섰다. 그러므로 측창 안쪽에 부착한 비닐을 4월 하순, 늦어도 5월 상순에는 제거해야 할 것으로 판단된다. 4월 중순에 처리구에서의 지온은 생육 적온 범위인 20℃를 넘어선데 비해 대조구에서는 여전히 20℃보다 낮게 나타났다. 4월 하순이 되어서야 대조구의 지온도 20℃를 넘어서는 것으로 나타났다. 전기사용량은 처리구 47.2kWh, 대조구 48.3kWh로 처리 간에 큰 차이를 보이지 않았다. 처리구에서의 참외 상품수량은 5,094kg으로 대조구 4,113kg에 비해 23.9% 많았다. 상품과율은 처리구 73.5%, 대조구 73.9%로 차이가 없었다. In this study, the method to attach plastic film on the side vent from inside of greenhouse for the entire length was developed as the way to make crops less stressful while uniformly getting outside air into the greenhouse when ventilating using roof ventilation fans at single-span plastic greenhouse for oriental melon in a low-temperature period. The plastic film was installed from ground to 10cm below from the height where side vent is fully opened. In order to verify that the improved side vent can improve greenhouse environment and fruit yield, it was compared with the control plot of conventional side vent. Both greenhouses were not ventilated until February 25th, 2017. Air temperature in both greenhouses exceeded 40℃ in mid February. Therefore, it is judged that the greenhouse should be ventilated from mid February. Air temperature in the control plot exceeded 30℃ from late April. Therefore, it is judged that the plastic film attached to the inside of side vent should be removed in late April, or in early May at the latest. Soil temperature in the treatment plot in the mid Aril exceeded 20℃, which is suitable for growth, while that in the control plot was still below 20℃. Soil temperature in the control plot finally exceeded 20℃ in late April. The consumption of electricity was 47.2 kWh in the treatment plot, and 48.3 kWh in the control plot, which was no significant difference. The marketable yield of oriental melon in the treatment plot was 5,094kg, which was 23.9% more than that in the control plot, 4,113kg. The marketable fruit ratio was 73.5% in the treatment plot, and that in the control plot was 73.9%, which was no significant difference.

연동온실 내 위치별 일사량에 따른 토마토의 생육 및 수량 비교

신현호(Hyun Ho Shin),최만권(Man Kwon Choi),류희룡(Hee Ryong Ryu),조명환(Myeong Whan Cho),김진현(Jin Hyun Kim),서태철(Tae Cheol Seo),유인호(In Ho Yu),김승유(Seung Yu Kim),이충근(Choung Kuen Lee) (사)한국생물환경조절학회 2022 생물환경조절학회지 Vol.31 No.4

본 연구에서는 연동온실의 골조로 인한 내부 광 분포를 검토하기 위하여 위치별(중앙부 및 측면부) 일사량을 실측하고, 오전(08:30-12:30)과 오후(12:35-16:30)로 시간대를 구분하여 일사량, 광 투과율 및 일 적산일사량을 분석하였다. 또한 토마토의 생육 및 수확량을 위치별로 비교하였다. 오전일 때 중앙부와 측면부의 일사량은 각각 275.2W·m<SUP>-2</SUP>, 314.9W·m<SUP>-2</SUP>이고, 오후일 때는 각각 278.1W·m<SUP>-2</SUP>, 313.9W·m<SUP>-2</SUP>로 측면부 보다 중앙부가 오전은 12.6%, 오후는 11.4% 낮았고, 광 투과율과 일 적산일사량도 중앙부가 낮게 나타났다. 생육 특성에 있어서는 첫 번째 조사의 엽장과 엽폭을 제외하고는 조사 종료일까지 유의미한 차이가 없었다. 토마토의 최종 주당 평균수확량은 재배 위치에 따라 중앙부 4,828g, 측면부 4,851g으로 유의미한 차이는 없었고, 중앙부가 0.5% 적게 나타났다. 토마토의 광보상점은 60W·m<SUP>-2</SUP>이고 광포화점은 281W·m-2로 중앙부의 시간대별 일사량은 광보상점보다는 높고, 광포화점 보다는 낮으나 그 차이가 크지 않아 온실 내 위치에 따른 생육 및 수확량의 차이가 미미한 것으로 판단하였다. 향후 이 검토결과를 포함하여 온실을 설계할 때 광 환경을 고려한 설계를 위해 온실의 설치 방향, 위치 및 지붕 경사도 등에 따른 온실 내 광 분포 분석이 필요하다. To examine the distribution of internal solar radiation within various locations in multi-span greenhouses, the solar radiation, light transmittance, and accumulated radiation at the central and lateral sections were analyzed by dividing 8:30 to 12:30 in the morning and 12:35 to 16:30 in the afternoon. The growth and yield of tomatoes within these sections were also compared. In the morning, the solar radiation of the central section and the side section was 275.2 W·m<SUP>-2</SUP> and 314.9 W·m<SUP>-2</SUP>, while in the afternoon, it was 314.9 W·m<SUP>-2</SUP> and 313.9 W·m<SUP>-2</SUP>, respectively. The light transmittance and accumulated radiation were also low, confirming the low distribution of solar radiation in the central (connecting) section of the multi-span greenhouses. The growth survey revealed no significant difference. The final yield of tomatoes per plant was 4,828 g in the central section and 4,851 g in the lateral section, but there was no significant difference in the central section compared to the lateral section by 0.5%. However, the amount of solar radiation as per time in the central section is higher than the light compensation point, 60 W·m<SUP>-2</SUP>, and slightly lower than the light saturation point of tomatoes, i.e., 281 W·m<SUP>-2</SUP>. The results of this study can help in greenhouse design based on the insolation environment.

간척지에 플라스틱 온실 설치 시의 문제점 분석 및 개선방안

유인호(In-Ho Yu),구양규(Yang-Gyu Ku),조명환(Myeong-Whan Cho),류희룡(Hee-Ryong Ryu),문두경(Doo-Gyung Moon) 충남대학교 농업과학연구소 2014 농업과학연구 Vol.41 No.4

Upon setting up a dedicated plastic greenhouse for tomato cultivation developed by the Rural Development Administration on the Gyehwa reclaimed land, this study was aimed at analyzing the problems can be occurred in the installation of plastic greenhouse on reclaimed lands as well as finding out solutions for improvement. A relatively cheaper wooden pile was used in the installation in order to supplement the soft ground conditions. Based on the results of ground investigation of the installation site, both the allowable bearing capacity and pulling resistance of the wooden pile with a diameter of 150 mm and a length of 10 m were computed and came out to be 30.645 kN. It was determined that the values were enough to withstand the maximum compressive force (17.206 kN) and the pullout force (20.435 kN) that are generally applied to the greenhouse footing. There are three problems aroused in the process of greenhouse installation, and the corresponding countermeasures are as follow. First, due to the slightly bent shape of the wooden pile, there were phenomenon such as deviation, torsion, and fracture when driving the pile. This could be prevented by the use of the backhoe (0.2) rotating tongs, which are holding the pile, to drive the pile while pushing to the direction of the driving and fixing it until 5 m below ground and applying a soft vibrating pressure until the first 2 m. Second, there exists a concrete independent footing between the column of the greenhouse and the wooden pile driven to the underground water level. Since it is difficult to accurately drive the pile on this independent footing, the problem of footing baseplate used to fix the column being off the independent footing was occurred. In order to handle with this matter, the diameter of the independent footing was changed from 200 mm to 300 mm. Last, after films were covered in the condition that the reinforcing frame and bracing are not installed, there was a phenomenon of columns being pushed away by the strong wind to the maximum of 11 m?s-1. It is encouraged to avoid constructions in winter, and the film covering jobs always to be done after the frame construction is completely over. The height of the independent footing was measured for 9 months after the completion of the greenhouse installation, and it was found to be within the margin of error meaning that there was no subsidence. The extent to the framework distortion and the value of inclinometers as well showed not much alteration. In other words, the wooden pile was designed to have a sufficient bearing capacity.

LED 램프의 특성 분석을 통한 전기안전 관리 방안에 관한 연구

이기연(Ki-Yeon Lee),문현욱(Hyun-Wook Moon),김동우(Dong-Woo Kim),임용배(Young-Bea Lim),유인호(In-Ho Ryu) 대한전기학회 2016 전기학회논문지 Vol.65 No.11

In this paper, we analyzed causes of accidents that recently increased in the illegal and defective LED lamps. They were analyzed by the electrical characteristics calculation and reappearance experiments. The causes of the accidents were analyzed from the circuit affected by the variation of voltage, current and power by harmonics. We drew a conclusion for electrical safety in illegal or degraded LED lamps from the analysis result. The management factors for electrical safety in LED lamps were harmonics, reactive power and power factor. It is possible to secure the electrical safety through monitoring of power factor in failure products and available in smart meters or smart distribution boards.

채널선택용 필터를 위한 전압 안정화 회로 설계

유인호(Ryu, In-Ho),이우춘(Lee, Woo-Choun),방준호(Bang, Jun-Ho),조현섭(Cho, Hyeon-Seob) 한국산학기술학회 2008 한국산학기술학회논문지 Vol.9 No.5

채널 선태용 필터의 전압오차를 보정하기 위해 전류비교 방식의 전압안정화 회로를 설계하였다. 제안된 전류비교 방식의 전압안정화 회로는 부속회로를 첨가 할 필요가 없어 칩 면적을 최소화 할 수 있고 저전압 저전력용 채널 선택용 필터 설계에 매우 유용하다. 제안된 안정화 회로의 응용 회로로써 블루투스 통신 시스템 채널을 포함한 3개의 통신채널을 이용하였다. 0.18㎛ CMOS 공정파라메터를 사용하여 HSPICE 시뮬레이션 한 결과, 제안된 안정화 회로는 3개의 통신 채널에서 각각 l2㎛, 13㎛, 15㎛이내에서 동작할 수 있음을 확인하였다. To compensate voltage error of the channel selecting filter, a current comparison type voltage tuning circuit is designed. Because the proposed current comparison type voltage tuning circuit is not need to attach another subcircuit, the chip size can be reduced, therefore the proposed circuit is very useful in the low voltage and low power channel filter. We used three channels including bluetooth communication system as application circuits of the proposed tuning circuit. As the results of HSPICE simulation using 0.18㎛ CMOS technology verify that the proposed tuning circuit respectively can be operated in 12㎛, 13㎛ and 15㎛ in three channel.

DC정합회로를 갖는 능동 Replica LDO 레귤레이터

유인호(Ryu, In-Ho),방준호(Bang, Jun-Ho),유재영(Yu, Jae-Young) 한국산학기술학회 2011 한국산학기술학회논문지 Vol.12 No.6

본 논문에서는 DC 정합회로를 갖는 능동 Replica LDO 레귤레이터에 대하여 나타내었다. Replica단과 출력 단의 DC전압을 정합하기 위하여 DC정합회로를 설계하였다. 능동 Replica LDO 레귤레이터의 PSR특성은 일반적인 레귤레이터 보다 큰 값을 가질 수 있다. 설계된 DC정합회로는 Replica 레귤레이터에서 발생할 수 있는 단점을 줄여 준다. 또한 전체회로를 능동회로로 설계함으로써 칩면적을 줄이고 수동저항을 사용할 때 발생하는 열잡음을 제거할 수 있다. 0.35um CMOS 파라미터를 사용하여 HSPICE 시뮬레이션한 결과, DC정합회로를 이용하여 설계된 레귤레이 터의 PSR특성은 -28dB@10Hz로써 DC정합회로를 사용하지 않는 일반적인 레귤레이터의 -17dB@10Hz보다 개선될 수 있음을 확인하였다. 레귤레이터의 DC출력 전압은 3V이다. In this paper, an active replica Low-dropout(LDO) regulator with DC voltage matching circuit is presented. In order to match the voltage between replica and output of regulator, DC voltage matching circuit is designed. The active replica low dropout regulator has higher Power Supply Rejection(PSR) than that of conventional regulator. The designed DC voltage matching circuit can reduce the drawback that may be occurred in replica regulator. And using fully active element in regulator can reduce the chip area and heat noise with resistor. As results of HSPICE simulation with 0.35um CMOS parameter, the designed active replica LDO regulator achieves Power Supply Rejection, -28@10Hz better than -17@10Hz of conventional replica regulator without DC matching circuit. And the output voltage is 3V.

CMOS 저전압 전류모드 적분기의 이득 및 주파수 특성 개선

유인호(Ryu, In-Ho),송제호(Song, Je-Ho),방준호(Bang, Jun-Ho) 한국산학기술학회 2009 한국산학기술학회논문지 Vol.10 No.12

본 논문에서는 이득 및 주파수 특성이 개선된 CMOS 저전압 전류모드 적분기가 설계되었다. 설계된 전류모 드 적분기는 본 논문에서 새롭게 제안한 선형 캐스코드 회로를 기본으로 구성되었다. 제안된 전류모드 적분기는 기존 의 전류미러형 전류모드 적분기의 이득(43.7dB) 및 단위이득주파수(15.2MHz) 비해서 높은 전류이득(47.8dB) 및 단위 이득 주파수(27.8MHz)의 특성을 얻을 수 있었다. 제안된 전류모드 적분기의 응용회로로써 차단주파수 7.03MHz를 갖 는 5차 체비세프 저역통과 필터를 설계하였다. 설계된 모든 회로들은 1.8V-0.18㎛ CMOS 공정파라메터로써 HSPICE 를 이용하여 시뮬레이션되었다. In this paper, A CMOS low-voltage current mode integrator is designed. The designed current-mode integrator is based on linear cascode circuit that is newly proposed in this paper. When it is compared with gain(43.7dB) and unity gain frequency(15.2MHz) of the typical current-mirror type current-mode integrator, the proposed linear cascode current-mode integrator achieves high current gain(47.8dB) and unity gain frequency(27.8MHz). And a 5th Chebyshev current-mode filter with 7.03MHz cutoff frequency is designed. The designed all circuits are simulated by HSPICE using 1.8V-0.18㎛ CMOS technology.

제3발표장 : 정보처리 및 복합기술 분야 ; 웹 기반 토마토 재배시설 평가시스템 개발

유인호 ( In Ho Yu ),조명환 ( Myeong Whan Cho ),류희룡 ( Hee Ryong Ryu ),이응호 ( Eung Ho Lee ),문두경 ( Doo Gyung Moon ) 한국농업기계학회 2013 한국농업기계학회 학술발표논문집 Vol.18 No.1

선외기 선박용 비접촉 러더센서 및 자동조향장치 개발

김호영(Ho-Young Kim),방준호(Junho Bang),김태형(Tae-Hyung Kim),유인호(In-Ho Ryu) 대한전기학회 2017 전기학회논문지 Vol.66 No.8

In this paper, we developed a core module of the steering system to control and operate the outboard ship with the automatic steering system, and implemented it as a complete integrated system. In particular, this paper presents the problem of the rudder sensor used in the existing system and implements the contactless rudder sensor as an improvement. In the case of existing rudder sensors, there is a problem that safety operation and economic loss of the ship operation is caused by malfunction due to immersion during use in outboard vessels. However, the proposed rudder sensor is separated from the rotary shaft to constitute a contactless type, and a circular magnet is fixed so that the rotating value can be detected and used by the Hall sensor to completely solve the flooding problem. As a result of the characteristic test, the voltage value from 1.8V to 3.2V was obtained between -35° and +35° degrees and satisfied the reference value. The proposed rudder sensor was mounted on the outboard ship, and all the performance of controller system were checked. According to the system proposed in this paper, it satisfies the Korean Standard Specification, which defines the speed of convergence in 30 seconds by switching from left to right in 7 seconds. We also confirmed that automatic steering was performed by comparing the compass sensor with the destination in the integrated controller at the start-up.