대학에서 비교과영역의 만족요인에 관한 연구

문성동 ( Sung Dong Moon ),엄기수 ( Kee Soo Eum ) 한국경영공학회 2015 한국경영공학회지 Vol.20 No.1

The purpose of this study is to comprehend the requirement and satisfactory level for extra- curriculum intimately related with collegiate environment for the students enrolled in domestic universities and to classify data by quality characteristics based on Kano model. Drawing up a plan will be shown to improve satisfaction in extracurricular through an approach to concept of customer satisfaction. As a study method, it have formed a Kano survey with seven different extra-curriculums such as transportation, welfare facilities, learning support system, human relations, scholarship, recruitment support system, and public welfare based on advanced research. This survey conducted to 400 students in universities. We analyzed data to customer satisfaction coefficient and total customer satisfaction coefficient with Kano quality analysis. First, various as average level, institutional improvement of extra-curricular area is needed by overall satisfaction of respondent`s college life. Second, although characteristics of quality are appeared from Kano analysis result, additional analysis is needed because of many appearance of single and charming characteristics of quality as second mode factor. Third, quadrant chart is presented as the analysis result that throughout Timko`s ‘customer satisfaction factor’ and priority is also presented to improve satisfaction or dissatisfaction factors. Fourth, the result as the comparison analysis, there are classified by single quality or charming quality again. These potential possibilities seem to valuable as control factors to increase the level of quality of college life. Fifth, although the result of correlation analysis shows less significant relationship, some factors show strong relationship between satisfaction and dissatisfaction. In conclusion, in extra-curricular area factors we can classify in quality characteristic through the result of this study, we suggested necessity of institutionalization through drawing factors with potential possibility of improvement.

온실용 얕은기초의 인발저항력 검토

윤성욱(Sung Wook Yun),최만권(Man Kwon Choi),이시영(Si Young Lee),강동현(Dong Hyeon Kang),문성동(Sung Dong Moon),유찬(Chan Yu),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.3

본 연구에서는 내재해형 플라스틱 온실과 유리온실의 기초에 대하여 인발저항력을 검토하기 위해 사질토 지반에서 실규모로 제작한 총 15개의 온실 기초를 이용하여 현장시험을 실시하였다. 그 결과, 대상 온실 기초의 최대인발저항력은 기초의 형태 및 규모가 서로 상이함에 따라 11.6 kN~82.4kN의 범위로 나타났다. 온실기초의 최대인발저항력 산정을 위해 제안된 이론식에 대하여 현장시험 결과를 이용하여 적용성을 검토한 결과 전반적으로 기존의 산정 이론식이 현장시험결과와 근접하는 수치를 제공하는 것으로 검토되었다. 다만, 본 연구에서 고려한 지반은 사질토 지반이며, 향후 점성토지반에 대하여 기존의 인발저항력 산정 이론식의 검증이 필요할 것으로 판단된다. In this study, a field test of uplift load was carried out using 15 greenhouse foundations fabricated in full scale on a sand soil to examine the uplift capacity of plastic film greenhouse and glasshouse foundations for disasterproof standard. As a result, the maximum uplift capacity of the target greenhouse foundations was shown to be in the range from 11.6kN to 82.4kN according to the differences between the forms and sizes of the foundation. As a result of the examination of the applicability using the field uplift load test result of the theoretical equation proposed for maximum uplift capacity calculation of greenhouse foundations, we found that in general, the conventional theoretical equation for the calculation provided numerical values close to the field test results. However, the soil considered in this study was a sand; thus, in the future, verifying the conventional theoretical equation for the uplift capacity calculation of a cohesive soil would be necessary.

온실 구조용 파이프의 부식속도 검토

윤성욱(Sung-Wook Yun),최만권(Man Kwon Choi),이시영(Si Young Lee),문성동(Sung Dong Moon),윤용철(Yong Cheol Yoon) (사)한국생물환경조절학회 2015 생물환경조절학회지 Vol.24 No.4

간척지 내 토양은 염분농도 및 함수비가 일반지역에 비해 상당히 높기 때문에 간척지에 매입된 온실의 부재는 높은 부식 환경에 노출된다. 염해의 환경에서는 파이프 골조로 이루어진 온실의 기초 및 기초와 이어진 파이프에 부식을 촉진시키기 때문에 이에 대한 보수/보강 기술개발 및 효율적인 유지 관리가 필요하다. 본 연구에서는 염해의 위험성이 높은 간척지에 적합한 온실의 유지관리, 보수/보강에 대한 기준을 마련하기 위한 기초자료로서 토양염분환경에서 온실부재의 부식속도를 측정하였다. 각 온실파이프는 염분농도가 0%, 0.1%, 0.3% 및 0.5%인 토양 및 수중환경에 관찰기간동안(480일) 노출시켜 부식속도를 측정하였으며, 그 결과 육안으로도 염분농도에 따른 부식정도의 차이가 뚜렷하게 관찰되었으며, 시험편의 표면이 검은색의 부식현상과 함께 비교적 고르게 부식되는 균일부식의 형태를 나타내었다. 논토양의 경우 염분농도 0, 0.1, 0.3, 0.5%에서 각각 0.008, 0.027, 0.036, 0.043mm·yr<SUP>-1</SUP>로 염분농도가 증가할수록 부식속도가 뚜렷하게 증가하는 경향을 나타내었고 밭토양의 경우, 염분농도 0, 0.1, 0.3, 0.5%에서 각각 0.0002, 0.039, 0.040, 0.039mm·yr<SUP>-1</SUP>의 부식속도를 나타내었다. 상대적으로 세립질이 많은 논토양에서 부식속도가 더 높은 것으로 나타났으며, 이는 입경이 작고 고르게 분포하는 토양에서 부식속도가 높은 일반적인 특성이 그대로 반영된 것으로 판단되었다. 간척지의 경우 토양의 입자의 세립 정도는 일반 내륙지역의 농경지 토양보다 높을 것으로 예상되기 때문에 파이프 부식에 대한 철저한 대비가 있어야 할 것으로 판단되었다. Because soils in reclaimed lands nearby coastal areas have much higher salinity and moisture content than soils in inland area, parts of greenhouses embedded in such soils are exposed to highly corrosive environments. Owing to the accelerated corrosion of galvanized steel pipes for substrucrture and structure of greenhouses in saline environments, repair and reinforcement technologies and efficient maintenance and management for the construction materials in such facilities are required. In this study, we measured the corrosion rates of the parts used for greenhouse construction that are exposed to the saline environment to obtain a basic database for the establishment of maintenance and reinforcement standards for greenhouse construction in reclaimed lands with soils with high salinity. All the test pipes were exposed to soil and water environments with 0, 0.1, 0.3, and 0.5% salinity during the observation period of 480 days. At the end of the observation period, salinity-dependent differences of corrosion rate between black-surface corrosion and relatively regular corrosion were clearly manifested in a visual assessment. For the soils in rice paddies, the corrosion growth rate increased with salinity (0.008, 0.027, 0.036, and 0.043mm·yr<SUP>-1</SUP> at 0, 0.1, 0.3, and 0.5% salinity, respectively). The results for the soils in agricultural fields are 0.0002, 0.039, 0.040, and 0.039mm·yr<SUP>-1</SUP> at 0, 0.1, 0.3, and 0.5% salinity, respectively. The higher corrosion rate of rice-paddy soil was associated with the relatively high proportion of fine particles in it, reflecting the general tendency of soils with evenly distributed fine particles. Hence, it was concluded that thorough measures should be taken to counteract pipe corrosion, given that besides high salinity, the soils in reclaimed lands are expected to have a higher proportion of fine particles than those in inland rice paddies and agricultural fields.

비점오염원 저감을 위한 봉산 인공습지의 오염물질 정화효율 평가

최익원(Ik-Won Choi),문성동(Sung-Dong Moon),서동철(Dong-Cheol Seo),강세원(Se-Won Kang),임병진(Byung-Jin Lim),박종환(Jong-Hwan Park),김갑순(Kap-Soon Kim),이준배(Jun-Bae Lee),허종수(Jong-Soo Heo),조주식(Ju-Sik Cho) 한국토양비료학회 2011 한국토양비료학회지 Vol.44 No.6

주암호 상수원 상류지역인 송광천에 위치한 봉산 인공습지의 수생태학적 효율 향상을 위한 관리 방안을 제시하기 위하여 시기별, 처리단계별 및 오염물질 부하량별 수처리 효율을 평가하였다. 유입원수의 BOD, SS, T-N 및 T-P의 평균 함량은 1.87 mg L<SUP>-1</SUP>, 1.62 mg L<SUP>-1</SUP>, 11.47 mg L<SUP>-1</SUP> 및 4.40mg L<SUP>-1</SUP>이었으며, 연평균 처리효율은 BOD, SS, T-N 및 T-P가 각각 26%, 18%, 16% 및 9%로서 전반적으로 처리효율이 낮았으나 유입수 농도가 높아서 오염물질의 제거량은 매우 높은 편이었다. 인공습지 처리단계별 BOD, SS, T-N 및 T-P 변화를 조사한 결과는 모든 항목에서 침강지의 처리효율이 가장 높았고 BOD와 T-P는 습지 II 〉 습지 I, SS와 T-N은 습지 I 〉 습지 II 순으로 처리효율이 높았다. 인공습지 구성시스템별 오염물질 부하량에 따른 오염물질 처리량은 BOD는 침강지 〉 습지 I 〉 습지 II, SS는 침강지 〉 습지 II 〉 습지 I, T-N은 습지 I 〉 침강지 〉 습지 II, T-P는 습지 II 〉 침강지 〉 습지 I 순으로 높았다. To treat non-point source pollution in Juam lake, removal efficiencies of pollutants were investigated in Bongsan constructed wetlands (CWs) at different treatment time, stages and wastewater loads. The constructed wetlands consisted of forebay, 1<SUP>st</SUP> and 2<SUP>nd</SUP> wetlands. The concentrations of BOD, SS, T-N, and T-P in inflow were 1.87 mg L<SUP>-1</SUP>, 1.62 mg L<SUP>-1</SUP>, 11.47 mg L<SUP>-1</SUP>, and 4.40 mg L<SUP>-1</SUP>, respectively. The removal rates of BOD, SS, T-N, and T-P in Bongsan CWs were 26, 18, 16 and 9%, respectively. The removal rates of BOD and T-N were higher than those for SS and T-P. The amounts of pollutant removal in Bongsan CWs were higher in the order of forebay 〉 1<SUP>st</SUP> wetland 〉 2<SUP>nd</SUP> wetland for BOD, forebay 〉 2<SUP>nd</SUP> wetland 〉 1<SUP>st</SUP> wetland for SS, 1<SUP>st</SUP> wetland 〉 forebay 〉 2<SUP>nd</SUP> wetland for T-N and 2<SUP>nd</SUP> wetland 〉 forebay 〉 1<SUP>st</SUP> wetland for T-P.

식물공장 자동화를 위한 공압 실린더를 이용한 육묘베드 이송장치의 이송력 특성

민영봉 ( Young Bong Min ),박상민 ( Sang Min Park ),이공인 ( Gong In Lee ),김동억 ( Dong Ouk Kim ),강동현 ( Dong Hyun Kang ),문성동 ( Sung Dong Moon ) 한국농업기계학회 2012 바이오시스템공학 Vol.37 No.3

This study was performed to offer the data for design of the seedling bed transfer equipment to make the automation of working process in a plant factory. The seedling bed transfer equipment pushing the seedling bed with bearing wheels on the rail for interconnecting each working process by a pneumatic cylinder was made and examined. The examined transfer force to push the seedling bed with a weight of 178.9 N by the pneumatic cylinder with length of 60 cm and section area of 5 cm2 was measured by experiments. The examined transfer forces was compared with theoretical ones calculated by the theoretical formula derived from dynamic system analysis according to the number of the seedling bed and pushing speed of the pneumatic cylinder head at no load. The transfer function of the equipment with the input variable as the pushing speed Vho(m/s)and the output variable as the transfer force f(t)(N) was represented as F(s)=(Vho/k)(s+B/M)/)(s(s2+Bs/M+1/(kM)) where M(㎏), k(m/N)and B(Ns/m) are the mass of the bed, the compression coefficient of the pneumatic cylinder and the dynamic friction coefficient between the seedling bed and the rail, respectively. The examined transfer force curves and the theoretical ones were represented similar wave forms as to use the theoretical formular to design the device for the seedling bed transfer. The condition of no vibration of the transfer force curve was kB2 > 4M.The condition of transferring the bed by the repeatable impact and vibration force according to difference of transfer distance of the pneumatic cylinder head from that of the bed was as □ -3πD/2ω < -1, where ω=-/kM-B2/4M2, C=(B/2M-kB)/ω, D=B/2M The examined mean peak transfer force represented 4 times of the stead state transfer force. Therefore it seemed that the transfer force of the pneumatic cylinder required for design of the push device was 4Bυ where υ is the pushing speed.

천매암의 시용이 토양의 이화학적 특성과 작물의 생육 및 무기성분 흡수에 미치는 영향

김현태 ( Hyun Tae Kim ),강세원 ( Se Won Kang ),서동철 ( Dong Cheol Seo ),문성동 ( Sung Dong Moon ),조주식 ( Ju Sik Cho ) 한국환경농학회 2016 한국환경농학회지 Vol.35 No.2

BACKGROUND: Clay mineral is well known to improve physico-chemical of soil. The objective of this study was to investigate the growth characteristics and inorganic nutrient contents of crops with application levels of phyllite. METHODS AND RESULTS: Both young radish and lettuce were selected as target crops for this study. The experiment was conducted in a wagner pot(1/5000a) in glass house at Sunchon National University. Treatment conditions were divided P0NPK(No phyllite + NPK), P5NPK(phyllite 5 Mg/ha + NPK), P10NPK(phyllite 10 Mg/ha + NPK) and P15NPK(phyllite 15 Mg/ha + NPK) by crops, respectively. Bulk density and porosity of soil in control without treatment conditions were ranged from 1.02 ∼1.04 g/cm3 and 56.5∼57.0%, respectively, and those for treatments with phyllite were in the ranged from 0.94∼ 1.00 g/cm3 and 58.4∼63.5%, respectively. Dry weights of young radish and lettuce were higher in P15NPK treatment than those in other treatments. The amounts of T-N, T-P and K uptake in young radish with phyllite application treatments were increased 36∼115, 18∼67 and 20∼76% than without phyllite application treatment, respectively. In lettuce treatments, amounts of T-N, T-P and K uptake were intended to all tested treatments similar with result of young radish treatment. CONCLUSION: Therefore, these results confirm that phyllite application to the soil improves physico-chemical of soil in addition to improving growth of young radish and lettuce.

공정묘 이식기의 식부기구 운동 궤적 해석

문성동 三陟大學校 2000 論文集 Vol.33 No.2

The design of transplanting mechanism is of great importance, because the precision of crop transplantation after transplanting is dependent on transplanting point kinetic loci of transplanting mechanism for transplanter. The study introduced a working model basic interpretation technique which used with computer four bar linkage move mode mostly available to transplanting mechanism reducing the efforts and inaccuracy when using the conventional diagram solution. For the transplant spacing of 20∼40cm, the value of traveling speed/crank revolution speed be between 20 and 40cm. With the transplanting mechanism analysed in this study, for 1 to 5cm of the traveling distance on the ground the vertical angle of transplanting stand was estimated to be 0.5∼2.5。, which seemed to cause no problem to the growth of vegetables at the of transplanting.

디지털 제어 방식에 의한 온실의 환기제어 시뮬레이션

문성동,이상옥 三陟大學校 産業科學技術硏究所 2003 産業科學技術硏究論文集 Vol.8 No.2

Heating control system of the greenhouse has been achieved by a simple ON-OFF control method conventionally. It has such disadvantages as decreasing of control accuracy and cycling of control response induced by- wide dead band. To solve these problems of OK-OFF control. serial evaluations for establishment of mathematical model of the heating control system of greenhouse, identification of the recursive model, analysis of characteristics of Proportional(P) control, Proportional Integrated Derivative(PID) control and Model Reference Adaptive Control(MRAC) based on digital control methods. respectively. and simulation and evaluation of the investigated control system were carried out. A computer system was used for measuring the weather condition and controlling the power devices. The experimental greenhouse consisted of three gutter-connected round roof. covered with two layer polyethylene film, and equipped an air-heater with an oil burner.

LQ 制御技法에 의한 엔진 回轉數制御 시뮬레이션

문성동 三陟大學校 2000 論文集 Vol.33 No.2

Speed control of the engine by the centrifugal weight type grvernor(CWG) is not adequated for maintaining the constant speed under the condition of load variation. To solve this problem, it is necessary to make I type control system as we call LQ or digital control methods. This paper was performed to develop a digital LQ control system for controlling the engine speed. To find out revolution equation using regression, the dynamic characteristics of engine revolution part was measured by open loop test. Thus, a transfer function and a discrete-time equation relating the engine speed as control system output to the torque equivalant to throttle opening angle as control system input were derived from the results of the open loop test. One computer simulation using digital LQ algorithm and discrete-time equation of the control system was performed to find out LQ gains depending upon optimum engine speed responses. The other computer simulation using digital LQ algorithm with optimum gains was performed to estimate the engine speed control performances. An object of the engine was of 5.5ps gasoline, air cooled. Throttle opening and closing control was operated by step motor with 0.72 degree per one step. To computer with PID control system in performances, PID control data were cited from before study by Y.B.Minl) The test results were summarized as follows: 1. Estimated engine speeds calculated from the discrete-time equation obtained by the open loop test were fitted well to the actual engine speeds. 2. Under the step input of the reference speed, the controlled responses by LQ at transient and steady state were better than those at PID 3. Under the step input of brake torque, the engine speeds by LQ were maintained at the reference speed constantly same as by PID 4. In the frequency response test the speed fluctuations by LQ were same as by PID only within the frequency range of 0.05-2 Hz of the brake torque.

양파 自動移植機 開發에 관한 硏究

문성동 三陟大學校 産業科學技術硏究所 2002 産業科學技術硏究論文集 Vol.7 No.1

The results obtained are summarized of suitable onion plant machine to onion plant types in Korea. As follows; The invest of conventional vegetable transplanter related to data. Designed manufacture of sowing and transplanting equipment to be possible introduction of new transplanting equipment. To decide basic structure of onion transplanter, studied most suitable of main equipment part and using of result, designed manufacture of tractor sticking 6 type's onion transplanter trial machine. Improvement of point at issue through driving examination of trial machine and parking examination so development of possible merchandise onion transplanter. Developed trial machine's working efficiency appear 2.5 hour/10a effect 20 double of puller and appear exactly transplant efficiency 99% of transplanter success rate.