• Research Article

    Feasibility Study of a Virtual Environment using Building Information Modeling to Review Agricultural Infrastructure Design
    Chaehyeon Kim, Yegeun Jang, Jinhyo Kim, Yooseob Song, Bongjun Ji, Jaeheum Yeon
    An agricultural infrastructure is a representative social overhead capital to promote sustainable economic growth. To maximize economic improvement through infrastructure, agricultural infrastructure … + READ MORE
    An agricultural infrastructure is a representative social overhead capital to promote sustainable economic growth. To maximize economic improvement through infrastructure, agricultural infrastructure should be designed effectively because its shape or form can directly influence crop productivity. However, in the agricultural field, 2D drawings and specifications, which require training to interpret, are still widely employed to build agricultural infrastructure. Hence, building information modeling (BIM), which requires that 3D models of all infrastructure types or buildings be created, has been introduced. However, this 3D model is not sufficient to create the sense of presence when the agricultural infrastructure design reviewer walks through the 3D model presented on a monitor. The building information model computer-aided virtual environment (BIM CAVE) application, originally developed by Dr. Julian Kang, Texas A&M University, is employed in this study to increase a sense of presence. The existing application was updated in 2015 by an author after the existing source code associated with the vector product was revised to synchronize nine computers which surround the user in 2015. In addition, the application was updated again to be compatible with Autodesk Navisworks 2022 or later versions instead of Autodesk Navisworks 2012. Lastly, through interviews, the feasibility of the multi- monitor system based on the updated application is investigated to determine its appropriateness as an agricultural infrastructure review system. - COLLAPSE
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    31 December 2022

  • Research Article

    Soil Parameter Estimation Technology based on Hydrological Connectivity to Predict Spatially Distributed Soil Moisture

    토양수분 공간분포 예측을 위한 수문연결성 기반 토양 매개변수 추정 기술

    Seunghun Shin, Geunhyung Park, Seoro Lee, Yongchul Shin, Keunchang Jang, Jung-Hwa Chun, Jonggun Kim

    신승훈, 박근형, 이서로, 신용철, 장근창, 천정화, 김종건

    Hydrological connectivity has been proposed and utilized as an important concept to understand surface and subsurface flow processes in watershed hydrology. This … + READ MORE
    Hydrological connectivity has been proposed and utilized as an important concept to understand surface and subsurface flow processes in watershed hydrology. This can be beneficial for characterizing soil moisture variability in complex and spatially heterogeneous landscapes. Existing hydrological models have limitations in adequately explaining subsurface characteristic patterns connected with flow path continuity in unsaturated regions. Therefore, to better understand the subsurface flow spatial distribution and to improve the soil hydraulic parameter properties in hydrological modeling (Soil and Water Assessment Tool, SWAT), the parameters were revised by applying the hydrological connection algorithm based on the physical soil and land surface properties, and the model performance was evaluated. Firstly, the correlations between the soil moisture data and weightings were calculated using soil properties (sand% and clay%), normalized difference vegetation index (NDVI), and the topographic index which are related to the soil moisture spatial distribution characteristics. The hydrological connectivity analysis was performed according to various thresholds based on these weightings and using new spatial distribution data which combines physical properties. Subsequently, the available water content (Sol_AWC) and saturated hydraulic conductivity (Sol_K) variables, which are closely related to soil moisture estimates in the SWAT model, were revised according to the connectivity index. The results of this study showed that the spatial variation of soil moisture can be explained well using the hydrological connectivity index based on the physical properties, and that the existing model performance can be improved using the corrected (spatially distributed) soil hydraulic parameters. - COLLAPSE
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    31 December 2022

  • Research Article

    Biomass Increment of Miscanthus × giganteus by Weed Control: The Importance of Reducing Early Resource Competition

    잡초 제거에 의한 Miscanthus × giganteus의 바이오매스 증가: 잡초와의 조기 자원 경쟁 우위의 중요성

    Gyung Deok Han, Yoonha Kim, Haisu Lee, Sanghyeob Lee

    한경덕, 김윤하, 이해속, 이상협

    Silver grass (Miscanthus × giganteus) has traditionally been used as a feedstock and for ornamental and medicinal purposes. Recently, however, … + READ MORE
    Silver grass (Miscanthus × giganteus) has traditionally been used as a feedstock and for ornamental and medicinal purposes. Recently, however, the biomass uses of silver grass have also been highlighted. This grass comprises 40% cellulose, 25% hemicellulose, and 21% lignin, the cellulose component of which can be converted into glucose, as a source of biofuel, whereas the lignin can be used as a resource for UV protectant film development. Given these utilities, silver grass is considered to have high value as a biomass plant. Consequently, it is desirable to develop efficient methods for the cultivation of this grass. Some studies have reported that weed control is necessary during the initial 2 years of silver grass cultivation; however, none of these studies have been conducted in a Korean cultivation environment. In this study, we accordingly evaluated the efficacy of four herbicides commonly used in Korea for weed control during silver grass cultivation. We found that herbicide treatments have beneficial effects on the growth of silver grass, notably with respect to branching. On the basis of our findings, we conclude that to maximize the final biomass yield, a high level of weed control is essential during the initial 2 years of silver grass cultivation. - COLLAPSE
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    31 December 2022

  • Research Article

    Production and Fuel Properties of Wood Chips from Short-rotation Coppice based on Harvesting Methods

    수확방법에 따른 단벌기 목재에너지림 목재칩의 생산 및 연료 특성

    Yun-Sung Choi, Min-Jae Cho, Ho-Seong Mun, Jae-Heun Oh

    최윤성, 조민재, 문호성, 오재헌

    This study was conducted to compare the productivity and cost of harvesting and processing system between manual and mechanized methods in short-rotation … + READ MORE
    This study was conducted to compare the productivity and cost of harvesting and processing system between manual and mechanized methods in short-rotation coppice (SRC). The wood chips were divided into class based on their characteristics. There was also a consideration whether the fuel conditions of the energy facilities were suitable. The cost of mechanized harvesting system (48,525 won/Gwt) was lower than that of manual harvesting system (107,350 won/Gwt) by approximately 54.8%. The results of the fuel properties analysis for wood chips A (chipping immediately after harvesting) and wood chips B (chipping after drying) showed that wood chips A was not suitable because of the bulk density, and wood chips B was evaluated to be a second class based on the quality standards of wood chips in all conditions. The wood chips B was available at all energy facilities except gasification combined heat and power system (CHP), which required low moisture content (less than 13%). In addition, if the quality of wood chips was improved, (increased storability, uniformity of wood chips size, and reduced fines) by performing drying and screening operation after chipping, it can be used for all energy facilities. - COLLAPSE
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    31 December 2022

  • Research Article

    Evaluation of Productivity and Cost of Regeneration Practices of a Natural Pinus densiflora S. et Z. Stand

    천연하종갱신 소나무 임분의 밀도조절 작업 생산성 및 비용 분석

    Kigwang Baek, Eunjai Lee, Sanghoon Chung

    백기광, 이은재, 정상훈

    Natural forest regeneration effectively protects forest ecosystems and is a low-cost option compared to artificial regeneration. However, this technology requires increased financial … + READ MORE
    Natural forest regeneration effectively protects forest ecosystems and is a low-cost option compared to artificial regeneration. However, this technology requires increased financial resources for tree tending and blank-filling. A better understanding of the productivity and costs for the tending of young trees in a natural regeneration stand is therefore required, particularly in South Korea. This study aims to evaluate the productivity and cost of young tree tending in the naturally regenerated young Pinus densiflora forests. The tending used to control the density level of pine forests (2,000 trees/ha and 3,000 trees/ha) in the young forest stage was divided into three treatments－row operation, regular pattern operation, and irregular pattern operation. The results demonstrated that the productivity in the operational density level of 3,000 trees/ha was statistically higher than the density level operation of 2,000 trees/ha, barring the irregular pattern operation. The amount of work required for each treatment type was also determined to be significantly different (p < 0.01). In addition, the unit operating cost of the density level of 2,000 trees/ha was considerably higher. The results of this study are expected to be used as basic data required to improve the productivity of the tending of young trees in naturally regenerated young pine tree forests. - COLLAPSE
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    31 December 2022

  • Research Article

    Synthesis of a Sex Pheromone for Eco-friendly Control of Spodoptera frugiperda

    열대거세미나방의 환경친화적 방제를 위한 성페로몬의 합성

    Seon-hee Choi, Hye Ran Son, Jae-geun Kim

    최선희, 손혜란, 김재근

    In this study, using an economical method, we synthesized the (Z)-9-tetradecenyl acetate and (Z)-7-dodecenyl acetate components of the sex pheromone of Spodoptera … + READ MORE
    In this study, using an economical method, we synthesized the (Z)-9-tetradecenyl acetate and (Z)-7-dodecenyl acetate components of the sex pheromone of Spodoptera frugiperda, a major pest of corn and rice crops. Given the expensive starting materials, the method previously developed for the synthesis of these chemicals is unsuitable for bulk production at industrial scales. Moreover, this method necessitates the use of the highly explosive reducing agent lithium aluminum hydride. To reduce production costs, as starting materials, we used the comparatively inexpensive chemicals 1,8-octanediol and 1,6-hexanediol. In addition, for conversion of triple bonds to Z-double bonds, we used Ni(OAc)2 instead of the more expensive Pt or Pd. The production cost of mass-synthesized products was approximately 50,000 won/g, which represents a considerable saving on the existing method, and can be distributed at a low price. As these products will be available to consumers at economical prices, this method will contribute to the environmentally friendly control of S. frugiperda. - COLLAPSE
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    31 December 2022

  • Research Article

    Slope Failure Prediction Study based on LSTM Autoencoder

    LSTM Autoencoder 기반의 사면 붕괴 예측 연구

    Jun-Hwi Cho, Jun-Hyuk Choi, Yong-Seong Kim, Jae-Heum Yeon, Seung-Joo Lee, Bong-Jun Ji

    조준휘, 최준혁, 김용성, 연재흠, 이승주, 지봉준

    Numerous researchers have evaluated the stability of the slope, as its failure can cause severe damage to life and property. To this … + READ MORE
    Numerous researchers have evaluated the stability of the slope, as its failure can cause severe damage to life and property. To this end, real-time data were collected and analyzed to evaluate the real-time risk in various slopes. However, most of the previous studies have either derived an empirical regression equation or relied on statistical methodologies, including statistical process control (SPC). In this study, a machine learning model, long short-term memory network (LSTM) Autoencoder, based on slope failure prediction was developed and validated by applying it to data on actual slope failure. As a result, it was possible to detect signs of collapse earlier than the SPC method used in previous studies and is expected to ensure lead time to cope with such collapse. - COLLAPSE
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    31 December 2022

  • Research Article

    A Study on Indoor Cultivation of Petrosedum rupestre and P. rupestre cv. Angelina Using Commercial White T5 LEDs

    상용 백색 T5 LED를 활용한 페트로세덤 루페스트레와 ‘안젤리나’의 실내재배에 관한 연구

    Hyeon-Jin Kim, Jae-Hwan Lee, Jae-Hong Lee, Min-Seong Ko, Sang-Yong Nam

    김현진, 이재환, 이재홍, 고민성, 남상용

    Petrosedum rupestre is a succulent plant growing throughout Europe, except for Western Europe, and is one of the most preferred plants for … + READ MORE
    Petrosedum rupestre is a succulent plant growing throughout Europe, except for Western Europe, and is one of the most preferred plants for rock gardens and green roof systems. P. rupestre has a beautiful blue appearance and may be used for medicinal purposes. This study was conducted to determine the optimal light conditions using white LEDs (light-emitting diodes) for indoor cultivation of P. rupestre and P. rupestre cv. Angelina (hereinafter referred to as ‘Angelina’) using three commercial white T5 LEDs with color temperatures of 3000, 4100, and 6500 K, respectively. Shoot length, fresh weight, moisture content, and CIELAB b* values increased under 3000 K white LED due to the relatively large ratio of red to blue wavelengths (approximately 3.3:1), whereas the CIELAB a* value decreased. The 4100 K white LED, in which the ratio of red to blue wavelength was lower by approximately 1.8:1, produced increased shoot width, plant ground cover, and number of branches. The RHS values of P. rupestre were N137D and 147A in the 3000 K white LED treatment, and ‘Angelina’ was evaluated as 146A and 148A in the same treatment, indicating that the leaf color was relatively yellow compared to other treatments. In the Pearson correlation coefficient, P. rupestre showed a positive correlation with fresh weight, and L* value was r = 0.510, and it was found that the more vigorous the plant growth, the higher the leaf lightness. Previous studies have shown that an increase in epicuticular waxes positively affects plant growth and development. Accordingly, epicuticular waxes on the surface of P. rupestre also seem to occur during vigorous plant growth. Taken together, the results suggest that 3000 K white LED is optimal for growing P. rupestre and ‘Angelina’ indoors, whereas 4100 K white LED is preferable for low growth with a creeping type. - COLLAPSE
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    31 December 2022

  • Research Article

    Effect of CO2 Fertilization using Catalytic CO2 Generator on Alstroemeria Cut Flower Yield and Growth

    촉매형 CO2 발생기를 이용한 CO2 시비가 알스트로메리아 절화 수확량과 생육에 미치는 영향

    JiMin Lim, SeongHwa Bak, PilSoo Jeong, Tae-Ho Han

    임지민, 박성화, 정필수, 한태호

    This study was conducted to evaluate the effect of CO2 fertilization in winter plastic houses on cut flower yield and growth … + READ MORE
    This study was conducted to evaluate the effect of CO2 fertilization in winter plastic houses on cut flower yield and growth characteristics of Alstroemeria. The cultivars used in the experiment were Alstroemeria ‘Hanhera’ and ‘HappyAls’, and they were planted in the ground on August 25, 2021. The untreated greenhouse was maintained at a CO2 atmospheric concentration of 400 ppm, and the CO2-fertilized greenhouse was fertilized at an average concentration of 800 ppm. The concentration of CO2 reached the 800 ppm at 8 am and decreased to approximately 300 ppm by 11 am, before the side windows were opened in the CO2-treated greenhouse on January 26, 2022. This indicated that photosynthesis in Alstroemeria was most active from 8 am to 11 am. The cut flower yield of Alstroemeria ‘Hanhera’ increased by approximately 62% in the CO2-fertilized greenhouse compared to that in the untreated greenhouse. The flowering shoot height of Alstroemeria ‘Hanhera’ was 93.5 cm in the treated greenhouse, which was approximately 43% higher than that in the untreated greenhouse. These results demonstrate that CO2 fertilization during the Alstroemeria cultivation in winter plastic houses effectively increases flowering shoot height and yield. - COLLAPSE
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    31 December 2022

  • Research Article

    Analysis of the Impact of Official Development Assistance on Economic Growth in Zambia
    Moonga Mundia Andrew, Dae Seob Lee
    Official development assistance (ODA) is of particular importance in the development process of many developing countries that lack sufficient domestic finances to … + READ MORE
    Official development assistance (ODA) is of particular importance in the development process of many developing countries that lack sufficient domestic finances to pursue their economic growth. One such country is Zambia, which although resource rich, is an aid-dependent country with a poor economic performance. It is assumed that ODA will promote the economic growth of recipient countries, thereby alleviating poverty and raising living standards. Despite the fact that on a worldwide scale, there has been extensive research on the effects of aid on economic growth, very few studies of this type have been conducted in Zambia. In this study, we performed vector error correction modeling, an estimation technique based on an improved version of the neoclassic theoretical growth model, to quantify the short- and long-term associations between ODA and economic growth in Zambia from 1988 to 2019. Our findings reveal that whereas there is no long-term causality between ODA and economic growth, there is a short-term association, thereby indicating that ODA can make a significant positive short-term contribution to the national gross domestic product. The results also provide evidence to indicate that private external resource flows have contributed positively to economic growth during the period under review. On the basis of these findings, it can be concluded that Zambia should continue to accept ODA, as this is a vital source of external finance that is necessary to boost its economy. However, the country should also develop a realistic “exit” strategy by focusing attention on how to raise revenue in the future, as domestically generated revenue will contribute to expanding the policy space and national ownership of the development agenda. - COLLAPSE
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    31 December 2022

  • Research Article

    Habitat Suitability Index Calculation According to Changes in the Fisheries of the Seom River After Hoengseong Dam Construction

    횡성댐 건설 후 섬강 어류상 변화에 따른 서식지적합도지수 산정

    Sang-Hui Hwang, Ui-Seok Kim, Sang-Don Byeon, Jae-Seok Choi, Jin-Hyuk An, Eun-Mi Hong

    황상희, 김의석, 변상돈, 최재석, 안진혁, 홍은미

    In this study, the habitat suitability index (HSI) was calculated through on-site monitoring twice on July 9－10, 2021 and November 6, 2021. … + READ MORE
    In this study, the habitat suitability index (HSI) was calculated through on-site monitoring twice on July 9－10, 2021 and November 6, 2021. During the site monitoring 1,625 objects comprising 35 species belonging to nine families were collected from six survey stations. In addition, physical data, such as depth and velocity, and biological data, such as fish species and populations, were collected. The dominant and subdominant species were Pungtungia herzi (28.00%) and Zacco koreanus (19.26%), respectively, followed by Zacco platypus (13.72%), Rhodeus pseudosericeus (7.63%), Pseudogobio esocinus (3.75%), Coreoleuciscus splendidus (2.52%), Acheilognathus rhombeus (2.03%), and Acheilognathus lanceolatus (2.03%). To calculate the HSI using the Instream Flow and Aquatic Systems Group method, physical information, such as depth and velocity, were used from three selected fish species. P. herzi was selected as the dominant species, and Z. platypus and Z. koreanus as the subdominant species. For P. herzi, the water depth was 0.5－0.6 m and the velocity was 0.0–0.1 m/s. For Z. platypus and Z. koreanus, the water depths were 0.3－0.5 m and 0.4–0.5 m, respectively, while the velocity was 0.0–0.1 m/s for both species. These species have an HSI value of 1.0 in this range. The HSI developed in this study may be utilized to calculate environmental ecological flow and improve river health. Additionally, it is judged to be highly useful as basic data for river restoration plans. - COLLAPSE
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    31 December 2022

  • Research Article

    Comparison of Internal Environmental Factors and Growth According to Greenhouse Type in Hydroponic Cultivation of Seedless Watermelon ‘Black Boy’ Using Hanger-type Pillar

    행거형 지주을 이용한 씨없는 수박 ‘블랙보이’의 수경재배 시 온실유형에 따른 내부환경 및 생육 비교

    Seung Mi Woo, Sang Woon Son, Hyeon Seung Do, So Yeon Lee, Ho Cheol Kim

    우승미, 손상운, 도현승, 이소연, 김호철

    This study examined the differences in the internal environment and growth of seedless watermelon (Citrullus lanatus) ‘Black Boy’ across two … + READ MORE
    This study examined the differences in the internal environment and growth of seedless watermelon (Citrullus lanatus) ‘Black Boy’ across two types of greenhouse (single span, SS and multi-span, MS), grown under hydroponics using hanger-type pillar. Neither types of greenhouse had an environmental control system. From fertilization to harvest, air temperature was significantly higher in MS than in SS, but the daily mean solar radiation intensity did not differ between SS and MS. Accumulated temperature increased faster in SS greenhouses than in MS greenhouses as a function of time, but the cumulative total of internal radiation did not differ. Photosynthetically active radiation intensity around the plants was lower in MS greenhouses than in SS greenhouses; consequently, the change in plant temperature in MS greenhouses was lower than that in SS greenhouses. In SS greenhouses, the fruit volume increased by 3.55 cm3 fruit-1 as the cumulative light intensity increased by 1 mol m-2. The influence of environmental factors on growth and fruit characteristics of watermelon could not be clearly compared across the two types of greenhouses due to mite damage in MS greenhouses. - COLLAPSE
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    31 December 2022

  • Research Article

    Effects of Shading Treatment on the Growth and Leaf Color Quality of Potted Phedimus takesimensis cv. Atlantis

    차광처리가 분화재배 섬기린초 ‘아틀란티스’의 생장과 엽색 품질에 미치는 영향

    Jae-Hwan Lee, Sang-Yong Nam

    이재환, 남상용

    Phedimus takesimensis is a succulent species indigenous to the Korean Peninsula and is found in Ulleungdo and Dokdo islands. It has potential … + READ MORE
    Phedimus takesimensis is a succulent species indigenous to the Korean Peninsula and is found in Ulleungdo and Dokdo islands. It has potential medicinal properties; thus, it should be protected in South Korea. However, the optimal shading level for mass cultivation of P. takesimensis is unknown. In this study, we subjected P. takesimensis cv. Atlantis, a variegated leaf cultivar, to different shading levels (0, 35, 45, 60, 75, and 99%) and investigated its effect on the growth and leaf color of the plants. The results revealed that the potted plants grown under 45% shading exhibited the highest shoot length, width, and shoot fresh and dry weights. Moreover, the plants grown under 0－45% shading exhibited the highest root length and root fresh and dry weights. However, leaf length and width were higher in the plants grown under 35－60% shading, and the moisture content of the shoot and root was the highest in the plants grown under 60% and 75% shading, respectively. Chlorophyll content analysis revealed a subsequent increase as the shading level decreased; the L* and b* CIELAB values were higher as the shading levels increased. The CIE76 color difference (ΔE*ab) was the highest at 75% shading (ΔE*ab = 7.08) compared to that at 0% shading level. The plants that were grown under 0－45%, 60%, and 75% shading had the following RHS values: 147B and 148A; 147B and 148B; and 147C and 148B, respectively. This suggests that the leaves of the plants were relatively yellow at 60－75% shading. Thus, potted plants of P. takesimensis cv. Atlantis should be grown under 45% shading to attain a significant increase in plant size and improve leaf color. - COLLAPSE
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    31 December 2022

  • Research Article

    Effects of Nutrient Solution Treated with Electrostatic Water Treatment Equipment on the Growth and Fruit Characteristics of Tomatoes

    정전계 수처리기기를 이용하여 처리된 양액이 토마토의 생육과 과실에 미치는 영향 및 성분의 변화

    Kyeong-yeon Kim, Sung-min Park

    김경연, 박성민

    This study was conducted to investigate how electrostatic field water treatment influences the growth and yield of tomatoes during hydroponic cultivation using … + READ MORE
    This study was conducted to investigate how electrostatic field water treatment influences the growth and yield of tomatoes during hydroponic cultivation using a coir substrate. Electrostatic field water treatment is a method that achieves sterilizing and disinfecting effects by weakening the hydrogen bonding force through high voltage. The focus was laid on the tomato variety ‘Dandani’, which was cultivated for about 10 weeks. Arrangements of the test plots were divided into various treatments such as electrostatic field water treatment and general hydroponic cultivation. Inorganic ion content during growth, fruit supply, and drainage and the ion content of each plant organ were analyzed. The results show an increase in the leaf length of treated plants by 9.54% and the leaf area by about 24.3% compared to the control group. No difference was observed in the fruit set rate nor in the fruit characteristics, but the navel rot was reduced by 1/3 (11.56% in the control group and 3.52% in the treatment group). This was confirmed by the difference between drainage content and liquid supply. This study suggests, that using electrostatic field water treatment in tomato circulation type hydroponic cultivation potentially reduces calcium deficiency during the rainy season. - COLLAPSE
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    31 December 2022

  • Research Article

    Efficacy of Antagonistic Bacterial Isolates in Suppressing Sclerotinia rot and Promoting Growth in Lettuce

    상추 균핵병 억제 및 생장촉진을 위한 길항 세균의 효능

    Hyun Seung Kim, Adhikari Mahesh, Hyo Bin Park, Gi Young Kim, In Gyu Lee, Eun Jeong Byeon, Ji Min Woo, Youn Su Lee

    김현승, 마헤시 아드히카리, 박효빈, 김기영, 이인규, 변은정, 우지민, 이윤수

    This study was conducted to biochemically characterize and screen the efficacy of antagonistic bacterial isolates in suppressing sclerotinia rot in lettuce crops. … + READ MORE
    This study was conducted to biochemically characterize and screen the efficacy of antagonistic bacterial isolates in suppressing sclerotinia rot in lettuce crops. A total of 123 bacterial isolates were isolated from soil. In vitro antagonistic screening showed that 13 bacterial isolates were effective against Sclerotinia sclerotiorum and S. minor. In particular, two strains of Bacillus megaterium (HCS-1B and WJR-6B) showed the highest effectiveness against the tested pathogens, with a 75–80% inhibition rate. Additionally, the 13 bacterial isolates were biochemically characterized. Ammonia production, phosphate solubilization, protease production, starch hydrolysis and siderophore production, and HCN production were observed in 13, 3, 11, 9, and 2 bacterial isolates, respectively. Based on the results of the in vitro antagonistic test and biochemical characterization, the two best bacterial isolates (HCS-1B and WJR-6B) were selected for sclerotinia rot suppression and lettuce growth promotion under greenhouse conditions. The lowest incidence rate (0%) of sclerotinia rot was recorded in WJR-6B-treated lettuce pre-inoculated with S. sclerotiorum and in S. sclerotiorum-inoculated lettuce pretreated with HCS-1B. Combination treatment of HCS-1B and WJR-6B increased the leaf area of lettuce by approximately 3-fold (218.4 cm2) compared to the control (75 cm2). In this study, HCS-1B and WJR-6B were identified as potential antagonistic bacterial isolates that inhibit sclerotinia rot. Field testing of these potential bacterial isolates would be a good direction for future studies. - COLLAPSE
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    31 December 2022

  • Research Article

    Drive System analysis of the Switched Reluctance Motor for Lawn Mowers

    예초기용 스위치드 릴럭턴스 전동기의 구동 드라이버 시스템 해석

    Han-wook Cho, Jooseon Oh, Young-joo Kim, Sung-bo Shim

    조한욱, 오주선, 김영주, 심성보

    A switched reluctance motor is commonly used as the electric power source for electric-drive lawn mowers. An appropriate model was identified by … + READ MORE
    A switched reluctance motor is commonly used as the electric power source for electric-drive lawn mowers. An appropriate model was identified by analyzing the SRM model that satisfied the specifications of the selected lawn mower and analyzing its characteristics. The models consisted of two parallel circuits or four parallel circuits. In this study, static characteristic analysis, output characteristic analysis, and steady state analysis were performed. The target specification of the SRM was 300 W and 15,000 rpm. The results of the analysis confirmed that the characteristics of the four parallel circuit model satisfied the speed and output power, with a relatively high efficiency. - COLLAPSE
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    31 December 2022

  • Research Article

    Reinforcement Design to Improve the Quality of Urea Storage Tanks

    요소수 저장 탱크의 감성 품질 향상을 위한 보강 설계

    Jooseon Oh, Minju Shin, Jung-ho Park, Woo-jin Chung, Sung-bo Shim

    오주선, 신민주, 박정호, 정우진, 심성보

    In this study, an analysis of a urea storage tank was performed using a simulation program, and a reinforcement method was proposed … + READ MORE
    In this study, an analysis of a urea storage tank was performed using a simulation program, and a reinforcement method was proposed to limit the amount of deformation of the tank wall to a level that does not cause psychological anxiety. The sensory threshold for recognizing a straight line as a curve was calculated using experimental data from the literature to calculate the maximum amount of straight-line deformation. The calculated result was set as the design goal and was compared with the analysis results of the amount of deformation of the urea storage tank. It was confirmed that the design goal was satisfied when six stiffeners were applied. - COLLAPSE
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    31 December 2022

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    Erratum to: Antioxidant and Cytotoxic Activities of Extracts from Aerial Parts and Roots of Ophiopogon planiscapus ‘Nigrescens’

    흑맥문동 지상부와 뿌리 추출물의 산화방지 효과 및 세포독성 평가

    Yeo Wan Son, Smee Kang, Ji Sun Lee, Ju An Youn, Mae Hee Chiang

    손여완, 강스미, 이지선, 윤주안, 장매희

    This erratum is being published to correct the printing error on pages 24 of the article [Vol.34, No.1, pp.17-25, 2022] entitled “Antioxidant … + READ MORE
    This erratum is being published to correct the printing error on pages 24 of the article [Vol.34, No.1, pp.17-25, 2022] entitled “Antioxidant and Cytotoxic Activities of Extracts from Aerial Parts and Roots of Ophiopogon planiscapus ‘Nigrescens’ ”. There was an error in the acknowledgements, and it was changed from “본 연구는 2018학년도 서울여자대학교 학술연구비의 지원을 받았음. ” to “이 논문은 2018학년도 서울여자대학교 연구년 연구비의 지원을 받았음.” “This study was supported by the academic research grant of Seoul Women’s University in 2018.” to “This study was supported by the academic research grant of sabbatical year of Seoul Women’s University in 2018.” - COLLAPSE
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    31 December 2022
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