• Title/Summary/Keyword: Che-Yong

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Kinematic Analysis of Horse-Riding Posture According to Skill Levels during Rising Trot with JeJu-horse (제주마를 이용한 승마 경속보시 숙련도에 따른 기승자세의 운동학적 비교분석)

  • Oh, Woon-Yong;Ryew, Che-Cheong;Kim, Jin-Hyun;Hyun, Sung-Hyun
    • Korean Journal of Applied Biomechanics
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    • v.19 no.3
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    • pp.467-479
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    • 2009
  • The purpose of this study was to present the quantitative data which riders can utilize teaching field by comparison analysis of kinematics according to skill level of rider during 2 strides rising trot with the JeJu's-Horse. Participated subjects was consisted of total 10 riders(unskilled: n=5, skilled: n=5). The method of experiment & analysis was based on 3D cinematography. Variables were consisted of temporal, linear & angular kinematics by each event & phase. The skilled assigned more ratio of elapsed time in air than support phase, had the less range of motion in up-down direction and more consistent velocity in lateral & forward direction and performed periodic up-down movement with alignment in vertical direction according to elapsing of phases. The skilled more flexed at elbow and extended backwardly according to elapsing of phases, while more flexed forwardly at hip & knee and plantarflexion at ankle. The skilled postured backward extension but the unskilled do forward flexion. That is, It was considered that the unskilled continued more unstable posture than the skilled during 2 strides in rising trot.

Extraction Yields of Hizikia fusiforme and Aloe vera Linne by Supercritical Carbon Dioxide and Antimicrobial Activity of their Extracts (초임계이산화탄소에 의한 톳과 알로에 추출물의 수율 및 항균활성)

  • Lim, Sang-Bin;Kim, Soo-Hyun;Ko, Young-Hwan;Oh, Chang-Kyung;Oh, Myeong-Cheol;Ko, Yong-Gu;Park, Che-Seok
    • Korean Journal of Food Science and Technology
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    • v.27 no.1
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    • pp.68-73
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    • 1995
  • Extraction yields of Hizikia fusiforme and Aloe vera Linne by supercritical carbon dioxide($SC-CO_{2}$) with and without ethanol as a cosolvent, and antimicrobial activities of the extracts against Escherichia coli, Bacillus subtilis, Saccharomyces cerevisiae and Alternaria sp. were determined. Both yield and solubility of the extracts from Hizikia fusiforme and Aloe vera Linne by $SC-CO_{2}$ with ethanol were two times greater than those by only $SC-CO_{2}$. All of the extracts demonstrated antimicrobial activities in the decreasing order of bacteria, yeast and fungus. The extracts by $SC-CO_{2}$ with ethanol showed almost the same degree of microbial growth inhibition as those by only $SC-CO_{2}$. Based upon these data, it was speculated that the components soluble in nonpolar solvent might be more responsible for the antimicrobial activity.

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Effects of Red Ginseng Component Administration on Glutathione and Lipid Peroxidation Levels in Mice Liver (홍삼 활성 성분이 생쥐 간 조직에서 Glutathione 및 지질과산화에 미치는 항산화 효과)

  • Sung, Kum-Soo;Chun, Chul;Kwon, Yong-Hun;Chang, Che-Chul
    • Journal of Ginseng Research
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    • v.24 no.4
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    • pp.176-182
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    • 2000
  • The effects of red ginseng component (water extracts, alcohol extracts, lipophilic extracts, total saponins, panaxadiol and panaxatriol) administration on glutathione (GSH) and lipid peroxidation levels in mice were investigated. 20~25 g ICR mice which were pretreated with water extracts (50 mg/kg), alcohol extracts (50 mg/kg), lipophilic extracts (50 mg/kg), total saponins (50 mg/kg), panaxadiol (50 mg/kg) and panaxatriol (50 mg/kg) for 15 days. The ability of red ginseng component to protect against oxidative damage to the mouse liver was examined by determining the level of lipid peroxidation (MDA), glutathione, and the activities of glutathione peroxidase (GPX). The GSH level was raised by all the ginseng component, but the GSSG level was lowered ]argely by all the ginseng component. The ratio of GSSG/total GSH was decreased because the level of GSSG was decreased more than that of GSH. Finally, the lipid peroxidation (MDA) level was the lowest in lipophilic extracts and panaxadiol nest. In conclusion, the order of effectiveness of anti-oxidants was to be lipophilic extracts>panaxadiol>total saponins.

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A Study of Indoor Air Quality of Public Facilities in Chung-Nam Area (충남지역 미적용 다중이용시설의 실내공기질에 관한 연구)

  • Hong, Sung-Chul;Jou, Hye-Mee;Cho, Tae-Jin;Lee, Che-Won;Jung, Yong-Taek;Son, Bu-Soon
    • Journal of environmental and Sanitary engineering
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    • v.23 no.2
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    • pp.35-45
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    • 2008
  • In order to recommend criteria for the administration law on indoor air quality, this study was conducted to examine the distribution and the concentration of indoor air pollutants ($PM_{10},\;CO_2$, CO, HCHO, TBC, $NO_2$, Rn, VOCs, asbestos, $O_3$) in public facilities in the Chung-Nam area. The concentrations of indoor air pollutants were obtained from sixty seven public facilities such as a cinema, an office, a restaurant, a theater and an academy. This study was performed from August to December, 2005. The results of this study showed that the concentrations of indoor air pollutants such as $PM_{10},\;CO_2$, CO, HCHO, TBC, Rn and $O_3$ were less than the recommended limits. However, the average concentration of VOCs was $521.73{\mu}g/m^3$ (GM : $221.69{\mu}g/m^3$), which was higher than the recommended limit of $400{\mu}g/m^3$. Moreover, the average concentration of $NO_2$ was 345.66ppb (GM : 69.95ppb), which was higher than the recommended limit of 50 ppb. The correlation between the concentrations of indoor air pollutants and the type of facilities with respect to $CO_2$, TBC and Rn was statistically low (p<0.05). However, the correlation was high in terms of the CO and $O_3$ concentrations (p<0.01). No relationship between the indoor air pollutants and the type of facilities was observed for $PM_{10}$, VOCs and $NO_2$. The year of construction was compared to the concentrations of indoor air pollutants. Specifically, when the construction date was less than 3 years, the HCHO, VOCs and TBC concentrations were $44.75{\mu}g/m^3,\;555.07{\mu}g/m^3$ and $337.79CFU/m^3$, respectively. These concentrations were $120{\mu}g/m^3$ and $211.84CFU/m^3$ higher for VOCs and TBC than the concentrations obtained from the facilities more than 3 years. However, the concentration of HCHO was similar between the facilities older and younger than 3 years of age. Year, temperature, humidity and indoor air pollutant correlation analyses showed that temperature and humidity, temperature and TBC, temperature and $O_3,\;PM_{10}$ and $NO_2$, HCHO and VOCs, $CO_2$ and Rn had positive relationships. However temperature and Rn, humidity and $CO_2,\;CO_2$ and $O_3,\;O_3$ and Rn had negative relationships. Accordingly, it will be necessary to manage the factors affecting indoor air quality so that the residents can have a more comfortable and healthier living environment. Ultimately, the results of this study are expected to be utilized as baseline data.

A survey of respiratory pathogens in dogs for adoption in Gwangju metropolitan city animal shelter, South Korea (광주광역시동물보호소 입양 대상 유기견의 호흡기 질병 실태 조사)

  • Koh, Ba-Ra-Da;Kim, Han-Na;Kim, Hyo-Jung;Oh, A-Reum;Jung, Bo-Ram;Park, Jae-Sung;Lee, Jae-Gi;Na, Ho-Myoung;Kim, Yong-Hwan
    • Korean Journal of Veterinary Service
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    • v.43 no.2
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    • pp.67-77
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    • 2020
  • Canine infectious respiratory disease (CIRD), also known as infectious tracheobronchitis or kennel cough occurs in a multiple-dog environment such as a shelter. In this study, we were collected 300 of nasal swab samples from dogs and 145 of environmental samples from a shelter to investigate respiratory pathogens of dogs in the Gwangju metropolitan city animal shelter from February to October, 2019. Bacteria cultures for isolation of Bordetella (B.) bronchiseptica and polymerase chain reaction (PCR) tests were performed for detection of eleven canine respiratory pathogens, namely Mycoplasma (M.) cynos, canine distemper virus (CDV), canine influenza virus (CIV), canine parainfluenza virus (CPIV), canine respiratory coronavirus (CRCoV), alpha-coronavirus (CCoV), canine pneumovirus (CnPnV), canine hepacivirus (CHeV), canine adenovirus type 2 (CAdV-2), canine herpesvirus-1 (CHV-1) and canine bocavirus (CBoV). Among 300 nasal swab samples, 148 samples (49.3%) were positive for at least one pathogens. CHV-1 was the most common pathogen, found in 95/300 (31.7%) samples. Subsequently, M. cynos (22.0%), B. bronchiseptica (2.3%), CPIV (2.0%), CBoV (1.7%), CCoV (0.7%) were detected. The detection rates of M. cynos and CHV-1 according to the duration of stay in the shelter were statistically significant. Among environmental samples, M. cynos, CCoV, CBoV and CHV-1 were detected in 45/145 (31.0%). These results indicated the need for disease control and prevention systems in the shelter.

Growth Characteristics and Forage Productivity of New Orchardgrass (Dactylis glomerata L.) Variety, 'Lucky One' (오차드그라스 신품종 '럭키원'의 생육특성과 수량성)

  • Ji, Hee Chung;Che, Hyun Seog;Lee, Song Tea;Hwang, Tae Young;Kim, Ki Yong;Lee, Sang Hun;Lee, Ki Won
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.36 no.1
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    • pp.19-22
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    • 2016
  • 'Lucky one' is a new orchardgrass (Dactylis glomerata L.) variety developed by the National Institute of Animal Science (NIAS) in 2014. Four superior clones were selected and polycrossed for seed production to develope this new variety of orchardgrass. The agronomic growth characteristics and forage productivity of 'Lucky one' were examined at Cheonan from 2010 to 2011. Regional adaption trials were conducted in Cheonan, Hoengseong, Jinju, and Jeju from 2012 to 2014. 'Lucky one' showed growth habit of medium type in fall and spring. It has short flag leaf length with long upper internode. Plant height of 'Lucky one' was 3 cm more than that of control variety, 'Amba'. Its heading date was 2 days later than that of control variety 'Amba'. Characteristics such as waterlogging and disease resistance of 'Lucky one' were stronger or better than those of control variety, 'Amba', Especially, dry matter yield of 'Lucky one' (16,191 kg/ha) was increased 38% compared to that of control variety, 'Amba'(11,778 kg/ha). Nutritive feed values of 'Lucky one' appeared to be similar to those of control variety 'Amba' except in Vitro dry matter digestibility (IVDMD) and crude protein content.

Growth Characteristics and Forage Productivity of New Orchardgrass (Dactylis glomerata L.) Variety, 'Onnuri 2ho' (오차드그라스 신품종 '온누리 2호'의 생육특성과 수량성)

  • Ji, Hee Chung;Che, Hyun Seog;Lee, Song Tea;Hwang, Tae Young;Kim, Ki Yong;Lee, Sang Hun
    • Journal of The Korean Society of Grassland and Forage Science
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    • v.36 no.1
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    • pp.15-18
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    • 2016
  • 'Onnuri 2ho' is a new orchardgrass (Dactylis glomerata L.) variety developed by the National Institute of Animal Science (NIAS) in 2014. Four superior clones were selected and polycrossed for seed production to develop this new variety of orchardgrass. The agronomic growth characteristics and forage productivity of 'Onnuri 2ho' were examined at Cheonan from 2010 to 2011. Regional adaptation trials were conducted in Cheonan, Hoengseong, Jinju and Jeju from 2012 to 2014. 'Onnuri 2ho' showed growth habit of medium type in fall and spring. It is long in length of flag leaf with medium upper internode. Plant height of 'Onnuri 2ho' was 4 cm more than that of control variety, 'Amba'. Its heading date was 4 days later than compared to control variety, 'Amba'. Characteristics such as waterlogging and disease resistance of 'Onnuri 2ho' were stronger or better than those of control variety, 'Amba', Especially, the dry matter yield of 'Onnuri 2ho' (15,814 kg/ha) was increased 34 % compared to that of control variety, Amba (11,778 kg/ha). Nutritive feed values of 'Onnuri 2ho' appeared to be similar to that of control variety 'Amba' except in Vitro dry matter digestibility (IVDMD).

Uncertainty Analysis of BAG by GNSS Correction (해저지형 표면자료의 GNSS 보정방법에 따른 불확실도 연구)

  • OH, Che-Young;KIM, HO-Yong;LEE, Yun-Sik;CHOI, Chul-Uong
    • Journal of the Korean Association of Geographic Information Studies
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    • v.22 no.3
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    • pp.1-9
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    • 2019
  • In the recent marine sector, the development and standardization regarding S-100, which is the universal hydrographical data model standard for development of marine space information, was progressed, and for the effectiveness of marine chart production work and the multi-purpose use of water level data in S-100, S-102(Bathymetric Surface grid) standard development and various studies of BAG formats combined with water level and uncertainty, property information is being progressed. Since the water level information that is important in the operation of the ship is provided based on S-102, the calibration method of the location information when producing S-102 is an important factor in deciding the water level. In this study, the hydrographical surveying was conducted by piloting the standardized method for the production of S-102 in Korea, and have compared the accuracy of water level information according to the GNSS post treatment calibration method. As a result of comparing the water level in 2 places in the rocky terrain of the study area, the northern water level of Namu-do was shown as DL 0.79~0.83m, the eastern water level of Daeho-do was DL 12.63~12.91m, and the horizontal position errors of the intermittent sunshine water level were confirmed to be within 1m. As a result, the intermittent sunshine water level according to the location calibration method when producing the BAG was confirmed that it was in the available range for a ship's safe voyage. However, the accuracy verification for the location of the ship when conducting hydrographical surveying was judged that there is a need for a various additional study about regional characteristics and environment factor.

Improvement of the Beam-Wave Interaction Efficiency Based on the Coupling-Slot Configuration in an Extended Interaction Oscillator

  • Zhu, Sairong;Yin, Yong;Bi, Liangjie;Chang, Zhiwei;Xu, Che;Zeng, Fanbo;Peng, Ruibin;Zhou, Wen;Wang, Bin;Li, Hailong;Meng, Lin
    • Journal of the Korean Physical Society
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    • v.73 no.9
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    • pp.1362-1369
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    • 2018
  • A method aimed at improving the beam-wave interaction efficiency by changing the coupling slot configuration has been proposed in the study of extended interaction oscillators (EIOs). The dispersion characteristics, coupling coefficient and interaction impedance of the high-frequency structure based on different types of coupling slots have been investigated. Four types of coupled cavity structures with different layouts of the coupling slots have been compared to improve the beam-wave interaction efficiency, so as to analyze the beam-wave interaction and practical applications. In order to determine the improvement of the coupling slot to a coupled cavity circuit in an EIO, we designed four nine-gap EIOs based on the coupled cavity structure with different coupling slot configurations. With different operating frequencies and voltages takes into consideration, beam voltages from 27 to 33 kV have been simulated to achieve the best beam-wave interaction efficiency so that the EIOs are able to work in the $2{\pi}$ mode. The influence of the Rb and the ds on the output power is also taken into consideration. The Rb is the radius of the electron beam, and the ds is the width of the coupling slot. The simulation results indicate that a single-slot-type EIO has the best beam-wave interaction efficiency. Its maximum output power is 2.8 kW and the efficiency is 18% when the operating voltage is 31 kV and electric current is 0.5 A. The output powers of these four EIOs that were designed for comparison are not less than 1.7 kW. The improved coupling-slot configurations enables the extended interaction oscillator to meet the different engineering requirements better.

An Analysis of the Economic Effects of the Pilot Project for Multiple-Purpose Utilization of Paddy Fields Focusing on Income and Welfare Changes (소득 및 후생 변화를 통한 농지범용화 시범사업의 경제적 효과 분석)

  • Lim, Che hwan;Ha, Yong hyun;Kim, Do hoon;An, Dong hwan;Yi, Hyang mi;Kim, Kwansoo
    • Journal of Korean Society of Rural Planning
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    • v.28 no.2
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    • pp.71-85
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    • 2022
  • The food self-sufficiency rate of agricultural products in Korea, excluding rice, is around 20%, and the government is promoting various policies including a Multiple-Purpose Utilization of Paddy Fields project, to increase the self-sufficiency rate of major grains. The project for Multiple-Purpose Utilization of Paddy Fields is being promoted as a part of a program to create farmland infrastructure to facilitate the cultivation of crops other than rice in rice paddies, and pilot projects were started in four regions in 2020. The purpose of this study is to analyze the economic effects of the pilot project for Multiple-Purpose Utilization of Paddy Fields, and to propose policies to increase the effectiveness of the project. In order to analyze the economic effect, we estimated the change in farm income generated by switching from rice to other crops, and measured the effect of welfare change using the Equilibrium Displacement Model (EDM). As a result of the analysis, social welfare is expected to increase when the pilot project for Multiple-Purpose Utilization of Paddy Fields is implemented, and the income of the beneficiary farmers is also expected to improve compared to that of single-cropping when double-cropping is implemented. However, it was found that the economic feasibility of the project differs depending on the crops converted. Juksan-myeon, Gimje-si, which is an area where soybean production was successful, was analyzed from the viewpoint of increasing the economic feasibility of the pilot project. Their success factors were analyzed into four major factors: infrastructure, farming methods, education, and collaboration with local agricultural organizations. If such a success story can be utilized in the future project implementation process, it can contribute to the improvement of farm household income and national economic welfare.