• The Journal of the Korea institute of electronic communication sciences
• /
• v.16 no.4
• /
• pp.749-754
• /
• 2021

In order to solve problems such as a decrease in the agricultural population and an aging population, research on agricultural robots is being actively conducted for the purpose of automating various agricultural tasks. The harvesting process is the most labor-intensive process among farm work and this process consumes about 2-3 times more compared to other processes. Since the transport of agricultural crops requires the most labor costs and there is a risk of injury during the operation, automating the transport operation through an agricultural robot can improve safety and significantly improve productivity. Therefore, this paper proposes an agricultural robot that is optimized for farm worksites and capable of autonomous driving.

• Korean Journal of Poultry Science
• /
• v.50 no.1
• /
• pp.23-30
• /
• 2023

This study was conducted to analyze the correlation between egg breakage rate and cumulative external forces on eggs during the egg transfer system in 12 commercial layers farms. The commercially available electronic egg device was used to detect the external forces on eggs during egg collection systems. In addition, egg breakage rate per farm was collected. It was found that the external force on eggs were greater in the order of washer and dryer connection part, conveyor connection part, transfer, sorter, collecting elevator, packer, egg transfer connection part, and egg tray. A positive relationship between the external forces on eggs during egg transit system and the incidence of cracked eggs per farm was noted. The external forces on eggs varied from 5G to 38G depending on the location and the egg breakage rate ranged from 3.2 to 14.5% per farm. Although efforts to produce eggs with high eggshell quality are considered important, extra care should be made to lower the external forces on eggs during the egg transfer system from laying house to egg packing center.

• Journal of Power Electronics
• /
• v.15 no.4
• /
• pp.1047-1053
• /
• 2015

A time-domain simulation tool to predict the dynamic power output of wind turbines in an offshore wind farm was developed in this study. A wind turbine model consisting of first or second order transfer functions of various wind turbine elements was combined with the Ainslie's eddy viscosity wake model to construct the simulation tool. The wind turbine model also includes an aerodynamic model that is a look up table of power and thrust coefficients with respect to the tip speed ratio and pitch angle of the wind turbine obtained by a commercial multi-body dynamics simulation tool. The wake model includes algorithms of superposition of multiple wakes and propagation based on Taylor's frozen turbulence assumption. Torque and pitch control algorithms were implemented in the simulation tool to perform max-Cp and power regulation control of the wind turbines. The simulation tool calculates wind speeds in the two-dimensional domain of the wind farm at the hub height of the wind turbines and yields power outputs from individual wind turbines. The NREL 5MW reference wind turbine was targeted as a wind turbine to obtain parameters for the simulation. To validate the simulation tool, a Danish offshore wind farm with 80 wind turbines was modelled and used to predict the power from the wind farm. A comparison of the prediction with the measured values available in literature showed that the results from the simulation program were fairly close to the measured results in literature except when the wind turbines are congruent with the wind direction.

• Asian-Australasian Journal of Animal Sciences
• /
• v.7 no.1
• /
• pp.1-17
• /
• 1994

There are several gene transfer methods available to introduce foreign DNA into animal. The most common method at present is microinjection. However, the overall efficiency of producing practical application of gene transfer technology to livestock species is production of pharmaceuticals. Rare human proteins, which cannot be produced into milk of transgenic animals. Large amount of biologically active protein may be obtained from transgenic farm animals using this system. Growth-related application to livestock species using growth hormone genes or factor genes have been disappointing. There were many undesirable side effects noted in the transgenic animals. More sophisticated on or off transgene expression are needed to control expression of transgenes in the transgenic animals. Turning positive effects while circumventing potentially harmful effects.

• Asian-Australasian Journal of Animal Sciences
• /
• v.19 no.3
• /
• pp.341-346
• /
• 2006

Despite many studies, results of superovulation protocols are not consistent in farm animals. In this study, 151 Boer goats were superovulated to examine the factors affecting superovulation and embryo transfer (MOET). An optimal regime for superovulation treatment was identified as a 4-day treatment with decreasing dosages of 6-7 mg Chinese FSH or 240 mg Canadian FSH. The 4-day treatment with decreasing dosages of 6-7 mg Chinese FSH was, therefore, adopted to study effects of the age of does, season and repeated treatments on superovulation and embryo transfer. The best season for superovulation and embryo transfer and pregnancy was autumn, and the best age range was 12-35 months old. Within animals there were no significant differences in the number of ovulations and the rate of transferable embryos between the first and the second superovulation. However, these parameters declined significantly for the third superovulation. No marked effects of the number of ovulations on the proportion of transferable embryos were noted. The parturition rate of the recipients receiving single embryos was not different significantly from those receiving two embryos, and the kidding rate calculated from embryos transferred did not differ significantly between recipients receiving one and two embryos.

• Journal of Agricultural Extension & Community Development
• /
• v.20 no.4
• /
• pp.839-869
• /
• 2013

Since opening the domestic food markets after late 1980s, Korean agro-food sector has been changed a lot, including commercialization of livestock and horticulture sectors. The large-scale periodic transactions appeared in food retail market in 1990's demand further commercialization of farm sectors. It require comprehensive on-farm knowledges including production, food processing, marketing, and management for agricultural sector. As the result, The Farming Systems Research & Extension concept has been introduced in 1992 as a form of The Regional Specialization Experiment Station. The Science and Technology Committee for Agriculture, Forestry, Fisheries, and Foods are established in 2009. However, we still find gaps between on-farm knowledge demands and supply, requiring further refining of R&D systems. It also asks to differentiate applied research from basic disciplinary research, better linkages between research and extension on farm, and comprehensive knowledge transfer systems. This study recommends for proper role allocation and cooperative structures for regional research and extension institutions to reduce overlaps among them. It further asks government to support regional research and extension systems including human resource and infrastructure building, to strengthen commodity based on-farm research and extension, and to separate budget allocation for regional research and extension. Provincial administration of the county level extension offices should also be considered for better linkage between research and extension at regional level.

• The Journal of the Korea institute of electronic communication sciences
• /
• v.8 no.12
• /
• pp.1917-1922
• /
• 2013

The objective of this study is developing urban farm management system based on USN for remote monitoring and control. This system makes it easy to manage urban farm and make the database of collected information for to build the best environment for growing crops. For this, we build a green house and installed several types of sensors and camera through which the remote sensing information collected. In addition, building a web page for user convenience and information in real time to enable control. We confirmed experimentally all functions related to stability for a long period of time through field tests such as collection and transfer of information, environmental control in green house. It will be convenient for farmers to grow crops by providing the time and space constraints and a lot of flexibility. In addition, factory, office, home like environment, including facilities for it will be possible to extend.

• Korean Journal of Veterinary Research
• /
• v.50 no.3
• /
• pp.239-246
• /
• 2010

Among 203 avian pathogenic Escherichia coli (APEC) isolated from poultry with colibacillosis in korea, 14 isolates were selected from total 68 isolates transferred R plasmid and classified into 5 groups on the basis of antimicrobial minimal inhibitory concentration (MIC) pattern, farm source and O serotype. An association between clonal origin and R plasmid of them was investigated by R plasmid profile, restriction endonuclease analysis and pulsed-field gel electrophoresis (PFGE). The strains that showed the same or very similar antimicrobial MIC pattern, but different farm source and O serotype, revealed different PFGE pattern, which seemed to be different clonal origin. And the strains that showed the same MIC pattern and O serotype, revealed different PFGE pattern, seemed to be originated from different clone. Also the strains showing the same MIC pattern and farm source, but different O serotype, revealed to be different clonal origin. The strains that showed the same or similar MIC pattern, farm source, and O serotype, revealed identical or similar PFGE pattern, which seemed to belong to be one clone. Meanwhile, horizontal transfer of R plasmid seems to be common in APEC with regardless of O serotype and clone of the strains. These results indicate that rapid and accurate epidemiological survey of APEC can be possible by the combination of O serotyping, plasmid profiling and PFGE analysis following the classification of them into groups of antimicrobial drug resistance pattern.

• Proceedings of the Korean Society for Agricultural Machinery Conference
• /
• 2017.04a
• /
• pp.172-172
• /
• 2017

최근 급변하는 농촌인구 감소와 고령화로 인한 농업농촌의 경쟁력 향상을 위해 농업에 정보통신기술(ICT)을 접목한 스마트 팜 기술개발이 추진되고 있다. 현재 농촌진흥청에서는 한국형 스마트 팜 ICT 기자재 표준규격을 개발하고 단체 표준을 제정하고 있다. 개발된 시설원예용 기자재 중 센서 13종, 구동기 9종 그리고 환경제어용 3종 등 총 25종의 표준규격에 대한 검정이 요구되어, 표준규격 부합 여부를 객관적으로 확인하기 위한 검인증 체계 구축을 필요로 하게 되었으며 본 연구에서는 표준규격이 설정된 기자재에 대한 검인증방법과 계측시스템을 구성하여 검인증체계를 구축하고자 하였다. 센서 13종 중 온도센서는 비교시험을 하기위해 기준 온도센서가 정밀도는 $0.01^{\circ}C$, 정확도는 ${\pm}0.01^{\circ}C$를 갖는 것으로 선정하고 항온조는 작동범위가 온도는 $(-)50{\sim}(+)120^{\circ}C$, 습도는 (30 ~ 98)%R.H.로 조절이 되는 구조의 것으로 구성하여 기준센서와 오차정도를 산출하는 방법으로 실시할 것이며, 센서 인터페이스 등 구조는 T.T.A. 단체 표준에 적합여부를 확인하여 적합성 여부를 판단하고 현재까지 센서 13종과 구동기 9종에 대한 검정방법 제정을 추진하고 있다. 지금까지는 스마트 팜 중 시설원예용 기자재 표준규격 부합여부를 확인하는 수준이지만 향후 개별 성능확인 호환성 확인시험방법을 추가하여 고도화를 추진 하고자 한다.

• Journal of Embryo Transfer
• /
• v.32 no.2
• /
• pp.59-64
• /
• 2017

Embryo transfer (ET) could be a relevant tool for genetic improvement programs in horses similar to those already underway in other species and produce multiple foals from the same mare in one breeding season. However, there have been no reports describing equine embryo transfer performed in Korea. In the present study, we performed an equine embryo collection and transfer procedure for the first time. We examined the embryo collection and pregnancy, size of embryo during the incubation period after collection, and progesterone (P4) and estradiol-$17{\beta}$ (E2) concentrations in mare's serum at embryo collection and transfer. A total of 16 donors responded to estrus synchronization; estrus was induced in 12 donors and 4 recipients, and artificial insemination was successful in 10 donors and six blastocysts were collected from donors. Of these blastocysts, we monitored the size of blastocysts for 3 day during incubation and transferred 2 blastocysts to a recipient, with 1 successful pregnancy and foal achieved. The dimensions of equine embryo at day 7 to day 9 were $409{\mu}m$, $814{\mu}m$ and $1,200{\mu}m$. The serum P4 and E2 concentrations were $7.91{\pm}0.37ng/{\mu}L$ and $45.45{\pm}12.65ng/{\mu}L$ in the donor mare, and 1$6.06{\pm}3.27ng/{\mu}L$ and $49.13{\pm}10.09ng/{\mu}L$ in the recipient mare.