http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
윤민중,유은아,김준영,최연주,정용욱,김성민,전상곤 한국농식품정책학회 2022 농업경영정책연구 Vol.49 No.3
The average bid price per head of domestic race horses has been sold at almost the same level for the past 10 years, and the stability of profits for horse producers is very poor. In this study, the management efficiency of domestic racehorse producers was analyzed, and based on this, a plan for efficient farmhouse management was suggested. In this study, inputoriented DEA analysis was performed on a total of 48 farms, including 42 farms in Jeju island and 6 farms in inland. As a result of the overall DEA analysis, the overall average of the technical efficiency of the rarms was 0.35, indicating that the overall management efficiency of the racehorse breeding farms was very low. If we divide this into pure technical efficiency and scale efficiency, it was analyzed that the pure technical efficiency was 0.5 and the scale efficiency was 0.67. The pure technical efficiency of farmhouses in Jeju was 0.51, slightly higher than 0.44 in the inland area, while the scale efficiency in Jeju was 0.67, slightly lower than 0.73 in the inland area. When Jeju region was divided into three groups according to total income and management efficiency index was compared accordingly, the upper group showed the highest technical efficiency with 0.49, the middle group with 0.36, and the lower group with the lowest with 0.2. Comparing the pure technical efficiency, the middle-lower group was lower than the upper-level group, indicating that measures to improve the management inefficiency of the middle-lower group are urgently needed.
윤민중 사단법인 한국동물생명공학회 2013 한국동물생명공학회지 Vol.28 No.2
The efficiency of artificial insemination (AI) for horses remains unsatisfactory. It is mainly because each process of AI causes a detrimental effect on semen quality. To sustain quality of semen properly, several factors including libido of stallions and sperm damage during sperm processing and preservation should be considered. Stallions with decent libido produce a high ratio of sperm to seminal plasma in their ejaculates, which is the ideal semen composition for maintaining sperm quality. Thus, to maximize the fertility rate upon AI, stallions should be appropriately managed to enhance their libido. Seminal plasma should have a positive effect on horse fertility in the case of natural breeding, whereas the effects of seminal plasma on both sperm viability and quality in the context of AI remain controversial. Centrifugation of semen is performed during semen processing to remove seminal plasma and to isolate fine quality sperm from semen. However, the centrifugation process can also result in sperm loss and damage. To solve this problem, several different centrifugation techniques such as Cushion Fluid along with dual and single Androcoll-ETM were developed to minimize loss of sperm and to damage at the bottom of the pellet. Most recently, a new technique without centrifugation was developed with the purpose of separating sperm from semen. AI techniques have been advanced to deliver sperm to optimal region of female reproductive tract at perfect timing. Recombinant equine luteinizing hormone (reLH) and low dose insemination techniques have been developed to maximize both fertility rate and the efficiency of AI. Horse breeders should consider that the entire AI procedure should be optimized for each stallion due to variation in individual horses for a uniformed AI protocol
윤민중,김동호,Yoon Minjoong,Chang Jae-Rim,Kim Dongho Korean Chemical Society 1988 Bulletin of the Korean Chemical Society Vol.9 No.1
The pH dependence studies of Raman spectra are reported for water-soluble free-base, Zn, Co and Cu tetrakis (4-sulfonatophenyl) porphine in pH 4, pH 7 and pH 13.9 aqueous solution. For free base porphine, the substantial differences are found in absorption and Raman spectra between pH 4 and pH 7 or pH 10 aqueous solutions due to the protonation at low pH. For Zn and Co porphyrins, the hydrolysis equilibrium constants are obtained by spectrophotometric titration experiments. The consistent shifts in Raman frequencies are found at high pH due to the hydrolysis. For Cu porphyrins, instead of hydrolysis the aggregation effect is detected at high pH through the absorption and Raman studies.
Yoon, Minjoong,Choi, Hyong Hae,Kwon, Hwang Won,Park, Koon Ha 충남대학교 기초과학연구소 1988 연구논문집 Vol.8 No.-
The spectral properties of piroxicam in different solvents are similar to those of its skeletal precursor, HMBDC. The maximum absorption and emission wavelengths strongly depend on the hydrogen bonding ability of the solvent, and it is shown that intramolecular hydrogen bonding between the OH and the ortho carbonyl group of the parent benzothiazine ring plays an important role in the solvent-dependence of their spectroscopic properties. The fluorescence spectra in aprotic nonpolar solvent exhibit abnormally large Stokes-shifted (∼9,000㎝^-1) emission bands in contrast to the spectra in water. In ethanol, dual emission bands with two different fractional components of lifetimes have been observed. These results suggest that the abnormally red-shifted emission is attributed to the proton transferred form of an intramolecularly hydrogen-bonded closed conformer.
Proton Transfer Equilibria in The Excited State of Piroxicam and Its Analog in Aqueous Solution
Yoon, Min Joong,Kim, Yong Hee 충남대학교 기초과학연구소 1990 연구논문집 Vol.10 No.-
The pH denendence of the absorption and fluorescence of 4-hydroxy-2-methy-1,2-benzothiazinencarboxylates, piroxicam and HMBDC have been measured and compared with the slovent dependence of the spectra reported previously. Four different prototropic species are observed in both ground and excited state of piroxicam; the cation, the neutral, the anion and the dianion, while three different species such as the cation, the neutral and the anion are observed in HMBDC. The pK_α and pK_α have been determined by absorptiometric titration and Fo¨rster cycle method, respectively. The probable structure of each. species has been proposed on the basis of the intramolecular phototautomerism.