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Survey on the Incidence of Reproductive Disorders in Dairy Cattle
Hyun-Joo Lim,Ho-Beak Yoon,Jihoo Park,Yong-il Cho,Harim Im,Yeon-Seop Jeong,Kwang-Seok Ki,Seok-Ki Im 한국수정란이식학회 2015 한국동물생명공학회지 Vol.30 No.1
genetic selection has resulted in modern dairy cow with very high milk yields but reduced fertility, due mainly to an increase in reproductive disorders. The study was conducted to estimate the proportion of reproductive disorders among dairy cattle. The factors analyzed were; milk yield, cow parity, periparturient disorders, and reproductive status. The result of this study showed the incidence of reproductive disorders in high yielding dairy cows was prevalent. Repeat breeding was the major postpartum reproductive problem comprising (42.3%) of the samples. Higher reproductive disorders were also associated with lower parity. These disorders subsequently reduced reproductive performance by prolonged intervals from calving to first artificial insemination and from calving to pregnancy. Abnormalities in the reproductive system such as repeat breeder, silent heat, anestrous and ovarian cysts, as well as lower fertility have been recorded during the summer months (June to August). In conclusion, the study revealed that incidence of repeat breeder is mostly prevalent in dairy cows. Moreover, the incidence of reproductive disorders was higher in summer season and hence appropriate preventive and or therapeutic measures as per the type of abnormalities need to be undertaken.
김일동 ( Il Dong Kim ),이상현 ( Sang Hyun Lee ),백지영 ( Ji Young Beak ),조성진 ( Sung Jin Cho ) 대한산부인과학회 2005 Obstetrics & Gynecology Science Vol.48 No.3
Pregnancy and the puerperium are associated with an increased risk of stroke, and stroke is considered an important cause of maternal morbidity and mortality during this time. Pregnancy and delivery can lead to substantial alterations in systemic arterial
Survey on the Incidence of Reproductive Disorders in Dairy Cattle
Lim, Hyun-Joo,Yoon, Ho-Beak,Im, Harim,Park, Jihoo,Cho, Yong-il,Jeong, Yeon-Seop,Ki, Kwang-Seok,Im, Seok-Ki The Korean Society of Embryo Transfer 2015 한국동물생명공학회지 Vol.30 No.1
Intensive genetic selection has resulted in modern dairy cow with very high milk yields but reduced fertility, due mainly to an increase in reproductive disorders. The study was conducted to estimate the proportion of reproductive disorders among dairy cattle. The factors analyzed were; milk yield, cow parity, periparturient disorders, and reproductive status. The result of this study showed the incidence of reproductive disorders in high yielding dairy cows was prevalent. Repeat breeding was the major postpartum reproductive problem comprising (42.3%) of the samples. Higher reproductive disorders were also associated with lower parity. These disorders subsequently reduced reproductive performance by prolonged intervals from calving to first artificial insemination and from calving to pregnancy. Abnormalities in the reproductive system such as repeat breeder, silent heat, anestrous and ovarian cysts, as well as lower fertility have been recorded during the summer months (June to August). In conclusion, the study revealed that incidence of repeat breeder is mostly prevalent in dairy cows. Moreover, the incidence of reproductive disorders was higher in summer season and hence appropriate preventive and or therapeutic measures as per the type of abnormalities need to be undertaken.
수정된 증발법을 이용하여 제작된 주석 나노입자의 녹는점 강하에 관한 연구
김현진(Hyun Jin Kim),백일권(Il Kwon Beak),김규한(Kyu Han Kim),장석필(Seok Pil Jang) 대한기계학회 2014 大韓機械學會論文集B Vol.38 No.8
본 논문에서는 수정된 증발법을 이용하여 제작된 주석(Sn) 나노입자의 녹는점 강하 특성에 대한 연구를 진행하였다. 이를 위해 대량생산이 가능한 수정된 증발법을 이용하여 10nm 급 주석 나노입자를 제조하였다. 주석 나노입자 표면의 산화 방지를 위하여 Benzyl Alcohol 을 기본유체로 사용하였으며, 제작된 주석 나노입자의 형상과 입자크기를 알아보기 위하여 투과전자현미경(TEM)을 사용하였다. 제작된 나노입자의 녹는점은 시차주사열량계(DSC)를 통해 측정하였으며, 광전자분광분석기(XPS)를 사용하여 제작된 주석 나노입자의 성분 분석을 진행 하였다. 주석 나노입자의 녹는점은 주석의 녹는점인 232℃보다 44% 감소한 129℃로 측정되었다. 녹는점 측정 결과는 Gibbs-Thomson 식 및 Lai 의 식 과 비교하였으며, 그 결과 Lai 의 식이 실험결과를 잘 예측함을 확인할 수 있었다. In the present study, the melting temperature depression of Sn nanoparticles manufactured using the modified evaporation method was investigated. For this purpose, a modified evaporation method with mass productivity was developed. Using the manufacturing process, Sn nanoparticles of 10 nm size was manufactured in benzyl alcohol solution to prevent oxidation. To examine the morphology and size distribution of the nanonoparticles, a transmission electron microscope was used. The melting temperature of the Sn nanoparticles was measured using a Differential scanning calorimetry (DSC) which can calculate the endothermic energy during the phase changing process and an X-ray photoelectron spectroscopy (XPS) used for observing the manufactured Sn nanoparticle compound. The melting temperature of the Sn nanoparticles was observed to be 129 ℃, which is 44 ℃ lower than that of the bulk material. Finally, the melting temperature was compared with the Gibbs Thomson and Lai"s equations, which can predict the melting temperature according to the particle size. Based on the experimental results, the melting temperature of the Sn nanoparticles was found to match well with those recommended by the Lai"s equation.
Physical Properties of Estrus Mucus in Relation to Conception Rates in Dairy Cattle
Lim, Hyun-Joo,Son, Jun-Kyu,Yoon, Ho-Beak,Baek, Kwang-Soo,Kim, Tae-Il,Jung, Yeon-Sub,Kwon, Eung-Gi 韓國受精卵移植學會 2014 한국동물생명공학회지 Vol.29 No.2
The study aimed to determine the physical characteristics of estrus mucus and conception rates in dairy cattle. Samples of estrus mucus from the cervix were collected from 108 dairy cattle during heat and were examined for color and consistency. Samples were taken from bred animals at starting from day of breeding to the completion of one estrus cycle. The color of the cervical mucus was studied based on its transparency while the consistency was based on the thinness and thickness of the cervical mucus. The dairy cattle were bred and the pregnancy diagnosis was performed at the 60th day post breeding. Findings showed that the estrus mucus of the dairy cattle was transparent in 58.3%, turbid in 31.5% and dirty in 10.2%. It was further observed that the mucus consistency of the dairy cattle was thin in 74.1% and thick in 25.9%. In the pregnant group, 67.3% mucus samples were found transparent, turbid in 23.6% and dirty in 9.1%. However, the corresponding figures for the non-pregnant group had 49.1%, 39.6% and 11.3%. The consistency of cervical mucus was found to be thin in 74.1% and thick in 25.9% of dairy cattle. The conception rates of dairy cattle with thin and thick consistency of cervical mucus were 81.8% and 18.2%, respectively. Pregnant was associated with consistency of cervical mucus (p<0.10). Findings indicated that dairy cattle with thin consistency of cervical mucus and had clear discharge were pregnant cows.
SiO2 나노입자가 분산된 TiO2 나노섬유의 제작 및 광촉매 특성 분석
최광일 ( Kwang Il Choi ),이우형 ( Wooh Young Lee ),백수웅 ( Su Wung Beak ),송진호 ( Jin Ho Song ),이석호 ( Suk Ho Lee ),임철현 ( Cheol Hyun Lim ) 한국화학공학회 2014 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.52 No.5
본 연구에서는 전구체 각각의 독립제어가 가능한 이성분계 금속산화물을 얻기 위해 졸-겔법으로 합성한 실리카 나노입자를 TiO2 전구체와 교반시켜 전기방사법을 이용하여 실리카가 고르게 분산된 TiO2 나노섬유를 성공적으로 제작하였다. 제작된 나노섬유는 FE-SEM, XRD, EDS를 이용해 구조적 특성분석과 UV-VIS, 광촉매 반응기를 통해 광촉매특성 분석을 하였다. 그 결과, 실리카가 분산된 TiO2 나노섬유는 실리카가 분산되지 않은 TiO2 나노섬유 보다 광촉매효율이 10% 가량 향상되었다. 이는 실리카 나노입자가 첨가됨으로써 TiO2가 흡수하지 못하는 380~440 nm 가시광선영역을 흡수하여 광학적 특성 향상되었으며 Ti와 Si 두 금속산화물간에 Brønsted acid site가 생성되어 OH 라디칼을증가시킴으로써 광조사에 의해 여기된 전자를 잡아 재결합 손실을 억제하는 역할을 하여 화학적 특성이 개선되어 광촉매 효율이 증가되었을 것으로 사료된다. In this study, we suggest a facile method to control conditions of single component independently when preparingconsisting two-component metal oxides nanofiber by simply dispersing nanoparticles in precursor solution. Thewell dispersed SiO2 nanoparticles in TiO2 nanofibers were successfully synthesized through a simple electrospinningprocess. The as-synthesized nanodfibers were investigated via FE-SEM, XRD and EDS for structural studies, furthermore,the analysis of UV-VIS and photocatalytic activity were carried out for demonstrate the effect of SiO2 nanoparticles dispersedin TiO2 nanofibers. As a result, TiO2 nanofibres dispersed with SiO2 nanoparticles have enhanced photocatalytic activitythan that of TiO2 nanofibres only. In this strategy, the introduction of SiO2 nanoparticles in TiO2 nanofibers were attribute toenlarge absorption in the visible region (380~440 nm). Additionally, Brønsted acid sites generated in each metal oxide ofTi and Si increase OH radicals efficiently as well as it limit recombination loss by holding photogenerated electrons forhigh efficient photocatalytic activity.