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Effect of Calf Birth Weight on the Subsequent Fertility of Holstein Heifers
Lim, Hyun-Joo,Son, Jun-Kyu,Yoon, Ho-Beak,Baek, Kwang-Soo,Kwon, Eung-Gi 韓國受精卵移植學會 2012 한국동물생명공학회지 Vol.27 No.2
This study investigated the effect of birth weight on the fertility of Holstein heifers. Growth parameter (body weight) was measured at birth. Calves were analyzed as three subgroups: low (L), average (A) and high (H) birth weight (BW) calves. LBW calves were born 10 kg lighter than HBW calves. Fertility data collected included age at first breeding (AFB), number of services per conception, pregnancy rate to first artificial insemination (AI), and age at first calving (AFC). Primiparous calves in HBW are smaller compared to multiparous cows (18.3% versus 48%). Although not significantly different, LBW offspring appeared to breed faster over the service period compared with the ABW offspring that bred three weeks later on the average. The mean pregnancy rate to first AI for LBW heifers was higher (60%) than ABW (48%) and HBW (45%). HBW cows required more services per conception (2.1) than the LBW (1.7) and ABW (1.9). There were significant differences (p<0.05) in age at first calving among the different calving birth weights. Smaller birth size did not have any subsequent adverse effects on fertility. HBW offspring were more likely or tend to have worse fertility parameters.
A Study on the Installation of a Barrier to Prevent Large-Scale Traffic Accidents in Tunnel
Baek, Se-Ryong,Yoon, Jun-Kyu,Lim, Jong-Han The Institute of Internet 2019 International journal of advanced smart convergenc Vol.8 No.4
Traffic accidents in tunnel can lead to large traffic accidents due to narrow and dark road characteristics. Therefore, special care of the driver is required when is driving in a tunnel. However, accidents can happen at any time. In the event of an accident, a narrow road structure may lead to a second accident. Therefore, all facilities installed inside the tunnel should be allowed to minimize damage in the event of an accident. We confirmed the safety of the collision target through the action of the sedan, Sport Utility Vehicle (SUV) and truck when the vehicle crashed into a stairway installed on the tunnel emergency escape route, and when a concrete barrier or guard rail was installed in front of the stairway. The behavior of the vehicle has resulted in a total of three results: rollover or rollover, change of speed and angle of the vehicle after collision. The sedan and SUV were the most secure when colliding with the guardrail, but considering the truck as a whole, concrete barriers were judged to be the most suitable for minimizing damage from the first accident and reducing the risk of the second accident.
A 5.8-Gb/s Adaptive Integrating Duobinary DFE Receiver for Multi-Drop Memory Interface
Lim, Hyun-Wook,Choi, Sung-Won,Ahn, Jeong-Keun,Min, Woong-Ki,Lee, Sang-Kyu,Baek, Chang-Hoon,Lee, Jae-Youl,Hwang, Gyoo-Cheol,Jun, Young-Hyun,Kong, Bai-Sun Institute of Electrical and Electronics Engineers 2017 IEEE journal of solid-state circuits Vol. No.
<P>This paper describes a 5.8 Gb/s adaptive integrating duobinary decision-feedback equalizer (DFE) for use in next-generation multi-drop memory interface. The proposed receiver combines traditional interface techniques like the integrated signaling and the duobinary signaling, in which the duobinary signal is generated by current integration in the receiver. It can address issues such as input data dependence during integration, need for precursor equalization, high equalizer gain boosting, and sensitivity to high-frequency noise. The proposed receiver also alleviates DFE critical timing to provide gain in speed, and embed DFE taps in duobinary decoding to provide gain in power and area. The adaptation for adjusting the equalizer common-mode level, duobinary zero level, tap coefficient values, and timing recovery is incorporated. The proposed DFE receiver was fabricated in a 45 nm CMOS process, whose measurement results indicated that it worked at 5.8 Gb/s speed in a four-drop channel configuration with seven slave ICs, and the bathtub curve shows 36% open for 10(-10) bit error rate.</P>
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.
Lim, Joon Seok,Kim, Daehong,Baek, Song-Ee,Myoung, Sungmin,Choi, Junjeong,Shin, Sang Joon,Kim, Myeong-Jin,Kim, Nam Kyu,Suh, Jinsuk,Kim, Ki Whang,Keum, Ki Chang Springer International 2012 EUROPEAN RADIOLOGY Vol.22 No.8
<P>To evaluate the utility of perfusion MRI as a potential biomarker for predicting response to chemoradiotherapy (CRT) in locally advanced rectal cancer.</P>
Effect of Preantral Follicle Isolation Technique on In Vitro Follicular Development in Mice
Lim, Hyun-Joo,Kim, Dong-Hoon,Im, Gi-Sun,Park, Sung-Jai,Son, Jun-Kyu,Baek, Kwang-Soo,Kwon, Eung-Gi 韓國受精卵移植學會 2011 한국동물생명공학회지 Vol.26 No.4
The objective of this study was to compare of different isolation method of mouse preantral follicles, and to examine in vitro development of mouse preantral follicles isolated by different method. Preantral follicles were mechanically or enzymatically extracted from mouse ovaries. Mechanical isolation method used fine gauge needles and enzymatic method of isolating follicles used collagenase. The recovered preantral follicles were cultured for 10 days in alpha-minimal essential medium (-MEM) + 5% FBS + Insulin-Transferrin-Selenium (ITS) + 100 mIU/ml FSH. The collected primary follicles by enzymatic treatment were higher than mechanical method. Others stage preantral follicle by mechanical isolation were higher than enzymatic method. After 10 days of culture, no statistical differences were shown in survival rates of preantral follicle among the 2 culture groups. The metaphase II rates of the oocytes were significantly higher (p<0.05) in mechanical method (17.8%) than in enzymatic method (5.1%). These results suggest that the isolation method of choice depends on the target stage preantral follicles and mechanical isolation is an optimal method of preantral folliclesin a culture of mouse preantral follicle.
Lim, Sang-Soon,Kim, Byung Kyu,Kim, Seong Keun,Park, Hyung-Ho,Kim, Dong-Ik,Hyun, Dow-Bin,Kim, Jin-Sang,Baek, Seung-Hyub Elsevier 2017 JOURNAL OF ALLOYS AND COMPOUNDS Vol.727 No.-
<P><B>Abstract</B></P> <P>It is challenging to improve the thermoelectric figure-of-merit as its constituent terms such as Seebeck coefficient, electrical conductivity, and thermal conductivity, are inter-related in the way that the enhancement of one term leads to the degradation of others. Therefore, it is highly desirable to design a new synthesis process that allows us to independently control these terms. Here, we report a simple, two-step process combining spark plasma sintering (SPS) and post-annealing (PA) to separately control the carrier density and mobility in the p-type (Bi<SUB>0.2</SUB>Sb<SUB>0.8</SUB>)<SUB>2</SUB>Te<SUB>3</SUB>. High-temperature SPS enables enhancing the carrier mobility by reducing scattering sites such as grain boundaries. Then, the following PA at a lower temperature allows tailoring the carrier density without the degradation of mobility. Beyond bismuth telluride-based, room-temperature thermoelectric materials, we believe that our result will provide an insight for the performance enhancement of other thermoelectric materials such as oxide and skutterudite.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A two-step process is proposed to separately control the carrier density and the mobility. </LI> <LI> High-temperature spark plasma sintering is used to enhance the carrier mobility. </LI> <LI> The following low-temperature post-annealing can optimize the carrier density. </LI> </UL> </P>