• Korean Journal of Poultry Science
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• v.49 no.3
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• pp.145-156
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• 2022

The effect of paternal telomere length on reproductive performance, relationship between paternal and offspring telomere length, and association between paternal telomere length and offspring production performance were investigated in Korean native chickens. Using 22 paternal chickens and 329 offspring, the paternal reproductive performance such as fertility, embryo mortality, and hatchability, as well as the offspring production performance such as survival rate, body weight, and weight gain were analyzed. Telomere length was analyzed through quantitative fluorescence in situ hybridization using lymphocytes. No significant differences were observed in fertility, embryo mortality, and hatchability between paternal chicken telomere lengths (P<0.05). These results indicate that paternal telomere length had a weak negative correlation with fertility and embryonic death rate but a weak positive correlation with hatchability. The correlation coefficient between paternal telomere length and offspring survival rate was r=0.17 (P>0.05). The group of offspring with long paternal telomeres showed relatively poor growth performance. Moreover, a significant negative correlation was estimated between paternal telomere length and offspring growth performance (P<0.05). The correlation coefficient between paternal and offspring telomere lengths was r=0.075 (P>0.05). In conclusion, there was a weak association between paternal telomere length and reproductive performance, offspring survival rate, and offspring telomere length, respectively. However, paternal telomere length and offspring growth performance showed a negative relationship. Such results could be due to the re-extension of telomere length by telomere reprogramming in the early embryonic stage and the different degree of telomere shortening between individuals with increasing age after birth.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.35 no.2
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• pp.83-91
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• 2022

Seismic design and analysis of nuclear power plant components are performed based on an decoupled model. However, this decoupled analysis has a limitation in that it generates inaccurate results compared to the coupled analysis because it cannot simulate actual phenomena such as the interaction between structures and components. Thus, this study performed seismic coupled and decoupled analysis on an existing nuclear containment structure and related components, considering the mass and natural frequency ratios. And based on these results, comparative analyses of responses of components were conducted. Consequently, the seismic coupled analysis result generally gave a smaller value than the decoupled analysis result. These results were similar to the analysis results for the simple coupled model, which was an existing study, but the difference in component responses was much more pronounced. Also, this was influenced by the installation location of the component rather than the influence of the input frequency of the input seismic motions. Finally, the difference between the decoupled and coupled seismic analysis occurred in the region where the mass ratio of the components was large, and the natural frequencies were almost similar due to the considerable dynamic interaction between the structure and the component in this realm.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.23 no.5
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• pp.1196-1207
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• 1998

The link sublayer segmentizes a use data into several frames and transmits it through a wireless channel. In this case, the packet error probability and link throughput are affected by the frame size. And a portion of pure user data in a packet affects a link throughput. In this paper we analyze and simulate the retransmission scheme of the Wireless Local Loop(WLL) system and study the link throughput according to the payload size.

• Neonatal Medicine
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• v.17 no.1
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• pp.127-131
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• 2010

Supernumerary derivative (22) syndrome is a rare genomic syndrome. It is characterized by severe mental retardation, microcephaly, failure to thrive, preauricular tag or sinus, ear abnormalities, cleft and/or high-arched palate, micrognathia, kidney abnormalities, congenital heart defects, and genital abnormalities in males. In 99% of the cases, one of the parents is a balanced carrier of a translocation between chromosome 11 and chromosome 22. To date, there have been about 100 case reports of supernumerary derivative (22) syndrome. In most of the cases, supernumerary derivative (22) syndrome was the result of 3:1 meiotic segregation in the maternal 11;22 translocation carrier. We now report a case of 47,XX, + der(22)t(11;22)(q23;q11.2) resulting from 3:1 meiotic segregation of the paternal translocation carrier.

• 대한생식의학회:학술대회논문집
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• 1999.05a
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• pp.45-52
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• 1999

포유동물의 수정은 정자가 난자내로 침입함으로써 시작되는데 이때 정자는 부계의 유전물질 이외에도 다양한 후성적 요소들 (epigenetic factors), 즉 난활성 인자, 중심체, 부계 유래의 mitochondria 및 부계 특이 삽입 유전자 등을 난자에 전달해 준다. 하지만 수정 및 초기 배발달동안 정자에 의해 전달된 후성적 요소들의 역할과 기능적 발현 및 억제 기전에 관해서는 명확히 알려져 있지 않다. 수정보조기법인 ICSI 및 ROSI의 개발은 남성불임치료에 혁신적인 기술로 자리잡고 있을 뿐만 아니라 포유동물의 수정과정을 이해 하는데 많은 도움을 주고 있다. 본 연구실에서는 최근 몇 년간 돼지난자에 정자, 다양한 정자 구성 요소들, 정낭세포, 및 이종의 정자 등을 미세주입하여 수정을 유도한 후 핵질 및 세포질의 변화과정과 배 발달과정을 살펴 봄으로써, 수정시 정자에 의해 전달되는 후성적 요소들의 기능과 발현 기작을 규명하고자 하였다. 이러한 연구의 결과들은 체외수정, ICSI, ROSI 등의 임상치료기술의 개선에 기초자료로 활용될 수 있으리라 생각한다.

• Survey Research
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• v.13 no.1
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• pp.89-112
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• 2012

This study aims to explore emotional closeness between grandparents and grandchildren in Korean families with a focus on the lineage. The effects of the geographical proximity and the normative aspect as well as intergenerational financial, instrumental, and emotional supports were taken into consideration to accounting for the grandparent-grandchildren affective solidarity. Research questions are addressed using the data of "Survey on Generational Solidarity and Differences in Cultural Experience and Perception in Korea", and a series of multinomial regression model were conducted. Findings indicate that the salient factor to boost grandchildren's affective solidarity with paternal grandparents is financial transfers between grandparents and parents. By contrast, all types of intergenerational supports affected grandchildren's emotional closeness toward maternal grandparents. Geographical proximity was associated with the affective solidarity between grandchildren and maternal grandparents. The effects of normative solidarity were not shown at both lineages.

• KOMUNHWA
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• no.63
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• pp.43-64
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• 2004

Scholars have been discussed about Korean Family History till now, however it is very doubtful that the maternal mother's family was disregarded. Perhaps, the stem of Korean family is a patrilineal society so that the maternal mother's family was disregar

• Electronics and Telecommunications Trends
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• v.8 no.3
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• pp.1-10
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• 1993

제어 신호용 SAR 부계층 기능부는 메시지 단위로 통신을 수행하는 프로세서와 셀 단위로 전송이 이루어지는 ATM 스위치망간의 정합을 수행한다. 이 기능부는 메시지를 셀로 분할하는 분할부와 셀을 메시지로 조립하는 재결합부로 구성되어 있다. 각종 제어와 관련된 신호의 SAR 기능을 실행하는 이 부분에서 발생하는 병목현상은 전체 교환시스팀의 성능에 미치는 영향이 크다. 본 연구에서는 제어 신호용 SAR 부계층 기능부에 대한 성능 평가 모델을 제시하고 재결합부에 대한 성능 분석을 수치계산 예를 들어 설명한다.

• Korean Journal of Culture and Social Issue
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• v.28 no.4
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• pp.691-715
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• 2022

In this study, we investigated the relationship between Finsta use and perceived online social support, self-monitoring, and subjective well-being. Furthermore, we investigated whether the number of Instagram accounts mediates the relationship between self-monitoring and perceived online social support. For this reason, To this end, we conducted an online survey of 396 adults in their 20s. Results indicated that the number of Instagram accounts showed a positive correlation with perceived online social support and self-monitoring, but did not show a significant correlation with subjective well-being. Next, it was found that the higher the level of self-monitoring, the higher the probability of using of Finsta. In addition, the number of Instagram accounts was found to partially mediate the relationship between self-monitoring and perceived online social support. In other words, the higher the self-monitoring was associated with, , the more Instagram accounts were, and many Instagram accounts increased the level of perceived online social support. For the first time in Korea, this study confirmed the relationship between Finsta use and perceived online social support, self-monitoring, and subjective well-being., Also, this study was meaningful because itand explored whether self-monitoring leads to perceived online social support through the number of Instagram accounts. In addition, this studyit has social meaning in that it sheds light on how online interactions are connected to the real world.

• The Magazine of the IEIE
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• v.29 no.10
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• pp.1175-1175
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• 2002

2002년 6월, IEEE 802.3ae 10Gb/s 이더넷이 표준으로 승인되었다. 10 Gb/s 이더넷은 MAC 부계층과 물리계층을 통합한 규격으로 전이중 방식 및 광섬유 매체만을 제공한다. 기존 이더넷과 동일한 프레임 형식을 사용하고, LAN 물리계층과 WAN 물리계층까지 지원하고 있다. 따라서 LAN, MAN, WAN 영역에서 10Gb/s의 높은 속도를 제공할 수 있으며, 기존의 이더넷과 투명하게 통합할 수 있다. 본 논문에서는 10 기가비트 이더넷의 MAC 부계층과 물리계층 및 최근 기술 동향을 살펴본다.