• Korean Journal of Agricultural and Forest Meteorology
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• v.14 no.4
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• pp.229-235
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• 2012

This study was conducted to investigate the climatic factors affecting bud phenology of Pinus densiflora provenances. Data were collected from Jungseon, Chungju and Jeju plantations which were parts of the 11 provenance trials established by Korea Forest Research Institute in 1996. The 36 provenances were included in this trial ($33^{\circ}30^{\prime}{\sim}38^{\circ}08^{\prime}$ in latitude and $126^{\circ}30^{\prime}{\sim}129^{\circ}20^{\prime}$ in longitude). The bud swelling date and bud burst date of the provenances were investigated from March to May in 2004 in two-day interval. The four geographic factors and fifteen climatic factors of the test sites and provenances were considered in this study. Canonical correlation analysis was conducted to examine the major factors affecting the bud phenology. Our results suggested that the major factors affecting the timing of bud swelling and burst are the differences in latitude, longitude, extremely low temperature (during December-February), extremely high temperature (during November-February) and annual mean growing days between test plantation and provenance. The provenances with lower winter temperature than that of plantation showed the faster bud swelling and bud burst. Based on these results, the implication on the seed transfer of P. densiflora was discussed.

• Journal of Animal Science and Technology
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• v.50 no.6
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• pp.747-752
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• 2008

This study was carried out to calculate genetic trends on racing speed traits of Thoroughbred racehorses, using a total 208,043 racing records of 9,934 heads collected from January, 1990 to December, 2006 in Gwacheon racecourse. Repeated time, winning time and annual best time were used racing speed traits. The estimated heritabilities and repeatabilities for repeated time, winning time and annual best time were 0.288, 0.275, 0.341 and 0.502, 0.475, 0.496, respectively. Average phenotypic improvement per race year for racing speed traits were ranged from －0.115 to 0.148 second. The other side, the genetic improvement per race year for repeated time was －0.027 second but winning time and annual best time were not shown consistent trends. Therefore, we concluded that repeated time is recommended improvement trait of Thoroughbred racehorses.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.18 no.8
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• pp.1811-1817
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• 2014

In this paper, a PID controller with interpolated gains by use of neural networks is proposed for the formation control problem that following robots track a leading robot with constant distances and angles when there are changes in the mass of the following robot. The whole control system is composed of a kinematic controller and a dynamic controller considering the robot dynamics. The dynamic controller is the PID controller with varying gains, and the proper gains are obtained for some representative masses of the follower robot by the genetic algorithm. Neural networks is trained using the genetic algorithm with the gain data obtained in the previous step. The trained neural network determines optimal PID gains for a random mass of following robot. Simulation studies show that for arbitrary masses of the tracking robot, the PID controller with interpolated gains by the trained neural network has better tracking performance than that of the PID controller with fixed gains.

• Korean Journal of Environmental Biology
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• v.38 no.4
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• pp.650-657
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• 2020

We conducted a phylogeographic analysis of Korean endemic Zacco koreanus populations inhabiting the East-flowing river (Gangneung Yeongokcheon; GY, Yangyang Namdaecheon; YN), the Han River (Seomgang; SG, Soksacheon; SS), and the Nakdong River(Gilancheon; GA) using the mitochondrial DNA cytochrome oxidase I (COI) gene (619 bp). Population genetic analysis was further performed to assess the population connectivity for the GY river where there is a large number of human-made artificial weirs with several fishways. The phylogeographic analysis revealed that while the populations of the East-flowing river and those of the Han River formed a monophyletic lineage, the Nakdong River individuals represented a distinct lineage with 3.7-4.2% (mean=4.0%) genetic distance from the other lineages. The population genetic analysis of the GY showed that a mid-stream population harbored relatively higher mitochondrial diversity relative to up- and down-stream populations, and there was no genetic differentiation between these three populations. The latter findings might suggest high genetic connectivity between the populations via genetic flow along the fishways. However, an analysis using faster-evolving genetic markers, such as microsatellites, is needed to confirm the findings of high population connectivity. Our study suggests the possibility of the presence of cryptic species in Z. koreanus in the Nakdong River basin. However, further study with more individual samples as well as additional markers or even more advanced genomic tools is required to test our hypothesis. Ecological or phenotypic analyses should be conducted to test whether the observed Nakdong River lineage represents a different or cryptic species, or simply hidden, but excessive, intraspecific diversity.

• The KIPS Transactions:PartB
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• v.18B no.2
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• pp.67-72
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• 2011

Single nucleotide polymorphisms (SNPs) are a very important tool for the study of human genome structure. Cluster analysis of the large amount of gene expression data is useful for identifying biologically relevant groups of genes and for generating networks of gene-gene interactions. In this paper we compared the clusters of SNPs within asthma group and normal control group obtained by using hierarchical cluster analysis method with entropy distance. It appears that the 5-cluster collections of the two groups are significantly different. We searched the best set of SNPs that are useful for diagnosing the two types of asthma using representative SNPs of the clusters of the asthma group. Here support vector machines are used to evaluate the prediction accuracy of the selected combinations. The best combination model turns out to be the five-locus SNPs including one on the gene ALOX12 and their accuracy in predicting aspirin tolerant asthma disease risk among asthmatic patients is 66.41%.

• Korean Journal of Plant Resources
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• v.19 no.1
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• pp.150-160
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• 2006

This study was performed to provide basic information of the development and breeding of new cultivars of Hibiscus syriacus L., which have more beautiful and diverse flowers. Morphological characteristics of the leaves and genetic variation of the leaves of two Jeoktanshim-line cultivars, Bulsae and Pyungsung, were crossed each other. The result of the cross between Bulsae and Pyungsung are as follows: Mean leaf length and width were 6.09cm and 3.36cm, respectively. Mean petiole length was 1.08cm, and mean shoulder width and incision depth were 1.50cm and 0.84cm, respectively. Mean leaf base angle was $98.56^{\circ}$. Leaf index and petiole length were the most important components of leaf characteristics. Two groups were clustered in distance level 5.4. The result of the cross between Pyungsung and Bulsae are as follows: Mean leaf length and width were 5.25cm and 3.10cm, respectively. Mean petiole length was 0.87cm, and mean shoulder width and incision depth were 1.50cm and 0.76cm, respectively. Mean leaf base angle was $107.87^{\circ}$, which was the widest among ten cross combinations. Two groups were clustered with seven leaf characteristics in distance level 4.2. Group I included two small groups, and group II included four small groups.

• Korean journal of applied entomology
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• v.58 no.2
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• pp.133-142
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• 2019

This study analyzed genetic variation of the Oriental fruit fly (OFF), Bactrocera dorsalis, which is designated to be a quarantine insect pest in Korea. OFF samples endemic to Taiwan were collected at three different locations (Taipei, Taichung, and Kaohsiung) for three days from July 30 to August 1 in 2018 and assessed in their age and mitochondrial DNA sequence variations. In these places, 1,085 OFF males were collected using methyl eugenol lure while 30 males of Zeugodacus cucurbitae and one male of Bactrocera tau were collected using Cuelure. A protein diet lure attracted 6 flies including one OFF and 5 flies of Z. cucurbitae. Male heads of OFF contained pterin, which increased in contents with age from 32 to $59{\mu}g/head$. There was a local variation in pterin amounts in OFF heads, in which Kaohsiung population had lower amounts of pterin than Taipei and Taichung populations. Genetic distance among these three populations were measured by random amplified polymorphic DNA and showed that Taipei population was separated from Taichung/Kaohsiung cluster. Genetic variation was also analyzed in sequence variations in cytochrome oxidase I (CO-I) and NADH dehydrogenase I (ND-I). There was 7.8% variation in CO-I sequence (360 residues) and 6.6% variation in ND-I sequence (213 residues). These polymorphic sites are proposed to be used to develop SNP (single nucleotide polymorphism) markers characteristic to Taiwan OFF populations.

• Journal of the korean academy of Pediatric Dentistry
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• v.33 no.1
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• pp.103-108
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• 2006

Loss of permanent molar by multiple dental caries traumatic influence or hereditable disease can cause loss of the vertical dimension in children. However traditionally reconstructive treatment to restore vertical dimension in children has been provided by using simple methods such as celluloid crown form and stainless steel crown. The presented case report describes an alternative treatment modality of vertical dimension by using removalbe appliance This appliance is made with average of facial height and maximal clenching force by using T-scan.

• Electrical & Electronic Materials
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• v.6 no.5
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• pp.461-469
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• 1993

본 논문에서는 대기상태에서 불평등 전계를 형성하는 봉대봉 전극사이에 절연판 장벽을 삽입하였을 때 절연특성이 개선되는 장벽효과를 실험적으로 연구하였다. 본 실험에서 전극사이에 각각 절연 장벽을 삽입하였을 때와 삽입하지 않았을 때의 섬락정압을 측정하고 또 여러 종류의 장벽 재료에 대해 장벽의 높이와 두께를 변화 시켰을 때의 섬락전압을 측정함으로써 장벽효과를 연구 검토하였다. 실험결과, 절연체 장벽을 각각 삽입하였을 때와 삽입하지 않았을 때의 섬락전압의 비는 1.3-2.0 정도임을 확인하였고 또한 장벽의 높이가 전극간 거리와 같아질 때까지는 섬락전압이 상승하였으나 그 이상일 때에는 변화하지 않음을 알 수 있었다. 또 장벽이 두꺼울수록, 장벽 재료의 유전율이 작아질수록 섬락정압이 상승하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2001.05a
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• pp.493-496
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• 2001

본 논문에서는 선박에서 사용하는 유수 경계면 및 온도 검출기 센싱 모듈을 설계하였다. 설계된 모듈들은 구체적으로 세부분으로 나눌 수 있다. 첫째는 유수 경계면 검출부분이고, 둘째는 온도 건출부분, 셋째는 전체를 제어하는 제어부분으로 나눌 수 있다. 처음으로 유수 경계면 검출부분은 각 물질의 고유한 유전율을 이용하여 설계하였다. 이것을 이용하여 추출된 경계면의 값은 제어부에서 스피커를 통해 사람이 들을 수 있는 신호음으로 나타난다. 두 번째는 온도 검출부분이다. 기름이나, 가스는 온도에 따라 부피가 변하게 된다. 이러한 온도를 측정함으로써 실제 부피를 정확하게 계산할 수 있다. 마지막으로 전체를 제어하는 제어부분이다. 위에서 언급한 것처럼 제어부는 PIC16F84를 사용하여 유수면 경계검출부분과 온도 검출부분을 통합적으로 제어한다. 설계된 모듈들의 결과를 보면 우선 유수 경계면 검출을 오차 $\pm$2mm 내에서 거리 측정이 이루어지며, 온도 검출은 0.2$^{\circ}C$의 정확도를 가지는 성능을 보였다.