• Journal of Biomedical Engineering Research
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• v.27 no.2
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• pp.73-77
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• 2006

Prolonged immobilization leads to significant weakness and atrophy of the skeletal muscle and can also impair the recovery of muscle strength following injury. Therefore, it is important to minimize the period under immobilization and accelerate the return to normal activity. This study examined the effects of combined heat treatment and rest-inserted exercise on the muscle activity of the lower limb during knee flexion/extension. Twelve healthy subjects were assigned to 4 groups that included: (1) heat treatment + rest-inserted exercise; (2) heat treatment + continuous exercise; (3) no heat treatment + rest-inserted exercise; and (4) no heat treatment + continuous exercise. Heat treatment was applied for 15 mins prior to exercise. Continuous exercise groups performed knee flexion/extension at 0.5 Hz for 300 cycles without rest whereas rest-inserted exercise groups performed the same exercise but with 2 mins rest inserted every 60 cycles of continuous exercise. Changes in the rectus femoris and hamstring muscle activities were assessed at 0 and 2 weeks of treatment by measuring the electromyography signals of isokinetic maximum voluntary contraction. Significant increases in both the rectus femoris and hamstring muscles were observed after only 2 weeks of treatment when both heat treatment and rest-inserted exercise were performed. These results suggest that combination of various treatment techniques, such as heat treatment and rest-inserted exercise, may accelerate the recovery of muscle strength following injury or immobilization.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1592-1593
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• 2011

전 세계적으로 전력사용량의 증가와 전력기술이 발전함에 따라 절연소재 또한 급속한 발전을 가져왔다. 특히 폴리머 애자는 경량성, 내오염성, 시공의 용이성 등과 같은 장점으로 오랫동안 사용해온 자기 애자를 대체하여 사용되고 있다. 최근 고효율 장거리 전력 송전이 가능한 HVDC 송전선로가 증가함에 따라 직류 절연물에 대한 연구가 활발히 이루어지고 있다. 본 연구에서는 두 종류의 실리콘 베이스와 첨가제 함량을 변화시킨 폴리머 시편의 직류 파괴전압 실험과 교류 파괴전압 실험을 실시하였다. 취득한 데이터를 Weibull 분포를 통해 분석 한 결과 직류 파괴전압이 교류 파괴전압에 비해 2~5배 높은 것으로 나타났다.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.1548-1549
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• 2011

High voltage cryogenic insulation issues need to be addressed in order to promote the commercialization of high temperature superconducting (HTS) equipment. As a fundamental step in the development of the optimum bushings for HTS devices, the breakdown characteristics of liquid nitrogen mixed with liquefied insulating gases such as $N_2$, $SF_6$, and $CF_4$ have been investigated. In order to investigate the possibility of substituting $CF_4$ gas for $SF_6$ gas for the bushings of HTS electrical equipment, AC withstanding voltage tests have been performed. In this paper, finding the maximum electric field $E_{max}$ using utilization factor ${\eta}$. This result is applicable to developing the real scale HTS equipment of the design parameters.

• International Journal of Industrial Entomology and Biomaterials
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• v.17 no.2
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• pp.217-221
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• 2008

Dung beetle larvae at the $3^{rd}$ instar were injected with lipopolysaccaride and inducible proteins were examined within a pI level of 3-10 and a size level by proteomics, including 1-D SDS PAGE analysis and antibacterial assay. The immune infected larvae extracts provided seven protein bands in one-dimensional electrophoresis and its antibacterial activity also checked. Hemolymph protein from immune infected larvae of the dung beetle were separated by twodimensional gel electrophoresis and compared with those from native larvae. In 2-D gel electrophoresis, we detected 63 immune infected unique and 32 up-regulated proteins, and 36 proteins that were down-regulated or not present in treated gel. Ten protein spots from unique proteins and those presented as different level of abundance in infected and native larvae were specially expressed. These differentially expressed proteins were proposed to be involved in the defense mechanism against microorganism.

• International Journal of Industrial Entomology and Biomaterials
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• v.17 no.2
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• pp.223-228
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• 2008

A novel beetle antimicrobial protein from stimulated Copris tripartitus and the corresponding gene were isolated in parallel through differential display-PCR and expression in Escherichia coli. To find cDNA clones responsible for bacteria resistance, the suppression subtractive hybridization and GeneFishing differentially expressed genes system were employed in the dung beetle, Copris tripartitus immunized with lipopolysaccaride. One cDNA clone from eight subtracted clones was selected through dot blot analysis and confirmed by northern blot analysis. The 516-bp, selected cDNA clone was determined by 5' and 3' rapid amplication of cDNA ends and cloned into the GST fusion expression vector pGEX-4T-1 for expression of the protein. The expressed protein was predicted 14.7 kDa and inhibited the growth of gram-negative bacteria such as Escherichia coli and Pseudomonas aeruginosa. These results implied that the expressed protein is related to immune defense mechanism against microorganism.

• Korean Journal of Plant Tissue Culture
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• v.21 no.1
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• pp.59-63
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• 1994

Chromosome variation in callus cells initiated from different cytogenetic type plane of Scilla scilloides Complex was analysed Considerable variation in both chromosome number and struchure was found in type AA, while no autosomal variation was detected in type BB callus cells. In allotetraploid AABB, two hypoploid cells were fount while a hypoploid cell and three hyperploid cells were found in eutetraploid cells of BBBB. Autosomes in callus cells derived from the plant with B-chromosomes were more stable than those from the plant without B-chromosome. We doubt that B-chromosomes have a selective function for the autosomes in culture of S. scilloides Complex.

• Journal of Chest Surgery
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• v.48 no.4
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• pp.277-280
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• 2015

We report the case of a 37-year-old man who suffered from biventricular failure due to left isomerism, inferior vena cava interruption with azygos vein continuation, bilateral superior vena cava, double outlet of right ventricle, complete atrioventricular septal defect, pulmonary stenosis, and isolated dextrocardia. Heart transplantation in patients with systemic venous anomalies often requires the correction and reconstruction of the upper & lower venous drainage. We present a case of heart transplantation in a patient with left isomerism, highlighting technical modifications to the procedure, including the unifocalization of the caval veins and reconstruction with patch augmentation.

• Proceedings of the KIEE Conference
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• 2015.07a
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• pp.1185-1186
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• 2015

본 논문에서 HVDC $SF_6$ 가스절연시스템(GIS)에서 최적의 에폭시 재질을 알아내기 위해 $Al_2O_3$와 $SiO_2$ 나노필러가 첨가된 총 다섯 종류의 에폭시에 대한 도전율을 측정하여 DC 전계분포 해석을 수행하였다. 해석결과 $75^{\circ}$의 접촉각(에폭시 스페이서와 도체가 이루는 각도)가 가장 우수한 전계특성을 나타냈고 $Al_2O_3$ 2 hundred per resin(phr)의 나노필러가 첨가된 에폭시가 가장 우수한 절연매질로써의 특성을 보여주었다. 또한, 삼중점에서 전계집중 완화를 위하여 $Al_2O_3$ 2 phr의 나노필러가 첨가된 에폭시의 데이터를 기반으로 열해석을 고려한 정상상태 및 극성 반전에 대해 DC 전계 해석을 수행하여 최적의 에폭시 스페이서 형상을 도출하였다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2007.10a
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• pp.200-203
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• 2007

Devices of junction barrier schottky(JBS) structure using 4H-SiC substrates with wide energy band gaps was designed and fabricated. As a measurement results, the device of reverse I-V characteristics was shown as more than 1000 V, its design optimum length of p-grid was $3{\mu}m$ space. In this paper, I-V characteristics was modeled by using of device fabricated process conditions parameters and it was extracted that the I-V property parameters, and it was compared and analyzed with between device parameters and model parameters.

• Korean Journal of Fisheries and Aquatic Sciences
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• v.37 no.3
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• pp.197-201
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• 2004

Juveniles of parrot fish (Oplegnathus fasciatus) were graded and divided into three groups (mean initial size): Small group $(32.9\pm3.2\;g),$ Large group $(130.1\pm12.3\;g)$ and Ungraded group $(74.8\pm29.8\;g).$ Growth and sex ratio were monitored over 3 years. It was concluded that no production advantage was gained by weight grading. There were no differences when the pooled data from the two graded groups were compared with the ungraded group, although mean weight and survival of the large group were continuously higher than those of other groups until the end of rearing period. The highest percentage of males was found in the large group. These results show that males start growing faster than females long before the size grading.