• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2006.06a
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• pp.315-316
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• 2006

Dense $0.95(Na_{0.5}K_{0.5})NbO_3-0.05LiTaO_3$ (NKN-LT) ceramics were developed by conventional sintering process. Sintering temperature was lowered by adding $Na_2O$ as a sintering aid. The electrical properties of NKN-LT ceramics were investigated as a function of $Na_2O$ concentration. When the sample sintered at $1000^{\circ}C$ for 4h with the addition of 1 mol% $Na_2O$, electromechanical coupling factor ($k_p$) and piezoelectric coefficient ($d_{33}$) of NKN-LT ceramics were found to reach the highest values of 0.43 and 190 pC/N, respectively.

• The Journal of Korean Physical Therapy
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• v.23 no.1
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• pp.45-51
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• 2011

Purpose: This study investigated the effect of needle electrode stimulation at various frequencies on change in wound healing in excision wound rats Methods: Twenty-four Sprague-Dawley adult male rats were assigned to one of four groups: control (n=6), acupuncture group (n=6), low rate (2 Hz) percutaneous electrical stimulation group, high rate (100 Hz) percutaneous electrical stimulation group (n=6). We analyzed morphological effects by measuring the area of the excision wound, the contraction rate, and chromatic red. A digital camera and an image analysis program were used to measure and analyze the wound area,which was also used for the contraction rate. Chromatic red was obtained by calculating red, green, and blue (RGB) values of the wound area. Results: The electro acupuncture stimulation groupsshowed significant healing effects compared to the control and acupuncture groups. Conclusion: The results of this study showed that various frequencies of percutaneous electrical stimulation have a therapeutic effect on wound healing.

• Journal of Veterinary Clinics
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• v.20 no.4
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• pp.467-473
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• 2003

The pelvic radiographs of 47 clinically normal Jindoes (26 dogs and 21 bitches) were investigated to evaluate the coxofemoral joints, prospectively. The hip joints were graded according to the Orthopedic Foundation for Animals criteria of excellent, good, fair, borderline, mild canine hip dysplasia (CHD), moderate CHD, severe CHD. Of the 47 Jindoes evaluated, 8 (17%) were graded as dysplastic, 3 (6.4%) were mildly dysplastic, 3 (6.4%) were moderately dysplastic, and 2 (4.3%) were severly dysplastic. Of the 39 Jindoes graded as normal, 16 (34%) were classified as having excellent hip joint phenotype, 15 (31.9%) were classified as having fair, and 8 (17%) were classified as good. Each hip joint was scored based on the British Veterinary Association/The Kennel Club hip scoring system. The normal hip joint (excellent, fair, good) received score less than 5, while dysplastic hip joint (mild, moderate, severe CHD) received score form 5 to 29. Norberg angle (r=0.76) and femoral angle of inclination (r=0.6) were in inverse proportion to grade of the hip joint (P<0.01). The width of medial joint space was in proportion to grade of hip joint (r=0.7, P<0.01).

• Journal of Korea Multimedia Society
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• v.25 no.5
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• pp.661-669
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• 2022

The purpose of this study is to compare and analyze Deep Learning (DL) and Digital Image Processing (DIP) techniques using the results of the glottis segmentation of the two methods followed by the quantification of the asymmetric degree of the vocal cord mucosa. The data consists of 40 normal and abnormal images. The DL model is based on Deeplab V3 architecture, and the Canny edge detector algorithm and morphological operations are used for the DIP technique. According to the segmentation results, the average accuracy of the DL model and the DIP was 97.5% and 94.7% respectively. The quantification results showed high correlation coefficients for both the DL experiment (r=0.8512, p<0.0001) and the DIP experiment (r=0.7784, p<0.0001). In the conclusion, the DL model showed relatively higher segmentation accuracy than the DIP. In this paper, we propose the clinical applicability of this technique applying the segmentation and asymmetric quantification algorithm to the glottal area in the laryngoscopic images.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.641-643
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• 2022

COVID-19로 인해 대학 수업 운영에도 많은 변화가 생겼고 현재도 다양한 수업 방식이 시도되고 있다. 특히 컴퓨터 프로그래밍과 같이 실습이 중요한 비중을 차지하는 교과목들은 대면수업이 더 효과적일 것이라고 많은 교수자들이 생각하고 있다. 본 연구진 역시 사전에 그런 인식을 가지고 연구를 진행하게 되었다. 그러나 예상했던 것보다 비 대면이나 혼합 방식의 수업을 선호하는 학생들의 비중이 꽤 컸으며 그 이유도 매우 구체적이고 다양하였다. 본 연구에서는 대면, 비대면, 혼합 방식의 수업을 모두 경험한 컴퓨터공학과 전공 수업 참여 학생들을 대상으로 효과적인 프로그래밍 수업 방식에 관한 설문을 실시하고 그 결과를 분석해보았다. 이 연구의 결과는 post COVID 19의 시대를 살아가면서 COVID 19으로 인해 생긴 대학 수업의 변화와 요구들을 수업 운영에 좀 더 긍정적으로 활용하는 기초가 될 것으로 생각한다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2022.07a
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• pp.645-647
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• 2022

코로나 팬더믹으로 인한 비대면 수업은 지속적인 운영을 통해 개선·발전되었다. 2022학년도부터 대면수업으로 전환되면서 온라인 플랫폼에 대한 적응력이 높아지고, 비대면 수업 경험이 축적된 학습자들을 위한 대면 수업의 변화가 필요하게 되었다. 본 논문은 프로그래밍 수업에서 비대면 방식과 대면 방식에 대한 경험이 있는 학습자들의 수업방식에 따른 만족도 및 의견을 조사·분석함으로써 서로 다른 두 방식의 장점을 활용한 수업모델을 모색하는데 필요한 학습자 의견 도출에 그 목적이 있다. 조사 결과, 학습자들은 대면 수업을 선호하나 비대면 학습경험이 많을수록 대면 수업에서의 단점을 비대면 수업을 통해서 해소할 수 있는 부분이 있음을 인지하고, 비대면 방식을 대면 수업에 활용하는 것을 긍정적으로 생각하는 것으로 나타났다. 이를 통해 향후 대면 프로그래밍 수업에서 비대면 방식을 결합한 하이드리드 방식의 수업 운영을 통한 수업 효과 증진 모델이 필요한 것으로 사료된다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2023.01a
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• pp.419-421
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• 2023

팬데믹 이후 많은 업무가 원격으로 전환되었고 4차 산업의 대두로 그 근간이 되는 IT분야의 인력 수요가 해마다 가파르게 증가하면서 IT분야 취업에 청신호가 켜지고 있다. 그러나 질 높은 취업을 위해서는 체계적인 취업 지원 체계를 통해 역량을 갖추어 남다른 취업 경쟁력을 갖추어야 한다. 본 연구는 대학에 체계적인 취업 지원 체계를 갖추기 위한 목적으로, 우선 학생들이 현재 처한 상황과 그에 따른 니즈를 파악해보고자 취업에 대한 학생들의 마인드를 파악할 수 있는 설문을 실시하였고 설문 결과를 학생들의 학업성취도에 따라 분석해보았다. 이 연구 결과는 향후 IT 전공 학생들의 취업 역량을 강화하는, 효과적인 지원 프로그램을 대학에 마련하는데 기초가 될 것으로 기대된다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2024.01a
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• pp.443-444
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• 2024

최근 취업에 청신호가 켜진 IT분야에서 전공자들이 취업을 준비할 때, 선 취업 후 실무 역량을 강화해야 할지 또는 실무 역량을 충분히 갖추고 난후 취업해야 할지는 직무 역량에 따라 차이가 있을 것이다. 그러나 열심히 취업을 준비해온 학생들은 좀 더 자신감을 가지고 적극적으로 취업 지원을 할 필요가 있다. 학생들에게 취업 지도를 하는 교수자로서 자신이 가진 역량에 비해 자신감이 없는 학생들을 보면 안타까울 때가 많다. 본 연구에서는 IT분야 기 취업자들에게 취업 시 필요한 역량에 대한 설문을 실시함으로써, 취업을 준비하는 학생들에게 실제 취업에 성공한 취업자들의 의견을 통해 보다 자신감을 가지고 취업 지원을 하는데 도움이 되고자 한다.

• Korean Journal of Veterinary Research
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• v.37 no.4
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• pp.855-862
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• 1997

Ivermectin is a synthetic derivative of the naturally occurring avermectin $B_{1a}$ (22, 23-dihydroavermectin $B_{1a}$) and $B_{1b}$ (22, 23-dihydroavermectin $B_{1b}$), It is widely used as antiparasitic and pesticidal agents because of its remarkably potent and broad spectrum of antiparasitic activity. Although the drug has shown excellent anthelmintic effects, development of toxicosis in some animals such as the Collie species of dog is well documented. However, no studies have been reported on the toxic effects of the drug in Korean native animals such as the Jindo dog. The toxic effect of ivermectin was evaluated in 25 Jindo dogs divided into five groups which were orally administered with ivermectin at dosage levels of $200{\mu}g/kg$, $300{\mu}g/kg$, $600{\mu}g/kg$ and $2,500{\mu}g/kg$ of body weight, respectively. Toxic signs were not observed in the groups receiving $200{\mu}g/kg$ and $300{\mu}g/kg$ B.W. ivermectin. One dog developed mild clinical signs of toxicosis in the group receiving $600{\mu}g/kg$ dosage of ivermectin. In the group with $2,500{\mu}g/kg$ dosage, all dogs developed mild (salivation, drooling, vomiting, mydriasis, and/or confusion) and/or moderate (ataxia and tremors) clinical signs of toxicosis. Hematologic changes were not observed in the groups receiving $200{\mu}g/kg$, $300{\mu}g/kg$ and $600{\mu}g/kg$ B.W. ivermectin. In the groups receiving $2,500{\mu}g/kg$ B.W., total erythrocyte counts, total and differential leukocyte counts and hemoglobin levels were not affected by drug. Aspartate aminotransferase levels were increased after administration of ivermectin, while serum cholesterol and blood glucose levels were decreased.

• Reproductive and Developmental Biology
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• v.34 no.3
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• pp.253-256
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• 2010

This study was performed to investigate the characteristics within ages and freezing tolerance of spermatozoa in Jindo Dog. Experimental animals were selected 12 herds within 1~8 year's old and collected semen for 2 times in a week. Collected semen was evaluated whole volume and sperm number with CASA system (SIAS, Medical Supply, Korea). Then seminal plasma were separated and diluted with modified Tris-egg yolk extender and added 4, 6 and 8% glycerol for 4 times to final concentration and equilibrated for 1.5 hrs. Before and after freezing, equilibrated semen were evaluated the survival rates. Total volume of sperm at 1~2 year old group is as $5.2{\times}10^8\;cells/ml$ largest and there were no significance among groups. The motility of 1~2 year old group is highest as 90.9% and there were significance among groups. Abnormal sperm showed similar among groups. The survival rate in terms of pre-freezing and post-freezing were decreased all levels of glycerol and reveled 87.0% to 64.5% in 4%, 87.5% to 51.9% in 6% and 73.4% to 29.7% in 8%, there were significant difference among the groups (p<0.05). These results suggest that the optimal sperm-freezing methods in Jindo Dog are utilized with modified Tris egg-yolk extender with 4% glycerol and were improve the reproductive activity by these methods.