In this research, design and fabrication of marine repeater capable to extend communication coverage in monitoring system of fishing gear automatic identification, which is one of implementation method of the real-name electric fishing gear system declared by Ministry of Oceans and Fisheries in 2016, is reported. The proposed marine repeater is fabricated in a form of RF repeater with interference cancellation system (ICS), which can cancel the oscillation due to feedback signal between service antenna and link antenna. In design process, we secure the isolation of 30 dB between service antenna and link antenna. It is confirmed that when the level of feedback signal into repeater input be lower of 15 dB than repeater gain, error vector magnitude due to oscillation can be lower than the performance criterion of 6%, from the test verification. It is expected that the service coverage will be extended by applying the developed marine ICS RF repeater into marine IoT network including monitoring system of fishing gear automatic identification.
Yeom, Gyu-Tae;Jeon, Hyang-A;Park, Hae-Geum;Kim, Young Sin;Kim, Hyun;Kim, Jae Hwan;Seong, Hwan-Hoo;Cho, Young Moo;Cho, Jae-Hyeon;Ko, Yeoung-Gyu
Reproductive and Developmental Biology
/
v.38
no.3
/
pp.123-127
/
2014
This study was conducted for SNPs in the 5'-regions of estrogen receptor-${\alpha}$ (ESR-${\alpha}$), and association with calving interval (CI), service per conception (SPC) and 305 days milk yield in Hanwoo and Holstein dairy cattle. The genetic improvement was incurred low reproduction performance. The objective of this study was to investigate connections between single nucleotide polymorphisms (SNP) of Estrogen receptor-${\alpha}$ (ESR-${\alpha}$) with reproduction performance (calving interval, service per conception, and 305 d milk yield) in Hanwoo and Holstein dairy cattle. Hanwoo and Holstein blood samples were collected from 183 and 124 dam of breeding farms and DNA was extracted. Primer design was based on NCBI GenBank (Accession No. AY340579). The PCR-RFLP method with Bgl I was used to genotype the cattle. The result showed two variants of the ESR-${\alpha}$ gene. The Bgl I cut the 492 bp amplification product into 322 bp and 170 bp fragments for allele G, while allele A remained uncut, resulting in two restriction fragments for homozygote G/G and three fragments for heterozygote A/G. We found two of different genotypes in these breeds, A/G and G/G. In Hanwoo, the A/G genotype frequency was 0.13, and G/G was 0.87. The CI of A/G was $382.18{\pm}10.03$ days, and G/G was $381.69{\pm}5.22$ days. The SPC of A/G was $1.62{\pm}0.16$, and G/G was $1.32{\pm}0.04$. While CI showed no significance difference, SPC exhibited significant difference (p<0.05). In Holstein cattle, the frequency of genotype A/G was 0.02 and G/G was 0.98. The 305 days milk yield of A/G was $7,253.00{\pm}936.00kg$ and of G/G was $8,747.51{\pm}204.88kg$, showing no significant difference.
Jeon, Hyang-A;Yeom, Gyu-Tae;Park, Hae-Geum;Kim, Sung-Woo;Kim, Hyun;Kim, Young Sin;Seong, Hwan-Hoo;Cho, Young Moo;Cho, Jae-Hyeon;Ko, Yeoung-Gyu
Journal of Embryo Transfer
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v.29
no.3
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pp.283-287
/
2014
Sexed semen is commonly used for the production of calves of the desired gender. Gender selection is important in animal production industries. For example, female cattle are required for the dairy industry while males are preferred in the beef cattle industry. The present study was to assess the in vivo embryo production efficiency using the semen separated according to sex during superovulation in Hanwoo. Seventy Hanwoo donor cows were flushed on day 7 of estrus cycle with same FSH and artificial insemination by the same technicians. Embryos were recovered on 7 days after the third insemination by flushing the uterus with embryo collection medium. KPN semen straws used artificial insemination contained 20 million sperm (total number 60 million per donor). Sex-sorted semen straws contained 4 million sperm (total number 12 million per donor). The results obtained were as follows: No differences were observed in the efficiency of superovulation rates on KPN semen 87%, and sexed semen 100%, respectively. The mean numbers of total embryos are each $12.58{\pm}8.31$ and $13.25{\pm}7.86$. The mean numbers of transferable embryos, sexed semen were significantly lower than KPN semen ($3.75{\pm}1.98$ vs. $8.23{\pm}6.07$, P<0.05). The rates of unfertilized embryos from superovulation using sexed semen were significantly higher than KPN semen (50% vs. 15%, P<0.05). The rate of degenerated 2-cell embryos from sexed and KPN semen was 60.87% and 11.11%, respectively (p<0.05). In conclusion, these results indicate that superovulation using sexed semen was useful, but efficient embryo production was important to reducing the damage caused by the Flowcytometer-based sperm sorting procedure.
Microsatellite markers have been a useful genetic tool in determining diversity, relationships and individual discrimination studies of livestock. The level of genetic diversity, relationships among two Korean indigenous chicken brand populations (Woorimatdag: WR, Hanhyup3: HH) as well as two pure populations (White Leghorn: WL, Rhode Island Red: RIR) were analyzed, based on 26 MS markers. A total of 191 distinct alleles were observed across the four chicken populations, and 47 (24.6%) of these alleles were unique to only one population. The mean $H_{Exp}$ and PIC were estimated as 0.667 and 0.630. Nei's $D_A$ genetic distance and factorial correspondence analysis (FCA) showed that the four populations represented four distinct groups. However, the genetic distance between each Korean indigenous chicken brand (WR, HH) and the pure population (WL, RIR) were threefold that among the WR and HH. For the STRUCTURE analyses, the most appropriate number of clusters for modeling the data was determined to be three. The expected probabilities of identity among genotypes of random individuals (PI) were calculated as $1.17{\times}10^{-49}$ (All 26 markers) and $1.14{\times}10^{-15}$, $7.33{\times}10^{-20}$ (9, 12 with the highest PI value, respectively). The results indicated that the brand chicken breed traceability system employing the own highest PI value 9 to 12 markers, and might be applicable to individual identification of Korean indigenous chicken brand.
This study examined all the research published in Journal of Korean Academy of Nursing (JKAN) for last 30 years, from its beginning year to year 1999, based on an objective frame of evaluation. The purpose of this study is to reflect the trend of nursing research in Korea to date, and to provide an optimal direction for future research. The total number of 959 studies were analyzed with the following results. 1. Since 1990s, the number of non-degree based research has been larger than that of degree-based research compared to 1970s and 1980s. Both collaborative and funded research has been particularly increased in a gradual rate. 2. Research on nurses or nursing students has decreased while research on more diverse populations such as patients, patient families, or community-dwelling healthy clients has increased. 3. While essential nursing concepts such as human, nursing, and health have been consistently dealt as main research topics, research related to the concept of environ- ment has been insufficiently conducted. 4. It was remarkable that the quality of nursing research has been improved due to the acknowledgement of the importance of the empirical research method within the nursing community. 5. Qualitative research has appeared in the journal since the late 1990s, but it is still regarded to be in its novice stage. 6. Although the utilization of research findings for expanding the nursing body of knowledge has been wide in diverse specialties, most studies are limited to focus on concept development or evolution yet. also, in some of these research finding are utilization already considerably as to develop nursing interventions. Based on these findings, conclusions are extended to the following discussions: For the last 30 years, nursing research in Korea has shown an acute methodological development in both quantity and quality. However, there has been a lack of research on theory development although it is one of the ultimate goals in nursing. Further research should be empirical enough to be utilized in an actual nursing care context, and thus to be basis of developing culturally competent nursing theories in Korea.
Kim, Hyun-Ran;Lee, Sin-Ho;Shin, Il-Sheob;Kim, Jeong-Hee;Cho, Kang-Hee;Heo, Seong;Kim, Jeong-Soo;Choi, Yong-Mun
Research in Plant Disease
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v.15
no.3
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pp.170-174
/
2009
In this paper, we report a characterization of Prunus necrotic ringspot virus (PNRSV) isolate. The virus was identified from 'Yumyeong' peach showing mild mosaic on leaves in commercial orchard of 'Umsung', Chungbuk province in Korea. The virus isolate produced ringspot symptom on the inoculated cotyledons and systemic mosaic and malformation on the upper leaves of Cucumis sativus. Systemic mottles were appeared in Chenopodium quinoa. When the buds of the virus infected stem were grafted on the healthy young Prunus persica GF305 seedlings, line pattern with mosaic appeared within 3 months. Isometric virus-like particles were found in parenchyma cells and plasmodesmata of C. sativus leaves inoculated mechanically with the virus. The cDNA fragments of PNRSV coat protein (CP) region, approximately 675bp, were synthesized from genomic RNA extracted from virus-infected leaves by RT-PCR using specific primer pairs. Partial nucleotide sequences of the CP regions were determined and analyzed with the known PNRSV. The CP gene of PNRSVKorea isolates showed 93.9~94.7% similarity to the 4 known PNRSV isolates.
Journal of the Korean Applied Science and Technology
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v.6
no.1
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pp.41-49
/
1989
This study was carried out to study influence of antioxidants on serum and tissue of rats fed with thermally oxidized oil. The experimental animals used 30male rats of sprague-dawley weighting $150{\pm}25g$. They are divided into 5 groups and fed to experimental diets which are composed of 15% thermally oxidized oil in addition to ascorbic acid, Vitamin E, Ethylendintrioteraaceticacid(EDTA) and none added oxidized oil by heat and fresh soybean oil group. Thermally oxidized oil was prepared from the soybean oil by heating at $180^{\circ}C$ for 30 hours. After feeding for 4 weeks, the result are as follows; 1. Body weight gain were lower B diet group than A diet group. 2. Total cholesterol levels in serum of all experimental diet groups except B diet group were higher than that of A diet group. 3. HDL-cholesterol levels of all experimental diet groups except E diet group were lower than that of A diet group. 4. The activities of GOT, GPT in serum of all experimental diet groups except B diet group and D diet group were higher than that of A diet group. 5. Vitamin E levels in serum of E diet group were highest than that of all experimental diet groups, and Vitamin E levels in liver of A diet group were highest than that of all experimental diet groups. 6. Lipid peroxide in Serum were highest B diet group than that of all experimental diet groups and the other experimental diet group significantly lower than that of the A diet group. 7. Lipid peroxide in liver of all experimental diet group except E diet group were significantly higher than that A diet group and lipid peroxide in kidney of all experimental diet group except B diet group were lower than that of A diet group. Four these results, as Vitamin C, Vitamin E, and EDTA added diets have effect of thermally oil by antioxidants, it could be suggested that thermally soybean oil diet has required to add antioxidant because it has not sufficient Vitamin E for antioxidant and intake and overtake level of thermally soybean oil diet should be studied to go ahead.
Der f 2 is the group 2 major allergen of a house dust mite (Dermatophagoides farinae) and its function has been recently suggested. To determine the optimal condition of sensitization to recombinant Der f 2 (rDer f 2) in murine model of asthma, we compared the effectiveness with different adjuvants in BALB/c and C57BL/6 mice. Mice from both strains sensitized with rDer f 2 by intraperitoneal injection or subcutaneous injection on days 1 and 14. The dosage was $20{\mu}g$. Freund's adjuvants with pertussis toxin (FP) or alum alone were used as adjuvants. On days 28, 29, and 30, mice were challenged intranasally with 0.1% rDer f 2. We evaluated airway hyperresponsivenss, eosinophil proportion in lung lavage, airway inflammation, and serum allergen specific antibody responses. Naive mice were used as controls. Airway hyperresponsiveness was increased in C57BL/6 with FP, and BALB/c with alum (PC200: $13.5{\pm}6.3$, $13.2{\pm}6.7$ vs. >50 mg/ml, p<0.05). The eosinophil proportion was increased in all groups; C57BL/6 with FP, BALB/c with FP, C57BL/6 with alum, BALB/c with alum ($24.8{\pm}3.6$, $20.3{\pm}10.3$, $11.0{\pm}6.9$, $5.7{\pm}2.8$, vs. $0.0{\pm}0.0$%, p<0.05). The serum allergen specific IgE levels were increased in C57BL/6 with FP or alum (OD: $0.8{\pm}1.4$, $1.1{\pm}0.8$, vs. $0.0{\pm}0.0$). C57BL/6 mice were better responders to rDer f 2 and as for adjuvants, Freund's adjuvant with pertussis toxin was better.
Kim, Jae-I;Kim, Woo-Seong;Park, Kun-Sang;Kim, Jong-Myoung;Chae, Kab-Ryong;Cho, Dae-Hyun;Kim, Dae-Byung;Kim, Ok-Hee;Sin, Yeong-Min
Journal of Physiology & Pathology in Korean Medicine
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v.21
no.4
/
pp.1039-1044
/
2007
We investigated the residual contents of sulfur dioxide ($SO_2$) on the 280 kinds of herbal medicines distributed at 8 cities including in Seoul, Busan, Daegu, Gwangju, Jecheon, Yeongju, Geumsan and Jeonju in Korea. The residual contents of $SO_2$ were determinated by modified Monier-Williams method. The residual contents of $SO_2$ were not detected at 206 products in total 280 products. However, it was detected below 100 ppm in 39 products, between 101 and 1000 ppm in 30 products and exceeded 1000 ppm in 5 products. $SO_2$ contents ranged 11 ${\sim}$ 2339 mg/kg (mean 293 mg/kg) at domestic samples distributed. Regardless of region, $SO_2$ contents were not found at Notopterygii Rhizoma, Ligustici Scinensis Rhizoma et Radix, Bombyx Batryticatus, Coicis Semen, Cnidii Rhizoma, Anemarrhenae Rhizoma, Gardeniae Fructus, Alismatis Rhizoma. But it's found at Batatatis Rhizoma, Paeoniae Radix and Codonopsitis Radix of every region collected the samples. $SO_2$ contents were not detected at 58 products which collected cultural fields of dometic. After treated with water wash and hot water extraction, the reduction rates of sulfur dioxide were appeared with 14.3% ${\sim}$ 40.4% and 55.2% ${\sim}$ 100.0%, respectively. These data will be used to establish a criteron of residual sulfur dioxide in herbal medicines.
Lee, Tae Hee;Kim, Seong-Eun;Park, Kyung Sik;Shin, Jeong Eun;Park, Seon-Young;Ryu, Han Seung;Kim, Jung-Wook;Lee, Yoo Jin;Cho, Young Sin;Park, Suyeon;Constipation Research Group of The Korean Society of Neurogastroenterology and Motility
The Korean Journal of Gastroenterology
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v.72
no.6
/
pp.295-303
/
2018
Background/Aims: The primary aims of this study were to evaluate the content quality of YouTube videos on exercises to help relieve constipation and to assess whether the video source, exercise types, and popularity affected their quality. Methods: Eight gastroenterologists independently evaluated the exercises presented in the constipation YouTube videos for seven items: image quality, usefulness in relieving constipation (quality 1), usefulness for general physical health (quality 2), difficulty in following, activity intensity, fun, and overall quality. Raters were asked open-ended questions to evaluate the strengths and weaknesses of the videos. Five-point ordinal scales were used to score each item aforementioned, with the exception of image quality and overall quality that used a six-point Likert scale. Results: The 20 videos had a mean length of 268 seconds and a mean viewership of 32,694. The most common video source was commercial (n=10), and the most common type of physical activity was yoga (n=11). The median values of image quality, quality 1, quality 2, difficulty in following, activity intensity, fun, and overall quality were 3, 2, 2, 2, 2, 2, and 2, respectively. Yoga videos had significantly higher median quality 1 values (3) compared with massage videos (2, adjusted p=0.006) and 'others' videos (2, adjusted p<0.001). A lack of medical evidence was the most common answer to open-ended questions about the weaknesses of each video. Conclusions: Overall, YouTube exercise videos presented a low-quality content. This study highlights the need for evidence-based comprehensive educational videos addressing exercises for treating constipation.
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