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±8.31 and 13.25±7.86. The mean numbers of transferable embryos, sexed semen were significantly lower than KPN semen (3.75±1.98 vs. 8.23±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.

This study was conducted for SNPs in the 5'-regions of estrogen receptor-α(ESR-α), and association with calving interval (CI), service per conception (SPC) and 305 days milk yield in Hanwoo and Holstein dairy cattle. The genet-ic improvement was incurred low reproduction performance. The objective of this study was to investigate connec-tions between single nucleotide polymorphisms (SNP) of Estrogen receptor-α (ESR-α) 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 ge-notype the cattle. The result showed two variants of the ESR-α gene. The Bgl I cut the 492 bp amplification pro- duct into 322 bp and 170 bp fragments for allele G, while allele A remained uncut, resulting in two restriction frag-ments for homozygote G/G and three fragments for heterozygote A/G. We found two of different genotypes in the-se 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±10.03 days, and G/G was 381.69±5.22 days. The SPC of A/G was 1.62±0.16, and G/G was 1.32±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±936.00 kg and of G/G was 8,747.51±204.88 kg, showing no significant difference.

Solar cells exhibit different power outputs in different climates. In this study, the temperature dependence of open-circuit voltage(V-oc), short-circuit current(I-sc), fill factor(FF) and the efficiency of screen-printed single-crystal silicon solar cells were studied. One group was fabricated with homogeneously-doped emitters and another group was fabricated with selectively-doped emitters. While varying the temperature (25, 40, 60 and 80˚C), the current-voltage characteristics of the cells were measured and the leakage currents extracted from the current-voltage curve. As the temperature increased, both the homogeneously-doped and selectively-doped emitters showed a slight increase in I-sc and a rapid degradation of V-oc. The FF and efficiency also decreased as temperature increased in both groups. The temperature coefficient for each factor was calculated. From the current-voltage curve, we found that the main cause of V-oc degradation was an increase in the intrinsic carrier concentration. The temperature coefficients of the two groups were compared, leading to the idea that structural effects could also affect the temperature dependence of current-voltage characteristics.

This research presents the nonlinear analysis model for reinforced concrete shear wall systems with special boundary elements as proposed by the Korean Building Code (KBC, 2009). In order to verify the analysis model, analytical results were compared with the experimental results obtained from previous studies. Established analytical model was used to perform nonlinear static and dynamic analyses. Analytical results showed that the semi-special shear wall improved significantly the performance in terms of ductility and energy dissipation as expected based on previous test results. Furthermore, nonlinear incremental dynamic analysis was performed using 20 ground motions. Based on computer analytical results, the ordinary shear wall, special shear wall and newly proposed semi-special shear wall systems were evaluated based on the methods in FEMA P965. The results based on the probabilistic approaches accounting for inherent uncertainties showed that the semi-special shear wall systems provide a high capacity/demand (ACMR) ratio owing to their details, which provide enough capacity to sustain large inelastic deformations.

This research verified the usefulness and practicality of citrus peel extract as a natural dye. This study dyed cotton, silk, and cotton/mulberry fiber blended fabrics using citrus peel extract, and measured the dyeability and functional property to verify their usefulness and practicality. The dyeing affinity of the citrus peel extract was measured by dyeing under alkaline conditions to determine the temperature and time for optimal dyeing conditions of the solution. The results show that a temperature and time of 60℃ and 30 minutes were optimal for dyeing cotton fabrics with citrus peel extract, 50℃ and 60 minutes for silk fabrics, and 60℃ and 60 minutes for cotton/mulberry fiber blended fabrics, respectively. In addition the results of measuring the color fastness of the cotton, silk, and cotton/mulberry fiber blended fabrics dyed with the citrus peel extract show that the color fastness was superior for washing, friction, sweat, and water. However, the color fastness for sunlight appeared to be slightly weak. In addition, it was found that fabric dyed with the citrus peel extract showed partial antimicrobial properties. The antimicrobial property appeared the greatest in the silk fabric. The cotton/mulberry fiber blended fabrics had 90% or more Staphylococcus aureus present, but the antimicrobial properties were not high in the cotton fabric. Additionally, the heavy metal content, which is harmful to the human body, appeared to be lower than standard figures, so the dye was found to be innocuous to humans. Therefore, when the results of this study are put together, citrus peel extract is sufficiently useful and practical as an ingredient for a natural dye. Moreover, there is ample possibility to develop citrus peel dyed fabrics as environmentally friendly fashion materials.

The use of solar energy generation is steadily increasing, and photovoltaic modules are connected in series to generate higher voltage and power. However, solar panels are exposed to high-voltage stress (up to several hundreds of volts) between grounded module frames and the solar cells. Frequent high-voltage stress causes a power-drop in the modules, and this kind of degradation is called potential induced degradation (PID). Due to PID, a significant loss of power and performance has been reported in recent years. Many groups have suggested how to prevent or reduce PID, and have tried to determine the origin and mechanism of PID. Even so, the mechanism of PID is still unclear. This paper is focused on understanding the PID of crystalline-silicon solar cells and modules. A background for PID, as well as overviews of research on factors accelerating PID, mechanisms involving sodium ions, PID test methods, and possible solutions to the problem of PID, are covered in this paper.

When sunlight irradiates a boron-doped p-type solar cell, the formation of BsO2i decreases the power-conversion efficiency in a phenomenon named light-induced degradation (LID). In this study, we used boron-doped p-type Cz-Si solar cells to monitor this degradation process in relation to irradiation wavelength, intensity and duration of the light source, and investigated the reliability of the LID effects, as well. When halogen light irradiated a substrate, the LID rate increased more rapidly than for irradiation with xenon light. For different intensities of halogen light (e.g., 1 SUN and 0.1 SUN), a lower-limit value of LID showed a similar trend in each case; however, the rate reached at the intensity of 0.1 SUN was three times slower than that at 1 SUN. Open-circuit voltage increased with increasing duration of irradiation because the defect-formation rate of LID was slow. Therefore, we suppose that sufficient time is needed to increase LID defects. After a recovery process to restore the initial value, the lower-limit open-circuit voltage exhibited during the re-degradation process showed a trend similar to that in the first degradation process. We suggest that the proportion of the LID in boron-doped p-type Cz-Si solar cells has high correlation with the normalized defect concentrations (NDC) of BsO2i. This can be calculated using the extracted minority-carrier diffusion-length with internal quantum efficiency (IQE) analysis.

감귤류 과피는 플라보노이드의 중요 급원 중의 하나로 아시아에서 민간 의약품으로서 오래전부터 사용되어 왔다. 본 연구에서는 진귤(Citrus sunki Hort. ex Tanaka) 과피에서 HPLC-MS/MS를 이용하여 9종의 플라보노이드 성분을 동정하였으며, hydroxypentamethoxyflavone과 dihydroxytetramethoxyflavone은 진귤에서 처음으로 확인되었다. 총 플라보노이드의 항산화 활성은 25~500 mg/L 의 농도범위에서 DPPH·, ABTS·+, NO· 소거능 및 환원력에 의해 측정되었으며, 시료의 첨가량이 많아짐에 따라 항산화 활성은 유의적으로 증가하였다.

FeS2 has been widely used for cathode materials in thermal battery because of its high stability and currentcapability at high operation temperature. Salts such as a LiCl-KCl were added as a binder for improving electrical per-formance and formability of FeS2 cathode powder. In this study, the effects of the addition of Li2O in LiCl-KCl binderon the formability of FeS2 powder compact were investigated. With the increasing amount of Li2O addition to LiCl-KClbinder salts, the strength of the pressed compacts increased considerably when the powder mixture were pre-heat-treatedabove 350oC. The heat-treatment resulted in promoting the coating coverage of FeS2 particles by the salts as Li2O wasadded. The observed coating as Li2O addition might be attributed to the enhanced wettability of the salt rather than itsreduced melting temperature. The high strength of compacts by the Li2O addition and pre-heat-treatment could improvethe formability of FeS2 raw materials.

This study was conducted to estimate the contents of heavy metals in salted vegetable foods from diverse origin in Korea which were sold in Korea. The levels of heavy metals were determined using an ICP-MS. The values of metals [minimum~maximum (mean), mg/kg] in kimchi were as follows; Pb 0.0~0.074(0.018), Cd 0.0~0.027 (0.004), As 0.0~0.024(0.002), Hg 0~0.002(0.0). The weekly average intakes of lead, cadmium, arsenic and mercury from kimchi take 0.06~0.13% PTWI (Provisional Tolerable Weekly Intakes) that the FAO/WHO Joint Food Additive and Contaminants Committee has set to evaluate their safeties.

췌아세포종은 주로 유년기에 발생하지만, 성인에서도 발생하는 아주 드문 췌장의 종양이다. 성인에서 발생하는 경우예후가 나쁘지만, 조기 진단 및 수술적 절제가 장기 생존율을 향상시킬 수 있다. 영상학적 검사에서는 고형 유두상 상피성 종양, 관샘암종, 세엽세포암 등을 감별진단에 포함시켜 야 한다. 수술적 완전 절제가 원칙이며, 수술후 보조 항암치료 및 항암방사선치료의 경우 아직 연구가 부족한 실정이다. 저자들은 소화불량으로 내원하여 영상학적 검사에서 우연히 발견된 췌장 종괴로 고형 유두상 상피성 종양을 의심 하에 수술을 계획하였고, 수술후 조직학적으로 췌아세포종을 진단하여 보고하고자 한다.

목이버섯(학명 Auricularia auricula judae)은 활엽수의 고사목이나 반고사목에서 생장하고 있는데 중국에서는 목이(木耳), 우리나라에서는 목이 또는 흐르레기, 일본에서는 해파리 또는 기쿠라케(キクラケ), 서구에서는 ear mushroom이라 부르고 있다. 지름은 2～6cm 내외이고 잎맥 모양의 주름살이 있으며, 조직은 한천질로 부드러우나 탄력성이 있어 질기며, 건조하게 되면 딱딱하고 얇아지게 된다. 그리고 특유한 맛과 향이 있고 씹는 촉감이 좋으며 건조, 보관 및 저장성이 우수하다. 또한 영양가가 높은 버섯으로 단백질 11.3%, 칼륨 1,200mg, 인 434mg정도 함유하고 있으며 철 및 칼륨과 각종 비타민 함량이 높다. 특히 섬유소 함량이 높고 교질상 물질이 많아 식도 및 위장을 씻어내는 작용이 있으므로 광부 또는 방직공장 근로자들이 애용하고 혈액을 응고시키는 작용이 있어 출산모와 출혈이 심한 환자에게도 이용할 수 있다고 한다. 이러한 기능성이 널리 알려지면서 여러 나라에서 소비량이 지속적으로 증가하고 있으나 국내에서 유통 중인 400톤(약 60억원, 국내소비량의 95%) 규모의 목이버섯 대부분이 중국에서 건조 상태로 수입되고 있다. 따라서 본 연구는 수입산 목이버섯의 안전성 문제로 생목이 인공재배가 확산되고 있는 가운데 원균의 활력있는 보관관리를 통하여 안전한 균주를 공급과 우량종균의 생산으로 목이버섯의 산업화 기반을 조성하고자 수행하였다. 시험은 전라남도 나주시 산포면 소재에서 2012년～2013년(2년간)까지 육성품종별(4종) 원균 보관 조건별(보존재료, 저장온도 및 기간) 균사활력을 조사하였다. 시험품종은 품작, 풍운, JNM21001(털목이 계통)과 JNM21002(흑목이 계통) 등 4균주이고 원균의 보관요령은 1.8㎖ CORNING 튜브에 보관재료(Distilled water, 10%Glycerol, 5% DMSO)를 1.5㎖씩 넣은 후 패트리디쉬에서 배양중인 균주를 코르크 버러(직경 0.8㎝, 0.5㎠/10㎖)로 찍어 1튜브당 3조각씩 넣고(중심부→외부 등 골고루) 0, 3, 6, 12개월 간격으로 15℃, 4℃, -70℃로 보관(Solid medium 배양은 동일시기에 시험관에 처리) 하였다. 보관균주의 균사활력은 0, 3, 6, 12개월 간격 보관균주를 꺼내어 PDA배지에 접종, 배양한 후 패트리디쉬상에서 균밀도, 생장환 등을 측정한 결과 12개월 15℃ 보관 고체배지는 사멸균주가 많았으나 4℃는 균 활력이 유지되었으며 –70℃도 균주보관이 가능하지만 균 착상에 7～10일 정도 소요되었다. 6개월 보관도 12개월과 비슷하여 15℃ 보관 고체배지는 균 활력이 떨어지거나 사멸(JNM21002)하였으며 4℃, –70℃는 균 활력이 잘 유지되었다. 그러나 3개월 보관의 경우는 보존재료 및 온도조건에 차이 없이 비슷한 활력이었다. 시험균주별로는 품작은 10% Glycerol, 풍운과 JNM21001, JNM21002는 10% Glycerol과 증류수에서 활력이 좋아 원균의 장기보존을 위한 재료는 10%Glycerol과 증류수에서 4℃ 보관이 유망하였다.

본 연구는 1-MCP의 농도별 및 처리시간별 처리가 분화 심비디움 ‘Goldenbell’ 의 품질에 미치는 영향을 알아보고자 수행하였다. 개화율은 모든 처리구에서 100% 정상적으로 개화하였으나 낙화율은 처리 간에 상당한 차이를 나타내었다. 1-MCP 0.168 mg·m-3 처리구는 무처리와 0.021mg·m-3 처리에 비해 현저히 감소된 결과를 나타내었다. 에틸렌 발생량도 1-MCP를 120분간 0.168 mg·m-3 처리 시 무처리 1903.3 mL·h-1·kg-1에 비해 867.6 mL·h-1·kg-1로 현저히 감소되었다. 따라서 이러한 결과는 분화심비디움의 품질선도유지에 매우 효과적임을 알 수 있었다.

Purpose: The purpose of this study was to verify the effect of student-generated rubrics on learning motivation and academic achievement in simulation education. Methods: Student-generated rubrics was developed through the negotiation process between teacher and students, content validity has been verified. The participants were 122 undergraduate nursing students recruited from the one university in G city. The participants were given the simulation education for 15 weeks from 2011 to 2012. Experimental group were presented to student-generated rubrics before course starting was not presented to the control group. The data were analyzed by t-test with SPSS win 18.0 program. Results: Student-generated rubrics presented simulation education was to improve learning motivation and academic achievement. Conclusion: Student-generated rubrics with high reliability and validity in a number of areas to be developed and there is a need to be refined and ensure objectification of simulation education.

다도해상국립공원 지역인 상조도 해안에 해양쓰레기가 다량 표착하고 있다. 이들 해양쓰레기는 해류와 조류 및 바람 등 외부의 영향으로 유입되고 있는데, 이 중 외국기인 해양쓰레기가 상당량 유입되고 있는 것으로 나타나 이들의 기원 특성을 파악하고자 연구를 시작하였다. 선행연구결과 진도 연안으로 유입되고 있는 외국기인 해양쓰레기는 동계와 하계 모두 표착하고 있는 것으로 알려져 있다.

우이산호와 같이 특수 해양시설물인 유류터미널과 선박 간의 해양사고는 대규모 해양오염 발생으로 이어져 해당 기업에 심각한 손실을 끼치며 대형 환경오염을 수반한다. 본 연구는 대상선박을 실시간 모니터링하고 사고위험을 사전에 식별하여 항만시설물을 포함한 단계별 비상 대응이 가능한 유류부두 안전관리 종합정보시스템 개발을 제안한다. 해당 시스템은 선체, 선박운항자 및 유류터미널 시설물까지 유기적으로 통합된 능동적인 안전감시시스템으로 해상교통 모니터링과..