• Journal of the Korean Magnetics Society
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• v.21 no.3
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• pp.93-98
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• 2011

We successfully grew $La_{0.35}Pr_{0.35}Ca_{0.3}MnO_3$(LPCMO)/$LaAlO_3$(LAO) thin film using Laser Molecular-Beam Epitaxy and studied post-growth annealing effects ($750^{\circ}C$, 5 h) on its crystal structural and magnetic properties. Whereas the single-layered LPCMO and LPCMO/STO superlattice thin films show rough surface before and after the post-growth annealing, LPCMO/LAO superlattice shows a relatively very flat surface even after the post-growth annealing. The enhancement of ferromagnetism of LPCMO/LAO superlattice after the post-growth annealing was remarkable compared to the single-layered LPCMO thin film. The coercive and saturation magnetic field of the single-layed LPCMO thin film were decreased after the post-annealing. However, for LPCMO/LAO superlattice, a same coercive and increased saturation magnetic field were exhibited after post-growth annealing. We suggest that these peculiar observations are originate from the super-structure of LPCMO and LAO.

• Journal of Aquaculture
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• v.13 no.4
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• pp.331-338
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• 2000

To establish an alternate technology for all male seed production of Nile tilapia, Oreochromis niloticus at hatchery scale, the performance of progenies produced by crossing superfemale with sex reversed male was evaluated. Free crossings between 21 superfemales and 7 sex reversed males stocked in an aquarium for 60 days resulted in the production of 93.5 % male progenies, compared to 53.2 % males produced by an equal number of normal females and normal males. Spawning frequency was lower (19 times) in the experimental cross including superfemales than that (24 times) in the control including normal females. Seed production in the experimental aquarium was (3,085) significantly lower than that (3,797) of the control. Both in terms of seeds per female per day or seeds per g female per day, seed productivity did not significantly differ between these groups. The alternate technology involving crossing between superfemale and sex reversed male has proven to be an efficient alternate technology for mass production of all male seeds at the hatchery scale.

• Korean Journal of Plant Taxonomy
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• v.44 no.1
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• pp.33-38
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• 2014

Three unrecorded species, Carex chungii Z. P. Wang, C. tsushimensis (Ohwi) Ohwi, C. multifolia Ohwi were found in Korea. C. chungii Z. P. Wang was found in Is. Wan and Is. Geogeum, Jeollanam-do and Namhae, Gyeongsangnam-do. This species is distinguished from C. leuchoclora Bunge by achenes constricted above in the middle. C. tsushimensis (Ohwi) Ohwi was found in Is. Gageo, Sinan, Jeollanam-do. This species is distinguished from C. conica Boott by pistillate scales with a long arista. C. multifolia Ohwi was found in Haenam, Jeollanam-do. This species is distinguished from C. sachalinensis var. sikokiana (Franch. & Sav.) Ohwi by caespitose and leaf of light gray. We provide here their description, illustration, photographs and the key of related species.

• Journal of the Korean Vacuum Society
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• v.22 no.2
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• pp.92-97
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• 2013

The luminescence properties of InAs/GaAs quantum dots (QDs) grown by a migration enhanced epitaxy method have been investigated by using photoluminescence (PL) and time-resolved PL measurements. The MEE method supplies materials in a series of alternate depositions with migration enhancing time between each deposition. After In source was supplied for 9.3 s, the growth was interrupted for 5 s. Subsequently, As source was open for 3 (AT3), 4(AT4), 6 (AT6), or 9 s (AT9), and the growth was interrupted for 5 s again. This growth sequence was repeated 3 times for the growth of InAs QDs. The PL peak of the AT3 was 1,140 nm and the PL intensity was very weak compared with that of the other three samples. The PL peak of all samples except the AT3 sample was 1,118 nm, which is blueshifted from 1,140 nm, and the PL intensity was increased compared to that of the AT3. These results can be explained by the increased QD density and the improved QD uniformity. The AT6 sample showed the strongest PL intensity and the narrowest full width at half maximum. The PL decay time of AT6 increased with increasing emission wavelength from 940 to 1,126 nm, reaching a maximum decay time of 1.09 ns at 1,126 nm, and then decreased as the emission wavelength was increased further.

• Proceedings of the Korea Water Resources Association Conference
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• 2007.05a
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• pp.121-125
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• 2007

물 수요예측을 실시함에 있어서 사회 경제의 장래동향과 도시의 특성 및 발전 동향을 반영하여 수행하여야 한다. 그러나 지금까지의 관행으로는 수도계획에서 사용할 수 있는 실사용량에 대한 조사와 통계가 이루어지지 않고 있다. 실제 현장에서 얻은 자료를 토대로 하여 수도계획 및 설계에 사용할 수 있는 신뢰성 있는 설계인자의 도출이 필요하다. 본 연구에서는 급수지역의 각 조사 가정의 물 사용량을 실측 조사하여 얻어진 자료를 토대로 하여 물 수요 구조의 변화를 파악할 수 있는 수단의 하나로 가정의 수돗물 사용특성과 경제적 요인에 따른 가정용수의 사용특성 경향을 파악하고자 하였다. 가정에서 사용된 용수량의 조건별 경향성을 분석하기 위하여 한국수자원공사에서 2002년부터 2006년까지 3년여에 걸쳐 표본 집단이 되는 전국 140개 가구에 유량계를 설치하여 유량 자료를 획득하였고, 설문조사를 실시하여 각 가정의 물 사용 특성인자들을 조사하였다. 이 자료를 대상으로 비교적 자료의 신뢰성을 높이기 위한 자료의 선별과정을 거쳤다. 이렇게 선별된 자료들을 경향성 분석에 쓰이는 Mann-Kendall test와 Spearman's Rho test를 이용하여 분석하였다. 그 결과를 바탕으로 가정 용수 소비패턴의 증가 감소에 영향을 끼치는 인자들을 추출하였다. 실측자료를 분석을 통하여 나타난 결과들을 바탕으로 용수 수요처의 조건별 특성을 분석하고, 이를 활용한 생활용수 예측모형을 개발함으로써 합리적인 수요예측에 의한 용수수요의 과다예측 우려를 해소하고, 경제적 수도시설계획을 수립하는 등 과학적 물 수요관리 정책 수립을 위한 의사결정도구가 제공될 수 있다.c}$C의 저온에서 저장한 감자는 $20^{\circ}$C에서 저장한 감자보다 발아의 지연과 함께 낮은 PGA증가율을 보였다.다 높았으며, 전반적인 선호도의 경우 G3(1.5%)를 가장 선호하는 것으로 나타났다. 백년초 분말 첨가 도토리묵의 경우 색상은 0.5% 첨가한 O1이 가장 높은 값을 나타냈으며, 외관은 1.5% 첨가한 O3가 가장 높은 값을 보였다. 향미와 신맛의 경우는 백년초 분말의 첨가량이 증가됨에 따라서 유의적으로 증가했다(p<0.001). 씹힘성, 탄력성, 견고성의 경우는 대조군이 가장 높았으며, 백년초 분말 첨가량이 증가함에 따라 유의적으로 낮아졌다(p<0.001), 떫은맛의 경우는 백년초 분말에 의한 신맛의 영향으로 1% 백년초 분말이 첨가된 O2 가장 높게 나타났다. 전반적인 선호도는 0.5% 백년초 분말이 첨가된 O1이 가장 높게 나타났다. 따라서 녹차와 백년초의 기능성을 살린 도토리묵을 실용화시키는 효과적인 배합비는 녹차 분말 1.5% 첨가와 백년초 분말 첨가 0.5%가 바람직한 것으로 보이며 백년초 분말은 1%까지도 가능한 것으로 나타났다. 그러므로 기능성 식품 소재로써 도토리묵에 녹차와 백년초 분말을 첨가하는 것은 충분히 활용할만한 가치가 있다고 사료된다.론적으로, 비육돈 사료 내 3.32%의 호맥 사일리지의 혼합급여는 혈액 내 코티졸 함량, 도체육의 명도와 황색도, 지방산 조성 및 영양소 소화율에 영향을 미치는 것으로 사료되나 이에 대한 보다 많은 연구가 필요할 것으로 판단된다.니티와 공원과의 관계로 공원 설계와 관리에 있어서 영국에서는 커뮤니티가 직접 고객(client)으로서 역

• Journal of Life Science
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• v.22 no.12
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• pp.1680-1687
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• 2012

Postmenopausal women are at an increased risk of developing coronary artery disease, primarily due to dyslipidemia that accompanies the loss of estrogen secretion. This study was performed to investigate the effects of Opuntia humifusa seed extracts on blood flow and serum lipid level in ovariectomized rats. Twenty-eight 9-week old female Sprague-Dawley rats were randomly assigned to four groups as sham-operated rats (SHAM), ovariectomized rats (OVX-CON), and ovariectomized rats that were treated with Opuntia humifusa seed extracts (OVX-OHS 2% and OVX-OHS 6%). The diets were fed to the rats for 7 weeks after operation. Serum total cholesterol and triglyceride contents decreased in the SHAM group compared to the OVX-CON group. Seven weeks of feeding of Opuntia humifusa seed extracts resulted in significant (p<0.05) lowering of serum triglyceride and a decreasing tendency in total cholesterol levels. The level of HDL-cholesterol in serum increased significantly by feeding diets containing the 2% and 6% Opuntia humifusa seed hot-water extract (p<0.05). Blood passage times were shorter in the Opuntia humifusa seed extract-supplemented groups than in the untreated group (OVX-CON). The platelet aggregation ability was lower in groups treated with Opuntia humifusa seed extracts than in the OVX-CON group. These results suggest that Opuntia humifusa seed extracts may have benefits in improving metabolic syndrome in menopausal women.

• The Journal of the Convergence on Culture Technology
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• v.8 no.5
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• pp.535-539
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• 2022

This study analyzed the efficient hose loading method for indoor fire hydrants, and the experimental results are as follows. An effective fire hose loading method is to be derived through an experiment comparing the fire hose loading method of an indoor fire hydrant and the speed of fire suppression. When the fire hose was loaded by folding, it took an average of 33 seconds to load the fire hose, and for the hangyeopsal, it took an average of 69 seconds to load the fire hose, showing a significant difference. First, in the folding hose deployment experiment, subjects A, C, D, and E showed similar values from 34 seconds to 37 seconds, respectively. The reason seems to be the result of the fact that the fire hose was not twisted when unfolding, and that it was possible to deploy the hose smoothly. Subject B showed the lowest deployment time at 25 seconds, which seems to be the result of B's experience in deploying the fire hose. Second, in the hose unfolding experiment, subjects A, B, C, and E had a similar time period of 44 to 76 seconds, respectively. However, the test subject D was significantly higher at 110 seconds. The reason is that the attempt to prevent hose kinking when deploying the fire hose and the unstable psychological state through tension are judged to increase the fire hose deployment time.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2022.10a
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• pp.360-363
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• 2022

According to the 2018 Kaggle ML & DS Survey, among the proportions of frameworks for machine learning and data science, TensorFlow and Keras each account for 41.82%. It was found to be 34.09%, and in the case of development programming, it is confirmed that about 82% use Python. A significant number of machine learning and deep learning structures utilize the Keras framework and Python, but in the case of Python, distribution and execution are limited to the Python script environment due to the script language, so it is judged that it is difficult to operate in various environments. This paper implemented a machine learning and deep learning system using C# and Keras running in Visual Studio 2019. Using the Mnist dataset, 100 tests were performed in Python 3.8,2 and C# .NET 5.0 environments, and the minimum time for Python was 1.86 seconds, the maximum time was 2.38 seconds, and the average time was 1.98 seconds. Time 1.78 seconds, maximum time 2.11 seconds, average time 1.85 seconds, total time 37.02 seconds. As a result of the experiment, the performance of C# improved by about 6% compared to Python, and it is expected that the utilization will be high because executable files can be extracted.

• Reproductive and Developmental Biology
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• v.31 no.1
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• pp.29-33
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• 2007

This study was conducted to examine the development of in vitro fertilized (IVF) and nuclear transfer (NT) embryos following vitrification IVF and NT embryos developed to the blastocyst stage were equilibrated by 3 steps, vitrified and thawed, and their survival and hatching rates were examined. In IVF embryos, higher survival (82.1%, 96/117) and hatching rates (64.1%, 75/117) were obtained respectively after thawing and culture in expanded blastocysts compared to blastocysts (p<0.05). High survival and hatching rates were also obtained by vitrification of NT blastocysts, especially in expanded and hatching blastocysts (81.1 and 78.3%, respectively). The result of this study shows that IVF and NT blastocysts, especially late stage blastocysts, are successfully cryopreserved by vitrification.

• Proceedings of the Optical Society of Korea Conference
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• 2007.07a
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• pp.243-244
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• 2007

본 연구에서는 성형용 코어 가공에서 초경합금(WC, Co 0.5%)의 초정밀 가공특성을 파악하기 위하여 다이아몬드 휠의 메시, 주축 회전속도, 터빈 회전속도, 이송속도 및 연삭깊이에 따른 표면거칠기를 측정하여 최적연삭조건을 규명하였다. 규명된 최적연삭가공조건을 활용하여 페러렐 연삭법으로 초정밀 연삭가공을 수행하였다. 연삭가공은 초정밀가공기(ASP01, Nachi-Fujikoshi Co., Japan)를 사용하였다. 최종 정삭가공을 수행한 비구면 성형용 코어의 형상측정결과 형상정도(PV; ${\varphi}$ 3.0mm) 0.15${\mu}m$(비구면), 0.10${\mu}m$(평면)으로 3M급 이상의 고화질 카메라폰에 채용되고 있는 비구면 Glass렌즈 양산용 성형용 코어 규격에 만족한 결과로서 본 연구에 수행된 초정밀 가공조건 및 측정방법이 매우 유효함을 알 수 있었다. 형상정도(PV) 및 표면조도(Ra) 측정은 초정밀 자유곡면 측정기(UA3P, Panasonic Co., Japan)와 3차원 표면조도 측정기(NewView5000, Zygo Co., USA)를 각각 사용하였다. 초정밀 가공된 성형용 코어면에 이온증착법을 활용하여 DLC 코팅을 수행하였다. 코팅 전후의 성형용코어를 활용하여 Glass소재(K-BK7, Sumita Co., Japan)를 최적의 성형조건(성형온도, 압력, 냉각속도)으로 성형하였다. DLC 코팅과 성형은 DLC 코팅기(NC400, Nanotech Co., Japan)와 Glass렌즈 성형기(Nano Press-S, Sumitomo Co., Japan)을 각각 사용하였다. Fig. 1은 초정밀 연삭가공, DLC 코팅막 구조, 코팅된 성형용 코어, 그리고, 성형된 비구면Glass렌즈를 각각 나타낸다.