• Journal of Animal Environmental Science
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• v.18 no.sup
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• pp.55-64
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• 2012

We investigated the effect of the clay mineral fortified with complex trace elements by specific fermentation microbes on growth performance and a quality of pork in this study. For the declared experimental animal, 80 heads of crossbred with Large White and Yorkshire were randomly splitted into a control group and a test group. Each group were assigned with 4 replicates and 10 heads of each replicate. When 0.3% of the fermentation product of the clay mineral (FCM) was added into feed stuff and fed for 9 weeks of experimental feeding period, the results of the feed intake, weight gains, pH of carcass, lightness of meat color, and brightness of the muscle semimembranosus were similar to those of the control group. However, dressing percentage, reddishness of carcass, and water holding capacity were improved, respectively, as much as 2.7%, 12%, and 10%, and reduced by 6% in cooking loss. In order to investigate the immune modulatory effect of fermented clay mineral, pheripheral blood mononuclear cells (PBMC) were isolated and Immune modulatory parameters were measured. The proliferation activity of PBMC from pigs fed the fermented clay mineral were significantly increased compared to control group pigs, and also those results were more clearly observed as activated with lipopolysaccharide and concanavaline A. The secretion of TNF-${\alpha}$ of the FCM group pigs showed an increasing tendency. Therefore it was suggested that the feeding of FCM which was high in cation metathesis and the value of infrared ray, activated the immune responses, and thus the production of the environment-friendly high quality pork without the use of antibiotics would be possible.

• Journal of The Korean Society of Grassland and Forage Science
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• v.34 no.1
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• pp.45-51
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• 2014

This study was conducted to investigate the feeding effects of total mixed fermentations (TMF) with spent mushroom (Flammuliua velutipes) and wet brewer's grain on estimating the productivity and nutrient utilization of Korean black goats. Four experimental groups were set up with each of the 5 animals for a 30-day feeding trial on growth performance. 12 black goats with regard to nutrient digestibility were allocated to 4 groups of 3 animals each by a latin-square design control group (offered concentrate and rice straw) and 3 treatment groups (TMF with 15% spent mushroom and 25% wet brewer's grain (T1), 10, 30% (T2) and 5, 35% (T3)). The average daily gain (ADG) of the control and T1 treatment groups was higher than that of the T3 treatment group (p<0.05). Dry matter (DM) and organic matter (OM) intake (kg/head) for T1 and T2 treatment groups were significantly higher than those of the control group (p<0.05). The digestibility of DM and OM for the control group (62.39~63.39%) and the T1 treatment group (65.02~65.25%) were significantly higher than those of the T3 treatment group (56.39, 59.01%) (p<0.05). Further, nitrogen retention was significantly higher in the T1 treatment group (p<0.05). Thus, these results conveyed that productivity and nutrient utilization were similar between TMF with spent mushroom and wet brewer's grain and commercial feeds. However, this study also suggested that feed must contain 25~30% spent mushroom due to the fact that the productivity of Korean black goats was decreased by increasing the content of spent mushroom.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.4
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• pp.527-535
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• 2017

Heat management is one of the most critical issues in Polymer Electrolyte Membrane Fuel Cells (PEMFCs) installed inside the fuel cell power pack of a fuel cell battery hybrid UPS. If the heat generated by the chemical reaction in the fuel cell is not rapidly removed, the durability and performance of the fuel cell may be affected, which may shorten its lifetime. Therefore, the objective of this study is to select and propose a proper cooling method for the fuel cells used in the fuel cell power pack of a UPS. In order to find the most appropriate cooling method, the various design factors affecting the cooling performance were studied. The numerical analysis was performed by a commercial program, i.e., COMSOL Multiphysics. Firstly, the surface temperature of the 1 kW class fuel cell stack with the cooling fans placed at the top was compared with the one with the cooling fans placed at the bottom. Various rotation speeds of the cooling fan, viz. 2,500, 3,000, 3,500, and 4,000 RPM, were tested to determine the proper cooling fan speed. In addition, the influence of the inhaled air flow rate was investigated by changing the porous area of the grille, which is the entrance of the air flowing from the outside to the inside of the power pack. As a result, it was found that for the operating conditions of the 1 kW class PEMFC to be acceptable, the cooling fan was required to have a minimum rotating speed of 3500 RPM to maintain the fuel cell surface temperature within an acceptable range. The results of this study can be effectively applied to the development of thermal management technology for the fuel cells inside the fuel cell power pack of a UPS.

• Journal of Korean Society of Forest Science
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• v.90 no.1
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• pp.74-82
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• 2001

The effects of Al and Mn concentration on dry weight growth, nutrient status and gas exchange rates of 2-Year-old Japanese red pine(Pinus densiflora) seedlings grown in a nutrient culture solution were investigated. Al was added as aluminum chloride at 0, 10, 30 or 60ppm, and Mn was added as manganese chloride at 0, 30 or 60ppm to the nutrient culture solution. The pH of the solution was maintained at 4.0 by adding HCl or NaOH solution. The seedlings were transplanted into the nutrient culture solution, then they were grown in a greenhouse for 90 days. The interactive effects of Al and Mn on the dry weight growth of the seedlings were not significant. There were a main effect of Al or Mn on the dry weight growth and element concentrations of the seedlings. The treatment with Al of ${\geq}10ppm$ or that with Mn of 60ppm induced a significant reduction in the dry weight growth, which indicates that the effect of Al is stronger than that of Mn. The chlorophyll content of needles was not affected by Al treatment, but was significantly reduced by treatment with Mn of 60ppm. Furthermore, the treatment with Al of 60ppm or that with Mn of ${\geq}30ppm$ caused a significant reduction in the dark respiration rate of the roots. The net photosynthetic rate of the seedlings reduced with increasing the concentration of Al or Mn in the nutrient culture solution, which suggests that Al or Mn induced reductions in the relative growth rate(RGR) and net assimilation rate(NAR) of the seedlings were mainly due to the decrease of net photosynthesis.

• (The)Study of the Eastern Classic
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• no.63
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• pp.83-113
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• 2016

This paper is focused on objective and meaning of its compilation through reviewing system, composition, method of description, and content of "Jwagyebudam". "Jwagyebudam" has all round form of a history and character book by recording via arranging figures from the end of 16th century to the middle of 18th century in a chronological order. Figure were not only assigned at close range by steretyping people into groups to a degree in it, but also recorded in a chronological order. In view of method of description, "Jwagyebudam" concentrated a theme by recording via separating different people associated from a figure and content of the same event by using the same method like 'Hogeonbeom(互見法)' shown in "Sagiyeoljeon(史記列傳)". In addition, it obtained effect to objectify evaluation of figures included. In a method of embodying figures, it has described concretely and in a three dimensions figures by recording anecdotes and poems associated with them via focusing on lifelong characteristic aspect of corresponding figures. In other words, "Jwagyebudam" can be called by biographies or character books, writings specialized in characters center among writings of method to weave freely experience. In a broad sense, it can be called a writing to cover a function of history book, poem and picture. This was located to a starting point of variation of inclusive and descriptive method. Namely, several kinds of writings in late Joseon dynasty can show aspect to fulfill specialized aspect gradually.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2019.10a
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• pp.82-82
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• 2019

황해쑥(Artemisia argyi Lev. et. Vnt)은 국화과의 다년생 초본 식물로서 쑥, 산쑥과 함께 건조한 것이 애엽이라는 생약재로 쓰이며 2016년 기준 전국적으로 81 ha에서 871톤이 생산되고 있다. 주요 유효성분으로 Eupatilin, Jaceosidin 등이 있으며 위궤양에 효과가 있다고 알려져 있어 최근에는 스티렌정 등 신약원료로 각광 받고 있다. 황해쑥은 종자번식 뿐만 아니라 포복경을 이용한 영양번식이 가능하며 현재까지 '섬애' 등 1품종이 개발되어 있으나 농가와 산업체가 요구하고 있는 수량성 또는 Eupatilin 등 성분함량이 높은 품종개발이 필요하다. 국내 연구 결과를 보면 대부분 년 1회 수확을 기준으로 연구되어 왔으나 실제로는 년 2회 수확하는 경우가 더 많다. 따라서 본 실험에서는 년 1회 뿐만 아니라 년 2회로도 수확하여 조사하였다. 시험재료는 AA1801 등 7계통 이며, 시비량은 10 a 당 질소 15.3 kg 인산 20 kg 가리 5 kg이고, 흑색 비닐을 피복한 후 조간 30 cm 주간 15 cm로 하였다. 시험구배치는 난괴법 3반복으로 하였으며 포복경을 5 cm로 잘라 4월 19일에 정식하였다. 1회 수확 시에는 8월 12일, 2회 수확 시에는 6월 17일, 9월 19일에 수확 하였다. 년 1회 수확 시 계통 별 생육특성을 보면, 초장은 202.4~231.5 cm로 평균 213.6 cm 였으며 경경은 10~12.14 mm로 평균 10.9 mm 였다. 분지수는 32.6~37.3개로 평균 35.2개 였으며 엽병장, 엽장, 엽폭은 2.4~4.2 cm, 9.3~12 cm 9.2~12.2 cm로 평균 3.3 cm, 10.7 cm 그리고 10.9 cm 였다. 전초의 생중량과 건중량은 각각 4.9~6.9 kg, 1.8~2.7 kg로 평균 5.5 kg, 2.1 kg 이였다. 특히 AA1902는 다른 계통에 비해 분지수는 적었으나 초장이 크고 경경이 굵었으며 생중량과 건중량도 가장 무거웠다. 년 2회 수확 시 전초의 생중량과 건중량은 각각 5.1~6.2 kg, 1.7~2.0 kg로 평균 5.6 kg, 1.8 kg 이였다. 수량성으로 봤을때는 AA1902는 1회 수확에 적합하며 AA1801, AA1802는 2회 수확 시 생중량과 건중량이 무거웠다. 또한 AA1903의 경우 수확 회수와 상관없이 수량성이 높은 계통으로 판단되었다. 본 자료는 황해쑥 품종육성의 기초자료로 활용하고자 한다.

• Geophysics and Geophysical Exploration
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• v.6 no.4
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• pp.171-179
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• 2003

In land and marine seismic survey, we generally set receivers with equal interval suppose that sampling interval Is too narrow. But the cost of seismic data acquisition and that of data processing are much higher, therefore we should design proper receiver interval. Spatial aliasing can be occurred on seismic data when sampling interval is too coarse. If we Process spatial aliasing data, we can not obtain a good imaging result. Trace interpolation is used to improve the quality of multichannel seismic data processing. In this study, we applied the Spitz algorithm which is widely used in seismic data processing. This algorithm works well regardless of dip information of the complex underground structure. Using prediction filter and original traces with linear event we interpolated in f-x domain. We confirm our algorithm by examining for some synthetic data and marine data. After interpolation, we could find that receiver intervals get more narrow and the number of receiver is increased. We also could see that continuity of traces is more linear than before Applying this interpolation algorithm on seismic data with spatial aliasing, we may obtain a better migration imaging.

• The Journal of the Korea Contents Association
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• v.21 no.9
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• pp.471-476
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• 2021

Personal mobility (PM) is a new concept of transportation used by one or two people using electricity. Personal transportation aims to move quickly and conveniently over an ambiguous distance that is too close to the destination and too far to walk. In particular, as electric kickboard sharing services have become more common in recent years, they are receiving great popularity from citizens. However, it is necessary to come up with an alternative solution as it is acting as a risk not only to users but also to pedestrians and road drivers. Therefore, in order to present measures to establish and improve a safe personal mobility utilization environment, this research was conducted as follows. First, based on GPS data from shared electric kickboards, the usage status in everyday life was examined and analyzed in detail. Second, it is convenient to rent and return shared electric kickboards directly to applications regardless of time, and it is highly accessible to rent them from their location and reach their destination. Based on these findings, this study suggests that careful access to rental and return could have a more positive effect on users and pedestrians by installing a cradle in a place where there is more use than disorderly device placement and expansion.

• Journal of the Korea Convergence Society
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• v.12 no.12
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• pp.509-518
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• 2021

This study was conducted to examine the effects of auricular acupressure on quality of sleep and depression. Adults who had insomnia for over 1 month were recruited. Participants were distributed randomly to the experimental group(n=22) and the control group(n=22). The experimental group received auricular acupressure on Shen men(TF2), insomnia 1(SF4), insomnia 2(SF1), and anti-depression(LO8) for 1 week. The contrast group received sleep hygiene education. The mean differences of the quality of sleep were 4.05±2.52 in the experimental group and 1.45±3.77 in the control group. Auricular acupressure significantly decreased insomnia in the experimental group compared to the control group(t=3.07, p=.004). Depression scores after acupressure were not different between the experimental group and the control group. After controlling the religion as a covariate, the mean difference of depression in the experimental group was higher than the control group(F=4.22, p=.046). In conclusion, auricular acupressure decreased insomnia and depression. Therefore, further studies on different acupressure points such as shen men, jiao gan, heart, pi zhi xia, and endocrine are recommended.

• KIPS Transactions on Computer and Communication Systems
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• v.10 no.7
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• pp.191-198
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• 2021

Since the size of training dataset become large and the model is getting deeper to achieve high accuracy in deep learning, the deep neural network training requires a lot of computation and it takes too much time with a single node. Therefore, distributed deep learning is proposed to reduce the training time by distributing computation across multiple nodes. In this study, we propose hybrid allreduce strategy that considers the characteristics of each layer and communication and computational overlapping technique for synchronization of distributed deep learning. Since the convolution layer has fewer parameters than the fully-connected layer as well as it is located at the upper, only short overlapping time is allowed. Thus, butterfly allreduce is used to synchronize the convolution layer. On the other hand, fully-connecter layer is synchronized using ring all-reduce. The empirical experiment results on PyTorch with our proposed scheme shows that the proposed method reduced the training time by up to 33% compared to the baseline PyTorch.