• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.103-103
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• 2018

홍경천은 일반적으로 해발 2500~4500m에 자생하는 고원식물이다. 현재 중국에 알려진 홍경천의 종류는 대략 38종으로 알려져 있으며 이 가운데 10종이 보건식품으로 사용되어지고 있다. 중국 홍경천의 생육환경은 동북부지방, 서북부지방, 서남부지방으로 구분되어지고 있다. 이 가운데 동북부지방과 티베트 지방을 중심으로 한 서남부지방의 홍경천이 주로 많이 사용되어지고 있다. 이러한 홍경천은 극한의 생육환경으로 고산병 예방, 피로회복, 작업능력향상, 운동능력향상과 세균의 저항력향상, 진정작용과 강심작용, 조혈작용, 항산화작용등이 신경전달물질의 활동을 증진시키어서 스트레스 해소와 치매 및 인지력을 높여준다고 알려져 있다. 따라서 근무 능력을 향상 시킬 뿐만 아니라 수험생들의 집중력에도 좋은 효과를 나타내는걸로 보고되고 있다. 따라서 본 실험에서는 홍경천의 총 폴리페놀 함량과 항산화 활성을 조사했던 바, 홍경천의 잎과 뿌리에서 양호한 결과를 나타내었으며, 특히 항산화 작용은 뿌리와 잎 추출물에서 양호한 반응을 보였다. 또한 에탄올 추출물 보다 메탄올 추출물 처리구에서 더욱 더 양호한 항산화 활성을 나타났다. 이러한 결과들을 바탕으로 홍경천 추출액을 첨가시킨 요구르트를 만들어서 품질을 조사하였던 바 요구르트 성분, 품질과 보존성이 향상되는 것을 확인할 수 있었으며 항산화 활성도 양호한 반응을 보였다.

• Proceedings of the Plant Resources Society of Korea Conference
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• 2018.04a
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• pp.102-102
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• 2018

중국유(中國柚)의 주요성분은 비타민 C가 레몬보다 10배나 많이 함유되어 있고 또한 과피 안쪽에 펙틴 성분이 다량으로 함유되어 있다. 특히 과피가 일반 감귤류 보다 10배 이상 두꺼워 비타민P의 ?량 또한 다량으로 함유되어 있다. 즉, 유기산, 비타민P와 비타민C가 매우 많이 함유되어 있어서 예로부터 중국에서는 감기와, 피부노화, 피로를 방지하는데 사용되어져 왔으며 이러한 효능은 유기산에서도 많이 발생되었다. 그 밖에 비타민B군과 당질, 단백질등이 다른 감귤류 품종보다 많고, 모세혈관을 보호하는 헤스페리딘(비타민P)이 다량으로 함유되어 있어서 심혈관 질환 장애와 뇌졸증, 뇌출혈 등을 억제하는 효과를 가지고 있다. 또한 몸 안에 쌓여 있는 노폐물 등을 밖으로 배출시켜주는 효과가 양호하여 피부미용에 효과가 있는 것으로 알려져 있다. 본 실험에서는 중국유(中國柚)의 항산화활성과 총 폴리페놀 함량을 조사하였던 바, 과육보다 과피에서 폴리페놀 함량이 높게 나타났으며 항산화 활성도 과피에서 매우 양호한 결과를 나타내었다. 중국유(中國柚)의 품종별로 보면 과피가 두껍고 과육이 붉은색을 띈 품종에서 항산화 효과가 더 양호한 반응을 나타내었다. 이러한 결과는 과육에 함유되어있는 안토시아닌의 함량의 차이인 것으로 생각된다. 특히 과피가 과육의 추출과정에서 에탄올보다 메탄올 추출물에서 더 양호한 결과를 보였다. 이러한 결과들로 미루어볼 때 중국유(中國柚)의 항산화 활성은 천연화장품의 신소재로서의 가치를 가지고 있다고 판단된다.

• International Journal of Advanced Culture Technology
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• v.7 no.4
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• pp.69-75
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• 2019

In recent years, with the development of IT technology and mobile communication, the powerful communication function of the Internet will gradually eliminate the information asymmetry between supply and demand, and the third-party review website emerges as The Times require. Dianping.com was founded in 2003. After a few years of development, it has become an independent third-party consumer review website worldwide. One of the reasons for such great success is corporate culture, which plays an important role in human resource management. The competition of enterprises is not only the competition of products and cost advantages, but also the superior enterprise culture presented to customers in the international environment. The competition between third-party review sites has been very fierce. In just a few years, many foreign third-party review websites went public and made profits, but some domestic start-ups went bankrupt due to the lack of a good business model and corporate culture. A good business model is particularly important. Taking dianping.com as the research object and combining with the business model of the company, this paper studies the unique corporate culture of dianping.com, hoping to help the company through the investigation and research of this paper, so as to improve the company in the future. And put forward a certain practical significance and value.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.2
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• pp.80-89
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• 2014

In this paper, we conceive a context-aware recommendations system for water distribution in future smart water grids, with taking the end users' profiles, water types, network conditions into account. A spectral clustering approach is developed to cluster end users into different communities, based on the end users' common interests in water resources. A back-propagation (BP) neural network is designed to obtain the rating list of the end users' preferences on water resources and the water resource with the highest prediction rating is recommended to the end users. Simulation results demonstrate that the proposed scheme achieves the improved accuracy of recommendation within 2.5% errors notably together with a better user experience in contrast to traditional recommendations approaches.

• Journal of Animal Science and Technology
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• v.64 no.1
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• pp.97-109
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• 2022

Species are facing strong selection pressures to adapt to inhospitable high-altitude environments. Yaks are a valuable species and an iconic symbol of the Qinghai-Tibet Plateau. Extensive studies of high-altitude adaptation have been conducted, but few have focused on metabolism. In the present study, we determined the differences in the serum metabolomics between yaks and the closely related species of low-altitude yellow cattle and dairy cows. We generated high-quality metabolite profiling data for 36 samples derived from the three species, and a clear separation trend was obtained between yaks and the other animals from principal component analysis. In addition, we identified a total of 63 differentially expressed metabolites among the three species. Functional analysis revealed that differentially expressed metabolites were related to the innate immune activation, oxidative stress-related metabolism, and energy metabolism in yaks, which indicates the important roles of metabolites in high-altitude adaptation in yaks. The results provide new insights into the mechanism of adaptation or acclimatization to high-altitude environments in yaks and hypoxia-related diseases in humans.

• Journal of Communications and Networks
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• v.18 no.5
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• pp.784-795
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• 2016

In this paper, we investigate the resource allocation problem in time-varying heterogeneous wireless networks (HetNet) with multi-homing user equipments (UE). The stochastic optimization model is employed to maximize the network utility, which is defined as the difference between the HetNet's throughput and the total energy consumption cost. In harmony with the hierarchical architecture of HetNet, the problem of stochastic optimization of resource allocation is decomposed into two subproblems by the Lyapunov optimization theory, associated with the flow control in transport layer and the power allocation in physical (PHY) layer, respectively. For avoiding the signaling overhead, outdated dynamic information, and scalability issues, the distributed resource allocation method is developed for solving the two subproblems based on the primal-dual decomposition theory. After that, the adaptive resource allocation algorithm is developed to accommodate the timevarying wireless network only according to the current network state information, i.e. the queue state information (QSI) at radio access networks (RAN) and the channel state information (CSI) of RANs-UE links. The tradeoff between network utility and delay is derived, where the increase of delay is approximately linear in V and the increase of network utility is at the speed of 1/V with a control parameter V. Extensive simulations are presented to show the effectiveness of our proposed scheme.

• Geomechanics and Engineering
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• v.22 no.6
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• pp.541-552
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• 2020

With the increasing tension of current coal resources and the increasing depth of coal mining, the gob-side entry retaining technology has become a preferred coal mining method in underground coal mines. Among them, the technology of the gob-side entry retaining with the high-water filling material can not only improve the recovery rate of coal resources, but also reduce the amount of roadway excavation. In this paper, based on the characteristics of the high-water filling material, the technological process of gob-side entry retaining with the high-water filling material is introduced. The early and late stress states of the filling body formed by the high-water filling materials are analyzed and studied. Taking the 8th floor No.3 working face of Xin'an coal mine as engineering background, the stress and displacement of surrounding rock of roadway with different filling body width are analyzed through the FLAC^3D numerical simulation software. As the filling body width increases, the supporting ability of the filling body increases and the deformation of the surrounding rock decreases. According to the theoretical calculation and numerical simulation of the filling body width, the filling body width is finally determined to be 3.5m. Through the field observation, the deformation of the surrounding rock of the roadway is within the reasonable range. It is concluded that the gob-side entry retaining with the high-water filling material can control the deformation of the surrounding rock, which provides a reference for gob-side entry retaining technology with similar geological conditions.

• The Korean Journal of Quaternary Research
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• v.2 no.1
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• pp.51-85
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• 1988

The understanding of the faunal sequence and palaeoenvironment of East Asia since the Late Tertiary depends mainly on the knowledge of Chinese fauna and its environmental changes. The recent Chinese researches including geology, geomorphology, climats fluctuation and loess distribution of this area have provided that the rapid uplifting of Himalayas and Qinghai/Xizang Plateau since the Lower Pleistocene was a main selective factor for the process of environmental changes in this vast territory. Although different concepts of the Plio-Pleistocene boundary have been provided, its boundary can not exceed over 2 mya. Instead of the traditional zoogeographical dicthomy in China, faunal compositions of Pleistocene are divided into three faunal zones. The knowledge of macrofaunal evolution in China are useful to understand the palaeoecology of East Asia. Palaeoenvironment of Korea during the Pleistocene Period can be reconstructed by using the analogy of the current Chinese studies.

• Asian-Australasian Journal of Animal Sciences
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• v.13 no.2
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• pp.137-148
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• 2000

This paper is based on the 9 goat colonies along the middle and lower Yellow River valley and 7 local goat colonies in the Northeast, Tibet and the Yangtze valley. After collecting the same data about the 22 goat colonies in China and other countries, it establishes and composes the matrix of fuzzy similarity relation describing the genetic similarities of different colonies. It also clusters 38 colonies according to their phylogenetic relationship. The establishment of the matrix and the cluster are effected in terms of the frequency of 18 loci and 43 allelomorphs in blood enzyme and other protein variations. The study proves that the middle Yellow River valley is one of the taming and disseminating centers of domestic goats in the South and East of Central Asia. Compared with other goat populations in this vast area, the native goat populations in the west of Mongolian Plateau, the Qinghai-Tibet Plateau and the middle Yellow River valley share the same origin. The colonies in the lower Yellow River valley and those in the middle valley, however, are relatively remote in their phylogenetic relationship. The native goat colonies in the southeast of Central Asia can be classified into two genetic groups: "East Asia" and "South Asia" and the colonies in Southeast Asia belong to either group.

• Asian-Australasian Journal of Animal Sciences
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• v.29 no.9
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• pp.1363-1370
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• 2016

Rennet, a complex of enzymes found in the stomachs of ruminants, is an important component for cheese production. In our study, we described that yak chymosin gene recombinant Pichia pastoris strain could serve as a novel source for rennet production. Yaks total RNA was extracted from the abomasum of an unweaned yak. The yak preprochymosin, prochymosin, and chymosin genes from total RNA were isolated using gene specific primers based on cattle chymosin gene sequence respectively and analyzed their expression pattern byreal time-polymerase chain reaction. The result showed that the chymosin gene expression level of the sucking yaks was 11.45 times higher than one of adult yaks and yak chymosin belongs to Bovidae family in phylogenetic analysis. To express each, the preprochymosin, prochymosin, and chymosin genes were ligated into the expression vector $pPICZ{\alpha}A$, respectively, and were expressed in Pichia pastoris X33. The results showed that all the recombinant clones of P. pastoris containing the preprochymosin, prochymosin or chymosin genes could produce the active form of recombinant chymosin into the culture supernatant. Heterologous expressed prochymosin (14.55 Soxhlet unit/mL) had the highest enzyme activity of the three expressed chymosin enzymes. Therefore, we suggest that the yak chymosin gene recombinant Pichia pastoris strain could provide an alternative source of rennet production.