• Journal of Information Processing Systems
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• 제13권3호
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• pp.476-490
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• 2017

In the centralized cloud controlled environment, the decision-making and monitoring play crucial role where in the host controller (HC) manages the resources across hosts in data center (DC). HC does virtual machine (VM) and physical hosts management. The VM management includes VM creation, monitoring, and migration. If HC down, the services hosted by various hosts in DC can't be accessed outside the DC. Decentralized VM management avoids centralized failure by considering one of the hosts from DC as HC that helps in maintaining DC in running state. Each host in DC has many VM's with the threshold limit beyond which it can't provide service. To maintain threshold, the host's in DC does VM migration across various hosts. The data in migration is in the form of plaintext, the intruder can analyze packet movement and can control hosts traffic. The incorporation of security mechanism on hosts in DC helps protecting data in migration. This paper discusses an approach for dynamic HC selection, VM selection and secure VM migration over cloud environment.

• 무역학회지
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• 제46권2호
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• pp.177-191
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• 2021

Based on the existing OFDI (outward foreign direct investment) literature, this study endeavored to verify how the corruption of host countries affects the partner strategy of EMNEs (emerging multinational enterprises) when EMNEs enter global markets through joint ventures. Following the existing literature, this study classified corruption and partner strategies into two categories, respectively. First, the corruption of host country was divided into grand corruption and petty corruption. Second, EMNEs' joint venture partner strategy was divided into home country partner joint venture and host country (i.e., local) partner joint venture. Our hypothesis suggested that the greater the host country's grand corruption, the more EMNEs would choose the host country partner, while the strong petty corruption leads to the preference of home country partner in host country. The hypotheses were verified with a sample of 890 foreign direct investment cases of Chinese multinational companies from 2005 to 2015. As a result of the study, regardless of the degree of corruption, it was found that they prefer joint ventures with home country partners when EMNEs enter the global market through joint ventures.

• Biotechnology and Bioprocess Engineering:BBE
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• 제5권2호
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• pp.84-91
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• 2000

Mycopasma contamination of tissue culture cells easily evades detection and, thus, represents a continous therat to cell biologists. In case where infected cell can not simply be replaced, attempts have to be made to eradicate mycoplacma from the tissue culture cells. A variety of anti-microbial agents have been shown to be toxic to mycoplasma strains ; however, cell associated mycoplasma are often protected from antibiotics at concentrations shown to be effective in vitro. Antibiotic concentrations high enough to be lethal to cell as sociated mycoplasmas frequently are also detrimentrations to the host cells, while moderately increased antibiotic levels tolerated by the host cells often lead to only temporary growth suppression and/or to the emergence of mycoplasma strains resistanct even to high concentrations of the antibiotis applied. Hare, a genetic approach for the elimination of mycoplasma from tissue culture cells that overcomes thens limitations is described. By expression of a selection marker conferring resistance to an otherwise toxic agent, Acholeplasma laidlawii infected BHK-21 cells used as the model system were enabled to temporarily tolerate antibiotic concentrations high enough to be lethal to cell associated mycopalsma while leaving the host cells unharmed. Upon successful mycoplasma eradicated, cultvation of the cured host cells in the absence of the selective agent yielded revertant cell clones that had regained susceptibillity to the toxic agent. Cressation of the selection marker expression was shown to result from the loss of the selection marker DNA, which is a consequence of the fact that the stable and permanent integration of foreign DNA in eucaryotic cell chrosomes is highly inefficient. Thus, the cells were cured from mycoplasma yet remained biochemically unaltered.

• 환경생물
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• 제25권4호
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• pp.370-377
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• 2007

납자루아과의 어류들과 산란습성이 유사한 중고기 Sarcocheilichtys nigripinis morii의 산란생숙주 선택성과 초기 생활사에서 나타나는 배와 자어의 적응 형질을 조사하였다. 중고기의 수정난은 조사수역에 동소적으로 서식하는 담수산 이매패들 중에서도 엷은재첩과 재첩의 체내에서만 관찰되어 숙주 특이성을 보였다. 산란되는 부위는 이매패의 외투강으로 수정난의 난막이 2배 정도로 크게 팽창하며, 부화 전 기관 형성이 완성되어 운동이 자유로운 eleutheroembyo 상태로 발달하는 점 등은 납자루아과와 차이를 보이는 생식전략으로 사료되었다. 그러나 자어기 난황 표면의 호흡 혈관이 크게 발달하는 점은 체내 기생에 따른 보상 형질로 판단되었다. 흑색소포의 발달은 느린 편으로 하미축골 부위에 발생하는 흑색반점은 본 종의 자어를 구분하는 특징이 될 것으로 사료되었다.

• 정보처리학회논문지A
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• 제11A권6호
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• pp.413-418
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• 2004

컴퓨터 하드웨어의 크기가 작아지고 성능이 향상되어 노트북, PDA 등 개인용 휴대 컴퓨터의 사용이 늘어남에 따라 물리적 위치에 관계없이 어느 곳에서나 원하는 정보를 손쉽게 접근하고자 하는 사용자들의 요구는 유비쿼터스 컴퓨팅 기술을 탄생시켰다. 본 연구에서는 기존의 유선환경에서 빠르고 안정적인 서비스를 위하여 사용한 콘텐츠 분산 네트워크 기술을 이동 환경에 적용하여 이동 호스트가 적절한 콘텐츠 서버를 선택하여 서비스 받음으로써 이동 중에도 단절 없이 콘텐츠를 서비스 받을 수 있는 방안을 제시하였다 이동 환경에 적합한 서버 선택 알고리즘을 제안함으로써 보다 효율적인 전송이 가능함을 실험을 통해 보였으며 이러한 연구는 유비쿼터스 컴퓨팅의 실현에 기여할 수 있을 것이다.

• 천문학회보
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• 제37권1호
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• pp.46.1-46.1
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• 2012

A unique ensemble of datasets is available for the AKARI North Ecliptic Pole (NEP) field, having being observed virtually across the whole electromagnetic spectrum. We have undertaken a study of radio sources in the NEP field and in particular radio-loud AGN. We present preliminary results concerning the identification of these radio-loud AGN using a host of different selection criteria. We aim to study the host galaxies of these systems within the current framework of galaxy evolution and the role that AGN play in it.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제17권2호
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• pp.312-334
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• 2023

In large-scale computing, cloud computing plays an important role by sharing globally-distributed resources. The evolution of cloud has taken place in the development of data centers and numerous servers across the globe. But the cloud information centers incur huge operational costs, consume high electricity and emit tons of dioxides. It is possible for the cloud suppliers to leverage their resources and decrease the consumption of energy through various methods such as dynamic consolidation of Virtual Machines (VMs), by keeping idle nodes in sleep mode and mistreatment of live migration. But the performance may get affected in case of harsh consolidation of VMs. So, it is a desired trait to have associate degree energy-performance exchange without compromising the quality of service while at the same time reducing the power consumption. This research article details a number of novel algorithms that dynamically consolidate the VMs in cloud information centers. The primary objective of the study is to leverage the computing resources to its best and reduce the energy consumption way behind the Service Level Agreement (SLA)drawbacks relevant to CPU load, RAM capacity and information measure. The proposed VM consolidation Algorithm (PVMCA) is contained of four algorithms: over loaded host detection algorithm, VM selection algorithm, VM placement algorithm, and under loading host detection algorithm. PVMCA is dynamic because it uses dynamic thresholds instead of static thresholds values, which makes it suggestion for real, unpredictable workloads common in cloud data centers. Also, the Algorithms are adaptive because it inevitably adjusts its behavior based on the studies of historical data of host resource utilization for any application with diverse workload patterns. Finally, the proposed algorithm is online because the algorithms are achieved run time and make an action in response to each request. The proposed algorithms' efficiency was validated through different simulations of extensive nature. The output analysis depicts the projected algorithms scaled back the energy consumption up to some considerable level besides ensuring proper SLA. On the basis of the project algorithms, the energy consumption got reduced by 22% while there was an improvement observed in SLA up to 80% compared to other benchmark algorithms.

• ETRI Journal
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• 제28권1호
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• pp.77-83
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• 2006

In order to improve the accuracy of cell selection in heterogeneous cellular systems, this paper proposes a fuzzy multiple-objective decision-based cell selection (FMDCS) strategy. Since heterogeneous cellular systems have different access technologies and multiple traffic classes, the strategy adopts cell type, data rate, coverage, transmission delay, and call arrival rate as evaluation indices, and uses different weight vectors according to the traffic classes of the mobile host. Then, a fuzzy multiple-objective decision algorithm is applied to select the optimal cell from all candidates. This paper also gives an instance analysis and simulation. The instance analysis shows FMDCS makes different selections for different traffic classes. Simulation results of the after-handoff quality-of-service (QoS) show the selected cell can provide MH optimal service.

• Journal of Microbiology and Biotechnology
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• 제20권10호
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• pp.1463-1470
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• 2010

E. coli has long been widely used as a host system for the manufacture of recombinant proteins intended for human therapeutic use. When considering the impurities to be eliminated during the downstream process, residual host cell DNA is a major safety concern. The presence of residual E. coli host cell DNA in the final products is typically determined using a conventional slot blot hybridization assay or total DNA Threshold assay. However, both the former and latter methods are time consuming, expensive, and relatively insensitive. This study thus attempted to develop a more sensitive real-time PCR assay for the specific detection of residual E. coli DNA. This novel method was then compared with the slot blot hybridization assay and total DNA Threshold assay in order to determine its effectiveness and overall capabilities. The novel approach involved the selection of a specific primer pair for amplification of the E. coli 16S rRNA gene in an effort to improve sensitivity, whereas the E. coli host cell DNA quantification took place through the use of SYBR Green I. The detection limit of the real-time PCR assay, under these optimized conditions, was calculated to be 0.042 pg genomic DNA, which was much higher than those of both the slot blot hybridization assay and total DNA Threshold assay, where the detection limits were 2.42 and 3.73 pg genomic DNA, respectively. Hence, the real-time PCR assay can be said to be more reproducible, more accurate, and more precise than either the slot blot hybridization assay or total DNA Threshold assay. The real-time PCR assay may thus be a promising new tool for the quantitative detection and clearance validation of residual E. coli host cell DNA during the manufacturingprocess for recombinant therapeutics.

• 한국미생물학회:학술대회논문집
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• 한국미생물학회 2008년도 International Meeting of the Microbiological Society of Korea
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• pp.144-146
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• 2008