• 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.

• 한국신뢰성학회:학술대회논문집
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• 한국신뢰성학회 2001년도 정기학술대회
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• pp.489-496
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• 2001

컴퓨터 키보드의 시장 불량품을 분석한 결과 여러 키가 동시에 입력되는 현상이 다수 발생되는 것을 알 수 있었다. 정밀분석결과 이의 원인이 키보드 membrane의 패턴을 구성하는 은(Ag) paste의 ion migration발생에 의한 것임을 알 수 있었다. 재현실험을 통해 고온 고습한 환경에서 장시간 사용하다보면 membrane내부로 수분이 침투하여 패턴간에 Ag ion migration이 발생되어 키 동작 오류를 유발시킴을 알 수 있었다. 이에 대한 대책안으로 제조 원가에 크게 영향을 주지 않으면서 migration을 크게 억제할 수 있는 준방수 방식의 membrane을 채택하여 4$0^{\circ}C$, 90%RH 환경에서 최소 5년을 보증할 수 있는 키보드를 제작하였다. 또한, 키보드 membrane의 ion migration 시험시 정상사용 조건을 가속시킬 수 있는 재현 및 검증시험법(85$^{\circ}C$, 85%RH, 가속계수 17배)을 개발하였다.

• 디지털산업정보학회논문지
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• 제13권4호
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• pp.153-162
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• 2017

Advances in communication technologies and the decreasing cost of computers have made distributed computer systems an attractive alternative for satisfying the information needs of large organizations. This paper presents a distributed algorithm for performance improvement through load balancing and file migration in distributed systems. We employed a sender initiated strategy for task migration and used learning automata with several internal states for file migration. A task can be migrated according to the load information of a computer. A file is migrated to the destination processor when it is in the right boundary state. We also described an analytical model for load balancing with file migration to verify the proposed algorithm. Analytical and simulation results show that our algorithm is very well-suited for distributed system environments.

• 동의생리병리학회지
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• 제23권2호
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• pp.480-487
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• 2009

Atherosclerosis, slow progressing inflammatory lesion in arteries, is one of the major causes of cardiovascular diseases. As mortality due to cardiovascular disease keeps increasing in Korea, researches on pathological mechanism of atherosclerosis may be beneficial in fighting against cardiovascular diseases. It is known that migration and MMP-9 secretion of Vascular Smooth Muscle Cell(VSMC) play a significant part in pathogenesis of atherosclerosis, although detailed mechanism of entire process is not clarified. We investigated whether the seeds of Trichosanthes kirilowii maxim (TS), inhibit migration and MMP-9 production of HASMC(human aortic SMC), which were induced by TNF-${\alpha}$ treatment. Migration assay showed that TS inhibited the migration of HASMC induced by TNF-${\alpha}$, in dose dependent manner. Also by Zymography MMP-9 production of HASMC was found to be reduced by TS, both in time and in dose dependent manner. Western blotting results suggest TS suppress activity of MAPkinases.

• Computers and Concrete
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• 제14권3호
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• pp.263-277
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• 2014

This study investigated four electric field configurations of two-dimensional accelerate lithium migration technique (ALMT), including line-to-line, plane-to-line, contour-to-line and plane-to-plane, and analyzed the ion migration behavior and efficiency. It was found that the free ion distribution diagram and voltage distribution diagram were similar, and ions migrated in the power line direction. The electrode modules were used for the mortar specimen with w/c ratio of 0.5. The effectively processed areas accounted for 14.1%, 39.0%, 49.4% and 51.4% of total area respectively on Day 28. Larger electrode area was more advantageous to ion migration. In addition, it was proved that the two-dimensional electric field could be divided into different equifield line active regions, and regarded as affected by one-dimensional electric field, and the ion migration results in various equifield line active regions were predicted by using the duration analysis method based on the theoretical model of ion migration obtained from one-dimensional test.

• 전자통신동향분석
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• 제16권2호통권68호
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• pp.73-84
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• 2001

기업용 데이터 서비스는 이제 음성, 화상, 데이터의 통합 패러다임과 전자상거래 등의 상거래 패러다임의 변화에 따라 기업의 주요 자산으로 인식되고 있다. 즉, 얼마나 기업망을 효율적으로 구성, 이용하고 또한 이를 생산 요소로 활용하느냐에 따라 기업의 생산성뿐만 아니라 수익성에도 커다란 영향을 미친다. 따라서 많은 기업 이용자들은 그들의 미래 데이터망에 대한 이전(Migration)에 신중을 기할 수밖에 없으며 이제 단순한 비용효율화 방향의 대체 서비스 모색이 아닌 기업 가치사슬상의 핵심 요소로 인식의 변화가 일고 있다. 이에 데이터 서비스 제공사업자들은 그들의 요구에 부응하는 미래 데이터 하부구조 투자와 서비스 개발을 서두르고 있으며, 이용자들의 자연스러운 Migration Path를 전략적으로 구성하고 있다. 본 고는 이용자들의 Migration 개념 변화를 고찰하고 미국 3대 사업자들의 전용회선, 프레임릴레이, ATM 서비스를 대상으로 Migration 전략을 유형화하여 비교 분석한다. 또한 이러한 분석을 통하여 국내 사업자들을 위한 전략적 시사점을 제시한다.

• 동력기계공학회지
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• 제9권1호
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• pp.64-69
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• 2005

In evaluation of electronic reliability on the PCB(Print Circuit Borad),electrochemical migration is one of main test objects. The phenomenon of electrochemical migration occurs in the environment of the hight humidity and the hight temperature under bias through a continuous aqueous electrolyte. In this paper, the generating mechanism of electrochemical migration is investigated by using water drop acceleration test under various waters. The waters used in the water drop test are city water, distilled water and ionic water. It found that the generated velocity of electrochemical migration depended on electrolyte quantity which included in the various waters.

• EDISON SW 활용 경진대회 논문집
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• 제4회(2015년)
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• pp.163-166
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• 2015

Intramolecular energy migration in a cyclic porphyrin array is spontaneous transfer of energy from one excited site to another. Since the efficiency of energy migration is inversely proportional to distance, the energy migration is occurred on their adjacent sites more often than distant ones. Therefore, the energy migration in the cyclic porphyrin array is largely dependent on their conformational characters. However, evaluation of conformational information by means of experimental tools is ambiguous since their limited resolution. In this work, we calculate the internal angle and distance distributions of cyclic porphyrin arrays using molecular dynamics simulations to obtain conformational information. To evaluate the angle and distance distributions respect to molecular size, we constructed molecules with n porphyrin dimers (n=1,3,7) in implicit solvent environment. Performing molecular dynamics simulations, we modulated alkyl groups to investigate additional conformational effects of the system.

• 약학회지
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• 제35권3호
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• pp.165-173
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• 1991

Effects of eight flavonoids and their related compounds on leukocytes migration, superoxide anion production and lipid peroxidation in the phagocytosis of latex beads or E. coli by guinea pig peritoneal exudate cells were studied in vitro. It shows that most of flavonoids generally inhibited the leukocytes migration and production of superoxide anion and malonedialdehydes. Their inhibitory activities in the phagocytosis of latex beads had more active than that of E. coli. Quercetin has the most inhibitory activity in leukocytes migration and production of superoxide anion and lipid peroxides at the concentration of 1, 2 and 10 $\mu{M}$. Catechin and rutin at the concentration of 2 and 10 $\mu{M}$ inhibited significantly the production of superoxide anion and lipid peroxides. Flavone, catechin, naringin and rutin at the concentration of 2 and 10 $\mu{M}$ inhibited significantly the leukocytes migration.

• 한국컴퓨터정보학회:학술대회논문집
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• 한국컴퓨터정보학회 2019년도 제60차 하계학술대회논문집 27권2호
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• pp.7-8
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• 2019

In this paper, we applied the migration technique to real-time tasks that have relatively low criticality but still important to be dropped by the mixed-criticality scheduling algorithms. The proposed drop and migrate algorithm analyzes the schedulability by calculating CPU utilization and response time of using task migration. We provide analysis to guarantee the deadline of LO-tasks, by transforming the response time equation specified with migration time. The transformed response time equation was able to analyze the migration schedulability. This algorithm can be used with various mixed-criticality schedulers as a supplementary method. We expect this algorithm will be used for scheduling LO-tasks such as communication task that requires safety guarantee especially in platooning and autonomous driving by utilizing the advantages of multiple node connectivities.