• Tribology and Lubricants
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• 제15권4호
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• pp.335-342
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• 1999

Corrosion of the disk has been an ongoing concern for the manufacturers of hard disk drives. With the advent of magnetoresistive (MR) head, very low levels of corrosion and contamination become more critical since the raised defects and corrosion products on the disk surface-anything that heats the MR sensor due to the contact-can distort the output signal of the head. This phenomenon is called as thermal asperity. In this paper, the effect of corrosion as a form of Co migration on the occurrence of thermal asperity in MR drives was investigated. The corrosion test at high temperature (60$^{\circ}C$) and high relative humidity (80%) was emphasized in this study and the testing results at ambient condition were compared. The corrosion on the disks was characterized as the amount of Co ion migration using an ion chromatography (IC) and a time-of-flight secondary ion mass spectroscopy (TOF-SIMS). It is proved that corrosion on the disk surface after storage testing is closely correlated to the amount of Co ions migration from the magnetic layer to disk surfaces and higher Co migration causes more thermal asperities in the drive. In order to reduce Co migration, several methods such as burnishing process and structure of the carbon overcoat were investigated. It is found that the hydrogenated carbon overcoat shows the least Co migration among different types of overcoat layer. However, the most effective way to reduce Co migration is the application of Cr layer between the overcoat and the magnetic alloy layer.

• 정보과학회 컴퓨팅의 실제 논문지
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• 제22권1호
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• pp.26-31
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• 2016

Migrim(Migration enhanced Grid Middleware)은 임베디드 단말과 다중 서버들 간의 통신 미들웨어이다. 기존의 통신 미들웨어는 단말이 서버의 자원 상태를 알지 못하기 때문에, 특정 서버에 부하가 집중될 경우에도 그 서버로 계속 요청을 보내는 문제가 있다. 또한 단말은 서버가 가진 정보를 알 수 없기 때문에, 트랜잭션 처리 결과에 대한 정확도를 보장하기 어렵다. 병목현상과 응답 정확도 문제 해결을 위해, 본 논문에서는 Migrim에 적용한 커넥션 이전과 트랜잭션 이전 기법을 제안한다. 커넥션을 다른 서버로 위임하는 과정인 커넥션 이전을 통해 전체 서버에 부하를 균등하게 분산시킬 수 있고, 트랜잭션 처리를 다른 서버로 위임하는 과정인 트랜잭션 이전을 통해 응답의 정확도를 높일 수 있다.

• 정보처리학회논문지A
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• 제9A권4호
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• pp.555-562
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• 2002

이동 에이전트가 연속적으로 다근 노드로 이주될 때 총 작업수행 시간은 방문해야할 순서에 따라 변경될 수 있다. 효율적인 이주 알고리즘은 초기 상태에서 목적 상태로 수행되기 위해 최소한 수행 시간을 제공하는 수행 순서를 의미하며, 이동 에이전트의 효율적인 이주 알고리즘을 통해 개발자가 원하는 작업의 총 수행 시간을 최소화시킬 수 있다. 기존의 대표적인 이동 에이전트인 Aglets, Voyager, Odyssey 등은 이주할 때 네트워크 상태와 이주할 노드의 상태를 고려하지 못함으로써 효율적인 이주를 보장할 수 없다. 본 논문은 이동 에이전트에서 효율적인 이주를 위해 AMIS를 제안한다. AMIS는 이동 에이전트의 총 이주 시간을 최소화하며, 안전하고 견고한 이주를 위해 최단 수행 순서를 제공한다.

• Current Applied Physics
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• 제18권11호
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• pp.1368-1374
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• 2018

In this paper, forced vibration was used to regulate the droplet migration, fully recording the transient migration of droplets on a micro-textured substrate under the resonance frequency by a high-speed camera. The influence of resonance frequency and dynamic migration characteristics of droplets on the solid micro-texture surface under lateral vibration were researched. The experiment demonstrates that the driving force is caused by the difference between the left and right contact angles made the droplet oscillate and migrate, and as time t increases, the left and right contact points are periodically shifted and the amplitude of migration increases. Therefore, based on the droplet migration behavior and its force balance mechanism, a spring vibration model of migration behavior of the vibrating droplet micro unit was set up to predict the complete trajectory of its migration on a solid surface. The calculation results show that the theoretical displacement is less than the experimental displacement, and the longer the time, the larger the difference. Affected by the vibration, part of the droplet permeates through the micro-texture, resulting in the droplet losing height and the contact angle becoming smaller as well. While the other part of droplet overcomes the internal surface tension to migrate.

• 전기전자학회논문지
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• 제25권4호
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• pp.770-773
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• 2021

본 논문에서는 tapering과 ferroelectric(HfO₂)구조가 적용된 3D NAND flash memory의 프로그램 이후 시간경과에 따른 retention특징을 분석했다. Nitride에 trap된 전자는 시간이 지남에 따라 lateral charge migration이 발생한다. 프로그램 이후 시간이 지남에 따라 trap된 전자가 tapering에 의해 두꺼워진 채널 쪽으로 lateral charge migration이 더 많이 발생하는 것을 확인했다. 또한 Oxide-Nitride-Ferroelectric (ONF) 구조는 polarization에 의해 lateral charge migration이 완화되기 때문에 기존 Oxide-Nitride-Oxide (ONO) 구조 보다 문턱전압(V_th)의 변화량이 줄어든다.

• 한국지역지리학회지
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• 제20권2호
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• pp.153-162
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• 2014

본 연구는 연변조선족자치주 조선족 마을 지명을 분석하여 한반도에서 유래된 이식지명의 분포와 유형을 파악하고자 하였다. 연구결과 연변조선족자치주에 분포하는 2,015개 마을 중, 조선족 거주지역은 945개 마을로 분석되었 다. 조선족 거주지 지명을 분석한 결과 한반도에서 유래된 이식지명은 51개로 파악되었다. 중국의 시대적 변천에 따라 한반도 기원의 이식지명은 현재까지, 34개 지명이 소실되었고, 유지된 지명은 16개, 그리고 소실 후 다시 복원된 지명은 1개로 나타났다. 이식지명은 명명 방법에 따라 소지역 직접이식, 대지역 직접이식, 병합이식으로 나눌 수 있었다. 소지역 직접이식은 전북 정읍, 무주와 같이 기원지와 도착지 지명이 같은 경우, 대지역 직접이식은 강원도 사람들이 마을을 이루어 명명한 강원촌, 그리고 병합이식은 함경도 길주와 석성면 지명이 결합되어 길성촌으로 명명된 경우가 예가 된다. 본 연구결과는 민족의 이주과정 및 정체성 연구를 위한 기초 정보를 제공해 줄 수 있을 것으로 기대된다.

• Biomolecules & Therapeutics
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• 제30권2호
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• pp.170-178
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• 2022

The airway epithelium is equipped with the ability to resist respiratory disease development and airway damage, including the migration of airway epithelial cells and the activation of TLR3, which recognizes double-stranded (ds) RNA. Primary cilia on airway epithelial cells are involved in the cell cycle and cell differentiation and repair. In this study, we used Beas-2B human bronchial epithelial cells to investigate the effects of the TLR3 agonist polyinosinic:polycytidylic acid [Poly(I:C)] on airway cell migration and primary cilia (PC) formation. PC formation increased in cells incubated under serum deprivation. Migration was faster in Beas-2B cells pretreated with Poly(I:C) than in control cells, as judged by a wound healing assay, single-cell path tracking, and a Transwell migration assay. No changes in cell migration were observed when the cells were incubated in conditioned medium from Poly(I:C)-treated cells. PC formation was enhanced by Poly(I:C) treatment, but was reduced when the cells were exposed to the ciliogenesis inhibitor ciliobrevin A (CilioA). The inhibition of Beas-2B cell migration by CilioA was also assessed and a slight decrease in ciliogenesis was detected in SARS-CoV-2 spike protein (SP)-treated Beas-2B cells overexpressing ACE2 compared to control cells. Cell migration was decreased by SP but restored by Poly(I:C) treatment. Taken together, our results demonstrate that impaired migration by SP-treated cells can be attenuated by Poly(I:C) treatment, thus increasing airway cell migration through the regulation of ciliogenesis.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.960-964
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• 2004

During system resource improvement process that based on Object-Oriented technology could be affect to the continuous system performance if lack appropriate management and control objects mechanism. This paper proposes a methodology to support continuous system performance and its stability. The adoption is based on Java Container Framework and Collections Framework for object collection. Also includes Software Engineering, Object Migration and Multiple Class Loaders mechanism accommodate to construct Continuous Migration Container (CMC). CMC is a runtime environment provides interfaces for management and control to support upgrading object process. Upgrade object methodology of CMC can be divided into two phase are object equivalence checking and object migration process. Object equivalence checking include object behavior verification and functional conformance verification before object migration process. In addition, CMC use Multiple Class Loaders mechanism to support reload effected classes instead of state transfer in migration process while upgrading object. These operations are crucial for system stability and enhancement efficiency.

• 한국세라믹학회지
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• 제32권10호
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• pp.1117-1122
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• 1995

The effect of grain boundary structure on zigzag migrtion has been studied. Five kinds of a(2110)-m(1010) diffusion couples with different twist angles by 30$^{\circ}$from a [0001] common direction of each plane were prepared. When chromia (Cr2O3) was added to the diffusion couples by a vapor phase, zigzag migration of the grain boundary occurred. The fraction of zigzag migration did not essentially vary with the twist angle, but the magnitude and migration distance of individual migrating segment varied. The variation of CIGM morphology thus appears to result from the change in grain boundary mobility due to microscopic deviation of grain boundary structure out of a macroscopic grain boundary orientation.

• Asian review of World Histories
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• 제3권2호
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• pp.171-200
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• 2015

At its simplest, this essay provides a narrative of migration in Asia since the arrival of Homo sapiens some 70,000 years ago. More fully, it presents the case for conducting long-term, world-historical interpretation for Asia with attention to multiple perspectives, which has become increasingly central to global historical analysis. Following an introductory articulation of the benefits of long-term interpretation, the second section presents a balance of three perspectives-empire, exchange, and migration-as frameworks for interpreting the Asian past. The third section presents further detail on migration in long-term Asian history. The concluding section identifies four changes in patterns of migration during the past two centuries and emphasizes the underlying importance of cross-community migration in long-term human biological and social evolution.