Enabling multi-domain service function chaining for network service outsourcing

Vu Anh Vu Soongsil university 2017 국내석사

Recently, Software-defined Networking and Network Function Virtualization has been reforming data centers, giving them the ability to accommodate various new technologies, including Service Function Chaining, which provides quick and flexible network service provision by defining an ordered list of service functions that data packets have to go through. Currently, service providers make service function chains from their services deployed in their data centers. However, in some situations, they need to outsource their services to other third-party providers. This thesis proposes a platform, including its architecture built on top of current Network Function Virtualization model and necessary protocols, to enable distributing Service Function Chaining over multiple managing domains, aiming to establish an environment for Network Service Outsourcing. On top of this platform, we propose a service function path selection algorithm which provides the balance between service chain startup delay and end-to-end latency, adapting to service function chain requirements. Finally, the implementation of the architecture and our algorithm performance evaluation will be shown. 최근에는 소프트웨어 정의 네트워킹 및 네트워크 기능 가상화가 데이터 센터를 개편하여 서비스 기능 체인을 포함한 다양한 신기술을 수용할 수 있게 되었다. 서비스 기능 체인은 데이터 패킷이 순서화 된 서비스 기능 목록을 정의하여 빠르고 유연한 네트워크 서비스를 제공한다. 현재 서비스 제공 업체는 데이터 센터에 구축 된 서비스만으로 서비스 기능 체인을 만든다. 그러나 일부 상황에서는 다른 공급 업체에 서비스를 아웃소싱 해야 한다. 본 논문에서는 네트워크 서비스 아웃소싱 환경 구축을 목표로 다중 관리 영역에 분산된 서비스 기능 체이닝을 가능하도록 하는 프로토콜과 플랫폼을 제안한다. 제안된 플랫폼에서 서비스 기능의 초기구성 지연과 종단간 서비스 지연 사이의 균형을 제공하는 서비스 기능 경로 선택 알고리즘을 구현하고 평가한다.

Clay mineralogy of Oligocene-Miocene sediments in the Cuu Long Basin : smectite diagenesis and its relation to paleotemperature

Vu, The Anh Graduate School, Yonsei University 2010 국내석사

Focusing of ultrasonic wave with metamaterials for nondestructive evaluation

Vu, Anh Hoang Sungkyunkwan University 2019 국내석사

Focusing ultrasound is quite often adopted in the ultrasonic nondestructive evaluation of materials and medical diagnostic of the human body. The recent methods for focusing of ultrasonic wave include focusing the ultrasonic beam to the expected position by adjusting the time delays to each element of phased array ultrasonic testing, concentrating multiple intersecting ultrasonic beam in high intensive focusing ultrasound and improving the lateral resolution of ultrasound images by extending aperture of a physical source achieved by processing measurements in synthetic aperture focusing. However, the imaging resolution of these methods is limited by the incident wavelength of ultrasound, when the propagation of wave oscillating with scale smaller than the wavelength, the evanescent waves do not contribute to the far fields. The development of new class of metamaterials has overcome this problem, the structures based on these metamaterials could focus the ultrasonic wave with resolution in sub-wavelength by its exotic behaviors such as negative refraction, negative bulk modulus, or negative mass under certain conditions. In this research we describe the numerical simulations and experimental demonstration of focusing ultrasonic waves through two designed structures of metammaterials, a system of channel connected to an array of Helmholtz resonators and an acoustic metamaterials device with the cross shape. The simulations were good agreement with experiment results on the focusing effect in the beam field of ultrasonic wave propagation at the certain frequency of each designed structures. The effect with different input frequencies of these structures is also analyzed.

Synthesis of magnesium oxide and its composites for removal of sulfur and phosphorus compounds and carbon dioxide

Vu Anh Tuan Graduate School, Yonsei University 2015 국내박사

본 논문에서는 높은 수치의 표면적과 기공 부피를 가진 mesoporous MgO를 합성하기 위해서, 동일한 aerogel 방법으로 준비된 hydrated MgO(HY-MgO)를 이용한 새로운 소성 방법을 개발하였다. 소성과정의 최종 온도, 가열 단계, 가열 속도를 조절한 결과, MgO의 물리적 특성과 흡착능은 변화하였다. 결과적으로, 분해에 중요한 2곳의 온도 범위를 소성 단계에 추가적으로 포함하는, 총 4단계의 소성과정에 걸쳐 합성된 MgO는 다른 소성과정에 의해서 만들어진 MgO에 비해서 MM에 대해서 2~11배의 높은 흡착능을 보였다. 2-Chloroethyl ethyl sulfide (2-CEES, 0.26 μg/mL)에 대해 향상된 분해능과 흡착능을 가지는 MgO?Fe2O3 와 MgO?SiO2 복합체를 합성하였다. 합성된 물질 모두 25°C 조건에서 각기 다른 전환율로 2-CEES을 분해할 수 있었다. MgO?Fe2O3 복합체는 에어로젤 방법으로 합성된 MgO (AP-MgO)와 MgO?SiO2 보다 높은 반응성을 보였다. 한편, SiO2의 첨가로 표면적은 증가하였으며 이로 인해 흡착능은 향상되었다. (49.3 mg/g). 건식, 습식 조건에서 methylphosphonate (DMMP)와 2-CEES에 대해서 높은 흡착능을 가진 물질을 합성하기 위해서, AP-MgO 합성과 같은 과정을 거쳐 carbon-coated magnesium oxide (MgO/C)를 합성하였다. 6.39 wt%의 낮은 탄소 함유량의 MgO/C는 DMMP, 2-CEES 에 대해서 순수 MgO나 활성탄 보다 높은 흡착능을 보였다. 습식조건에서 MgO/C 복합체는 DMMP, 2-CEES에 대해서 건조조건의 흡착능과 비교하여 약 91%, 86%의 수치를 보였으며, 이는 활성탄에 비해서 높은 수치였다. 중간 온도 범위에서 CO2 에 대한 흡착능을 향상시키기 위해서, 알칼리 복합체가 첨가되었다. 열 중량 분석을 통해서 CO2 흡착 속도와 흡착능에 대한 MgO/KNO3의 몰 분율, 소성 방법, 흡착 온도 영향을 분석하였다. 4단계의 소성을 거쳐 만들어진 1:0.2 몰 분율의 MgO/KNO3 복합체는 325°C, 120분 흡착 조건에서 13.9wt%의 높은 흡착능을 보였다. 이는 순수 MgO 흡착능의 7배에 달하는 수치이며, 복합체의 처음 10분 동안의 흡착능은 순수 MgO 총 흡착능의 70%에 달하는 값이다. 또한, MgO/KNO3의 반복 흡착 실험 동안의 흡착 속도와 안정성을 평가하였다. 더욱이, 고성능의 복합체(MgO?Na2CO3?NaNO3)를 합성하였는데, 본 복합체는 325ºC, 순수 CO2 조건에서 56wt%, 300ºC, 습식 혼합기체 조건에서 50.8 wt%의 높은 흡착능, 그리고 14번의 반복 흡착 실험에서 31.8wt%의 흡착능을 보였다. In this thesis, to synthesize mesoporous MgO with a high surface area and pore volume, a calcination procedure was developed for hydrated MgO (HY-MgO) prepared by the same aerogel method. The physical properties and sorption capacity of MgO were affected by final temperature, step, and heating rate during calcination. As the result, MgO prepared by the four-step calcination method, which had two additional steps in the significant decomposition temperature range, had 2-11 times higher sorption capacity of methyl mercaptan (MM) than MgO by other calcination methods. For destructive and enhanced sorption of 2-Chloroethyl ethyl sulfide (2-CEES, 0.26 ?g/mL) in N2 flow, MgO?Fe2O3 and MgO?SiO2 composites were synthesized. All of the prepared materials could decompose 2-CEES at 25 °C with different conversion degrees. The reactivity of MgO?Fe2O3 composites was higher than that of aerogel MgO (AP-MgO) and MgO?SiO2. On the other hand, the increased surface area, imparted by the addition of SiO2, led to the enhanced sorption capacity (49.3 mg/g). To develop a high-performance material for sorption methylphosphonate (DMMP) and 2-CEES in dry and humid conditions, carbon-coated porous magnesium oxide (MgO/C) composites were synthesized using the same procedure with AP-MgO. Under dry conditions, the sorption capacities of the MgO/C composite with a low carbon content of 6.39 wt% (MgO/C-1) were higher than those of pure MgO and activated carbon (AC). Under humid conditions, the sorption capacities of the MgO/C-1 composite for DMMP and 2-CEES under humid conditions remained at about 91 and 86% of those measured under dry conditions, and were higher than those of AC. To improve the sorption capacity of CO2 in intermediate temperature range of 250-400 ºC, the alkaline salts were added into composite. The effects of MgO/KNO3 molar ratio, calcination method, and sorption temperature on CO2 sorption rate and capacity were evaluated using a thermogravimetric analyzer. The MgO/KNO3 sample (molar ratio of 1:0.2 and four-step calcination) had the high CO2 sorption capacity of 13.9 wt% at 325 oC and 120 min, showing about 70% of the total sorption capacity within 10 min and about 7 times higher sorption capacity than pure MgO. Also, the sorption rate of CO2 and stability of MgO?KNO3 composite during cyclic test were investigated. Moreover, the excellent performance composite (MgO?Na2CO3?NaNO3) were developed, it showed very high CO2 sorption capacity (56 wt% at 325 ºC and pure CO2 and 50.8 wt% at 300 ºC with wet mixture gas) and high cyclic sorption capacity (31.8 and 29.4 wt% at 14th cycle under pure CO2 and wet mixture gas, respectively).

Fast Interpolation for Pruned Images

Anh Vu Le 동국대학교 2012 국내석사

Material technology is an important technology in the innovation and improvement in construction industry, including recycled materials, reused materials and new materials. Among them, recycled materials have many benefits, especially on environmental and economic aspects. Through the survey implemented, a study find the current trend of using recycled materials in the construction project in Vietnam and the difficulties when applying them. From these points, some main solutions to improve the use of recycled materials are considered and suggested. One of the solutions is the developing of new rating systems about recycled materials, through the control of the Government. By studying the rating systems which are used popularly in the world, analyzing and comparison of these ratings system, this study suggests and establish the new rating systems for construction recycled material contents. The other solutions are used for the parties involved in construction projects such as the investor, the contractor, the Government, the designer, the manufacturer or supplier, etc. For the assessment of these solutions, the survey are conducted. The results collected from the survey are classified and analyzed carefully through the statistic tools such as Excel statistical functions, Analysis Toolpak tools or PHStat tools, etc. Based on these results, the suitable solutions are considered and suggested in order to improving the using of recycled materials in construction projects in Vietnam.

Interpolation for Frame-Compatible Steroscopic 3DTV via Fast Key-Points Matching

Anh Vu Le 동국대학교 2015 국내석사

Frame-compatible packing is to reformat the stereo frames of 3D TV videos into a single frame of digital TV (DTV). This allows the stereo 3D (S3D) videos to be transmitted via the existing transmission infrastructure of the DTV. This thesis proposes a novel interpolation method to expand the decimated S3D video to the original size at the receiver. The basic approach for our interpolation is to exploit key-point correspondences between the stereoscopic left and right images. Since the rectified left and right frames of the S3D videos have no scale and geometric transformations between the two stereo images, a simple key-point detection method can be employed without considering the scale and transformation invariances. After detecting matched key-point pairs between the left and right images, we can interpolate the decimated pixels by exploiting the corresponding key-points in the opposite view as well as their neighboring pixels in the current view. The merit of our method is that no side information is to be sent to the receiver to assist the interpolation. Nevertheless, the proposed method yields similar or even better PSNR performance than the previous side information method. Moreover, it is better and faster than the conventional pixels-wised block based stereo matching algorithm (BMA). Especially, the proposed method with the top-bottom sub-sampling format outperforms more 2dB in term of PSNR and less 31 times in term of execution time than pixels-wised BMA.

Vietnam’s Renovation and its Impacts on Women

VU,THI KIM ANH 이화여자대학교 국제대학원 2009 국내석사

Vietnam has been praised for its great economic achievements contributed by renovation policy (or Doi Moi) introduced during the late 1990s. Due to the policy, many people have been benefiting from better social and economic opportunities. This research aims to explore the impact of Doi Moi on women lives in Vietnam. The findings suggest that Doi Moi has brought about a certain number of benefits in education, job opportunities and political participation. However, it also indicates that the economic changes have been negatively affecting their lives. This includes double burdens that they have to bear from work and at home. This means while having more chances to get involved in social activities, time they spend on doing house work is relatively higher than men do. Women are also being blamed for not taking care of the family as much as they did in the past. Besides, though having opportunities to participate in politic arena, the number of women hold key positions in social organizations remain quite modest. Aggressive female migration is also found as one of the consequence of uneven development made by economic renovation. The research concludes by offering some recommendations to tackle undesired impacts that Doi Moi has created. 90년도 말에 Doi moi 정책(Reform Policy)이 실시되었을 때부터 최근에 베트남은 경제적 성장을 크게 도달해왔다. 그 성과에 인하여 베트남 국민, 특히 베트남 여성은 좋은 교육과 경영의 환경을 받을 수 있는 것이다. 이런 경제 성장 과정에서 발생하고 있는 부작용하고 낳은 부정적 면을 가하고 있는 성을 위한 더 좋은 생활을 찾는 방법을 살펴보며 탐색하는 것은 이 논문의 주요 목적이다. 베트남 여성은 사화적 활동에 많이 참가할 수 있는 기회를 얻을 수 있는 반면에 가정 생활과 집안 일에 동시에 담당해야 하는 것이다. 또는 현재 주요 기관에서 중요한 역할을 하는 여성은 아직은 많지 않다는 것이 걱정할 만한 문제이다. 경제가 성장되는 과성과 동시에 직접적 이유든 간접적 이유든 가정 생활과 가정 관계, 그리고 가정 파경 비율이 늘어나는 데 그 중에 예전만큼 부족한 여성의 역할이기 때문이란 이유도 하나다. 한편으로는 여성의 이민 문제도 경제적 성장 과정에서 낳은 하나의 결과이다. 여성에 대한 정책들의 이런 부정적은 반영을 해결 방법 및 주용 대안을 살펴보며 찾고자 하는 것은 이 논문의 결론이다.

Three essays on trade and investment in Vietnam

Anh, Vu Diep 서강대학교 국제대학원 2013 국내박사

베트남인 학습자를 위한 한국어 한자어 학습 전략

Vu, Thi Ngoc Anh 부산대학교 2011 국내석사

Study of force different upon the biomolecule sample preparation for atomic force microscopy imaging

Vu Viet Anh 선문대학교 대학원 2007 국내석사

The bio-molecule imaging using Atomic Force Microscopy (AFM) has been interested. For AFM imaging in ambient environment, an existed monolayer of water cause the adhesion force lowered the image quality. This work investigated the methods to reduce it. The AFM cantilever tip surface were treated with 48% HF solution after the degreasing processes. The substrates of Si (100) wafer were investigated with two hydrophobize methods: 48% HF solution treatment and 3- Aminopropyletriethoxysilane (APTES). The adhesion force reductions were observed by Force-Distance curves imaging using an AFM. The quality improvement of biomolecule image after the investigation will be presented in this thesis.