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PMIPv6 빠른 핸드오버에서의 Out-of-Order 패킷 분석
( Anh Khuong Quoc ),손민한 ( Min Han Shon ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2013 한국정보처리학회 학술대회논문집 Vol.20 No.2
Fast Handover for Proxy Mobile IPv6 (FPMIPv6), a protocol described in RFC 5949, is used to reduce handover latency and minimize packet loss problem occuring in the Proxy Mobile IPv6 (PMIPv6) protocol. However, during the study of implementing FPMIPv6, we found the Out-of-Order Packet (OoOP) problem that occurs in the experiment of FPMIPv6. Since the OoOP is an issue that affects significantly to QoS of the network, in this paper, we analyze the OoOP problem by using network model. The analysis conducts the cause of occurring OoOP problem due to there exist two paths for data transmitted from Correspondent Node (CN) to MN in FPMIPv6.
Proxy Mobile IPv6에 대한 라우트 최적화에서 불규칙 패킷을 다루기 위한 기법
( Anh Khuong ),염상길 ( Sanggil Yeoum ),김동수 ( Dongsoo Kim ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2014 한국정보처리학회 학술대회논문집 Vol.21 No.1
Out-of-Order Packet (O<sup>3</sup>P) problem is an issue that significantly impacts to the QoS of service and network. Route optimization (RO) in PMIPv6 is proposed by P.Loureiro and M. Liebsch to reduce the load of LMAs and transmission delay. In RO scheme, at the time the optimal path is established, there exist two paths: optimal path and old path as non-optimal path for transmitting data between MN1 and MN2 that is the cause of O<sup>3</sup>P occurring. This paper proposes a scheme to prevent O<sup>3</sup>P problem by using packet buffering technique and a new mobility message, named End Traffic Marker (ETM) to mark the end of packet delivery through the old path.
Bank Credit, Trade Credit and Growth of Listed Agricultural Firms in Vietnam
Ninh Khuong LE,Anh Tuan BUI,Tu Anh PHAN 한국유통과학회 2020 The Journal of Asian Finance, Economics and Busine Vol.7 No.11
This paper investigates the relationships between bank credit and trade credit with profit of 130 agricultural firms listed on Vietnam’s stock exchanges during the period 2008-2014. Using the GMM approach, the paper reveals inverted-U shaped (∩) relationships between bank credit and trade credit with profit. Specifically, the optimal threshold of bank credit and trade credit to total assets of the firms are 0.4173 and 0.2425, respectively. The findings mean that if the ratio of bank credit to total assets exceeds the benchmark of 0.4173, firms should consider restructuring debts to get them back to the benchmark. To do so, firms should withdraw from those business fields that are not of their profession, in addition to liquiditizing unused assets to repay debts and not using short-term credit to invest in long-term projects. Firms may use trade credit wisely when other sources of finance are lacking. In concrete terms, firms can increase trade credit use if the ratio of trade credit to total assets is below 0.2425. Yet, if this ratio goes beyond this benchmark, firms should get back to this benchmark, e.g., keeping a suitable amount of inventory. The implications of this study is to boost firm growth in the proposed way.
Synthesis and Electrocatalytic Application of Palladium Alloys Deposited on Tin Doped Indium Oxide
( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Tin doped indium oxide (ITO) nanoparticles are known as promising noncarbon supports for the oxygen reduction reaction (ORR) in proton exchange membrane fuel cells (PEMFC). This is mainly because of the high electrical conductivity of indium oxide and beneficial electronic interactions between deposited platinum nanoparticles and tin oxide. In addition, there have also been considerable interest in employing palladium (Pd) alloys as a substitute for Pt catalyst because their performance is quite competitive with expensive Pt catalyst. However, in previous studies, either the catalyst was changed or the support was replaced. In this work, we report a synthetic procedure for depositing Pd alloys on ITO support and its electrocatalytical properties. Interestingly, in comparison to the traditional catalyst for PEMFC, both the catalyst and the support were replaced and investigated simultaneously.
( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Rational design of molecular platforms with structural hiearachy and complexity based on the coordination-driven multilevel assembly of each fundamental units is of considerable interest. Notably, discrete molecular cages could be developed from well-organized secondary supramolecules through tertiary assembly process. In this work, a variety of tertiary discrete molecular cages with distinct functionalities resulting from the hierarchical arrangement of triple-stranded supramolecular helicates is reported. The discrete molecular cages show significantly enhanced CO<sub>2</sub> adsoprtion properties in comparison with separate triple-stranded helicates.
Integration of Magnetism and Fluorescence within Iron Oxide-Silica Core-Shell Nanohybrids
( Nguyen Quoc Khuong Anh ),( Maiduyhien ),유효종 한국공업화학회 2019 한국공업화학회 연구논문 초록집 Vol.2019 No.0
Iron oxide-silica core-shell (Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>) nanohybrids are successfully prepared via both Stöber and reverse microemulsion (water-in-oil) approach using sodium oleate as a stabilizing agent. In addition, the formation of highly fluorescent, multiple Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub> (FL multi-Fe<sub>3</sub>O<sub>4</sub>@SiO<sub>2</sub>) by functionalizing organic (fluorescein) and inorganic (Rubpy) dyes through the sequential hydrolysis and condensation process of tetraethylorthosilicate (TEOS) and 3-(aminopropyl) triethoxysilane (APTES) is also reported. These synthetic procedure can be relevant to the fabrication of differently intriguing nanomaterials with a wide range of application.
Novel Reward Function for Autonomous Drone Navigating in Indoor Environment
( Khuong G. T. Diep ),( Viet-tuan Le ),( Tae-seok Kim ),( Anh H. Vo ),( Yong-guk Kim ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
Unmanned aerial vehicles are gaining in popularity with the development of science and technology, and are being used for a wide range of purposes, including surveillance, rescue, delivery of goods, and data collection. In particular, the ability to avoid obstacles during navigation without human oversight is one of the essential capabilities that a drone must possess. Many works currently have solved this problem by implementing deep reinforcement learning (DRL) model. The essential core of a DRL model is reward function. Therefore, this paper proposes a new reward function with appropriate action space and employs dueling double deep Q-Networks to train a drone to navigate in indoor environment without collision.
Credit Rationing and Trade Credit Use by Farmers in Vietnam
Ninh Khuong LE,Tu Anh PHAN,Hon Van CAO 한국유통과학회 2021 The Journal of Asian Finance, Economics and Busine Vol.8 No.4
The purpose of this paper is to estimate the impact of credit rationing on the amount of trade credit used by farmers in Vietnam. This study employs a survey data collected through direct interviews with heads of 1,065 rice households randomly selected out of provinces and city in the Mekong River Delta (MRD). In each province or city, the village with the largest area of land devoted to rice production from the district with the largest area of land devoted to rice production was picked up for survey. In each village, 200 rice farmers were randomly chosen for interview. Based on a probit model and a semi-parametric propensity score matching (PSM) estimator while controlling sociodemographic traits of rice farmers, the estimated results show that non-credit rationed farmers use less trade credit to finance production compared to their credit rationed counterparts. Moreover, the amount of trade credit used by farmers decreases as the degree of credit rationing drops. This paper provides evidence of the substitutive relationship between bank credit and trade credit. It also implicitly suggests that banks can drive trade creditors out of the market if they manage to solve the problem of information asymmetry and transaction cost.
OAI PMIPv6를 이용한 FPMIPv6 테스트베드의 구현 및 분석
도미솔 ( Misol Do ),( Khuong Quoc Anh ),박창용 ( Changyong Park ),손민한 ( Minhan Shon ),추현승 ( Hyunseung Choo ) 한국정보처리학회 2012 한국정보처리학회 학술대회논문집 Vol.19 No.2
PMIPv6 (Proxy Mobile IPv6)는 네트워크 기반 이동성 지원 프로토콜로 MN (Mobile Node)의 이동성 프로토콜 스택 유무와 관계없이 MN의 이동성을 지원한다. 하지만 핸드오버 과정에서 이동성 관련 시그널링을 완료할 때까지 지연이 발생하고 핸드오버 동안 MN으로 향하는 패킷이 손실된다는 단점을 갖고 있다. 이러한 단점을 보완하기 위한 기법으로 FPMIPv6 (Fast Handover for PMIPv6)가 제안되었다. 본 논문에서는 PMIPv6의 오픈소스인 OAI PMIPv6 (OpenAirInterface PMIPv6)를 기반으로 FPMIPv6 테스트베드를 구축하고 MN의 핸드오버를 실험하여 실제 FPMIPv6 환경에서의 핸드오버 지연 및 패킷손실 정도를 측정한다.
김태석 ( Tae-seok Kim ),( Anh H. Vo ),( Marvin John Ignacio ),( Khuong G. T. Diep ),김용국 ( Yong-guk Kim ) 한국정보처리학회 2023 한국정보처리학회 학술대회논문집 Vol.30 No.2
본 논문은 다양한 종류의 생성형 AI 용도의 UI/UX 중 텍스트 기반 UI/UX, 이미지 기반 UI/UX, 오디오 기반 UI/UX, 그리고 Multi-modal 을 기반으로 둔 UI/UX 와 같은 다양한 유형의 UI/UX 를 살펴보고 최신 기술을 활용한 미래전망에 대해 알아 보도록 한다. 현재 생성 모델은 다양한 산업분야에서 광범위하고 다양한 응용 프로그램으로 사용되고 있으며, 최근 연구자와 실무자들로부터 상당한 관심을 받고 있다. 생성형 AI 용도의 UI/UX 를 사용하면 생활에 편리해지며 시간과 돈이 매우 절약이 된다. 특히 사용자들이 편안하게 사용할 수 있는 생성형 AI 의 UI/UX 대한 연구방향에 대해 알아 보도록 한다.