• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제12권8호
• /
• pp.3856-3872
• /
• 2018

HTTP-based adaptive streaming (HAS) has recently been widely deployed on the Internet. In the HAS system, a video content is encoded at multiple bitrates and the encoded video content is segmented into small parts of fixed durations. The HAS client requests a video segment and stores it in the playout buffer. The rate adaptation algorithm employed in HAS clients dynamically determines the video bitrate depending on the time-varying bandwidth. Many studies have shown that an efficient rate adaptation algorithm is critical to ensuring quality-of-experience in HAS systems. However, existing algorithms have problems estimating the network bandwidth because bandwidth estimation is performed on the client-side application stack. Without the help of transport layer protocols, it is difficult to achieve accurate bandwidth estimation due to the inherent segment-based transmission of the HAS. In this paper, we propose an alternative approach that utilizes the playout buffer occupancy rather than using bandwidth estimates obtained from the application layer. We start with a queueing analysis of the playout buffer. Then, we present a buffer-aware rate adaptation algorithm that is solely based on the mean buffer occupancy. Our simulation results show that compared to conventional algorithms, the proposed algorithm achieves very smooth video quality while delivering a similar average video bitrate.

• 영어영문학
• /
• 제59권4호
• /
• pp.593-617
• /
• 2013

Tales from Shakespeare, written by Charles and Mary Lamb in 1807, is an adaptation of Shakespeare's plays which was intended for children. Shakespeare's poetic language is transmitted into prose, which enables children to easily read his works. Charles and Mary Lamb collaborated in adapting Shakespeare's plays, but they undertook separate duties which revealed different attitudes in their approach to the adaptation. This dissertation examines Mary Lamb's adaption of Shakespeare's problem play All's Well That Ends Well and Charles Lamb's adaption of Shakespeare' tragedy King Lear, with an adapted pattern focusing on the plot and character. Charles Lamb stressed the "imagination of a fairy tale," which was against the trend in children's literature of the time, while Mary Lamb stressed "the moral and didactic element." Mary Lamb was concerned with the education of female children in the early nineteenth-century. As a result, the Tales presents "a double movement" or perspective, which stresses didactic elements, as well as imagination. These ambivalent attitudes caused critical debates in the nineteenth-century. However, the Lambs defended criticism against "the double movement," suspecting themselves to be "no bigger than a child," from the viewpoint of "the imagination," and reading the Tales to be effective at "making a child a virtuous man," from the viewpoint of "an education."

• The Plant Pathology Journal
• /
• 제35권5호
• /
• pp.459-472
• /
• 2019

The increasing variation in climatic conditions under climate change directly influences plant-microbe interactions. To account for as many variables as possible that may play critical roles in such interactions, the use of an integrated modeling approach is necessary. Here, we report for the first time a local impact assessment and adaptation study of future epidemics of kiwifruit bacterial blossom blight (KBB) in Jeonnam province, Korea, using an integrated modeling approach. This study included a series of models that integrated both the phenological responses of kiwifruit and the epidemiological responses of KBB to climatic factors with a 1 km resolution, under the RCP8.5 climate change scenario. Our results indicate that the area suitable for kiwifruit cultivation in Jeonnam province will increase and that the flowering date of kiwifruit will occur increasingly earlier, mainly due to the warming climate. Future epidemics of KBB during the predicted flowering periods were estimated using the Pss-KBB Risk Model over the predicted suitable cultivation regions, and we found location-specific, periodic outbreaks of KBB in the province through 2100. Here, we further suggest a potential, scientifically-informed, long-term adaptation strategy using a cultivar of kiwifruit with a different maturity period to relieve the pressures of future KBB risk. Our results clearly show one of the possible options for a local impact assessment and adaptation study using multiple models in an integrated way.

• 한국정보처리학회:학술대회논문집
• /
• 한국정보처리학회 2007년도 춘계학술발표대회
• /
• pp.285-288
• /
• 2007

There is substantial evidence from earlier researches that older adults have difficult seeing under low illumination and at night, even in the absence of ocular diseases. During human aging, there is a rampant decrease in rod/cone-meditated adaptation which is caused by delayed rhodopsin regeneration and pigment depletion. This calls for a need to develop appropriate visual gadgets to effectively aid the aging generation. Our research culminates its approach from Pattanaik's model by making extensions to temporal visual filtering, thereby simulating a reduction of visual response which comes with age. Our filtering model paves way and lays a foundation for future research to develop a more effective adaptation model that may be further used in developing visual content adaptation aids and guidelines in MPEG 21 environment. We demonstrate our visual model using a High Dynamic Range image and the experiment results are in conversant with the psychophysical data from previous vision researches.

• Asian-Australasian Journal of Animal Sciences
• /
• 제31권3호
• /
• pp.395-402
• /
• 2018

Objective: An experiment was conducted to evaluate effects of inclusion level of palm kernel meal (PKM) and adaptation duration on the digestible energy (DE) and apparent total tract digestibility (ATTD) of chemical constituents in diets fed to growing-finishing pigs. Methods: Thirty crossbred barrows ($Duroc{\times}Landrace{\times}Large\;White$) with an average initial body weight of $85.0{\pm}2.1kg$ were fed 5 diets in a completely randomized design. The diets included a corn-soybean meal basal diet and 4 additional diets in which corn and soybean meal were partly replaced by 10%, 20%, 30%, or 40% PKM. After 7 d of adaptation to the experimental diets, feces were collected from d 8 to 12, d 15 to 19, d 22 to 26, and d 29 to 33, respectively. Results: The DE and ATTD of gross energy (GE), dry matter (DM), ash, organic matter (OM), neutral detergent fiber (NDF), acid detergent fiber (ADF), and crude protein (CP) in diets decreased linearly as the dietary PKM increased within each adaptation duration (p<0.01). Diet containing 19.5% PKM had less DE value and ATTD of all detected items compared with other diets when fed to pigs for 14 days (p<0.05). The ATTD of CP in PKM calculated by 19.5% and 39.0% linearly increased as adaptation duration prolonged from 7 to 28 days (p<0 .01). Conclusion: Inclusion level of PKM and adaptation duration had an interactive effect on DE and the ATTD of GE, DM, OM, and CP (p<0.01 or 0.05) but ash, NDF, and ADF in diet (p>0.05). Considering a stable determination, 21 days of adaptation to a diet containing 19.5% PKM is needed in pigs and a longer adaptation time is recommended as dietary PKM increases.

• 한국음향학회지
• /
• 제22권8호
• /
• pp.727-739
• /
• 2003

본 논문에서는 HM-Net (Hidden Markov Network)을 다양한 태스크에의 적용과 화자의 특성을 효과적으로 나타내기 위해 HM-Net 음성인식 시스템에 MLLR (Maximum Likelihood Linear Regression) 적응방법을 도입하였으며, HM-Net 학습 알고리즘을 개량하여 회귀클래스 생성방법을 제안한다. 제안방법은 PDT-SSS (Phonetic Decision Tree-based Successive State Splitting)알고리즘의 문맥방향 상태분할에 의한 상태레벨 공유를 이용한 방법이다. 즉, 문맥방향의 각 상태에 적응화자 음성데이터에 포함된 문맥정보를 분할하여 적응화될 음소환경을 결정하는 것이다. 따라서 제안방법은 새로운 화자로부터 문맥정보와 적응화 데이터의 발성 양에 의존하여 결정된 많은 적응 파라미터들을 (평균, 분산) 자유롭게 제어할 수 있게 된다. 제안방법의 유효성을 확인하기 위해 국어공학센터 (KLE) 452 데이터와 항공편 예약관련 (YNU200) 연속음성을 대상으로 인식실험을 수행한 결과, 음소인식, 단어인식, 연속음성인식에 대해서, 평균 34∼37%, 평균 9%, 평균 20%의 성능 향상을 각각 보였다. 또한 적응화 데이터의 양에 따른 인식성능 비교에서 제안방법을 적용한 인식 시스템이 적응 데이터의 양이 적은 경우에도 향상된 인식률을 보여 MLLR 적응방법의 특성을 만족하였다. 따라서 MLLR 적응방법을 도입한 HM-Net 음성인식 시스템에 제안한 회귀클래스 생성방법이 유효함을 확인할 수 있었다.

• 대한치과의사협회지
• /
• 제57권12호
• /
• pp.747-756
• /
• 2019

This paper reviews the adaptation accuracy and mechanical properties of currently used denture processing systems with base resin materials and introduces the latest research on the development of antimicrobial denture base resins. Poly(methyl methacrylate) has been successfully used as a dental denture base resin material by the compress-molding method and heat polymerization for a long time, but recently, new processing techniques, injection molding-methods or fluid-resin technique are also used for fabricating denture base. However, studies indicated that there was no difference between the injectionmolding and the conventional compression-molding method in terms of adaption accuracy of denture base. The fluid-resin fabrication and one injection-molding systems exhibited better adaptation accuracy than the other processing methods. Resin denture bases in the oral cavity may undergo midline fractures due to flexural fatigue from repeated masticatory loading. For those patients, impact resistant denture base resins are recommended to prevent denture fracture during service. Thermoplastic denture base resins can be helpful for patients suffering from allergic reaction to resin monomers with a soft-fit, however, thermoplastic resins with low stiffness can irritate gum tissues and accelerate abnormal alveolar ridge resorption. Moreover, due to low chemical durability in oral cavity, those should be used for a limited period of time.

• Structural Engineering and Mechanics
• /
• 제44권3호
• /
• pp.379-403
• /
• 2012

In recent years, the need for optimal design of structures under time-history loading aroused great attention in researchers. The main problem in this field is the extremely high computational demand of time-history analyses, which may convert the solution algorithm to an illogical one. In this paper, a new framework is developed to solve the size optimization problem of steel truss structures subjected to ground motions. In order to solve this problem, the covariance matrix adaptation evolution strategy algorithm is employed for the optimization procedure, while a generalized regression neural network is utilized as a meta-model for fitness approximation. Moreover, the computational cost of time-history analysis is decreased through a wavelet analysis. Capability and efficiency of the proposed framework is investigated via two design examples, comprising of a tower truss and a footbridge truss.

• 한국자원식물학회지
• /
• 제21권3호
• /
• pp.210-215
• /
• 2008

Gene-expression analysis is increasingly important in biological research, with real-time reverse PCR (RTPCR) becoming the method of choice for high-throughput and accurate expression profiling of selected genes. However, this technique requires important preliminary work for standardizing and optimizing the many parameters involved in the analysis. Plant stress studies are more and more based on gene expression. The analysis of gene expression requires sensitive and reproducible measurements for specific mRNA sequence. Several genes are regulated in response to abitoic stresses, such as salinity, and their gene products function in stress response and tolerance. The design of the primers and TaqMan probes for real-time PCR assays were carried out using the Primer $Express^{TM}$ software 3.0. The PCR efficiency was estimated through the linear regression of the dilution curve. To understand the expression pattern of various genes under salt stressed condition, we have developed a unique public resource of 9 stress-related genes in poplar. In this study, real-time RT-PCR was used to quantify the transcript level of 10 genes (9 stress-related genes and 1 house keeping gene) that could play a role in adaptation of Populus davidiana. Real-time RT-PCR analyses exhibited different expression ratios of related genes. The data obtained showed that determination of mRNA levels could constitute a new approach to study the stress response of P. davidiana after adaptation during growth in salinity condition.

• 한국심리학회지 : 문화 및 사회문제
• /
• 제26권4호
• /
• pp.379-407
• /
• 2020

본 연구는 우리나라 대기업 중년 남성 임원들의 비자발적 퇴직 이후 성공적인 적응을 위한 심리적·사회적 요인들을 알아보았다. 이를 위하여 퇴직 임원 13명(남성, 평균 58.2세)을 대상으로 퇴직 이후 시간의 경과에 따른 변화 경험과 이에 대한 평가나 해석에 대해 심층면담하고 그 내용을 현상학적 방법으로 분석하였다. 그 결과, '경제적 준비'와 '배우자 지원'이 적응 선행요건이었다. 적응 과정에서 출발점은 '현실 수용'으로, 과거 삶의 재평가, 다양한 변화들을 인정하고 과거에서 탈피, 평범한 50대 퇴직자로서 자신의 모습을 수용, 불안과의 동거, 적절한 시간의 필요 등의 하위요소로 구성되었다. 그 다음 이들은 인지적·정서적 재평가와 삶의 가치를 재정비하고, 일의 의미와 목표를 재구성하면서 미래를 설계했으며, 새로 선택한 활동들을 중심으로 '심리적 재구조화'와 '자아정체성'을 재정립했다. 이들의 퇴직과 퇴직 후 적응은 심리적·사회적 자본이 충족되었던 임원 재직 경험에 대한 대립과정이자, 이로 인한 부적응적 대처 양상에 대한 스토리이며, 이후 인지·정서·행동 차원에서 이러한 부조화를 극복해가는 일련의 과정에 대한 서사였다. 본 연구결과는 기업이나 국가 그리고 퇴직자에게 퇴직에 대한 대처와 관련하여 시사점을 제공한다.