• 디지털융복합연구
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• 제18권11호
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• pp.99-109
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• 2020

유료 멤버십은 지속적 거래를 통해 장기 고객을 확보할 수 있는 유용한 마케팅 방법이다. 본 연구는 국내 쇼핑 플랫폼 기업들이 신규로 유료 멤버십을 출시하거나, 운영중인 멤버십을 개선하고자 할 때 참고할 수 있도록, 해외의 대표적 멤버십인 Amazon Prime, Alibaba 88 멤버십, Rakuten Super Point를 벤치마킹하였다. 3가지 멤버십 서비스의 공통점은 경제적 이익, 편리한 경험, 차별적 대우 제공이었으며, 이커머스를 넘어서 소비 생활 전반을 장악한 거대 서비스 기업이 되었다는 점이 특징이었다. 국내 기업은 3가지 공통점 외에 소비자에게 전달하고자 하는 핵심 고객 가치를 정하고 장기적 관점에서 유료 멤버십이 운영될 수 있도록 혜택을 구성해야 할 것이다. 본 연구는 실무적 관점의 기여도가 높은 연구로, 추후 유료 멤버십 전문가 대상의 실증분석 및 고객 사용자 조사가 필요하다.

• Journal of Public Diplomacy
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• 제1권1호
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• pp.36-56
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• 2021

The Amazon fires in summer 2019 triggered an incendiary Twitter debate between French president Emmanuel Macron and Brazilian president Jair Bolsonaro that engaged political leaders, celebrities, and audiences worldwide. Currently, diplomats-in-chief connect to the global public through completely open debates, often without proper advice from foreign-affairs ministers, which may result in misunderstandings and conflicts among world leaders. Hence, this study argues that these interactions must be supported by Nicholas Cull's seven lessons in public diplomacy. The main topic on hand is presidential public diplomacy performed through digital means in cyberspace. Thus, after distinguishing cyberspace, digital diplomacy, and cyberdiplomacy, the literature review focuses on presidential public diplomacy, presidential diplomacy on Twitter, and Cull's seven lessons. Subsequently, the case study method provides a snapshot of the debate between Macron and Bolsonaro over the Amazon fires. This study concludes by answering the research question and indicating grist for the mill with regard to future developments.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 1999년도 Proceedings of International Symposium on Remote Sensing
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• pp.310-315
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• 1999

We extracted narrow open water streams from JERS-1 SAR images of the Amazon rain forest. The extracted range of these streams were almost comparable to a high level extraction of the same streams from near-IR images of JERS-1 VNIR data notwithstanding that these features in SAR images show the strong dependence of the observation angle. Large water bodies are relatively easy to extract from JERS-1 SAR images, as they tend to appear as very dark areas; but streams whose width is nearly equal to or less than the spatial resolution no longer appear as very dark features. By using strong scatterers distributed sparsely along the radar facing sides of the streams, we can successfully estimate approximate ranges of waterways and then extract relatively dark line-like features within these ranges.

• Fisheries and Aquatic Sciences
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• 제27권2호
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• pp.57-65
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• 2024

Paiche (Arapaima gigas), is a colossal freshwater fish native to the Amazon basin. Its geographic distribution spans various regions, including Brazil, Peru, Colombia, and Guyana, making it a significant component of the aquatic ecosystems in this area. Beyond its ecological role, the paiche holds substantial importance as a valuable fish resource for local communities, providing sustenance and economic opportunities. This review provides a comprehensive analysis of the reproductive aspects of the paiche, based on information published from January 2000 to January 2022. It encompasses a wide range of reproductive characteristics, including sexual differentiation, age at first maturity, and identification techniques. Additionally, it offers an evaluation of various mating behaviors, highlighting their respective advantages and disadvantages. The review also explores genetic and behavioral traits observed in both wild and captive specimens, offering valuable insights for the effective management of breeding programs.

• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2002년도 Proceedings of International Symposium on Remote Sensing
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• pp.454-459
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• 2002

We have developed a new method to visualize river networks in tropical rain forests from JERS-1 SAR images. This method compresses river information in an original SAR image to a small image displaying wide rivers as dark objects in real size and narrower rivers as bright objects showing brightness level as an indicator of the discharge. We applied this method to 476 images of Amazon forests, 13 observations for path 415 data and 11 observations for path 416 data between 1993 and 1997. We confirmed that a change observed in a preliminary experiment was certainly a part of seasonal changes. The changes roughly correspond to the monthly precipitation changes. Through a simple digital analysis although qualitative, we also detected subtle but consistent regional differences among minor tributaries that belong to a major tributary basin.

• 한국임상수의학회지
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• 제21권4호
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• pp.413-415
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• 2004

A male Blue-fronted amazon parrot suddenly died after having a history of depression, anorexia and emaciation. At necropsy, numerous well-demarcated yellow to white firm nodules were scattered throughout the left caudal lung lobes and adjacent air sac. Histologically, the wall of air sac was significantly thickened due to necrosis and infiltration of large numbers of fungi and degenerated heterophils. Multifocal necrotizing granulomatous lesions with numerous fungal hypae as well as vasculitis and thrombosis were found in tl1e lung. The fungi had conidiophore, vesicle, phialides and conidia which were characteristic of Aspergillus sp. This is tl1e first report of mycotic air sacculitis and pneumonitis caused by Aspergillus in a parrot in Korea.

• 한국IT서비스학회지
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• 제17권2호
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• pp.191-205
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• 2018

With the advancement of artificial intelligence (AI) techniques, many consumer products have adopted AI features for providing proactive and personalized services to customers. One of the most prominent products featuring AI techniques is a smart speaker. The fundamental of smart speaker is a portable wireless Internet connecting speaker which already have existed in a consumer market. By applying AI techniques, smart speakers can recognize human voices and communicate with them. In addition, they can control other connecting devices and provide offline services. The goal of this study is to identify the impact of AI techniques for customer rating to the products. We compared customer reviews of other portable speakers without AI features and those of a smart speaker. Amazon echo is used for a smart speaker and JBL Flip 4 Bluetooth Speaker and Ultimate Ears BOOM 2 Panther Limited Edition are used for the comparison. These products are in the same price range ($50~100) and selected as featured products in Amazon.com. All reviews for the products were collected and common words for all products and unique words of the smart speaker were identified. Information gain values were calculated to identify the influences of words to be rated as positive or negative. Positive and negative words in all the products or in Amazon echo were identified, too. Topic modeling was applied to the customer reviews on Amazon echo and the importance of each topic were measured by summating information gain values of each topic. This study provides a way of identifying customer responses on the AI feature and measuring the importance of the feature among diverse features of the products.

• Journal of Information Processing Systems
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• 제18권6호
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• pp.729-740
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• 2022

Netflix, Amazon Prime, and YouTube are the most popular and fastest-growing streaming services globally. It is a matter of great interest for the streaming service providers to preview their service infrastructure and streaming strategy in order to provide new streaming services. Hence, the first part of the paper presents a detailed survey of the Content Distribution Network (CDN) and cloud infrastructure of these service providers. To understand the streaming strategy of these service providers, the second part of the paper deduces a common quality-of-service (QoS) model based on rebuffering time, bitrate, progressive download ratio, and standard deviation of the On-Off cycle. This model is then used to analyze and compare the streaming behaviors of these services. This study concluded that the streaming behaviors of all these services are similar as they all use Dynamic Adaptive Streaming over HTTP (DASH) on top of TCP. However, the amount of data that they download in the buffering state and steady-state vary, resulting in different progressive download ratios, rebuffering levels, and bitrates. The characteristics of their On-Off cycle are also different resulting in different QoS. Hence a thorough adaptive bit rate (ABR) analysis is presented in this paper. The streaming behaviors of these services are tested on different access network bandwidths, ranging from 75 kbps to 30 Mbps. The survey results indicate that Netflix QoS and streaming behavior are significantly consistent followed by Amazon Prime and YouTube. Our approach can be used to compare and contrast the streaming services' strategies and finetune their ABR and flow control mechanisms.

• 대한원격탐사학회지
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• 제34권6_1호
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• pp.969-979
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• 2018

이 연구는 아마존 열대우림 지역에서 획득된 ALOS PALSAR 자료로부터 HH-편파 와 HV-편파 및 VV-편파와 VH-편파 간의 상관계수를 구하였으며, 이로부터 다중편파 SAR의 반사대칭(Reflection Symmetry) 가정에 대한 분석결과를 보고한다. 반사대칭 가정은 다중편파 SAR의 균질한 자연 산란체에서 HH-편파와 HV-편파 및 VV-편파와 VH-편파는 서로 완전 독립적이며 0의 상관계수를 갖는다는 것으로, 이는 다중편파 SAR의 필수적인 cross-talk 보정 계수 획득과정뿐만 아니라 다중편파 SAR 신호의 3-성분 분석법 등의 활용과정에서 흔히 적용되는 가정이다. 특히 아마존 열대우림 지역은 다중편파 SAR의 반사대칭성 보정에 대표적으로 활용되고 있는 국제적 기준분석 지역이다. 분석결과 가정과는 달리 반사대칭 쌍들 간의 상관계수는 0.018에서 0.097의 범위를 나타냈으며, 이는 동종편파와 이종편파 신호 간에 완전 독립적이지 못하며 무시할 수 없을 정도의 상관관계가 존재한다는 것을 지시하였다. 따라서 이와 같은 0이 아닌 상관계수는 향후 국내 다중편파 SAR 검 보정 계수 결정 및 SAR 다중편파 활용과정에서 오차로 작용할 수 있다는 점이 고려되어야 한다.

• 한국습지학회지
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• 제23권2호
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• pp.116-121
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• 2021

이 연구는 현재까지 국내 야생에서 확인되지 않았던 외래종 견목거북과(Podocnemididae) 아마존노란점거북(Yellow-spotted Amazon River Turtle, Podocnemis unifilis)을 처음으로 관찰한 사실을 학술적으로 보고하고자 한다. 2020년 7월 24일 제주특별자치도 제주시 조천읍 와흘리 33°30'20.08"N 126°38'0.23"E 지점에서 아마존노란점거북 2개체가 바위에서 일광욕하고 있는 것이 관찰되었다. 1개체는 머리에 노란색 반점이 있었고, 다른 1개체는 흑화되어 검은색을 띠었다. 관찰된 장소는 도로와 인접해 있고, 사람들의 출입이 잦은 곳으로, 애완용으로 사육되던 개체가 연못으로 방사된 것으로 추측된다. 최근 호수, 저수지 등 국내 야생에서 확인되는 외래거북이 증가하고 있으며, 외래거북 유입으로 인한 수생태계의 피해가 예상되는 만큼, 외래생물에 대한 시민과학 프로젝트와 환경교육을 통한 대중들의 인식 개선이 필요하다. 향후 발견된 개체에 대하여 지속적인 모니터링을 통한 야생 적응 여부, 번식과 관련된 추가 연구가 수행되어야 할 것이다.