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Narrowband Listen-Before-Talk under Coexistence with Wideband Systems in Unlicensed Spectrum
Wisnu Murti(무르티위스누),Ji-Hoon Yun(윤지훈) 한국전기전자학회 2019 전기전자학회논문지 Vol.23 No.1
3GPP LTE의 비면허대역 솔루션인 Licensed Assisted Access (LAA) 기술은 Listen-Before-Talk (LBT)을 수행한다. 이는 Wi-Fi와의 공존을 위해 Wi-Fi의 백오프 기법과 매우 유사하게 설계되었다. 하지만, Wi-Fi의 백오프 기법은 기존 장치와의 호환 및 공존을 위해 오래된 설계에 기반하고 있어, LAA의 LBT 또한 스펙트럼 이용에 있어 비효율성을 보인다. 만약 근처에 Wi-Fi 시스템이 없는 환경이라면 LAA는 보다 효율적인 LBT를 수행할 수 있다. 이 논문은 협대역 전송을 위한 Narrowband Clear Channel Assessment (NCCA)를 제안한다. NCCA에서 LAA 기지국은 광대역 또는 각 협대역 밴드에서 LBT를 수행한다. 이를 통해, 복수의 LAA 노드가 서로 다른 협대역에서 동시에 전송할 수 있게 한다. NCCA 구현을 위해 네 가지의 설계안을 제시하고, 성능 예측을 위한 수학 모델을 제시한다. 기존 광대역 시스템과 공존하는 시나리오에서 시뮬레이션을 통해 NCCA의 공존 성능과 제시한 성능 모델의 정확성을 보인다. LTE’s extension for unlicensed spectrum called Licensed Assisted Access (LAA) is equipped with Listen-Before-Talk (LBT) designed similar with the backoff mechanism of Wi-Fi for coexistence. However, Wi-Fi’s backoff mechanism has not evolved from its old design for compatibility with legacy devices, thus LAA’s LBT is not efficient either in utilizing spectrum. If LAA operates with no Wi-Fi systems in proximity, it can run more efficient LBT. In this paper, we propose Narrowband Clear Channel Assessment (NCCA) for narrowband transmission. In NCCA, an LAA node performs LBT in either wide or each narrow bandwidth segment. This allows multiple LAA nodes to perform simultaneous transmissions in orthogonal bandwidth segments in the same time slot. We design four variants of NCCA implementation and model their performance using a mathematical model. The coexistence performance of NCCA with conventional wideband nodes and the accuracy of the model are shown via simulation.
Wisnu Murti Suryaningrat,Jacky Mussry 글로벌지식마케팅경영학회 2018 Global Marketing Conference Vol.2018 No.07
Pamperpop is a new online platform based in Indonesia that connects beauty and personal care service providers to the end customers. The business idea was triggered by Zomato, an online platform for restaurant search and discovery service. There are some competitors in the market who provides services alike Pamperpop, but they are all new players who still building their customer base. This condition puts Pamperpop in a fierce competition and forces the company to be innovative in penetrating the market. Considering the nature of this business, there are two markets to be penetrated by the company. First market is the service providers who will become the tenant, and second market is the end customers who will become the user. Pamperpop has done some marketing activities to enter both markets; however the results were far from expectation. The acquisition rate did not meet target from management. Pamperpop really need to revisit their marketing strategy in order to stay competitive in the market. This article describes the analysis on the business issues faced by Pamperpop especially problems in the market penetration. Author identified the root issues by using Porter’s 5 Forces, Business Model Canvas, S-T-P analysis, and Marketing Mix. Authors found that management focus on the product development rather than identifying customer needs when building this business. This created some gaps in the marketing strategy to penetrate the market. The New Wave Marketing framework is chosen to formulate the new marketing strategy since it is suitable for technology and internet based business model that has horizontal communication in nature. The New Wave Marketing approach refines the existing business model to introduce clear positioning and strong differentiation in the market. The solution’s set aims to achieve Low Budget and High Impact marketing techniques with the combination of Above-The-Line and Below-The-Line approach.
Wisnu S. Soenarso,Dadan Nugraha,Eryda Listyaningrum 세계과학도시연합 2013 World Technopolis Review Vol.2 No.1
Science and Technology Park (STP) is perceived to be a vehicle in promoting innovation-based economic growth within the framework of regional and national innovation systems. STP is a tool to encourage regional innovation and competitiveness in increasing contribution of science and technology in economic development. STP can also be a leading sector in creating conducive environment for local community’s technopreneurship. In relation to the vision outlined in the 2025 Indonesian Master Plan of Acceleration and Expansion of Indonesia’s Economic (MP3EI), STP is stated to be an important element in creating innovation within the framework of Special Economic Zone among six Economic Corridors. Hence, the government of Indonesia continues to encourage the development of STPs in Indonesia by involving local governments, universities, business players and stakeholders surround the area. Ultimately, STP is a platform in developing National Innovation System (NIS) and Regional Innovation System (RIS).
Hadmojo, Wisnu Tantyo,Wibowo, Febrian Tri Adhi,Ryu, Du Yeol,Jung, In Hwan,Jang, Sung-Yeon American Chemical Society 2017 ACS APPLIED MATERIALS & INTERFACES Vol.9 No.38
<P>Although the combination of wide band gap polymer donors and narrow band gap small-molecule acceptors achieved state-of-the-art performance as bulk heterojunction (BHJ) active layers for organic solar cells, there have been only several of the wide band gap polymers that actually realized high-efficiency devices over >10%. Herein, we developed high-efficiency, low-energy-loss fullerene-free organic solar cells using a weakly crystalline wide band gap polymer donor, PBDTTPD-HT, and a nonfullerene small-molecule acceptor, ITIC. The excessive intermolecular stacking of ITIC is efficiently suppressed by the miscibility with PBDTTPD-HT, which led to a well-balanced nanomorphology in the PBDTTPD-HT/ITIG BHJ active films. The favorable optical; electronic, and energetic properties of PBDTTPD-HT with respect to ITIC achieved panchromatic photon-to-current conversion with a remarkably low energy loss (0.59 eV).</P>
Soenarso, Wisnu S.,Nugraha, Dadan,Listyaningrum, Eryda World Technopolis Association 2013 World Technopolis Review Vol.2 No.1
Science and Technology Park (STP) is perceived to be a vehicle in promoting innovation-based economic growth within the framework of regional and national innovation systems. STP is a tool to encourage regional innovation and competitiveness in increasing contribution of science and technology in economic development. STP can also be a leading sector in creating conducive environment for local community's technopreneurship. In relation to the vision outlined in the 2025 Indonesian Master Plan of Acceleration and Expansion of Indonesia's Economic (MP3EI), STP is stated to be an important element in creating innovation within the framework of Special Economic Zone among six Economic Corridors. Hence, the government of Indonesia continues to encourage the development of STPs in Indonesia by involving local governments, universities, business players and stakeholders surround the area. Ultimately, STP is a platform in developing National Innovation System (NIS) and Regional Innovation System (RIS).