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Very simple circularly polarised printed patch antenna with enhanced bandwidth
Le, T. T.,Park, H. C. IET 2014 Electronics letters Vol.50 No.25
<P>A very simple circularly polarised (CP) printed patch antenna with enhanced bandwidth has been designed, fabricated and tested. The antenna consists of two semi-circular patches and a rectangular ground plane, and is excited by a simple microstrip feedline. The total substrate size is 50 × 50 × 1.52 mm<SUP>3</SUP>. The measured -10 dB impedance bandwidth is 101% (2.84-8.7 GHz) and the measured 3 dB axial-ratio (AR) bandwidth is 49.8% (3.95-6.57 GHz). Good agreement is achieved between measured and simulated results.</P>
DANIEL LETTS(다니엘 레츠) 한국디자인산업연구센터 2011 IDCC Proceeding Vol.2011 No.11
서비스 제공의 전통적인 모델은 소비자들을 필요악으로 바라보는 포스트산업적 관점에서 만들어졌다. 그러나 서비스 디자인은 정보사회가 가져온, 사용자들이 과정에 참여함으로써 진정한 가치를 창출하는 기회를 제공하고 있다. 우리는 이렇게 모든 집단에게 서비스가 새로운 가치를 만들어내는 플랫폼 모델을 ‘서비스 형평성 Service Equity™’라 칭했다. 본 강의는 서비스 제공부터 서비스 지원까지, 서비스 매니지먼트를 통해, 그리고 서비스 평형과 서비스 가치까지를 보여주는, 이 분야에 대한 live | work의 접근과 사고를 설명한다. 실제 사례들과 본사 고유의 케이스 스터디들을 통해, 왜 서비스 유저들이 동등한 파트너로 취급되는 서비스와 상호작용하기를 더욱 선호하게 될지, 그리고 왜 비즈니스에서는 이런 변화를 받아들여야 하며, 만약 받아들이지 않으면 미래에 낙후되는 위험을 갖게 되는지를 설명해준다. Traditional models of service delivery are created from a post industrial perspective that treats consumers as a necessary evil. However, Service Design embraces the opportunities presented by an information society to create services of real value to the participants in the process. We call this model Service EquityTM - where service becomes a platform to create new value that is of benefit to all parties. This lecture describes live|work’s approach and thinking in this area showing the spectrum of service provision from Service Support, through Service Management, and Service Equilibrium, to Service Equity. Real-world examples and some of live|work’s own case studies will be used to demonstrate why users of services will increasingly prefer to only interact with services where they are equal partners, and why businesses will need to adapt to this change or risk being left behind in the future.
A Practical Path Planner for the Robotic Vacuum Cleaner in Rectilinear Environments
Nakju Lett Doh,Chanki Kim,Wan Kyun Chung IEEE 2007 IEEE transactions on consumer electronics Vol.53 No.2
<P>In this paper, we propose a path planner for a robotic vacuum cleaner (RVC). In the design of the planner, we consider two main issues: (1) human-friendly path generation and (2) low computational load. First, we analyze how human move and suggest a hypothesis that human navigate in a way that minimizes the sum of muscle and brain energy. By imitating the human path, we propose a human- friendly path planner. Also, the designed planner requires a low amount of computations which not only extends the battery running time but also decreases the hardware cost of the RVC. Experimental results show that the proposed path gives a more favorable impression to customers than conventional paths.</P>
Particle filter-assisted ad hoc routing in a multi-hop wireless ad hoc network for multi-robots
Doh, Nak-Ju Lett,Nam, Chang-Joo,Lee, Suk-Kyu,Kim, Hwang-Nam Institute of Korean Electrical and Electronics Eng 2010 전기전자학회논문지 Vol.14 No.4
We describe in this paper how to facilitate ad hoc routing with a particle filter in a hostile radio environment for multi-hop wireless ad hoc networks that connect multi-robots. The proposed scheme increases a connection's throughput by exploiting alternative links without going through the procedure of route discovery when link failure happens among multi-robots' networking. The scheme is implemented by using a particle filter to find strongly connected nodes. The filter estimates the probability distribution function in a sample-based manner with N particles. The particles are associated with a weight which represents the probability of the corresponding node to be the node with the best link. At every step of the estimation, the weights of particles are calculated and particles are resampled based on the weights. Since a node with the strongest link status possesses the largest number of particles, we take this node to forward the packets.
A robust localization algorithm in topological maps with dynamic noises
Lee, Kyungmin,Doh, Nakju Lett,Chung, Wan Kyun,Lee, Seoung Kyou,Nam, Sang-Yep Emerald Group Publishing Limited 2008 The Industrial robot Vol.35 No.5
<B>Purpose</B> - The paper's purpose is to propose a localization algorithm for topological maps constituted by nodes and edges in a graph form. The focus is to develop a robust localization algorithm that works well even under various dynamic noises. <B>Design/methodology/approach</B> - For robust localization, the authors propose an algorithm which utilizes all available data such as node information, sensor measurements at the current time step (which are used in previous algorithms) and edge information, and sensor measurements at previous time steps (which have not been considered in other papers). Also, the algorithm estimates a robot's location in a multi-modal manner which increases its robustness. <B>Findings</B> - Findings show that the proposed algorithm works well in topological maps with various dynamics which are induced by the moving objects in the map and measurement noises from cheap sensors. <B>Originality/value</B> - Unlike previous approaches, the proposed algorithm has three key features: usage of edge data, inclusion of history information, and a multi-modal based approach. By virtue of these features, the paper develops an algorithm that enables robust localization performance.
The Method to use Native Code(C/C++) in Android OS and Its Applications
안상민,이건용,정운형,Nakju Lett Doh 한국지식정보기술학회 2015 한국지식정보기술학회 논문지 Vol.10 No.3
In general an Android application based on Java operates on DALVIK virtual machine. It is safe that an application operates on a virtual machine which means it is platform-independent. However, to be operated on a virtual machine, it takes some time for the program codes to be converted. This is slower than an operation of native codes like C because the codes are translated to machine language, which means it is platform-dependent. Also, it is restricted to access a hardware directly on a virtual machine. Many programs have been developed based on C/C++. We might save time and cost for development if we can reuse these programs without re-developing for other programming languages. On this paper, we explain how to operate a code based on C/C++ using JNI (Java Native Interface). Starting with how to call C/C++ native functions from Java classes, we introduce how codes developed with two different programming languages communicate each other. Also, we introduce a specific case using native codes on Android as an example.