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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal DOI :
Electronics and Telecommunications Research Institute
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Volume & Issues
Volume 34, Issue 6 - Dec 2012
Volume 34, Issue 5 - Oct 2012
Volume 34, Issue 4 - Aug 2012
Volume 34, Issue 3 - Jun 2012
Volume 34, Issue 2 - Apr 2012
Volume 34, Issue 1 - Feb 2012
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Transmission Performance Comparison of Direction Detection-Based 100-Gb/s Modulation Formats for Metro Area Optical Networks
Chung, Hwan Seok ; Chang, Sun Hyok ; Lee, Jonghyun ; Kim, Kwangjoon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 800~806
DOI : 10.4218/etrij.12.1812.0109
Transmission performances of direct detection-based 100-Gb/s modulation formats are investigated and compared for metro area optical networks. The effects of optical signal-to-noise ratio sensitivity, chromatic dispersion, cross-channel nonlinearity, and transmission distance on the performance of differential 8-ary phase-shift keying (D8PSK), differential phase-shift keying plus three-level amplitude-shift keying (DPSK+3ASK), and dual-carrier differential quaternary phase-shift keying (DC-DQPSK) are evaluated. The performance of coherent dual-polarization quadrature phase-shift keying (DP-QPSK) with block phase estimation and coherent DP-QPSK with digital differential detection are also presented for reference. According to our analysis, all three direct detection modulation formats could transmit a 100-Gb/s signal over several hundred kilometers of a single-mode fiber link. The results also show that DC-DQPSK outperforms D8PSK and DPSK+3ASK, and the performance of DC-DQPSK is comparable to that of coherent DP-QPSK with digital differential detection. The maximum transmission distance of DC-DQPSK is over 1,000 km, which is enough distance for metro applications.
An Energy Saving Scheme for Multilane-Based High-Speed Ethernet
Han, Kyeong-Eun ; Yang, Choong-Reol ; Kim, Kwangjoon ; Kim, Sun-Me ; Lee, Jonghyun ;
ETRI Journal, volume 34, issue 6, 2012, Pages 807~815
DOI : 10.4218/etrij.12.1812.0110
In this paper, we propose a scheme for partially dynamic lane control for energy saving in multilane-based high-speed Ethernet. In this scheme, among the given transmission lanes, at least one lane is always operating, and the remaining lanes are dynamically activated to alleviate the network performance in terms of queuing delay and packet loss in the range of acceptance. The number of active lanes is determined by the decision algorithm based on the information regarding traffic and queue status. The reconciliation sublayer adjusts the transmission lane with the updated number of lanes received from the algorithm, which guarantees no processing delay in the media access control layer, no overhead, and minimal delay of the exchanging control frames. The proposed scheme is simulated in terms of queuing delay, packet loss rate, lane changes, and energy saving using an OPNET simulator. Our results indicate that energy savings of around 55% (or, when the offered load is less than 0.25, a significant additional savings of up to 75%) can be obtained with a queuing delay of less than 1 ms, a packet loss of less than
, and a control packet exchange time of less than
in random traffic.
Faultless Protection Methods in Self-Healing Ethernet Ring Networks
Lee, Kwang-Koog ; Ryoo, Jeong-Dong ; Joo, Bheom Soon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 816~826
DOI : 10.4218/etrij.12.1812.0102
Self-healing Ethernet rings show promise for realizing the SONET/SDH-grade resilience in Carrier Ethernet infrastructures. However, when a ring is faulty, high-priority protection messages are processed in less time than low-priority data frames are processed. In this situation, any delayed data frames either being queued or traveling through long ring spans will cause the ring nodes to generate incorrect forwarding information. As a result, the data frames spread in the wrong direction, causing the ring to become unstable. To solve this problem, we propose four schemes, that is, dual flush, flush delay timer setting, purge triggering, and priority setting, and evaluate their protection performance under various traffic conditions on a ring based on the Ethernet ring protection (ERP) method. In addition, we develop an absorbing Markov chain model of the ERP protocol to observe how traffic congestion can impact the protection performance of the proposed priority setting scheme. Based on our observations, we propose a more reliable priority setting scheme, which guarantees faultless protection, even in a congested ring.
Multicore Flow Processor with Wire-Speed Flow Admission Control
Doo, Kyeong-Hwan ; Yoon, Bin-Yeong ; Lee, Bhum-Cheol ; Lee, Soon-Seok ; Han, Man Soo ; Kim, Whan-Woo ;
ETRI Journal, volume 34, issue 6, 2012, Pages 827~837
DOI : 10.4218/etrij.12.1812.0046
We propose a flow admission control (FAC) for setting up a wire-speed connection for new flows based on their negotiated bandwidth. It also terminates a flow that does not have a packet transmitted within a certain period determined by the users. The FAC can be used to provide a reliable transmission of user datagram and transmission control protocol applications. If the period of flows can be set to a short time period, we can monitor active flows that carry a packet over networks during the flow period. Such powerful flow management can also be applied to security systems to detect a denial-of-service attack. We implement a network processor called a flow management network processor (FMNP), which is the second generation of the device that supports FAC. It has forty reduced instruction set computer core processors optimized for packet processing. It is fabricated in 65-nm CMOS technology and has a 40-Gbps process performance. We prove that a flow router equipped with an FMNP is better than legacy systems in terms of throughput and packet loss.
Design of a Cost-Effective Hybrid-Type PBEx Providing a High Power Budget in an Asymmetric 10G-EPON
Kim, Kwangok ; Lee, Sangsoo ; Lee, Jonghyun ; Jang, Younseon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 838~846
DOI : 10.4218/etrij.12.1812.0040
This paper proposes a cost-effective hybrid-type power budget extender (PBEx) that can provide a high power budget of over 45 dB in an asymmetric 10-Gb/s Ethernet passive optical network (10/1G-EPON). The hybrid-type 10/1G-EPON PBEx comprises a central office terminal (COT) and remote terminal (RT) module supporting four channels and uses a coarse wavelength division multiplexing (CWDM) technology between the COT and RT for a reduction of fiber cost and efficient access network design. The proposed 10/1G-EPON PBEx can provide over a 40-km reach and 128-way split per CWDM wavelength with no modification of a legacy 10/1G-EPON system and can satisfy the error-free service in
Nonlinear Feature Transformation and Genetic Feature Selection: Improving System Security and Decreasing Computational Cost
Taghanaki, Saeid Asgari ; Ansari, Mohammad Reza ; Dehkordi, Behzad Zamani ; Mousavi, Sayed Ali ;
ETRI Journal, volume 34, issue 6, 2012, Pages 847~857
DOI : 10.4218/etrij.12.1812.0032
Intrusion detection systems (IDSs) have an important effect on system defense and security. Recently, most IDS methods have used transformed features, selected features, or original features. Both feature transformation and feature selection have their advantages. Neighborhood component analysis feature transformation and genetic feature selection (NCAGAFS) is proposed in this research. NCAGAFS is based on soft computing and data mining and uses the advantages of both transformation and selection. This method transforms features via neighborhood component analysis and chooses the best features with a classifier based on a genetic feature selection method. This novel approach is verified using the KDD Cup99 dataset, demonstrating higher performances than other well-known methods under various classifiers have demonstrated.
Measurement-Based Stochastic Cross-Correlation Models of a Multilink Channel in Cooperative Communication Environments
Park, Jae-Joon ; Kim, Myung-Don ; Kwon, Heon-Kook ; Chung, Hyun Kyu ; Yin, Xuefeng ; Fu, Yaoyao ;
ETRI Journal, volume 34, issue 6, 2012, Pages 858~868
DOI : 10.4218/etrij.12.1812.0039
In this paper, stochastic models for the cross-correlation of multiple channels are established based on measurement data collected using a wideband multiple-input multiple-output relay Band Exploration and Channel Sounder system at 3.7 GHz. We propose models for the cross-correlation characteristics of large-scale parameters (LSPs) between two links, that is, the base station and mobile station (MS) link and the relay station and MS link. The LSPs include shadow fading, Rician K-factor, delay spread, angle spread of arrival, and angle spread of departure. Furthermore, models are established for the cross-correlation of the small-scale fading in the impulse responses of two links. The statistics of these model parameters are investigated as functions of geometrical features of the multilink. They are extracted from a large amount of cross-correlation observations, which are obtained in three measurement sites along more than one hundred measurement routes. These models can be used together with the standard single-link channel models for the generation of correlated components, for example, path clusters, in two separate channels.
Beamforming for Downlink Multiuser MIMO Time-Varying Channels Based on Generalized Eigenvector Perturbation
Yu, Heejung ; Lee, Sok-Kyu ;
ETRI Journal, volume 34, issue 6, 2012, Pages 869~878
DOI : 10.4218/etrij.12.1812.0090
A beam design method based on signal-to-leakage-plus-noise ratio (SLNR) has been recently proposed as an effective scheme for multiuser multiple-input multiple-output downlink channels. It is shown that its solution, which maximizes the SLNR at a transmitter, can be simply obtained by the generalized eigenvectors corresponding to the dominant generalized eigenvalues of a pair of covariance matrices of a desired signal and interference leakage plus noise. Under time-varying channels, however, generalized eigendecomposition is required at each time step to design the optimal beam, and its level of complexity is too high to implement in practical systems. To overcome this problem, a predictive beam design method updating the beams according to channel variation is proposed. To this end, the perturbed generalized eigenvectors, which can be obtained by a perturbation theory without any iteration, are used. The performance of the method in terms of SLNR is analyzed and verified using numerical results.
Joint Optimization of User Set Selection and Transmit Power Allocation for Orthogonal Random Beamforming in Multiuser MIMO Systems
Kang, Tae-Sung ; Seo, Bangwon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 879~884
DOI : 10.4218/etrij.12.1812.0004
When the number of users is finite, the performance improvement of the orthogonal random beamforming (ORBF) scheme is limited in high signal-to-noise ratio regions. In this paper, to improve the performance of the ORBF scheme, the user set and transmit power allocation are jointly determined to maximize sum rate under the total transmit power constraint. First, the transmit power allocation problem is expressed as a function of a given user set. Based on this expression, the optimal user set with the maximum sum rate is determined. The suboptimal procedure is also presented to reduce the computational complexity, which separates the user set selection procedure and transmit power allocation procedure.
High-Efficiency CMOS Power Amplifier Using Uneven Bias for Wireless LAN Application
Ryu, Namsik ; Jung, Jae-Ho ; Jeong, Yongchae ;
ETRI Journal, volume 34, issue 6, 2012, Pages 885~891
DOI : 10.4218/etrij.12.1812.0024
This paper proposes a high-efficiency power amplifier (PA) with uneven bias. The proposed amplifier consists of a driver amplifier, power stages of the main amplifier with class AB bias, and an auxiliary amplifier with class C bias. Unlike other CMOS PAs, the amplifier adopts a current-mode transformer-based combiner to reduce the output stage loss and size. As a result, the amplifier can improve the efficiency and reduce the quiescent current. The fully integrated CMOS PA is implemented using the commercial Taiwan Semiconductor Manufacturing Company 0.18-
RF-CMOS process with a supply voltage of 3.3 V. The measured gain,
, and efficiency at
are 29 dB, 28.1 dBm, and 37.9%, respectively. When the PA is tested with 54 Mbps of an 802.11g WLAN orthogonal frequency division multiplexing signal, a 25-dB error vector magnitude compliant output power of 22 dBm and a 21.5% efficiency can be obtained.
Analysis of Joint Multiband Sensing-Time M-QAM Signal Detection in Cognitive Radios
Tariq, Sana ; Ghafoor, Abdul ; Farooq, Salma Zainab ;
ETRI Journal, volume 34, issue 6, 2012, Pages 892~899
DOI : 10.4218/etrij.12.1812.0043
We analyze a wideband spectrum in a cognitive radio (CR) network by employing the optimal adaptive multiband sensing-time joint detection framework. This framework detects a wideband M-ary quadrature amplitude modulation (M-QAM) primary signal over multiple nonoverlapping narrowband Gaussian channels, using the energy detection technique so as to maximize the throughput in CR networks while limiting interference with the primary network. The signal detection problem is formulated as an optimization problem to maximize the aggregate achievable secondary throughput capacity by jointly optimizing the sensing duration and individual detection thresholds under the overall interference imposed on the primary network. It is shown that the detection problems can be solved as convex optimization problems if certain practical constraints are applied. Simulation results show that the framework under consideration achieves much better performance for M-QAM than for binary phase-shift keying or any real modulation scheme.
Novel Trellis-Coded Spatial Modulation over Generalized Rician Fading Channels
Zhang, Peng ; Yuan, Dongfeng ; Zhang, Haixia ;
ETRI Journal, volume 34, issue 6, 2012, Pages 900~910
DOI : 10.4218/etrij.12.1812.0101
In this paper, a novel trellis-coded spatial modulation (TCSM) design method is presented and analyzed. Inspired by the key idea of trellis-coded modulation (TCM), the detailed analysis is firstly provided on the unequal error protection performance of spatial modulation constellation. Subsequently, the Ungerboeck set partitioning rule is proposed and applied to develop a general method to design the novel TCSM schemes. Different from the conventional TCSM approaches, the novel one based on the Ungerboeck set partitioning rule has similar properties as the classic TCM, which has simple but effective code design criteria. Moreover, the novel designed schemes are robust and adaptive to the generalized Rician fading channels, which outperform the traditional TCSM ones. For examples, the novel 4-, 8-, and 16-state TCSM schemes are constructed by employing different transmit antennas and different modulation schemes in different channel conditions. Simulation results clearly demonstrate the advantages of the novel TCSM schemes over the conventional ones.
An Enhanced Approach for a Prediction Method of the Propagation Characteristics in Korean Environments at 781 MHz
Jung, Myoung-Won ; Kim, Jong Ho ; Choi, Jae Ick ; Kim, Joo Seok ; Kim, Kyungseok ; Pack, Jeong-Ki ;
ETRI Journal, volume 34, issue 6, 2012, Pages 911~921
DOI : 10.4218/etrij.12.1812.0088
In high-speed wireless communications, an analysis of the propagation characteristics is an important process. Information on the propagation characteristics suitable for each environment significantly helps in the design of mobile communications. This paper presents the analysis results of radio propagation characteristics in outdoor environments for a new mobile wireless system at 781 MHz. To avoid the interference of Korean DTV broadcasting, we measure the channel characteristics in urban, suburban, and rural areas on Jeju Island, Republic of Korea, using a channel sounder and
antenna. The path loss (PL) measurement results differ from those of existing propagation models by more than 10 dB. To analyze the frequency characteristics for Korean propagation environments, we derive various propagation characteristic parameters: PL, delay spread, angular spread, and K-factor. Finally, we verify the validity of the measurement results by comparing them with the actual measurement results and 3D ray-tracing simulation results.
A Genetic-Algorithm-Based Optimized Clustering for Energy-Efficient Routing in MWSN
Sara, Getsy S. ; Devi, S. Prasanna ; Sridharan, D. ;
ETRI Journal, volume 34, issue 6, 2012, Pages 922~931
DOI : 10.4218/etrij.12.1812.0047
With the increasing demands for mobile wireless sensor networks in recent years, designing an energy-efficient clustering and routing protocol has become very important. This paper provides an analytical model to evaluate the power consumption of a mobile sensor node. Based on this, a clustering algorithm is designed to optimize the energy efficiency during cluster head formation. A genetic algorithm technique is employed to find the near-optimal threshold for residual energy below which a node has to give up its role of being the cluster head. This clustering algorithm along with a hybrid routing concept is applied as the near-optimal energy-efficient routing technique to increase the overall efficiency of the network. Compared to the mobile low energy adaptive clustering hierarchy protocol, the simulation studies reveal that the energy-efficient routing technique produces a longer network lifetime and achieves better energy efficiency.
A Long-Range Touch Interface for Interaction with Smart TVs
Lee, Jaeyeon ; Kim, DoHyung ; Kim, Jaehong ; Cho, Jae-Il ; Sohn, Joochan ;
ETRI Journal, volume 34, issue 6, 2012, Pages 932~941
DOI : 10.4218/etrij.12.0111.0667
A powerful interaction mechanism is one of the key elements for the success of smart TVs, which demand far more complex interactions than traditional TVs. This paper proposes a novel interface based on the famous touch interaction model but utilizes long-range bare hand tracking to emulate touch actions. To satisfy the essential requirements of high accuracy and immediate response, the proposed hand tracking algorithm adopts a fast color-based tracker but with modifications to avoid the problems inherent to those algorithms. By using online modeling and motion information, the sensitivity to the environment can be greatly decreased. Furthermore, several ideas to solve the problems often encountered by users interacting with smart TVs are proposed, resulting in a very robust hand tracking algorithm that works superbly, even for users with sleeveless clothing. In addition, the proposed algorithm runs at a very high speed of 82.73 Hz. The proposed interface is confirmed to comfortably support most touch operations, such as clicks, swipes, and drags, at a distance of three meters, which makes the proposed interface a good candidate for interaction with smart TVs.
High-Speed Traveling-Wave Photodetector with a 3-dB Bandwidth of 410 GHz
Park, Jeong-Woo ; Han, Sangpil ; Lee, Donghun ; Ryu, Han-Cheol ; Shin, Jun-Whan ; Kim, Namje ; Yoon, Young-Jong ; Ko, Hyunsung ; Park, Kyung Hyun ;
ETRI Journal, volume 34, issue 6, 2012, Pages 942~945
DOI : 10.4218/etrij.12.0212.0173
A high-speed traveling-wave photodetector (TWPD) with an InGaAs absorber is designed and realized. The bandwidth of the TWPD is measured using electro-optic sampling techniques. The bandwidth is 410 GHz, which shows that the RC limitation is overcome. While the TWPD shows a low responsivity of 0.06 A/W at 1,550 nm, this value can be improved through further optimization of the structure without a sacrifice in bandwidth.
Optimization of a Birefringence-Enhanced-Waveguide-Based Polarization Beam Splitter
Kim, Jong-Hoi ; Choe, Joong-Seon ; Youn, Chun-Ju ; Kim, Duk-Jun ; Kwon, Yong-Hwan ; Nam, Eun-Soo ;
ETRI Journal, volume 34, issue 6, 2012, Pages 946~949
DOI : 10.4218/etrij.12.0212.0186
We present the optimization of a birefringence-enhanced-waveguide (BWG)-based polarization beam splitter (PBS) in a Mach-Zehnder interferometer (MZI) configuration and analyze the structure-dependent or polarization-dependent phase difference, using a delay-line MZI (DL-MZI). We fabricate the DL-MZI using silica-based planar lightwave circuit technology and, using the DL-MZI, demonstrate the ability to optimize a PBS by measuring the birefringence of the BWG and structure-dependent phase offset.
Low Temperature Characteristics of Schottky Barrier Single Electron and Single Hole Transistors
Jang, Moongyu ; Jun, Myungsim ; Zyung, Taehyoung ;
ETRI Journal, volume 34, issue 6, 2012, Pages 950~953
DOI : 10.4218/etrij.12.0212.0194
Schottky barrier single electron transistors (SB-SETs) and Schottky barrier single hole transistors (SB-SHTs) are fabricated on a 20-nm thin silicon-on-insulator substrate incorporating e-beam lithography and a conventional CMOS process technique. Erbium- and platinum-silicide are used as the source and drain material for the SB-SET and SB-SHT, respectively. The manufactured SB-SET and SB-SHT show typical transistor behavior at room temperature with a high drive current of
, respectively. At 7 K, these devices show SET and SHT characteristics. For the SB-SHT case, the oscillation period is 0.22 V, and the estimated quantum dot size is 16.8 nm. The transconductance is
for the SB-SET and SB-SHT, respectively. In the SB-SET and SB-SHT, a high transconductance can be easily achieved as the silicided electrode eliminates a parasitic resistance. Moreover, the SB-SET and SB-SHT can be operated as a conventional field-effect transistor (FET) and SET/SHT depending on the bias conditions, which is very promising for SET/FET hybrid applications. This work is the first report on the successful operations of SET/SHT in Schottky barrier devices.
Tuned Optical Reflection Characteristics of Chemically-Treated Ti Substrates
Yun, Ho-Gyeong ; Kim, Myoung ; You, In-Kyu ;
ETRI Journal, volume 34, issue 6, 2012, Pages 954~957
DOI : 10.4218/etrij.12.0212.0204
Titanium foils for use in photoelectrochemical devices are treated with a
-HF solution. After this treatment, the optical reflection characteristics of the Ti substrates are markedly increased in terms of not only reflectivity but also optimized wavelength. Furthermore, the "multiple beam interference" theory and optical analysis of surface morphologies clearly verify the origin of the optimized optical reflection properties.
Harmonic and Percussive Separation Based on NMF and Tonality Mask
Choi, Keunwoo ; Chon, Sang Bae ; Kang, Kyeongok ;
ETRI Journal, volume 34, issue 6, 2012, Pages 958~961
DOI : 10.4218/etrij.12.0212.0107
In this letter, we present a new algorithm for the harmonic and percussive separation of jazz music. Using a short-time Fourier transform and nonnegative matrix factorization, the signal is decomposed into rank components. Each component is then split into harmonic and percussive parts using masks calculated based on their tonalities. Finally, the harmonic and percussive parts are separated after applying the masks and a summation. We evaluate the algorithm based on real audio examples using both objective and subjective assessments. The proposed algorithm performs well for the separation of harmonic and percussive parts of jazz excerpts.
Simulation and Fabrication Studies of Semi-superjunction Trench Power MOSFETs by RSO Process with Silicon Nitride Layer
Na, Kyoung Il ; Kim, Sang Gi ; Koo, Jin Gun ; Kim, Jong Dae ; Yang, Yil Suk ; Lee, Jin Ho ;
ETRI Journal, volume 34, issue 6, 2012, Pages 962~965
DOI : 10.4218/etrij.12.0212.0127
In this letter, we propose a new RESURF stepped oxide (RSO) process to make a semi-superjunction (semi-SJ) trench double-diffused MOSFET (TDMOS). In this new process, the thick single insulation layer (
) of a conventional device is replaced by a multilayered insulator (
) to improve the process and electrical properties. To compare the electrical properties of the conventional RSO TDMOS to those of the proposed TDMOS, that is, the nitride_RSO TDMOS, simulation studies are performed using a TCAD simulator. The nitride_RSO TDMOS has superior properties compared to those of the RSO TDMOS, in terms of drain current and on-resistance, owing to a high nitride permittivity. Moreover, variations in the electrical properties of the nitride_RSO TDMOS are investigated using various devices, pitch sizes, and thicknesses of the insulator. Along with an increase of the device pitch size and the thickness of the insulator, the breakdown voltage slowly improves due to a vertical field plate effect; however, the drain current and on-resistance degenerate, owing to a shrinking of the drift width. The nitride_RSO TDMOS is successfully fabricated, and the blocking voltage and specific on-resistance are 108 V and
Effect of Oxygen Binding Energy on the Stability of Indium-Gallium-Zinc-Oxide Thin-Film Transistors
Cheong, Woo-Seok ; Park, Jonghyurk ; Shin, Jae-Heon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 966~969
DOI : 10.4218/etrij.12.0212.0232
From a practical viewpoint, the topic of electrical stability in oxide thin-film transistors (TFTs) has attracted strong interest from researchers. Positive bias stress and constant current stress tests on indium-gallium-zinc-oxide (IGZO)-TFTs have revealed that an IGZO-TFT with a larger Ga portion has stronger stability, which is closely related with the strong binding of O atoms, as determined from an X-ray photoelectron spectroscopy analysis.
Pressure Control Organic Vapor Deposition Methods for Fabricating Organic Thin-Film Transistors
Ahn, SeongDeok ; Kang, Seong Youl ; Oh, Ji Young ; Suh, Kyung Soo ; Cho, Kyoung Ik ; Koo, Jae Bon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 970~973
DOI : 10.4218/etrij.12.0212.0266
In this letter, we report on the development progress of a pressure control organic vapor deposition (PCOVD) technology used to design and build a large area deposition system. We also investigate the growth characteristics of a pentacene thin film by PCOVD. Using the PCOVD method, the mobility and on/off current ratio of an organic thin-film transistor (OTFT) on a plastic substrate are
, respectively. The developed OTFT can be applied to a flexible display on a plastic substrate.
Design of an Ultra-Compact UHF Passive RFID Tag Antenna for a Medical Sample Tube
Lee, Jung-Nam ; Hwang, Moon-Young ; Lee, Sang-Il ; Lee, Kwang-Chun ; Park, Jong-Kweon ;
ETRI Journal, volume 34, issue 6, 2012, Pages 974~977
DOI : 10.4218/etrij.12.0212.0161
In this letter, a small-sized ultra-high frequency (UHF) RFID tag antenna for a medical sample tube is proposed. The RFID tag antenna is designed and fabricated based on the circular loop antenna used in the UHF band (Korea standard, 917 MHz to 923.5 MHz). The tag antenna size is reduced using a circular meander stub. The antenna has a physical size of 8 mm, which is about
/40 in electrical length. The proposed tag antenna is molded into a medical sample and multitag identification is performed.
An Analytic Solution to Projector Pose Estimation Problem
Lee, Joo-Haeng ;
ETRI Journal, volume 34, issue 6, 2012, Pages 978~981
DOI : 10.4218/etrij.12.0212.0089
We present an analytic solution to the projector pose estimation problem for the pinhole projection model in which the source image is a centered rectangle with an unknown aspect ratio. From a single quadrilateral given as a target image, our solution gives the position and orientation of a projector as well as the aspect ratio of a source image. The proposed method decomposes the problem into two pose estimation problems of coupled line projectors aligned at each diagonal of the given quadrilateral and then computes the common solution that satisfies the relevant geometric constraints. The solution is formulated as simple analytic equations. We also provide a determinant of projectability of an arbitrary quadrilateral.