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Algorithms and methods for analyzing large amounts of data are studied and developed. This paper presents a Data Mining (DM) method operated in grid computing environment. Because DM technology uses large amounts of data and requires costs to compute, utilizing and sharing computing data and resources are key issues in DM. Therefore, a Dynamic Load Balancing (DLB) algorithm and a decision range readjustment...
Nowadays, much research in recent years has focused on IoT (Internet of Things). The home domain is the most important research area of IoT, because there expected accounts of home smart device for over 40 percent of connected device excepting mobile phone. Furthermore, enormous data is generated by home smart device. There is growing concern, but the previous works didn't address enough to manage...
We explore methods for effectively extracting information from clinical narratives, which are captured in a public health consulting phone service called HealthLink. The currently available data consists of dialogues constructed by nurses while consulting patients on the phone. Since the data are interviews transcribed by nurses during phone conversations, they include a significant volume and variety...
This research proposes new system which finds the music by using Query-by-humming (QBH). For finding a stored music, the features of humming data are selected by using G.729 feature extractor. We normalize the extracted features by using mean-shifting, median filtering, average filtering and min-max scaling methods. Then the corresponding music is matched based on dynamic time warping (DTW) algorithm...
In this paper, the fully integrated differential LC voltage controller oscillator (VCO) is designed and fabricated in InGaP/GaAs HBT technology. The VCOs have the different two output buffer structures for low phase noise. To optimize buffers, two oscillators are compared. One is a common-collector buffer VCO (C-VCO), and the other one is a common-emitter buffer VCO (E-VCO). The C-VCO has better phase...
In this paper, a Ka-band GaAs pseudomorphic high electron mobility transistor (P-HEMT) monolithic microwave integrated circuit (MMIC) power amplifier for very small aperture terminal (VSAT) outdoor unit (ODU) transmitter applications in demonstrated. This three-stage power amplifier is designed to fully match the 50 ?? input and output impedances. With 6 V and -0.75 V DC bias, a small signal gain...
With strong needs of continued miniaturization and high density integration of semiconductor packages, the wafer level package technology leads the semiconductor package trend. For high reliability of the devices, wafer bumps and substrate bumps used for their connection junctions need to be in-line inspected in terms of top-height distribution, coplanarity, and volume uniformity. In this paper, a...
In this paper, we propose and analyze an turbo coding scheme for optical CDMA systems. It is assumed that optical channel is an intensity modulated (IM) channel and direct-detection scheme is employed to detect the received optical signal. From simulation results, it is demonstrated that bit error probability (BEP) and throughput performance is substantially improved with the number of iterations...
This paper considers power allocation in spatially-correlated dual-hop multiple-input multiple-output (MIMO) relay channels under power constraint for each hop channel. The proposed scheme allocates the transmit power considering the spatial correlation as well as the average signal-to-noise ratio (SNR) of dual-hop MIMO relay channels. By means of upper-bound analysis, the proposed scheme can minimize...
We propose a V5-HBT line coding for a visible light communication (VLC) system. V5-HBT line coding is defined as follows. First, we apply half bit transition to one bit. Second, we decode encoded bits using difference of bit transition level in one bit duration. As a result, we obtain advantages about synchronization problem and noise effect mitigation at the receiver. We set up outdoor the VLC simulation...
In this paper, we propose a efficient primary user detection method in cognitive radio (CR). We adopt a delay diversity receiver for solving problems of the conventional spectrum detector utilizing multiple antennas, which are the increase in hardware complexity and cost. From simulation results, it is demonstrated that the primary user detector with delay diversity receiver has almost half complexity...
In this paper, we propose co-channel interference (CCI) cancellation strategy for cooperative communication systems in wireless communication network. In the proposed strategy, CCI is mitigated by zero forcing (ZF) or minimum mean square error (MMSE) receivers. Moreover, successive interference cancellation (SIC) efficiently. And we analyzed and simulated the proposed system performance in Rayleigh...
According to dramatic increase of wireless communication demand, more spectrum resources are needed to support considerable and various wireless services. However, limited spectrum resources are regulatory assigned to licensed user and no interference needs to occur from unlicensed user to licensed user. In this paper, we propose efficient decision rule in order to get better chance to detect the...
We propose a Z-HBT line coding for a visible light communication (VLC) system. Z-HBT line coding is defined as follows. First, we apply half bit transition to one bit. Second, we decode encoded bits using difference of bit transition level in one bit duration. As a result, we obtain advantages about synchronization problem and noise effect mitigation at the receiver. We set up outdoor the VLC simulation...
In this paper, the performance of a double binary turbo coded space time block code-ultra wide band (STBC-UWB) system is analyzed and simulated in multi-user environments. From the simulation results, it is demonstrated that the double binary turbo coding technique offers considerable coding gain with reasonable encoding and decoding complexity. It is confirmed that the double binary turbo coding...
Cognitive radio (CR), which is proposed as a technology that utilizes the frequency resources effectively, has studied to relive scarcity of the frequency resources. CR provides opportunistically under-utilize licensed frequency to the secondary user. Spectrum sensing is the most important technology to detect primary user. However, in the wireless channels, according to the effect of fading and shadowing...
Advance technologies in decentralized systems are the new building block of today's Internet and provide interoperability among heterogeneous databases. In these environments, interoperation and information sharing are one of the most critical issues. Interoperability enables users to access database in different domain. Furthermore, government, financial and medical institutions more require secure...
In this paper, we analyze and simulate the iterative decoding performance of space time block coded (STBC) pulse position modulation-time hopping (PPM-TH) ultra-wideband (UWB) systems in indoor environments. The indoor wireless channel is modeled as a modified Saleh and Valenzuela (SV) channel, which is proposed as a UWB indoor channel model by IEEE 802.15.SG3a. In order to reduce the iterative decoding...
Future Internet is a clean-slate research activity in the quest of new networking technologies to overcome the limits of the current Internet. In its experimental research, virtualization and federation are emerging as essential features, especially in the construction and operation of the testbeds. Moreover, they are believed to sustain as the fundamental features of the Future Internet itself. Visions...
This paper explores the method for Korean text watermarking and develops a morpheme-based scheme that a predicate nominal is segmented into a nominal and a predicate. Korean, as an agglutinative language, provides a good ground for the morpheme-based natural language watermarking. Korean word usually consists of a content morpheme and function morphemes. However, predicate nominal has two content...
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