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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Institute of Electronics and Information Engineers
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The Institute of Electronics Engineers of Korea
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Volume & Issues
Volume 50, Issue 12 - Dec 2013
Volume 50, Issue 11 - Nov 2013
Volume 50, Issue 10 - Oct 2013
Volume 50, Issue 9 - Sep 2013
Volume 50, Issue 8 - Aug 2013
Volume 50, Issue 7 - Jul 2013
Volume 50, Issue 6 - Jun 2013
Volume 50, Issue 5 - May 2013
Volume 50, Issue 4 - Apr 2013
Volume 50, Issue 3 - Mar 2013
Volume 50, Issue 2 - Feb 2013
Volume 50, Issue 1 - Jan 2013
Selecting the target year
Information Potential with Shifted Symbol Points and Related Blind Equalizer Algorithms
Kim, Namyong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 3~10
DOI : 10.5573/ieek.2013.50.2.003
Please In this paper, to cope with biased impulsive noise problems, a new information potential is proposed that can move the transmitted symbol points by modifying the information potential designed with Dirac-delta functions. Based on the proposed information potential a new blind algorithm is derived by employing an augmented filter structure. From the simulation results in the environment of biased impulsive noise, the conventional algorithms yield performance degradation by over 15 dB, but the proposed algorithm shows no performance degradation and holds the same steady state MSE of below -25 dB as after the initial convergence regardless of the channel conditions.
The Impact of Access Rate Regulation on ISP Revenue and Pricing
Lee, Seung-Ho ; Seo, Seung-Woo ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 11~19
DOI : 10.5573/ieek.2013.50.2.011
Internet service providers regulate the maximum data transmission rate of each user as a means to provide a tiered Internet access service or to avoid the monopoly of a few greedy users. In this paper, we aim to analyze the impact of this access rate regulation on the revenue of Internet service provider and the pricing strategy. We first propose a service quality model taking into account the access rate regulation, and analyze how the regulation affects the service subscription decision of users. In addition, we derive a sufficient condition that guarantees the stability of the revenue, and formulate an optimization problem that finds the optimal price to maximize the revenue.
PHY Frame Structure Design for M2M Direct Communications
Oh, Changyoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 20~26
DOI : 10.5573/ieek.2013.50.2.020
We propose PHY Frame Structure for M2M direct communications in licensed frequency band. Especially, the proposed PHY Frame Structure coexists in the same licensed frequency band as currently operating cellular systems. Recently, Machine to Machine (M2M) service markets, including SmartGrid, Mobile Health, and Smart Car, are being rapidly expanded. Supporting M2M services in a specific case can waste Radio Resource in cellular systems. For example, when two M2M terminals communicating to each other are closely located, direct communication is radio resource efficient. In this paper, we set the requirement of maintaining the existing PHY frame structure in cellular systems to meet the backward compatibility. Based on this backward compatibility requirement, PHY frame structure for M2M direct communications is developed while satisfying coexistence with current operating cellular system. The proposed PHY frame structure meets backward compatibility. Accordingly, it is expected that the proposed M2M frame structure is useful for its frequency resource efficiency.
Low Complexity Power Allocation Scheme for MIMO Multiple Relay System With Weighted Diagonalization
Lee, Bumsoo ; Lee, Chungyong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 27~34
DOI : 10.5573/ieek.2013.50.2.027
We propose a simple power allocation scheme for an amplify-and-forward multiple relay system with multiple-input multiple-output antennas. Unlike the existing relay precoding matrix with full elements, proposed precoder is a diagonal matrix whose diagonal element is the relay gain for each stream. Furthermore, a weight vector is applied to streams, such that the mutual information of the system approaches that of the exhaustive search scheme, regardless of the number of antennas. Numerical results show that proposed scheme outperforms the conventional schemes with respect to mutual information.
The Design and Implementation of Network Measurement System for Mobile Platforms
Kim, Kanghee ; Yeo, Jinjoo ; Kim, JinHyuk ; Choi, SangBang ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 35~46
DOI : 10.5573/ieek.2013.50.2.035
As a rapid increase of mobile network usage, many studies on solution for network traffic's demand problem have been done. Especially network environment measurement area provides basis for solving network traffic's demand problem by finding causes of problems through accurate network analysis. However, as increase of demand for smartphone, we should consider effects of mobile platform's property measuring mobile network. In this paper, we design a network traffic measurement system considering mobile platform. Through the information from packets, this system calculates packet transmission delay and throughput. We minimize computation cost required for a mobile device that is a client in this system. When fully using network resources, we found that Wi-Fi has shorter transmission delay, higher maximum throughput and lower loss rate than 3G, Android has shorter transmission delay and higher maximum throughput than iOS, and UDP has longer transmission delay and higher maximum throughput through this system.
Signal Transmission Properties Improvement of Serial Advanced Technology Attachment Connector Using Analysis of Differential Impedance
Yang, Jeong-Kyu ; Kim, Moonjung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 47~53
DOI : 10.5573/ieek.2013.50.2.047
In this work, signal transmission properties of SATA connector have been improved using its differential impedance calculation and its design revision to closer impedance matching. Using 3 dimensional electromagnetic field simulator, the differential mode S-parameter was calculated to investigate its signal fidelity. The differential impedance is calculated from the equation of the odd mode impedance with inductance, capacitance, mutual inductance, and mutual capacitance. The differential impedance of SATA connector was calculated to be
and did not meet the design specification with
. In order to achieve its impedance range and improve its signal transmission properties, SATA connector's design has been revised with two different directions and analyzed through the calculation of differential impedance, differential reflection loss, and differential insertion loss.
Dual-Band Branch-Line Coupler Using Shorted Stubs
Kim, Jong-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 54~59
DOI : 10.5573/ieek.2013.50.2.054
This letter presents a shorted-stub tapped branch-line coupler for dual-band applications. In the new design, a shorted stub is used to realize 90 phase change at two frequencies. Closed-form design equations are derived to find the characteristic impedance and electrical length of the proposed branch lines using the ABCD-matrix. To verify the design concept, a microstrip coupler operating at 0.8 and 1.85 GHz is fabricated and measured.
A Security Monitoring System for Security Information Sharing and Cooperative Countermeasure
Kim, Ki-Young ; Lee, Sung-Won ; Kim, Jong-Hyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 60~69
DOI : 10.5573/ieek.2013.50.2.060
Highlighted by recent security breaches including Google, Western Energy Company, and the Stuxnet infiltration of Iranian nuclear sites, Cyber warfare attacks pose a threat to national and global security. In particular, targeted attacks such as APT exploiting a high degree of stealthiness over a long period, has extended their victims from PCs and enterprise servers to government organizations and critical national infrastructure whereas the existing security measures exhibited limited capabilities in detecting and countermeasuring them. As a solution to fight against such attacks, we designed and implemented a security monitoring system, which shares security information and helps cooperative countermeasure. The proposed security monitoring system collects security event logs from heterogeneous security devices, analyses them, and visualizes the security status using 3D technology. The capability of the proposed system was evaluated and demonstrated throughly by deploying it under real network in a ISP for a week.
A Data Fault Attack on the Miller Algorithm for Pairing Computation in Mobile Ad-Hoc Network Environments
Bae, KiSeok ; Sohn, GyoYong ; Park, YoungHo ; Moon, SangJae ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 70~79
DOI : 10.5573/ieek.2013.50.2.070
Recently, there has been introduced various types of pairing computations to implement ID based cryptosystem for mobile ad hoc network. The Miller algorithm is the most popular algorithm for the typical pairing computation such as Weil, Tate and Ate. In this paper, we analyze the feasibility of concrete data fault injection attack, which was proposed by Whelan and Scott, in terms of regardless of round positions during the execution of the Miller algorithm. As the simulation results, the proposed attack that can be employed to regardless of round positions and coordinate systems is effective and powerful.
Distance and Probability-based Real Time Transmission Scheme for V2V Protocol using Dynamic CW allocation
Kim, Soo-Ro ; Kim, Dong-Seong ; Lee, Ho-Kyun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 80~87
DOI : 10.5573/ieek.2013.50.2.080
This paper proposes a CW (Contention window) allocation scheme for real-time data transmission of emergency data on VANET (Vehicle to vehicle Ad hoc Network, V2V) protocol. The proposed scheme reduces the probability of packet collisions on V2V protocol and provides bandwidth efficiency with short delay of emergency sporadic data. In the case of high density traffic, the proposed scheme provides a decrease of recollision probability using dynamic CW adjustments. For the performance analysis, a throughput, end-to-end delays, and network loads were investigated on highway traffic. Simulation results show the performance enhancements in terms of the throughput, end-to-end delays, and network loads.
Study on Self-Heating Effects in AlGaN/GaN-on-Si Power Transistors
Kim, Shin Young ; Cha, Ho-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 91~97
DOI : 10.5573/ieek.2013.50.2.091
Self-heating effects during operation of high current AlGaN/GaN power transistors degrade the current-voltage characteristics. In particular, this problem becomes serious when a low thermal conductivity Si substrate is used. In this work, AlGaN/GaN-on-Si devices were fabricated with various channel widths and Si substrate thicknesses in which the structure dependent self-heating effects were investigated by temperature dependent measurements as well as thermal simulation. Accordingly, a device structure that can effectively dissipate the heat was proposed in order to achieve the maximum current in a multi-channel, large area device. Employing via-holes and common electrodes with a 100
Si substrate thickness improved the current level by 75% reducing the channel temperature by 68%.
Influence of Co-sputtered HfO
-Si Gate Dielectric in IZO-based thin Film Transistors
Cho, Dong Kyu ; Yi, Moonsuk ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 98~103
DOI : 10.5573/ieek.2013.50.2.098
In this work, we investigated the enhanced performance of IZO-based TFTs with
gate insulators. Four types of
gate insulators using different diposition powers were deposited by co-sputtering
and Si target. To simplify the processing sequences, all of the layers composing of TFTs were deposited by rf-magnetron sputtering method using patterned shadow-masks without any intentional heating of substrate and subsequent thermal annealing. The four different
structural properties were investigated x-ray diffraction(XRD), atomic force microscopy(AFM) and also analyzed the electrical characteristics. There were some noticeable differences depending on the composition of the
and Si combination. The TFT based on
gate insulator with
(100W)-Si(100W) showed the best results with a field effect mobility of 2.0[
], a threshold voltage of -0.5[V], an on/off ratio of 5.89E+05 and RMS of 0.26[nm]. This show that the composition of the
and Si is an important factor in an
insulator. In addition, the effective bonding of
and Si reduced the defects in the insulator bulk and also improved the interface quality between the channel and the gate insulator.
High-Throughput QC-LDPC Decoder Architecture for Multi-Gigabit WPAN Systems
Lee, Hanho ; Ajaz, Sabooh ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 104~113
DOI : 10.5573/ieek.2013.50.2.104
A high-throughput Quasi-Cyclic Low-Density Parity-Check (QC-LDPC) decoder architecture is proposed for 60GHz multi-gigabit wireless personal area network (WPAN) applications. Two novel techniques which can apply to our selected QC-LDPC code are proposed, including a four block-parallel layered decoding technique and fixed wire network. Two-stage pipelining and four block-parallel layered decoding techniques are used to improve the clock speed and decoding throughput. Also, the fixed wire network is proposed to simplify the switch network. A 672-bit, rate-1/2 QC-LDPC decoder architecture has been designed and implemented using 90-nm CMOS standard cell technology. Synthesis results show that the proposed QC-LDPC decoder requires a 794K gate and can operate at 290 MHz to achieve a data throughput of 3.9 Gbps with a maximum of 12 iterations, which meet the requirement of 60 GHz WPAN applications.
IEEE std. 1500 based an Efficient Programmable Memory BIST
Park, Youngkyu ; Choi, Inhyuk ; Kang, Sungho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 114~121
DOI : 10.5573/ieek.2013.50.2.114
As the weight of embedded memory within Systems-On-Chips(SoC) rapidly increases to 80-90% of the number of total transistors, the importance of testing embedded memory in SoC increases. This paper proposes IEEE std. 1500 wrapper based Programmable Memory Built-In Self-Test(PMBIST) architecture which can support various kinds of test algorithm. The proposed PMBIST guarantees high flexibility, programmability and fault coverage using not only March algorithms but also non-March algorithms such as Walking and Galloping. The PMBIST has an optimal hardware overhead by an optimum program instruction set and a smaller program memory. Furthermore, the proposed fault information processing scheme guarantees improvement of the memory yield by effectively supporting three types of the diagnostic methods for repair and diagnosis.
An Offset and Deadzone-Free Constant-Resolution Phase-to-Digital Converter for All-Digital PLLs
Choi, Kwang-Chun ; Kim, Min-Hyeong ; Choi, Woo-Young ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 122~133
DOI : 10.5573/ieek.2013.50.2.122
An arbiter-based simple phase decision circuit (PDC) optimized for high-resolution phase-to-digital converter made up of an analog phase-frequency detector and a time-to-digital converter for all-digital phase-locked loops is proposed. It can distinguish very small phase difference between two pulses even though it consumes lower power and has smaller input-to-output delay than the previously reported PDC. Proposed PDC is realized using 130-nm CMOS process and demonstrated by transistor-level simulations. A 5-bit P2D having no offset nor deadzone using the PDC is also demonstrated. A harmonic-lock-free and small-phase-offset delay-locked loop for fixing the P2D resolution regardless of PVT variations is also proposed and demonstrated.
Design of 3~10GHz UWB Frequency Synthesizer for MBOA System
Kim, Dong-Shik ; Chai, Sang-Hoon ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 134~139
DOI : 10.5573/ieek.2013.50.2.134
This paper describes design of a RF frequency synthesizer for the MBOA UWB systems with
silicon CMOS technology. To generate effective clock signal of the MBOA novel technique which uses large scale multiplication in band of low frequency and small scale multiplication in band of high frequency has been used to reduce oscillation bandwidth of VCO. To get good performance of high speed and wide band operation characteristics a VCO using PMOS core structure and a frequency divider using super dynamic structure used in design of PLL circuit.
Data Deduplication Method using Locality-based Chunking policy for SSD-based Server Storages
Lee, Seung-Kyu ; Kim, Ju-Kyeong ; Kim, Deok-Hwan ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 143~151
DOI : 10.5573/ieek.2013.50.2.143
NAND flash-based SSDs (Solid State Drive) have advantages of fast input/output performance and low power consumption so that they could be widely used as storages on tablet, desktop PC, smart-phone, and server. But, SSD has the disadvantage of wear-leveling due to increase of the number of writes. In order to improve the lifespan of the SSD, a variety of data deduplication techniques have been introduced. General fixed-size splitting method allocates fixed size of chunk without considering locality of data so that it may execute unnecessary chunking and hash key generation, and variable-size splitting method occurs excessive operation since it compares data byte-by-byte for deduplication. This paper proposes adaptive chunking method based on application locality and file name locality of written data in SSD-based server storage. The proposed method split data into 4KB or 64KB chunks adaptively according to application locality and file name locality of duplicated data so that it can reduce the overhead of chunking and hash key generation and prevent duplicated data writing. The experimental results show that the proposed method can enhance write performance, reduce power consumption and operation time compared to existing variable-size splitting method and fixed size splitting method using 4KB.
A Study on Prediction Reputation System for Prevention of SPIT
Bae, Kwang-Yong ; Lee, Jae-Eun ; Kim, Young-Beom ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 152~160
DOI : 10.5573/ieek.2013.50.2.152
This paper proposes a prediction reputation system for the anti-SPIT solution in real-time VoIP environment. The existing schemes need to get the user's feedback and/or have experienced the time delay and overload as session initiates due to real-time operation. To solve these problems, the proposed scheme predicts the reputation through the statistical analysis based on the period of session initiation of each caller and the call duration of each receiver. As per the second mentioned problem, this scheme performs the prediction before session initiation, therefore, it's proper for real-time VoIP environment.
Novel VO and HO Map for Vertical Obstacle Detection in Driving Environment
Baek, Seung-Hae ; Park, Soon-Yong ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 163~173
DOI : 10.5573/ieek.2013.50.2.163
We present a new computer vision technique which can detect unexpected or static vertical objects in road driving environment. We first obtain temporal and spatial difference images in each frame of a stereo video sequence. Using the difference images, we then generate VO and HO maps by improving the conventional V and H disparity maps. From the VO and HO maps, candidate areas of vertical obstacles on the road are detected. Finally, the candidate areas are merged and refined to detect vertical obstacles.
Power Quality Measurement for LED-based Green Energy Lighting Systems
Yu, Hyung-Mo ; Choi, Jin-Won ; Choe, Sangho ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 174~184
DOI : 10.5573/ieek.2013.50.2.174
For the successful R&D and deployment of LED-based green energy lighting systems, the real-time power quality measurement of both various non-linear power signals including pulse waveform, spike waveform, etc and the undesired-signals including harmonics, sag, swell, etc is required. In this paper, we propose a low-cost power quality measurement (PQM) method for low- (60Hz-several KHz) to high-frequency (several tens KHz) power signals, which are generated by green-energy lighting systems, and implement a PQM testbed using TI TMS320F28335 MCU. The proposed algorithm is programmed using C in the CCS (Code Composer Studio) 3.3 environment and is verified using test signals generated by an arbitrary signal generator, NF-WF1974. In the implemented testbed, we can measure various non-linear current signals that LED SMPS generates, analyze harmonics by fast Fourier transform, and test sag, swell, and interruption using wavelet transform.
Speech/Mixed Content Signal Classification Based on GMM Using MFCC
Kim, Ji-Eun ; Lee, In-Sung ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 185~192
DOI : 10.5573/ieek.2013.50.2.185
In this paper, proposed to improve the performance of speech and mixed content signal classification using MFCC based on GMM probability model used for the MPEG USAC(Unified Speech and Audio Coding) standard. For effective pattern recognition, the Gaussian mixture model (GMM) probability model is used. For the optimal GMM parameter extraction, we use the expectation maximization (EM) algorithm. The proposed classification algorithm is divided into two significant parts. The first one extracts the optimal parameters for the GMM. The second distinguishes between speech and mixed content signals using MFCC feature parameters. The performance of the proposed classification algorithm shows better results compared to the conventionally implemented USAC scheme.
Underwater Acoustic Image Classification of a Cylindrical object using the Hough Transformation and Nth Degree Polynomial Interpolation
Jeong, Euicheol ; Shim, Taebo ; Kim, Jangeun ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 193~200
DOI : 10.5573/ieek.2013.50.2.193
In this paper, underwater acoustic image classification of a cylindrical object using the Hough transformation is proposed. Hough transformation is often used to classify a cylindrical object in the optical systems. However, it is difficult to apply to the underwater acoustic image system because of lower resolution and noisier underwater environments. Thus, the cylindrical object was modeled and its geometric depth(GD) pixels were restored in order to make them suitable for the Hough transformation by using moving average filter and a polynomial interpolation method. As a result, restored GD pixels are similar to original ones and test results show high performance in classification.
Research for The Environmental Optimization of Dose and Image quality in Digital Radiography
Lee, Kwang Jae ; Kim, MinGi ; Lee, Jong Woong ; Kim, Ho Cheol ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 203~209
DOI : 10.5573/ieek.2013.50.2.203
Digital Radiography (DR) has improved a quality of resolution based on a wide dynamic range, high detective quantum efficiency (DQE), and modulation transfer function (MTF), compared with film/screen(F/s). Unlike expectation that a low level of radiation can be used in examination, high level of signal to noise ratio(SNR) due to over-exposure caused increase of exposed dose to patients. Also, the auto exposure control (AEC) using Kilovolage(kVp) in F/S can cause over-exposure. Hence, in this study, we proposed a proper method for using DR, in which effect of tubing Kilovolage on device's image, DR MTF measurement with changes of tubing current (mA), and the quantitative evaluation of skull phantom captured images' PSNR were evaluated. Changes of contrast with tubing Kilovolage can be improved by retouching, and MTF changes according to tubing current(1.41~1.39 lp/mm in 50% area, and 3.19~2.8 lp/mm in 10% area) does not influence on resolution of image. As a result, high tubing Kilovoltage, and tubing current will be suitable to use of DR.
A Study on Performance Evaluation for Electrocardiography Signal Measurement Electrode based on Conductive Fabric
Kang, Bo Kyu ; Yoo, Sun Kook ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 210~220
DOI : 10.5573/ieek.2013.50.2.210
Recently, as we move toward a society with an increasingly aged population, wearable U-health devices in various shapes with smart wear have been developed in order to conveniently measure health variables without using hands in daily life or at home. However, the problem is that only supply of the wearable U-health devices is focused and its applicable devices are studied and developed, which has resulted in lack of awareness of importance of performance evaluation. In this study, two electrodes were fabricated using conductive fabric which can be used as electrode if attached to wearable U-health devices or smart wear in order to measure ECG signal. Two electrodes those were fabricated using conductive fabric were compared the correlation, impedance and CMRR with patch typed Ag-AgCl electrode-normally used for measurement of ECG signal, so that the study would find out if the fabricated electrode can be used with the wearable U-health devices by testing and evaluating performances.
Design of Real-time Vital-Sign Encryption Module for Wearable Personal Healthcare Device
Kim, Jungchae ; Yoo, Sun Kook ;
Journal of the Institute of Electronics and Information Engineers, volume 50, issue 2, 2013, Pages 221~231
DOI : 10.5573/ieek.2013.50.2.221
Exchanging personal health information(PHI) is an essential process of healthcare services using information and communication technology. But the process have the inherent risk of information disclosure, so the PHI should be protected to ensure the reliability of healthcare services. In this paper, we designed encryption module for wearable personal health devices(PHD). A main goal is to guarantee that the real-time encoded and transmitted PHI cannot be allowed to be read, revised and utilized without user's permission. To achieve this, encryption algorithms as DES and 3DES were implemented in modules operating in Telos Rev B(16bit RISC, 8Mhz). And the experiments were performed in order to evaluate the performance of encryption and decryption using vital-sign measured by PHD. As experimental results, an block encryption was measured the followings: DES required 1.802 ms and 3DES required 6.683 ms. Also, we verified the interoperability among heterogeneous devices by testing that the encrypted data in Telos could be decoded in other machines without errors. In conclusion, the encryption module is the method that a PHD user is given the powerful right to decide for authority of accessing his PHI, so it is expected to contribute the trusted healthcare service distribution.