• Title/Summary/Keyword: High frequencies communication

Search Result 170, Processing Time 0.028 seconds

An Error-Tolerant Large Data Transmission between IoT Devices using Inaudible High-Frequencies (IoT 기기 간 비가청주파수를 활용한 대량의 데이터 전송에서의 오류 극복방법)

  • Park, Jong-Hyeok;Lee, Han-bum;Choi, Won-hoo;Yeom, Sanggil;Choo, Hyunseung
    • Proceedings of the Korea Information Processing Society Conference
    • /
    • 2015.10a
    • /
    • pp.341-342
    • /
    • 2015
  • 무선통신기술은 연결 중심의 IoT 시대에서 중요한 역할을 하고 있다. IoT 기기 간 데이터 통신을 위해 Bluetooth, NFC와 같은 기술이 활용되지만, 호환성의 문제가 있다. 비가청주파수를 활용한 데이터 통신 연구는 기존의 무선통신기술이 가지는 모듈 의존성, OS 종속성 문제를 해결하였다. 하지만 기존 연구 결과는 소량 데이터만 전송 가능하고, 데이터 전송량을 늘릴 경우 전송시간 대비 효율이 낮았다. 본 논문에서는 비가청주파수를 활용하여 대량의 비트를 여러 개의 프레임으로 나누어 연속적으로 전송하기 위한 통신 프로토콜을 제안한다. 이는 소량 데이터를 전송하는 기존 연구 결과의 높은 정확도와 함께 송신부와 수신부의 유기적인 상호작용을 통해 대량의 데이터 전송에 적합한 알고리즘이다.

Perceived Equity, Role Stress and Life Satisfaction of Married Working-Mother Salesclerks (판매직 주부의 공평성인지도 ${\cdot}$ 역할스트레스 및 생활만족도에 관한 연구)

  • Jeong, Jin-Hee;Lee, Jeong-Woo
    • Journal of the Korean Home Economics Association
    • /
    • v.43 no.2
    • /
    • pp.81-103
    • /
    • 2005
  • The main purpose of the research was to prove, in a practical sense, the relationship among perceived equity, role stress and life satisfaction of employed wives working in sales departments. The subjects were employed wives working in sales departments who have at least one child and a spouse, living in Seoul and the Metropolitan area. The final data analysis used 487 out of 668 questionnaires. Statistical analyses were carried out using SPSS/PC WIN which included frequencies, mean, percentages, Pearson's correlation, Cronbach's ${\alpha}$, factor analysis, multiple regression analysis. The findings of the study were as follows: 1) As their education level was low, the education level of their spouse was high, the communication level between couples was high, and the self-oriented perfectionism was low, their perceived emotional relationship was equal. As they were old, the communication level between couples was high, and the self-oriented perfectionism was low, their perceived position in sharing household chores was equal. On the other hand, as they were younger, the education level of their spouse was high, the reason for getting a job lay in supporting the family, and overtime hours worked, there was a higher level of role stress. 2) The influential variables which affect the life satisfaction, in order of importance, were communication level between couples, mother's role stress, age, non-financial reason of getting a job, and sharing household works. For relative contribution degree about life satisfaction, psychological variables among independent variables were revealed as the most influential ones. Thus, efficient communication between couples affected the life satisfaction to a great degree. Furthermore, the study proved that not only role stress variables but also perceived equity variables contributed to the life satisfaction.

The Apparel Product Purchasing Tendency of PC Communication and Internet Users in Home Shopping (PC 통신 및 인터넷 이용자의 통신판매를 통한 의류제품 구매성향)

  • 이은진;홍병숙
    • Journal of the Korean Society of Clothing and Textiles
    • /
    • v.23 no.7
    • /
    • pp.1007-1018
    • /
    • 1999
  • The purpose of this study were : 1) to examine the apparel product purchasing tendency of PC communication and internet users in home shopping 2) to analyze the difference of apparel product purchasing tendency accordint to consumer factors. The data was administered to 160 subjects who had communicated the PC communication and internet. And the data was collected from May through August in 1998. SPSS package was used for analysis and the following methods such as Means Percentage Frequencies Factor analysis Crosstabulation analysis t-test and one-way ANOVA, The results of this study were as follows : 1) The users of PC communication and internet were young and high-education level and a metropolitan area dwellers. They received a purchase offer through catalog PC communication and internet cable TV and paid out credit card Experience to purchasing apparel product of home shopping was very low but intention to purchasing was relative high. item that consumer wanted to buy using home shopping were casual clothing and fashion goods which were not important to fit and without regard to style. 2) Between purchasing apparel product of home shopping and mainly consideration factors were shown to have the significant differences according to age residential quarters whether or not marriage. income level. A metropolitan area dwellers the low-age unmarried and the low-income groups thought much of convenience shopping time and effort's saving. A person of the higher-income and the married thought much of the facility of an exchange or returned goods. A region dwellers were to purchase a speciality product or gift goods. 3) Between purchasing apparel product of home shopping and satisfaction degree were shown to have significant differences according to sex whether or not marriage education level an occupation. The woman than the man was satisfied with the benefit of the shopping time and effort's saving. And the unmarried than the married was satisfied with the benefit of the home shopping's convenience. The higher-education level than the lower-education level was satisfied with the quality guarantee of the product.

  • PDF

TSV Fault Detection Technique using Eye Pattern Measurements Based on a Non-Contact Probing Method (Eye 패턴을 사용한 비접촉 형태의 TSV 고장 검출 기법)

  • Kim, Youngkyu;Han, Sang-Min;Ahn, Jin-Ho
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.64 no.4
    • /
    • pp.592-597
    • /
    • 2015
  • 3D-IC is a novel semiconductor packaging technique stacking dies to improve the performance as well as the overall size. TSV is ideal for 3D-IC because it is convenient for stacking and excellent in electrical characteristics. However, due to high-density and micro-size of TSVs, they should be tested with a non-invasive manner. Thus, we introduce a TSV test method on test prober without a direct contact in this paper. A capacitive coupling effect between a probe tip and TSV is used to discriminate small TSV faults like voids and pin-holes. Through EM simulation, we can verify the size of eye-patterns with various frequencies is good for TSV test tools and non-contact test will be promising.

Analysis of Total Harmonic Distortion in Microspeaker Considering Coupling Effect (연성 효과를 고려한 마이크로스피커 왜율분석)

  • Kwon, Joong-Hak;Kim, Kwang-Suk;Bang, Ki-Chang;Hwang, Sang-Moon
    • Transactions of the Korean Society for Noise and Vibration Engineering
    • /
    • v.18 no.4
    • /
    • pp.473-479
    • /
    • 2008
  • With the advent of mobile phone, digital multimedia broadcasting(DMB) service is to be realized for multimedia data communication. For an acoustic part, a smaller and lighter microspeaker is also soon to be realized as an MP3 song player and a speakerphone. Sound quality in the microspeaker is becoming more important in mobile phones. It is evaluated by total harmonic distortion(THD). THD is the proportion of higher order frequencies output response to sinusoidal input signal. It is affected by uneven magnetic distribution and nonlinear response of diaphragm. In this paper, harmonic distortion is analyzed by considering magnetic and mechanical coupling effects. Simulated results of THD are compared with experimental data. Results show that THD in lower frequency range is higher due to high displace on voice coil and high mechanical response of high order frequency.

Analysis of total harmonic distortion in microspeaker considering coupling effect (연성 효과를 고려한 마이크로스피커 왜율분석)

  • Kwon, Joong-Hak;Kim, Kwang-Suk;Bang, Ki-Chang;Hwang, Sang-Moon
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
    • /
    • 2008.04a
    • /
    • pp.236-241
    • /
    • 2008
  • With the advent of mobile phone, Digital multimedia broadcasting (DMB) service is to be realized for multimedia data communication. For an acoustic part, a smaller and lighter microspeaker is also soon to be realized as an MP3 song player and a speakerphone. Sound quality in the microspeaker is becoming more important in mobile phones. It is evaluated by total harmonic distortion (THD). THD is the proportion of higher order frequencies output response to sinusoidal input signal. It is affected by uneven magnetic distribution and nonlinear response of diaphragm. In this paper, harmonic distortion is analyzed by considering magnetic and mechanical coupling effects. Simulated results of THD are compared with experimental data. Results show that THD in lower frequency range is higher due to high displace on voice coil and high mechanical response of high order frequency.

  • PDF

Electromagnetic Interference Analysis of an Inhomogeneous Electromagnetic Bandgap Power Bus for High-Speed Circuits

  • Cho, Jonghyun;Kim, Myunghoi
    • Journal of information and communication convergence engineering
    • /
    • v.15 no.4
    • /
    • pp.237-243
    • /
    • 2017
  • This paper presents an analysis of the electromagnetic interference of a heterogeneous power bus where electromagnetic bandgap (EBG) cells are irregularly arranged. To mitigate electrical-noise coupling between high-speed circuits, the EBG structure is placed between parallel plate waveguide (PPW)-based power buses on which the noise source and victim circuits are mounted. We examine a noise suppression characteristic of the heterogeneous power bus in terms of scattering parameters. The characteristics of the dispersion and scattering parameters are compared in the sensitivity analysis of the EBG structure. Electric field distributions at significant frequencies are thoroughly examined using electromagnetic simulation based on a finite element method (FEM). The noise suppression characteristics of the heterogeneous power bus are demonstrated experimentally. The heterogeneous power bus achieves significant reduction of electrical-noise coupling compared to the homogeneous power buses that are adopted in conventional high-speed circuit design. In addition, the measurements show good agreement with the FEM simulation results.

A High Current Efficiency CMOS LDO Regulator with Low Power Consumption and Small Output Voltage Variation

  • Rikan, Behnam Samadpoor;Abbasizadeh, Hamed;Kang, Ji-Hun;Lee, Kang-Yoon
    • Journal of IKEEE
    • /
    • v.18 no.1
    • /
    • pp.37-44
    • /
    • 2014
  • In this paper we present an LDO based on an error amplifier. The designed error amplifier has a gain of 89.93dB at low frequencies. This amplifier's Bandwidth is 50.8MHz and its phase margin is $59.2^{\circ}C$. Also we proposed a BGR. This BGR has a low output variation with temperature and its PSRR at 1 KHz is -71.5dB. For a temperature variation from $-40^{\circ}C$ to $125^{\circ}C$ we have just 9.4mV variation in 3.3V LDO output. Also it is stable for a wide range of output load currents [0-200mA] and a $1{\mu}F$ output capacitor and its line regulation and especially load regulation is very small comparing other papers. The PSRR of proposed LDO is -61.16dB at 1 KHz. Also we designed it for several output voltages by using a ladder of resistors, transmission gates and a decoder. Low power consumption is the other superiority of this LDO which is just 1.55mW in full load. The circuit was designed in $0.35{\mu}m$ CMOS process.

Wireless Data Transmission Algorithm Using Cyclic Redundancy Check and High Frequency of Audible Range (가청 주파수 영역의 고주파와 순환 중복 검사를 이용한 무선 데이터 전송 알고리즘)

  • Chung, Myoungbeom
    • KIPS Transactions on Computer and Communication Systems
    • /
    • v.4 no.9
    • /
    • pp.321-326
    • /
    • 2015
  • In this paper, we proposed an algorithm which could transmit reliable data between smart devices by using inaudible high frequency of audible frequency range and cyclic redundancy check method. The proposed method uses 18 kHz~22 kHz as high frequency which inner speaker of smart device can make a sound in audible frequency range (20 Hz~22 kHz). To increase transmission quantity of data, we send mixed various frequencies at high frequency range 1 (18.0 kHz~21.2 kHz). At the same time, to increase accuracy of transmission data, we send some mixed frequencies at high frequency range 2 (21.2 kHz~22.0 kHz) as checksum. We did experiments about data transmission between smart devices by using the proposed method to confirm data transmission speed and accuracy of the proposed method. From the experiments, we showed that the proposed method could transmit 32 bits data in 235 ms, the transmission success rate was 99.47%, and error detection by using cyclic redundancy check was 0.53%. Therefore, the proposed method will be a useful for wireless transmission technology between smart devices.

Low-power Hardware Design of Deblocking Filter in HEVC In-loop Filter for Mobile System (모바일 시스템을 위한 저전력 HEVC 루프 내 필터의 디블록킹 필터 하드웨어 설계)

  • Park, Seungyong;Ryoo, Kwangki
    • Journal of the Korea Institute of Information and Communication Engineering
    • /
    • v.21 no.3
    • /
    • pp.585-593
    • /
    • 2017
  • In this paper, we propose a deblocking filter hardware architecture for low-power HEVC (High-Efficiency Video Coding) in-loop for mobile systems. HEVC performs image compression on a block-by-block basis, resulting in blockage of the image due to quantization error. The deblocking filter is used to remove the blocking phenomenon in the image. Currently, UHD video service is supported in various mobile systems, but power consumption is high. The proposed low-power deblocking filter hardware structure minimizes the power consumption by blocking the clock to the internal module when the filter is not applied. It also has four parallel filter structures for high throughput at low operating frequencies and each filter is implemented in a four-stage pipeline. The proposed deblocking filter hardware structure is designed with Verilog HDL and synthesized using TSMC 65nm CMOS standard cell library, resulting in about 52.13K gates. In addition, real-time processing of 8K@84fps video is possible at 110MHz operating frequency, and operation power is 6.7mW.