• Title/Summary/Keyword: Device to Device (D2D)

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A Study on the exhaust gas characteristics of the vehicle gasoline according to the ambient temperature (대기온도에 따른 휘발유 자동차의 배출가스 특성에 관한 연구)

  • Lim, Jae-Hyuk;Kim, Ki-Ho;Kim, Sung-Woo;Lee, Min-Ho;Oh, Sang-Gi
    • Journal of Power System Engineering
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    • v.19 no.6
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    • pp.47-53
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    • 2015
  • Korea is the geographic location during the summer, the temperature rising to $35^{\circ}C$ and winter temperature is $-15^{\circ}C$ to reduce the air temperature changes, such as relatively large compared to other countries. This increase or decrease of the harmful exhaust gas discharged from automobile substantially inconvenience a significant impact on the active side of the car engine temperature and exhaust gas reducing device receives a large impact on the atmospheric temperature is regulation to be different. However, domestic vehicle emissions test temperature of $20{\sim}30^{\circ}C$ is it does not reflect this situation the actual test temperature to accurately measure the exhaust gas volume of the vehicle is difficult. In this study, domestic automobile exhaust gas test conditions of a test temperature $20{\sim}30^{\circ}C$ various temperatures, including (35, 25, 0, -7, -15, $-25^{\circ}C$) under the two vehicles (2.0L MPI, 2.4 L GDI) as was discussed with respect to the exhaust gas characteristics of the vehicle according to the ambient temperature gas. As a result, domestic emissions test temperature of $25^{\circ}C$ than average conditions were temperature decreases greenhouse gas emissions and increase overall increased by up to 15 times higher. Air temperature and the engine exhaust gas inconvenience a direct effect on the activation temperature required in the reduction unit is determined to be an increase of emissions and greenhouse gases, and also an increase in the variety of lubricants based lubricating and viscosity reduction, such as the engine oil due to the low temperature of these result It is considered that shows the.

Design of a RF fixed phase control circuit using I&Q Demodulator (I&Q Demodulator를 이용한 RF 고정 위상 제어기 설계)

  • Park, Ung-Hee;Chang, Ik-Soo;Huh, Jun-Won;Gang, In-Ho
    • Journal of the Korean Institute of Telematics and Electronics D
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    • v.36D no.1
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    • pp.8-14
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    • 1999
  • The active devices used at microwave frequency have the different phase shift according to input power. Especially, The difference of the phase shift is large in the saturation region of the amplifier. In this paper, we disigned the phase control system for fixing the different phase shift at device. With the high frequency nonlinear amplifier, we fabricated such system that the phase shift to be fixed automatically using the varible phase shifter. The variable phase shifter fixed total phase variation of the circuit using the information that was obtained from the comparison of imputsignal phase with output signal phase. Even though the input signal is 2-tone or FM type, we could estimate and also fix the phase variation on DUT Dynamic range is about 10dB. It has been experimented at 1960MHz using Teflon (H=31mil, ${\varepsilon}r$=3.2)

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PARENTS EDUCATION OF ORAL HYGIENE USING QLF-D IN PATIENTS FOR SPECIAL HEALTH CARE NEEDS (QLF-D를 이용한 장애 아동 보호자의 구강위생관리 교육 : 증례보고)

  • Lim, So Young;Lee, Koeun;Choi, Byung-Jai;Lee, Jae-Ho
    • The Journal of Korea Assosiation for Disability and Oral Health
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    • v.13 no.2
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    • pp.99-103
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    • 2017
  • The primary responsibility for the oral hygiene of the disabled is usually the parents. Dental care of the disabled is early detection and recovery of lesions and continuous management. For this to be successful it is necessary to use diagnostic tool that can detect the early stages of dental caries which is difficult to detect with the naked eye. It is also important to educate and motivate the caregivers on oral hygiene management. Quantitative Light-induced Fluorescence-Digital (Billuminator, Inspektor Researh Systems BV, Amsterdam, The Netherlands), which provides overall caries inspection and visual information, can be useful for caregiver education. A 3-year-old girl who was hospitalized with Pallister-Killian syndrome, Hypothyroidism visited our clinic with chief complaint of rugged upper incisors. This girl had multiple dental caries and oral hygiene was very poor. Periodic QLF-D images were taken to provide caregiver education and oral hygiene management was improved. A 13-year-old girl with cerebral palsy visited our clinic for regular check up. Using QLF-D, we explained to the parents that there is a need for treatment of dental caries, and education of oral hygiene management was conducted. Improvement of oral hygiene in the disabled can be achieved through caregiver education. QLF-D is a diagnostic device that can detects early caries by irradiating light in the visible ray area to the teeth. It can also detects microleakage of restoration, plaque and calculus without disclosing agent. Clinicians can use the QLF-D to perform a general oral examination for the disabled. Also, QLF-D can be used to store visual information and educate caregivers. The accumulation of information using QLF-D makes it possible to provide feedback on oral care of parents, which is more advantageous for caregivers education.

Optimize KNN Algorithm for Cerebrospinal Fluid Cell Diseases

  • Soobia Saeed;Afnizanfaizal Abdullah;NZ Jhanjhi
    • International Journal of Computer Science & Network Security
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    • v.24 no.2
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    • pp.43-52
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    • 2024
  • Medical imaginings assume a important part in the analysis of tumors and cerebrospinal fluid (CSF) leak. Magnetic resonance imaging (MRI) is an image segmentation technology, which shows an angular sectional perspective of the body which provides convenience to medical specialists to examine the patients. The images generated by MRI are detailed, which enable medical specialists to identify affected areas to help them diagnose disease. MRI imaging is usually a basic part of diagnostic and treatment. In this research, we propose new techniques using the 4D-MRI image segmentation process to detect the brain tumor in the skull. We identify the issues related to the quality of cerebrum disease images or CSF leakage (discover fluid inside the brain). The aim of this research is to construct a framework that can identify cancer-damaged areas to be isolated from non-tumor. We use 4D image light field segmentation, which is followed by MATLAB modeling techniques, and measure the size of brain-damaged cells deep inside CSF. Data is usually collected from the support vector machine (SVM) tool using MATLAB's included K-Nearest Neighbor (KNN) algorithm. We propose a 4D light field tool (LFT) modulation method that can be used for the light editing field application. Depending on the input of the user, an objective evaluation of each ray is evaluated using the KNN to maintain the 4D frequency (redundancy). These light fields' approaches can help increase the efficiency of device segmentation and light field composite pipeline editing, as they minimize boundary artefacts.

Development of Supportive Device Design for Artificial Hand Based on Virtual Simulation (가상 시뮬레이션을 이용한 의수 보조 장치 디자인 개발)

  • Lee, Ji-Won;Han, Ji-Young;Na, Dong-Kyu;Nah, Ken
    • Journal of Digital Convergence
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    • v.15 no.10
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    • pp.455-465
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    • 2017
  • This study focuses on design development and verification through virtual simulation based on 3D model data in the cloud platform as a method of utilization of engineering technology of design in the fourth industrial revolution era. The goal of research is to develop and examine a design for the needs of the target that has never been met before through virtual simulations that can be conducted in practice. As a research method, we analyzed secondary data to identify the needs of the target, and did literature research for the ergonomic data and target body development stages. In addition, the design development process of this study was shown meaningful result in design, structure, safety, material, durability through loop test of 7 virtual simulations. This study can be applied to the automated process system based on 3D model data in the 4th industrial revolution era and can be used as an element of the cyber physics system for the additional research.

A Surface Treatment Technique for Interim Crown Fabricated by Three-Dimensional Printing with Digital Light-Processing Technology

  • Son, Keunbada;Lee, Jaesik;Lee, Kyu-Bok
    • Journal of Korean Dental Science
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    • v.14 no.2
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    • pp.79-89
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    • 2021
  • Purpose: The technique introduced in this study describes a technique for surface treatment that applies a photocuring resin to the surface of an interim crown fabricated by three-dimensional (3D) printing without a conventional polishing method. The purpose of this study was to evaluate marginal and internal fit and the intaglio surface trueness of interim crowns after surface treatment of 3D-printed crowns for clinical application. Materials and Methods: An interim crown was fabricated using a 3D printer with digital light-processing technology, and the surface support was removed. After the posttreatment process, the resin was thinly applied to the surface of the interim crown and polymerized to solve the esthetic problem of the surface without the conventional polishing process. In addition, the marginal and internal fits were measured to verify the clinical use of this technique, and the trueness was evaluated to confirm the deformation of the inner surface according to the technical application of the outer surface of the interim crown. The difference before and after the evaluation by a statistical method was verified using an independent t-test (α=0.05). Result: There was no significant difference in the marginal and internal fit before and after the application of this technique (P>0.05). There was no significant difference in intaglio surface trueness before and after the application of this technique (P=0.963). Conclusion: There was no change in the marginal and internal fit or in intaglio surface trueness of the interim crowns to which this technology was applied. This surface treatment technique is a more convenient method for interim crowns fabricated using 3D-printing technology without the conventional polishing process.

High-Isolation SPDT RF Switch Using Inductive Switching and Leakage Signal Cancellation

  • Ha, Byeong Wan;Cho, Choon Sik
    • Journal of electromagnetic engineering and science
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    • v.14 no.4
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    • pp.411-414
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    • 2014
  • A switch is one of the most useful circuits for controlling the path of signal transmission. It can be added to digital circuits to create a kind of gate-level device and it can also save information into memory. In RF subsystems, a switch is used in a different way than its general role in digital circuits. The most important characteristic to consider when designing an RF switch is keeping the isolation as high as possible while also keeping insertion loss as low as possible. For high isolation, we propose leakage signal cancellation and inductive switching for designing a singlepole double-throw (SPDT) RF switch. By using the proposed method, an isolation level of more than 23 dB can be achieved. Furthermore, the heterojunction bipolar transistor (HBT) process is used in the RF switch design to keep the insertion loss low. It is demonstrated that the proposed RF switch has an insertion loss of less than 2 dB. The RF switch operates from 1 to 8 GHz based on the $0.18-{\mu}m$ SiGe HBT process, taking up an area of $0.3mm^2$.

Recent R&D Trends of Solid Oxide Fuel Cell Power Generation System (고체산화물 연료전지 발전시스템의 최근 연구 개발 동향)

  • Pyo, Seong-Soo;Lim, Tak-Hyoung;Lee, Seung-Bok;Park, Seok-Joo;Song, Rak-Hyun;Shin, Dong-Ryul
    • Journal of the Korean Electrochemical Society
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    • v.12 no.2
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    • pp.119-130
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    • 2009
  • This article reviews recent R&D trends in SOFC development with an emphasis on industries that can produce the SOFC stack and power generation system. SOFC is an electrochemical device that can convert the chemical energy of fuel into the electrical energy with environment friendly system and high efficiency. SOFC power generation system could be classified as the portable power generation system, auxiliary power unit(APU), residential power generation(RPG) and large size distributed power generation. In the case of more than 10kW system, the major R&D trends are focused on the tubular type SOFC system with high efficient and long term stability to meet the commercialization of SOFC power generation system.

Study on Virtual Reality (VR) Operating System Prototype (가상환경(VR) 운영체제 프로토타입 연구)

  • Kim, Eunsol;Kim, Jiyeon;Yoo, Eunjin;Park, Taejung
    • Journal of Broadcast Engineering
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    • v.22 no.1
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    • pp.87-94
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    • 2017
  • This paper presents a prototype for virtual reality operating system (VR OS) concept with head mount display (HMD) and hand gesture recognition technology based on game engine (Unity3D). We have designed and implemented simple multitasking thread mechanism constructed on the realtime environment provided by Unity3D game engine. Our virtual reality operating system receives user input from the hand gesture recognition device (Leap Motion) to simulate mouse and keyboard and provides output via head mount display (Oculus Rift DK2). As a result, our system provides users with more broad and immersive work environment by implementing 360 degree work space.

Electromagnetic Interference Shielding Effectiveness of Hybrid Conductive Fabrics (하이브리드 전도성 직조섬유의 전자파 차폐효과)

  • Han, Gil-Young;Kim, Ki-Yeol;Yun, Tae-Soon
    • Journal of the Korean Society of Manufacturing Process Engineers
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    • v.14 no.2
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    • pp.81-86
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    • 2015
  • This study investigated electromagnetic interference (EMI) shielding effectiveness (SE) of hybrid conductive fabrics. The coaxial transmission line method was used to measure the EMI Shielding effectiveness of the conductive fabrics. We designed and constructed a measuring system, consisting of a network analyzer and a device that serves as a sample holder and at the same time as a transmission medium of incident electromagnetic waves. The measurements of SE were carried out in a frequency range from 100 MHz to 2 GHz. The results of the EMI shielding experiments showed that the maximum electromagnetic shielding effectiveness (EMSE) values of sandwich type C/A/C (carbon fiber sheet/aluminum foil tape/carbon fiber sheet) and C/Ni/C (carbon fiber sheet/magnetic shielding foil/carbon fiber sheet) samples were 55 dB and 113 dB, respectively, at a frequency of 1.9 GHz.