• 대한전기학회:학술대회논문집
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• 대한전기학회 2007년도 제38회 하계학술대회
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• pp.1585-1586
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• 2007

In this paper, a system of durability test for ATPS(Automatic Transmission Position Switch), which is used for automatic transmission, has been developed. ATPS is the position sensor for an automatic transmission which transforms the gear changes into the electrical signals and transmits them to TCU(Transmission Control Unit). This system can detect the output signals of the sensor, and also it has been designed to control the position and velocity of a motor to realize the sensor's movement under the running state of a car. And a database system and a GUI system have been developed for the systematic output data management and the convenient interface for users. Also, the operation data and the inspection reference data of a motor can be easily changed in this system, and with some modification the system is also able to used for the durability test of the similar products.

• 인터넷정보학회논문지
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• 제20권2호
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• pp.21-27
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• 2019

The terrestrial ATSC 3.0 broadcasting system, which is capable of converging broadcast and communication services, uses IP based technology for data transmission between broadcasting equipment. In addition, data transmission between broadcasting equipment uses IP-based technology like existing wired communication network, which has advantageous in terms of equipment construction and maintenance In case IP based data transmission technology is used, however, it may inevitably cause an error that a packet is lost during transmission depending on the network environments. In order to cope with a broadcasting accident caused by such a transmission error or a malfunction of a broadcasting apparatus, a broadcasting system is generally configured as a duplication, which can transmit a normal packet when various types of error may occur. By this reason, correction method of error packets and intelligent switching technology are essential. Therefore, in this paper, we propose a design and implementation of intelligent IP switch for Ensuring Reliability of ATSC 3.0 Broadcast Streams. The proposed intelligent IP consists of IP Stream Analysis Module, ALP Stream Analysis Module, STL Stream Analysis Module and SMPTE 2022-1 based FEC Encoding/Decoding Module.

• 한국소음진동공학회:학술대회논문집
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• 한국소음진동공학회 2007년도 춘계학술대회논문집
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• pp.701-705
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• 2007

The equipment noise of machine room that generates at the building where human-being is living, is becoming to an object of strong civil appeal, and because it influences to the residential space through the floor or wall, its damage is very serious level. Accordingly, while an efficient forming of the sound insulating measures is earnest, as most of the transmission loss data was the material measured in laboratory, in case when it was applied to the job site, due to the precision difference of constructing work and the influence of detoured transmitting sound, the case of disaccord is the most. Therefore, this thesis has intended to present a fundamental data for an efficient establishment of sound insulation measure, by means of comparison analysis with the existing transmission loss data, after measurement of the transmission loss on the object of various walls, at the construction equipment machinery room.

• 한국통신학회논문지
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• 제41권11호
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• pp.1589-1597
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• 2016

본 논문에서는 사막, 해양과 같은 개활지역에서 모바일 센서 네트워크에서 사용하는 전력량을 감소시킬 수 있는 시스템을 제안한다. 무선 센서 네트워크에서 데이터 전송 전력 소모는 거리의 제곱에 비례하다는 특징이 있다. 따라서 배터리로 동작하는 모바일 센서의 위치가 센서 데이터를 수집하는 싱크 노드와 멀리 떨어져 있을 경우, 데이터를 전송하는데 요구되는 전력 사용량이 높아지게 되어 센서의 동작 시간이 짧아지는 문제가 발생한다. 이에 따라 본 논문에서는 기존 모바일 센서의 전송 가능 거리보다 짧은 전송 거리를 설정하여 센서가 해당 거리 이내에 존재할 때만 데이터를 보내게 함으로써 필요한 전력량을 감소시키는 시스템에 대하여 제안하였다. 뿐만 아니라, 싱크노드에서는 압축 센싱을 이용하여 센서로부터 수집한 데이터를 더 적은 전송 횟수로 게이트웨이에 전송함으로써 전체 네트워크의 에너지 효율을 증가시켰다. 본 논문에서 제안한 시스템은 라즈베리 파이와 아두이노를 이용하여 실제로 구현하였으며, 싱크노드로부터 적은 데이터를 수신하여도 게이트웨이에서 원 데이터와 매우 근사적으로 복호가 가능함을 실험을 통하여 확인하였고 실제 실험 환경에서 제안된 시스템의 성능을 이론적으로 검증하였다.

• Journal of information and communication convergence engineering
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• 제8권1호
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• pp.40-44
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• 2010

opportunistic spectrum access (OSA) allows unlicensed users to share licensed spectrum in space and time with no or little interference to primary users, with bring new research challenges in MAC design. We propose a cognitive MAC protocol using statistical channel information and selecting appropriate idle channel for transmission. The protocol based on the CSMA/CA, exploits statistics of spectrum usage for decision making on channel access. Idle channel availability, spectrum hole sufficiency and available channel condition will be included in algorithm statistical information. The model include the control channel and data channel, the transmitter negotiates with receiver on transmission parameters through control channel, statistical decision results (successful rate of transmission) from exchanged transmission parameters of control channel should pass the threshold and decide the data transmission with spectrum hole on data channel. A dynamical sensing range as a important parameter introduced to maintain the our protocol performance. The proposed protocol's simulation will show that proposed protocol does improve the throughput performance via traditional opportunistic spectrum access MAC protocol.

• 한국산업융합학회 논문집
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• 제23권1호
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• pp.41-48
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• 2020

Currently, the industry uses MODBUS communication method using RS485 as a communication method used when constructing distributed equipment and networks. However, this method has a rather good transmission and reception distance, but has a disadvantage of being a half-duplex communication method. Therefore, there is a great need for a full-duplex communication method that can simultaneously transmit and receive two-wire communications. Therefore, in this paper, we propose a new communication hardware equipment that can implement full-duplex communication method by communication signal level to overcome the disadvantage of communication speed. The proposed communication hardware is a structure that can transmit and receive at the same time on the same communication line in two equipments communicating in a two-wire system. The characteristic of this communication hardware is that the transmitter generates two-level signal for data transmission, but the receiver generates three-level electric signal according to the status of the transmission data generated by the receiver. The data transmission signal information of the receiver is present at the same time. Therefore, the receiving side can analyze the received signal based on the information on the current transmission signal and can analyze the signal only in the two communicating devices, so it can be seen that the communication security is very excellent.

• Wind and Structures
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• 제31권1호
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• pp.21-29
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• 2020

The wind field measurement of severe winds such as hurricanes (or typhoons), thunderstorm downbursts and other gales is important issue in wind engineering community, both for the construction and health monitoring of the wind-sensitive structures. Although several wireless data transmission systems have been available for the wind field measurement, most of them are not specially designed for the wind data measurement in structural wind engineering. Therefore, the field collection is still dominant in the field of structural wind engineering at present, especially for the measurement of the long-term and high-frequency wind speed data. In this study, for remote wind field measurement, a novel wireless long-term and high-frequency wind data acquisition system with the functions such as remote control and data compression is developed. The system structure and the collector are firstly presented. Subsequently, main functions of the collector are introduced. Also novel functions of the system and the comparison with existing systems are presented. Furthermore, the performance of this system is evaluated. In addition to as the wireless transmission for wind data and hardware integration for the collector, the developed system possesses a few novel features, such as the modification of wind data collection parameters by the remote control, the remarkable data compression before the data wireless transmission and monitoring the data collection by the cell phone application. It can be expected that this system would have wide applications in wind, meteorological and other communities.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제7권3호
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• pp.446-458
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• 2013

Recently, energy-efficient cellular transmission has received considerable research attention to improve the energy efficiency of wireless communication. In this paper, we consider a cellular network consisting of one base station (BS) and multiple user terminals and explore the network coding for enhancing the energy efficiency of cellular downlink transmission from BS to users. We propose the network coded cellular transmission scheme and conduct its energy consumption analysis with target outage probability and data rate requirements in Rayleigh fading environments. Then, the energy efficiency in Bits-per-Joule is further defined and analyzed to evaluate the number of bits delivered per Joule of energy cost. Numerical results show that the network coded cellular transmission significantly outperforms the traditional cellular transmission in terms of energy efficiency, implying that given a Joule of energy cost, the network coded cellular transmission scheme can deliver more bits than the traditional cellular transmission.

• 한국정보통신학회논문지
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• 제14권5호
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• pp.1311-1321
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• 2010

주변환경에서 정보를 수집하는 센서네트워크는 다양한 분야에서 사용되고 있다. 정밀한 분석을 위하여 매우 짧은 주기로 정보를 수집할 필요가 있는 어플리케이션에서는 네트워크를 구성하는 노드의 수가 증가하고 정보를 수집하는 주기가 짧아질수록 생성되는 데이터의 양도 증가하기 때문에 노드 간에 지연을 최소화하여 효율성을 높일 필요가 있다. 본 논문에서는 네트워크 구성시 데이터 전송률에 영향을 미치는 전송주기와 센서 노드간의 거리, 전송 패킷의 크기에 대한 실험을 실시하여 실험한 결과를 바탕으로 주기적 전송 기법의 한계와 문제점을 분석하고 패킷 전송 작업이 완료되었음을 알려주는 전송 완료 이벤트를 이용하여 연속적인 패킷 전송시 지연을 줄여주는 SET(SendDone Eventbased Transmission Technique)기법을 제안한다. SET에서는 패킷 전송이 완료된 시점에 즉시 다음 패킷을 전송하기 때문에 패킷을 전송하는데 소요되는 시간에 상관없이 패킷 전송간에 지연이 발생하지 않는다. 따라서 연속적으로 대량의 패킷을 전송할 때 높은 전송율을 제공할 수 있다.

• 한국정보통신학회논문지
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• 제12권7호
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• pp.1180-1186
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• 2008

본 논문에서는 고속 데이터 전송을 위한 고차 모드 신호의 양호한 위성 전송에 요구되는 수신 단말기의 저잡음 증폭 주파수 변환기의 위상 잡음 특성을 해석한다. 위상 잡음은 낮은 데이터 전송뿐만 아니라 고속 데이터 전송을 위한 고차 모드 신호 전송에 심각한 영향을 미치며, 전송 링크 주파수가 증가함에 따라 위상 잡음이 증가하여 고속 데이터 전송에 요구되는 고차 모드와 높은 주파수 사용으로 인한 전송 열화 성능은 증가한다. 따라서, 높은 주파수 영역을 갖는 고차 모드 수신 단말기의 저잡음 증폭 주파수 변환기의 위상 잡음은 전송 성능에 지배적인 영향을 가지므로, 저잡음 증폭 주파수 변환기 위상 잡음에 대한 가용 전송 모드를 해석하고 가용 서비스 적용 방법을 제시한다.