• 한국생활과학회지
• /
• 제24권4호
• /
• pp.513-529
• /
• 2015

This study performed corroborative analysis by establishing hypothesis so as to corroboratively define the effect on brand attitude of psychological risk recognition in the case where consumers reading negative media news related to bakery recognize crisis communication on the basis of which point. According to corroborative analysis, the role of psychological crisis perception as parameter is confirmed in the causal relation between crisis communication recognition and brand attitude. Such result of study confirms that the positive change in crisis communication recognition reduces psychological risk perception to bakery products and such psychological risk perception eventually become factor which affects brand attitude over products. Such result of study suggests that when reading negative media news on bakery, the influence on consumer's evaluation of news on the basis of certain point and the influence on the formation of causal relation between psychological risk perception and brand attitude has scientific ground. In the aspect, the main result of this study is to find the clue that when comparing precedent study between crisis communication recognition and brand attitude, psychological risk perception is realized with brand attitude as media by verifying the parameter role of psychological risk perception.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 1987년도 정기총회 및 창립40주년기념 학술대회 학회본부
• /
• pp.109-113
• /
• 1987

This paper briefly introduces a strategy of data links between EMS and SCADA systems for the KEPCO's EMS project. For the data links, front end/communication processors are adopted that provide for protocol conversion and communication processing in parallel with EMS/SCADA processing. The data link configuration for a communication channel is point to point links. The EMS - hardware and software - has capability of handling links utilizing both bisync protocol and X.25 (Level 1 and 2)protocol for the data link protocol.

• 대한전기학회:학술대회논문집
• /
• 대한전기학회 2007년도 제38회 하계학술대회
• /
• pp.1215-1217
• /
• 2007

This paper is proposed a novel method to approximate the maximum power for a photovoltaic inverter system. It is designed for power systems application and utilities. The proposed Maximum Power Point Tracking(MPPT) control has the advantage to provide a new simple way to approximate the optimal or rated voltage, the optimal or rated current and maximum power rating produced by a solar panel and the photovoltaic inverter. And this straightforward method will be named linear reoriented coordinates method(LRCM) with the advantage that Pmax and $V_{op}$ can be approximated using the same variable as the dynamic model without using complicate approximations or Taylor series. This paper is proposed MPPT using LRMC method using weather condition of domestic moderate program technique. This paper is proposed the experimental results to verify the effectiveness of the new methods.

• 한국전자통신학회논문지
• /
• 제13권6호
• /
• pp.1169-1176
• /
• 2018

드론 제어를 위한 C대역 무지향성 안테나는 드론의 상부 또는 하부에 장착되어 통신링크를 구성하기 위해 사용된다. 통신링크는 무지향성 안테나 장착위치에 따라 LOS(: Line Of Sight)의 영향을 받게 된다. 본 논문에서는 드론 탑재를 위한 내장형 안테나 2종을 상용 시뮬레이션 툴인 CST MWS로 설계하고, 장착 환경을 고려한 EM(: Electro Magnetic) 해석을 수행하였다. 또한, 다수의 드론을 제어하기 위한 PTMP(: Point To Multi Point) 지상안테나를 제안하였다. 지상안테나는 30km의 통신반경을 갖기 위해 수평방향으로 4개의 섹터안테나와 상부에 1개의 지향성안테나로 구성하였다.

• 한국인터넷방송통신학회논문지
• /
• 제13권3호
• /
• pp.135-140
• /
• 2013

본 연구에서는 매립장의 체적관리를 위한 체적 모니터링 시스템 구현에 대한 연구에 대해 논의한다. 레이저 로봇 기술에 기반한 삼차원 스캐너를 제작하여 삼차원 물체의 표면에 대한 포인트 클라우드(point cloud)를 이용한 매립장의 쓰레기 체적 감시 시스템을 제안하였다. 이를 통해 연속적으로 매립장의 쓰레기 체적 변화를 감시할 수 있게 되었으며 매립장 수명의 가용한 쓰레기 매립 수명을 예측할 수 있게 되었다. 그리고 완성된 매립장 체적 감시 시스템은 안성시 매립장에 구현되었다.

• Journal of Communications and Networks
• /
• 제11권3호
• /
• pp.240-247
• /
• 2009

The results of performance analysis by adopting the channel scenarios characterized as Weibull fading for an multicarrierdirect sequence-coded division multiple access (MC-DS-CDMA) system are proposed in this investigation. On the other hand, an approximate simple expression with the criterion of bit error rate (BER) versus signal-to-noise ratio (SNR) method is derived for an MC-DS-CDMA system combining with maximal ratio combining (MRC) diversity based on the moment generating function (MGF) formula of Weibull statistics, and it associates with an alternative expression of Gaussian Q-function. Besides, the other point of view on the BER performance evaluation of an MC-DS-CDMA system is not only the assumption of both single-user and multi-user cases applied, but the phenomena of partial band interference (PBI) is also included. Moreover, in order to validate the accuracy in the derived formulas, some of the system parameters, such as Weibull fading parameter (${\beta}$), user number (K), spreading chip number (N), branch number (L), and the PBI (JSR) values, etc., are compared with each other in the numerical results. To the best of author's knowledge, it is a brand new idea which proposes the evaluation of the system performance for an MC-DS-CDMA system over the point of view with Weibull fading channel.

• International Journal of Internet, Broadcasting and Communication
• /
• 제13권3호
• /
• pp.84-91
• /
• 2021

The purpose of this study is to investigate the structural relationship between resort selection attributes, emotional responses, and empirical values of scuba diving participants. The general population who enjoys scuba diving in Korea was selected as the population. Using the convenience sampling method, 553 of the 600 questionnaire samples were extracted as the final valid sample. For data processing, frequency analysis, exploratory factor analysis, and Cronbach's α test were performed using SPSS 23, and confirmatory factor analysis and structural equation model analysis were performed with AMOS 18. The results are as follows: First, among the sub-factors of selection attributes, equipment, facility environment, and diving point showed a positive effect on emotional response, but staff service did not have any significant effect. Second, the emotional response positively affected by the selection attribute showed a positive effect on all factors of service excellence, consumer utility, fun value, and aesthetic value of empirical value. Therefore, scuba diving resort managers must recognize the importance of equipment, facility environment, and diving point among these selection attributes of customers. And to satisfy the customer needs the resort must accurately identify the needs for diving equipment, facility environment and diving point. Various methods for this should be explored through the needs of the identified customers, and efforts should be made to provide safe equipment, comfortable facilities, and various diving points.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제3권2호
• /
• pp.209-218
• /
• 2009

In a wireless sensor network(WSN) each sensor node deals with numerous sensing data elements. For the sake of energy efficiency and network lifetime, sensing data must be handled effectively. A technique used for this is data aggregation. Sending/receiving data involves numerous steps such as MAC layer control packet handshakes and route path setup, and these steps consume energy. Because these steps are involved in all data communication, the total cost increases are related to the counts of data sent/received. Therefore, many studies have proposed sending combined data, which is known as data aggregation. Very effective methods to aggregate sensing data have been suggested, but there is no means of deciding how long the sensor node should wait for aggregation. This is a very important issue, because the wait time affects the total communication cost and data reliability. There are two types of data aggregation; the data counting method and the time waiting method. However, each has weaknesses in terms of the delay. A hybrid method can be adopted to alleviate these problems. But, it cannot provide an optimal point of aggregation. In this paper, we suggest a stochastic-based data aggregation scheme, which provides the cost(in terms of communication and delay) optimal aggregation point. We present numerical analysis and results.

• 한국정보통신학회논문지
• /
• 제5권7호
• /
• pp.1301-1307
• /
• 2001

동영상 검색 시스템에서는 사용자가 전체 동영상 정보를 한눈에 파악하고, 필요한 경우 동영상의 원하는 지점부터 직접 재생할 수 있도록 하기 위하여 전체 동영상의 내용을 요약해 놓은 대표 프레임 리스트를 제공하며 대표 프레임 리스트를 작성하기 위하여 장면전환을 정확하게 검출할 필요성이 발생한다. 본 논문에서는 장면전환 지점을 추출하기 위하여 프레임을 일정한 블록으로 분할하고 다음 프레임의 동일 블록에서의 히스토그램 값을 비교하여 임계값을 넘지 못하면 다음 프레임을 컷으로 추출하였다.

• 한국인터넷방송통신학회논문지
• /
• 제21권6호
• /
• pp.99-104
• /
• 2021

스마트폰과 같은 단안 카메라를 이용하여 이동 궤적을 추정하고, 주변 3차원 영상을 구성하는 기술은 실내 위치 추정뿐만 아니라 메타버스 서비스에서도 핵심이다. 이 기술에서 가장 중요한 것은 이동하는 카메라 중심의 좌표를 추정하는 것인데, 본 논문에서는 기하학적으로 이동 거리를 추정하는 새로운 알고리즘을 제안하였다. 첫 번째와 두 번째 사진으로 3차원 물체점의 좌표를 구하고, 첫 번째와 세 번째 사진의 일치되는 특징점을 이용하여 이동 거리 벡터를 구한 후에, 세 번째 카메라의 원점 좌표를 이동하며 3차원 물체점과 세 번째 사진의 특징점이 일치되는 위치를 구한다. 실제 연속적인 영상 데이터에 적용하여 그 가능성과 정확성이 검증되었다.