A telesounder is a device that can monitor the appearance of fish in the sea on land and store fish detection data. This study was conducted to monitor the appearance of fish resources in coastal or near seas by using LTE communication for data transmission of the telesounder. The purpose of this study was to develop a prototype telesounder that can monitor the appearance of fish groups in the waters about 50 km away from the coast and store fish detection data. In this study, the prototype telesounder including a fish finder, communication device and battery for stable operation at sea was developed. The stability of telesounder buoy, data transmission/reception and expected use time were investigated. The expected use time of the telesounder using LTE communication with a lithium battery (12 V, 120 Ah) was about 274 hours under the conditions of 10 minutes off and 10 minutes on, about 520 hours under the conditions of 30 minutes off and 10 minutes on, and about 142 hours under continuous conditions. As a result of the sea test, it was found that the telesounder can be used in the sea area moved about 34 km from the land and the telesounder buoy was evaluated to have secured basic stability (buoyancy balance, waterproof, antenna strength, etc.) for operation in a marine environment.

In this study, through an AHP (Analytic Hierarchy Process) analysis, the internal construction project was designed to analyze the factors affecting the performance of the project and provide suggestions on the quality of communication. To carry out this study, a selection factor was selected by referring to AHP theory and existing prior research. AHP technique was used to collect weights after analysis, examine and analyze gaps. In the interior construction project, the most important factor among the factors influencing the quality of communication to the project performance was communication interaction. Among the sub-factors, accuracy of exchange of information and timeliness of communication were shown in the order of importance. Looking at the results of comprehensive analysis of the first and second layers, the accuracy of information exchange among the elements of communication quality was found to be the number 1 in weight. The timeliness of communication, which is ranked second, and communication that takes place at an appropriate time can lead to efficiency in shortening the project execution period by eliminating unnecessary work. And, Among the factors that affect communication quality, it was analyzed that communication method is not an important factor when compared to other factors. This study shows that quality of communication influences the performance of interior construction projects and provides suggestions for improving communication quality. And it has been confirmed that managing communication quality can act as an important issue that can improve business performance in project execution and production of results.

The purpose of this study was to identify the relationship between complexity, tacit knowledge, know-how, perception, and perception on business performance, and to suggest management implications for corporate performance and organizational executives. Therefore, the implications of this study are as follows. First, corporate representatives and staff in charge of organization should be able to access various information and contents through various routes about the work of members of the organization, and should make efforts to freely communicate among members. Second, corporate representatives and organizational practitioners should consider using the traditional methods of communication within their work, but allowing more informed and inmates to do more off-the-job activities that can increase intimacy with each other. Third, corporate representatives and organizational practitioners should provide a situation in which they can acquire work knowledge in a variety of ways, but must devise communication methods to increase information sharing and information value among members. Fourth, corporate representatives and organizational practitioners should endeavor to provide employees with educational support, family invitation events, awards and bonuses, and compliments that will make them more interested in their work. Lastly, corporate representatives and organizational practitioners are encouraged to maintain effective communication, employee pride, etc., so that the concentration of work, achievement, quality and productivity of work, and high professionalism can be maintained. You will have to work hard.

Purpose: This study aimed to examine the effects of simulation-based learning on the critical thinking disposition, communication confidence, and performance confidence in nursing care for children with fever. Method: A one-group pre- and post-test design was used. A total of 59 nursing students participated. Results: The results of this study showed that the effectiveness of simulation-based learning showed statistically significant improvement in critical thinking disposition, communication confidence and performance confidence. Conclusion: The findings indicate that simulation-based learning in the nursing care of children with fever may be an effective teaching-learning method for nursing students.

A conceptual paper is developed in regards to the influences of institutional research, word-of-mouth (via internal students and faculties), quality signaling (to external prospect students and stakeholders as potential customers), and customer relationship management, on student recruitment performance as a special form of customer decision. Grounded on the marketing communication perspective, we propose that the student recruitment performance is largely affected by word-of-mouth, quality signaling, and customer relationship management as strategic marketing communications, which are facilitated by institutional research. Institutional research is interpreted as a strategic marketing tool that can help identify, communicate, and visualize the strengths of a university. The conceptual model contributes to the search for marketing mechanisms through which institutional research can generate impact to external stakeholders. Formal propositions and their implications for future, larger-scaled surveys were discussed. From a non-profit organization’s marketing perspective, higher education institutions (HEIs) promote itself by actively communicating the strengths, features, unique positions, and so forth, to its internal and external “customers,” including existing and prospect students and parents, the surrounding community, and governmental units (Kotler, 1982; Licata & Frankwick, 1996). For example, the decision making of that a prospect student in determining if s/he is attending a college can be treated as a cognitive psychological process involving the interaction between a college’s quality signaling and a customer’s evaluation of that signaled quality. Put differently, the “customer decisions” of whether accepting services sold from an university can depend on the result of university-stakeholders communications. With the extant progress in educational theory and practices by adopting a marketing perspective, there are significant unresolved issues in research and practices that warrant more systematic investigation. Knowing the importance of marketing communication, for example, what is the foundation for universities to communicate with internal and external stakeholders? Through what mechanisms and occasions can universities communicate with and signal to stakeholders? To respond to such gaps in the literature, WE propose that institutional research of a university (Knight et al., 1997; Jedamus & Peterson, 1980) plays a role of strategic communication in facilitating internal and external stakeholder communication, engagement, and cognition building. Overall, the propositions include the following. Proposition 1. Institutional research outcomes (i.e., created knowledge) generates significant impacts on students recruitment performance Proposition 2. The impacts of institutional research on student recruitment performance is mediated by strategic marketing mechanisms, including quality signaling, word-of-mouth, and customer relationship management Proposition 3. Quality signaling, word-of-mouth, and customer relationship management intervene interactively on the effects of institutional research on student recruitment

To clarify the nature of the effect of collaborative communication on marketing performance, this study draws on the opportunism theory in order to develop a conceptual framework for investigating how a marketer’s opportunism moderates the relationship between collaborative communication and marketing performance. Empirical findings indicate that a marketer’s opportunism negatively moderates the relationship between collaborative communication and customer cooperation performance, whereas it positively moderates the relationship between collaborative communication and financial performance.

The Purpose of this study is to empirically examine the impact of various internal and external innovation activities of SMEs on their innovation performances in the field of electronics and communication industry. Drawing upon the literature review, internal and external innovation activities are defined and conceptualized, and independent, dependent and moderator variables are developed. We have used survey-based data for this study from the survey of technology innovation activities in manufacturing industry, which was conducted by the Science and Technology Policy Institute (STEPI) in 2010. The main result of this study shows that there were no significant differences in the impact of innovation activities on market performance according to the size of SMEs. On the other hands, we found that there were significant differences in the impact of innovation activities on technological innovation performance according to the size of SMEs. Therefore, in order to make high technological innovation performance, companies in the field of electronics and communication industry need to properly implement the internal and external innovation activities by considering their size.

  We analyze a voice/data integrated traffic model of the cellular mobile communication system with hybrid guard channels for voice and handoff calls. In a multi-service integrated wireless environment, quality of service guarantee is crucial for smooth t

With the continuous development of social economy, performance communication plays a more and more important role in enterprises. Performance communication plays different roles in different stages of performance management. Based on relevant theories of management, this paper further explores the importance of communication performance, including communication between leaders and employees, communication between departments, communication between teams, communication between employees, and so on. Through the case analysis of Qinhuangdao Branch of China Life Insurance Company, this paper further demonstrates the importance of performance communication, as well as the existing problems, and provides valuable experience for the development of enterprises

A CubeSat platform has become a popular choice due to inexpensive commercial off-the-shelf (COTS) components and low launch cost. However, it requires more power-efficient and higher-data rate downlink capability for space applications related to remote sensing. In addition, the platform is limited by the size, weight and power (SWaP) constraints as well as the regulatory issue of licensing the radio frequency (RF) spectrum. The requirements and limitations have put optical communications on promising alternatives to RF communications for a CubeSat platform, owing to the power efficiency and high data rate as well as the license free spectrum. In this study, we analyzed the performance of optical downlink communications compatible with CubeSat platforms in terms of data rate, bit error rate (BER) and outage probability. Mathematical models of BER and outage probability were derived based on not only the log-normal model of atmospheric turbulence but also a transmitter with a finite extinction ratio. Given the fixed slot width, the optimal guard time and modulation orders were chosen to achieve the target data rate. And the two performance metrics, BER and outage data rate, were analyzed and discussed with respect to beam divergence angle, scintillation index and zenith angle.

Satellite optical communication has gained significant attention owing to its many quality features (e.g., a larger bandwidth, license free spectrum, higher data rate, and better security) compared to satellite microwave communication. Various experiments have been performed during many space missions to demonstrate and characterize inter-satellite links, downlinks, and uplinks. Korea has also planned to establish an experimental communication system using a geostationary earth orbit (GEO) satellite and the Geochang station as an optical ground station for low Earth orbit (LEO)-to-ground optical relay links. In this study, the performance of inter-satellite communication links and downlinks was investigated for the new Korean experimental communication system in terms of link margin, bit error rate (BER), and channel capacity. In particular, the performance of the inter-satellite links was analyzed based on the receiving apertures and the transmitting power, while that of the downlink was analyzed in terms of atmospheric turbulence conditions and transmitting power. Finally, we discussed two system parameters of receiving aperture and transmitting power to meet the three criteria of link margin, BER, and channel capacity.

Scientific CubeSat with Instruments for Global Magnetic Fields and Radiations (SIGMA) is a 3-U size CubeSat that will be operated in low earth orbit (LEO). The SIGMA communication system uses a very high frequency (VHF) band for uplink and an ultra high frequency (UHF) band for downlink. Both frequencies belong to an amateur band. The ground station that communicates with SIGMA is located at Kyung Hee Astronomical Observatory (KHAO). For reliable communication, we carried out a laboratory (LAB) test and far-field tests between the CubeSat and a ground station. In the field test, we considered test parameters such as attenuation, antenna deployment, CubeSat body attitude, and Doppler frequency shift in transmitting commands and receiving data. In this paper, we present a communication performance test of SIGMA, a link budget analysis, and a field test process. We also compare the link budget with the field test results of transmitting commands and receiving data.

본 연구는 해상풍력발전기에 추가적인 통신전용선로를 확보하지 않고도 자체 전력선을 이용하여 나셀의 상태를 감시할 수 있는 시스템을 구현하는 것을 목표로 한다. MW 급 해상풍력발전기의 내부 전력선을 훼손하지 않고도 통신선로를 확보하기 위하여 유도성 결합기 기반 비접촉식 무배선 통신시스템을 제안하고 성능시험 결과를 보고한다. 페라이트 복합물질을 이용하여 최대 500 A의 고 전류에도 동작할 수 있는 전력선 통신용 유도성 결합기를 개발하였으며 제주도 풍력단지에서 실증시험을 진행하였다. iperf를 이용한 통신성능시험에서 풍력발 전기 나셀부와 하단 기저부의 전력변환기간 100 m 길이의 전력선으로 최소 15 Mbps 이상의 통신 속도를 안정적으로 확보할 수 있음을 보였 다. 이를 바탕으로 1 주일간의 연속적인 통신상태 시험을 수행하였으며 평균 20 Mbps의 데이터 전송률을 확인하였다. 시험기간 동안 단한번 의 통신 불량도 발생하지 않았다. 다음으로 나셀 내부 온도 분포와 변화를 측정하기 위하여 적외선 카메라를 설치하였다. 카메라에서 획득한 실시간 열화상 이미지가 오류 없이 성공적으로 전송됨을 확인하였다.

수중 음향 통신은 과거 군사적 목적을 위해 제한적으로 사용되어졌으나, 수중 탐지, 운동체 추적, 잠수함, 부이를 이용한 해양의 날씨 변화 등 해양에서의 통신에 대한 연구가 활발히 이루어지며 활용 분야가 확대되고 있는 추세이다. 수중음향통신은 다중경로로 인한 신 호간의 간섭으로 성능 및 전송율이 열약한 실정이다. 따라서 다중 경로 전달 환경인 수중음향통신에서 원활한 통신과 함께 수신 신호의 성능 을 향상시키기 위하여 낮은 SNR에서도 우수한 성능을 보이는 채널 부호화 기법에 대해 연구하였다. 본 논문에서는 데이터 길이의 가변성이 좋은 BCJR기반 (2,1,7) 컨볼루션 부호를 적용하였으며, 다중 경로 전달로 인해 왜곡된 데이터를 보상하기 위해 결정 궤환 등화기가 결합된 터 보 등화기 구조를 적용하였다. 문경시 경천호에서의 실제 수중 실험을 통하여 BCJR 기반의 터보 등화 구조가 다른 비터비 복호방식의 경판 정, 연판정 기법에 비해 성능이 우수함을 검증하였다. 이러한 BCJR 복호의 성능은 반복횟수는 평균 1회에서 3회 정도에 오류가 정정되고, 복 호기 입력단의 오류율이  이하이면 모두 복호가 가능함을 볼 수 있으며, 16번의 수중통신 실험은 약 83%의 성공률을 획득하였다.

수중음향 채널은 일반적으로 다중경로 전달과 분산 등으로 인해 통신하기에 어려운 매질 가운데 하나로 인식된다. MIMO (Multiple-input multiple-output) 기술은 대역이 제한된 수중음향 채널에서 데이터 전송율을 증가시키기 위해 최근 활발히 연구되고 있다. 이 경우 전송 다이버시티 기술을 적용할 수 있는데 대표적인 것이 Alamouti 구조이다. 이 논문에서는 실험을 통하여 전송 다이버시티 기술의 성능을 고찰하였다. 실험에는 2개의 송신기와 2개의 수신기가 사용되었으며, 실내의 음향수조에서 수행되었다. 실험 결과 5~8%의 오차율을 확인하였는데 이는 같은 전송율을 기준으로 SISO(Single-input single-output) 채널에서의 오차율 14.8% 보다 향상된 결과를 나타내었다.

이 논문에서는 저전력 통신 기법 가운데 하나인 PSPM(Phase Shift Pulse position Modulation) 전송 기법이 근거리 수중음향 채널에서 어떠한 성능을 나타낼지 고찰하기 위해 해상실험을 통해 분석하였다. PSPM은 QPSK(Quadrature Phase Shift Keying)와 PPM(Pulse Position Modulation) 기법을 서로 혼합한 형태로 WBAN(Wireless Body Area Network) 시스템에서 저전력 통신을 위해 제안된 기법이다. 이는 기존의 일반적인 전송 방식에 비해 대역효율은 떨어지지만 전력효율은 증가하는 것으로 알려져 있다. 이 논문에서는 실해역에서 취득한 PSPM 데이터를 통해 BER 성능을 분석한다. 실험 결과 QPSK의 경우 총 56,000개의 전송 데이터 비트 중 오차 비트 수가 3,384개로 BER이 약 6.04×10-2이고, PSPM의 경우는 19,652개로 BER이 약 3.5×10-1를 얻었다. 또한 영상 데이터 전송에 따른 PSNR(Peak signal-to-noise ratio)을 비교한 결과 QPSK의 경우 9.37 dB 였으며, PSPM의 경우 9.11 dB 였다.

수중 통신 시스템의 성능은 수중채널의 특성에 영향을 받으며, 잔향 및 다중경로(Multi-path)로 인한 지연확산은 데이터 전송 시인접 심벌간의 간섭(Inter Symbol Interference : ISI)의 원인이 되며, 이는 통신 성능 저하의 주 원인이 된다. 본 논문에서는 잔향 및 다중경로로 인한 인접 심벌간의 간섭을 극복하기위해 OFDM(Orthogonal Frequency Division Multiplexing) 변조기법을 이용한 수중에서의 음향통신 실험을 통해 그 성능을 분석하였다. 그 결과 전송속도가 2 kbps인 경우 BER(Bit Error Rate)이 1.22×10-1이였으며, 전송속도가 4 kbps인 경우 BER은 2.47×10-2이었다.