• 한국HCI학회:학술대회논문집
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• 2009.02a
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• pp.911-916
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• 2009

Cooper 는 퍼소나를 구체적으로 만들수록 유연성이 사라지기 때문에 디자인 도구로써의 퍼소나는 더욱 더 강력해진다고 하였다. 하지만 정밀한 퍼소나가 중요함에도 생성 초기에 특성과 관련하여 각각의 필요성과 우선순위에 대한 복잡함, 시간 투자 대비 정밀함의 정도를 예측불가 등에 대한 문제점을 제기할 수 있다. 따라서 본 연구는 5 명의 기존 연구자들이 언급한 퍼소나 특성을 기반으로 KJ 법을 활용해서 특성을 재분류 하였다. 그리고 각 분류별 세부항목을 Pruitt 와 Adlin 의 '퍼소나 특성의 종류와 빈도'와 Brown 의 '특성 정보 양에 따른 세 가지 층'에 기반한 정밀성, 중요성, 신속성을 기준으로 분류하였다. 최종적으로 퍼소나 실무 관련 전문가의 평가를 거쳐 퍼소나를 생성하는 단계에서의 효율적인 특성 구축을 위한 $6{\times}6{\times}3$ 프레임웍을 제안하였다.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.24 no.8
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• pp.1077-1085
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• 2020

In order to Mine Countermeasure (MCM), the search is carried out for the expected mine zone. At this time, mine hunting uses Autonomous Unmanned Vehicle(AUV), taking into account the danger of mine and the stability of our forces. Sonar system for identifying buried mines are equipped with Side Scan Sonar(SSS) or Synthetic Aperture Sonar(SAS). This paper describes the analysis of mine hunting effects according to the commercial SSS characteristics. Based on the characteristics of each SSS, the insonified area and recognition probability were modeled, and the analysis was performed according to the search pattern of the AUV. AUV's search pattern defines three patterns depending on the presence or absence of SSS or shaded areas. The analysis results derived search time and detection probability for each search pattern, and finally, the improvement of search depending on the presence or absence of side injection or shaded area.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.26 no.9B
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• pp.1336-1342
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• 2001

본 논문은 최적 상호상관 특성을 갖는 소나배열 쌍의 대수학적 생성방법을 제시한다. 이 생성방법은 최상의 소나배열 쌍은 주어진 행의 크기에 대해 가장 큰 열의 크기를 갖는다는 관점에서 최상의 소나배열 쌍을 찾기 위해 알려진 모든 모듈라 소나배열에 적용되어 진다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2002.05a
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• pp.159-162
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• 2002

This paper deals with target positioning performance according to active sonar formation and measurement error. Generally, active sonar can be categorized into Monostatic, Bistatic and Multistatic cases and their error characteristics are different each other. In this paper, on the assumption that each receiver has two kinds of measurements； sum of distances, and a angle between receiver and target, we suggest least square(LS) method that combines the two measurements in Multistatic formation, and compare Multistatic case with Monostatic and Bistatic cases. Experimental results show that target positioning RMSE in Multistatic sonar is superior to those in Monostatic and Bistatic sonar by approximately 57％.

• The Journal of the Acoustical Society of Korea
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• v.22 no.3
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• pp.224-232
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• 2003

In this paper, efficient deployment method of sensors and target positioning performance with respect to measurement error are dealt with. Active sonar can be categorized into Monostatic, Bistatic, Multistatic sonar, and characteristics of respective sonar are different. Assuming that each sensor can receive range and angular information, we compare the performance of Monostatic, Bistatic, and Multistatic systems. And we suggest Weighted least square (WLS) which gives the weight to former case, LS. In particular. adopting suggested method we investigate the target positioning performance according to number of sensor, distance from transmitter to receiver, and propose efficient arrangement rule for Multistatic sonar configurations. According to the experimental results, RMSE of Multistatic sonar is found to be superior to Monostatic and Bistatic by 35.98%. 37.45% respectively, and WLS is superior to LS approximately by 7.4% in average. Furthermore, as the difference of respective sensor's variance is large, it is observed that the improvement ratio of target positioning performance is increased.

• The Journal of the Acoustical Society of Korea
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• v.40 no.4
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• pp.382-390
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• 2021

Synthetic aperture sonars as well as side scan sonars or multibeam echo sounders have been commercialized and are widely used for seafloor imaging. In Korea related research such as the development of a towed synthetic aperture sonar system is underway. In order to obtain high-resolution synthetic aperture sonar images, it is necessary to accurately estimate the platform motion on which it is installed, and a precise underwater navigation system is required. In this paper we are going to provide reference data for determining the required navigation accuracy and precision of navigation sensors by quantitatively analyzing how much distortion of the sonar images occurs according to motion characteristics of the platform equipped with the synthetic aperture sonar. Five types of motions are considered and normalized root mean square error is defined for quantitative analysis. Simulation for error analysis with parameter variation of motion characteristics results in that yaw and sway motion causes the largest image distortion whereas the effect of pitch and heave motion is not significant.

• The Journal of the Acoustical Society of Korea
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• v.41 no.5
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• pp.481-491
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• 2022

The active sonar transmission system consists of a transmitter that outputs an electrical signal and an underwater acoustic transducer that converts the amplified electrical signal into an acoustic signal. In general, the transmitter output characteristics are dependent on load impedance, and an underwater acoustic transducer, which is a transmitter load, has a characteristic that the electrical impedance varies largely according to frequency when driven. In such a variable impedance condition, the output of the active sonar transmission system may become unstable. Hence, this paper proposes a design and control technique of a sonar transmitter for transmitting a stable transmission signal even under variable impedance conditions of an underwater acoustic transducer in an active sonar transmission system. The electrical impedance characteristics of the underwater acoustic transducer are experimentally analyzed, and the sonar transmitter is composed of a single-phase full-bridge inverter, an LC filter, and a matching circuit. In this paper, the design and output control method of the sonar transmitter is proposed to protect the transmitter and transducer. It can secure stable output voltage characteristics even if it transmits the Linear Frequency Modulation (LFM) signal. The validity is verified through the simulation and the experiment.

• Journal of the Korea Convergence Society
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• v.12 no.8
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• pp.123-129
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• 2021

MZ Generation has multipersona and characteristics that create various egos depending on the situation, and fashion styling is also expressed differently by each persona. Thus, this study investigates how to provide a multipersona or characteristic user experience to fashion shopping applications. Traditional fashion shopping apps, which focus on items, colors, and advertisements, have difficulty solving the problems of MZ generation fashion, so it is necessary to actively utilize their characteristics. We investigate the definitions and characteristics of multipersona and generation MZ, and identify the shopping behavior of generation MZ through prior research. We also analyze cases and improvements that indirectly utilize multipersona in fashion shopping apps. Four UX elements were derived through user interviews to identify needs and It was possible to derive positive effects, such as providing a shopping experience by forming one's own fashion characters in a personalized fashion beyond the existing fashion recommendation frame, which helps to worry about styling and gives a different experience.

• The Journal of the Acoustical Society of Korea
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• v.4 no.1
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• pp.22-34
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• 1985

소나 신호 처리에서, 흔히 발생하는 난반사에 의한 잡음 때문에, 기존에 사용되어지고 있는 앨고 리즘으로 처리하기에는 많은 문제점을 내포하고 있다. 본 연구는 소나 시스템의 신호 처리를 위하여 마 이크로 프로세서를 사용하였으며, 신호처리 방법은 코릴레이숀 접음과 반사음을 식별하고, 거기서 평가 된 것을 기준으로 직접음만의 신호를 재생하여 반사음을 처리하였다. 실험의 결과치와 계산치를 비교한 결과, 무향 수조의 특성에 의한 오차를 제외하고는 거의 오차가 없었으며, 그 오차는 주파수가 낮아짐에 따라 증가하였다. 실험 결과를 토대로 처리 시스템의 소형·단순화가 가능한 것으로 분석되었다.

• Korean Journal of Plant Resources
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• v.17 no.2
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• pp.189-201
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• 2004

The present study has measured eight pollen morphological parameters of Diploxylon species in Korea by light microscopy (LM). The results are as follows; 1. Diploxylon species in Korea showed significant (P＜0.01) interspecific difference in their pollen morphological parameters. 2. The discriminant analysis based on the pollen morphological parameters demonstrated that the classification ratio of Diploxylon was 49.9％. The maximum was at Pinus banksiana (72.8％) and the minimum was at P. sylvestris (62.2％). 3. The relationship among the Diploxylon species based on their pollen morphological parameters showed that P. densiflora and P. sylvestris were had the closest relationship while P. rigida and banksiana had the least relationship.