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- 저자 : 朴芝炫(Jihyun Park) (검색결과 190 건)
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망막전위도검사에서 ERG-Jet 단극전극과 Burian-Allen 양극전극의 파형 비교
박지현,이호경,박성준,김윤화,Jihyun Park,MD,Hokyung Lee,MD,Sung Joon Park,MD,Yoon Hwa Kim 대한안과학회 2010 대한안과학회지 Vol.51 No.9
Purpose: To compare electroretinogram (ERG) waveforms acquired using an ERG-jet electrode and a Burian-Allen electrode. Methods: ERGs were recorded with an ERG-jet electrode and a Burian-Allen electrode from both eyes of 29 volunteers. Three consecutive recordings were obtained with both electrodes from the left eye of another 6 volunteers. Peak-to-trough amplitudes and peak implicit times were compared between both eyes, and between the 2 types of electrodes. Interpersonal and intrapersonal variation were also compared. Results: The differences in amplitude and implicit time between the right and left eyes were not influenced by the type of electrode. The amplitude of the ERG acquired using the Burian-Allen electrode, however, showed significant differences between both eyes, contrary to the amplitude acquired using the ERG-jet electrode. ERG recordings obtained using the ERG-jet electrode generally showed higher amplitude, shorter implicit time, and less interpersonal and intrapersonal variation than ERG recordings obtained using the Burian-Allen electrode. Conclusions: In this application, the ERG-jet ERG electrode appeared to be superior to the Burian-Allen electrode in terms of both usefulness and consistency. J Korean Ophthalmol Soc 2010;51(9):1217-1223
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국방 무기체계 소프트웨어 신뢰성 향상을 위한 소프트웨어 동적 결함 분석
박지현,최병주,Park, Jihyun,Choi, Byoungju 한국정보처리학회 2018 정보처리학회 논문지(KTSDE) Vol.7 No.7
국방 무기체계에서의 소프트웨어 비중이 증가하고 있으며 구조도 점차 복잡해지고 있어, 이에 따른 신뢰성 검증이 매우 중요하다. 특히 무기체계 시스템을 구성하는 소프트웨어 구성 요소 들의 상호 작용에 따라 발생하는 결함은 정적 시험 및 코드 실행률 점검 수준의 동적 시험만으로는 예방하기가 어렵다. 본 논문에서는 소프트웨어의 동적 결함 유형을 분류 개발한다. 미 국방부 무기체계에 사용하는 오픈 소스 소프트웨어(OSS)에서 보고된 이슈 분석을 통하여 본 논문에서 분류한 동적 결함이 실제로 발생하며, 이들은 대체로 통합 이후 발생하는 결함이며, 재현이 어렵고, 결함 원인 파악이 어려웠음을 보인다. 이 분석 결과를 기반으로 무기체계 신뢰성 검증을 위하여 소프트웨어 통합 시험 개선의 중요성을 도출한다. The importance of software in military weapon systems is increasing, and the software structure is becoming more complicated. We therefore must thoroughly verify its reliability. In particular, the defects from the interaction of the software components that make up the weapon system are difficult to prevent only with static testing and code coverage level dynamic testing. In this paper, we classify dynamic software defect types and analyze the issues reported in the Open Source Software (OSS) used in the US department of defense weapon systems. The dynamic defects classified in this paper usually occur after integration, and it is difficult to reproduce and identify the cause. Based on this analysis, we come to the point that the software integration test must be enhanced in order to verify the reliability of the weapon system.
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수중 주파수 선택적 채널에서 블록 인터리빙 기법을 적용한 길쌈부호화 기법의 성능
박지현,윤종락,Park, Jihyun,Yoon, Jong Rak 한국음향학회 2019 한국음향학회지 Vol.38 No.2
In this paper, we evaluate the communication performance of convolutional code with block interleaving in a frequency-selective channel. Block interleaving is a technique for spreading and rearranging digital data streams. A block interleaving technique is applied to improve the performance by dispersing the concentration of burst errors in a frequency-selective channel. As a result of evaluating the performance of the convolutional code with block interleaving in the water tank experiment, There was no difference in the performance of convolutional codes using block interleaving in a frequency-selective channel. However, in the frequency-selective channel, the convolutional code with block interleaving has a gain of 2dB, and it is confirmed that the underwater acoustic communication performance is improved.
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공압 gripper를 적용한 해양 건설 ROV 시스템 개발
박지현,황요섭,Park, Jihyun,Hwang, Yoseop 한국정보통신학회 2022 한국정보통신학회논문지 Vol.26 No.11
The safety of marine construction workers and marine pollution problems are occurring due to large-scale offshore construction. In particular, underwater construction work in the sea has a higher risk than other work, so it is necessary to apply an unmanned alternative system that considers the safety of the workers. In this paper, the ROV system for offshore construction has been developed for underwater unmanned work. A monitoring system was developed for position control through the control of underwater propellants, pneumatic gripper, and monitoring of underwater work. As a result of the performance evaluation, the underwater movement speed of the ROV was evaluated to be 0.89 m/s, and it was confirmed that the maximum load of the pneumatic gripper was 80 kg. In addition, the network bandwidth required for underwater ROV control and underwater video streaming was evaluated to be more than 300Mbps, wired communication at 92.7 ~ 95.0Mbit/s at 205m, and wireless communication at 78.3 ~ 84.8Mbit/s.
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시·공간 변동 수중음향 채널에서 CAZAC 코드를 적용한 반송파 주파수 옵셋 보상 기법의 성능평가
박지현,배민자,김종주,윤종락,Park, Jihyun,Bae, Minja,Kim, Jongju,Yoon, Jong Rak 한국정보통신학회 2016 한국정보통신학회논문지 Vol.20 No.7
In underwater acoustic multipath channel, a performance of underwater acoustic (UWA) communication systems is affected by dynamic variation of boundary and high temporal and spatial variability of the channel conditions. Time and spatial variations of UWA channel induce a carrier frequency offset (CFO) since a phase and a frequency of received signal mismatch with a transmitting signal. Therefore, a performance of a phase shift keying underwater acoustic communication system is degraded. In this study, we have analyzed a performance of CFO estimation and compensation using a phase code in time and spatial variation channel. A constant amplitude zero autocorrelation (CAZAC) signal is applied as a phase code signal and its performance is evaluated in water tank. The bit error rate of a quadrature phase shift keying (QPSK) system with a phase code is improved about 4 to 10 times better than that without a phase code.
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박지현(Park, Jihyun) 충청남도역사문화연구원 2021 충청학과 충청문화 Vol.31 No.1
『삼국사기』 신라본기에 남아있는 신라군의 출정 기사를 살펴보면, 신라군의 출정에는 그에 합당한 구체적인 목적이 먼저 제시되었다. 661년에는 대체로 유진당군의 구원과 지원, 군량 수송 및 지원군 파견을 위한 교통로 확보가 출정의 구체적인 목표였다. 그러나 662년 내사지성 전투에서는 백제잔적의 악행이라는 다소 모호한 배경이 언급되었다. 전후의 상황을 살펴보면 그 행간에는 웅진과의 통로를 확보하려는 목적이 담겨 있었던 것을 확인할 수 있다. 따라서 이때까지 신라군의 출정은 모두 당의 백제부흥군 진압을 지원하는 방향에서 이루어졌다고 볼 수 있다. 그러나 663년 2월 거열성을 비롯한 4성을 함락시킨 전투는 이와는 다른 배경을 가지고 있었던 것으로 생각된다. 당시 백제부흥군의 본거지는 피성으로 옮겨져 있었는데 신라는 이를 기회로 백제부흥군 본거지 공격을 명분삼아 낙동강 이서지역으로 군사를 출정시키고, 7세기 전반에 상실했던 옛 가야지역에 대한 영유권을 수복하려고 했던 것으로 여겨진다.
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An Analysis of Instagram Hashtags Related to the Exhibitions in Korea
Jihyun Park(박지현),Ayoung Seok(석아영),Youngjun Yoon(윤영준),Boa Rhee(이보아) 한국컴퓨터정보학회 2019 한국컴퓨터정보학회논문지 Vol.24 No.3
The purpose of this study is to analyze the characteristics and meanings of Instagram hashtags related to the exhibitions as a online communication platform of museums. At the same time, it focuses on efficiency of hashtags as a reference framework of inferring viewing experiences. We collect and visualize Instagram hashtags of exhibitions held in Korea for the past two years including ‘Paper Present (2017)’, ‘YOUTH (2017)’, ‘Monet, Draw Light Exhibition (2018)’, ‘Van Gogh Inside (2016)’, ‘Drawn by the Wind: Shin yun-bok & Jeong Seon’. To sum up, significant data related to viewing experiences are not derived, and hashtags as a reference framework of inferring viewing experiences are turned out to be inefficient. Meanwhile, we conclude that potential for distributing information about the exhibitions is inherent in hashtags. In terms of informational characteristics, we notice that the influence of hashtags related to regional information is presented more than the response toward the viewing experiences. This result shows that Instagram users in the exhibitions are worthy of place making rather than viewing experiences.
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KCI
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