• Proceedings of the Korean Institute of Navigation and Port Research Conference
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• 2017.11a
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• pp.254-255
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• 2017

As the number of ships and goods shipped by marine transportation increases, almost all shipping companies adopted foreign crews in order to overcome lack of seafarers and be competitive for manning cost. Thus, these days it is inevitable to work with foreign crews aboard ships, but there occur many marine accidents due to language barriers and communication problems under multicultural and multilingual shipboard environments. In order to resolve troubles resulting from different languages, reduce miscommunication risks, and make working on ships safe and efficient, this study recognized the current status of ships with mixed crews, analyzed marine accidents caused by communication problems not only in Korea but also in other countries using analytical methodologies. Additionally, existing hazards affecting miscommunication were identified and risk of miscommunication was quantitatively evaluated while offering suggestions and future forecasts. Consequently, in this study we suggested that fundamental dialogues are to be necessarily educated on the ships with foreign crews so as to reduce the language barrier and risk of miscommunication. Furthermore, a standard maritime Korean language program and manual targeting Korean coastal vessels would be developed in the next step.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2012.05a
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• pp.65-66
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• 2012

For HF antenna, whip antenna with 6m length or more has been used generally. In this paper, we suggest a new HF antenna which is smaller than commercial HF whip antenna. The shape of the proposed antenna is "ㄷ" and the size of the antenna is $1m{\times}2m$. The feature of the antenna has been simulated by NECWin tools.

• Proceedings of KOSOMES biannual meeting
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• 2018.06a
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• pp.17-17
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• 2018

• Journal of electromagnetic engineering and science
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• v.5 no.4
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• pp.161-165
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• 2005

We prepared Mn-Zn ferrite Electromagnetic(EM) wave absorbers. The Mn-Zn ferrite EM wave absorbers were coated with Sr ferrite powders and $Al(OH)_3$ powders. The coated Mn-Zn ferrite EM wave absorbers show improved absorption compared with non-coated Mn-Zn EM wave absorbers.

• ETRI Journal
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• v.28 no.5
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• pp.680-683
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• 2006

One objective in developing the next generation of wireless communication systems is to increase data rates and reliability. A promising way to achieve this is to combine multiple-input and multiple-output signal processing with a space-time coding scheme, which offers higher coding and diversity gains and improves the spectrum efficiency and reliability of a wireless communication system. It is noted, however, that time delay differences and phase differences among different channels increase symbol interference and degrade system performance. In this letter, we investigate phase differences and their effects on multiple-input and multiple-output systems, and propose a compensation algorithm for the Rayleigh fading model to minimize their effects.

• Journal of Navigation and Port Research
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• v.29 no.2
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• pp.147-150
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• 2005

We suggest a cast Alnico magnet as a new microwave absorber. The proposed Alnico microwave absorber shows advanced microwave absorption properties of 24 dB at 13.3 GHz for the thicknesses of 1 mm We also investigated the effects of the carbon, which qjfects strongly to microwave absorption in Alnico magnet microwave absorbers. Central frequency shifts toward lower frequency with increasing Alnico content which is related to the frequency to show tan 8 > 1. Also, we investigated the sample thickness dependence on the microwave absorption properties.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.12a
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• pp.283-286
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• 2002

자동화 지문인식을 위한 과정에서 지문영상의 정보를 보존하면서 최적의 세선화와 특이점추출을 위한 중요한 부분은 이진화 과정이다. 이진화 과정은 그레이-스케일 레벨의 영상을 0과 255값으로 바꾸는 과정이다. 이 과정에서 적절한 임계값(Threshold Value)을 설정해 주지 않으면 지문영상의 정보가 손실된다 본 논문에서는 이진화 과정 부분에 인공지능 기법을 적용하여 입력되는 지문영상에서 실시간으로 기준레벨(Threshold)을 추출하는 방법을 제안한다. 실험결과 기존의 방법과 비교하여 좋은 성능을 보여주고 있음을 나타낸다

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2015.07a
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• pp.167-168
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• 2015

최근 IT융합 기술이 더욱 발전하고 있고 사물 인터넷의 활용으로 생활의 편리 및 안전과 관련된 다양한 응용 기술들이 개발되고 있다. 이에 본 논문에서는 IT융합 기술을 활용해 재난상황 발생 시 초기 대응이 가능한 시스템을 개발하였다. 개발된 시스템은 각종 센서를 이용하여 재난 상황을 감지하고 재난 발생 시 즉시 중앙 서버로 재난발생을 알린다. 중앙 서버에서는 건물내부에 있는 인원들에게 스마트폰을 통해 신속히 그 상황을 알리고 평소에 조명등으로 사용되는 LED를 능동적인 비상구유도등으로 활용함으로써 재난상황에 대해 신속히 대응하여 인명사고를 줄일 수 있을 것이다.

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.171-171
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• 2017

• Proceedings of KOSOMES biannual meeting
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• 2017.11a
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• pp.151-151
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• 2017