• Annual Conference of KIPS
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• 2019.05a
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• pp.661-663
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• 2019

4차 산업 혁명의 핵심기술로 손꼽히는 AR을 이용하여 캠퍼스 이용에 유용한 정보를 제공한다. 사물인식, 위치기반의 AR구현 방식을 사용하며 AR네비게이션 방식으로 입체화된 길안내 정보를 제공한다. AR을 통해 제공되는 정보는 이미지 혹은 텍스트가 될 수 있고 3D모델, 미디어 그리고 이들의 모든 조합의 형태를 취할 수 있다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2016.10a
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• pp.133-134
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• 2016

전 세계적으로 많은 국가에서 가장 인기 있게 발행되는 복권은 로또복권이다. 각 나라마다 로또복권의 주당 발행회수나 추첨방식에 있어 조금씩 차이는 있지만 우리나라 역시 세계적인 흐름에 따라 2002년 12월에 처음으로 로또복권의 발매가 시작되어 지금까지 국민의 관심 속에서 지속적으로 성장해오고 있다. 그러나 로또복권 사업으로 발생한 수익을 소외계층에 대한 복지사업, 문화예술 진흥 등 사업에 환원되어 사용되어지고 있지만 진정한 의미보다 대박 인생역전 등의 사행적 이미지가 국민들에게 인식되고 있고 있는 것도 사실이다. 우리나라에서 발행되고 있는 로또복권은 주 1회 발행되며 한 번의 게임 당 1,000원이며 당첨은 1-45번까지의 숫자 중에서 순서에 상관없이 비복원 추출로 6개 당첨 숫자를 추첨하는 방식이다. 본 연구에서는 안드로이드 기반 6개의 조합 로또복권 번호를 자동으로 출력해 주는 애플리케이션을 추천하고자 한다.

• Proceedings of the Korea Water Resources Association Conference
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• 2022.05a
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• pp.296-296
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• 2022

농업적 가뭄은 토양의 수분함량(토양수분)이 마르기 시작하면서 식생 활동에 영향을 주는 것으로 정의할 수 있다. 광범위한 농업적 가뭄을 판별하기 위해 인공위성 자료를 토대로 토양수분을 산정하고 이를 이용해 가뭄지수를 산정하고, 가뭄 상태를 판별한다. 기존 인공위성 기반의 토양수분의 경우, microwave sensor에서 제공되는 밝기온도(brightness temperature)를 통해 토양수분을 추정하는 방식이 일반적으로 활용되었다. 하지만, microwave sensor에서 제공되는 자료들의 공간해상도가 10 km 이상이기 때문에, 한반도나 더 작게는 유역 단위, 행정 단위별 가뭄 분석을 하기에는 적합하지 않다. 이에 본 연구에서는 공간 해상도 500m의 광학센서(visible infrared imaging radiometer suite sensor (VIIRS))에서 제공되는 지표면 온도(land surface temperature)와 지표 반사도(land surface albedo) 자료들을 조합하여 토양수분을 산정하는 방식을 제안하고, 산출된 토양수분으로 농업적 가뭄을 모니터링한 결과를 제시하고자 한다. 기존의 microwave sensor로 산출된 토양수분 결과 값과의 비교 및 검증을 통해 광학센서를 통한 토양수분 산출물의 한반도 내 적용성을 확인할 수 있다.

• Annual Conference of KIPS
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• 2024.10a
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• pp.584-587
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• 2024

본 연구에서는 모빌리티 환경에서 비접촉 방식으로 도로 표면을 파악하여 운전자의 주행 안전성에 기여할 수 있는 음파 센서 기반의 노면 추정 기법을 제안한다. 본 연구에서 제안된 시스템은 Continuous-transmit (C-transmit) 방식으로 주행 중 노면의 임피던스 정보를 실시간으로 획득하고, 전처리된 음파 데이터를 AI 모델로 분석하여 노면의 미끄럼 정도에 따라 몇 가지 노면 패턴으로 분류한다. 제안된 기법의 검증 실험에서는 아스팔트, 시멘트, 흙 플레이트 노면을 구성하고, 6 종 기상조건 (dry, humid, wet, iced, snow, slush)을 재현하여, 총 18 가지 조합 조건에서 실험 데이터를 확보하였다. AI 모델 성능은 노면 미끄럼도에 따른 6 종 상태 분류에서 96.8 %의 분류 정확도를 보였다.

• Journal of Broadcast Engineering
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• v.9 no.1
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• pp.2-7
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• 2004

In this paper, we proposed the content-based music information retrieval technique using some MPEG-7 low-level descriptors. Especially, pitch information and timbral features can be applied in music genre classification, music retrieval, or QBH(Query By Humming) because these can be modeling the stochasticpattern or timbral information of music signal. In this work, we restricted the music domain as O.S.T of movie or soap opera to apply broadcasting system. That is, the user can retrievalthe information of the unknown music using only an audio clip with a few seconds extracted from video content when background music sound greeted user's ear. We proposed the audio feature set organized by MPEG-7 descriptors and distance function by vector distance or ratio computation. Thus, we observed that the feature set organized by pitch information is superior to timbral spectral feature set and IFCR(Intra-Feature Component Ratio) is better than ED(Euclidean Distance) as a vector distance function. To evaluate music recognition, k-NN is used as a classifier

• Journal of Hydrogen and New Energy
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• v.11 no.3
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• pp.137-147
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• 2000

Not only study of fuel cell performance but study of fuel cell application is very important, therefore these studies were paralleled together for the commercialization of exciting power generation. The objective of this study is to determine the characteristics of shaft power and efficiency as a function of rpm and to compare natural convection air method to forced air method. From these results, performance of forced air was better than that of natural convection air because it enables to improve mass transportation by increasing air flow rate. With decreasing shaft power, efficiency of fuel cell decreases remarkably because dc motor drives at the low range of efficiency. Fuel cell powered vehicle has to be driven considering efficiency and shaft power. It should be driven at 35-45% of efficiency and 0.55-0.75v/cell.

• Journal of the Institute of Electronics Engineers of Korea TC
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• v.48 no.9
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• pp.1-9
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• 2011

In this paper, we propose an efficient method to create clusters of geographically distributed base stations which cooperatively transmit signals in cellular mobile communication systems. The proposed method utilizes a sequential selection approach to choose candidate base stations which can provide maximum weighted sum-rate gain when they participate in the cooperative transmission with the existing cluster. In particular, the proposed method limits the maximum number of base stations in a cluster by considering the system operational and implementation complexities. Moreover, the combinations of clusters dynamically change along with variations of channel environments. Through computer simulations, performance of the proposed method is verified by comparing with the non-cooperative transmission method and the static clustering method. Numerical result shows that the proposed sequential selection based clustering method is especially advantageous for the performance improvement of lower percentile users in terms of average throughput, and thus the proposed method can effectively improve the fairness among users.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.22 no.1
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• pp.75-82
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• 2018

As user of mobile device increases, various user authentication methods are actively researched. The user authentication methods includes a method of using a user ID and a password, a method of using user biometric feature, a method of using location based, and a method of authenticating secondary authentication such as OTP(One Time Password) method is used. In this paper, we propose a user system which improves the problem of existing authentication method and encryption can proceed in a way that user desires. The proposed authentication system is composed of an authentication factor collection module that collects authentication factors using a mobile device, a security key generation module that generates a security key by combining the collected authentication factors, and a module that performs authentication using the generated security key module.

• Archives of design research
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• v.17 no.3
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• pp.441-448
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• 2004

Mobile devices such as mobile phones or PDAs are considered as main interlace tools in ubiquitous computing environment. For searching information in mobile device, it should be possible for user to input some text as well as to control cursor for navigation. So, we should find efficient interlace method for text input in limited dimension of mobile devices. This study intends to suggest a new approach to mobile interaction using camera based virtual keyboard for text input in mobile devices. We developed a camera based virtual keyboard prototype using a PC camera and a small size LCD display. User can move the prototype in the air to control the cursor over keyboard layout in screen and input text by pressing a button. The new interaction method in this study is evaluated as competitive compared to mobile phone keypad in left input efficiency. And the new method can be operated by one hand and make it possible to design smaller device by eliminating keyboard part. The new interaction method can be applied to text input method for mobile devices requiring especially small dimension. And this method can be modified to selection and navigation method for wireless internet contents on small screen devices.

• Journal of KIISE:Computer Systems and Theory
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• v.34 no.8
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• pp.327-336
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• 2007

Lots of effort toward design optimizations have been paid for a cost-effective system design in various ways from a transistor level to RTL designs. In this paper, we propose a bit level optimization of an adder design for expanding its design space. For the bit-level optimization, a heterogeneous adder organization utilizing a mixture of carry propagation schemes is proposed to design a delay-area efficient adder which were not available in an ordinary design space. Then, we develop an optimization method based on Integer Linear Programming to search the expanded design space of the heterogeneous adder. The novelty of the Proposed architecture and optimization method is introducing a bit level reconstruction/recombination of IPs which have same functionality but different speed and area characteristics for producing more find-grained delay-area optimization.