• Journal of Korea Society of Digital Industry and Information Management
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• v.11 no.4
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• pp.143-154
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• 2015

This study aims to evaluate smartphone gaming controllers. Diffusion of smartphone makes its users to play smartphone games in ease and comfort and its built-in sensors deliver new gaming experience to the users. Based on the concept how the controller system is important, the current research also implies the importance of customizing service which gives users a selection to deploy a controller. To explore the interaction effect of controllers and customizing on interactivity, flow, usability, attitude, and intention, the research constructs 3(gyroscope, wheel, and button controllers) by 2(default and customizing setting) experimental design and forty college students played Gameloft's Asphalt 8: Airborne in a within subject design. The results showed that interaction effect and customizing main effect were not found, but controller main effect was statistically significant. Button controller is superior to those other two in more detail. It implies that it is still not useful to play new types of gaming controller, and a customizing service. It suggests that smartphone games should more focus on improving optimal user experience with built-in sensor controllers.

• Transactions of the Korean Society for Noise and Vibration Engineering
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• v.14 no.9 s.90
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• pp.819-826
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• 2004

A multi-step optimum strategy for the selection of the locations and directions of strain gauges is proposed in this paper to capture at best the modal response of blade in a series of modes on fan blades. It is consist of three steps including two pass reduction step, genetic algorithm and fine optimization to find the locations-directions of strain gauges. The optimization is based upon the maximum signal-to-noise ratio(SNR) of measured strain values with respect to the inherent system measurement noise, the mispositioning of the gauge in location and gauge failure. Optimal gauge positions for a fan blade is analyzed to prove the effectiveness of the multi-step optimum methodology and to investigate the effects of the considering parameters such as the mispositioning level, the probability of gauge failure, and the number of gauges on the optimal strain gauge position.

• Journal of the Korea Institute of Military Science and Technology
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• v.14 no.3
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• pp.474-481
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• 2011

The Electronic Warfare Computer for the Aircraft Survivability Equipment will improve the ability for countermeasures by analysis about threat information. This paper suggests method that threat data integration of multiple sensors(Radar Warning Receiver, Laser Warning Receiver, Missile Warning Receiver). The algorithm of threat data integration is based on detected threat sequence and azimuth information. The threat sequence information is analyzed in advance and the azimuth data is received from sensors. The suggested method is evaluated through simulation under the environment like real helicopter.

• Journal of the Optical Society of Korea
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• v.19 no.2
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• pp.182-187
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• 2015

This paper presents a new graphical method for selecting a pair of optical glasses to simultaneously achromatize and athermalize an imaging lens made of materials in contact. An athermal glass map that plots thermal glass constant versus inverse Abbe number is derived through analysis of optical glasses and plastic materials in visible light. By introducing the equivalent Abbe number and equivalent thermal glass constant, although it is a multi-lens system, we have a simple way to visually identify possible optical materials. Applying this method to design a phone camera lens equipped with quarter inch image sensor having 8-mega pixels, the thermal defocuses over $-20^{\circ}C$ to $+60^{\circ}C$ are reduced to be much less than the depth of focus of the system.

• KSCI Review
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• v.15 no.1
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• pp.31-35
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• 2007

많은 센서 네트워크 응용 분야에서 센서 노드들은 무인 환경에서 배치되므로, 물리적인 공격들과 노드가 가진 암호 키들이 손상되기 쉬운 취약성을 가진다. 위조 보고서는 훼손된 노드를 통해서 잠입할 수 있고 이 위조보고서는 거짓 경보를 유발할 수 있을 뿐만 아니라, 네트워크의 제한된 에너지의 고갈을 야기한다. 이러한 문제점을 보안하기 위해 Ye 등은 통계적 여과 기법을 통해서 위조 보고서를 탐지하고 도중에 여과시키는 방안을 제시한다. 이 제안된 방안에서 각 노드는 검증을 위한 일정한 양의 정보를 가지며. 탐지 능력은 라우팅 경로의 선택에 의해 영향을 받는다. 본 논문에서는, 통계적 여과 기법의 위조 보고서 탐지 능력을 향상시키기 위한 경로선택 방법을 제안한다. 각 노드는 베이스 스테이션으로부터 정해지는 각 경로들의 위조 보고서 탐지 능력을 평가하고 위조 보고서 침투 공격에 대해 가장 안전한 경로를 선택한다.

• Smart Structures and Systems
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• v.4 no.6
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• pp.711-726
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• 2008

A number of efforts had been sought to instrument bridges for the purpose of structural monitoring and assessment. The outcome of these efforts, as gauged by advances in the understanding of the definition of structural damage and their role in sensor selection as well as in the design of cost and data-effective monitoring systems, has itself been difficult to assess. The authors' experience with the design, calibration, and operation of a monitoring system for the Kishwaukee Bridge in Illinois has provided several lessons that bear upon these concerns. The systems have performed well in providing a continuous, low-cost monitoring platform for bridge engineers with immediate relevant information.

• Proceedings of the Korean Information Science Society Conference
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• 2005.07a
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• pp.433-435
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• 2005

현재 무선 센서 네트워크에서 에너지 효율적인 라우팅을 위해 않은 알고리즘들이 발표 되고 있다. 그 중 클러스터링을 기반으로 하는 라우팅 알고리즘들은 싱크노드가 클러스터 내의 클러스터 헤드와 통신함으로써 센서노드들과 싱크노드 사이의 통신 횟수를 줄여 에너지 효율을 얻을 수 있다. 클러스터링 기반의 라우팅 알고리즘에서는 클러스터 내의 클러스터 헤드 선정이 무엇보다 중요하다. 그래서 본 논문에서는 효율적인 클러스터 헤드 선정 방안을 제안한다. 제안된 방안은 클러스터 내에서 노드의 잔존 에너지와 트래픽 로드를 가지고 클러스터 헤드를 효율적으로 결정함으로써 센서 네트워크의 생존시간을 최대화 한다.

• Proceedings of the KIEE Conference
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• 2004.11a
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• pp.223-226
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• 2004

Many extensive researches in the area of sensor's technology for corrosion monitoring in concrete structures have increasingly been carried out in recent years. This paper gives a brief discussion on the principles and usage of the role of sensors involved in both corrosion initiation and propagation steps of reinforcement corrosion monitoring in concrete structures. Special attention was given to the review of various sensing devices, selection of reliable sensing devices for detecting reinforcement corrosion at the particular environment and at the efficiency of the devices used. Various sensing operations in new and existing concrete structures are also described.

• Proceedings of the KAIS Fall Conference
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• 2010.05a
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• pp.45-48
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• 2010

에너지 효율성이 중요한 무선 센서 네트워크에서 클러스터링 기술은 클러스터 헤드 노드가 클러스터 멤버 노드의 데이터를 병합하여 싱크노드로 전송함으로써 센서노드들과 싱크노드 사이의 통신 횟수를 줄여 에너지 효율을 얻는다. 이와 관련된 연구로 LEACH(Low Energy Adaptive Clustering Hierarchy) 프로토콜은 센서 네트워크의 데이터 처리 및 전송 부하를 센서 노드 전체에 분산 시켜 무선 센서 네트워크의 수명을 연장 하였다. 본 논문에서는 분산형 클러스터링 라우팅 기법 중 가장 대표적인 LEACH의 클러스터 헤드 결정 방법에 대한 고찰과 이를 토대로 새로운 확률적 클러스터 헤드 결정 방법의 도출을 이루어 내고자 한다.

• Proceedings of the KSRS Conference
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• 2003.11a
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• pp.1307-1309
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• 2003

The EO-1 spacecraft, launched November 21, 2000 into a sun synchronous orbit behind Landsat 7, hosts advanced technology demonstration instruments, whose capabilities are currently being assessed by the user community for future missions. A significant part of the EO-1 program is to perform data comparisons between Hyperion, ALI and Landsat 7 ETM+. In this paper, a comparison of forest classification results from Hyperion, ALI, and the ETM+ of Landsat-7 are provided for Wangqing Forest Bureau, Jilin Province, Northeast China. The data have been radiometrically corrected and geometrically resampled. Feature selection and statistical transforms are used to reduce the Hyperion feature space from 86 channels to 14 features. Classes chosen for discrimination included Larch, Spruce, Oak, Birch, Popular and Mixed forest and other landuses. Classification accuracies have been obtained for each sensor. Comparison of the classification results shows : Hyperion classification results were the best, ALI's were much better than ETM+.