• 한국ITS학회 논문지
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• 제3권1호
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• pp.21-30
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• 2004

본 논문에서는 자동요금 징수 시스템(ETCS : Electronic Toll Collection System)의 RSE와 OBU 간의 RF link설계와 도로의 폭과 진행 방향 길이에서 적절한 통신 영역을 얻기 위해 요구되는 안테나의 빔 패턴 특성을 분석하였다. 이 과정은 능동형 DSRC를 기반으로 하는 ITS 서비스의 시스템 요구 규격을 결정하기 앞서 수행되어져야 하며, ETCS 기지국 설계 및 구축에서 가장 기본적이고 중요한 기술적 분석을 위하여 고찰하였다.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.319-323
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• 2005

As the software industry develops at a rate speed, anyone can copy or plagiarize without difficulty contents that are becoming digitalized. To make it worse, the development of various contents that be illegally copied and plagiarized are resulting in the increasing infringement on and the plagiarism of the intellectual property. This dissertation tries to put forth the method and the theory to effectively detect any plagiarism of the source code of programs realized in various languages. This dissertation analyzes the advantage and disadvantage of the plagiarism test software, and especially, presents a method to detect possible plagiarism by using the Pattern Matching to overcome its disadvantage. And it also intends to introduce more developed automatic detection system by overcoming the problems with the method of Pattern Matching.

• 센서학회지
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• 제26권3호
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• pp.173-178
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• 2017

In this paper, we newly developed an omnidirectional receiver for visible light communication (VLC). The omnidirectional receiver was composed of a flexible solar cell attached on a cylindrical surface with its axis in vertical direction. The solar cell surface was symmetrical and showed an almost uniform receiving pattern in a horizontal plane. The maximum difference in a receiving pattern was within 7% of its peak value in a horizontal plane. This configuration is very easy to fabricate and useful in constructing wireless sensor networks in which one receiver needs to detect multiple LED signals in different directions.

• 한국치위생학회지
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• 제17권5호
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• pp.943-955
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• 2017

Objectives: This study aims to suggest the future direction to improve dental hygienists' competencies to communicate with patients to increase the compliance and dental service satisfaction, based on the analysis of survey data given to patients on dental hygienists' communication patterns with patients. The findings of this research is aimed to serve as the basic data for future researches on related area. Methods: A survey was conducted to ordinary people with experiences of receiving dental treatment in Gwangju and Jeonnam from July 29th 2017 to September 10th 2017. 224 copies of the questionnaire were used for final analysis. Results: The scores of each communication pattern (informative, friendly, and authoritative patterns) of dental hygienists perceived by research subjects were as follows: $3.76{\pm}0.76$, $3.47{\pm}0.62$, and $2.64{\pm}0.70$ respectively. In the effects of communication patterns on the compliance of patients, it was found that the informative communication pattern (${\beta}=0.227$, p=0.008) and friendly communication pattern (${\beta}=0.216$, p=0.012) had positive (+) effects. Conclusions: Thus, the results of this study verified that dental hygienists' communication patterns are important elements affecting patients' compliance and their satisfaction. For the smooth patient-centered bilateral communications, it will be necessary to continuously develop educational programs related to dental hygienists' communication, and also to have continuous researches targeting patient groups for the comparison to meet dental service satisfaction.

• 반도체디스플레이기술학회지
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• 제10권4호
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• pp.65-70
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• 2011

These days, printed electronics attract attention from electronics industry. In this paper, the fabrication of the fine patterns by Near Field Electro Spinning (NFES) was studied by using Ag ink on silicon wafer (substrate). Two types of ink, the high viscous ink Ag-200 and low viscous ink Ag-15, were used. The fine and uniform patterns were easily fabricated by using Ag-200 because jet breakup is less occurred in high viscosity solution. As increasing flow rate of solution, aspect ratio of Ag pattern decreased. And there was optimum applied voltage for fine pattern. In case of Ag-200, the optimum applied voltage was about 2.02KV. When pattern was fabricated by NFES, the pattern width and height were affected by many factors such as viscosity, flow rate of solution, applied voltage etc.

• 한국산학기술학회논문지
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• 제16권1호
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• pp.666-670
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• 2015

본 논문은 생체신호를 측정하는 팔목부착용 Fitbit Flex상에 구현된 방사패턴 재구성 안테나에 관련된 논문이다. 또한 본 논문에서 제안하는 루프-다이폴 방사패턴 재구성 안테나의 인체 내 부위별 전자파 흡수율 (Specific Absorption Rate; SAR)에 관한 논문이다. 본 논문의 루프-다이폴 방사패턴 재구성 안테나는 두 개의 RF 스위치를 사용하여 서로 반대방향의 두 가지 방사패턴을 구현한다. 방사패턴 재구성 안테나는 블루투스 (Bluetooth) 통신 대역 (2.4 - 2.485 GHz)을 사용하며, 최대이득은 1.96 dBi이다. SAR 시뮬레이션 결과로 블루투스 입력 평균전력 0.04 W가 팔목을 포함하는 인체 내 다섯 개 부위 (두부, 가슴, 배, 등, 팔목)에 입력되었을 때 Federal Communication Commission (FCC)의 기준인 단위 1 g 당 1.6 W/kg을 모두 만족함을 확인하였다. 또한 최대 SAR 값은 두부에서 1.12 W/kg이다.

• Journal of information and communication convergence engineering
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• 제10권2호
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• pp.123-128
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• 2012

In communication systems, there are various types of microstrip antenna that can be used for many applications. This paper mainly focuses on the simple design of an inset rectangular microstrip patch antenna to operate at a frequency of 2.45 GHz for rectenna design. The study involves using an high frequency structure simulator to design the antenna dimensions and to determine its performance. This antenna is based on a thickness of 1.6 mm flame retardant 4 (FR-4) substrate having a dielectric constant of approximately 4.7, an inset feed, and a ground plane. After simulation, the antenna performance characteristics such as its return loss, voltage standing wave ratio, gain, and radiation pattern were obtained and compared with the fabricated measured antenna.

• 한국정보처리학회논문지
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• 제7권5호
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• pp.1426-1433
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• 2000

As distributed computing systems become popular, many modeling techniques and methods have been developed in specify the specification formally and verify the distributed/concurrent sytems. In spite of importance of communication in distributed object-oriented systems, specifying of communication method generally has not been emphasized in the design phase. One reason is due to the system designer misunderstanding, that is, a specification needs to be independent on the implementation. However, since defining communication pattern indistributed object-oriented systems is more serious than the required message passing method in the design phase. specifying the communication pattern is necessary instead of postponing until the implementation. In this paper, two formal specification techniques, temporal logic method and Petri nets method, for the communication in distributed systems are discussed. One is based on the temporal logic, which specifies the different patterns of primitive predicates. This method enable to define the underlying mechanism which can be interpreted as constraints. The Petri net method helps to specify the dynamic behavior of communicational patterns using the properties of Petri nets.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2002년도 ITC-CSCC -2
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• pp.1256-1259
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• 2002

In this paper, we have proposed license plate recognition system for multi-national vehicle license plate using geometric features along with hybrid and seven segment pattern vectors. In the proposed system, we suggested to find horizontal and vertical relation after going through preparation process with inputted real-time license plate image of Korea and Japan, and then to classify license plate with using characteristic and geometric information of license plates. It classifies the extracted license plate images into letters and numbers, such as local name, local number, classification character and license consecutive numbers, and recognize license plate of Korea and Japan by applying hybrid and seven segments pattern vectors to classified letter and number region. License plate extraction step of the proposed system uses width and length information along with relative rate of Korean and Japanese license plate. Moreover, it exactly segmentation by letters with using each letter and number position information within license plate region, and recognizes Korean and Japanese license plates by applying hybrid and seven segment pattern vectors, containing characteristics related to letter size and movement within segmented letter area. As the result of testing the proposed system in real experiment, it recognized regardless of external lighting conditions as well as classifying license plates by nations, Korea and Japan. We have developed a system, recognizing regardless of inputted structural character of vehicle licenses and external environment.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제5권10호
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• pp.1712-1732
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• 2011

Cloud provides dynamically scalable virtualized computing resources as a service over the Internet. To achieve higher resource utilization over virtualization technology, an optimized strategy that deploys virtual machines on physical machines is needed. That is, the total number of active physical host nodes should be dynamically changed to correspond to their resource usage rate, thereby maintaining optimum utilization of physical machines. In this paper, we propose a pattern-based prediction model for resource provisioning which facilitates best possible resource preparation by analyzing the resource utilization and deriving resource usage patterns. The focus of our work is on predicting future resource requests by optimized dynamic resource management strategy that is applied to a virtualized data center in a Cloud computing environment. To this end, we build a prediction model that is based on user request patterns and make a prediction of system behavior for the near future. As a result, this model can save time for predicting the needed resource amount and reduce the possibility of resource overuse. In addition, we studied the performance of our proposed model comparing with conventional resource provisioning models under various Cloud execution conditions. The experimental results showed that our pattern-based prediction model gives significant benefits over conventional models.