• 제목/요약/키워드: KAI-1

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영상분할의 최적 임계치를 구하는 빠른 방법 (A Fast Method for Finding the Optimal Threshold for Image Segmentation)

  • 신용식;이정훈
    • 한국지능시스템학회:학술대회논문집
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    • 한국퍼지및지능시스템학회 2001년도 추계학술대회 학술발표 논문집
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    • pp.109-112
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    • 2001
  • 영상분할에 있어서 최적의 임계치를 구하는 것은 영상을 구성하고 있는 픽셀들을 의미있는 집단으로 나누는 거와 같으며 이를 위하여 퍼지화 정도를 측정하여 최소의 퍼지화 정도를 갖는 임계치를 최적의 임계치로 설정한다. 일반적으로 소속도는 하나의 픽셀과 그 픽셀이 속한 영역의 관계로 표현될 수 있는데 소속도 계산을 위한 엔트로피로 샤논(Shannon)함수를 사용한다[1]. Liang-Kai Huang에 의하여 제안된 알고리즘은 그 수렴속도 면에 있어서 많은 문제점을 갖고 있다[2]. 본 논문에서는 이런 수렴속도를 좀더 개선하기 위하여 SPOI(Simplified Fixed Point Iteration)를 제안하고 여러 가지 실험영상을 사용하여 졔안된 논문의 우수성을 보이고자 한다. 실험결과 적절한 임계치를 구하면서도 기존의 논문보다 속도면에서 상당히 우수한 특성을 보이고 있다.

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Isolation, Identification, and Expression of Microbial Cellulases from the Gut of Odontotermes formosanus

  • Duan, Jiwei;Liu, Jun;Ma, Xueling;Zhang, Yue;Wang, Xiaohua;Zhao, Kai
    • Journal of Microbiology and Biotechnology
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    • 제27권1호
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    • pp.122-129
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    • 2017
  • Termites are destructive to agriculture, forestry, and buildings, but they can also promote agro-ecosystem balance through the degradation of lignocellulose. Termite-triggered cellulose digestion may be clarified through microbial metabolism of cellulose products. In the present study, we characterized the activities of cellulase and its three components synthesized by the cellulase-producing fungal strain HDZK-BYTF620 isolated from the gut of Odontotermes formosanus. The protein components of cellulases were synthesized by strain HDZK-BYTF620, which were isolated and characterized using polyacrylamide gel electrophoresis, and the expression of the cellulases was studied at the proteome level.

군용항공기 연구개발 사업 사례분석 (A Case Study on the R&D Programs of Fighter & Attacker Aircraft)

  • 이성은;권용수
    • 시스템엔지니어링학술지
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    • 제5권1호
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    • pp.7-20
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    • 2009
  • This paper describes a case study on the R&D programs of fighter and attacker aircraft such as F-22A, F/A-18E/F, and T/A-50. F-22A and F/A-18E/F were developed in same age. The performance of each program was, however extremely different. F-22A program results in a lot of cost overrun and schedule delay. On the other hand F/A-18E/F program met the cost, schedule, and performance goals. In the T/A-50 program with a super-sonic advanced trainer, T-50 was also developed successfully on planned cost and time by Korea Air-force and KAI. This paper derives key elements for the success of the military aircraft R&D program through lessons learned from th e case study. Each program is analyzed in terms of its background, planning and management.

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Performance Study on ZigBee-Based Wireless Personal Area Networks for Real-Time Health Monitoring

  • Koh, Bernard Kai-Ping;Kong, Peng-Yong
    • ETRI Journal
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    • 제28권4호
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    • pp.537-540
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    • 2006
  • When multiple ZigBee wireless personal area networks (WPANs) are in close proximity to each other, contentions and collisions in transmissions will lead to increased packet delays. However, there is no existing study on how delay performance would be affected in a crowded real-life environment where each person walking down a busy street would be wearing a ZigBee WPAN. This letter studies the use of ZigBee WPANs in such a real-life environment for real-time heart beat monitoring. To be pragmatic, we derived a mobility pattern from the analysis of a real-life video trace. Then, we estimated the delay performance from the video trace by combining data collected from ZigBee experiments. The results show that the 300 ms packet delay requirement will not be met for only 11% of the time. When failure occurs, it will last for an average duration of 1.4 s.

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Fabrication of Polymer TFT Arrays on Plastic Substrates Using a Low Temperature Manufacturing Process

  • Kao, Chi-Jen;Wang, Yi-Kai;Peng, Yu-Rung;Yang, Tsung-Hua;Hu, Tarng-Shiang;Hou, Jack
    • 한국정보디스플레이학회:학술대회논문집
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    • 한국정보디스플레이학회 2008년도 International Meeting on Information Display
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    • pp.1568-1570
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    • 2008
  • In this paper, fabrication of a $60{\times}48$ polymer TFT array with a top-gate structure on plastic substrates using a low temperature printing process will be presented and the device structure and manufacturing processes will be discussed. The polymer TFT array showed excellent air stability and uniform electrical characteristics over a large area. Finally, a 1.5 inch EPD display with 50 dpi resolution using the polymer TFT array will be demonstrated for e-film device applications.

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중국 연변 조선족 별거가족과 동거가족 유아의 가족생활 경험 (Korean-Chinese Children's Family Life in Yan-Bian, China : Separated From or Living with Their Parents)

  • 윤갑정;정계숙
    • 아동학회지
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    • 제28권4호
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    • pp.169-185
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    • 2007
  • Participant observations, in-depth interviews, and analyses of documents were used for collecting data. Children separated from their parents were living with grandparents because their parents were working abroad. Results included socio-cultural and psycho-social factors. (1) The socio-cultural grounded factors or the common characteristics of young children's family life in both living circumstances included early childhood academic achievement orientation, demands of responsibility and obedience, limited opportunity for social development, and societal phenomenadeveloping wide family concept affected by China's Confucianism and Korean-Chinese social culture. (2) Psycho-social grounded factors included the present care-givers' perceptions of the child's agency and their beliefs in the importance of play and friendship. This affected interactions between child and care-giversand child's self-esteem and friendships.

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『[송판(宋板)] 상한론(傷寒論)』 서지(書誌) (A Bibliographical Study on the Song Dynasty Edition of Shanghanlun)

  • 마야나기 마코토
    • 한국의사학회지
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    • 제22권1호
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    • pp.25-30
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    • 2009
  • Shanghanlun is a medical text published by the Jiaozhengyishuju in 1065 A.D. during the Northern Song dynasty. The first edition featured larger characters but in 1088, a version with smaller characters was published with reduced price. This study compared various versions of Shanghanlun to clarify its system. Especially the alteration in the Chinese version by Jhao Kai Mei was comparatively analysed by the shape of letters and specific marks. Also, information on the various publications in Japan is included in this study, which we believe will be the logical outline for comprehensive understanding on the propagation and progression of Shanghanlun in East Asian region.

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Turning Dynamics and Equilibrium of Two-Wheeled Vehicles

  • Chen Chih-Keng;Dao Thanh-Son;Yang Chih-Kai
    • Journal of Mechanical Science and Technology
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    • 제19권spc1호
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    • pp.377-387
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    • 2005
  • The equations of motion of two-wheeled vehicles, e.g. bicycles or motorcycles, are developed by using Lagrange's equations for quasi-coordinates. The pure rolling constraints between the ground and the two wheels are considered in the dynamical equations of the system. For each wheel, two nonholonomic and two holonomic constraints are introduced in a set of differential-algebraic equations (DAE). The constraint Jacobian matrix is obtained by collecting all the constraint equations and converting them into the velocity form. Equilibrium, an algorithm for searching for equilibrium points of two-wheeled vehicles and the associated problems are discussed. Formulae for calculating the radii of curvatures of ground-wheel contact paths and the reference point are also given.

Expression of E. coli Phosphofructokinase Gene in an Autotrophic Bacterium Acidithiobacillus thiooxidans

  • Tian, Ke-Li;Lin, Jian-Qun;Liu, Xiang-Mei;Liu, Ying;Zhang, Chang-Kai;Yan, Wang-Ming
    • Journal of Microbiology and Biotechnology
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    • 제14권1호
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    • pp.56-61
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    • 2004
  • A plasmid pSDK-l containing the Escherichia coli phosphofructokinase-l gene (pfkA) was constructed, and transferred into extremely acidophilic Acidithiobacillus thiooxidans Tt-7 by conjugation with the aid of plasmid RP4 at a frequency of $10^{-5}$ per recipient. This plasmid was stable in A. thiooxidans. The pfkA gene from E. coli could be expressed in this obligately autotrophic bacterium, but the enzyme activity (21.6 U/g protein) was lower than that in E. coli (K12: 85.9 Dig protein; DF1010 carrying plasmid pSDK-l: 96.6 U/g protein). In the presence of glucose, the Tt-7 transconjugants consumed glucose, leading to a better growth yield.

The Development of the Distribution/VMI Game Based on Theory of Constraints

  • Zheng, Kai-Wen;Tsai, Chih-Hung;Li, Rong-Kwei;Chen, Ching-Piao;Tsai, Shih-Chieh
    • International Journal of Quality Innovation
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    • 제10권1호
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    • pp.53-76
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    • 2009
  • As the flourish of today's supply chain, the traditional model of replenishment will cause accumulation of excessive inventory to the retailers and customers, or cause shortages and inability to meet the demands. To solve this problem, Theory of Constraints (TOC) proposed the replenishment model of demand-pull, combined with the establishment of factory-ware-house to achieve performance improvement. In the absence of empirical research, this study applied the Bean Game developed by Dr. Goldratt to design a supply chain system for different scenarios, in order to allow players and managers better understanding and supporting the TOC replenishment method through the operations of the game.