• Title/Summary/Keyword: Imitate

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Optimal Design for Flexible Passive Biped Walker Based on Chaotic Particle Swarm Optimization

  • Wu, Yao;Yao, Daojin;Xiao, Xiaohui
    • Journal of Electrical Engineering and Technology
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    • v.13 no.6
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    • pp.2493-2503
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    • 2018
  • Passive dynamic walking exhibits humanoid and energy efficient gaits. However, optimal design of passive walker at multi-variable level is not well studied yet. This paper presents a Chaotic Particle Swarm Optimization (CPSO) algorithm and applies it to the optimal design of flexible passive walker. Hip torsional stiffness and damping were incorporated into flexible biped walker, to imitate passive elastic mechanisms utilized in human locomotion. Hybrid dynamics were developed to model passive walking, and period-one gait was gained. The parameters global searching scopes were gained after investigating the influences of structural parameters on passive gait. CPSO were utilized to optimize the flexible passive walker. To improve the performance of PSO, multi-scroll Jerk chaotic system was used to generate pseudorandom sequences, and chaotic disturbance would be triggered if the swarm is trapped into local optimum. The effectiveness of CPSO is verified by comparisons with standard PSO and two typical chaotic PSO methods. Numerical simulations show that better fitness value of optimal design could be gained by CPSO presented. The proposed CPSO would be useful to design biped robot prototype.

An Artificial Adaptation Model by Means of the Endoparasitic Evolution Process (내부기생충의 진화과정을 모방한 인공적응 모형)

  • Kim, Yeo-Keun;Lee, Hyo-Young;Kim, Jae-Yun
    • Journal of Korean Institute of Industrial Engineers
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    • v.27 no.3
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    • pp.239-249
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    • 2001
  • Competitive coevolution models, often called host-parasite models, are searching models that imitate the biological coevolution that is a series of reciprocal changes in two competing species. The models are known to be an effective method of solving complex and dynamic problems such as game problems, neural network design problems and constraint satisfaction problems. However, previous models consider only ectoparasites that live on the outside of the host when designing the models, not considering endoparasites that live on the inside of the host. This has a limitation to exploiting some information. In this paper, we develop an artificial adaptation model simulating the process in which hosts coevolve with both ectoparasites and endoparasites. In the model, the endoparasites play important roles as follows. By means of them, we can keep the history on results of previous competition between hosts and parasites, and use endogeneous fitness, not exogeneous. Extensive experiments are carried out to show the coevolution phenomenon and to verify the performance of the proposed model. Nim game problems and neural network problems are used as test-bed problems. The results are reported in this paper.

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Generating a Ball Sport Scene in a Virtual Environment

  • Choi, Jongin;Kim, Sookyun;Kim, Sunjeong;Kang, Shinjin
    • KSII Transactions on Internet and Information Systems (TIIS)
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    • v.13 no.11
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    • pp.5512-5526
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    • 2019
  • In sports video games, especially ball games, motion capture techniques are used to reproduce the ball-driven performances. The amount of motion data needed to create different situations in which athletes exchange balls is bound to increase exponentially with resolution. This paper proposes how avatars in virtual worlds can not only imitate professional athletes in ball games, but also create and edit their actions effectively. First, various ball-handling movements are recorded using motion sensors. We do not really have to control an actual ball; imitating the motions is enough. Next, motion is created by specifying what to pass the ball through, and then making motion to handle the ball in front of the motion sensor. The ball's occupant then passes the ball to the user-specified target through a motion that imitates the user's, and the process is repeated. The method proposed can be used as a convenient user interface for motion based games for players who handle balls.

A Basic Study on the Variation of Temperature Characteristics for Attenuation Coefficient and Sound Velocity in Biological Tissues

  • Park, Heung-Ho
    • Journal of Biomedical Engineering Research
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    • v.14 no.3
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    • pp.273-282
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    • 1993
  • This study is concerned with the temperature dependence characteristics of ultrasound parameters in biological tissues, which are basic on the noninvasive deep body temperature estimation. Used parameters are ultrasonic attenuation coefficient and sound velocity In order to accomplishment our purpose, several signal processing methods were used. Attenua4iorl coefficient was estimated by spectral difference method and sound velocity was estimated by P-P method. And we also examined these methods through a series of IN VITRO experi mentis that used tissue-mimicking phantom samples and biological tissue samples. In order to imitate the biological soft tissue two kinds of phantom samples are used, one is agar phantom sample which is composed of agar, graphite, N-propyl alcohol and distilled water, and the other is fat phantom sample which is composed of pure animal fat. And the ultrasound transmission mode and reflection mode experiments are performed on the pig's spleen, kidney and fat. As a result, it is found that the temperature characteristics are uniform in case of phan- tom samples but not in biological tissues because of complicate wave propagation within them. Consequently, the possibility of temperature measurement using ultrasound on biological tissue is confirmed and its results may contribute to the establishment of reference values of internal temperature measurement of biological tissues.

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The Study of Vocalization for Korean Pop Music So-mo-ri Technique (가요 창법 연구 -소몰이 창법-)

  • Cho, Tae-Seon
    • Journal of the Korea Academia-Industrial cooperation Society
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    • v.13 no.6
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    • pp.2491-2496
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    • 2012
  • From the year 2000, an ironic phenomenon struck the Korean pop field with a number of male vocalists singing with similar voice tone colors and with almost the same vocal techniques. People called it "So-mo-ri", and this technique caught on with the public during that period of time. In the early 80s, plenty of vocalists tried to imitate Cho Yong-phil's singing method after his hit song 'Lady outside the window'. However, producing and releasing albums with the same singing method had never been done in history. In this study, I would like to analyse and conclude what the "So-mo-ri" technique was and how this technique began. I would further like to research the vocalization methods that were used.

Genetic Transformation of Geobacillus kaustophilus HTA426 by Conjugative Transfer of Host-Mimicking Plasmids

  • Suzuki, Hirokazu;Yoshida, Ken-Ichi
    • Journal of Microbiology and Biotechnology
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    • v.22 no.9
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    • pp.1279-1287
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    • 2012
  • We established an efficient transformation method for thermophile Geobacillus kaustophilus HTA426 using conjugative transfer from Escherichia coli of host-mimicking plasmids that imitate DNA methylation of strain HTA426 to circumvent its DNA restriction barriers. Two conjugative plasmids, pSTE33T and pUCG18T, capable of shuttling between E. coli and Geobacillus spp., were constructed. The plasmids were first introduced into E. coli BR408, which expressed one inherent DNA methylase gene (dam) and two heterologous methylase genes from strain HTA426 (GK1380-GK1381 and GK0343-GK0344). The plasmids were then directly transferred from E. coli cells to strain HTA426 by conjugative transfer using pUB307 or pRK2013 as a helper plasmid. pUCG18T was introduced very efficiently (transfer efficiency, $10^{-5}-10^{-3}\;recipient^{-1}$). pSTE33T showed lower efficiency ($10^{-7}-10^{-6}\;recipient^{-1}$) but had a high copy number and high segregational stability. Methylase genes in the donor substantially affected the transfer efficiency, demonstrating that the host-mimicking strategy contributes to efficient transformation. The transformation method, along with the two distinguishing plasmids, increases the potential of G. kaustophilus HTA426 as a thermophilic host to be used in various applications and as a model for biological studies of this genus. Our results also demonstrate that conjugative transfer is a promising approach for introducing exogenous DNA into thermophiles.

A Study on Algorithm of Pulmonary Blood Vessel Search Using Pyramid Images and Fuzzy Theory (피라미드 영상과 퍼지 이론을 이용한 흉부 혈관 성분의 검출에 관한 연구)

  • Hwang, Jun-Heoun;Im, Jung-Gi;Han, Man-Cheong;Min, Byoung-Goo
    • Proceedings of the KOSOMBE Conference
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    • v.1990 no.11
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    • pp.11-14
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    • 1990
  • The detection of pulmonary blood vessels is very difficult owing to their complex tree structures and different widths. In this paper, We propose a new detection algorithm. The motivation of this algorithm is that Han is the best detector. So, this algorithm is developed to imitate the human searching process. To realize it, the algorithm consist of two components. One is Pyramid Images whose one pixel is median value of four pixels of the previous low level. Searching gradually from high level to low level, We concentrate on global and main information of structure at the first. Then based on it, We search the detailed data in low level. The other is fuzzy logic which makes it easy to convert searching process expressed as human language into numeric multi_value. This algorithm showes speedy and robust results. But the more study on both human searching process and the detection of small part is needed.

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Development of an Integrated Power Market Simulator for the Korean Electricity Market

  • Hur Jin;Kang Dong-Joo;Moon Young-Hwan
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.416-424
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    • 2005
  • At present, the Korean electricity industry is undergoing restructuring and the Cost Based-generation Pool (CBP) market is being operated in preparation of a Two Way Bidding Pool (TWBP) market. In deregulated electricity industries, an integrated power market simulator is one of the tools that can be used by market participants and market operators analyzing market behaviors and studying market structures and market codes. In this regard, it is very important to develop an electricity market simulator that reflects market code providing a market operation mechanism. This paper presents the development of an integrated market simulator, called the Power Exchange Simulator (PEXSIM), which is designed to imitate the Korean electricity market considering the various features of the market operating mechanism such as uniform price and constrained on/off payment. The PEXSIM is developed in VB.NET and composed of five modules whose titles are M-SIM, P-SIM, O-SIM, T-SIM and G-SIM interfacing the Access database program. To verify the features and the performance of the PEXSIM, a small Two Way bidding market with a 12-bus system and a One Way bidding market for generator competition will be presented for the electricity market simulations using PEXSIM.

Frontal Plane Motion with Pelvis and Waist Joint Rotations in Bipedal Walking

  • Ha, Tae-Sin;Kim, Joo-Hyung;Choi, Chong-Ho
    • 제어로봇시스템학회:학술대회논문집
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    • 2005.06a
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    • pp.2248-2253
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    • 2005
  • Although the progress in bipedal walking is impressive in recent years, biped robots still require very high torque and can walk only for a short time interval with their internal batteries. Therefore, further research needs to be carried out to enhance walking efficiency of these robots. In order to achieve this goal, we attempt to imitate human walking with pelvis and waist joint rotations in the frontal plane. In order to investigate the effect of the pelvis and waist joint rotations in the frontal plane motion, we study the frontal plane model with a triangular structure made up of a waist joint and two hip joints. Through simulation, we show that the pelvis rotation can reduce the maximum torque and the control effort, and the waist joint rotation can reduce the trunk sway caused by the pelvis rotation. The combination of these two rotations makes the bipedal walking in the frontal plane more efficient.

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A Study on the Process of Development and the Historical Background of Thailand Modern Architecture, from the late 18C to the early 20C (태국 근대건축의 역사적 배경과 초기 형성과정 고찰 - l8C 말-20C 초를 중심으로 -)

  • Park, Soon-Kwan;Kim, Kyung-Soo
    • Journal of architectural history
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    • v.5 no.2 s.10
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    • pp.53-68
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    • 1996
  • This study is on the early historical background and the process of development of modern architecture in Thai, during the period from 1782(King Rama 1) to 1934(King Rama 7). Thai started tn form a connection with western nations from the late 18C, founded the Bangkok Dynasty. Since then, Thai was increasingly influenced by western civilization and this trend included an increasing influence of western architecture. In this paper, the centeral objective is to observe the architectural change during the period from King Rama 1(1782-1809) to King Rama 7(1925-1934). This can be divided into three period. During the first period, from King Rama 1 to King Rama 3(1824-1851), Thai architecture showed a tendency to follow the preceding traditional example and to imitate Chinese architecture. The second period is from King Rama 4(1851-1868) to King Rama 5(1868-1910). During this period, Thai architectural design was increasingly influenced by western concepts, specially European Neo-classicism Style. During the third period, from King Rama 6(1910-1925) to King Rama 7(1925-1934), Thu had been enjoying extensive commerce with western nations. The great developments in the field of architecture during this reign were apparent in the construction of public utilities and facilities. These buildings were designed by western architects. At this time, modern architectural concept of western was introduced.

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