• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2002.05a
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• pp.219-222
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• 2002

현재 인간처럼 직립 보행을 하거나 강아지처럼 인간과 함께 공존하도록 고안된 다양한 형태의 로봇이 개발되고 있다. 인간에게 보다 친숙한 로봇의 시대가 도래한 것이다. 본 논문에서는 뱀처럼 동작할 수 있는 뱀 형태의 로봇을 구현하고자 한다. 각 모듈은 수직, 수평 이동의 동작을 할 수 있는, 2 DOF를 가지는 모듈을 구성하였다. 여러 개의 모듈의 동작을 동시에 제어 합으로써 뱀의 다양한 동작을 구현하였으며 시각정보의 입력을 받아 물체의 색상과 물체의 형태를 인식할 수 있도록 구현하였다. 각 모듈에서는 2개의 모터 제어기를 내장하고 있으며, 전체 모듈의 제어를 담당하는 중앙처리 장치에서는 실시간 각 모듈의 모터에 동작 신호를 전달하도록 구성하였다. 생물학적으로 관찰한 결과 뱀의 이동은 이동 지점의 환경에 따라 매우 다양하다. 사막에서의 이동과 정글에서의 이동이 다른 형태로 이루어짐을 알 수 있다. 이에, 본 논문에서는 뱀의 다양한 이동 동작을 모방하도록 각 모듈을 제어하였으며, 전체 동작을 관찰하였다. 로봇의 구현 결과 뱀의 이동시 보이는 다양한 동작과 유사한 형태의 동작을 구현할 수 있다

• 전기의세계
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• v.23 no.1
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• pp.29-33
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• 1974

의용생체공학은 생체시스템에 대한 생물학적, 의학적인 지식과 공학기술을 응용하여 이들 개개의 시스템을 조화시키고, 도 생체시스템과 공학시스템간의 기능조화를 시키며, 양 시스템에 존재하는 환경의 조화를 추구하는 학문이다. 이렇게 볼때 응용생체공학에서 다루는 분야는 크게 4가지로 나눌 수 있게 된다. 1. 생체시스템의 계측, 진단 및 치료에 공학적 수법(수단, 기술, 장치등)을 사용하는 분야.. 의용전자공학, 2. 생체시스템을 공학적으로 해석하고 미지의 생체부분을 예측 또는 해명하는 분야, 사이버네틱스, 3. 생체시스템의 우수한 기능을 모방해서 새로운 공학시스템을 창조하는 분야, 바이오닉스, 4. 공학적 수법을 사용하여 생체기능에 적합한 공학시스템 또는 환경을 개량하는 분야, 인간공학, 환경공학, 그러므로 여기서는 의용생체공학에 속한 여러문제가 전기공학과 더불어 발전하여 온 과정을 먼저 더듬어 보고 전기공학분야와 관련을 갖고 다루어지고 있는 과제를 중심으로 살펴보고져 한다.

• Journal of KIISE:Software and Applications
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• v.35 no.6
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• pp.347-356
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• 2008

High-throughput microarray is one of the most popular tools in molecular biology, and various computational methods have been developed for the microarray data analysis. While the computational methods easily extract significant features, it suffers from inferring modules of multiple co-regulated genes. Hypernetworhs are motivated by biological networks, which handle all elements based on their combinatorial processes. Hence, the hypernetworks can naturally analyze the biological effects of gene combinations. In this paper, we introduce a hypernetwork classifier for microRNA (miRNA) profile analysis based on microarray data. The hypernetwork classifier uses miRNA pairs as elements, and an evolutionary learning is performed to model the microarray profiles. miTNA modules are easily extracted from the hypernetworks, and users can directly evaluate if the miRNA modules are significant. For experimental results, the hypernetwork classifier showed 91.46% accuracy for miRNA expression profiles on multiple human canters, which outperformed other machine learning methods. The hypernetwork-based analysis showed that our approach could find biologically significant miRNA modules.

• Korean Journal of Environmental Biology
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• v.38 no.4
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• pp.554-562
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• 2020

Tremex fuscicornis (Siricidae), known as the xylophagous horntail, and Leucospis japonica (Leucospidae), known as the parasitoid wasp, are wood-boring wasps belonging to the order Hymenoptera. These insects are interesting sources of biological inspiration for the development of drilling mechanisms. To study the biomimicry aspects, the morphological characters of the ovipositor of T. fuscicornis and L. japonica were analyzed using a stereoscopic microscope, a field emission scanning electron microscope, and an optical microscope. There were many differences in the ovipositors between the two species, such as shape, length, surface structure, and arrangement of the teeth. Evenly arranged teeth were developed at the tip of both the dorsal valve and the ventral valve of the ovipositor of T. fuscicornis and looked like a rotating drill bit. In contrast, in L. japonica, the teeth, which looked like a saw, were found only on the ventral valve. Moreover, the tip of the ovipositor of T. fuscicornis was symmetrically divided into four parts, while that of L. japonica was divided into three parts having a 2:1:1 ratio. However, in the case of T. fuscicornis, after the 14th tooth, four parts melded into three parts maintaining a 2:1:1 ratio, and a dovetail joint was found on the horizontal cross-section of the ovipositor that allowed vertical movement for making a hole. These morphological differences of the ovipositor may be due to the insects' lifestyles and phylogenetic distance. Finally, zinc was commonly found at the tip of the ovipositors of both species, a probable result of ecological adaptation created by drilling wood.

• Journal of the Institute of Electronics and Information Engineers
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• v.50 no.8
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• pp.264-273
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• 2013

The importance of the robots has emerged as the means of minimizing the casualties in the future war, and, thus, the biomimetic robots mimicking the optimized organisms has been actively studied. The robot inspired lizard is suitable for reconnaissance and the surveillance in narrow areas. In this paper, we analyzed the locomotion of a lizard by motion capture system using the infrared markers. We attached 21 markers to the joints of the lizard. By considering the measured data, we analyzed the walking motion of the lizard which trots in a sprawled posture. Moreover, we proposed the 25 dof kinematic model which was able to reproduce the gait of the lizard faithfully. The model was verified by simulations.

• Journal of the Korean Academy of Esthetic Dentistry
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• v.24 no.1
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• pp.39-48
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• 2015

The critical factors affecting the esthetics of anterior implants can be summarized as following: 1) Correct positioning of implant fixture, 2) Enough amount of alveolar bone, 3) Optimum volume of soft tissue. The position of implant is probably the most important factor in obtaining esthetic treatment outcome. The 3-dimensional orientation of implant is determined by the position on the alveolar ridge and its direction. Clinicians often try to mimic natural teeth when fabricating restorations. During the course of esthetic diagnosis and treatment, however, one should not forget to consider the correlation between facial pattern, lips, gingiva, alveolar ridge, as well as remaining dentition. Since anterior region is biologically unfavorable when compared with posterior region, one minor discrepancy in positioning of implant can cause esthetically undesirable treatment outcome. If one understands the biological and prosthetic meaning of implant' s 3-dimensional position, he or she can achieve superior esthetic outcome in anterior region.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.40 no.10
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• pp.2054-2061
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• 2015

Biologically inspired modeling techniques have received considerable attention for their robustness, scalability, and adaptability with simple local interactions and limited information. Among these modeling techniques, Gene Regulatory Networks (GRNs) play a central role in understanding natural evolution and the development of biological organisms from cells. In this paper, we apply GRN principles to the WSN system and propose a new GRN model for decentralized node scheduling design to achieve energy balancing while meeting delay requirements. Through this scheme, each sensor node schedules its state autonomously in response to gene expression and protein concentration, which are controlled by the proposed GRN-inspired node scheduling model. Simulation results indicate that the proposed scheme achieves superior performance with energy balancing as well as desirable delay compared with other well-known schemes.

• Archives of design research
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• v.18 no.2 s.60
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• pp.79-90
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• 2005

The aim of this study was to investigate how the psychological factors of human interrelation or human socialization are associated with the visual design based on sociological and psychological theories. To accomplish this goal, human socialization was examined on the basis of physiology, philosophy, and psychology. Then a case study was employed to assess how they function in the area of visual design. In literature, the sources of psychological factors of human socialization were categorized into 11 items including the sexual hedonic pursuit. These items were used for the evaluation of 40 printed media advertisements, all of which were the winners of the Korea Advertising Awards from 1994 to 2003. As a result, it was revealed that most advertisements responded to the items of adaptive value and cultural imprinting as biological bases. Also, it was discovered that the existential foundation of advertising has been based on mutual distrust and the payoff matrix as a mind of social unrest. In conclusions, it was illustrated that future advertising will remain based on adaptive value, cultural imprinting, social learning, and imitation learning, as long as advertising continue to hold its reason for existence.

• Proceedings of the Korean Institute of Intelligent Systems Conference
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• 2005.11a
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• pp.381-384
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• 2005

현존하는 정보처리 시스템 중에서 가장 뛰어난 성능을 지니고 있는 것은 인간의 두뇌라고 할 수 있다. 두뇌의 정보처리 메커니즘을 보다 정확하게 구현할 수 있는 시스템은 입력에 대한 정확한 인지 능력, 상황 판단 능력, 학습 및 추론 능력, 출력의 결정 능력 등의 성능 구현은 물론이며, 감정과 비교될 수 있는 시스템의 상태를 평가하여 판단 및 결정에 적용함으로써 매우 뛰어난 지능형 시스템이 쥘 수 있다. 이러한 뇌 정보처리 시스템의 구현에 앞서 본 논문에서는 생물학적인 대뇌 피질의 구조를 살피고 정보의 처리 영역을 고찰하고 정보의 흐름을 소개하였으며 이를 바탕으로 뇌 정보처리 메커니즘을 공학적인 측면에서 해석해 보았다. 특히, 뇌 영역의 기능 및 구조적인 특징, 정보의 처리과정 등을 공학적으로 해석하였으며 이는 뇌의 기능을 모방한 공학적인 모델을 구현하는데 있어서 기초가 될 것이다.

• Korean Chemical Engineering Research
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• v.59 no.1
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• pp.112-117
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• 2021

In this study, a method of self-assembly of peptides based on irreversible covalent bonds was studied by mimicking a biological covalent bond, dityrosine bond. A tyrosine-rich short peptide monomer having the sequence of Tyr-Tyr-Leu-Tyr-Tyr (YYLYY) was selected to achieve a high-density of dityrosine bond. The peptide nanoparticles covalently self-assembled with dityrosine bonds were synthesized by one-step photo-crosslinking of a peptide using a ruthenium catalyst under visible light. The effect of the concentration of each component for the size of the peptide nanoparticle was studied using dynamic light scattering, UV-Vis spectroscopy, and transmission electron microscopy. As a result, the synthesis conditions for size of the peptide nanoparticles ranging from 130 nm to 350 nm were optimized.