• 대한전기학회:학술대회논문집
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• 대한전기학회 1995년도 하계학술대회 논문집 B
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• pp.1006-1010
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• 1995

This paper describes Sexual Reproduction Genetic Algorithm(SRGA) for function optimization. In SRGA, each individual utilize a diploid chromosome structure. Sex cells(gametes) are produced through artificial meiosis in which crossover and mutation occur. The proposed method has two selection operators, one, individual selection which selects the individual to fertilize, and the other, gamete selection which makes zygote for offspring production. We consider the effects of multi-selection and diploidy on search performance. SRGA improves local and global search(exploitation and exploration) and show optimum tracking performance in nonstationary environments. Gray coding is incorporated to transforming the search space and Genic uniform distribution method is proposed to alleviate the problem of premature convergence.

• 한국자동차공학회논문집
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• 제11권4호
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• pp.189-195
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• 2003

The steel wheels are widely used in the passenger cars because of their low cost of production although the aluminum wheels have many advantages in their performance and appearance. It is known that the steering wheel vibration with steel wheels is generated more often than one with aluminum wheels. Both the constant velocity driving test and the m up test are carried out in this study to analyze the causes and path of the steering wheel vibration generated from the steel wheels. And this study shows that the steering wheel vibration is affected by the fastening torque of the wheel mounting bolts between the steel wheel and the suspension disk.

• 수산해양기술연구
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• 제53권2호
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• pp.132-141
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• 2017

The objective of this study was to provide fundamental information on fish swimming behavioral properties. Acoustic data was collected at nighttime from the $10^{th}$ to $12^{th}$ March, 2016 near Yokji Island in the South Sea of South Korea, and was analyzed using the fish track technique. This technique is to identify groups of single targets, which shows a pattern of systematic movement. As a result, the differences of the behavioral properties such as depth, swimming speed, vertical direction, horizontal direction, tortuosity, and depth change among days were minor; however, statistical results (Welch analysis of variance) showed significant difference between days. Especially, the target strength (TS) of the $11^{th}$ were significantly different from the $10^{th}$ and $12^{th}$. It could be assumed that gizzard shad, which was the dominant species from the catch on the $11^{th}$ March, might have affected this difference. The correlation between TS and other properties was very week. The significant difference seemed even small differences of average values because of the large data volume.

• 한국정보통신학회논문지
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• 제20권4호
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• pp.755-762
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• 2016

모션그래픽이라는 분야는 그 역사가 오래되지 않았다. 최근 영상디자인이 부각되고 있는 것은 세계적인 추세이다. 이러한 세계적 흐름은 영화, 광고, 전시장 영상, 웹, 모바일, 게임영상 및 뉴미디어까지 그 영향을 미치고 있다. 또한 컴퓨터의 새로운 기술이 발달하면서 영상콘테츠의 VFX 분야가 급격하게 변화되고 있다. 이러한 제작기술은 실사와 C.G의 합성기법으로 가상과 허구의 개념을 초월함과 동시에 매치무빙 기술을 이용하여 그래픽과 현실공간에 사실적인 표현방법을 극대화하고 있다. 매치무빙 기술은 실사와 그래픽이 공존하기 위하서 실사카메라와 가상카메라의 합성을 정교하게 매칭하는 기술이다. 본 논문은 입체적 공간에서 매치무빙 기법을 활용하여 실사카메라의 움직임을 3D Layer 방법으로 이어받아 새로운 디자인과 결합된 모션그래픽 영상제작방법을 제안한다.

• 정보처리학회논문지D
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• 제16D권4호
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• pp.621-630
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• 2009

최근 RFID 기술과 기업정보시스템을 연계하여 사용하려는 많은 시도가 진행되어 왔다. 하지만, 대부분의 경우 동시에 많은 양의 인식할 수 있는 RFID의 기본적인 특징에만 충실했을 뿐, 리더로부터 생성되는 많은 양의 데이터에 대한 관리적인 측면을 고려하지 못하고 있다. 그 결과, 이러한 시스템을 통해 시간이나 흐름과 관련된 연속적이고 동적인 정보를 얻기가 어렵다. 본 논문에서는 대량의 RFID 데이터를 효율적으로 관리하기 위해 RFID 데이터 마이닝 기법의 하나인 경로 트리(PathTree)를 보완한 공정트리(Procedure Tree)라는 새로운 방법을 제안한다. 제안한 방법을 실제 기업 정보 시스템과 연계하여 실시간 공정 관리 시스템에 적용한 후 제안한 시스템의 효율성을 평가한다. 제안한 방법을 통해 기존 RFID 기반 생산관리 시스템이 하기 어려운 실시간 공정 관리를 위한 공정 흐름의 예측이나 추적과 같은 업무를 효과적으로 수행할 수 있었다.

• 패션비즈니스
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• 제23권4호
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• pp.127-139
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• 2019

Up-cycling has evolved from its original form of the simple recycling of waste, into an industry of its own that has been gaining momentum. In many developed industries, up-cycling is increasingly seen as an 'environmentally-friendly way of production and ethical way of consumption'. However, an examination of the designs of branded up-cycled products suggests that there is a need for product development fueled by further research on materials. The purpose of this study is to introduce various production methods that can overcome the shortcomings of using waste material and Korean motifs for use in product development, which ultimately contribute to enhancing the potential variety and character of up-cycled products. In order to do so, the up-cycling industry was examined to define key concepts, domestic and overseas markets were surveyed, and case analyses were conducted on domestic and foreign up-cycling brands. In addition, after tracking how leather is discarded and accumulated as waste and then collecting the discarded leather, the properties of the material were analyzed. A study of Korean motifs was followed by the concept summary, and upcycling design expressions that exemplify Korean images were identified. The following two novel methods were used to create six up-cycled bags using collected discarded leather. First, lucky bags and moon pots were selected from various Korean motifs in order to use motifs with identifiable features. Secondly, different variations of cutting and attachment methods were used, including iron mold production methods and presses.

• 대한조선학회논문집
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• 제60권5호
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• pp.367-374
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• 2023

As the Fourth Industrial Revolution accelerating, countries worldwide are developing technologies to digitize and automate various industrial sectors. Building smart factories not only reduces costs through improved process productivity but also allows for preemptive identification and removal of risk factors through the practice of Health, Safety, and Environment (HSE) management, thereby reducing industrial accident risks. In this study, we visualized pressure, temperature, power, and wind speed data measured in real-time via a monitoring GUI, enabling field managers and workers to easily access related information. Through the work environment monitoring system developed in this study, it is possible to conduct economic analysis on per-unit basis, based on the digitization of production management elements and the tracking of required resources. By implementing HSE in shipyards, potential risk factors can be improved, and gas and electrical leaks can be identified, which are expected to reduce production costs.

• International Journal of Internet, Broadcasting and Communication
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• 제16권1호
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• pp.106-123
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• 2024

This article takes the talk show "Beast Town" as an example to introduce the overall technical solution, technical difficulties and countermeasures for the combination of cartoon virtual characters and virtual studio technology, providing reference and experience for the multi-scenario application of digital humans. Compared with the live broadcast that combines reality and reality, we have further upgraded our virtual production technology and digital human-driven technology, adopted industry-leading real-time virtual production technology and monocular camera driving technology, and launched a virtual cartoon character talk show - "Beast Town" to achieve real Perfectly combined with virtuality, it further enhances program immersion and audio-visual experience, and expands infinite boundaries for virtual manufacturing. In the talk show, motion capture shooting technology is used for final picture synthesis. The virtual scene needs to present dynamic effects, and at the same time realize the driving of the digital human and the movement with the push, pull and pan of the overall picture. This puts forward very high requirements for multi-party data synchronization, real-time driving of digital people, and synthetic picture rendering. We focus on issues such as virtual and real data docking and monocular camera motion capture effects. We combine camera outward tracking, multi-scene picture perspective, multi-machine rendering and other solutions to effectively solve picture linkage and rendering quality problems in a deeply immersive space environment. , presenting users with visual effects of linkage between digital people and live guests.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2016년도 제50회 동계 정기학술대회 초록집
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• pp.96-96
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• 2016

Nanotechnology mostly employs nano-materials and nano-structures with distinctive properties based on their size, structure, and composition. It is quite difficult to produce nano-materials and nano-structures with identical sizes, structures, and compositions in large quantities, because of spatiotemporal fluctuation of production processes. In other words, fluctuation is the bottleneck in nanotechnology. We propose three strategies to suppress such fluctuations: employing 1) difference between linear and nonlinear phenomena, 2) difference in time constants, and 3) nucleation as a bottleneck phenomenon. We are also developing nano- and micro-scale guided assembly using plasmas as a plasma nanofabrication.1-5) We manipulate nano- and micro-objects using electrostatic, electromagnetic, ion drag, neutral drag, and optical forces. The accuracy of positioning the objects depends on fluctuation of position and energy of an object in plasmas. Here we evaluate such fluctuations and discuss the mechanism behind them. We conducted in-situ evaluation of local plasma potential fluctuation using tracking analysis of fine particles (=objects) in plasmas. Experiments were carried out with a radio frequency low-pressure plasma reactor, where we set two quartz windows at the top and bottom of the reactor. Ar plasmas were generated at 200 Pa by applying 13.56MHz, 450V peak-to-peak voltage. The injected fine particles were monodisperse methyl methacrylate-polymer spheres of $10{\mu}m$ in diameter. Fine particles were injected into the reactor and were suspended around the plasma/sheath boundary near the powered electrode. We observed binary collision of fine particles with a high-speed camera. The frame rate was 1000-10000 fps. Time evolution of their distance from the center of mass was measured by tracking analysis of the two particles. Kinetic energy during the collision was obtained from the result. Potential energy formed between the two particles was deduced by assuming the potential energy plus the kinetic energy is constant. The interaction potential is fluctuated during the collision. Maximum amplitude of the fluctuation is 25eV, and the average is 8eV. The fluctuation can be caused by neutral molecule collisions, ion collisions, and fluctuation of electrostatic force. Among theses possible causes, fluctuation of electrostatic force may be main one, because the fine particle has a large negative charge of -17000e and the corresponding electrostatic force is large compared to other forces.

• 한국수산과학회지
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• 제44권4호
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• pp.423-430
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• 2011

The most satisfactory split-beam transducer for fish sizing maintains a wide bearing angle region for correct fish tracking without interference from side lobes and lower sensitivity to fish echoes outside of the main lobe region to correctly measure the angular location of free-swimming fishes in the sound beam. To evaluate the performance of an experimentally developed 50 kHz split-beam transducer, the angular location of a target was derived from the electrical phase difference between the resultant signals for the pair of transducer quadrants in the horizontal and vertical planes consisting of 32 transducer elements. The electrical phase difference was calculated by cross-spectral density analysis for the signals from the pair of receiving transducer quadrants, and the directivity correction factor for a developed split-beam transducer was estimated as the fourth-order polynomial of the off-axis beam angle for the angular location of the target. The experimental results demonstrate that the distance between the acoustic centers for the pair of receiving transducer quadrants can be controlled to less than one wavelength by optimization with amplitude-weighting transformers, and a smaller center spacing provides a range of greater angular location for tracking of a fish target. In particular, a side lobe level of -25.2 dB and an intercenter spacing of $0.96\lambda$($\lambda$= wavelength) obtained in this study suggest that the angular location of fish targets distributing within a range of approximately ${\pm}28^{\circ}$ without interference from side lobes can be measured.