• 한국컴퓨터그래픽스학회논문지
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• 제29권3호
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• pp.69-77
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• 2023

본 연구는 몰입형 가상환경에서의 가상현실 사용자의 사회적 현존감을 높이고 다양한 경험을 제공하기 위하여 강체 추적 기반의 가상 아바타 응용 방법을 제안한다. 제안하는 방법은 마커를 사용한 모션 캡처 기반의 실시간 강체 추적을 기반으로 역운동학을 통해 가상 아바타의 동작을 추정한다. 이를 통해 현실 세계에서의 간단한 객체 조작으로 몰입감 높은 가상환경을 설계함을 목적으로 한다. 가상 아바타를 통한 몰입형 가상환경에 관한 응용을 실험 및 분석하기 위하여 과학실험 교육 콘텐츠를 제작하고 시청각 교육, 전신 추적, 그리고 제안하는 강체 추적 방법과의 설문을 통해 비교 분석하였다. 제안한 가상환경에서 참가자들은 가상현실 HMD를 착용하고 추정된 동작으로부터 실험 교육 행동을 수행하는 가상 아바타로부터 몰입과 교육 효과를 확인하기 위한 설문을 진행하였다. 결과적으로 강체 추적 기반의 가상 아바타를 활용하는 방법을 통해 전통적인 시청각 교육보다 높은 몰입과 교육 효과를 유도할 수 있었으며, 전신 추적을 위한 많은 작업 없이도 충분히 긍정적인 경험을 제공할 수 있음을 확인하였다.

• 만화애니메이션 연구
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• 통권50호
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• pp.101-130
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• 2018

스마트 기기의 등장 후 웹툰을 스마트폰으로 보는 독자가 증가하게 되면서, 스마트툰, 효과툰, 컷툰, 더빙툰, 무빙툰, AR툰, VR툰, 인터랙션 툰 등 다양한 첨단기술이 결합된 기술 융합형 웹툰들이 선보이고 있다. 그러나 이에 대한 연구는 멀티미디어 기술 융합 유형과 사례 제시, 연출 효과와 그에 따른 문제점 제시 정도로, 만화와 기술과의 융합이 독자의 만화 읽기와 몰입에 어떤 영향을 끼치는지에 대한 논의는 없었다. 그래서 본 연구에서는 몰입의 관점에서 만화만의 독특한 몰입방식을 알아보고, 기술 융합형 웹툰들이 시도한 몰입 양상과 문제점을 유형별로 분석해보았다. 또한 이를 바탕으로 최근 화제가 되고 있는 인터랙션 툰 <마주쳤다>의 인터랙션 요소와 몰입 양상을 분석해 봄으로써 첨단 기술을 통해 새롭게 시도 되고 있는 인터랙션 요소들이 웹툰의 몰입에 미치는 긍정적 효과와 한계점에 대해 논하였다. 몰입의 관점에서 기술 융합형 웹툰을 유형별로 분석해보면, 효과툰은 멀티미디어 효과가 과하게 사용될 경우 정보의 과부하를 일으켜 몰입을 방해하였다. 스마트 모바일 기기의 가로 읽기 방식에 맞춰 칸에 움직임을 부여한 스마트툰은 그 시도는 좋았으나, 독자의 능동적인 만화 읽기를 방해하여 몰입감을 떨어트렸다. VR 기기를 이용해 독자가 직접 웹툰 세계를 탐색하도록 한 VR툰 역시 웹툰의 세로 연출을 극복하려는 시도는 좋았으나, 주의 집중을 분산시킴으로써 만화의 몰입을 저해하였다. 만화 읽기 방식의 편이성만을 중시한 무빙툰은 독자의 만화 읽기의 자율성을 침해함으로써 몰입을 방해하는 요소로 작용하고 있다. 반면 하일권의 인터랙션 툰 <마주쳤다>는 얼굴인식 기술, 증강현실 기술, 360도 파노라마 기술, 햅틱기술 등 웹툰에 다양한 첨단 기술을 접목하여, 독자가 웹툰 캐릭터와의 관계에서 친밀감을 형성하고, 독자 스스로가 주인공과 동일시되어 캐릭터와 상호작용함으로써 몰입을 유도하는데 성공하고 있다. 다만, 작품 후반부에 나타나는 기술의 남용과 이를 위한 무리한 상황 연출, 지루한 스토리 전개 등이 한계점으로 남는다.

• 대한치과보철학회지
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• 제33권3호
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• pp.584-609
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• 1995

The purpose of this study was to evaluate the difference of the galvanic corrosion behaviour of the titanium in contact with gold alloy, silva-palladium alloy, and nickel-chromium alloy using the immersion and electrochemical method. And the effects of galvallit couples between titanium and the dental alloys were assessed for their usefulness as materials for superstructure. The immersion method was performed by measuring the amount of metal elementsreleased by Inductivey coupled plasma emission spectroscopy(ICPES) The specimen of fifteen titanium plates, the five gold alloy, five silver-palladium, five nickel-chromium plates, and twenty acrylic resin plates ware fabricated, and also the specimen of sixty titanium plugs, the thirty gold alloy, thirty silver-palladium, and nickelc-hromium plugs were made. Thereafter, each plug of gold alloy, silver-palladium, and nickel-chromium inserted into the the titanium and acrylic resin plate, and also titanium plug inserted into the acrylic resin plate. The combination specimens uf galvanic couples immersed in 70m1 artificial saliva solution, and also specimens of four type alloy(that is, titanium, gold, silver-palladium and nickel-chromium alloy) plugs were immersed solely in 70m1 artificial sativa solution. The amount of metal elements released was observed during 21 weeks in the interval of each seven week. The electrochemical method was performed using computer-controlled potentiosta(Autostat 251. Sycopel Sicentific Ltd., U.K). The wax patterns(diameter 11.0mm, thickness,in 1.5mm) of four dental casting alloys were casted by centrifugal method and embedded in self-curing acrylic resin to be about $1.0cm^2$ of exposed surface area. Embedded specimens were polished with silicone carbide paper to #2,000, and ultrasonically cleaned. The working electrode is the specimen of four dental casting alloys, the reference electrode is a saturated calmel electrode(SCE) and the ounter electrode is made of platinum plate. In the artificial saliva solution, the potential scanning was carried out starting from-700mV(SCE) TO +1,000mV(SCE) and the scan rate was 75mV/min. Each polarization curve of alloy was recorded automatically on a logrithmic graphic paper by XY recorder. From the polarization curves of each galvanic couple, corrosion potential and corrosion rates, that is, corrosion density were compared and order of corrosion tendency was determined. From the experiments, the following results were obtained : 1. In the case of immersing titanium, gold alloy, silver-palladium alloy, and nickel-chromium alloysolely in the artificial saliva solution(group 1, 2, 3, and 4), the total amount of metal elements released was that group 4 was greater about 2, 3 times than group 3, and about 7.8 times than group 2. In the case of group 1, the amount of titanium released was not found after 8 week(p<0.001). 2. In the case of galvanic couples of titanium in contact with alloy(group 5, 6), the total amount of metal elements released of group 5 and 6 was less than that of group 7, 8, 9, and 10(p<0.05). 3. In the case of galvanic couples of titanium in contact with silver-palladium alloy(group 7, 8), the total amount of metal elements released of group 7 was greater about twice than that of group 5, and that of group 8 was about 14 times than that of group 6(p<0.05). 4. In the case of galvanic couples of titanium in contact with nickel-chromium alloy(group 9, 10), the total amount of metal elements released of group 9 and 10 was greater about 1.8-3.2 times than that of group 7 and 8, and was greater about 4.3~25 times than that of group 5 and 6(p<0.05). 5. In the effect of galvanic corrosion according to the difference of the area ratio of cathode and anode, the total amount of metal elements released was that group 5 was greater about 4 times than group 6, group 8 was greater about twice than group 7, and group 10 was greater about 1.5 times than group 9(p<0.05). 6. In the effect of galvanic corrosion according to the elasped time during 21 week in the interval of each 7 week, the amount of metal elements released was decreased markedly in the case of galvanic couples of the titanium in contact with gold alloy and silver-palladium alloy but the total amount of nickel and beryllium released was not decreased markedly in the case of galvanic couples of the titanium in contact with nickel-chromium alloy(p<0.05). 7. In the case of galvanic couples of titanium in contact with gold alloy, galvanic current was lower than any other galvanic couple. 8. In the case of galvanic couples of titanium in contact with nickel-chromium alloy, galvanic current was highest among other galvanic couples.

• 한국수소및신에너지학회논문집
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• 제8권4호
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• pp.161-171
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• 1997

$AB_2$ type Zr-based Laves phase alloys have been studied for potential application as negative electrode in Ni/MH batteries. However, They have a serious disadvantage of poor activation behavior in KOH solution. In this work, a new method of alloy design method was tried for improving Zr-based alloy activation. this method has focused on phase controlling to make multi-phase microstructure. In the case of multi-phase Zr-V-Mn-Ni shows good performance in activation, but activation mechanism has not been known. So, we were in search of elucidating this mechanism, Using morphological and electrochemical analysis, we could find that surface morphology and electocatalytic activity of the alloy change during immersion in KOH solution. V-rich second phases are selectively corroded and dissolved and then become Ni-rich phases. Resulting from these surface reaction in KOH solution, self-hydrogen charging occurs through Ni-rich phase. However, the alloy has poor cyclic durability because of such a corrosion mechanism. Therefore, finally we developed durable alloys by substitution of other alloying element.

• 한국가금학회지
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• 제24권1호
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• pp.9-15
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• 1997

This experiment was carried out to investigate the effects on shelf-life of chilling and packing methods of cold chicken breast and thigh meats. Deboned chicken breast and thigh meats were packed by either vacuum or atmosphere packing method, and stored at -2˚C for 1, 3, 7, 11, 15, and 20 days. The thiobarbituric acid(TBA) values of all treatments were significantly increased as the storage period extended(P<0.05), however, TBA values of all treatments were remark-ably decreased at 15 days. TBA values of immersion chilled and vacuum-packed thigh meats were increased, but no difference between atmosphere and vacuum-packing methods was found. The volatile basic nitrogen(VBN) values at 1 day of storage were low, but they were increased as the storage period extended. The VBN values at 20 days after storage were from 12.25~19.28 mg %. Total bacterial counts tended to increase in all treatments, however, no significant difference was found in any treatment. Total plate counts of breast meat were higher than those of thigh meat as the storage period extended.

• 대한기계학회논문집A
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• 제32권2호
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• pp.186-193
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• 2008

[ $Moir{\acute{e}}$ ] interferometry is an optical method, providing whole field contour maps of in-plane displacements with high resolution. The demand for enhanced sensitivity in displacement measurements leads to the technique of microscopic $moir{\acute{e}}$ interferometry. The method is an extension of the $moir{\acute{e}}$ interferometry, and employs an optical microscope for the required spatial resolution. In this paper, the sensitivity of $moir{\acute{e}}$ interferometry is enhanced by an order of magnitude using an immersion interferometry and the optical/digital fringe multiplication(O/DFM) method. In fringe patterns, the contour interval represents the displacement of 52 nm per fringe order. In order to estimate the reliability and the applicability of the optical system implemented, the measurements of rigid body displacements of grating mold and the coefficient of thermal expansion(CTE) for an aluminium block are performed. The system developed is applied to the measurement of thermal deformation in a flip chip plastic ball grid array package.

• 한국식품조리과학회지
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• 제20권6호
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• pp.667-676
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• 2004

The purpose of this study was to estimate the microbial quality of some raw vegetables, and suggest a safer method for their sanitization and pre-preparation in foodservice operations. Baechu-geotjeori was monitored from the ingredient to the final product, during different holding temperature. Three sanitization methods were performed during the pre-preparation (tap water, chlorine water and electrolyzed water). The largest reduction in the microbial counts was shown with the electrolyzed water pre-preparation (after treatment; the total plate counts decreased to 3.34-4.06 Log CFU/g, coliform counts decreased to 1.40-1.45 CFU/g). Prior to immersion in the chlorine water, washing was first peformed to see if the was a larger effective reduction in the microbial counts.

• International Journal of Naval Architecture and Ocean Engineering
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• 제5권3호
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• pp.454-467
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• 2013

A practical Ship Inner Shell Optimization Method (SISOM), the purpose of which is to improve the safety of the seagoing transport ship by decreasing the maximum Still Water Bending Moment (SWBM) of the hull girder under all typical loading conditions, is presented in this paper. The objective of SISOM is to make the maximum SWBM minimum, and the section areas of the inner shell are taken as optimization variables. The main requirements of the ship performances, such as cargo hold capacity, propeller and rudder immersion, bridge visibility, damage stability and prevention of pollution etc., are taken as constraints. The penalty function method is used in SISOM to change the above nonlinear constraint problem into an unconstrained one, which is then solved by applying the steepest descent method. After optimization, the optimal section area distribution of the inner shell is obtained, and the shape of inner shell is adjusted according to the optimal section area. SISOM is applied to a product oil tanker and a bulk carrier, and the maximum SWBM of the two ships is significantly decreased by changing the shape of inner shell plate slightly. The two examples prove that SISOM is highly efficient and valuable to engineering practice.

• Corrosion Science and Technology
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• 제5권1호
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• pp.33-38
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• 2006

Current coating practice requires the thickness of anti-corrosion organic coatings to be over $250{\mu}m$ for immersion parts of ships and offshore structures and the corrosion resistance of these coatings has been evaluated by destructive and qualitative analysis. Recently, Electrochemical Impedance Spectroscopy(EIS) method has been employed, as an alternative, to evaluate corrosion resistance of organic coatings. This method is characterized as being nondestructive, reproducible, and quantitative in evaluating aging of organic coatings. In this study, EIS method was adopted to quantitatively and effectively select the coating systems having optimized protective performance. Evaluations of several epoxy and epoxy/polyurethane coating systems typically used for ships and offshore structures were carried out in wet($50^{\circ}C$, $90^{\circ}C$) and dry(room temp.) environments to accelerate the degradation of the organic coatings. These results were compared with the conventional scribed(scratched) test results. The plausible prediction model for determining the remaining life-time of coating systems was also proposed based on variations of impedance data, FT-IR and $T_g$ measurements results.

• Bulletin of the Korean Chemical Society
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• 제18권4호
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• pp.385-389
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• 1997

We report on the development of a new method to control the coverage of a metal film prepared with immersion method. An Sb species in solution adsorbed irreversibly at an open circuit potential (∼0.2 V) as an oxygenous Sb(Ⅲ) on a clean Au electrode, and the adsorbates showed voltammetric features in the potential range from 0.1 V to - 0.4 V. The full coverage of the Sb adsorbates was ∼0.45. On the contrary, the Sb species in solution did not adsorb at all on iodine-covered Au electrode surfaces, when the iodine coverages were more than 0.25. As the iodine coverage decreased below 0.25, however, the irreversible adsorption of Sb took place and the coverage of Sb increased accordingly. This electrochemical behavior has been interpreted as the penetration of the adsorbing Sb species in solution through open spaces among the iodine adlattices of coverages less than 0.25. With the manipulation of the iodine coverage, the controllable range of Sb coverage was from 0 to 0.45, i.e. the full coverage of Sb. In addition, the reversible deposition of Sb on an iodine-saturated Au electrode with voltammetric scan has been observed, which is contrasted with the adsorptive behavior of Sb on the clean Au electrode.