• 대한기계학회논문집A
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• 제41권4호
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• pp.307-312
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• 2017

레이저 클래딩은 아크 용접 및 용사와 같은 기존 클래딩 기술보다 우수한 장점을 가진다. 레이저 클래딩으로 형성한 클래드 층의 희석률은 낮으며 모재와의 결합력이 우수하고 결함이 거의 존재하지 않는다. 이러한 특징을 가진 레이저 클래딩을 실제 선박용 배기밸브에 적용하기에 위해 지난 제1보의 논문에서 조사한 공정변수에 따른 1 패스 클래드 층의 특성을 통해 넓은 면적에 클래딩 시 1 패스 클래드 층의 중첩이 필수적이라는 것을 알 수 있었다. 따라서 본 논문에서는 중첩률에 따른 멀티패스 클래드 층의 형상 차이를 비교하고 일정 중첩률 조건에서 EDS 및 EPMA를 통해 합금 성분 분포를 파악하였다. 실험결과, 중첩률이 증가할수록 클래드 층의 길이가 감소하고 높이가 증가하였으며 동일한 조건의 1 패스 클래드 층보다 높이가 상승하였다. 성분 분석을 통해 모재 희석이 많이 발생한 첫 번째 클래드 층에서 Fe이 높게 측정되었으나 나머지 영역에서는 희석이 감소하여 Co가 증가하고 Fe이 감소하였으며 균일한 성분 분포가 관찰되었다.

• 복식문화연구
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• 제6권4호
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• pp.62-73
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• 1998

This study focuses on semiotic significance of clothing, showed in visual mass media. This study will look into what general public understand from clothing and what influence clothing on visual mass media exert on fashion. This study employs an example, "Aein(sweetheart)", which was televised from 09/02/1996 till 10/23/1996. Some specialists(master′s degree or doctoral degree holders, or professors) of Clothing and Textile picked and analyzed scenes with specific clothing. The theoretical grounds of the analysis are 1) in what procession the significance operate from the view of mythological symbols by Bart, 2) what influences clothing on TV dramas exert on fashion. The outcomes of the study are followings: First, clothing′s signifying proces hs two dimensions; linguistic dimension and mythological dimension. Linguistic dimension which is regarded as general and unvariable and is related to the reproductive signifying operation, contributes to the creation of the characters including the characters′ social activities, professions, social or economic position. Mythological dimension which is related to the cultural and implicative signifying operation, played an important role in the development of the drama. Thus, it operates to create and deliver images including that atmosphere of he drama and the development of the story. Second, the TV media which is characterized with the form of centralized transmission and individual reception and the ability tro readily lead the fashion, has huge influence upon the fashion by properly creating mythological or linguistic dimension of the clothing in the drama, arousing the public′s sympathy, and stimulating the public′ immitation or conformity mentality.

• 한국해양학회지
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• 제21권1호
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• pp.34-45
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• 1986

한반도 동남해역(한국해협) 대륙붕의 표층 퇴적물의 입도 북석 자료에 대한 Q-Mode 요인 분석을 실시하였고, 그 결과는 해수면 변동에 따른 퇴적환경의 변화 를 시사하는 것으로 해석된다. 즉 외대륙붕과 붕단의 퇴적물은 분급이 양호한 사질 퇴적물이며 연근해성 패각을 많이 포함하고 있으므로 해수면이 낮았을 때 (약-150 m)집적된 잔유 퇴적물로 생각된다. 최대 수심 230m에 달하는 한국해곡(Korean Tro ugh)에 분포하는 퇴적물은 주로 원마도가 매우 양호한 역질 물질이며 이들은 해수 면이 상승하면서 재동작용을 받은 Palimpsest퇴적물로 해석된다. 수심 약 120m 이 내의 내 대륙붕에는 실트와 점토가 우세한 니질 퇴적물이 분포하며 이들은 해수면 이 거의 현 수준으로 상승한 지난 7000년 이후에 집적된 것으로서, 소위 내 대륙붕 니질대를 이루고 있다.

• 대한의용생체공학회:학술대회논문집
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• 대한의용생체공학회 1997년도 추계학술대회
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• pp.420-423
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• 1997

The oxygen saturation of blood can be measured by sensing the difference absorption in optical spectra of Hb and $HbO_2$, as the well known previous study. [1] In this study we developed the noninvasive tissue reflectance oximeter(TRO) using three kinds of LEDs which produce a peak spectral emission at a wavelength of 565, 660 and 940nm. And we tested the unction of the TR oximeter by comparing the output signals measured on normal tissue to measured on low oxygenated tissue. The results showed that oxygen saturation of blood and biological tissue can be monitored from the separation arrangement light source and detector.

• 한국환경과학회지
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• 제14권4호
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• pp.389-395
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• 2005

The changes of O-J-I-P transients were investigated using leaves of four subtropical plant species (Crinum asiaticum var. japonicum, Osmanthus insularis, Chloranthus glaber and Asplenium antiquum) under the natural conditions in winter, in order to select the stress indicators for diagnosing physiological states of plants under low temperature. In the O-J-I-P transients of these species, the fluorescence intensity was found to be higher in O-step and lower in P-step in winter than in summer. Particularly, the fluorescence intensity of the P-step in Crinum asiaticum var. japonicum was lower than those of other three plant species, indicating that Crinum asiaticum var. japonicum is the most sensitive to low temperature. Of the chlorophyll fluorescence parameters derived from O-J-I-P transients of four subtropical plants, Fm, Fv/Fo, ABS/CS, TRo/CS, $\phi_{po}$ and $\phi_{po}/(1-\phi_{po})$ decreased significantly with the increase of Fo, Sm, N, EToICS, ETo/RC and $\psi_o/(1-\psi_o)$ depending on temperature drop in winter. Therefore, these parameters could be used as indicators for estimating low temperature stress and diagnosing physiological states of plants under the natural conditions in winter.

• 한국게임학회 논문지
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• 제21권6호
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• pp.63-74
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• 2021

메타버스는 스마트폰을 상시 휴대하는 MZ세대의 생활 패턴과 자신의 정체성을 중요시하는 성향에 잘 맞는 가상공간이다. 이 연구는 한국의 전통문화 예술인 민화를 메타버스 플랫폼인 제페토에서 미술관으로 개발하는 기획 모델을 제안한다. 이를 위해 메타버스 플랫폼의 특징인 오픈월드, 샌드박스, 크리에이터 이코노미, 아바타에 대해 분석하고, 이를 제페토에 민화 미술관을 개장하는 기획 아이템으로 발전시킨다. 한국 전통예술을 현대적으로 재해석하면서, MZ세대의 뉴트로 감성에 맞는 메타버스 기획 개발 모델로서의 연구 가치가 있다.

• 한국환경과학회지
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• 제18권12호
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• pp.1361-1368
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• 2009

The effects of $Cd^{2+}$ ions on the Chl a fluorescence of 5 hydrophytes (e.g. Lemna, Salvinia, Ricciocarp, Nymph, Typha plants) were investigated in order to select $Cd^{2+}$-sensitive plant species and to get informations on physiological responses of plants to $Cd^{2+}$ stress. Lemna plants were most sensitive to cadmium stress, while Nymph plants were tolerant. However, in all $Cd^{2+}$-treated plants, Fv/Fm, the maximum photochemical efficiency of PS II, decreased in proportion to the increase of $Cd^{2+}$ concentration and treatment time. The Chl a fluorescence transient O-J-I-P was also considerably affected by $Cd^{2+}$ ions; the fluorescence yield decreased consid- erably in steps J, I and P in $Cd^{2+}$ treated plants, although it followed a typical polyphasic rise in non-treated plants. In Lemna plants, the functional parameters, ABS/CS, TRo/CS와 ETo/CS and RC/CS, decreased in proportion to the increase of $Cd^{2+}$ concentration, while N, Mo and Kn increased. The structural parameters, ${\Phi}po$, ${\Phi}po$/($1-{\Phi}po$), Plabs, SFlabs, Kp and RC/ABS, also decreased according to the increase of $Cd^{2+}$ concentration. Consequently, Lemna plants will be useful as a experimental model system to investigate responses of plants. And several functional or structural parameters could be applied to determine quantitatively the physiological states of plants under stresses.

• 한국환경과학회지
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• 제22권6호
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• pp.705-715
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• 2013

The response of the freshwater microalga Chlorella vulgaris to mercuric ion ($Hg^{2+}$) stress was examined using chlorophyll a fluorescence image analysis and O-J-I-P analysis as a way to monitor the toxic effects of mercury on water ecosystems. The levels of photosynthetic pigments, such as chlorophyll a and b and carotenoids, decreased with increasing $Hg^{2+}$ concentration. The maximum photochemical efficiency of photosystem II(Fv/Fm) changed remarkably with increasing $Hg^{2+}$ concentration and treatment time. In particular, above $200{\mu}M\;Hg^{2+}$, considerable mercury toxicity was seen within 2 h. The chlorophyll a fluorescence transient O-J-I-P was also remarkably affected by $Hg^{2+}$; the fluorescence emission decreased considerably in steps J, I, and P with an increase in $Hg^{2+}$ concentration when treated for 4 h. Subsequently, the JIP-test parameters (Fm, Fv/Fo, RC/CS, TRo/CS, ETo/CS, ${\Phi}_{PO}$, ${\Psi}_O$ and ${\Phi}_{EO}$) decreased with increasing $Hg^{2+}$ concentration, while N, Sm, ABS/RC, DIo/RC and DIo/CS increased. Therefore, a useful biomarker for investigating mercury stress in water ecosystems, and the parameters Fm, ${\Phi}_{PO}$, ${\Psi}_O$, and RC/CS can be used to monitor the environmental stress in water ecosystems quantitatively.

• 한국한의학연구원논문집
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• 제2권1호
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• pp.84-103
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• 1996

The physiological signals measured by Oriental Medicine instruments have been analyzed quantitatively in the view of the rule of promoting and counteracting relation of five evolutive phases theory. We tried to reduce the physiological signals measured by EAV(Elec-tro-Acupuncture according to Voll) and IR thermography to the representation of five evelutive phases. The EAV index and local skin temperature on acupuncture points of each phases measured and normalized so that the total value of five phases became unity. We assumed that the normalized EAV index and local skin temperature mean the deficiency or excess of Qi for each phases. The state of Qi distribution for each phases were approximately agree with the diagnostic pattern of O. M. doctor. Taking account of the Qi distribution state of·or the five evolutive phases, we performed a proper needle insertion on acupuncture points to induce the distinct change of Qi for each phases. We compared the measured results with the predictions of Qi variation by the rule of pro- moting and counteracting relation over the five evolutive phases. For all cases, the variation of Qi in the own phase on which a needle insertion was performed were exactly same to the theoretical prediction and partial agreement was shown for the other four phases. The same analysis was carried to the results of skin temperature measurements at accupoints. We found that the local skin temperature at accupoints of each phases shelved a finite change by the needle insertion and the behavior- of its change were strongly correlated to the rule of promoting and counteracting relation of five evolutive phases.

• 한국약용작물학회지
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• 제22권1호
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• pp.38-45
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• 2014

This study was performed to investigate the physiological responses of Oplopanax elatus by water condition. Drought stress was induced by withholding water for 26 days. The results show that $P_{N\;max}$, SPAD, gs, E and Ci were significantly decreased with decreasing of soil moisture contents. However, AQY and WUE were decreased slightly only at 26 day. This implies that photosynthetic rate is reduced due to an inability to regulate water and $CO_2$ exchange through the stomatal. According to JIP analysis, ${\Phi}_{PO}$, ${\Psi}_O$, ${\Phi}_{EO}$ and $PI_{ABS}$ were dramatically decreased at 21 day and 26 day, which reflects the relative reduction state of the photosystem II. On the other hand, the relative activities per reaction center such as ABS/RC, TRo/RC were significantly increased at 26 day. Particularly, Dio/RC and DIo/CS increased substantially under drought stress, indicating that excessive energy was consumed by heat dissipation. These results of chlorophyll a fluorescence show that the sensitivity changes photosystem II activity. Thus, according to the results, O. elatus was exhibited a strong reduction of photosynthetic activity to approximately 10% soil moisture contents, and JIP parameters could be useful indicator to monitor the physiological states of O. elatus under drought stress.