• Proceedings of the KIPE Conference
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• 전력전자학회 2006년도 전력전자학술대회 논문집
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• pp.104-106
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• 2006

LCD 원판이 세대별로 대형, 중량화됨에 따라 제조 공정라인의 자동 반송장비도 대형화 되어 가고 있는 추세다. 기존 스토커는 주행축에 회전형 모터와 기계적 동력변환 장치를 사용하고 있어, 복잡한 구조와 기계적 마찰에 의한 잦은 유지, 보수가 필요하게 되고 파티클 발생을 최소화 시켜야 하는 문제점을 안고 있다. 따라서 이런 문제점들을 해결하기 위해, 본 논문에서는 횡자속 선형전동기를 적용하고 제안된 제어 알고리즘 및 제어기, 전력변환장치를 제작해서 대형, 고출력, 장거리화 되고 있는 스토커의 주행축에 실험, 검증하였다.

• Proceedings of the KSAR Conference
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• 한국동물번식학회 2001년도 춘계학술발표대회
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• pp.83-83
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• 2001

본 연구는 이유한 경산돈의 발정동기화방법이 번식성적에 미치는 영향을 조사하기 위하여 대조구(자연발정), T1(Regumate＋PMSG＋hCG), T2(PMSG＋hCG) 및 T3(PG600)처리구로 발정을 유기한 후 12시간 간격으로 2회 인공수정 하여 수태율, 분만율 및 산자수를 조사하였다. 본 실험에 사용된 액상정액은 축산기술연구소 돼지인공수정센타의 종모돈 5두 정액을 혼합하여 이용하였으며, BTS(Beltsville thawing solution) 보존액으로 1회 주입 정자농도를 3.0$\times$$10^{9}$이 되도록 조절하였다. 수태율은 72구가 95.2%, 73처리구가 93.6%로 발정동기화 유도하지 않는 대조구의 91.3%보다 다소 높은 수태율을 나타내었으나 통계적인 유의차는 없었으며, T1 동기화 방법이 87.2%로 가장 낮은 수태율을 나타내었다(P<0.05). 분만율은 T2처리구가 90.4%로 가장 높았으며(P<0.05), T3구는 수태율은 높았으나 분만율이 가장 낮게 조사된 것은 임신 확인 후 각종 사고로 인한 조기 도태 매각 때문인 것으로 분석되었다. 복당 평균 총산자수는 대조구에 비하여 발정 동기화유도 처리구 모두 증가하였으나 통계적인 유의차는 인정되지 않았다.

• Korean Journal of Environmental Agriculture
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• 제16권3호
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• pp.249-254
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• 1997

The constructed wetland system which is applicable to rural wastewater treatment was examined by pilot plant experiment. Removal rates of nutrients including nitrogen and phosphorus and total coliform were evaluated. The $NH_4\;^+$ concentration of the influent was in the range of 91.57 to 275.88mg/l and the effluent concentration was about 40% lower than the influent. The decreasing of the $NH_4\;^+$ concentration might be due to volatilization, plant uptake, adsorption onto soil particles, and mainly nitrification. However, generally concentrations of $NO_2\;^-$ and $NO_3\;^-$ were increased in the effluents compared to the influent concentrations, which implies that nitrogen components in the system were nitrified. Overall, the average removal rate of the nitrogen was about 5% which seems inadequate as a wastewater treatment system, and this system needs improvement on nitrogen removal mechamism. The removal rate of the phosphorus was quite high and effluent concentration was very low. Reason for high removal rate of the phosphorus might be mainly strong adsorption characteristic onto soil particles. The average removal rate of the total coliforms was about 83%, and main removal mechanisms are thought to be adsorption onto soil and inability to compete against the established soil microflora. From the results of the study, the constructed wetland system needs to be improved in nitrogen removal mechanism for field application.

• Proceedings of the Materials Research Society of Korea Conference
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• 한국재료학회 2003년도 추계학술발표강연 및 논문개요집
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• pp.188-188
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• 2003

본 연구에서는 Pd에 의한 MILC(Metal induced lateral crystallization)시 수소 플라즈마 처리의 영향에 따른 결정화 양상 및 TFT에 미치는 효과에 대해 고찰하였다. 현재까지 Pd에 의한 MILC에 의해 Channel이 제작된 TFT는 Transfer curve 특성을 보이지 않는것으로 보고되어 있다. 이는 바늘 모양의 성장으로 인해 결정질 부분이 다 채워지지 않고 비정질 부분이 존재하고, 결정질 내에 쌍정 결함이 존재하기 때문인 것으로 알려져 있다. 본 실험에서는 수소 플라즈마 처리 시 Pd에 의한 MILC 양상이 수소 플라즈마 처리를 하지 않은 경우와는 달리 측면 결정화 양상이 바늘 모양의 성장 모습을 보이지 않고, 결정질 부분이 다 채워진 평탄한 모양의 성장 모습을 보였다.

• Journal of Korea Foundry Society
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• 제23권5호
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• pp.286-290
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• 2003

본 연구에서는 Ni-Zr-Ti의 3원계 합금을 기본으로 하여, Si 및 Sn 등의 원소를 첨가하여 Ni-rich 영역에서 벌크 비정질 합금을 제조하였다. $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ 조성의 합금에서 injection casting에 의하여 약 58 K의 과냉각액상영역을 가지고 있는 직경 3 mm의 벌크 비정질 시편을 제조하였다. 이러한 우수한 비정질 형성능은 액상온도의 저하로 인해 낮은 온도까지 액상이 쉽게 과냉되기 때문인 것으로 사료된다. $Ni_{59}Zr_{20}Ti_{16}Si_5$ 합금은 두 단계에 걸쳐 결정화가 일어나는 반면, $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ 합금은 단일 단계에 의해 orthorhombic $Ni_{10}{(Zr,Ti)}_7$ 결정상과 cubic NiTi 결정상으로 결정화가 일어난다. 벌크 비정질 $Ni_{59}Zr_{20}Ti_{16}Si_2Sn_3$ 합금의 경우 압충강도는 2.7 GPa, 연신율은 약 2% 정도의 값을 가진다.

• Journal of the Korean Institute of Traditional Landscape Architecture
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• 제40권2호
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• pp.24-33
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• 2022

The travel notes and nature poems found in historic literary men's works can be considered historical records related to scenic sites. Such travel notes and nature poems are based on the writers' personal characters, experiences, learning and etc. Such works clearly show the characters of each literature, information of the related objects and the writers' thoughts of the objects. This study, thus, looked into Euisang on Xīsāishān Mountain that could be the origin of Eobusa(漁父詞) loved and sung by Korean historic literary men, and found that the Korean and Chinese literary men's thoughts were shown through their ways to enjoy Xīsāishān Mountain and their Euisang on the mountain, which was different between the Korean and Chinese literary men depending on the geographical locations described in their poems. In detail, the study results are: 1. Such difference of the ways to enjoy Xīsāishān Mountain, the scenic site described in historic Korean and Chinese literary men's work is broadly classified into the ways to enjoy the scenic site by seeing it in person and the ways to enjoy it under the mental structure of speculation. 2. Xīsāishān Mountain in Wuxing is the background of Yújiāzi(漁家子) of the painting Zhāngzhìhé, is boasting its distinguished beautiful nature, and is the place where the Confucian Study of Hú(湖學) was originated. It is also the place known of its warmhearted climate. Therefore, Euisang on Xīsāishān Mountain under such beautiful and warmhearted circumstance are realized as the complete freedom and seclusion in Taoism and the satisfaction with the given environment and position in Confucianism. 3. Xīsāishān Mountain in Wǔchāng is a military strategic point with rugged mountain terrain and scenery that has been a historic ferocious battlefield and related with the loyal civil servant Qū Yuán. The Euisang on Xīsāishān Mountain in Wǔchāng, therefore, represents the nature scenery of a rugged fortress and patriotism of Confucianism. 4. The Korean literary men's way to enjoy Xīsāishān Mountain is Shinyu(神遊: spiritual travel), so that their Euisang is formed according to the direction of the writer's values. Especially it is noted that Korean Euisang on Xīsāishān Mountain is originally based on the painting Zhāngzhìhé that shows the complete free mood of Taoism; and the Euisang on Xīsāishān Mountain that came from the mindful image by the poet monk Qíjǐ of Tang dynasty and Kim Si-seup appears with such Buddhist ways to seek the truth as SakGongIlYeo(色空一如: Being full is essentially as same as being vacant) and GyeonSeongSeongBul(見性成佛: Everybody can become Buddha by enlightenment).

• Korean Journal of Remote Sensing
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• 제30권6호
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• pp.703-708
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• 2014

$NO_2$ vertical profiles were retrieved via ground based MAX-DOAS measurements for the summer period in 2006 in Beijing, one of the megacities in the Northeast Asia. Large portion of $NO_2$ load was observed at the 0-1 km layer. We found that $NO_2$ rapidly decreases up to the altitude of 3 km. In addition, the retrieved $NO_2$ mixing ratios within 0-1 km layer were compared with those observed at the surface by in-situ monitor. The correlation coefficient (R) between $NO_2$mixing ratios within 0-1 km layer and those at the surface was calculated to be 0.7. The major causes of such discrepancy are thought to be both differences in measured areas and rapid decrease in $NO_2$ mixing ratio with height.

• Polymer(Korea)
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• 제34권4호
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• pp.326-332
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• 2010

Nanocomposite films were prepared by blending poly(amic acid)(PAA), poly(o-hydroxyamide)( PHA) and organically modified montmorillonite (OMMT) that has a layered structure. XRD, SEM and TEM were used to study the morphology of PAA/PHA nanocomposites, and DMA, TGA, UTM, LOI and PCFC techniques were used to characterize the mechanical and thermal properties, and flame retardancy of the nanocomposites. TEM images revealed that OMMT layers were well dispersed in the PAA/PHA matrix and showed exfoliation and intercalation behavior. The addition of 3 wt% OMMT to the PAA/PHA blend increased the initial modulus of PAA/ PHA blend to 3.68 GPa that was ca. 48% higher than that of the control PAA/PHA blend. Above 4 wt%, however, both the initial modulus and the tensile strength were found to decrease, which might be due to the aggregation of OMMT in PAA/PHA matrix. When the OMMT content was below 3 wt%, the thermal stability and flame retardancy of the PAA/PHA nanocomposites increased with increasing OMMT content.

• Applied Chemistry for Engineering
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• 제21권6호
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• pp.697-701
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• 2010

We investigate the cell performance and characteristics of a direct formic acid fuel cell (DFAFC) using palladium (Pd) as a catalyst for anode. Pd is deposited on the electrolyte using the "direct paint" method. From a continuous three time-test of the polarization curve of the DFAFC, it is found that the catalytic activity of Pd and the cell performance of DFAFC steadily degrade as the tests are proceeded. This behavior may be due to the deactivation of Pd by formate (COOH) and hydroxyl (OH) groups, which are electrochemically dissociated from formic acid solution. Estimations of the degradation, followed by reactivation in activity of Pd catalyst and DFAFC cell performance are implemented by linear voltage sweep tests going in both positive and negative directions. When the maximum voltage of 1.0 V versus DHE is applied to the cell while a linear voltage sweep test going in negative directions, the activity of Pd catalyst and the DFAFC cell performance recover by the rehabilitation in activity of the deactivated Pd.

• (The)Study of the Eastern Classic
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• 제62호
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• pp.263-289
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• 2016

Confucius, whose life coincided with the Warring States period of China, is one of the most respected sages in world history whose teachings and life produced countless disciples in China, Korea, and Japan. There are innumerable pictures, sculptures, and other artworks that portray memorable deeds of Confucius and interesting anecdotes that involve his pupils. One of the most popular subjects for these Confucian portrayals is the anecdote in which Confucius and his pupil, Zhi Ru, discover a tilting vessel at an ancestral shrine in the Lu dynasty and use it to understand the doctrine of the mean. The vessel becomes the basis for the famous Chinese expression, "the cautionary vessel beside one's seat," which is nowadays used to denote one's motto for life. Portraits of these tilting vessels can be divided between those showing the vessels only and others that show Confucius observing the vessels. The former serve as visual reminders, for rulers and policy makers, of the doctrine of the mean that is necessary to fair and righteous governance. The latter form part of the pictorial biography of Confucius with educational content and messages. Interestingly, portraits of Confucius observing or studying tilting vessels have been famous among members of the royal court and the literati, circulated either as single artworks or included in the folding screens of human portraits. Portrayals of other Confucian anecdotes are mostly found in albums that visualize the genealogy of the Way; in contrast, the portraits of Confucius and the tilting vessels were included in folding screens that were popular among the literati that enjoyed stylish works of art and antiques. The portraits of tilting vessels thus highlight the diverse functions and symbolic value of human portraits. This study classifies the portraits of tilting vessels into various forms, and analyzes the period-and objective-dependent changes and characteristics in these portraits. With its exploration of the diverse functions and aspects of portraits of Confucian anecdotes, this study will shed new light on how ancient artists reanimated the lives of great sages and how these artworks differ in their expressions and styles.