• 한국음향학회지
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• 제24권6호
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• pp.303-308
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• 2005

본 연구에서는 해상 실험 자료를 사용해 저주파 광대역 음원으로서 전구 음원의 음향학적 특성을 연구하였다. 본 연구를 위해 연속 전구 신호 획득이 가능한 전구 음원을 사용하였다. 본 논문에서는 전구 음원 특성 분석 결과를 나타내었으며, 이전 연구 논문과 비교하였다 연구 결과 전구 신호는 수심이 증가함에 따라 최고 음원 준위와 주 공진 주파수가 증가하는 것을 알 수 있었다. 또한 전구 음원을 사용한 지음향 파라미터 역산 연구와 정합음원 추적 연구를 통해 전구 음원에 의해 획득된 지음향 파라미터가 수중 음원 위치 추적에서 사용 가능함을 확인하였다.

• 조명전기설비학회논문지
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• 제29권5호
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• pp.26-33
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• 2015

Secondary optical system designed for LED bulb which emits light in all directions was simulated with Energy Star standards. Components of the optical system were LED light source, the cover of the LED bulb and reflector which is to confirm the diffuser plate and LightTools software was used to design the illumination optics. The main points of the secondary optical system design are the location of the LED light source, the shape of the LED bulb cover, the location of the reflection plate, and the scattering properties of the diffusing plate. Mechanism of the LED bulb is that the light emitted from the light source move on to the backward after reflected by the coated light cover from the inside and then the reflected light is scattered by the diffuser plate. The LED bulb was designed to satisfy the standard light distribution and color specifications of the Energy Star(IES LM-79-08).

• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 1999년도 춘계학술대회 논문집
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• pp.688-691
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• 1999

Light was of electric lamp was reflected by bulb reflector. In order to improve the efficiency of the electric lamp. it is inevitable that lamp, it is inevitable that improve the reflectance of bulb reflector. Important factors that affect the reflectance of bulb reflector is working pressure, distance between evaporation source to substrate, the situation of surface of glass. etch rate of glass, etc. In this paper. confirmed the effect of etching, working pressure etc. , and its effect for the reflectance of bulb reflector. Especially, concentration of HF in the etching solution and etching time is to be importnace for characteristic of bulb reflector.

• 한국균학회지
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• 제48권3호
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• pp.251-271
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• 2020

Diversity and community composition of bulb-associated fungi of Fritillaria Cirrhosae Bulbus source plants, which are used in traditional chinese medicine, in the eastern Himalaya-Hengduan Mountains, southwestern China, were estimated based on the internal transcribed spacer rDNA sequence analysis, using host plant species, geographic area, and plant phenology as variables. A total of 1,486 fungal sequences assigned to 251 operational taxonomical units (OTUs) were obtained from the bulbs. Fungal OTUs comprised 96.41% Ascomycotina, 3.52% Basidiomycotina, and 0.07% Zygomycotina. Sordariomycetes, Hypocreales, and Nectriaceae were the most frequent fungal lineages at each taxonomic rank. Fusarium, Ilyonectria, Tetracladium, Leptodontidium, and Tomentella were the top OTU-rich genera. Fusarium sp. 03, Ilyonectria rufa, Fusarium sp. 08, Ilyonectria sp. 03, and Leptodontidium orchidicola 03 represented the most frequent OTUs. Fusarium spp. were the most frequent general taxa. The distribution of fungal community exhibited preferences for host plant species, geographic area, and plant phenology. These findings are the foundation of our research on culturing and active metabolites of bulb-associated fungi of Fritillaria Cirrhosae Bulbus source plants.

• 한국약용작물학회지
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• 제20권2호
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• pp.101-107
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• 2012

Effects of nitrogen (N), phosphorous (P) and potassium (K) on the shoot and bulb growth of wild garlic ($Allium$ $victorialis$ var. $platyphyllum$) were studied by adopting $in$ $vitro$ culture. These macronutrients influenced the growth of both the shoot and bulb of garlic depending upon their application doses. A minimum of 3% potassium nitrate ($KNO_3$) as a source of nitrogen was found to be critical for shoot elongation while higher concentrations were inhibitory. Garlic bulb growth was profuse on the usual $KNO_3$ strength and sucrose (7%), followed by $KNO_3$ (9.4 mM) supplement. On providing 41.22 mM ammonium nitrate ($NH_4NO_3$) as nitrogen source highest shoot growth was observed while 82.45 mM $NH_4NO_3$ as a source of nitrogen supported high bulb growth. With regard to potassium a good shoot growth was observed in medium that contained 0.31 mM $KH_2PO_4$ and 3% sucrose, while bulb growth was high on 2.5 mM $KH_2PO_4$ and 7% sucrose. These experiments may thus direct the development of excellent growth conditions for the commercial production of edible wild garlic.

• 한국음향학회지
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• 제24권6호
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• pp.334-342
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• 2005

본 논문에서는 지난 2004년 동해에서 수행된 MAPLE 04 실험에서 수집된 일련의 전구음원 신호 중 일부를 이용하여 시간 영역에서 지음향 인자 역산을 수행하였다. 이를 위해 수직선배열을 통해 수집된 채널 별 신호 파형과 모의 신호 파형을 직접 비교하는 형태의 목적함수를 구성하였다. 모의 신호는 음선 이론을 사용하여 모델링하였고, 광역최적화 알고리즘인 VFSA (very fast simulated annealing)를 사용하여 목적함수를 최적화하였다 기존의 전달손실비교를 통한 역산 결과(음향학회지 본 호 게재)들과 비교하여 지음향 인자들이 일관성 있게 추정되었음을 확인하였으며, 이 역산 결과를 이용하여 얻은 모의 신호와 계측 신호 간 비교 그림을 제시하였다.

• Parasites, Hosts and Diseases
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• 제43권2호
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• pp.57-60
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• 2005

As gastroduodenoscopy performed more frequently, case reports of human echinostomiasis are increasing in Korea. A Korean woman presented at a local clinic with complaints of abdominal pain and discomfort that had persisted for 2 weeks. Under gastroduodenoscopy, two motile flukes were found attached on the duodenal bulb, and retrieved with endoscopic forceps. She had history of eating raw frog meat. The two flukes were identified as Echinostoma hortense by egg morphology, 27 collar spines with 4 end-group spines, and surface ultrastructural characters. This report may prove frogs to be a source of human echinostome infections.

• 한국조명전기설비학회지:조명전기설비
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• 제1권2호
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• pp.26-30
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• 1987

• 한국초등과학교육학회지:초등과학교육
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• 제25권1호
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• pp.70-88
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• 2006

The purpose of this study is to investigate the effect of a multiple cognitive conflict strategy at remedying student's misconceptions. Elementary students have many misconceptions about the brightness of the electric bulb in simple dual circuits. Most of the misconceptions can be summed up as 'the more batteries or the fewer bulbs, the brighter is the output.' The students have learned about the brightness of the electric bulb while connected to a battery in Grade 4 and the brightness of multiple electric bulbs in Grade 5. However, about $50%$ of the students remain with the firm misconception that the brightness of the bulb is related to the number of source batteries. This strong misconception may not lead to a conceptual change in the case of only one cognitive conflict. This study used a multiple conflict strategy while tackling the cognitive conflicts in the students as they solved the problems many times. It involved 160 grade 5 students. The result was they often changed their misconceptions and used more scientific thinking than the same grade students of other schools. It remains to be seen if this success will transfer to other schools and students and we intend on studying further the differences in students regarding this learning process.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2004년도 Asia Display / IMID 04
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• pp.855-859
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• 2004

The Japanese National Project "Carbon Nanotube FED" is developing a high image-quality and low power-consumption field emission display (FED) by applying carbon nanotube (CNT) to the electron source. A uniform electron source with a flat-film CNTs and fine structure triodes Fir suppressing the deviation of emission is required. For realizing an FED panel, it is also necessary to develop the glass-bulb technologies for vacuum sealing, and display technologies for driving the panel by circuit electronic and for evaluating the picture quality by measuring. By achieving these technologies, an FED compatible with conventional Cathode Ray Tubes (CRTs) will be realized.