• Proceedings of the Korean Vacuum Society Conference
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• 2010.02a
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• pp.62-62
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• 2010

근래 실리콘 나노선을 이용한 FET타입의 바이오 센서로의 응용 연구가 활발하다. 본 연구에서는 top-down 방식으로 제작한 실리콘 나노선의 전자수송 특성을 측정 분석하여 실리콘 나노선의 기하학적 변수에 따른 수송 변수를 추출하였다. 두께가 40 nm인 SOI wafer로부터 출발하여 일반적인 포토리소그라피와 건식식각 공정을 통하여 선폭이 100-300 nm 그리고 길이가 2-20 mm인 실리콘 나노선을 제작하고 resistance 및 transconductance를 측정하여 전하농도와 이동도의 선폭에 대한 의존도를 얻었다. 이를 바탕으로 bare surface, OH-activated surface, APTES-treated surface등 실리콘 표면상태에 따른 표면전하의 시간에 대한 진화과정을 모니터 할 수 있었으며, 또한 PBS 용액상태에서 pH를 변화시킴에 따른 전하수송 특성곡선의 변화를 연구하였다.

• Korean Journal of Weed Science
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• v.31 no.4
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• pp.410-415
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• 2011

• Current Research on Agriculture and Life Sciences
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• v.7
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• pp.1-10
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• 1989

This experiment was conducted at the Kyungpook National University Agriculture college farm during 1988 to determine the effect of tiller no. Per hill on growth and competitive response of the rice plant. The results obtained were summarized as follows : As tiller no. Per hill, Rice yield increased and also yield component such as 1000-grain weight and ripening ratio were increased up to at 10 tiller no. Per hill but they decreased at 13 tiller no. Per hill in used four rice varieties. Culm length of four rice varieties was shortest at one tiller no. Per hill however as tiller no. Per hill increased culm length significantly decreased in all rice varieties. Flag leaf length was highest at one tiller no. Per hill in all varieties while flag leaf length decreased with increased tiller no. Per hill. Highest harvest index exhibited at 13 tiller no. Per hill in all varieties and also showed that Chil seongbyeo and Samgang byeo of Tongil variety were higher harvest index compared to Nagdongbyeo and Palgongbyeo of Japonica Variety. Tiller no. Per hill did not significantly affect the heading date except by delayed heading date on Chilseong and Samgangbyeo at one tiller no. Per hill. The correlation coefficients of competitive index and ripening ratio and harvest index were 0.60 and 0.77 respectively while panicle length was 0.43 and grain weight was 029.

• Korean Journal of Ecology and Environment
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• v.46 no.2
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• pp.192-204
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• 2013

Fish community structure and inhabit status of endangered fish species were investigated during April to November 2011 in Baebong Stream, Gangwon do, Korea. The number of fish species inhabiting the upper section (Stations 1~3, 5) was 14 and the stream bottoms were mostly composed of cobbles and boulders (Aa-type). Meanwhile, the number of fish species inhabiting the lower section (Stations 4, 6, 7) was 26 and the stream bottoms were mostly composed of pebbles, cobles and sand (Bb-type). A total of 26 species belonging to ten families were found in the stream during the survey period. The dominant and subdominant species were Rhynchocypris steindachneri (31.1%) and Squalidus multimaculatus (13.3%), respectively, and others such as Pungitius kaibarae (11.0%), Zacco koreanus (7.8%), Misgurnus anguillicaudatus (7.0%), Iksookimia pacifica (5.5%) and Z. platypus (5.3%) were followed in the order. Four species of Squalidus multimaculatus, Z. koreanus, I. pacifica and Liobagrus andersoni were endemic to Korea. And, Lethenteron japonica, L. reissneri, Pungitius sinensis and Cottus hangiongensis were endangered fish species in this stream. Oncorhynchus keta, L. japonica and Tribolodon hakonensis were anadromous species, and Plecoglossus altivelis was an amphidromous species. The similarity index based on species composition and abundance clearly divided the fish community structure of the Baebong Stream into two sections fragmented by a weir installed into the stream. It is necessary to install a fish ways on the weirs for a fish migration and movements.

• Korean Journal of Organic Agriculture
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• v.17 no.2
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• pp.227-236
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• 2009

This research was carried out to investigate the seasonal occurrence of major pests and the effects of releases of natural enemies for biological control of the major pests in eggplant greenhouse. A total of 8 pest species in 7 families were identified. Among these pests, Myzus persicae, Aphis gossypii, Frankliniella occidentalis, Tetranychus urticae and Trialeurodes vaporariorum were the dominant species in eggplant greenhouse. Two aphid species occurred mainly from May to June, but their populations decreased rapidly from July. The population density of F. occidentalis was high from June to July and T. urticae and T. vaporariorum were abundant from July to September during the growing season of eggplant. In the trials of biological control of pests, aphids could be suppressed within the range of $87{\sim}97%$ by two times releases of Chrysopa pallens eggs. F. occidentalis and T. urticae could be suppressed within the range of $76{\sim}90\;and\;87{\sim}91%$ by three times releases of Orius sauteri adults, respectively. The releases of C. pallens eggs and O. sauteri adults were as effective as three times applications of insecticides for the control of aphids, F occidentalis and T. urticae from May to September.

• KOREAN JOURNAL OF CROP SCIENCE
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• v.39 no.3
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• pp.237-244
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• 1994

To elucidate the physiological characteristics of 2 japonica type and 2 tongil type of rice cultivars, photosynthesis, respiration and diurnal changes of photosynthesis rate had been investigated 6 times at each growing stage. The ratios of photosynthetic part of tongil types were higher than those of japonica types at tillering stage. The highest photosynthetic activity was measured on August 1, before heading in each growing stage, and efficiency of photosynthesis showed its the highest on July 25. Diurnal photosynthetic curve at heading stage reached the peak at 11-12 AM, but after 2 weeks from heading stage, the peak apperred at 1-2 PM. Conversion of respiration into photosynthesis for $CO_2$ fixation started 30~60 minutes later than the standard sunrise time and reconversion for carborhdrate accmulation began 50~60 minutes earlier than the standard sunset time. Photosynthesis showed positive correlation with chlorophyll content and root activity. Harvest index of tongil type cultivars were significantly higher than those of japonica type cultivars.

• Computational Structural Engineering
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• v.2 no.1
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• pp.65-70
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• 1989

An analytical study was conducted using the Galerkin technique to determine behaviour of thin fibrereinforced and laminated composite pipes under soil pressure. Geometric nonlinearity and material linearity have been assumed. It is assumed that vertical and lateral soil pressure are proportional to the depth and lateral displacement of the pipe respectively. It is also assumed that radial shear stress is negligible because the ratio of thickness to the radius of pipe is very small. The above results are verified by the finite element analysis.

• Journal of Life Science
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• v.34 no.6
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• pp.385-392
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• 2024

Hot pepper (Capsicum annuum L.) is a valuable plant that is widely used worldwide for food and medicinal purposes. This study compared ethanol extracts of five native Korean varieties (Yuwol-cho, Subi-cho, Sumihyang, Gounbit, and Chilseong-cho) and five improved varieties (Dabok, Cheongyang, Chungseong, Olbokhap, and Shin-honggildong) of peppers cultured in Korea. The extracts were analyzed for color difference, polyphenol content, and their antioxidant, antidiabetic, and antithrombotic activities. The extracts of the improved varieties exhibited higher levels of redness and lower levels of yellowness compared to the native varieties. Polyphenol and flavonoid content analysis revealed significantly higher levels in the Yuwol-cho and Sumihyang varieties, which also exhibited scavenging activities in 1,1-diphenyl-2-picryl hydrazyl anion-, 2,2-azobis(3-ethylbenzothiazoline-6-sulfonate) cation-radical scavenging, and reducing power assay. The Chilseong-cho, Yuwol-cho, and Dabok varieties showed significantly higher nitrite scavenging activity. Antidiabetic activity based on α-glucosidase inhibition was observed in the Subi-cho, Sumihyang, and Gounbit extracts. Evaluation of antithrombotic activity showed that the Yuwol-cho extract prolonged thrombin time by 1.61 times compared to the solvent control at a concentration of 5 mg/ml, while the Dabok extract prolonged prothrombin time and activated partial thromboplastin time by 1.33 times and 2.21 times, respectively. All pepper extracts showed no erythrocyte hemolysis activity up to a concentration of 5 mg/ml. Our results suggest that native Korean peppers have the potential to serve as valuable sources of antioxidant, antidiabetic, and antithrombotic agents. This research also indicates the possibility of replacing improved pepper varieties, which incur significant seed usage fees, with native Korean pepper varieties.

• Maxillofacial Plastic and Reconstructive Surgery
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• v.11 no.1
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• pp.221-225
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• 1989

Arthrography is one of highly accurate diagnostic tools for internal derangements of the temporomandibular joint (TMJ). Both TM joints are connected by the mandible and one may have influence upon the other. We performed bilateral TMJ arthrograms in 42 patients with TMJ disorders to evaluate the bilaterality of internal derangements of the TMJ. The results were as follows : 1. We could not find any specificity in clinical symptoms according to each state of internal derangements of the TMJ. 2. The bilaterality of internal derangements of the TMJ was 61%. 3. Statistically, significant correlation was found in the aspects of the presence of arthrographic abnormality in both TMJ and each state of internal derangements in them. Therefore, the patients, who are diagnosed as any internal derangement of the TMJ, need to have assured examination in the contralateral joint.

• Journal of the Korean Vacuum Society
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• v.10 no.2
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• pp.225-233
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• 2001

Distortion of Secondary Ion Mass Spectrometry(SIMS) depth profile, which is usually observed when the analysis is made using oxygen flooding on the surface of Si with oxide on it, has been corrected. The origin of distortion has been attributed to depth calibration error due to sputter rate difference and concentration calibration error due to relative sensitivity factor(RSF) difference between $SiO_2$ and Si layers, In order to correct depth calibration error, artifact in analysis of sodium ion on oxide was used to define the interface in SIMS depth profile and oxide thickness was measured with SEM and XPS. The differences of sputter rate and RSF between two layers have been attributed to volume swelling of Si substrate occurred by oxygen flooding induced oxidation. The corrected SIMS depth profiles showed almost the same results with those obtained without oxygen flooding.