• Proceedings of the Korean Society Of Semiconductor Equipment Technology
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• 2006.10a
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• pp.154-157
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• 2006

ITO(indium tin oxide)/glass 기판 위에 PEDOT:PSS[poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate)]와 PVK[poly(N-vinyl carbazole)] 고분자 물질을 정공 주입 및 수송층으로, 발광층으로 PFO-poss[Poly(9,9-dioctylfluorenyl-2,7-diyl) end capped with POSS]를 사용하여 스핀코팅법과 열 증착법으로 ITO/PEDOT:PSS/PVK/PFO-poss/LiF/Al 구조의 고분자 발광 다이오드를 제작하였다. PFO-poss 유기발광 층의 열처리 조건 (온도, 시간)이 PLED 소자의 전기적, 광학적 특성에 미치는 영향을 조사하였다. 1 wt%의 농도를 갖는 PFO-poss 유기물 발광 층을 200C 온도로 3시간 열처리 할 경우 11 V 인가전압에서 $1497\;cd/m^2$의 최대 휘도를 나타내었다. 동일온도에서 열처리 시간을 1시간에서 3시간으로 증가시킬 경우 휘도의 증가와 함께 발광 개시온도가 감소하는 경향을 보여주었다. 또한 열처리 온도와 시간을 증가시킬 경우 제2발광피크인 excimer 피크가 크게 나타났으며 청색에서 황색 발광 쪽으로 천이되는 경향을 나타내었다.

• Korean Journal of Poultry Science
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• v.33 no.2
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• pp.113-119
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• 2006

This study was carried out to investigate the effects of dietary Saccharomyces cerevisiae (wild yeast mutant) and Saccharomyces cerevisiae hFeHLC (ferritin containing yeast) and chelated Fe on growth performance and body composition of broiler chicks. A total of 252 (1-day old) 'Ross' broiler chicks were allotted to seven dietary treatments: I) control without iron supplementation, 2) 0.1% wild yeast mutant (YM03), 3) 1.0% wild yeast mutant, 4) 0.1% ferritin containing yeast (YF04), 5) 1.0% ferritin containing yeast, 6) 0.01% chelated Fe and 7) 0.1% chelated Fe. The highest weight gain obtained from broilers fed 0.01% chelated Fe was 2,121g, the lowest weight gain obtained from broilers fed control diet was 2.087g. The growth performance results were not significantly different in weight gain, feed intake and feed conversion ratio of broilers diets containing wild yeast, ferritin containing yeast and chelated Fe supplementation and control diets (P>0.05). The lowest iron content in meat was for control 30.51 mg/dL and the highest Fe content was for 0.1% ferritin containing yeast 41.58 mg/dL, but these were not significantly different (P>0.05).

• Journal of Yeungnam Medical Science
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• v.14 no.2
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• pp.314-328
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• 1997

A cross-sectional study was performed to evaluate the effects of chronic exposure to low-dose solvent on neurobehavioral performance of 48 male workers exposed to organic solvents. A control group of 50 workers was selected from same factories. Each worker completed a medical and occupational questionnaire and four tests of Neurobehavioral Core Test Battery. These included Benton visual retention test, digit symbol, digit span, and pursuit aiming. Comparison of mean performance showed a significantly poorer performance on digit symbol, digit span, and pursuit aiming. In univariate analysis, age contributed to poor performance on Benton visual retention test and educational level was found to reduce the performance on symbol digit in both groups. Amount of alcohol intake was found to reduce the performance on digit symbol and smoking appeared to slow pursuit aiming in the exposure group. In multiple regression analysis, controlling for age, educational level, alcohol, and smoking, Solvent exposure was found to be associated with performance of digit span, and number of correct dot of pursuit aiming. Age on Benton visual retention, educational level on digit symbol, arid smoking on pursuit aiming were found to be a significant factors on each test items. This study suggest that short-term memory, and perception can be affected easily by chronic exposure of organic solvents which air concentration levels were under the Threshold Limit Value.

• Proceedings of the Korea Air Pollution Research Association Conference
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• 2000.04a
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• pp.60-61
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• 2000

온도의 변화에 따라 계절이 뚜렷하게 구분되는 지역에서 VOC (volatile organic compound, 휘발성 유기화합물)의 계절적 농도는 겨울에 농도가 높고 여름에 낮은 거동을 나타낸다. 이러한 농도 경향에서는 단지 겉으로 나타나는 농도의 절대치로는 계절적 농도 거동에 영향을 주는 요인들을 파악하기 어렵다. 이 연구에서는 측정된 농도가 지니고 있는 계절적 특성을 유추하기 위한 간접적 방법으로 주요 성분들의 농도비를 이용하였다. (중략)

• Applied Biological Chemistry
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• v.46 no.2
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• pp.94-100
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• 2003

Preparation method and characteristics of high quality Korean pickled cucumber made with acetic acid-treated cuttle bone powder (KPCCP) were examined and compared to those of Korean pickled cucumber prepared by traditional methods (control). Optimal concentration of acetic acid-treated cuttle bone powder for KPCCP preparation was revealed as 10%. Salt concentration of KPCCP fermented for 3 days was 4.5%, slightly higher than that of the control, whereas that of KPCCP fermented for over 6 day was about 4.8%, similar to that of the control. The pH, greenness, and hardness of korean pickled cucumber decreased during fermentation, with the control showing a greater extent of decrease than KPCCP Total acidity and alcohol insoluble calcium contents increased during fermentation, with KPCCP showing higher extent of increase. These results indicate that quality of KPCCP is superior to that of Korean pickled cucumber prepared by traditional methods.

• Journal of the Korea Organic Resources Recycling Association
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• v.10 no.4
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• pp.81-85
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• 2002

This study was carried out to investigate the effect of organic fertilizer(OM-1 : $300kgha^{-1}$, OM-2 : $600kgha^{-1}$), microorganism(ML : liquid form, MP : powder form) and seaweed extract ; ascophyllum nodosum(AF : foliar application, AI ; irrigation) on the growth and yield of the chinese cabbage. At the treatment of organic fertilizer OM-2 have appeared the best yield. According to the application of microorganism appeared certainly increasing yield of cabbage by application of powder form. The excess application of organic fertilizer OM-2 should not be occurred fertilizer damages and increased on the growth and yield by use of microorganism, In application of sewweed extract treatment, the cabbage yield increased by irrigation method.

• Journal of the Korean GEO-environmental Society
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• v.15 no.12
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• pp.43-51
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• 2014

Organic matter in dredged soil has a lot of engineering problem in ground including a large settlement, crack propagation, low bearing capacity and low friction angle. From an agricultural point of view, however, organic matter contributes greatly soil quality and plant health. This paper investigated the relationship between engineering and germination characteristics of stabilized mixture consisting of different ratios of organic content (0 %, 10 %, 20 %, 30 %) for recycling dredged soil including organic matter. Several series of laboratory tests such as flow test, unconfined compressive test and consolidation test were performed to find out engineering characteristics. pH, percent of germination and growth of plants were also measured to investigate the germination characteristics. The experimental results indicated that, as organic content increased, unconfined compressive stress decreased and compression and swelling indices increased. However, percent of germination and plant growth increases as organic content increases.

• Clean Technology
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• v.20 no.2
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• pp.116-122
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• 2014

Various types of MOFs (metal-organic frameworks) were prepared via hydrothermal and post-grafting methods and applied as catalysts for the synthesis of jasminaldehyde, one of the representative perfume intermediates, by Aldol condensation of benzaldehyde with heptanal. Although both acid and base sites could catalyze the reaction, the catalytic performance was strongly dependent on the physical properties as well as the nature of functionalization on MOFs. While the use of sulfonated MOF catalysts led to decrease of jasminaldehyde selectivity regardless of MOFs used, the selectivity change was found to rely on the MOF types in the case of the amine-functionalization. Among the catalysts tested, MIL-101 shows the best catalytic performance, which may suggest that MIL-101 has suitable acid properties to promote the Aldol condensation and the large pore of MIL-101 is also advantageous to alleviate the diffusion problem of bulky products.

• Journal of the Korean Institute of Landscape Architecture
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• v.52 no.4
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• pp.18-31
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• 2024

This study examines the inscription trends and characteristics of 121 cultural landscapes inscribed on the UNESCO World Heritage List to gain a comprehensive understanding of their inherent values and attributes. By employing a dual methodology involving descriptive statistical analysis and in-depth case studies, this research investigates the geographical distribution, temporal inscription patterns, selection criteria, and typologies of these landscapes. The data for this study were collected from official documents and databases available on the UNESCO World Heritage Center website, ensuring the reliability and authenticity of the information. The analysis reveals that cultural landscapes are predominantly concentrated in Europe and Asia, with a steady increase in inscriptions since 1992. These landscapes are primarily recognized for their uniqueness in reflecting human-nature interactions, as well as the importance of traditional culture and land-use practices, resulting in their inscription mainly under criteria (iv), (iii), (v), and (ii). Furthermore, cultural landscapes can be broadly categorized into three types: designed landscapes, organically evolved landscapes, and associative landscapes. Among these, organically evolved landscapes, formed through long-term interactions between human activities such as agriculture and industry and the natural environment, constitute a significant proportion. These findings suggest that UNESCO World Heritage cultural landscapes possess a complex value system encompassing nature and culture, tangible and intangible elements, and material and non-material aspects. This necessitates a fundamental shift in the perception and preservation approaches to cultural heritage, requiring an integrated approach that emphasizes the overall context rather than individual elements and focuses on the dynamic process of landscape evolution itself. Moreover, cultural landscapes have the potential to contribute to sustainable development models by fostering regional identity, strengthening community resilience, and promoting sustainable economic growth. Therefore, the preservation and management of cultural landscapes require a perspective that holistically views the dynamic evolution process of the landscape and a governance system based on the active participation of local communities and stakeholders. This study contributes to enhancing the in-depth understanding of the characteristics and values of cultural landscapes and provides a foundation for the selection and management of future cultural landscape heritage sites.

• Journal of the East Asian Society of Dietary Life
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• v.13 no.4
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• pp.305-312
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• 2003

The effect of addition of ethanol and/or organic acid on slowing down the fermentation of Mul-kimchi was tested by measuring the changes in pH, acidity and counting the number of microorganisms in kimchi fermentation, and sensory evaluation were carried out. The addition of 0~5％ ethanol to kimchi delayed the decrease of pH and the delaying effect during kimchi fermentation was dependent on the ethanol concentration used. The pH of kimchi without ethanol decreased from 5.7 to 4.13, however, the pH of the kimchi added with 5％ ethanol only from 5.8 to 5.14. The increase of acidity in kimchi with 5％ ethanol was only 0.5~0.6％, while that without ethanol was 0.7~0.8％. Among the organic acids tested, adipic acid was found to be most effective on the prevention of kimchi souring. The Mul-kimchi added 2％ ethanol together with 0.1％ organic acid showed similar effect to that of organic acid alone in the change of pH and acidity. By the sensory evaluation, Mul-kimchi with 0.1％ adipic acid and 2％ ethanol was selected the most desirable one except control without any addition. And the numbers of total microbes, lactic bacteria and yeast count, showed the most effective inhibition in Mul-kimchi with 0.1％ adipic acid and 2％ ethanol.