• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.175.2-175.2
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• 2011

바이오디젤의 국가별 의무 사용 정책 확대로 인해 원료유 가격이 상승하고 있으며 원료유가 부족한 상황으로 다양한 원료를 찾는 연구가 진행되고 있다. 육상 유지 작물보다 단위면적당 생산성이 매우 높은 미세조류는 제3세대 바이오매스로 주목받고 있으며 산업체 배출 이산화탄소를 이용해 작은 면적에서 배양할 수 있는 장점이 있다. 미세조류로부터 바이오디젤 생산은 먼저 오일 함량이 높은 미세조류 종의 선정과 배양 및 수확 후 효율적인 방법으로 바이오디젤 원료유를 추출하는 과정이 중요하다. 본 연구는 Microwave로 전처리된 미세조류로 부터 원료유를 추출하여, 인지질, 단백질, 엽록소 등의 반응저해 물질을 일부 감소시키고 추출수율을 높였지만, 산가가 80이상으로 높게 추출되고 추출된 오일이 높은 점성을 가지는 문제가 있다. 이로 인해 전이에스테르화 반응의 진행이 불가하였으며 이러한 문제를 해결하기 위해, 에스테르화 반응에 용매를 혼합하여 반응성을 개선하고자 하였다. 추가된 보조 용매는 오일과 쉽게 혼합되어 반응물의 점성을 낮추고, 반응 완료후, 물에 쉽게 용해되는 불순물, 미 반응물, 촉매 등의 분리 및 제거를 용이하게 하는 장점이 있다. 또한 오일과 비교하여 낮은 끓는점을 갖는 용매는 증류를 통해 쉽게 제거가 가능하다. 반응이 완료된 오일은 초기산가 80에서 10이하의 감소를 나타내 용매 혼합 에스테르화의 효율적인 부분을 확인하였다.

• Journal of Medicine and Life Science
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• v.15 no.2
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• pp.56-61
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• 2018

Advances in medical technology has enabled better management of complicated and chronic wounds. Negative-pressure wound therapy (NPWT) is a novel dressing technique that uses negative pressure to drain exudates and blood from wounds. NPWT increases local blood flow and promotes reduction of edema and wound healing and is suitable for a variety of wounds. It is associated with few adverse effects and shows excellent efficacy and cost-effectiveness. NPWT promotes rapid growth of granulation tissue and wound contraction; thus, it is more advantageous than general dressings as it reduces the size skin of grafts or flaps required for repair, and patients with chronic wounds can be treated as outpatients. We investigated the general usage and mechanism of NPWT, its clinical applications and adverse effects.

• Journal of Korean Society of Water and Wastewater
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• v.38 no.2
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• pp.109-117
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• 2024

In this study, various pre-treatment methods were evaluated for microalgae separation. These methods aimed to facilitate safe, rapid, and cost-effective online imaging for real-time observation and cell counting. As pre-treatment techniques, heating, chemical hydrolysis, heating combined with chemical hydrolysis, and sonication were employed. The effectiveness of these methods was evaluated in the context of online imaging quality through experimentation on cultivated microalgae (Chlorella vulgaris and Scenedesmus quadricauda). The chemical treatment method was found to be inappropriate for improving image acquisition. The heating pre-treatment method exhibited a drawback of prolonged cell dispersion time. Additionally, the heating combined with chemical hydrolysis method was confirmed to have the lowest dispersion effect for Chlorella vulgaris. Conversely, ultrasonication emerged as a promising technique for microalgae separation in terms of repeatability and reproducibility. This study suggests the potential for selecting optimal pre-treatment methods to effectively operate real-time online monitoring devices, paving the way for future research and applications in microalgae cultivation and imaging.

• (The)Study of the Eastern Classic
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• no.35
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• pp.297-327
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• 2009

Kant proposed three principles of moral philosophy(Categorical Imperative) and Supreme moral principle in The Fundamental principles of Metaphysics of Ethics : Act only on that maxim through which you can at the same time will that it should become a universal law ${\cdots}$ etc. Kant's three principles of moral philosophy(Categorical Imperatives) imply that the idea of universality, freedom, and the kingdom of ends. We contrast Chu Hsi's Moral Philosophy with Kant's three principles of Categorical Imperatives. In conclusion Chu Hsi's moral rules be equal to kantian categorical imperative. These rules implicate principle of universalization, impartiality, and the kingdom of ends. But Chu Hsi believe in reality of the human mind and it's nature. Human mind and it's nature is comprised of benevolence, righteousness, propriety and wisdom. Benevolence, righteousness, propriety and wisdom(四德) is the origin of morality. Chu Hsi's philosophy of LI(理) is metaphysics of Tao-Te(道德) or ontological-metaphysical Ethics. Everyone has created with LI. LI is potentiality of Human beings and the good. Chu Hsi's moral philosophy is distinguished from the traditional theory of the substance and modern scientism(phenomenalism)

• Journal of Life Science
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• v.28 no.8
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• pp.955-961
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• 2018

Although much research has focused on various bioactive substances in starfish, research on microorganisms isolated from starfish is lacking as compared with other natural products. In this study, we investigated bacterial communities in the gut of red starfish (Certonardoa semiregularis) in Jeju Island. In total, 103 bacterial strains were isolated using marine agar and R2A medium. The isolated strains were analyzed and identified using the 16S rRNA gene sequence. Based on an analysis of this gene sequence, the 103 isolated bacteria were classified into four major groups: Proteobacteria (93%: Alpha-proteobacteria, 24.8%; Beta-proteobacteria, 4%; Gammaproteobacteria, 65%) Bacteroidetes (4%), Actinobacteria (2%), and Firmicutes (1%). In addition, the isolates were divided into seven classes (Actinobacteria, Flavobacteria, Bacilli, Sphingobacteria, Alphaproteobacteria, Betaproteobacteria, and Gammaproteobacteria), 15 orders, 19 families, and 24 genera. A phylogenetic analysis revealed two strains, Lysobacter sp. and Pedobacter sp., with similarity of 97.55% and 97.58%, respectively. As the similarity in the 16S rRNA gene sequence was 98% or less compared to previously identified bacteria, the two strains may possibly be classified as a new genus or species. We suggest that additional studies, including biochemical and morphological tests, should be performed to identify the new candidate strains.

• Journal of the Korean Society of Fisheries and Ocean Technology
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• v.33 no.3
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• pp.166-172
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• 1997

In order to exterminate effectively starfish, Asterias amurensis inhabited a village fishing grounds and shellfish farms on coast of Korea, Mop and sledge gear were made and sea trials for capture efficiency of starfish by each gear and towing distance were carried out by commercial dredger on the coast of Keojedo from April to May in 1995. As Starfish mop and sledge were slowly dragged over the bottom at the same time, starfish became entangled in bunches of twine and netting respectively. The gears were hauled up at intervals to remove the starfish and hand-picking operations on vessel were conducted. The results obtained are as follows : Two gears were smoothly slidden over the sea bottom and captured numerous starfish. The optimal towing distance by each gear was 300 to 500 m.The capture efficiency of starfish species by sledge was 57% compared with 43% of that by mop but mixed rate with fish or shellfish of the former was 21 times as high as that of the letter. It was concluded from sea trials that moping was effective in shellfish farms, because the mop outfit causes little damage to useful shellfishes and the mixture of starfish with fish or shellfish was low, whereas sledging can be used to clean uncultivated areas free of shellfish where starfish population is very heavy and common fishing grounds in which bottom material is rock or gravel.

• The Journal of Korean Philosophical History
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• no.43
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• pp.267-293
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• 2014

This paper is aimed at analyzing the characteristics of Image-Meaning theory focused on image in the early days of the Joseon Dynasty and SongMing period. Zhouyi' theory in the early days of the Joseon Dynasty was constructed on the basis of Zhouyi' theory of SongMing period. The characteristics of Image-Meaning theory in the early days of the Joseon Dynasty can be explained largely by two routes. One is the perspective of critical succession on Zhouyi'theory of focusing on meaning that led Chengyi(程?) and Yangwanli(楊萬裏). As the representative of this route, Gwongeun and Toegye not only asserted Image-meaning theory focused on meaning, but also developed a perspective of taking all the image and meaning. The other is the active succession and creative transformation about Image-Meaning theory of Tushuxue that led Chentuan(陳?) and Shaoyong(邵雍). As the representative of that route, Yulgok and Yeohun explained the schematic diagram of the universe of the universe by using methodology of Tushuxue. Furthermore, they actively succeed Shaoyong' Zhouyi theory to expand Image-Meaning theory focused on number. In addition, Cho, Haoyi(曺好益)described the propositions - "meaning is not out of image area, image equipped with meaning all, then there is no law of limitation in image adopted theory. Those propositions are opposed to Chengyi(程?) and Zhuxi(朱熹)' ZhouYi' theory.

• Journal of Digital Convergence
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• v.13 no.10
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• pp.509-516
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• 2015

Intangibility, measurement difficulty and irreversibility, which are the characteristics of service, have such problems as obscurity and uncertainty in quality evaluation. Technical entrepreneurship education, a sort of public service, also contains such characteristics of service. To objectively evaluate the service quality of technical entrepreneurship education, this paper drew up factors as hierarchical structure, centered on FAHP technique, and conducted pre-processing, inputted those factors into triangular fuzzy number fuzzy judgement matrix, and calculated their weights. In this manner, this paper proposed a TESE system, through which an analysis can be conducted by drawing relative importance and priorities of the factors. The proposed system can efficiently evaluate the qualitative technical start-up education service quality factors quantitatively in the diversely changing technical start-up environment in view of the highest result quality (41%), which means performance in the relative importance of major factors. Namely, this paper confirmed that clear decision making can be made through an experiment.

• Proceedings of the Korean Institute Of Construction Engineering and Management
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• 2006.11a
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• pp.435-439
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• 2006

The purposes of study is to propose a new method contract price adjustment in construction projects. The research method of this study includes a case analysis and questionnaire survey. The results of this study are as follows: 1) For improvement method of contract amount adjustment, enactment for legislation pertaining to computation methods such as military's organization through total unit cost, and price flexibility computation at the point of design modification were presented. 2) Arithmetic formulas for cases in which volume is deleted or modified below the price flexibility exemption amount or in which there is no change to quantity, at the occurrence of design modification resulting from price flexibility, were proposed.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.17 no.4
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• pp.922-934
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• 2013

The Amur Starfishes, known as give huge damages to shellfish farms, are being removed by only divers and fish net in the wide areas. Therefore, increasing recognition rates of starfishes are desperately required to remove high amounts of Amur Starfishes effectively. Meanwhile, current technology of obtaining the images of starfish distribution has limitation of obtaining color images due to using visible light in the darkness seabed area. In this research, we have used infrared ray, which is very penetrated, and strong against noise that comes from floating objects under the water, in order to solve current problems. As a result, we have acquired better images to analyze recognition rates of starfishes, and also able to received much satisfied recognition rate results for 88.7% of Amur Starfishes by adopting the most suitable adaptive filter method.