• 디지털융복합연구
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• 제18권5호
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• pp.205-220
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• 2020

본 연구는 오랜기간 동안 연구돼 온 현실공간에서의 과시소비행동과 이미지 및 영상 기반의 SNS인 인스타그램에서의 과시소비행동 간에 차이를 비교하여, 변화된 과시소비에 대한 시사점을 제공하고자 수행되었다. 인스타그램을 적극적으로 이용하는 만 20세~59세의 218명을 대상으로 온라인 설문조사를 실시하여, 기술통계분석, 로지스틱회귀분석, 선형회귀분석을 통해 분석하였다. 그 결과 인스타그램에서의 과시소비행동과 현실공간에서의 과시소비행동의 소비품목, 지출액 그리고 행동에 미치는 영향요인에는 일부 차이가 있는 것으로 나타났다. 과시소비행동 이후, 인스타그램에서든 현실공간에서든 소비자들은 긍정적 감정이 소비자행복에 정적으로 유의한 영향을 미치고 있었다. 현실공간에 국한되어 있던 과시소비행동을 인스타그램이라는 새로운 환경적 요소를 반영하여 그 변화를 탐구한 점과 과시소비행동이 소비자 감정 및 행복에 미치는 영향을 살펴보았다는 점에서 본 연구는 과시소비행동의 연구범위를 확대했다는 점에 의의가 있다.

• 한국의류산업학회지
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• 제19권4호
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• pp.515-522
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• 2017

The natural dyeing industry has been faced with increasing demands of constant needs for environmentally and body friendly clothing products among modern consumers. Natural dyeing has attracted attention as a next-generation technology in green textiles. Dyestuffs need to be diversified for technological development activation in order to meet the increasing demands for natural dyeing. This study extracted dyeing solutions from the leaves of the Rose of Sharon (the national flower of South Korea) and investigated its dyeing properties for the development of various natural dyestuffs. This study investigates the dyeability of silk fabrics with Rose of Sharon leaves extract. Optimal conditions for dyeing of silk fabrics with the extract of Rose of Sharon were $40^{\circ}C/80min$ and $90^{\circ}C/60min$ with 100% concentration. Looking at the results, it showed the best K/S value at pH3, Sn pre-mordanting and Fe post-mordanting. Color fastness to washing, dry cleaning, rubbing and perspiration was good at grade 4-5 or 4. However, light fastness was observed in grade 2. In aspect of functional property, it showed an excellent result of 90% deodorization rate. In addition, its proven functionalities (deodorant properties) will help to produce high value added environment-friendly products. Those findings demonstrate the possibilities of the Rose of Sharon as an environment-friendly dye.

• 한국콘텐츠학회논문지
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• 제20권2호
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• pp.561-571
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• 2020

빅데이터를 활용한 위치정보 서비스가 지속적으로 발전하고 있다. 네비게이션의 측면에서는 지도 API서비스부터 선박 항해정보에 이르기까지 서비스의 범위가 확대되었고, 시스템 응용정보로서는 각 위치에 대한 SNS와 블로그 검색 기록에까지 확장되고 있다. 특히 최근에는 위치기반 검색 및 광고, 무인 자동차, IoT(Internet of Things) 및 O2O (Online to Offline) 서비스 등 신규 산업으로 활용되고 있다. 본 연구에서는 사용자가 특정 경로를 이동할 때, 빅데이터를 활용하여 근처 상점에 대한 정보를 보다 효과적으로 수신할 수 있도록 하는 인터넷 서비스를 제안하였다. 또한 지역 상점은 이 시스템을 사용하여 저렴한 비용으로 효과적으로 홍보할 수 있도록 시스템을 설계하였다. 특히 실시간으로 웹 기반 정보를 분석하여 사용자에게 제공하는 상점 정보의 정확도를 높이고자 하였다. 이 시스템을 통해 시스템 이용자인 일반 사용자와 상점 업주는 보다 효과적으로 정보를 활용할 수 있게 될 것이다. 또한 시스템 관점에서, 다양한 웹서비스와 통합하여 신규 서비스를 창출하는 것에 활용할 수 있을 것이다.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2010년도 제39회 하계학술대회 초록집
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• pp.167-167
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• 2010

Indium tin oxide (ITO) has been widely used as transparent conductive oxides (TCOs) for transparent electrodes of various optoelectronic devices, such as liquid crystal displays (LCD) and organic light emitting diodes (OLED). However, indium has become increasingly expensive and rare because of its limited resources. In addition, ITO thin films have some problems for OLED and flexible displays, such as imperfect work function, chemical instability, and high deposition temperature. Therefore, multi-component TCO materials have been reported as anode materials. Among the various materials, IZTO thin films have been gained much attention as anode materials due to their high work function, good conductivity, high transparency and low deposition temperature. IZTO thin films with a thickness of 200nm were deposited on Corning glass substrate at different substrate temperature by pulsed DC magnetron sputtering with a sintered ceramic target of IZTO (In2O3 70 wt%, ZnO 15 wt%, SnO2 15 wt%). We investigated the electrical, optical, structural properties of IZTO thin films. As the substrate temperature is increased, the electrical properties of IZTO are improved. All IZTO thin films have good optical properties, which showed an average of transmittance over 80%. These IZTO thin films were used to fabricate organic light emitting diodes (OLEDs) as anode and the device performances studied. As a result, IZTO has utility value of TCO electrode although it reduced indium and we expect it is possible for the IZTO to apply to flexible display due to the low processing temperature.

• 한국응용약물학회:학술대회논문집
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• 한국응용약물학회 1993년도 제2회 신약개발 연구발표회 초록집
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• pp.71-71
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• 1993

Carboxylesterase is widely distributed in the tissues of vertebrates, insects, plants and mycobacteria. Among various tissues of animals and humans, the highest esterase activity with various substrates is found in the liver. Kidney has moderate carboxylesterase activity in the proximal tubules. Considerable esterase activity is also found in the small intestine epithet elial cells and serum of mammals. Besides these tissues, carboxylesterase has been found in the lung, testis, adipose tissue, nasal mucosa and even in the central nervous system. Hepatic microsomal carboxylesterase catalyzes the hydrolysis of a wide variety of endogenous and exogenous compounds such as carboxylester, thioester and aromatic amide. Since carboxylesterases are important for metabolic activation of prodrugs and detoxification of xenobiotics, differences in substrate specificity and immunological properties of this enzyme are important in connection with choosing a suitable laboratory animal for the evaluation of biotransformation and toxicity of drugs. On the other hand, liver, kidney, intestine and serum were found to contain multiple forms of carboxylesterases in animal species and humans. In fact, we have purified more than fifteen isoforms of carboxylesterases from microsomes of liver, kidney and intestinal mucosa of nine animal species and humans. and characteristics of these isoforms were compared each other in terms of their physical and immunochemical properties. On the other hand, we have reported that hepatic microsomal carboxylesterases are induced by many exogenous compounds such as phenobarbital, polycyclic aromatic hydrocarbons, Aroclor 1254, aminopyrine and clofibrate. Later, we showed that some isoforms of hepatic carboxylesterase were induced by glucocorticoids such as dexamethasone and 16 ${\alpha}$-carbonitrile, but other isoforms were rather inhibited by these compounds. These findings indicate that involvement of carboxylesterases in the metabolism and toxicity of drugs should be explained by the isoforms involved. Since 1991, we have carried out detailed research investigating the types of carboxylesterases involved in the metabolic activation of CPT-11, a derivative of camptothecin, to the active metabolite, SN-38. The results obtained strongly suggest that some isoforms of carboxylesterase of liver microsomes and intestinal mucosal membrane are exclusively involved in CPT-11 metabolism. In this symposium, the properties of carboxylesterase isoforms purified from liver, kidney and intestine of animal species and humans are outlined. In addition, metabolism of CPT-11, a novel antitumor agent, by carboxylesterases in relation to the effectiveness will also be discussed.

• 인터넷정보학회논문지
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• 제15권5호
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• pp.73-82
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• 2014

최근 SNS가 이슈가 되고 다양한 분야에서 이를 이용한 연구가 활발하게 진행되고 있다. 특히 SNS 상에서 생성되는 여러 소셜 데이터를 기반으로 사용자의 관심사를 찾아내고 추천해 주는 시스템에 대한 연구가 대두되고 있다. 사용자의 관심과 선호도는 단순히 사용자가 작성한 글에서만 나타나는 것이 아니라, 친구와의 관계와 작성한 내용기반으로 분류되는 카테고리를 이용하여 파악될 수 있다. 본 논문에서는 사용자의 사회적 관계와 사용자가 작성한 소셜 데이터의 카테고리를 이용하여 사용자의 선호도를 자동으로 추출하고, 이를 기반으로 추천하는 방법을 제안한다. 그리고 실험을 통해 제안한 기법의 유효성을 검증한다.

• 인터넷정보학회논문지
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• 제19권4호
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• pp.83-93
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• 2018

본 연구는 여성들의 SNS 이용이 대안 건강행동에 미치는 영향에 대해 분석해 보고자 했다. 특히 최근 많은 주목을 받았던 독성생리대와 대안생리대에 대한 SNS 정보추구가 대안생리대에 대한 이용의도에 미치는 영향에 주목했다. 이를 위해, 건강신념모델을 기반으로 가설을 설정했고, 총 11개의 가설을 온라인 설문을 통해 수집된 자료에 대한 경로분석을 통해 분석했다. 경로분석 결과를 살펴보면, SNS를 통해 수집된 독성생리대와 대안생리대에 대한 정보이용은 대안생리대에 대한 지각된 이익과 독성생리대에 대한 지각된 민감성에 유의미한 영향을 미치는 것으로 나타났다. 또한 자기효능감, 지각된 민감성, 지각된 이익, 그리고 지각된 장애는 대안생리대의 사용의도에 유의미한 영향을 미치는 것으로 나타났다.

• Journal of Pharmaceutical Investigation
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• 제40권6호
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• pp.353-356
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• 2010

Although liposomes have been applied as drug delivery systems in various fields, the usage was limited due to the low encapsulation efficiency compared to other carrier systems. Here, cationic liposomes were prepared by mixing 1,2-dioleoyl-3-trimethylammoniopropane (DOTAP) as a cationic lipid, 1,2-dioleoyl-sn-glycerol-phosphoethanolamine (DOPE) and cholesterol (CH), and the liposomes were hydrated by varying the aqueous phases such as phosphate-buffered saline (PBS), 5% dextrose, and 10% sucrose in order to improve the encapsulation efficiency of bovine serum albumin (BSA). The particle size and zeta potential were determined by dynamic light scattering method and in vitro release patterns were investigated by spectrophotometry. Particle size and zeta potential of liposomes were varied depending on the ratio of DOTAP/DOPE/CH in range of 270-350 nm and 0.8-9.7 mV, respectively. Moreover, the addition of polyethylene glycol (PEG) improved the encapsulation efficiency from 37% to 43% as well as reduced particle sizes of liposomes while the liposomes were hydrated in PBS. When the liposomes were hydrated with 10% sucrose, the encapsulation efficiency of BSA was higher than any other groups. Whereas PBS was used as hydration solution, lower encapsulation efficiency was obtained compared with other groups. More than 60% of BSA was released from the liposomes hydrated with 10% sucrose; thereafter another 20% of BSA was released. Therefore, release pattern of BSA from cationic liposomes was extended release in this study. From the results, cationic liposomes dispersed in 10% sucrose would be potential carrier with high encapsulation efficiency.

• 한국인터넷방송통신학회논문지
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• 제20권5호
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• pp.207-214
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• 2020

요즘 스마트폰, 각종 전자기기 등의 사용이 늘고, 인터넷과 SNS가 활성화되며 우리는 정보의 홍수 속에 살고 있다. 정보의 양이 기하급수적으로 증가하며 많은 정보를 다 살펴보는 것이 어려워졌고, 문서에서 핵심 키워드만 보기를 원하는 사람이 늘어나며 정보의 핵심이 되는 토픽을 추출하는 연구의 중요성이 증가하고 있다. 또한, 토픽을 추출하여 과거와 비교 분석하여 현재의 트렌드를 유추해내는 것도 최근 중요한 이슈이다. 토픽 모델링 기법을 이용하여 대량의 문서에서 토픽을 추출해낼 수 있으며, 이렇게 추출된 토픽은 트렌드 예측, 데이터 분석 등 다양한 분야에서 쓰일 수 있다. 본 논문에서는 빠르게 변하는 트렌드를 분석하여 시대의 흐름에 맞춰가기 위해 확률적 토픽 모델 기법의 하나인 LDA 알고리즘을 활용하였으며, 문서에서 컴퓨팅 분야의 2016, 2017, 2018년도 3개년 논문의 주제를 알아보고, 연구의 동향과 흐름을 분석한다.

• Bulletin of the Korean Chemical Society
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• 제32권1호
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• pp.59-64
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• 2011

Degree of unsaturation in fatty acid molecules plays an important role in the formation of vesicles. Vesicle formation from C18 fatty acids with different amount of double bonds such as oleic acid, linoleic acid and linolenic acid with the incorporation of 1,2-dipalmitoyl-sn-glycerol-3-phosphoethanolamine-N-[methoxy(polyethylene glycol)-2000] (DPPE-PEG2000) have been examined by TEM. Critical vesicular concentrations (CVC) of the vesicle suspension are determined by turbidity and surface tension methods. The CVC of fatty acids increases when the amount of unsaturation in the alkyl chain increases. On the other hand, stability of vesicle suspension has been examined by using particle size and zeta potential at $30^{\circ}C$. There was a dramatic decrease in particle size measurement from mono-unsaturation to tri-unsaturation which could be due to the effect of fluidity in the membrane bilayer caused by different degree of unsaturation. The values of zeta potential for vesicles that were formed without the incorporation of DPPE-PEG2000 were in the range of -70 mV to -100 mV. It has been observed that the incorporation of DPPEPEG2000 to the vesicle reduces the magnitude of zeta potential. However, this phenomenon does not obviously seen in fatty acid vesicles formed by linoleate-linoleic acid and linolenate-linolenic acid. We therefore conclude that the addition of DPPE-PEG2000 does not effectively improve the stability of the linoleate-linoleic acid and linolenatelinolenic acid vesicle at pH 9.0 after the evaluation of their particle size and zeta potential over a period of 30 days. Although the vesicles formed were not stable for more than 10 days, they have displayed the potential in encapsulating the active ingredients such as vitamin E and calcein. The results show that the loading efficiencies of vitamin E are of encouraging value.