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The Impact of an Ontological Knowledge Representation on Information Retrieval: An Evaluation Study of OCLC's FRBR-Based FictionFinder (정보검색에 온톨로지 지식 표현이 미치는 영향에 대한 연구: OCLC의 FRBR기반 FictionFinder의 평가를 중심으로)

  • Cho, Myung-Dae
    • Journal of the Korean Society for information Management
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    • v.25 no.2
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    • pp.183-198
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    • 2008
  • With the purpose of enriching existing catalogues with FRBR, which is the Functional Requirements for Bibliographic Records, in mind, this paper aims to evaluate the impact of bibliographic ontology on the overall system's performance in the field of literature. In doing this, OCLC's FictionFinder(http://fictionfinder.oclc.org) was selected and qualitatively evaluated. In this study 40 university seniors evaluated the following three aspects using the 'transferring thoughts onto paper method': 1) In which ways is this FRBR-aware bibliographical ontology helpful? 2) Are the things which are initially attempted to be helped being helped? 3) Would users seeking one work in particular also see all other related works? In conclusion, this study revealed that, as Cutter claimed in his $2^{nd}$ rule of the library, collocations give added-value to the users and overall ontology provides better interface and usefulness. It also revealed that a system's evaluation with qualitative methodology helped to build full pictures of the system and to grip the information needs of the users when the system is developed. Qualitative evaluations, therefore, could be used as indicators for the evaluation of any information retrieval systems.

Cell Fusion of Cellulolytic Fungi, Aspergillus sp. HB1 (섬유소 분해균 Aspergillus sp. HB 1의 세포융합에 관한 연구)

  • Kim, Joo-Ho;Chang, Sung-Yeoul;Choi, Yong-Keel
    • The Korean Journal of Mycology
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    • v.15 no.2
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    • pp.80-86
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    • 1987
  • The author isolated high cellulolytic fungi from natural sources and determined optimal condition of protoplast formation and fusion as fundamental step for improvement of the isolated it's cellulolytic ability. Three different cellulolytic fungi, such as Aspergillus sp., Penicillium sp. and Trichoderma sp., were isolated from soil. Their cellulolytic activities were compared with that of Aspergillus niger which was useful industrially and had cellulase activity. It was Aspergillus sp. that showed the highest activity of all these four fungi. And then it was followed by Penicillium sp., Trichoderma sp., and Aspergillus niger in order. An auxotrophic mutant of Aspergillus sp. was obtained by UV mutagenesis method. Having try to produce protoplast from mycelia, the author found that ${\beta}-glucuronidase$, at pH 6.0, was effective cell-wall lytic enzyme. And the optimal concentration of this enzyme was 5,000 unit/ml. Regeneration rates of wild type, met. auxotroph and arg. auxotroph, in presence of osmotic stabilizer, were 7. 0%, 7. 5% and 5.2%, respectively. PEG with M.W. 6,000 was effective stimulator for protoplast fusion in the concentration of 30% (W IV). In such a condition, we obtained 1.2% cell fusion rate.

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Study on the Spin Valve Giant Magnetoresistance With a New Mn-Ir-Pt Antife rromagnetic Material (Mn-Ir-Pt 새로운 반강자성체를 사용한 스핀밸브 거대자기저항에 관한 연구)

  • 서수정;윤성용;김장현;전동민;김윤식;이두현
    • Journal of the Korean Magnetics Society
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    • v.11 no.4
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    • pp.141-145
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    • 2001
  • The Mn$\_$80/Ir$\_$18.1/Pt$\_$1.9/ exchange bias layers (EBLs), which have a small amounts of Pt, exhibit a high value of H$\_$ex/. The Si/Ni-Fe/Mn$\_$80/Ir$\_$18.1/Pt$\_$1.9/ EBL shows the largest H$\_$ex/ of 187 Oe, which is equivalent to a exchange energy (J$\_$ex/) of 0.146 erg/cm$^2$. Mn$\_$80/Ir$\_$18.1/Pt$\_$1.9/ EBLS are estimated to have blocking temperature of about 250 $\^{C}$, which is higher than those of Mn-Ir EBLs and Mn-Ir-Pt EBLs with higher Pt contents. This result implies that a little addition of Pt element promotes thermal stability in the Mn-Ir-Pt EBLs. The chemical stability of Mn-Ir-Pt EBLs was characterized by potentiodynamic test, which was performed in 0.001 M NaCl solution. The current density of Mn-Ir-Pt films was gradually reduced with increasing Pt content. The present results indicate that the Mn-Ir-Pt with a small amount of Pt is suitable for an antiferromagnetic material for a reliable spin valve giant magnetoresistance device.

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Superparamagnetic Properties of γ-Fe2O3 Nanoparticles (초미세 나노분말 γ-Fe2O3의 초상자성 특성연구)

  • Lee, Seung-Wha;Lee, Jae-Gwang;Chae, Kwang-Pyo;An, Sung-Yong
    • Journal of the Korean Magnetics Society
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    • v.20 no.5
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    • pp.196-200
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    • 2010
  • $\gamma-Fe_2O_3$ nanoparticles have been prepared by a sol-gel method. The structural and magnetic properties have been investigated by XRD, VSM and Mossbauer spectroscopy. $\gamma-Fe_2O_3$ powder annealed at $150^{\circ}C$ has a spinel structure and superparamagnetical behavior. The estimated size of superparammagnetic $\gamma-Fe_2O_3$ nanoparticle is around 7 nm. The hyperfine fields at $-261^{\circ}C$ for the A and B patterns were found to be 503 and 485 kOe, respectively. The blocking temperature ($T_B$) of superparammagnetic $\gamma-Fe_2O_3$ nanoparticle is about $-183^{\circ}C$. The magnetic anisotropy constant of $\gamma-Fe_2O_3$ nanoparticle was calculated to be $1.6{\times}10^6ergs/cm^3$. $\gamma-Fe_2O_3$ nanoparticle annealed at $150^{\circ}C$ can be a candidate for biomedicine applications as magnetic carriers.

Das strategische Verstehen der Werbeanzeige (광고텍스트의 전략적 이해)

  • Oh Jang-Geun
    • Koreanishche Zeitschrift fur Deutsche Sprachwissenschaft
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    • v.1
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    • pp.287-311
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    • 1999
  • Das $verst\"{a}rkte$ Interesse der Sprachwissenschaft, sich mit expositorischen Gegenwartstexten zu befassen, fuhrte in den 60er Jahren zu einer intensiven Betrachtung lingualer Erscheinungen der Werbesprache. $Zun\"{a}chst$ widmete man sich der exemplarischen Erforschung lexikalischer, syntaktischer und stilistischer Erscheinungen, die als charakteristisch $f\"{u}r\;\"{o}konomisch$ oder ideologisch $gepr\"{a}gte\;Anpreisung\;eingesch\"{a}tzt$ wurden. Eine weitere Intention bestand darin, die Korrelation zwischen Werbe­sprache und Standardsprache zu definieren. Bald erkannte man, $da\ss$ eine werbliche Aussage nicht allein durch sprachliche, sondern auch durch visuelle und auditive $Ausdrucksmodalit\"{a}ten\;gepr\"{a}gt$ wurde. Die Erforschung dieser extralingualen Zeichensysteme ist bis heute nicht soweit ausgereift, $da\ss\;global\;g\"{u}ltige$ Aussagen gemacht werden $k\"{o}nnen$, denn eme umfassende Darstellung des visuellen Vokabulars fehlt. Neben den formal-gestalterischen Aspekten untersuchte man, welche Inhalte auf welche Weise vermittelt wurden und welchen psychologischen Effekt sie evozierten. Parallel dazu existierte die Intention, die vielschichtigen $\"{o}konomischen$, gesellschaftlichen und politischen Bedingungen werblicher Kommunikation zu ergrtinden. In diesem Beitrag wurde davon ausgegangen, $da\ss$ Werbeanzeigen unter Verstehensaspekten systematisch untersucht werden sollen, wenn der Kommunikatonszweck der Werbeanzeigen darin besteht, den Text­rezipienten (den potentiellen Konsumenten) sie sich leicht $einpr\"{a}gen$ zu lassen und eine Kaufentscheidung $\"{u}ber$ das entsprechende Produkt $auszul\"{o}sen$. Dabei gelten Werbeanzeigen als multimediale Texte, in denen verbale und nonverbale Zeichen sich gegenseitig $erg\"{a}nzen$ und wechselseitig determinieren $k\"{o}nnen$. In der vorliegenden Arbeit werden also das Zusammenwirken der verschiedenen Sinnsteuerungsfaktoren, die im $Verstehensproze\ss$ der Werbeanzeigen aktiviert werden $k\"{o}nnen$ und ihre Relevanzwerte zum Erfassen des Textsinns thematisiert. $Daf\"{u}r$ wird die Textsorte 'Werbeanzeige' $Zun\"{a}chst$ als Untersuchungsgegenstand definiert und eindeutig von anderen Textsorten abgegrenzt. Daran $schlie{\ss}en\;sich\;die\;Erkl\"{a}rung$ und die Kritik des strategischen Verarbei­tungsmodells von van Dijk/Kintsch an. Nach der Kritik des Strategiemodells von van Dijk/Kintsch wurde die Werbeanzeige 'Whisky-Chivas Regal' zur empirischen $Begr\"{u}ndung$ des strategischen Verstehensansatzes $ausgew\"{a}hlt$ und analysiert. Aus der funktional-strategischen Verstehensanalyse der Werbeanzeige 'Whisky­Chivas Regal' $l\"{a}{\ss}t\;sich\;folgern,\;da\ss$ neben der schematischen Strategie vier verschiedene Verarbeitungsstrategien, $n\"{a}mlich$ syntaktische, semantische, nonverbale und sozio-kulturelle Strategien, hier eingesetzt werden sollen, um das $vollst\"{a}ndige$ Verstehen der Werbeanzeige 'Whisky-Chivas Regal' zu erreichen. Ohnehin besteht ein Untersuchungsziel der vorliegenden Arbeit darin, die bisher meines Erachtens nicht intensiv und engagiert genug $gef\"{u}hrte$ Diskussion $\"{u}ber$ die hier behandelten verstehenstheoretischen Fragestellungen und ihren Anwendungen anzuregen. Falls sich diese $\"{U}berlegungen$ zu weit von dem, was man gemeinhin unter, Textverstehen' versteht, entfernen, und deshalb dazu beitragen $k\ddpt{o}nnten,\;konkrete\;Einw\"{a}nde\;und\;Gegenvorschl\"{a}ge$ zu provozieren, die durch eine fruchtbare Auseinandersetzung zu einem breiten Konsens $\"{u}ber$ eine Verstehenstheorie $f\"{u}hren,\;h\"{a}tte$ damit diese Untersuchung einen guten Dienst geleistet.

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Improving wettability of polyethylene(PE) surface by ion assisted reaction (이온보조반응법에 의한 Polyethylene(PE) 표면의 친수성 증가)

  • 석진우;최성창;장홍규;정형진;최원국;고석근
    • Journal of the Korean Vacuum Society
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    • v.6 no.3
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    • pp.200-205
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    • 1997
  • Surface of polyethylene film was modified by ion assisted reaction in which ion beam is irradiated on polymer in reactive gas environments. Ion (argon and oxygen) beam energy was 1 keV, doses were varied from $1{\times}10^{14}$ to $1{\times}10^{17}$ inons/ $\textrm{cm}^2$, and amount of blowing oxygen from 0 to 4 sccm(ml/min). Wettability was measured by water contact angle measurement, and the surface functionality was analyzed by x-ray photoelectron spectroscopy. The contact angles of water to polyethylene modified by oxygen ion beam only decrease from 95 to degrees, and surface energy was not changed much. The contact angles remarkably decrease to 28 degrees and surface energy increase to 67 erg/ $\textrm{cm}^2$ when the films were modified by argon ion with various ion doses with blowing oxygen gases near the polyethylene surface. Improvement of wettability and surface energy are mainly due to the new functional group formation such as C-O or C=O, which are known as hydrophilic groups from the XPS analysis, and the assisted reaction is very effective to attach oxygen atoms to form functional groups on C-C bond chains of polyethylene.

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Effect of EGR on power and exhaust emissions in diesel engine (디젤엔진의 출력 및 배기가스에 미치는 EGR의 영향)

  • Song, Kyu-keun
    • Journal of Advanced Marine Engineering and Technology
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    • v.39 no.9
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    • pp.870-875
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    • 2015
  • Diesel engines are widely used due to superior power and fuel consumption, however there are many challenges in exhaust gas management. Exhaust gas recirculation (EGR) is the most effective technique for reducing mono-nitrogen oxide (NOx) emissions in a diesel engine, in comparison with other catalytic technologies. In addition, the technology has a number of advantages in terms of economic efficiency and implementation. In this study, the effects on the power and exhaust characteristics of diesel engines equipped with EGR systems were investigated. It was found that as the EGR rate increased, horsepower expressed as IHP and BHP decreased. The net effect of the application of EGR was measured at various engine speeds. EGR technology caused decreases in BHP of around 9% during low engine speed and 3.5% during high engine speed. Additionally, NOx emissions reduced as the EGR rate increased, and increased as engine speed increased. However, smoke emissions increased as the EGR rate increased, and decreased as engine speed increased. The optimum operating conditions and ERG rate to simultaneously achieve minimum NOx and smoke emissions were investigate. It was found that as the EGR rate increased, optimal operating speed for minimal NOx and smoke also increased. Keywords: Diesel engine, Exhaust gas recirculation, Power perfomance, Emission characteristics, NOx, Smoke

Ginseng Gintonin Activates the Human Cardiac Delayed Rectifier K+ Channel: Involvement of Ca2+/Calmodulin Binding Sites

  • Choi, Sun-Hye;Lee, Byung-Hwan;Kim, Hyeon-Joong;Jung, Seok-Won;Kim, Hyun-Sook;Shin, Ho-Chul;Lee, Jun-Hee;Kim, Hyoung-Chun;Rhim, Hyewhon;Hwang, Sung-Hee;Ha, Tal Soo;Kim, Hyun-Ji;Cho, Hana;Nah, Seung-Yeol
    • Molecules and Cells
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    • v.37 no.9
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    • pp.656-663
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    • 2014
  • Gintonin, a novel, ginseng-derived G protein-coupled lysophosphatidic acid (LPA) receptor ligand, elicits $[Ca^{2+}]_i$ transients in neuronal and non-neuronal cells via pertussis toxin-sensitive and pertussis toxin-insensitive G proteins. The slowly activating delayed rectifier $K^+$ ($I_{Ks}$) channel is a cardiac $K^+$ channel composed of KCNQ1 and KCNE1 subunits. The C terminus of the KCNQ1 channel protein has two calmodulin-binding sites that are involved in regulating $I_{Ks}$ channels. In this study, we investigated the molecular mechanisms of gintonin-mediated activation of human $I_{Ks}$ channel activity by expressing human $I_{Ks}$ channels in Xenopus oocytes. We found that gintonin enhances $I_{Ks}$ channel currents in concentration- and voltage-dependent manners. The $EC_{50}$ for the $I_{Ks}$ channel was $0.05{\pm}0.01{\mu}g/ml$. Gintonin-mediated activation 1 of the $I_{Ks}$ channels was blocked by an LPA1/3 receptor antagonist, an active phospholipase C inhibitor, an $IP_3$ receptor antagonist, and the calcium chelator BAPTA. Gintonin-mediated activation of both the $I_{Ks}$ channel was also blocked by the calmodulin (CaM) blocker calmidazolium. Mutations in the KCNQ1 $[Ca^{2+}]_i$/CaM-binding IQ motif sites (S373P, W392R, or R539W)blocked the action of gintonin on $I_{Ks}$ channel. However, gintonin had no effect on hERG $K^+$ channel activity. These results show that gintonin-mediated enhancement of $I_{Ks}$ channel currents is achieved through binding of the $[Ca^{2+}]_i$/CaM complex to the C terminus of KCNQ1 subunit.

Induction of Physiological Sex-Reversal and Gynogenetic Diploid in Rainbow Trout, Oncorhynchus mykiss (무지개송어의 생리학적 성전환과 자성발생 2배체 유도)

  • Lee, Cheul-Ho;Kim, Dae-Jung;Jeong, Chang-Hwa;Choi, Gyeong-Cheol;Lee, Chae-Sung;Kim, Dong-Soo
    • Journal of Life Science
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    • v.20 no.11
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    • pp.1634-1639
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    • 2010
  • This study was conducted to increase the efficiency of farming practice in rainbow trout, Oncorhynchus mykiss, by sex reversal and chromosome-set manipulation techniques. To obtain phenotypic males, hormonal sex reversal was carried out using an exogenous hormone treatment method. 5 mg of 17 alpha-methyltestosterone per kg diet was supplied for 82 days after first feeding at $10^{\circ}C$ and $13^{\circ}C$. More than 93% of the male population was produced by this method and growth of hormone-treated fish at $13^{\circ}C$ was faster than that of untreated bi-sexual groups. Induced diploid gynogenesis was carried out using artificial insemination of UV-irradiated sperm into haploid eggs. Based on the appearance of the rate of haploid syndrome and survival of embryo, a UV ray dose of at least $3,600\;erg/cm^2$ was required to inactivate rainbow trout sperm genetically. Haploid embryos were restored to diploid by blocking the extrusion of the second polar body using heat shock treatment at $28^{\circ}C$ for 20 min, 10 min post insemination. Gynogenetic diploid sex ratios were confirmed after maturation of the fish erythrocyte measurements and chromosome counts.

Intraspecies Androgenesis in Mud Loach (Misgurnus mizolepis): I. Optimization of the Egg Inactivation and Haploid Androgenesis Using Transgene Marker (미꾸라지(Misgurnus mizolepis)의 웅성발생성 처녀생식: I. 형질전환 유전자 표지를 이용한 웅성발생성 반수체 유도의 최적화)

  • Nam Yoon-Kwon;Noh Choong-Hwan;Kim Dong-Soo
    • Journal of Aquaculture
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    • v.19 no.3
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    • pp.166-172
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    • 2006
  • Induced androgenesis, a form of artificial parthenogenesis is an important tool for the generation and use of genetically isogenic or clonal fish strain. An optimized protocol for the genetic inactivation of mud loach (Misgurnus mizolepis) oocytes (i.e. production of androgenetic haploid) was developed using UV-irradiation. Various dose levels of UV significantly affected the fertilizing capacity of the eggs, hatchability of embryos and incidence of haploidy. Based on the extensive examinations of treatment conditions on embryo viability and haploid incidence, the optimum dose level of UV irradiation was turned out to be $10,800ergs/mm^2$ with 56.9% of hatching success and 94.6% of haploidy. The overall yield of putative androgen under optimized treatment condition was more than 50% out of total eggs inseminated. The success of androgenetic reproduction of haploid genome was verified by flow cytometry and PCR amplification of transgene that is exclusive to either one of parental sexes. However, a small portion $(8\sim11%)$ of presumed androgenetic haploid larvae was proven to contain residual DNA fragment(s) from maternal parent.