• 한국정보과학회논문지:소프트웨어및응용
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• 제33권9호
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• pp.802-809
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• 2006

J2ME 모바일 프로그램은 모바일 기기가 보편화되면서 그 사용이 증가하고 있으며 J2ME 프로그램은 자원이 제한된 모바일 환경에서 실행되므로 자원의 효율적인 사용이 매우 중요하다. 또한 J2ME 프로그램은 대부분 이벤트-구동 프로그램이며 효과적인 이벤트 관리가 프로그램의 신뢰성 및 효율적인 자원 사용에 많은 영향을 미치며 이벤트 관련 디버깅은 매우 어려운 부분이다. 본 연구에서는 실행 중에 실시간으로 이벤트 발생 및 처리 정보를 보여줄 수 있는 시스템을 설계 개발하였다. 이 시스템은 사용자 옵션에 따라 사용자가 관심 있는 이벤트만을 실행 중에 추적할 수 있으며 실행 후에 이벤트 관련 요약 프로파일 정보를 제공한다.

• 한국재료학회지
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• 제28권11호
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• pp.611-614
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• 2018

Laminate composites composed of $0.95Pb(Zr_{0.52}Ti_{0.48})O_3-0.05Pb(Mn_{1/3}Sb_{2/3})O_3$ piezoelectric ceramic and Fe-Si-B based magnetostrictive amorphous alloy are fabricated, and the effect of control of the areal dimensions and the thickness of the piezoelectric layer on the magnetoelectric(ME) properties of the laminate composites is studied. As the aspect ratio of the piezoelectric layer and the magnetostrictive layer increases, the maximum value of the ME voltage coefficient(${\alpha}_{ME}$) increases and the intensity of the DC magnetic field at which the maximum ${\alpha}_{ME}$ value appears decreases. Moreover, as the thickness of the piezoelectric layer decreases, ${\alpha}_{ME}$ tends to increase. The ME composites exhibit ${\alpha}_{ME}$ values higher than $1Vcm^{-1}Oe^{-1}$ even at the non-resonance frequency of 1 kHz. This study shows that, apart from the inherent characteristics of the piezoelectric composition, small thicknesses and high aspect ratios of the piezoelectric layer are important dimensional determinants for achieving high ME performance of the piezoelectric-magnetostrictive laminate composite.

• Environmental Engineering Research
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• 제22권3호
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• pp.312-319
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• 2017

The treatment of dyeing wastewater is not easy because dyes are mainly aromatic, heterocyclic compounds. The most effective technologies and methods to treat dyeing wastewater are costly and involve materials that are difficult to regenerate after use. Therefore, it is necessary to develop cost-effective, eco-friendly technologies to treat dyeing wastewater. The aim of this study was to investigate the removal of sulfur blue 11 (CI 53235) anionic dye using methyl esterified sericite (ME-sericite) adsorbents in an aqueous solution. The results are discussed in terms of the ME-sericite particle size, temperature, pH value and initial sorption rate according to the initial sulfur blue concentration. In addition, we analyzed the adsorption kinetics using a Pseudo-second-order model with the desorption and reusability. The methyl esterification caused a considerable increase in the specific surface area from 4.45 to $17.62m^2/g$. The ME-sericite adsorbents successfully removed > 98% of the sulfur dye in the aqueous solution. For the adsorption of 1 mg of sulfur dye, approximately 4.6 to 6.6 g/L ME-sericite were required. The desorption process was carried out by mixing a NaOH eluent to desorb 90.56% of the sulfur dye with 2 h of contact time. Thus, the ME-sericite is a promising adsorbent to treat dyeing wastewater due to its low dose requirement, high removal efficiency and inexpensive material.

• 수산해양교육연구
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• 제18권1호
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• pp.19-30
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• 2006

For fishery stock assessment and optimum sustainable yield of anchovy in Korea, surplus production(SP) models and a maximum entropy(ME) model are employed in this paper. For determining appropriate models, five traditional SP models-Schaefer model, Schnute model, Walters and Hilborn model, Fox model, and Clarke, Yoshimoto and Pooley (CYP) model- are tested for effort and catch data of anchovy that occupies 7% in the total fisheries landings of Korea. Only CYP model of five SP models fits statistically significant at the 10% level. Estimated intrinsic growth rates are similar in both CYP and ME models, while environmental carrying capacity of the ME model is quite greater than that of the CYP model. In addition, the estimated maximum sustainable yield(MSY), 213,287 tons in the ME model is slightly higher than that of CYP model (198,364 tons). Biomass for MSY in the ME model, however, is calculated 651,000 tons which is considerably greater than that of the CYP model (322,881 tons). It is meaningful in that two models are compared for noting some implications about any significant difference of stock assessment and their potential strength and weakness.

• 한국세라믹학회지
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• 제22권3호
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• pp.72-76
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• 1985

Single crystals of the compound MeI $(LiMoO_4)$ and $Me^I(LiWO_4)$ ($Me^I=K$, Rb, Cs) were synthesized by slow evaporation from aqueous solution and bycooling from melt. The compounds of potassium or rubidium are hygroscopic and they form easily hydrated crystals $Me^I LiMoO_4$.$H_2O$ or $Me^ILiMoO_4$.$H_2O$ or $Me^ILiWO_4$.$H_2O$ from aqueous solution. The structures of these hydrated crystals are each other isotypic and they are built up of distorted layers of $(LiMoO_5)$ or $(LiWO_5)$. There exist two types of tetrahedral framework structures in this group of anhydrous molybdates and tung-states ; tridymite-type and cristobalite-type. $KLiMoO_4$ and $KLiWO_4$ have two types of polymorphic structures where as only the cristobalite-type is found in the Rb-and Cs-compounds. The system $KLiSO_4-KLiMoO_4$ was studied. Two components are almost immiscible but there eixst a narrow area of solid solution on the side of sulfate in the system.

• Bulletin of the Korean Chemical Society
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• 제16권1호
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• pp.30-33
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• 1995

UV photolysis of the titled polysilane (Me3Si)3SiMe (I) in the presence of a trapping agent of 2-propenol has been performed to investigate the interaction of short-lived silicon species formed from the photolysis of I with 2-propenol. Product studies show that the Me(Me3Si)Si: (II) and (Me3Si)3Si${\cdot}$(III) are primarily formed as the major reactive species which saturate their valencies via O-H insertion and H-abstraction, respectively. Some products are unstable toward further secondary reaction such as photodissociation and intermolecular reaction. The PM3 semiempirical calculations are performed to deduce the energetics of the photoinduced chemical reactions of I with the substrate.

• 한국산업정보학회논문지
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• 제12권2호
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• pp.1-15
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• 2007

본 연구는 모바일게임 개발에 있어 가장 편리한 도구로 알려져 오고 있는 J2ME를 이용하여 하나의 모바일게임을 개발해 봄으로써 자바 모바일게임의 개발과정을 쉽게 이해하고 J2ME의 취약점을 보완할 수 있는 개발 방법을 제시해 보고자 함에 그 목적이 있다. 아울러 자바 모바일게임의 개발과정에서 사용하는 기존의 도스(DOS) 모드에서의 Batch 파일 이용방법과 J2ME Wireless Toolkit 이용방법 대신에 새로운 통합 개발환경인 이클립스(Eclipse)를 이용한 모바일게임 개발방법을 소개함으로써 복잡한 명령어나 설치과정을 생각하지 않고 보다 쉽게 모바일게임을 개발할 수 있는 방법을 제시하였다. 이밖에 모바일게임의 환경, J2ME 플랫폼의 구조, 기존연구자의 이론적 연구에 대한 문헌적 고찰을 병행함으로써 J2ME의 어떤 부분이 모바일게임의 특성에 중요하고 모바일게임 개발과정에서 이 중요한 부분을 어떻게 구현하는지를 알아보았다.

• 한국가금학회지
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• 제21권4호
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• pp.267-275
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• 1994

Three dietary ME levels of 3,200, 2,900 and 2,600 kcal /kg in the same 13% single-stage low protein diet were compared to evaluate the effect of ME levels of grower diets on egg-type pullet growth and subsequent laying performance. As the ME levels of grower diets decreased, cumulative feed and protein consumptions increased(P<0.05), however, the ME intake and body weight at 18 wk of age decreased(P<0.05). Grower feed cost decreased as the dietary ME level was decreased, but no significant difference was found among dietary ME levels of grower diets. During the laying period, sexual maturity, hen-day egg production and average egg weight were not significantly affected by the ME levels of grower diet, however, daily feed intake and feed required per egg decreased as the dietary ME level of grower diet was reduced(P<0.05). Results of this study indicate that pullets can be reared on the low ME diet of 2,600 kcal /kg and it would he economical to utilize the low energy diet during the growing period when they are reared on a 13% single-stage low protein diet.

• Bulletin of the Korean Chemical Society
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• 제17권3호
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• pp.234-238
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• 1996

Second-order rate constants have been measured spectrophotometrically for the reaction of p-nitrophenyl acetate (PNPA) with morpholine, piperazine and piperidine in MeCN-H2O mixtures of varying compositions. The rate of the present aminolysis decreases upon additions of MeCN into H2O up to near 30-40 mole % MeCN and remains nearly constant upon further additions of MeCN. The reaction of PNPA with anionic nucleophiles, such as HO-, p-chlorophenoxide and butane-2,3-dione monoximate, has also exhibited two distinguishable reactivity zones. However, the reactivity trend for the anionic nucleophiles is quite different from the one obtained for the amine system, e.g. an initial rate decrease in the H2O-rich region followed by an increasing rate trend upon further additions of MeCN in the MeCN-rich region. The rate behaviors shown by the amine system in the MeCN-rich and by the anionic system in the H2O-rich region are unexpected based on the Hughes-Ingold rules. The present unusual rate trends have been attributed to changes in the solvent structure and pKa of the nucleophiles upon the addition of MeCN into H2O. The effect of solvent appears to be more significant for the TS than the GS, and the TS structure is considered to become tighter in the higher MeCN concentration.

• 한국문헌정보학회지
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• 제49권2호
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• pp.291-311
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• 2015

This paper demonstrates the comparative analysis of the similarity and difference between Medical Subject Headings (MeSH) and social tags. Both types of metadata have the same purpose - that is, succinctly abstracting content of a given document - but are created from heterogeneous viewpoints. The former MeSH terms show the aspects of publication related professionals, whereas the latter social tags are from the perspectives of general readers. When both types of metadata are assigned to the same publications, do they consist of different nomenclatures reflecting the heterogeneous viewpoints or are they similar, since both metadata types describe the same publications? Social tags are also compared with family terms of MeSH terms in the given MeSH hierarchy, so as to understand the specificity of social tags, related to MeSH terms. Lastly, given the fact that readers assign social tags in casual ways without any restricted vocabulary, we tested how many social tags contain consumer health terms, which are familiar to laypeople. Through these comparisons, we ultimately aim to examine how much the highly controlled publication index reflects general readers' cognitive understandings and stress the necessity of general readers' involvement in the publication indexing process.