• 한국융합학회논문지
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• 제10권11호
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• pp.533-541
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• 2019

본 연구는 간호대학생의 자기조절학습에 영향을 주는 요인들의 구조 방정식 모형을 만들고 검증하기 위함이다. 이를 위해 재학 중인 간호대학생들에게 자가보고식 설문지를 작성하게 하여 273부의 자료를 구조방정식 모형으로 분석하였다. 분석결과 모형 적합지수는 적절한 수준을 나타내었고, 6개 경로 중 5개 경로는 통계적으로 유의미하여 분산의 68%를 설명하였다. 따라서 간호대학생의 자기조절학습을 증진시킬 수 있도록 자기결정동기, 대인관계유능, 성취목표지향을 향상시키는 교육이 필요하며, 이를 위해 간호대학생의 자율성과 관계성을 증진시킬 역량 강화 프로그램이 개발되어야 할 것이다.

• Smart Structures and Systems
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• 제29권4호
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• pp.577-588
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• 2022

Oil refineries' Fluid Catalytic Cracking Units (FCCU) when in full operation may exhibit strong fluid dynamics caused by turbulent flow in the piping system that may induce vibrations in other mechanical and structural components of the Unity. This paper reports on the experimental-theoretical-computational program performed to get the vibration properties and the dynamic response amplitudes to find out alternative solutions to attenuate the excessive vibrations that were causing fatigue fractures in components of the bottle like reactor-regenerator of an FCC unit in operation in an existing oil refinery in Brazil. Solutions to the vibration problem were sought with the aid of a 3D finite element model calibrated with the results obtained from experimental measurements. A short description of the found solutions is given and their effectiveness are shown by means of numerical results. The solutions were guided by the concepts of structural stiffening and dynamic control performed by a nonlinear pendulum controller whose mechanical design was based on parameters determined by means of a parametric study carried out with 2D and 3D mathematical models of the coupled pendulum-structure system. The effectiveness of the proposed solutions is evaluated in terms of the fatigue life of critical welded connections.

• Journal of Microbiology and Biotechnology
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• 제8권5호
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• pp.509-516
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• 1998

A plasmid vector, pXGPRMATG-lac-Tgx, was developed for overproduction of $\beta$-galactosidase in Escherichia coli using the genetic components of groEx, a heat-shock gene cloned from symbiotic X-bacteria in Amoeba proteus. The vector is composed of intragenic promoters P3 and P4 of groEx, the structural gene of lac operon, transcription tenninator signals of lac and groEx, and ColEl and amp'of pBluescript SKII. The optimized host, E. coli DH5$\alpha$, transfonned with the vector constitutively produced 117,310-171,961 Miller units of $\beta$-galactosidase per mg protein in crude extract. The amount of enzyme in crude extract was 53% of total water-soluble proteins. About 43% of the enzyme could be purified to a specific activity of 322,249 Miller units/mg protein after two-fold purification, using two cycles of precipitation with ammonium sulfate and one step of gel filtration. Thus, the expression system developed in this study presents a low-cost and simple method for purifying overproduced $\beta$-galactosidase in E. coli.

• 응용통계연구
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• 제22권1호
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• pp.181-188
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• 2009

본 논문은 실험단위들의 구조적 특성으로 지분관계를 갖는 실험을 행해야 하는 경우를 가정한다. 지분계획하에서 처리를 구성하는 요인으로 반복측정 요인을 고려한다. 반복측정 요인의 수준들이 비확률화에 의해 지분구조의 실험단위들에 배정될 때, 비확률화에 따른 실험의 특성을 감안한 모형으로 복합대칭의 공분산 구조하에서 혼합효과 모형을 논의하고 있다. 처리의 일부 요인들이 시간 또는 공간상의 제약으로 인해 지분구조의 실험단위들에 임의적으로 배정될 수 없을 때, 지분구조의 실험단위들에 대한 반응 값들은 어떤 구조적 상관관계를 나타내는 값들로 관측될 수 있음을 예상할 수 있다. 자료의 구조적 상관성을 고려한 공분산 구조하의 선형모형으로 확률요인과 고정요인을 포함하는 혼합효과의 모형을 제시하고 모형내 미지모수들에 대한 추론방법을 다루고 있다.

• Structural Engineering and Mechanics
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• 제62권5호
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• pp.643-649
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• 2017

Masonry walls are amongst the oldest building systems. A large portion of the research on these structures focuses on the load-bearing walls. Numerical methods have been generally used in modelling load-bearing walls during recent years. In this context, macro and micro modelling techniques emerge as widely accepted techniques. Micro modelling is used to investigate the local behaviour of load-bearing walls in detail whereas macro modelling is used to investigate the general behaviour of masonry buildings. The main objective of this study is to investigate the elastic behaviour of the load- bearing walls in masonry buildings by using micro modelling technique. In order to do this the brick and mortar units of the masonry walls are modelled by the combination of plane truss elements and plane frame elements with no shear deformations. The model used in this study has fewer unknowns then the models encountered in the references. In this study the vertical frame elements have equivalent elasticity modulus and moment of inertia which are calculated by the developed software. Under in-plane static loads the elastic displacements of the masonry walls, which are encountered in literature, are calculated by the developed software, where brick units are modelled by plane frame elements, horizontal joints are modelled by vertical frame elements and vertical joints are modelled by horizontal plane truss elements. The calculated results are compatible with those given in the references.

• 한국정보처리학회논문지
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• 제2권2호
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• pp.229-236
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• 1995

문장의 개념세계는 체언과 용언으로서 이루어 진다. 문장의 의미적 중심은 용언 이고, 체언은 용언의 구속을 받으며, 이들은 다양하게 결합한다. 본 논문은 한국어의 문에서 체언과 용어의 결합관계를 분석하고, 형태소 해석의 결과로부터 도출한 구 단 위문을 가변패턴네트를 구성함으로써 구문 및 의미해석을 하여 절형식의 개념단위를 추출한다. 또한 종래의 제한된 혼절 이론을 일반문에 확장하고, 장문을 단문으로 자동 분리하여 논리적인 개념단위의 절 형식으로서 지식베이스를 구축하고 질문응답시스템 으로의 응용을 시도하였다.

• 한국언어정보학회지:언어와정보
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• 제14권1호
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• pp.165-196
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• 2010

The primary goal of this paper is to propose methods of enriching two heterogeneous ontologies: Sejong Semantic Classes (SJSC) and KorLexNoun 1.5 (KLN). In order to achieve this goal, this study introduces the pros and cons of two ontologies, and analyzes the error patterns found during the fine-grained manual mapping processes between them. Error patterns can be classified into four types: (1) structural defectives involved in node branching, (2) errors in assigning the semantic classes, (3) deficiency in providing linguistic information, and (4) lack of the lexical units representing specific concepts. According to these error patterns, we propose different solutions in order to correct the node branching defectives and the semantic class assignment, to complement the deficiency of linguistic information, and to increase the number of lexical units suitably allotted to their corresponding concepts. Using the results of this study, we can obtain more enriched ontologies by correcting the defects and errors in each ontology, which will lead to the enhancement of practicality for syntactic and semantic analysis.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2014년도 제46회 동계 정기학술대회 초록집
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• pp.481.2-481.2
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• 2014

Bulk hetero junction (BHJ) polymer solar cell (PSCs) is one of the most promising fields as alternative energy source. Especially, the development of new p-type conjugated polymer is one of the main issues to get core technology. In this study, we investigated the chemical doping effects of incorporating 3,6-carbazole units into conjugated polymers based on 2,7-carbazole. We assessed the structural effects of this chemical doping by measuring the photovoltaic device performance of the copolymers with and without annealing. Note that the use of nanostructures in the bulk heterojunction layer could be a major obstacle to commercialization because nano-morphologies are frequently unstable at high temperatures. Therefore, the development of thermally stable polymer:fullerene blends with optimized PCEs is an important goal in this area of research. We studied the morphologies of the copolymers incorporating 3,6-carbazole units resulting from thermal annealing to investigate the effects of the difference between the T g values of the 2,7-carbazole unit and the 3,6-carbazole unit.

• 한국세라믹학회지
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• 제20권3호
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• pp.236-242
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• 1983

The purpose of present study is to find the structures physical properties and their inter-relations in the system of (60-x) PbO.xMO.$40B_2O_3$ glasses where MO represents for ZnO and CdO. The experiments such as differential thermal analysis infrared spectral analysis X-ray diffraction analysis density and thermal expansion measurements have been done. From infrared spectral analysis the structural units of glasses and the corresponding crystallized glasses were com-posed of $BO_3$ triangles and $BO_4$ tetrahedra. These basic units found in $PbO-B_2O_3$ binary glass system did not charge even though the divalent metallic oxides were substituted for PbO. The structures of these ternary glasses were more coalescenced than $PbO-B_2O_3$ binary glass system. This fact was supported bydecrease in thermal expansion coeffici-ent and molar volume with substitution of divalent metallic oxide for PbO. Crystalline phases obtained from the heat treatment of the $PbO-ZnO-B_2O_3$ glasses were 4PbO.2ZnO.$5B_2O_3$ PbO.2ZnO.$B_2O_3$ and unknown phases.

• 한국수산과학회지
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• 제44권6호
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• pp.630-634
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• 2011

Enzymatic hydrolysate of porphyran from Porphyra yezoensis was prepared by treatment with ${\beta}$-agarase. The hydrolysate was fractioned into molecular sizes of <3, 3-30, and 30-300 kDa using an ultrafiltration membrane. The membrane fractions were further separated into neutral and anionic fractions using Dowex $1{\times}8$ ion exchange chromatography. After hydrolysis of porphyran with ${\beta}$-agarase, 23.2% of the starting porphyran was recovered as a neutral fraction of low-molecular weight (<3 kDa), and 28.9% remained as an enzyme-resistant anionic fraction of high molecular weight (>300 kDa). Desulfation of porphyran and $^{13}C$-NMR analysis of the anionic fraction of low molecular weight (<3 kDa) showed that the anionic fraction has a backbone consisting of 3-linked ${\beta}$-D-galactose units alternating with either 4-linked a-L-galactose 6-sulfate or 3, 6-anhydro-a-L-galactose units. These results indicate that porphryan is a copolymer of two moieties, about 25% of which are composed of neoagarose moieties and 75% as anionic moieties.