30 research outputs found
The Reality of a Textbook Development for Teaching Korean Proverbs
No full text이 연구는 필자가 출판한 『속담으로 배우는 한국어 1,2』의 개발 과정과 워칙을 정리하여 보여주고 있다. 두 권으로 구성된 이 교재는 특수한 제대인 속담을 활용하여 개발된 최초의 교재이다. 이 교재 개발을 위해 필자는 제일 먼저 한국어의 속담을 학습한 경험이 없는 외국인 한국어 학습자를 대상으로 한국어 속담을 어떻게 인식하는지 분석을 시도했다. 그런 다음에 널리 사용되는 한국어 교재 속에 포함된 한국어 속담의 현황을 분석했다. 이 두 가지 분석을 통해 한국어를 배우는 외국인 학습자를 위해서 속담을 활용한 특별한 교재가 필요하다는 것이 여실히 입증된다.
위 분석을 바탕으로 하여 필자는 한국어 속담 교재의 개발에 필요한 원칙, 개발 과정, 교재에 포함된 속담을 선정한 목적과 기준을 열거하였으며, 속담의 활용을 보여주는 예문의 구성과 그 속담들과 관련된 한국 문화에 대한 정보 등을 제공하는 원칙을 제시했다. 이 연구는 이러한 과정을 거쳐 두 권의 교재에 포함된 총 103개의 속담을 비롯하여, 그 속담들과 관련된 관용표현과 문화 항목이 수록된 목록을 제시하고 있으며, 교재의 한 단원을 구체적인 예로 들어 그 내용이 어떻게 구성되었는지 그 실제를 보여준다.
This paper is attempt to show the development process and principles of the two-volumed textbooks Learning Korean through Proverbs 1&2, which the author has published. These two volumes are the first specialized textbooks that use proverbs as their material. The paper has made survey analyses on how foreign learners(esp. Chinese students) of Korean infer meanings out of Korean proverbs, while not being taught any of them, and on the representation of Korean proverbs in a widely-used Korean language textbook. These analyses clearly show the need for teaching Korean proverbs to learners of Korean as a second or foreign language and for developing specialized textbooks using proverbs. Then the author mentions his principles of developing the textbooks, including the aims and the criteria of selecting proverbsm composing reading texts to show real usage of the proverbsm representing information on Korean culture having associations with them, etc. He shows a list of the whole 103 proverbs, idiomatic expressions and cultural items connected with the proverbs and then provides a sample chapter out of the books to present the concrete make-up and contents of the textbooks
(A) cephalometric study of Korean adult with normal occlusion by archial analysis
No full text치의학과/석사[한글]
악골 기형을 외과 -교정 혼합 술식을 이용하여 치료하기 위해서는 치아 및 치조골을 포함한 악골의 위치, 크기, 형태의 정확한 파악이 절실히 요구된다.
기왕의 분석법들은 대부분 어느 특정한 방사선학적 기준을 중심으로한 정량적인 방법에 중점을 두었으나 이는 각 개인에 따라 안모가 클 수도 있고 적을 수도 있다는 것을 고려할 때 각개인의 안모 유형은 절대치보다는 균형과 비례관계에 의한 비율로 평가되는 것이
더 타당하다고 사료된다.
이에 저자는 비율에 의한 한국인의 안면 골조직의 정상적인 위치적 관계를 발견하여 이를 악교정 수술의 진단 및 치료에 적용하기 위하여 정상 교합을 가진 성인 남자 29명과 여자 25명의 두부 방사선 규격 사진을 호선 분석법 (Archial Analysis)에 의거, 계측 분석하여 다음과 같은 결론을 얻었다.
1. 남녀별 기준치를 얻었고 표준편차, 표준오차를 작성하였다.
2. 전후 수평비 계측에서 간 계측항목은 각각의 준호에 대하여 남녀 모두 다소 후방 위치하였다.
3. 수직 고경비 계측에서 전후방 모두 하안면부가 상안면부에 비해 컸다.
4. 두개저에 비해 하악체의 길이가 컸다.
5. 각 계측항목의 남녀별 유의차는 없었다.
[영문]
Accurate evaluation of position, size and morphology of jaws including teeth and alveolar bone is absolutely required to treat dentofacial deformities using combination of surgical-orthodontic technique.
Previous analytic methods for orthognathic surgery were mostly forcused on quantative method based on specific cephalometric landmarks. However, considering these could vary in size of facial form for each individual, it is considered better for the facial form of each individual to be evaluated by the ratio between balance and proportional relationship than absolute value.
In order to find some acceptably normal positional relationship in the architecture of the head and apply them to diagnosis and treatment in orthognathic surgery, the author used the lateral cephalometrics of 29 adult men and 25 adult women with normal occlusion.
The analysis were based on Archial analysis.
The conclusion were as follows;
1) The mean values, standard deviations and standard errors of men and women each were obtained.
2) In the evaluation of the proportion of profile anteroposteriorly, each measured items companing to reference arc were all positioned some posteriorly.
3) In the evaluation of vertical proportions, all anterior and posterior lower faces were longer than the upper faces.
4) The length of mandibular corpus was longer than that of the cranial base.
5) No significant differences were noticed in measured values between men and women.restrictio
The Experience of Modern Tourism in the Diary of Apo
No full text본 논문은 1969년부터 2000년까지의 급속한 산업화 기간 동안 에서 나타난 농민 권순덕의 근대적 관광 경험의 특징을 살펴보기 위하여 노동과 관광의 개념, 관광활동의 구체적인 내용, 그리고 관광활동에서 드러난 양가성을 고찰하였다. 권순덕은 노동중심의 가치관에 근거하여 여가는 낭비적인 일로 여기고 관광은 여러 곳의 장소를 방문하는 것으로 인식하여 자연경관과 문화유적지 중심의 관광을 한다. 권순덕이 경험한 관광활동의 특징은 단체관광에서 개인관광 및 체험중심의 관광으로 변화를 보여 주고 있고, 가족여행과 해외여행 경험이 없으며, 공동체 연대를 증진시키는 통합적 기능이 강하였다. 권순덕에게 관광은 관광절차의 합리화와 객관화된 성적 욕망이 공존하는 양가성을 노출한다. 권순덕의 여행 전체를 살펴볼 때 여행과 관련된 자원도 풍성해지고, 여행횟수도 늘고 기간도 길어지지만 개인의 삶을 뒤돌아보고 성찰할 수 있는 진정한 의미의 개인 여행이 부족하였다, 마지막으로 본 논문의 의의는 그동안 소홀하였던 농민 관광의 특징을 밝혀낼 수 있었다는 것이다.This paper examines the ways in which a Korean farmer underwent modern tourism, focusing on the concept of labor and tourism, tourist activities, and ambivalence, from 1969-2000 during the rapid industrialization process in the Diary of Apo. Gwon Sun-Deok, who is an author of the Diary of Apo, considered leisure as an useless activity based on his labor-centered perspective. His definition of tourism is focused on visiting attractive places rather than authenticity of the tourist experiences. In the modern tourism of Gwon Sun-Deok, two main features are identified: (1) Gwons mass tourim practices slowly changed to small group tour and experience tourism, (2) He had no experience of family trip and overseas travel, and his tourism emphasized the integral role of tourism for the rural community. The apparent manifestation of ambivalence in Gwons tourism practice comes from the conflict between the rationalization of tourism process and objectified sexuality in the tourist site. In the general sense, on the one hand, his tourism experienced continued growth and deepening diversification, on the other hand, it revealed the lack of real meaning of tourism due to the lack of understanding of history and culture of tourist sites
MECHANICAL AND MICROSTRUCTURAL CHARACTERISTICS OF MODIFIED SULFUR POLYMER COMPOSITES
No full textDepartment of Urban and Environmental Engineering (Urban Infrastructure Engineering)Modified sulfur polymer composite has been developed to replace hydraulic cement concrete in specific applications. Because it has superior properties including the rapid development of high compressive strength, resistance to water environments, and resistance to strong acid and saline attack compared with the hydraulic cement concrete. Most of all, the fabrication of modified sulfur composites excludes water due to the thermoplastic properties of modified sulfur. Thus, all the raw materials such as aggregate and micro-fillers can be easily mixed with plastic modified sulfur to produce the modified sulfur composite. Early in the development of sulfur composites, however, elemental sulfur mostly from the distillation of crude oil in petroleum refineries was used as a binder. The composites made of elemental sulfur presented not only severe curing contraction but also inferior durability in weathering and chemical environments. Considering the aforesaid problems, many researchers developed modified sulfur polymers by reacting the elemental sulfur with a variety of chemical additives at a certain reaction temperature and time. The modified sulfur polymers had alternating compositions according to the reaction conditions such as the types of chemical additive, reaction temperature, and reaction time. Through a modification process, the composition of modified sulfur mixture was composed of abundant polysulfide products along with a reduced free elemental sulfur such as orthorhombic, monoclinic, and amorphous sulfur chains. Such a converted composition considerably enhanced the mechanical and durability properties of sulfur composites. The term, modified sulfur polymer, indicates the final reaction product from a mixture of elemental sulfur and chemical additive. If a certain micro-filler accounts for a part of the modified sulfur polymer, the mixture is usually called as sulfur polymer cement.
Among various modified sulfur polymers, this study employed a dicyclopentadiene (DCPD)-modified sulfur polymer as a binder, which is one of the commercially available products. Based on this modified sulfur polymer, total five research topics were carried out step by step in this study.
First, different proportions of modified sulfur composites were developed by replacing a portion of the modified sulfur polymer by fly ash and rubber powder. Both the fly ash and the rubber powder were employed to be a substitute for fine aggregate and to enhance the mechanical properties of modified sulfur composites by reducing thermal curing shrinkage. An increasing portion of the fly ash of up to 50 vol.% resulted in a continuous rise of compressive strengths with a given portion of rubber powder. Moreover, the rubber powder also significantly reduced the unit weight of modified sulfur composites without sacrificing the compressive strength. Finally, a series of microstructural analysis suggested the rationales for the enhanced mechanical properties in terms of crystalline phase transition, morphological transition, and porosity.
Second, in a similar way as the first research topic, modified sulfur composites included rubber powder, and a blend of Portland cement and fly ash as the binary cement that rendered the different particle characteristics (i.e., particle shape, particle size distribution) of micro-fillers as compared with sole fly ash or Portland cement. An increasing portion of the binary cement generally induced the higher compressive strengths of the modified sulfur composites than those with only fly ash. This was likely due to the larger indentation modulus of Portland cement than fly ash. In addition, the use of rubber powder contributed to a reduced unit weight of sulfur composites without a severe strength reduction. Most of all, because all the crystalline phases from the binary cement remained intact in hardened sulfur composites, the feasibility of using the binary cement as a self-healing material for cracked sulfur composites was confirmed empirically.
Third, considering the brittleness of modified sulfur composites except those containing rubber powder identified in the first and second research topics, a series of fiber-reinforced sulfur composites were developed and examined to convert the brittleness of modified sulfur composites into a more ductile manner, and to acquire multiple micro-cracks especially under flexures. Two micro fibers including steel and electrical chemical resistant (ECR) glass fiber were incorporated in the mixtures. By varying the total fraction of micro fibers and adjusting the relative volumetric ratios between steel and glass fiber, the flexural stress-strain responses of modified sulfur composites were greatly modified, which was supported by the change of porosity and the uniform strain distribution revealed by a digital image correlation (DIC).
Fourth, the combined effect of particle characteristics of micro-fillers and temperature on the rheological properties of fresh sulfur composites was examined through a rheometer test. Because both the portion of micro-filler and mixing temperature have been critical in determining the workability of modified sulfur composites, the author adjusted the surface areas of a given portion of binary cement and set the temperature at 120??? or 140???. Overall, both the yield stress and plastic viscosity of the modified sulfur composites were higher in 140??? than 120???. Especially, the result of mini slump flow of fresh modified sulfur composites was compared with the rheology test results at 140???. Thus, the results from the rheology and the mini slump test were deemed to suggest an optimal temperature range favorable for placement.
Finally, considering the feasibility of using cementitious materials as self-healing materials in the sulfur composites, total eight mix proportions of self-healing modified sulfur composites were developed and examined. The modified sulfur composites were comprised of a binary cement of calcium sulfoaluminate (CSA) expansive agent and Portland cement, superabsorbent polymer (SAP) powder, and fine aggregate. After through crack was made on each sample, all the samples were exposed to two wet environments: one was water curing, and the other was water permeability test. Each of them was dedicated to building different self-healing conditions. While the water curing gave a stable self-healing condition to the cracked samples, the water permeability test without any water curing was analogous to a real water intrusion through the cracks of a certain structure. For each sample, the extent of self-healing was monitored and evaluated by the optical microscope images of surface crack and elastic wave tests, respectively at specified ages. Moreover, computed tomography was used to confirm the recovery of inner crack width after 7 days of water curing. Through a series of tests, it was revealed that a higher ratio of CSA expansive agent than Portland cement in a binary cement promoted the self-healing of through cracks further with the swelling of SAP particles on crack surfaces.clos
A Study on the Author and Painting Style of Saroseonggudo-gwon in the Latter-half Joseon period
No full textCompositive role of refractory element Mo in improving strength and ductility of face-centered-cubic complex concentrated alloys
No full textComplex concentrated alloys (CCAs) with a face-centered-cubic (FCC) structure exhibit remarkable mechanical properties, introducing the expansion of compositional space in alloy design for structural materials. The formation of a single solid-solution phase is enabled by configuring various 3d-transition elements, while doping other elements even of a small portion generally leads to the formation of brittle intermetallic compounds. Herein, we demonstrate through a systematic investigation of single FCC (CoNi)100-xMox alloys that a wide range of refractory element Mo can simultaneously improve the strength and ductility while sustaining the solid-solution structure. The addition of Mo with a larger atomic size than those of 3d-transition elements introduces severe lattice distortion in the FCC lattice and causes grain-boundary segregation enriched by Mo atoms. In addition, increasing Mo content effectively reduces the stacking fault energy (SFE). The increased lattice distortion with Mo content enhances the solid-solution strengthening of the alloys. Besides, along with reduced SFE and stabilization of the dislocation emission site by grain-boundary segregation, this elevated solid-solution strengthening increases grain-boundary strengthening, reaching a yield strength of ∼1 GPa. Moreover, the reduction of SFE with increasing Mo results in the transition of dislocation substructures and the refinement of deformation twins, allowing for enhanced strain-hardening capability and thus ∼1.3 GPa tensile strength and ∼50% ductility. Such compositive and synergetic effects of refractory element Mo enable the CCAs with a single FCC solid solution to overcome the strength and ductility trade-off.Green Open Access added to TU Delft Institutional Repository 'You share, we take care!' - Taverne project https://www.openaccess.nl/en/you-share-we-take-care Otherwise as indicated in the copyright section: the publisher is the copyright holder of this work and the author uses the Dutch legislation to make this work public.Team Marcel Sluite
Effect of filler particle characteristics on yield stress and viscosity of fresh sulfur composites
No full textThe amount and properties of fillers greatly affect the workability of sulfur composites. In addition, modified sulfur has fluidity only above approximately 115 degrees C, and its rheology may depend on the temperature. This study aimed to mainly quantify the effects of mixing temperature and filler particle characteristics on the yield stress and viscosity of fresh sulfur composites by applying suspension rheology theory. Sulfur composites containing mineral fillers, such as different blends of fly ash and Portland cement, were examined. The test results revealed that the yield stress of the sulfur composites was influenced by both the type and volumetric ratio of fillers, whereas the viscosity was governed by the specific surface area of filler particles. At 140 degrees C, the sulfur composites attained a higher yield stress and viscosity than at 120 degrees C. In addition, the intrinsic viscosity of the sulfur composites was dependent on the filler type and not on its volume ratio. The sulfur composites were well described by conventional yield and viscosity models commonly applied for suspension materials, when the filler volume ratio was less than 30%. (C) 2021 The Author(s). Published by Elsevier B.V
Creep-fatigue interaction on estimation of lifetime and fatigue damage of F82H
No full textIn this study, creep-fatigue (CF) tests on F82H at 823 K were conducted according to the standard specimen and
requirement of ASTM. Tension holding (TH) showed higher lifetime than compression holding (CH). Compared
with 9Cr-1Mo-V steels, CF lifetime degradation was not observed at the holding time less than 0.05 h in case of
CH and 0.17 h in case of TH. CF damages were summarized from the CF test results by Campbell method. The
obtained damages distributed around CF damage envelope of Grade 91 in ASME NH. CF damage of cylindrical
water-cooled ceramic breeder (WCCB) test blanket module (TBM) container at the zenith of hemisphere body
under the ITER thermo-mechanical load was calculated. The calculated damage located within of the damage
envelope of Grade 91. It was indicated that the present design of cylindrical WCCB TBM might resist CF interaction
under the ITER thermo-mechanical load conditions.conference pape
Synergistic Role of Low-Strength Ultrasound and Co-Digestion in Anaerobic Digestion of Swine Wastewater
No full textSwine manure poses significant challenges for anaerobic digestion due to its low carbon-to-nitrogen (C/N) ratio and elevated ammonia concentrations, both of which restrict methane generation. This study investigated the impact of integrating low-intensity ultrasound with co-digestion of piggery wastewater and food waste leachate. Laboratory-scale upflow anaerobic sludge blanket (UASB) reactors were employed under four operational conditions to evaluate anaerobic digestion performance, track shifts in microbial community structure, and assess the abundance of antibiotic resistance genes (ARGs). Co-digestion significantly enhanced methane production, yielding 1.3–3.2 times more than manure alone, while low-intensity ultrasound further increased methane yields by approximately 36–44% at high loading rates. Moreover, coupling low-intensity ultrasound with co-digestion led to the most rapid recovery following an overloading shock. Unexpectedly, ultrasound treatment alone increased the expression of certain ARGs (tetG, sul1, ermB) and the Integrase gene (intI1), while co-digestion led to a reduction in these genetic markers. These findings clearly indicate that the concurrent application of co-digestion and low-intensity ultrasound achieved the highest methane yield, the fastest recovery after organic overloading, and greater suppression of specific ARGs
