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Cellulose Ester와 Poly(Ethylene Terephthalate) 얼로이의 상용성, 모폴로지 및 열적 특성 연구
김해리 ( Hae Ri Kim ),남병욱 ( Byeong Uk Nam ) 한국공업화학회 2013 응용화학 Vol.17 No.1
Cellulose is a renewable carbon resource as well as an alternative material to replace petroleum- based plastics. Cellulose acetate butyrate (CAB), one of cellulose esters, is resistant to ultraviolet rays, has a lower moisture absorption than cellulose acetate and has an extremely high impact strength. However, it is susceptible to heat and has low flowability in the extrusion process. Poly (ethylene terephthalate) is a lightweight plastic that can be made into a number of different products and has impact resistant properties as well. In this work, Poly (ethylene terephthalate)(PET) and Cellulose acetate butyrate (CAB) were melt blended using twin screw extruder in order to improve properties of bio-based polymer and to enhance processability. The phase morphology of PET/CAB alloys was investigated by Field Emission Scanning Electronic Microscopy (FE-SEM). The compatibility of alloys was analyzed by Differential Scanning Calorimeter (DSC) and Dynamic Mechanical Analyzer (DMA).
김해리 ( Hae Ri Kim ),안성희 ( Sung Hee Ahn ) 한국의료윤리학회 2010 한국의료윤리학회지 Vol.13 No.4
The purpose of this descriptive study was to examine the moral sensitivity and moral distress among clinical nurses in South Korea. Data were collected from 361 nurses between March and April 2009 using the following self-reported questionnaire: the Moral Sensitivity Questionnaire(Han, et al., 2009) and the Nurses` Moral Distress Measurement Tool(Yu, 2003). An SAS program(version 9.1) was used to analyze the data by means of a t-test, ANOVA, and Scheff? test. The mean score of moral sensitivity was 5.13, and the sub-domain of patient-oriented care had the highest score (5.69). The mean score of moral distress was 2.89, and the emotional subdomain had the highest score (3.65). Scores for other sub-domains of moral distress were as follows: recognizable distress (2.94), situational distress (2.86), and behavioral distress (2.67). Moral distress was significantly higher among the nurses who had education beyond the postgraduate level, clinical practice of 3-5 years, working experience in the emergency room, ethics education at a clinic, or experience in moral dilemma. The positive relationship between nurses` moral sensitivity and moral distress were relatively weak. Future research needs to explore the factors that could have an effect on between nurses` moral sensitivity and distress.
김해리(Kim, Hae-Ri),김보람(Kim, Bo-Ram) 대한건축학회 2021 대한건축학회논문집 Vol.37 No.1
The purpose of this study is to analyze the current status and problems of the Ministry of Land, Hanok Professionals Training Project, and to discuss improvement directions. In this study, a structured questionnaire was created to identify the perceptions of trainees, surveyed education demand and satisfaction, and analyzed education status and problems. The conclusion of this study is as follows: 1.When selecting trainees, it is desirable to make it mandatory to be working-level workers in the construction sector in the requirements of the target. 2.To respond to trainee demand, hands-on education should be strengthened and specific complaints about educational facilities and equipment should be investigated. 3.In order to increase the effectiveness of education, it is necessary to consider introducing an actual Hanok construction project into the curriculum. In addition, in order to produce better educational effects in the future, it is necessary to prepare specific guidelines for the educational curriculum.
The Effect of Water Activation on Chemical Modification of Cellulose and Characterization
Hae-Ri Kim(김해리),Byeong-Uk Nam(남병욱) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.2
다양한 종류의 지방산 아실 체인으로 치환된 Cellulose mixed esters(CME)는 재생 가능한 bio-based 폴리머이 다. 셀룰로오스 에스터는 생분해성 고분자로써, 분해되지 않는 석유계 플라스틱을 대체할 미래 고분자 소재이다. 본 연구에서는 개질 실험에 앞서 alpha 셀룰로오스를 40℃의 증류수에 2시간동안 activation하였다. Water-activated 셀룰로 오스와, 다양한 불포화 지방산, 무수 아세트산을 120℃의 lithium chloride/N,N-dimethylacetamide (LiCl/DMAc)용매에서 5시간동안 반응시켜 CME를 합성했다. 세척과 감압을 반복한 후, TGA, FT-IR, 1H-NMR과 FE-SEM를 통해 특성을 관찰하였고, water activation이 셀룰로오스의 수산기 치환에 미치는 영향에 대하여 조사하였다. Cellulose mixed esters (CME), substituted by various fatty acyl chains, are renewable bio-based polyesters. It has lots of potential due to the biodegradable property. In this study, Alpha cellulose was activated for 2h at 40℃ in deionized water prior to synthesis. Homogeneous esterification of CME was accomplished with water-activated alpha cellulose, various saturated fatty acids and acetic anhydride in lithium chloride/N, N-dimethylacetamide (LiCl/DMAc) medium. CME was obtained after 5 hr at 120℃. The filtrated products were characterized using TGA, FT-IR, 1H-NMR and FE-SEM, and the influence of water activation on the total degree of substitution was investigated.
Poly(lactic acid)와 Cellulose acetate butyrate 얼로이의 제조 및 상용성 평가
김해리 ( Hae Ri Kim ),남병욱 ( Byeong Uk Nam ),김승범 ( Seung Beom Kim ) 한국공업화학회 2012 응용화학 Vol.16 No.1
Currently, there is increasing interest in using biodegradable and renewable materials for disposable applications as an alternative of some conventional petroleum plastics. Cellulose ester, particularly preferable for a liquid crystal display device, is prepared from the esterification of cellulose derived from abundant plant. Poly(lactic acid) (PLA) is a promising synthetic biopolymer derived from agricultural feedstock, but it has poor thermal and mechanical properties. In this work, Poly(lactic acid) (PLA) and Cellulose acetate butyrate (CAB) were melt blended using twin screw extruder in order to improve properties of bio-based polymer and to expand applications. The phase morphology of PLA/CAB alloys was investigated by Scanning Electronic Microscopy (SEM). The compatibility of alloys was analyzed by Fourier-Transformation Infrared (FT-IR) and Dynamic Mechanical Analyzer (DMA).
근대한옥의 입식부엌 작업대 배치 및 소요치수에 관한 조사연구
김해리(Kim Hae-Ri),김태영(Kim Tai-Young) 대한건축학회 2009 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.29 No.1(계획계)
The Korean Traditional houses have small capacity, restraints of structure and function as compared to these days. To accept a contemporary life style, they need to be altered or reconstructed. Standup kitchen is an important aspect to reuse Korean traditional houses. Therefore, this research has been conducted to learn how to put work centers when using a standup kitchen in Korean traditional houses. The results of the research are as follows;. Because most of the residents are aged living alones or elderly couples, they aren't demands for a large kitchen. The elements affecting arrangement of standup kitchen are such as the limitation of a narrow module(2.4-2.7m) and an original form of architectural properties. The arrangement of "ㅡ" shaped kitchen counter with complete circulation within original module is inappropriate, so it's found out that present arrangement is the result of effort to overcome the spatial limitation. And also, through the instance of RC152, we reach a conclusion that not 1 kan but minimum 2 kan of original module is required to use "ㄱ" shaped work centers.
전처리 방법에 따라 화학적으로 가소화된 셀룰로오스의 합성 효율 향상에 대한 연구
김연희 ( Yeon Hee Kim ),남병욱 ( Byeong Uk Nam ),김해리 ( Hae Ri Kim ) 한국공업화학회 2013 응용화학 Vol.17 No.1
Cellulose is one of abundant resource on earth and referred to as "Biomass". It is biodegradable and renewable resource of the future because petroleum-based plastics can be replaced by cellulose. However, neat cellulose has not good reactivity because of strong hydrogen bond. In this study, to make better reactivity of cellulose, cellulose was pretreated such as sonication and water activation. Neat cellulose was dissolved in lithium chloride/N,N-dimethylacetamide (LiCl/DMAc) system. Fatty acid and acetic anhydride was used to prepare cellulose mixed ester. Reaction was run in 8 h at 120℃. Pretreated cellulose was studied using Field emission scanning electron microscopy (FE-SEM), Fourier transform infrared (FT-IR) and thermogravimetric analysis (TGA). The results showed improvement of synthesis efficiency through morphology, structure and thermal properties of pretreated cellulose.
플라즈마 DLC 증착법을 이용한 실리콘 표면의 친수성 유지
이진우(Jin Woo Yi),문명운(Myoung-Woon Moon),이광렬(Kwang-Ryeol Lee),김해리(Hae-Ri Kim),김성진(Seong Jin Kim),차태곤(Tae-Gon Cha),김호영(Ho-Young Kim) 대한기계학회 2009 대한기계학회 춘추학술대회 Vol.2009 No.5
Aging behavior of wettability of Si-DLC (Si incorporated diamond-like carbon) films treated by various gas (H₂, O₂, and N₂) plasma was investigated. We found that the initially low contact angle of most plasma-treated Si-DLC surfaces recovered its high value (near 90°) within few days. However, the contact angle of Si-DLC with the Si weight fraction of 1.24 and 2.66% was measured to be below 10° as-modified, and maintained its value below 15° for 20 days. XPS analysis reveals that the polar components of Si-O bonds, enhancing hydrophilicity, have been almost unchanged over 20 days on the Si-DLC modified with oxygen plasma. Further explanation for this superior durability of the superhydrophilicity comes from observing the surface morphology evolution due to oxygen plasma treatment: nano-pillar-like structures develop on Si-DLC with the Si weight fraction of 1.24 and 2.66% due to oxygen plasma while no surface structure change is observed on films with other Si fractions.