화학물질 관리에 대한 이해 54 - 공정안전관리(PSM) 제도의 현황 및 개선방안

이주엽,Lee, Ju-Yeop 대한산업보건협회 2015 산업보건 Vol.332 No.-

CESM 모델을 이용한 홀로세 중기 고기후 모의 연구

이주엽,홍제우,이준홍,김정원,홍진규 한국기상학회 2019 한국기상학회 학술대회 논문집 Vol.2019 No.10

형개(荊芥)가 조골세포(造骨細胞)에 미치는 영향(影響)

이주엽,황귀서,Lee, Joo-Yup,Hwang, Gwi-Seo 대한예방한의학회 2009 대한예방한의학회지 Vol.13 No.3

Objectives : The author aimed to evaluate the effect of BuOH fraction(ST) from Schizonepeta tenuifolia on osteoblast proliferation in murine calvarial cells. Methods : The osteoblast separated from murine calvariae was cultivated for 10 days and evaluated the cell function. After the addition of ST on the culture medium, we determined the effect of ST on the cell proliferation, protein synthesis, alkaline phosphatase activity, collagen synthesis, and apoptosis of the osteoblast. Results : 1. ST increased the proliferation of osteoblast, and restored the decreased cell number in glucocorticoid (GC)-treated osteoblast. 2. ST increased protein synthesis of osteoblast, and restored the decreased protein synthesis in GC-treated osteoblast. 3. ST increased ALP activity of osteoblast, and restored the decreased enzyme activity in GC-treated osteoblast. 4. ST increased collagen synthesis of osteoblast, and restored the decreased collagen synthesis in GC-treated osteoblast. 5. ST did not change the survival rate of osteoblast, but increased the survival rate in GC-treated osteoblast. Conclusions : It is concluded that ST might reduce the osteoporosis resulted from augumentation of osteoblast proliferation.

Buffalo Leather 코팅에 대한 수분산 폴리우레탄의 합성 및 3가 알콜 첨가에 의한 물성변화 연구

이주엽 한국유화학회 2015 한국응용과학기술학회지 Vol.32 No.4

Buffalo leather 표면 코팅에 사용된 폴리우레탄 수지에 glycerol의 함유를 mole % 비로 달리 하면서 첨가 하였다. 합성된 폴리우레탄 수지의 기계적 특성은 SEM, FT-IR, UTM 등을 이용하여 측정 하였다. 친환경적인 고분자 수지의 관심이 고조됨에 따라 용제의 사용을 최소화한 buffalo leather 코팅에 사용되는 수분산 수지를 합성하였다. 지방족 3가 알콜인 glycerol의 mole % 비가 증가함에 따라 내마모 도, 인장강도가 감소함을 알 수 있었다. 반대로 연신율, 내굴곡 물성은 증가함을 알 수 있었다. Toluene 을 이용한 내용제성 물성측정 결과에는 glycerol의 mole % 증가에 따른 물성 증감 효과는 없었다. Prepared polyurethane resin for buffalo leather coating on surface was synthesized with addition reaction glycerol which had different mole ratio. Mechanical properties of the synthesized polyurethane resin were measured by the SEM, FT-IR, UTM. Growing concerns in the evnironment-friendly polymer resin, we have synthesized low late obtained solvent water dispersion resin to be coating on buffalo leather. The increase of aliphatic trihydric alcohol glycerol mole %, abrasion resistance and tensile strength had demonstrated reduce properties. On the contrary, elongation and flexibility properties had highly increased. In the result of toluene solvent resistance, there was no effect of increased or decreased by the ratio of glycerol mole %.

녹색 사하라 식생 모의 시 질소 과정 및 토양 영향 분석

이주엽,홍진규,Martin Claussen,김정원,홍제우 한국기상학회 2021 한국기상학회 학술대회 논문집 Vol.2021 No.10

“녹색 사하라”로 알려진 8천 년 전 사하라 지역은 현재보다 온난하고 강수가 많았으며 식물이 광범위하게 존재하였다. 이는 현재와 다른 지구의 공전 궤도 효과와 함께, 식생-토양-강수의 복잡한 상호작용 결과로 알려져 있다. 따라서 녹색 사하라 시기의 식생 분포를 현실적으로 수치 모사하는 것은 지구시스템모델을 개선하고 기후 변화로 인한 생태계의 반응을 보다 잘 예측하기 위해서 중요하다. 하지만 현재까지 발달한 지구시스템모델링 기술에도 불구하고 현재의 모델들은 이러한 녹색 사하라의 강수와 식생을 여전히 잘 모의해내지 못하고 있다. 본 연구에서는 CESM (Community Earth System Model) 모델을 사용하여 녹색 사하라 시기의 강수와 식생을 모의하고, 토양의 생지화학 과정 및 물리적 특성이 녹색 사하라 시대의 식생 모사에 미치는 영향을 연구하였다. 본 연구 결과를 통하여 기후-식생-토양 사이의 상호작용에 대한 이해를 증진시킬 수 있었으며, 녹색 사하라 지역의 식생을 보다 현실적으로 수치 모사하기 위한 조건을 밝힐 수 있었다.

Lamb Leather용 Caster Oil 기반 수분산 바이오 폴리우레탄필름의 제조

이주엽 한국응용과학기술학회 2022 한국응용과학기술학회지 Vol.39 No.2

Unmodified castor oil (CO) was used to obtain a castor-based aqueous polyurethane (CPUD) and isophorone diisocyanate (IPDI) was used to obtain a transparent film. The mixing effect of polypropyleneglycole (PPG) was analyzed to increase flexibility. In addition, ethylenediamine (EDA) was used as a chain extender. Tensile strength, elongation, and abrasion resistance were measured according to the change according to the castor oil content and the change in the chain extender, respectively. The tensile strength of the sample containing a lot of castor oil was 1.112 kgf/㎟, and the elongation was 88%. The tensile strength of the sample containing a lot of chain extender was 3.33kgf/㎟, and the elongation was 99%. The surface strength was visually confirmed through SEM. The surface strength was visually confirmed through SEM. 피마자 기반 수성 폴리우레탄(CPUD)을 얻기 위해 무 변성 피마자유 (CO) 와 투명 필름을 얻기 위해 이소포론 디이소시아네이트(IPDI)를 사용했다. 유연성을 증가시키기 위해 폴리프로필렌글리콜 (PPG)의 혼합 효과를 분석하였다. 또한, 사슬연장제로 에틸렌다이아민(EDA)을 사용했다. 각각 피마자유 함유에 따른 변화와 사슬연장제 변화에 따른 인장강도, 연신율 내마모성을 측정했다. 피마자유 함유가 많은 시료의 인장강도가 1.112kg f /㎟, 연신율 88%로 나타났으며, 사슬연장제 함유가 많은 시료의 인장 강도가 3.33kg f /㎟, 연신율 99%로 측정되었다. 표면강도는 SEM을 통해 육안으로 확인하였다.

폴리인산 암모늄과 HMDI 기반으로 제조된 수분산 폴리우레탄 수지의 물리적 특성 연구

이주엽 한국응용과학기술학회 2020 한국응용과학기술학회지 Vol.37 No.6

본 연구에서는 폴리인산암모늄 인산염과 HMDI로 합성된 수분산 폴리우레탄수지의 물리적 특성을 필름 시료와 피혁(Full-Grain) 표면에 코팅을 하여 물리적 특성 변화를 연구하였다. 내용제성은 모든 시료에서 변확 없음을 확인 할수 있었으며, 인장강도의 경우 폴리인산암모늄이 가장 많이 함유된 DPU-AP3(1.887 kg f /㎟)가 가장 낮은 물성을 보였다. 연실율은 폴리인산암모늄 많이 함유된 시료가 548%로 측정되었다. 내마모성은 폴리인산암모늄이 많이 함유된 시료가 548 ㎎.loss로 측정되어 폴리인산 암모늄과 수분산 폴리우레탄의 블랜딩된 수지의 물성변화가 확인되었다. In this study, the physical properties of water-dispersible polyurethane resins synthesized with polyammonium phosphate and HMDI were studied by coating film samples and full-grain surfaces. Solvent resistance was found to be unchanged in all samples, and in terms of tensile strength, DPU-AP3 (1.887 kgf/㎟) containing the most ammonium polyphosphate showed the lowest physical properties. The elongation rate was measured as 54 8% in the sample containing a large amount of ammonium polyphosphate. Abrasion resistance was measured as 548 mg.loss of a sample containing a lot of ammonium polyphosphate, and it was confirmed that the physical properties of the blended resin of ammonium polyphosphate and water-dispersible polyurethane were changed.

한국어 DASH version의 신뢰도와 타당성

이주엽,임재영,정진영 대한견주관절의학회 2005 대한견주관절학회 학술대회논문집 Vol.2005 No.5

더 나은 배관설비를 위하여: 베케트 후기 작품에 나타난 King Lear에 대한 문학적 암시 이

이주엽 한국현대영미드라마학회 2022 현대영미드라마 Vol.35 No.1

This paper tries to understand the nature of Beckett’s literary allusion by way of analyzing the literary allusions to King Lear appearing in his later English texts. King Lear and Beckett’s works bear similarities in terms of the theme of the failure of divine reward, the experiment in human misery and sufferings and the element of the grotesque pantomime. As a frame of reference for our study, there are three major case studies on Beckett’s literary allusions respectively undertaken by Gontarski, Knowlson and Caselli, which respectively shed light on the echoes in the mythical patterns, the generality of quotation and its sensory embodiment and the self-reflective and ironical intertextuality. As this paper analyzes Ill Seen Ill Said, Worstward Ho and Endgame as the three representative cases of Beckett’s literary allusion to King Lear, Ill Seen Ill Said’s quotation of “vile jelly” is, firstly, found to create profound thematic echoes between the fruitless efforts of its camera-eye and those of Gloucester in King Lear. In terms of the general quotation and its sensory embodiment, the text echoes the senility dramatized in King Lear by materializing the frailty of the one frail remaining eye and the abject body of the old woman. The case of ironical intertextuality in the work is performed in the way in which, the better one understands King Lear, the better one can understands the work in allusion to it itself, as a subtle device in the text bringing about the inversion between origin and product. Worstward Ho sets Edgar’s line “the worst is not so long as we can say ‘This is the worst’” as a very important preoccupation as well as the most important thematic thread in the work. Endgame illustrates similarities to, and influences from, King Lear in its ethos and pathos. Peter Brook’s iconic 1962 production King Lear so effectively witnessed to and exploited those similarities as to alter the general interpretation as well as the critical opinion of the Shakespearean original. As Beckett himself explained, these literary allusions are like “bits of pipe” that he carefully and meticulously chose for a better working literary construction.

Evaluation of Physical Properties of Polyurethane Resin for Wound Covering according to PTMG, DMBA Application

이주엽 한국응용과학기술학회 2020 한국응용과학기술학회지 Vol.37 No.5

In this study, the polyurethane resin was synthesized by applying PTMG and DMBA of different composition ratios for the synthesis of water-dispersible polyurethane used in wound coating resin. The varying properties of the synthesized water-dispersible polyurethane were measured through tensile strength, elongation, and abrasion resistance analysis. As for the tensile strength measurement result according to the PTMG content, the sample with the highest reaction molar ratio was measured as 1.08 kgf/mm2 and the elongation was measured as 520%. As for the tensile strength result according to the DMBA content, the sample with the highest reaction molar ratio was measured as 0.51 kgf/mm2, and the elongation was measured as 435%. The degree of surface destruction by the abrasion resistance measurement was visually confirmed through SEM.