리세스 길이가 다른 동축 와류형 분사기들에 대한 수치해석

이봄,윤원재,윤영빈,안규복,Lee, Bom,Yoon, Wonjae,Yoon, Youngbin,Ahn, Kyubok 한국분무공학회 2018 한국액체미립화학회지 Vol.23 No.2

Numerical study under single-injection on bi-swirl coaxial injectors with different recess lengths was performed using ANSYS Fluent. The bi-swirl coaxial injectors which consisted of inner closed-type and outer open-type swirl injectors, had three different recess lengths. By changing mass flow rates, numerical simulation was repeated using the Reynolds stress BSL turbulent model. The numerical results such as discharge coefficient and spray angle were compared with previous experimental data and were found to be approximately matched well with them, irrespective of recess length. Quantitative data which was hard to be measured from experiments, were successfully obtained through the present numerical study.

Binodal, Wireless Epidermal Electronic Systems with In-Sensor Analytics for Neonatal Intensive Care

이봄,김봉훈 한국고분자학회 2020 한국고분자학회 학술대회 연구논문 초록집 Vol.45 No.2

음악요법과 정보제공이 위내시경 대상자의 불안과 불편감 감소에 미치는 영향

이봄,고춘희,박민선,박선희,김순희 병원간호사회 2003 임상간호연구 Vol.8 No.2

This study was attempted to provide for an effective nursing intervention by verifying the effects of information provision and musical treatment for patients subject to the gastric endoscope method. The research period was from 7th of May, 2001 to 7th of July, 2001 in the department of internal medicine at a general hospital in Ulsan. Those who were selected as the subjects to this study were qualified patients of the selection standard desiring to get an endoscopy and 30 patients were divided each to experiment group A, experiment group B and control group respectively for a total of 90 patients. This experiment design is similar to the non-equivalent control group order method. Information provision consisted of sense information and procedure information and a music tape was used for the musical treatment. Spielberger temperament anxiety tool and VAS measuring tool for anxiety was used and the indications for energy was measured before and after the musical treatment. The subjective discomfort values of the subject and the objective discomfort behavior values were used. The analysis of the data was done by SPSS WIN and homogeneity of the experimental and control groups were done through the x^(2)-test and the hypothesis was verified with ANOVA. The results are as follows. 1) Hypothesis 1 : The hypothesis "experimental group exposed only to the musical treatment, experimental group exposed to both the information provision and musical treatment and the control group will each have different values for anxiety values?" was supported(p<.00). 2) Hypothesis 2 : The hypothesis "experimental group exposed only to musical treatment, experimental group exposed to both the information provision and musical treatment and the control group will each show different readings in the blood pressures for contraction and relaxation?" was partially supported because there was only a significant difference in the relaxation blood pressure and little difference was shown in the contraction blood pressure(Blood Pressure during contraction : F=1.40, p<.25, Blood Pressure during relaxation : F=4.61, p<.01). 3) Hypothesis 3 : The hypothesis "experimental group exposed only to musical treatment, experimental group exposed to both the information provision and musical treatment and the control group will each show different heart pulses?" was supported by having all three groups show significant differences with each other(F=7.62, p<.00). 4) Hypothesis 4 : The hypothesis "experimental group exposed only to musical treatment, experimental group exposed to both the information provision and musical treatment and the control group will each show different subjective discomfort values?" was supported by the significant levels of difference in tension(F=14.25, p<.00), pain(F=5.36, p<.00), chills(F=9.56, p<.00), and difficult breathing(F=14.47, p<.00). 5) Hypothesis 5 : The hypothesis "experimental group exposed only to musical treatment, experimental group exposed to both the information provision and musical treatment, and the control group will each show different readings for objective discomfort behavior value during endoscopy?" was supported by having significant differences in the level of chills(F=6.62, p<.00), changes of vocal sound(F=8.54, p<.00), facial changes(F=16.65, p<.00), and in bodily changes(F=22.75, p<.00). Based on the conclusion of the study, the following is proposed 1. Because there are almost no experimental research that paralleled information provision and musical treatment, it is suggested that a research of the exactly the same design be conducted again. 2. There needs to be more systematic research regarding elements that can provide anxiety and discomfort to the patients of the endoscope method and a repetitious research study needs to be conducted based on the homogeneity after confirmation of such.

유연한 유기태양전지의 수분 투습 방지를 위해 원자층 증착법으로 제조된 Al2O3 박막에 대한 연구

이봄,임주현,권도윤,오영택,김시몬,신진용,임회연,이수언,김승희,김봉훈 한국섬유공학회 2020 한국섬유공학회지 Vol.57 No.6

A moisture barrier layer with high density and uniformity is essential forincreasing the lifespan of optoelectronic devices such as flexible organic solar cells, LEDs,and photodetectors. In this study, various surface pre-treatments (O2 plasma, UVOtreatment, Al seed layer, and thermal annealing process) were performed on a polyethylenenaphthalate (PEN) film to form a functional group of chemical adsorption with the atomiclayer deposition (ALD) precursor. We investigated the effect of the surface pre-treatment ofa PEN substrate for a deposition of Al2O3 thin film in terms of the deposition uniformity andwater vapor transmittance rate (WVTR). For example, the root mean square roughness ofthe bare PEN film/Al2O3 was RRMS=3.26 nm, whereas the O2 plasma treated PEN film/Al2O3had RRMS=0.99 nm because of the presence of a functional group. As a result, WVTR of barePEN film/Al2O3 was 0.83 g/m²/day, whereas that of O2 plasma treated PEN film/Al2O3decreased to 0.38 g/m²/day.

풀꽃

이봄 고요아침 2019 한국동시조 Vol.- No.14

Successful Retrieval of Fractured Vena Cava Filter (OptEase) in Situ at 60 Days after Installation

이봄,김진업,정해민,박상민,홍경순,최경찬 대한내과학회 2017 대한내과학회 추계학술대회 Vol.2017 No.1

Oleuropein reduces anxiety-like responses by activating of serotonergic and neuropeptide Y (NPY)-ergic systems in a rat model of post-traumatic stress disorder

이봄비,심인섭,이혜정,함대현 한국통합생물학회 2018 Animal cells and systems Vol.22 No.2

Post-traumatic stress disorder (PTSD) is a stress-related mental disorder caused by traumatic experiences. This psychopathological response to traumatic stressors induces anxiety in rats. Oleuropein (OLE), a major compound in olive leaves, reportedly possesses several pharmacological properties, including anti-cancer, anti-diabetic, and anti-atherosclerotic and neuropsychiatric activities. However, the anxiolytic-like effects of OLE and its mechanism of action in PTSD are unclear. The present study used several behavioral tests to examine the effects of OLE on symptoms of anxiety in rats after a single prolonged stress (SPS) exposure by inhibiting the hypothalamic-pituitary-adrenal axis. Male Sprague Dawley rats received OLE (10, 50 and 70 mg/kg, i.p., once daily) for 14 days after SPS exposure. Daily OLE (70 mg/kg) administration significantly increased the number and duration of open arm visits in the elevated plus maze (EPM) test, reduced the anxiety index and grooming behavior in the EPM test, and increased the time spent and number of central zone crossings in the open field test. OLE also blocked the SPS-induced decrease in hippocampal serotonin and neuropeptide Y expression in hippocampus. These findings suggest that OLE has anxiolytic-like effects on behavioral and biochemical symptoms similar to those observed in patients with PTSD.

말단캡핑제를 이용한 폴리카보네이트의 분자량 특성 조절

이봄이(Lee, Bom Yi),김연철(Kim, Youn-Cheol) 한국산학기술학회 2013 한국산학기술학회논문지 Vol.14 No.3

말단캡핑제(end capping agent) 6종류에 대해 폴리카보네이트를 용융중합법으로 제조하였다. 합성된 폴리카보 네이트의 화학구조는 FT-IR 스펙트럼을 이용하여 확인하였다. 평균분자량 및 분자량분포도, 유리전이 온도 및 열분해 온도는 GPC, DSC와 TGA를 이용하여 측정하였다. 말단캡핑제의 화학구조에 따라 평균분자량이 증가 또는 감소를 나 타내었으며, 말단캡핑제로 4-tert-butylphenol (TBP)이 사용되었을 때 최적의 분자량 조절 결과를 나타내었다. 말단캡핑 제의 함량이 증가할수록 평균분자량은 감소하였고, 4-tert-butylphenol이 0.05 - 0.1 mol%가 첨가될 때 폴리카보네이트 의 대형 사출물 가공에 적합한 20,000 - 30,000 정도의 수평균분자량을 나타내었다. 폴리카보네이트의 용융점도와 유 리전이온도는 분자량이 감소할수록 감소하였다. 말단캡핑제의 투입방법 변경은 PC의 분자량분포도에 영향을 주었고, power law index의 감소를 보여주었다. Polycarbonates (PCs) with six different end capping agents were synthesized from melt polymerization. Chemical structure of the synthesized PC was determined by FT-IR spectroscopy. The average molecular weight and distribution, glass transition and thermal degradation temperatures were determined by GPC, DSC and TGA. Average molecular weight changed with the chemical structure of end capping agent, and 4-tert-butylphenol was estimated as the optimum end capping agent. The average molecular weights of PCs decreased with the concentration of the agent, the number average molecular weight was observed as 20,000 - 30,000 when 0.05– 0.15 mol% of 4-tert-butylphenol added in PCs. The melt viscosities and glass transition temperature of the PCs decreased with molecular weight. The change for adding method of the agent affected on both the molecular weight distribution and decrease in power law index.

나일론66/유리섬유 복합체의 압출횟수에 따른 특성 연구

이봄이(Lee, Bom Yi),김연철(Kim, Youn-Cheol) 한국산학기술학회 2014 한국산학기술학회논문지 Vol.15 No.6

나일론66/유리섬유 복합체의 경우 300 ℃ 이상의 고온에서 사출가공 될 때 물성 저하가 일어날 수 있어, 재이용시 열이력에 대한 체계적인 연구가 필요하다. 305/290/273/268/265/260 ℃ 온도조건의 이축압출기(twin screw extruder)를 이용 하여 나일론66/유리섬유 복합체의 압출시료를 압출횟수에 따라 제조하였다. 압출횟수에 따른 화학구조, 열적특성, 용융지수, 결정구조, 아이조드 충격강도 및 유변학적 특성을 FT-IR, 용융지수 측정기, DSC, TGA, XRD, Izod 시험기, 그리고 유변물성 측정기를 이용하여 분석하였다. 적외선분광 스펙트럼을 이용하여 확인한 결과 압출횟수에 따른 압출시편에서의 화학구조 변화는 확인되지 않았다. 압출횟수에 따라 분자량이 감소하는 것을 용융지수와 복소점도를 이용하여 확인하였다. 나일론66/ 유리섬유 복합체의 용융온도는 큰 변화가 없으나, 압출횟수 증가에 따라 분해온도가 20 ℃ 정도까지 감소하는 것을 DSC와 TGA를 이용하여 확인하였다. 압출시편의 아이조드 충격강도는 압출횟수가 증가함에 따라 감소하였다. 또한 나일론66/유리 섬유 복합체 압출시편의 G'-G" 곡선의 기울기나 형태가 변하지 않는 것으로부터 압출시편에 가교와 같은 구조변화가 크게 나타나지 않음을 알 수 있었다. Because the physical properties can be decreased when a Nylon 66/glass fiber composite is injected into a mold over 300 ℃, a systematic study of the thermal history in the case of re-use is needed. Nylon 66/glass fiber extrudates as a function of the extrusion number were prepared using a twin screw extruder at 305/290/273/268/265/260 ℃. The chemical structure, thermal properties, melt index, crystal structure, Izod impact strength, and rheological properties were measured by Fourier transform infra-red (FT-IR), melt indexer, DSC, TGA, XRD, Izod impact tester, and dynamic rheometer. The FT-IR spectra indicated that the number of extrusions did not affect the chemical structure. The decrease in molecular weight with increasing extrusion number was confirmed by the melt index and the complex viscosity of extrudates. Based on the DSC and TGA results, the thermal history had no effect on the melting temperature, regardless of the number of extrusions, but the degradation temperature decreased up to 20 ℃ with increasing extrusion number. The Izod impact strengths of the extrudates were found to decrease with increasing extrusion number. No structural change after extrusion was also confirmed because there was no change in the slope and shape of the G'-G" plot.

Research advances in treatment of neurological and psychological diseases by acupuncture at the Acupuncture Meridian Science Research Center

이봄비,김승남,박히준,이혜정 한국한의학연구원 2014 Integrative Medicine Research Vol.3 No.2

Acupuncture is an ancient therapeutic intervention that can be traced back at least 2100 years and is emerging worldwide as one of the most widely used therapies in the field of complementary and alternative medicine. Due to limitations associated with Western medicine's focus on the treatment of diseases rather than on their causes, interests are shifting to complementary and alternative medicines. The Acupuncture and Meridian Science Research Center (AMSRC) was established in 2005 to elucidate the neurophysiological mechanisms of acupuncture for neurological diseases based on multidisciplinary research supported by the Korean Ministry of Science and Technology. In the AMSRC, resultant research articles have shown that acupuncture can improve neurological and psychological problems, including Parkinson's disease, pain, and depression, in animal models. Basic research studies suggest its effectiveness in treating various problems such as depression, drug addiction, epilepsy, ischemia, dementia, Parkinson's disease, and pain. We strongly believe that these effects, evident from the AMSRC research results, can play leading roles in the use of acupuncture for treating neurological diseases, based on collaboration among various academic fields such as neurophysiology, molecular genetics, and traditional Korean medicine.