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이시영, 이재만, 양뢰, 천현우 배재대학교 자연과학연구소 2013 自然科學論文集 Vol.24 No.1
This study is aimed to find ways to analyze the current nighttime use of mountainside Mt.Bomunsan Park and thereby, to increase the efficiency of mountainside parks situated in urban areas, by case-studying other similar parks whose nighttime use has been facilitated. Also, the study focused on identifying diverse leisure activities for urban citizens to enjoy at night at such parks. First, the Mt.Boumunsan Park area was analyzed in its current nighttime use, space by space, to learn how the park is used by the public at night. Second, other parks whose physical environment is similar to that of Mt.Boumunsan Park were case-studied so that the result could be reflected on the operation of Mt.Boumunsan Park. Third, revitalization suggestions were made for the visit to Mt.Boumunsan Park during nighttime so that they can be referred to as basic data when planning and designing a park in the future for more efficient spacing. It is anticipated that when planning and designing is under consideration to improve Mt.Boumunsan Park, it is better to devise, after taking into account the local government's financial status and the public opinions, a short-and mid-term plan will better serve citizens than a non-feasible long-term master plan.
Effect of Grain Boundary Phase on Contact Damage Resistance of Silicon Nitride Ceramics
Lee, Chul Seung,Lee, Kee Sung,Lee, Shi Woo,Kim, Do Kyung Trans Tech Publications, Ltd. 2005 Key Engineering Materials Vol.287 No.-
<P>Contact damage resistances of silicon nitride ceramics with various grain boundary phases are investigated in this study. The grain boundary phases are controlled by the addition of different types of sintering additives, or the crystallization of intergranular phase in a silicon nitride. We control the microstructures of materials to have similar grain sizes and the same phases to each other. Contact testing with spherical indenters is used to characterize the damage response. The implication is that the grain boundary phase can be another controllable factor against contact damage and strength degradation even though it is not critical relative to the effect of grain morphology.</P>
Woo Hyung Lee,Hyun Kyung Do, Joong Hoon Lee,Bo Ram Kim,Jee Hyun Noh,Soo Hyun Choi,Sun Gun Chung,Shi-Uk Lee,최지은,Seihee Kim,Min Jee Kim,Jae-Young Lim 대한재활의학회 2016 Annals of Rehabilitation Medicine Vol.40 No.2
Objective To compare the clinical outcomes following conservative treatment and arthroscopic repair in patients with a rotator cuff tear.Methods In this retrospective study, patients aged >50 years with a symptomatic rotator cuff tear were reviewed. The rotator cuff tendons were evaluated using ultrasonography, shoulder magnetic resonance imaging or MR arthrography, and the patients with either a high-grade partial-thickness or small-to-medium-sized (≤3 cm) full-thickness tear were included in this study. The primary outcome measures were a pain assessment score and range of motion (ROM) at 1-year follow-up. The secondary outcomes were the rate of tear progression or retear along with the rate of symptom aggravation after the treatments.Results A total of 357 patients were enrolled, including 183 patients that received conservative treatment and 174 patients who received an arthroscopic repair. The pain assessment score (p<0.001) and the ROM in forward flexion (p<0.001) were significantly improved in both groups. The ROM in internal rotation did not significantly change after conservative treatment and arthroscopic repair. The pain assessment score and ROM were not significantly different between the two groups. Retear was observed in 9.6% of patients who had an arthroscopic repair and tear progression was found in 6.7% of those who underwent conservative treatment. The proportion of aggravation for pain and ROM did not significantly differ between the two groups.Conclusion The effectiveness of conservative treatment is not inferior to arthroscopic repair for patients >50 years old with a less than medium-sized rotator cuff tear in a 1-year follow-up period. Further study is warranted to find the optimal combination of conservative treatment for a symptomatic rotator cuff tear.
형상이 제어된 골 조직 재생용 3차원 지지체를 적용한 새로운 형태의 Perfusion Culture
이시우 ( Shi Woo Lee ),허수진 ( Su Jin Heo ),장지연 ( Ji Yeon Jang ),정재영 ( Jae Young Jeong ),김수향 ( Su Hyang Kim ),박수아 ( Su A Park ),전은수 ( Eun Su Jeon ),신정욱 ( Jung Woog Shin ) 한국조직공학·재생의학회 2010 조직공학과 재생의학 Vol.7 No.1
The objective of this study was to investigate the efficacy of a newly designed perfusion bioreactor which provides flow-induced mechanical stimulation on the cells residing in the intra-morphology controllable scaffolds. For this, we fabricated scaffolds composed of poly e-caprolactone (PCL) and micro-sized hydroxyapatite (HA) particles using rapid-prototyping process. Also a new bioreactor system for perfusion culture was designed and developed. For the analyses of cellular responses of bone-tissue related cells cultured in the perfusion bioreactor system, various biological assays were performed such as MTT test, DNA content measurement, FE-SEM and live/dead staining. The cells used in this study were MG-63 (human osteoblast-like cell line) and mesenchymal stem cells from New Zealand white rabbits. Our results showed that the cells cultured by the perfusion bioreactor resulted in higher proliferation rate and mineralization of extracellular matrices than those cultured in static culture. From this study, we could confirm the potentials of 1) a newly developed perfusion bioreactor, 2) intra-morphology controllable scaffolds composed of PCL and HA particle and 3) the combination of the suggested scaffolds and perfusion culturing system in relation to bone tissue engineering.
빛 공해 방지를 위한 유럽형 LED 가로등용 비구면 광학계에 관한 연구
이시우(Shi-Woo Lee),이창수(Chang-Soo Lee),현동훈(Dong-Hoon Hyun) 한국생산제조학회 2013 한국생산제조학회지 Vol.22 No.3
In this study, we researched a pendant-type aspherical optical system, which could be applied to street lighting and security lighting in Europe. The goal of this research was eco-friendly artificial lighting that could be used for the one-to-one replacement of ordinary lighting. LED lighting was miniaturized by using one COB LED Module and one aspherical optical system, which could control the luminosity of the LED. Through the aspherical optical system, the light distribution angle could be controlled in a range of 140° for the X-axis and 40° for the Y-axis. This means that this optical system is appropriate for catenary-type lighting, which is widely used in Europe on both narrow and broad roads. The performance was determined using a lighting simulation program. This lighting system simulation showed that road rates M4 and M5 could be satisfied, with the condition of a 13-m height and 50-m distance (U0 and TI). The simulation program estimated that light pollution, which disturbs sleep, could beeliminated in the European streetlight case. Determining methods for the light distribution control, performance, and optimal lighting setup conditions is very important to prevent light pollution. Moreover, the initial step of developing the lighting system design and post management will require an effort with much analysis.
혈관 내 미세 유체환경에서 혈관 내피 세포와 공배양된 중간엽 줄기세포의 특성 관찰
이시우 ( Shi Woo Lee ),장지연 ( Ji Yeon Jang ),박소희 ( So Hee Park ),김동화 ( Dong Hwa Kim ),신지원 ( Ji Won Shin ),김수향 ( Su Hyang Kim ),신정욱 ( Jung Woog Shin ) 한국조직공학과 재생의학회 2010 조직공학과 재생의학 Vol.7 No.2
In this study we investigated the effects of biochemical reagents, direct co-culturing as well as flowinduced shear stress on the differentiation of MSCs into vascular cell lineages. To investigate the effects of growth factors on the differentiation of MSCs, medium with/without growth factors were used. To induce shear stress by fluid-flow on the cells, miniature flow cell chips were fabricated using polydimethylsiloxane. For the co-cultures, MSCs were mixed with HUVECs in the ratio of 1:2. 48h after the seeding, the shear stress was imposed on the cells. The flow rate was adjusted to have the shear stress as 10 dyne/cm2. Immunofluorescence stainings for α-smooth muscle actin (α-SMA) and von Willebrand factor (vWF) were performed. Acquired stained samples from a confocal microscope were analyzed by image processing. Any expressions of vascular specific markers were not shown in MSCs co-cultured with HUVECs when growth factors were not added. The expressions of α-SMA were observed in MSCs co-cultured with growth factor under static culture on day 4, but these were remarkably decreased on day 7. The expressions of α-SMA in MSCs co-cultured under shear stress were increased regardless of the growth factor. The highest expression of α-SMA was observed in MSCs co-cultured with flow-induced shear stress. The expressions of vWF were not observed in MSCs in all groups. In summary, we have shown that coculturing of MSCs and HUVECs under shear stressing, which mimics micro-environments, could help MSCs differentiate toward smooth muscle like cells.