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영상 감시 시스템에서의 개선된 Tearing 현상 방지 디스플레이 시스템
이동학,정연권,정선태 崇實大學校 生産技術硏究所 2001 論文集 Vol.31 No.-
In display systems employing an analog monitor, the tearing artifact such that an window screen is divided into two parts showing different scenes can occur when the change of scenes in the moving pictures is very fast, but the frame buffer's refresh rate does not match the monitor's scanning frequency. In the DVR system, a recently popularized visual monitoring system, the tearing artifacts becomes more serious since the frame buffer's refresh rate is vey high due to the requirement of multi-channel display. In this paper, we propose an improved display system for windows-based DVR systems which prevents the tearing artifacts without daterioration of display speed perfromance. The efficiency of the proposed display system is verfied through experiments.
일식과 월식에 대한 교과서와 상위·하위집단 학생의 언어네트워크 비교
정동권 ( Dong-gwon Jeong ),연유상 ( Yu Sang Yeon ) 한국현장과학교육학회 2021 현장과학교육 Vol.15 No.1
본 연구는 일식과 월식에 대한 교과서와 상위집단, 하위집단 학생의 개념구조를 언어네트워크로 비교하여 어떠한 차이가 있는지 알아보는 것에 목적이 있다. 이를 위해 2015 개정 교육과정에 따라 일식과 월식에 대해 다루고 있는 중학교 2학년 교과서 5종과 집단별 학생 8명을 대상으로 분석하였다. 교과서와 상위집단, 하위집단 모두 달, 태양, 지구가 네트워크 중심에 위치하는 공통적 특성을 보였으며 특히 달의 빈도수와 연결정도가 높게 나타났다. 단, 집단별 언어네트워크에서는 그림자, 본그림자와 반그림자를 식 현상과 관련 짓는 데 다소 차이가 있었다. 교과서와 집단별 용어에 대해 위세중심성을 분석한 결과 교과서는 빛과 그림자 용어에 대해 낮은 위세를 갖는 반면, 학생들은 이에 대해 높은 위세중심성을 나타냈다. 또한 천체의 위치와 배열에 관한 용어에 대해 교과서와 하위집단은 낮은 위세를 보였으나, 상위 집단에서만 높은 위세중심성을 나타냈다. 교사는 이러한 차이를 고려하여 식 현상에 대한 학생들의 개념형성을 조력할 수 있다는 것에 의미가 있다. The purpose of this study is to compare textbooks on solar eclipse and lunar eclipse with the conceptual structure of students in upper and lower groups by using semantic networks to find out what differences are there. For this, based on the 2015 science curriculum, 5 textbooks for 2nd grade middle school students dealing with solar and lunar eclipses were targeted, and 8 students per group were analyzed. The textbooks, the higher group, and the lower group all showed common characteristics in that the moon, sun, and earth were located at the center of the network, and the frequency and degree of connection of the moon were particularly high. However, in the concept networks of each group, there were some differences in relating shadows, umbra and penumbra to the eclipse. As a result of analyzing textbooks and concepts of each group, textbooks have a low influence on the concepts of light and shadow, while students have a high influence on them. In addition, textbooks and lower group showed low eigenvector centrality for the concept of the location and arrangement of celestial bodies, but only the higher group showed high eigenvector centrality. It is meaningful that teachers can help students form concepts about eclipse considering these following differences.
Gwon, Do Hyeong,Hwang, Tae Woong,Ro, Ju-Ye,Kang, Yoon-Joong,Jeong, Jin Young,Kim, Do-Kyung,Lim, Kyu,Kim, Dong Woon,Choi, Dae Eun,Kim, Jwa-Jin MDPI 2017 INTERNATIONAL JOURNAL OF MOLECULAR SCIENCES Vol.18 No.10
<P>Regulated autophagy is involved in the repair of renal ischemia-reperfusion injury (IRI). Fat-1 transgenic mice produce ω3-Polyunsaturated fatty acids (ω3-PUFAs) from ω6-Polyunsaturated fatty acids (ω6-PUFAs) without a dietary ω3-PUFAs supplement, leading to a high accumulation of omega-3 in various tissues. ω3-PUFAs show protective effects against various renal injuries and it has recently been reported that ω3-PUFAs regulate autophagy. We assessed whether ω3-PUFAs attenuated IR-induced acute kidney injury (AKI) and evaluated its associated mechanisms. C57Bl/6 background fat-1 mice and wild-type mice (wt) were divided into four groups: wt sham (<I>n</I> = 10), fat-1 sham (<I>n</I> = 10), wt IRI (reperfusion 35 min after clamping both the renal artery and vein; <I>n</I> = 15), and fat-1 IRI (<I>n</I> = 15). Kidneys and blood were harvested 24 h after IRI and renal histological and molecular data were collected. The kidneys of fat-1 mice showed better renal cell survival, renal function, and pathological damage than those of wt mice after IRI. In addition, fat-1 mice showed less oxidative stress and autophagy impairment; greater amounts of microtubule-associated protein 1A/1B-light chain 3 (LC3)-II, Beclin-1, and Atg7; lower amounts of p62; and, higher levels of renal cathepsin D and ATP6E than wt kidneys. They also showed more adenosine monophosphate-activated protein kinase (AMPK) activation, which resulted in the inhibition of phosphorylation of the mammalian target of rapamycin (mTOR). Collectively, ω3-PUFAs in fat-1 mice contributed to AMPK mediated autophagy activation, leading to a renoprotective response.</P>
Jeong-Heon Choi,Shin Hwang,Young-Joo Lee,Ki-Hun Kim,Gi-Young Ko,Dong Il Gwon,Chul-Soo Ahn,Deok-Bog Moon,Tae-Yong Ha,Gi-Won Song,Dong-Hwan Jung,Sung-Gyu Lee 한국간담췌외과학회 2015 한국간담췌외과학회지 Vol.19 No.2
Backgrounds/Aims: Both preoperative transcatheter arterial chemoembolization (TACE) alone and portal vein embolization (PVE) alone have a detrimental prognostic effect on the post-resection outcomes in patients with hepatocellular carcinoma (HCC). The main objective of this study was to assess the prognostic impact of preoperative TACE on the long-term survival outcomes in patients undergoing preoperative PVE and right liver resection for solitary HCC. Methods: Patients who underwent macroscopic curative right liver resection of solitary HCC that lied between 3.0 and 7.0 cm (n=113) with or without preoperative TACE and PVE were selected for the study, making these subjects were divided into three groups; the TACE-PVE group (n=27), the PVE-alone group (n=13), and the control group (n=73). The subjects in the three groups were followed up for ≥36 months or until death. Results: The 1-, 3-, 5-, and 10-year overall patient survival rates of all 113 patients were 96.5%, 88.2%, 81.3% and 65.0%, respectively. The 1-, 3-, 5-, and 10-year overall patient survival rates were 96.3%, 83.4%, 83.4% and 47.6% respectively in the TACE-PVE group; 84.6%, 76.9%, 57.7% and 19.2% respectively in the PVE-alone group; and 98.6%, 91.7%, 85.1% and 81.7% respectively in the control group (p=0.047). Patients were also sub-grouped according to tumor size, and those with a tumor of up to cutoff at 5 cm showed no prognostic difference (p=0.774), but tumor size >5 cm was associated with inferior patient survival only in the TACE-PVE group (p=0.018). Conclusions: Preoperative sequential TACE and PVE appear to be compliant to the conventional oncological concept in addition to induction of the future remnant liver regeneration. Therefore, we suggest that preoperative TACE should be come first whenever preoperative PVE for major hepatectomy is planned, especially in patients with hypervascular HCC tumors.
포스터 전시회 : 나노 유체 증발에 따른 젖음성 변화 및 입자의 국부 응집 특성
신동환 ( Dong Hwan Shin ),권혁록 ( Hyuk Rok Gwon ),이진운 ( Jin Woon Lee ),( Jae Bin Lee ),정찬호 ( Chan Ho Jeong ),김종민 ( Jong Min Kim ),유홍선 ( Hong Sun Ryou ),이성혁 ( Seong Hyuk Lee ) 한국액체미립화학회 2012 한국액체미립화학회 학술강연회 논문집 Vol.2012 No.-
This study investigates experimentally evaporation characteristics of nanofluids droplets containing 50 nm alumina (Al2O3) particles and the wettability changes on a hydrophilic glass surfaces. From the captured digital images by using a CMOS camera and a magnifying lens, we examined the effect of particle concentration on droplet evaporation rate which can be indirectly deduced from the measured the droplet volumes varying with time as well as the total evaporation time. It was found that as the volume fraction of nanofluids increased, the total evaporation time and the initial contact angles decreased, while the droplet perimeters increased. In order to figure out the cause of results, the present study visualized the triple line of the droplet to study the wetting dynamics at the initial state with the use of a digital image analysis technique. Moreover, with the inverted microscope, the spatial non-uniformity was observed in the nanofluids droplet, it should be considered to analyze the heat transfer inside the droplet.
해양성 Marinomonas sp. SH-2 균주가 생성하는 agarase의 분리 및 특성조사
조정권(Jeong-Gwon Jo),이솔지(Sol-Ji Lee),이동근(Dong-Geun Lee),이상현(Sang-Hyeon Lee) 한국생명과학회 2016 생명과학회지 Vol.26 No.2
본 연구에서는 많은 생리활성 기능을 갖는 한천올리고당과 네오한천올리고당을 생산할 수 있는 agarase를 생성하는 신규 해양성 세균을 분리하고, 이 균주가 생성하는 한천분해효소의 특성을 조사하였다. 한천분해활성을 가진 신규의 SH-2 균주는 경상남도 남해군 연안에서 채취한 해수에서 분리하였으며, 16S rDNA 염기서열분석을 통해 Marinomonas 속 세균과 약 99% 유사하여 Marinomonas sp. SH-2로 명명하였다. Agarase는 Marinomonas sp. SH-2 균주의 배양액으로부터 추출하였으며, 한천분해활성을 측정한 결과, pH 6.0의 20 mM Tris-HCl buffer를 사용할 경우 30℃에서 최고 활성(170.2 units/l)이 나타났다. 하지만, 40℃ 이상의 온도에서 0.5시간 이상 처리할 경우 효소의 잔존활성이 40% 이하로 감소하는 것으로 보아 이 효소는 내열성을 가지지 않는다고 판단되었다. 효소의 가수분해산물을 TLC로 분석한 결과, Marinomonas sp. SH-2으로부터 생성되는 효소는 아가로스를 분해하여 neoagarohexaose와 neoagarotetraose를 생성하여 β-agarase로 확인되었다. 따라서 Marinomonas sp. SH-2와 이 균주의 한천분해효소는 식품, 화장품, 의약품 연구 등에 실용적으로 적용할 수 있을 것이다. This study aimed to isolate a novel agarase-producing marine bacterium and characterize its agarase, as agarases are known to produce biofunctional agarooligosaccharides or neo-agarooligosaccharides. A novel agar-degrading bacterium, SH-2, was isolated from the seawater of Namhae in Gyeongnam Province, Korea, and cultured in Marine agar 2216 medium. The 16S rRNA gene sequence represented 99% identity with that of the members of the Marinomonas genus; hence, the isolated bacterium was named Marinomonas sp. SH-2. The crude agarase was prepared from a culture medium of Marinomonas. sp SH-2, and exhibited maximum agarase activity at 170.2 units/l. The optimum conditions were pH 6.0 and 30℃ in 20 mM Tris-HCl buffer. The agarase activity of the bacterium was highly elevated from 20℃(42% relative activity) to 30℃(100%), and 82% activity was shown at 40℃. Its relative activities were less than 40% at over 40℃ after a 0.5 hr exposure. Relative activity was 100% at pH 6.0, while it was 72% and 48% at pH 5.0 and pH 7.0, respectively. The enzyme from Marinomonas sp. SH-2 degraded agarose to neoagarohexaose and neoagarotetraose, indicating that the enzyme is β-agarase. Thus, Marinomonas sp. SH-2 and its enzyme could be practical for applications in food, cosmetic, and medical research.