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The Effectiveness Analysis on Set of Ramp Metering STOP-line Using Traffic Simulation Model (교통시뮬레이션 모형을 이용한 램프미터링 정지선 설정에 따른 효과분석)

  • Kim, In Su;Yang, Choong Heon
    • International Journal of Highway Engineering
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    • v.16 no.1
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    • pp.111-118
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    • 2014
  • PURPOSES : This study performs fundamental research on ramp-metering design criteria. METHODS : We carefully review previous studies in terms of ramp-metering design criteria and then consider applicability in Korea. For this, traffic simulation model is employed to analyze actual effect according to specific location of stop-line when implementing ramp-metering. RESULTS : When a stop-line moving forward with a 50m interval, travel speed at mainline relative to current stop-line location tends to decrease. However, traveling speed at approach roads increase about 5~18% under the same condition. When a stop-line location moving backward with a 50m interval, mainline travel speed increase approximately 17~32% whereas traveling speed at approach roads decrease. All cases are compared with the current stop-line location. CONCLUSIONS : We believe that both cases are useful with respect to freeway management. For example, moving forward a stop-line case can be used management for queuing area at ramp section and approach roads. Moving backward a stop-line case can be used for traffic control, focusing on mainline of freeways.

Seven-year Survival Rate of On-line Hemodiafiltration

  • Yoon, Jung-Hwan;Kim, Nam-Ho
    • Biomedical Science Letters
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    • v.25 no.1
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    • pp.32-39
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    • 2019
  • Conventional high-flux hemodialysis (HD) is not as good as normal kidney function. Morbidity and mortality rates of patients receiving HD are still very high. To increase mid-to-large molecule clearance by combining diffusion and convection, on-line hemodiafiltration (HDF) is required. The objective of this study was to compare long-term survival rate of patients treated with on-line HDF to those who received conventional high-flux HD by reviewing data from Chonnam National University Hospital (CNUH). We selected patients who attended the 'CUNH dialysis center' and agreed to participate in the study. Overall, 40 patients with ESRD switched from high flux HD to on-line HDF or started on-line HDF from August 2007 to December 2009. Additionally, a total of 42 patients receiving conventional high-flux HD during the same period were enrolled. We then reviewed long-term survival rate of patients receiving on-line HDF over the next seven years. When we compared survival rates for seven years, the survival rate of the group receiving on-line HDF was 65% (26/40) while that of the group receiving the conventional high-flux HD was 54.8% (23/42). Although the number of patients was small to see survival difference clearly by one specific dialysis modality, there was somewhat difference in survival rate between the two groups. Indicators such as anemia, calcium-phosphate metabolism, nutritional status, treatment adequacy, and hospitalization were also improved in the group receiving HDF. Overall, results of our study showed beneficial effects of on-line HDF on clinical outcomes and survival in chronic HD patients.

CAT 유전자를 지닌 HIV-1을 이용한 시험관내 항 AIDS 약물의 약효 검색

  • 성영철
    • Proceedings of the Korean Society of Applied Pharmacology
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    • 1993.04a
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    • pp.80-80
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    • 1993
  • (목적) 본 연구에서 사용된 바이러스는 HIV-1 nef유전자가 일부 삭제되고 대신 Chloramphenicol acetyltransferase(CAT)가 pSVCAT recombinant 바이러스다. 이러한 recombinant 바이러스를 사용하는 이유는 첫째, CAT activity가 매우 민감하므로 바이러스의 복제억제 정도를 정확하게 측정 할 수 있고 둘째, simian immunodeficiency virus(SIV)의 경우 nef 유전가 in vivo에서는 바이러스의 복제에 필수적이므로 HIV가 SIV와 유사한 것으로 미루어 본 연구에서 사용되는 recombinant SVCAT 바이러스가 안전한 것으로 고려되기 때문이다. (방법) 특히 화합물이 HIV-1의 복제에 얼마나 영향이 있는가는 1) 어느정 도의 virus inoculm을 넣었는지 2) 사용하는 cell line 3) 사용한 cell line의 infection kinetics 4) 실험의 지속기간 5) 테스트하는 assay의 sensitivity에 의존한다. 따라서 $10^{5}$ cell의 H9과 sup T1을 24 well plate에 넣고 sup T1 cell line의 경우 3일 후 항 화합물에 의한 syncytia 형성 및 CAT activity의 억제정도를 현재 AIDS drug으로 쓰이고 있는 Zidovudine을 control로 비교 관찰하였다. H9 cell line의 경우 3일 간격으로 media의 3/4을 fresh media로 바꾸어 주고 9일 후 CAT assay를 하였다. 이러한 assay에서 activity를 보이는 화합물을 reverse transcriptase와 P24 ELISA assay를 재확인하였다.다.

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Analysis of Poly(Ethylene-co-Vinyl Acetate) Using Off-line Pyrolysis

  • Choi, Sung-Seen;Kim, Eunha
    • Elastomers and Composites
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    • v.51 no.1
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    • pp.63-67
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    • 2016
  • Poly(ethylene-co-vinyl acetate) (EVA) was pyrolyzed to eliminate acetic acid of VA unit using off-line pyrolysis, and the deacetylated EVA was analyzed infrared spectroscopy (IR) and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). EVA film for deacetylation was prepared by solution casting on aluminum foil and it was pyrolyzed at low temperature of $300^{\circ}C$ in the off-line pyrolysis apparatus. After deacetylation, carbon-carbon double bond (C=C) was formed by 1,2-elimination of the VA unit in the EVA backbone. Most of C=C bonds were trans-1,4-unit and 1,2-unit was also observed. Presence of the 1,2-unit in deacetylated EVA indicates that terminal or branch VA units exist in the raw EVA. Py-GC/MS chromatogram of deacetylated EVA displayed much smaller acetic acid and much more abundant other pyrolysis products than that of raw EVA, which means that the pyrolysis efficiency and separation condition were improved.

A Design and Algorithm Implementation of Waveguide for 3way Line Array Speaker (3way 라인어레이 스피커를 위한 웨이브가이드 알고리즘 구현 및 설계)

  • Hwang, Jee Won;Kim, ByunKon;Cho, Juphil
    • The Journal of Korea Institute of Information, Electronics, and Communication Technology
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    • v.13 no.1
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    • pp.1-7
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    • 2020
  • Directivity control technology of sound system is a key technology for improving sound quality. Providing a line source rather than a point source in an acoustic system can reduce the effects of attenuation interference at long distances, thereby providing high quality sound. In particular, A line-array speaker system can be used to provide coherent, high-quality sound over long distances. However, high frequencies have shorter wavelengths, so the distance between the speakers of a line array system must be shorter, but there are physical limitations. In this paper, we designed a wave guide and installed it in the speaker's compression driver to solve this problem. We measured and tested various acoustic characteristics to verify the performance of the speaker. As a result, when the line array sound system is constructed using the developed speakers, it is possible to provide a line source in all areas including the treble range, thereby achieving the same effect as a single extended source and providing high quality sound up to far distances.

Unequal Multi-Section Power Divider using CPW and Offset Coupled Transmission Lines (CPW와 Offset 결합 전송선로를 이용한 비대칭 다단 분배기)

  • Choi, Jong-Un;Yoon, Young-Chul;Sung, Gyu-Je;Kim, Young
    • Journal of Advanced Navigation Technology
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    • v.23 no.4
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    • pp.309-315
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    • 2019
  • This paper proposes an implementation of unequal power divider with 1:3 and 1:4 splitting ratio in multi-section structure using CPW and offset coupled transmission line. The power divider consists of a multi-section transmission line and a circuit with parallel capacitors and resistors. A multi-section transmission line was implemented by decomposing a ${\lambda}/4$ single transmission line terminated by an arbitrary impedance and converging it with a multi-section transmission line shorter than $90^{\circ}$ electrical length, and RC parallel circuits were connected between transmission lines to obtain reflection coefficient of output port and isolation characteristics between the output port. In this way, it was confirmed that the transmission lines at the unequal power divider designed at 2 GHz were shorter than ${\lambda}/4$ and implemented at least 27% less than the conventional ones, and that the broadband characteristics could be obtained.

A Study on the Princess Line by Body Types (Part I) - Focused on Body Types of A & H -

  • Kim, Sook-Jung;Suh, Mi-A
    • The International Journal of Costume Culture
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    • v.4 no.3
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    • pp.182-194
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    • 2001
  • The main purpose is to study lines on different body types and to disguise any imperfections by using diverse princess lines. We separated festers body shapes into specific body types, A, H by applying both the direct and the indirect measurements. Following are the results of the study: 1. nose are the resulting illusion effects when the shoulder width of the princess line was fixed. In case of the armhole princess line, the illusion that the waist intervals were narrow or wide in A-line silhouette. In case the shoulder princess line, when the waist interval was narrow, it appeared to show narrow shoulder in A-line silhouette. While the wide waist interval shows the wide shoulder width in H-line silhouette. It regards body type H in the same light as H-line silhouette when the waist interval is narrow, it appeared to show narrow shoulder width in A-line silhouette. When the waist interval was wide, it appeared to give the narrow shoulder width. 2. When the princess lines waist width was fixed in order to study illusion effects of waist widths. Generally, for body type A, Whether the waist interval princess line is narrow or wide, the princess line is located comparatively wide, in A-line silhouette appeared to show relatively slender waist. For body type H, whether the waist interval is narrow or wide, the princess line us situated comparatively narrow interval, H-line silhouette appeared to show sum waist but the differences are not significant 3. The illusion of the hip were studied by fixating the width of the skirt and varying the locations of princess line and waist widths. For the location of both armhole and shoulder princess line in H and A-line silhouette, the narrow shoulder width and the waist appeared to show narrow hips. mile they are wide appeared to show wide hips. 4. With both waist and skirt width fuel, all two body types showed taller and slender postures when the princess line originated from the shoulder compare to the armhole.

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A Robust Staff Line Height and Staff Line Space Estimation for the Preprocessing of Music Score Recognition (악보인식 전처리를 위한 강건한 오선 두께와 간격 추정 방법)

  • Na, In-Seop;Kim, Soo-Hyung;Nquyen, Trung Quy
    • Journal of Internet Computing and Services
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    • v.16 no.1
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    • pp.29-37
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    • 2015
  • In this paper, we propose a robust pre-processing module for camera-based Optical Music Score Recognition (OMR) on mobile device. The captured images likely suffer for recognition from many distortions such as illumination, blur, low resolution, etc. Especially, the complex background music sheets recognition are difficult. Through any symbol recognition system, the staff line height and staff line space are used many times and have a big impact on recognition module. A robust and accurate staff line height and staff line space are essential. Some staff line height and staff line space are proposed for binary image. But in case of complex background music sheet image, the binarization results from common binarization algorithm are not satisfactory. It can cause incorrect staff line height and staff line space estimation. We propose a robust staff line height and staff line space estimation by using run-length encoding technique on edge image. Proposed method is composed of two steps, first step, we conducted the staff line height and staff line space estimation based on edge image using by Sobel operator on image blocks. Each column of edge image is encoded by run-length encoding algorithm Second step, we detect the staff line using by Stable Path algorithm and removal the staff line using by adaptive Line Track Height algorithm which is to track the staff lines positions. The result has shown that robust and accurate estimation is possible even in complex background cases.

A Study on the Effect of On-line Store Attributes on Consumers' Purchase Intention of Internet Fashion Product Shopping (온라인상의 패션제품 구매의도에 영향을 미치는 온라인 점포 속성에 관한 연구)

  • 구양숙;이승민
    • Journal of the Korean Society of Clothing and Textiles
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    • v.25 no.6
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    • pp.1100-1111
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    • 2001
  • The purpose of this study was to develop fashion On-line store attributes for fashion On-line shopping mall and to identify significant On-line store attributes, influencing consumers'purchase intention of interned fashion product shopping. A questionnaire was administered to 456 adults who had purchasing experience at fashion On-line shopping mall. SPSS 9.0 package was used for data analysis. Factor analysis, $X^2-test$, t-test, frequency, percentage, one-way ANOVA, multiple regression analysis were utilized. The results were as follows; 1. The On-line store attribute dimensions of fashion On-line shopping mall were tangibility, variety, marketing promotion, responsiveness, reputation, price and convenience. 2. The purchase experienced consumers showed higher purchase intention of Internet fashion product shopping and highly perceived about all sub-factors, except reputation. in On-line store attributes that have significantly positive influence on fashion On-line shopping attitudes. The purchase experienced consumers showed more favorable attitudes toward Fashion On-line shopping than non purchase experienced consumers. Attitudes toward Fashion On-line shopping have directly impact on purchase intention of Internet fashion product shopping.

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The Comparison of Field Uniformity and SAR between TEM, Loop and Combined Elemented 16 Channel Transmit Arrays (TEM 형과 Loop 형의 전송소자를 이용한 16채널 3T Body 전송코일의 자장 균일도와 안전도 비교)

  • Ryu, Yeunchul;Kim, Young Beom
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.63 no.3
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    • pp.404-408
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    • 2014
  • In this research we evaluate the excitation homogeneity and SAR of three different Tx arrays after B1+ Shimming in the human body at 3T. Through the simulations, we compared the field properties that are standard deviation and mean value of transverse magnetization for 1) strip line TEM array, 2) rectangular loop array, 3) combined array of strip line element and rectangular loop and shown the utilities of B1+ shimming in human body model. After B1+ shimming, it is evaluated four different types of SAR for body mesh through whole body simulation; those are average, maximum 1-cell, maximum 1-gram, and maximum 10-gram SAR. It appears that in this particular comparison an array based on strip line elements can produce better homogeneity and lower SAR than an array of rectangular loops or an array of combined elements (strip line and loop). While many factors are considered in designing coils for production, it is hoped that methods and results like these will be used in the future to guide decisions and maximize benefit.