Sangkwon Han  Hyung Jong Bae  Junhoi Kim  Sunghwan Shin  Sung‐Eun Choi  Sung Hoon Lee  Sunghoon Kwon  Wook Park 《Advanced materials (Deerfield Beach, Fla.)》2012,24(44):5903-5903

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Woo Seok Choi  Christopher M. Rouleau  Sung Seok A. Seo  Zhenlin Luo  Hua Zhou  Timothy T. Fister  Jeffrey A. Eastman  Paul H. Fuoss  Dillon D. Fong  Jonathan Z. Tischler  Gyula Eres  Matthew F. Chisholm  Ho Nyung Lee 《Advanced materials (Deerfield Beach, Fla.)》2012,24(48):6422-6422

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Jong Hyuk Park  Palak Ambwani  Michael Manno  Nathan C. Lindquist  Prashant Nagpal  Sang‐Hyun Oh  Chris Leighton  David J. Norris 《Advanced materials (Deerfield Beach, Fla.)》2012,24(29):3988-3992

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Jong‐Kwan Bin  Nam‐Sung Cho  Jong‐In Hong 《Advanced materials (Deerfield Beach, Fla.)》2012,24(21):2911-2915

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Yi Lin  Jae‐Woo Kim  John W. Connell  Marisabel Lebrón‐Colón  Emilie J. Siochi 《Advanced Engineering Materials》2015,17(5):674-688

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Gun Woo Kang  In Hee Lee  Ki Sung Ahn  Jonghun Lee  Yunmi Ji  Jungmin Woo 《Hemodialysis international. International Symposium on Home Hemodialysis》2015,19(3):439-446

Many patients with end‐stage renal disease have significant impairment in health‐related quality of life (HRQoL). Most previous studies have focused on clinical factors; however, quality of life can also be affected by psychosocial factors. The aim of this study was to identify the possible predictors of HRQoL among clinical and psychosocial factors in hemodialysis (HD) patients. The study included 101 patients who were undergoing HD. Psychosocial factors were evaluated using the Hospital Anxiety and Depression Scale, Multidimensional Scale of Perceived Social Support, Montreal Cognitive Assessment, and Pittsburgh Sleep Quality Index. We also assessed laboratory and clinical factors, including albumin, Kt/V as a marker of dialysis adequacy, normalized protein catabolic rate, and duration of HD. The Euro Quality of Life Questionnaire 5‐Dimensional Classification (EQ‐5D) was used to evaluate HRQoL. The mean EQ‐5D index score was 0.704 ± 0.199. The following variables showed a significant association with the EQ‐5D index: age (P < 0.001), depression (P < 0.001), anxiety (P < 0.001), support from friends (P < 0.001), cognitive function (P < 0.001), duration of HD (P = 0.034), triglyceride (P = 0.031), total iron‐binding capacity (P = 0.036), and phosphorus (P = 0.037). Multiple regression analysis showed that age (95% confidence interval [CI] ?0.008 to ?0.002), anxiety (95% CI ?0.025 to ?0.009), and support from friends (95% CI 0.004 to 0.018) were independent predictors of impaired HRQoL. This study explored determinants of impaired HRQoL in HD patients. We found that impaired HRQoL was independently associated with age, anxiety, and support from friends. We should consider psychosocial as well as clinical factors when evaluating ways to improve HRQoL in HD patients.  相似文献   

    

So Mi Kim  Hyun Woo Kim  Ji Eun Lee  Eun Kyoung Lee  Hyun Deok Shin  Il Han Song 《Hemodialysis international. International Symposium on Home Hemodialysis》2015,19(1):66-71

Occult hepatitis B virus (HBV) infection is defined as the presence of HBV DNA in the liver tissue and/or serum of subjects seronegative for hepatitis B surface antigen (HBsAg). Occult HBV infection of hemodialysis (HD) patients is informative in terms of virus transmission, reactivation after kidney transplantation, and the progression of liver disease. However, there is little detailed information about occult HBV infection in the context of virus endemicity. We tried to investigate the seroprevalence and clinical features of occult HBV infection in HD patients in HBV‐endemic regions. We enrolled a total of 159 HD patients and 121 apparently healthy subjects at Dankook University Hospital and Jeju National University Hospital in Korea. HBsAg, anti‐HBs, anti‐HBc, and anti‐hepatitis C virus (HCV) antibody levels were measured by radioimmunoassay. Serum levels of HBV DNA were measured by real‐time polymerase chain reaction. The seroprevalence of occult HBV infection was 1.3% in HD patients and 2.5% in the healthy controls. This difference was not significant. The HBV load in all subjects with occult infection was <116 copies/mL, and all were positive for IgG anti‐HBc, regardless of the presence of anti‐HBs. None of the occult HBV‐infected subjects were co‐infected with HCV. One of the 2 HD patients with occult HBV infection had no history of blood transfusion. In this HBV‐endemic region, the seroprevalence of occult HBV infection in HD patients with a very low viral load was not significantly different from that in apparently healthy subjects.  相似文献   

    

Hanaul Noh  Goo‐Eun Jung  Sukhyun Kim  Seong‐Hun Yun  Ahjin Jo  Se‐Jong Kahng  Nam‐Joon Cho  Sang‐Joon Cho 《Small (Weinheim an der Bergstrasse, Germany)》2015,11(35):4526-4531

Nanoscale patterning with massively parallel 2D array tips is of significant interest in scanning probe lithography. A challenging task for tip‐based large area nanolithography is maintaining parallel tip arrays at the same contact point with a sample substrate in order to pattern a uniform array. Here, polymer pen lithography is demonstrated with a novel leveling method to account for the magnitude and direction of the total applied force of tip arrays by a multipoint force sensing structure integrated into the tip holder. This high‐precision approach results in a 0.001° slope of feature edge length variation over 1 cm wide tip arrays. The position sensitive leveling operates in a fully automated manner and is applicable to recently developed scanning probe lithography techniques of various kinds which can enable “desktop nanofabrication.”  相似文献   

    

Kyung Song  Christoph T. Koch  Ja Kyung Lee  Dong Yeong Kim  Jong Kyu Kim  Amin Parvizi  Woo Young Jung  Chan Gyung Park  Hyeok Jae Jeong  Hyoung Seop Kim  Ye Cao  Tiannan Yang  Long‐Qing Chen  Sang Ho Oh 《Advanced Materials Interfaces》2015,2(1)

A key to strain engineering of piezoelectric semiconductor devices is the quantitative assessment of the strain‐charge relationship. This is particularly demanding in current InGaN/GaN‐based light‐emitting diode (LED) designs as piezoelectric effects are known to degrade the device performance. Using the state‐of‐the‐art inline electron holography, we have obtained fully quantitative maps of the two‐dimensional strain tensor and total charge density in conventional blue LEDs and correlated these with sub‐nanometer spatial resolution. We show that the In_0.15Ga_0.85N quantum wells are compressively strained and elongated along the polar growth direction, exerting compressive stress/strain on the GaN quantum barriers. Interface sheet charges arising from a polarization gradient are obtained directly from the strain data and compared with the total charge density map, quantitatively verifying only 60% of the polarization charges are screened by electrons, leaving a substantial piezoelectric field in each In_0.15Ga_0.85N quantum well. The demonstrated capability of inline electron holography provides a technical breakthrough for future strain engineering of piezoelectric optoelectronic devices.  相似文献   

    

Sang Woo Kim  Kwan‐Woo Lee  Sang‐A Yi  Kuk Young Cho 《Advanced Materials Interfaces》2015,2(12)

Inverse opal scaffolds presenting an embossed‐pattern surface are prepared from colloidal crystal assemblies of uniformly sized golf‐ball‐shaped microparticles. Post‐treatments, such as thermal annealing during the bridging of the microparticles for opal preparation, are avoided to prevent deterioration of surface patterns of the sacrificial template. This presents a new approach to increase the surface‐area‐to‐volume ratio (SAV) by the alteration of morphological features in sophisticated 3D structures that remain largely unexamined owing to difficulties in their preparation. Previous results observed in 2D surfaces that show effective performance improvement through an increase in contact area, especially in biomedical applications, also appear applicable to patterned inverse opal scaffolds based on comparable results obtained from cell cultures. As the field of application of opal and inverse opal structures is expanding due to their unique structural advantages, such as 3D interconnectivity and periodic structures, our strategy opens the door for the use of patterned surfaces on highly sophisticated 3D structures, improving their performance via an increase in SAV.  相似文献