태양열 흡착 냉동의 새로운 기회

By Kai Wang,Edward A. Vineyard,김대중 (번역자) 대한설비공학회 2011 설비저널 Vol.40 No.12

Dimensionality-Tailored Quasi-2D Perovskites for Highly Stable and Efficient Photodetectors

임주원,( Huan Wang ),( Li Na Quan ),( Edward H. Sargent ),김동하 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.0

In this work, we developed perovskite photodetector devices by integ-rating dimension-reduced (quasi-2D) perovskites instead of conven-tional three-dimensional counterparts. A series of quasi-2D perovskite films were synthesized to obtain advanced photodectors with improved stability while retaining the comparable electrical perform-ance of conventional three-dimensional perovskites. The quasi-2D perovskite photodetector exhibited a responsivity of 0.53 A/W and detectivity of 2.20ⅹ1012 J, which is attributed to decreased leakage current. In addition, the current density of quasi-2D perovskite photo-detector maintained 76 % while three-dimensional perovskite photodetector remained only 15 % of initial level after 2,000 hours. We confirm the stability of perovskite films via X-ray diffraction (XRD) and atomic force microscope (AFM) measurement.

Polymer Deformable Mirror for Optical Auto Focusing

Jen-Liang Wang,Tyng-Yow Chen,ChingWei Liu,Chen-Wei Edward Chiu,Guo-Dung John Su 한국전자통신연구원 2007 ETRI Journal Vol.29 No.6

A low-stress organic polymer membrane is proposed as a deformable mirror that can be incorporated into a cellular phone camera to achieve auto focusing without motor-type moving parts. It is demonstrated that our fabricated device has an optical power of 20 diopters and can switch focus in 14 ms. The surface roughness of the organic membrane is measured around 15 nm, less than λ/20 of the visible light. With curve fitting, we found that the actuated membrane is almost parabolic in shape, which leads to less aberration than spherical surfaces. It is suitable for reflectiveoptics systems.

페로브스카이트 포토디텍터 최근 연구 동향

김동하,( Huan Wang ),임주원,전리나,권한나,( Edward H. Sargent ) 한국공업화학회 2018 한국공업화학회 연구논문 초록집 Vol.2018 No.1

Soft-tissue Sarcomas in the Asia-Pacific Region: A Systematic Review

Ngan, Roger,Wang, Edward,Porter, David,Desai, Jayesh,Prayogo, Nugroho,Devi, Beena,Quek, Richard Asian Pacific Journal of Cancer Prevention 2013 Asian Pacific journal of cancer prevention Vol.14 No.11

Background: Soft-tissue sarcomas require tailored and multidisciplinary treatment and management. However, little is known about how sarcomas are treated and managed throughout the Asia-Pacific region. Materials and Methods: MEDLINE was systematically searched using prespecified criteria. Publications (previous 10 years) that reported tumour characteristics, treatment patterns, survival outcomes, and/or safety outcomes of patients with soft-tissue sarcoma were selected. Exclusion criteria were studies of patients <18 years of age; ${\leq}10$ patients; countries other than Australia, Hong Kong, Indonesia, Korea, Malaysia, New Zealand, Philippines, Singapore, Taiwan, or Thailand; >20% benign tumours; sarcomas located in bones or joints; gastrointestinal stromal tumour; Kaposi's sarcoma; or not reporting relevant outcomes. Results: Of the 1,822 publications retrieved, 35 (32 studies) were included. Nearly all patients (98%, 1,992/2,024; 31 studies) were treated with surgery, and more studies used adjuvant radiotherapy than chemotherapy (24 vs 17 studies). Survival outcomes and recurrence rates varied among the studies because of the different histotypes, sites, and disease stages assessed. Only 5 studies reported safety findings. Conclusions: These findings highlight the lack of specific data available about soft-tissue sarcomas in the Asia-Pacific region. Better efforts to understand how the sarcoma is managed and treated will help improve patient outcomes in the region.

Antimicrobial therapies for chronic pain (part 2): the prevention and treatment of chronic pain

Eric J. Wang,Edward Dolomisiewicz,Jay Karri,Nuj Tontisirin,Steven P. Cohen 대한통증학회 2023 The Korean Journal of Pain Vol.36 No.3

The discovery and development of antimicrobial therapies represents one of the most significant advancements in modern medicine. Although the primary therapeutic intent of antimicrobials is to eliminate their target pathogens, several antimicrobials have been shown to provide analgesia as a secondary benefit. Antimicrobials have demonstrated analgesic effects in conditions that involve dysbiosis or potential subclinical infection (e.g ., chronic low back pain with Modic type 1 changes; chronic prostatitis/chronic pelvic pain; irritable bowel syndrome; inflammatory bowel disease; functional gastrointestinal disorders/dyspepsia; myalgic encephalomyelitis/chronic fatigue syndrome), and might even prevent the chronification of pain after acute infections that are associated with excessive systemic inflammation (e.g ., post COVID-19 condition/long Covid, rheumatic fever). Clinical studies often assess the analgesic effects of antimicrobial therapies in an observational manner, without the ability to identify causative relationships, and significant gaps in the understanding remain regarding the analgesic potential of antimicrobials. Numerous interrelated patient-specific, antimicrobial-specific, and disease-specific factors altogether contribute to the perception and experience of pain, and each of these requires further study. Given worldwide concerns regarding antimicrobial resistance, antimicrobials must continue to be used judiciously and are unlikely to be repurposed as primary analgesic medications. However, when equipoise exists among several antimicrobial treatment options, the potential analgesic benefits of certain antimicrobial agents might be a valuable aspect to consider in clinical decision-making. This article (the second in a two-part series) aims to comprehensively review the evidence on the prevention and treatment of chronic pain using antimicrobial therapies and suggest a framework for future studies on this topic.

에덴동굴 석순을 이용한 후기 플라이스토세의 고기후 변화 연구

조경남,우경식,김정찬,양동윤,Edwards R.L.,Cheng H.,Wang Y. 대한지질학회 2008 대한지질학회 학술대회 Vol.2008 No.

Cyclic Prefixed OQAM-OFDM and its Application to Single-Carrier FDMA

Xiqi Gao,Wenjin Wang,Xiang-Gen Xia,Au, Edward K S,Xiaohu You IEEE 2011 IEEE TRANSACTIONS ON COMMUNICATIONS Vol.59 No.5

<P>Single-carrier frequency division multiple access (SC-FDMA) has appeared to be a promising technique for high data rate uplink communications. Aimed at SC-FDMA applications, a cyclic prefixed version of the offset quadrature amplitude modulation based OFDM (OQAM-OFDM) is first proposed in this paper. We show that cyclic prefixed OQAM-OFDM (CP-OQAM-OFDM) can be realized within the framework of the standard OFDM system, and perfect recovery condition in the ideal channel is derived. We then apply CP-OQAM-OFDM to SC-FDMA transmission in frequency selective fading channels. Signal model and joint widely linear minimum mean square error (WLMMSE) equalization using a prior information with low complexity are developed. Compared with the existing DFTS-OFDM based SC-FDMA, the proposed SC-FDMA can significantly reduce envelope fluctuation (EF) of the transmitted signal while maintaining the bandwidth efficiency. The inherent structure of CP-OQAM-OFDM enables low-complexity joint equalization in the frequency domain to combat both the multiple access interference and the intersymbol interference. The joint WLMMSE equalization using a prior information guarantees optimal MMSE performance and supports Turbo receiver for improved bit error rate (BER) perform BER) performance. Simulation results confirm the effectiveness of the proposed SC-FDMA in terms of EF (including peak-to-average power ratio, instantaneous-to-average power ratio and cubic metric) and BER performances.</P>

Quality assessment of high performance concrete using digitized image elements

Sheng-Szu Peng,Her-Yung Wang,Yu-Te Chou,Edward H. Wang 사단법인 한국계산역학회 2012 Computers and Concrete, An International Journal Vol.10 No.4

The quality of high performance concrete largely depends on water cement ratio, porosity,material composition and mix methods. The uniformity of color, texture and compressive strengths are quality indicators commonly used to assess the overall characteristics of concrete mixes. The homogeneity and share of coarse aggregates play a key role in concrete quality and must be analyzed in a microscopic point of view. This research studies the quality of high performance concrete by taking drilled cores in both horizontal and vertical directions from a 1.0 m3 specimen. The coarse aggregate, expressed in digitized 100×116 dpi resolution images are processed based on brightness in colors through commercial software converted into text files. With the image converting to text format, the share of coarse aggregate is quantified leading to a satisfactory assessment of homogeneity – a quality index of high performance concrete. The compressive strengths of concrete and the shares of coarse aggregate of the samples are also compared in this research study to illustrate its correlation in concrete quality. It is concluded that a higher homogeneity of aggregate exists in the vertical plane than that of the horizontal planes of the high performance concrete. In addition, the concrete specimen showing denser particle packing has relatively higher compressive strengths. The research methodology provides an easy-to-use, direct measurement of high performance concrete when conducting quality assessment in the construction site.

Human Acellular Dermis versus Submuscular Tissue Expander Breast Reconstruction: A Multivariate Analysis of Short-Term Complications

Armando A. Davila,Akhil K. Seth,Edward Wang,Philip Hanwright,Karl Bilimoria,Neil Fine,John YS Kim 대한성형외과학회 2013 Archives of Plastic Surgery Vol.40 No.1

Background Acellular dermal matrix (ADM) allografts and their putative benefits have been increasingly described in prosthesis based breast reconstruction. There have been a myriad of analyses outlining ADM complication profiles, but few large-scale, multi-institutional studies exploring these outcomes. In this study, complication rates of acellular dermis-assisted tissue expander breast reconstruction were compared with traditional submuscular methods by evaluation of the American College of Surgeon’s National Surgical Quality Improvement Program (NSQIP) registry. Methods Patients who underwent immediate tissue expander breast reconstruction from 2006-2010 were identified using surgical procedure codes. Two hundred forty tracked variables from over 250 participating sites were extracted for patients undergoing acellular dermisassisted versus submuscular tissue expander reconstruction. Thirty-day postoperative outcomes and captured risk factors for complications were compared between the two groups. Results A total of 9,159 patients underwent tissue expander breast reconstruction; 1,717 using acellular dermis and 7,442 with submuscular expander placement. Total complications and reconstruction related complications were similar in both cohorts (5.5% vs. 5.3%, P=0.68 and 4.7% vs. 4.3%, P=0.39, respectively). Multivariate logistic regression revealed body mass index and smoking as independent risk factors for reconstructive complications in both cohorts (P<0.01). Conclusions The NSQIP database provides large-scale, multi-institutional, independent outcomes for acellular dermis and submuscular breast reconstruction. Both thirty-day complication profiles and risk factors for post operative morbidity are similar between these two reconstructive approaches.