Rapidly Self-Assembling Three-Dimensional Opal Photonic Crystals

Cheng Yi Wu,Ngoc Diep Lai,Chia Chen Hsu 한국물리학회 2008 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.52 No.5

We demonstrate a useful technique to rapidly self-assemble silica particles to form opal photonic crystals. Silica suspensions were first synthesized following the single-step Stober's method, with controllable particles diameters ranging from 200 to 800 nm. The suspensions were then injected into a cubic cell composed of two glass substrates and two controllable spacers. The self-assembly process was accelerated by heating the cell to an arbitrary temperature between 30℃ and 90℃. The opal particles were self-assembled into ordered structures within several minutes. The periodic structures were characterized by checking the scanning electron microscopy images and measuring the re ection spectra. The structure was quite uniform for very large areas and the number of layers could be controlled by using the formation temperature. The measured re ection spectra were in agreement with the simulation results obtained by using the transfer matrix method. The re ection spectra were blue shifted as the incident angle deviated from the normal direction, which could be justified simply by using a combination of Bragg formula and Snell's Law. We demonstrate a useful technique to rapidly self-assemble silica particles to form opal photonic crystals. Silica suspensions were first synthesized following the single-step Stober's method, with controllable particles diameters ranging from 200 to 800 nm. The suspensions were then injected into a cubic cell composed of two glass substrates and two controllable spacers. The self-assembly process was accelerated by heating the cell to an arbitrary temperature between 30℃ and 90℃. The opal particles were self-assembled into ordered structures within several minutes. The periodic structures were characterized by checking the scanning electron microscopy images and measuring the re ection spectra. The structure was quite uniform for very large areas and the number of layers could be controlled by using the formation temperature. The measured re ection spectra were in agreement with the simulation results obtained by using the transfer matrix method. The re ection spectra were blue shifted as the incident angle deviated from the normal direction, which could be justified simply by using a combination of Bragg formula and Snell's Law.

Burial depth of anode affected the bacterial community structure of sediment microbial fuel cells

Yi-cheng Wu,Hong-jie Wu,Hai-yan Fu,Zhineng Dai,Ze-jie Wang 대한환경공학회 2020 Environmental Engineering Research Vol.25 No.6

Sediment microbial fuel cells (SMFCs) are attractive devices to in situ power environmental monitoring sensors and bioremediate contaminated soils/sediments. Burial depth of the anode was verified to affect the performance of SMFCs. The present research evaluated the differences in microbial community structure of anodic biofilms located at different depth. It was demonstrated that both microbial diversity and community structure of anodic biofilms were influenced by the depth of anode location. Microbial diversity decreased with increased anodic depth. The number of the operational taxonomic units (OTUs) was determined as 1438 at the anode depth of 5 cm, which reduced to 1275 and 1005 at 10 cm and 15 cm, respectively. Cluster analysis revealed that microbial communities of 5 cm and 10 cm were clustered together, separated from the original sediment and 15 cm. Proteobacteria was the predominant phylum in all samples, followed by Bacteroidetes and Firmicutes. Beta- and Gamma-proteobacteria were the most abundant classes. A total of 23 OTUs showed high identity to 16S rRNA gene of exoelectrogens such as Geobacter and Pseudomonas. The present results provided insights into the effects of anode depth on the performance of SMFC from the perspectives of microbial community structure.

Earnings Manipulation, Corporate Governance and Executive Stock Option Grants: Evidence from Taiwan

Ming-Cheng Wu,Yi-Ting Huang,Yi-Jing Chen 한국증권학회 2012 Asia-Pacific Journal of Financial Studies Vol.41 No.3

Executive stock options (ESOs), serving as a compensation mechanism, are widely used in business administration. ESOs link managerial wealth to firm performance and shareholder wealth. The intrinsic value of ESOs is determined by the difference between the stock price and the strike price. Executives, as a result of self-interested incentives, would therefore manipulate firms’ reported earnings for influencing stock prices. Such conduct may boost the value of ESOs and then benefit managers greatly. This study attempts to explore if earnings had been manipulated before the ESO award date to satisfy some self-interested managers. In addition, the paper attempts to reveal the cause and effect relationship between executive incentives and earnings management when compensations are linked to stock prices. The empirical results show that there is a significant downward earnings management phenomenon before the ESO award date. Furthermore, quarterly earnings management occurs frequently around the ESO grant date.

Potential of a combination of entomopathogenic fungal strains and a non-ionic surfactant to control the fall armyworm (Spodoptera frugiperda)

Wu Sing-Shan,Tseng Ching-Tzu,Yang Yu-Hung,Liu Yao-Chia,Chang Ju-Chun,Gyawali Purushottam,Li Yi-Hsuan,Yang Tzu-Hao,Tsai Yi-Fang,Tang Li-Cheng,Nai Yu-Shin 한국응용곤충학회 2022 Journal of Asia-Pacific Entomology Vol.25 No.4

The fall armyworm, Spodoptera frugiperda, is an emerging invasive pest in Taiwan that feeds on a wide range of crops and causes serious damage. Herein, an entomopathogenic fungal library (EFLib) was constructed to identify potential microbes to control FAW. Twenty-eight indigenous entomopathogenic fungi (EPF) were iso lated and investigated for their potential pathogenicity, with Metarhizium pinghaense (Mp-NCHU-124) and Beauveria bassiana (Bb-NCHU-157) exerting dose-dependent effects on the 4th instar FAW larvae. The non-ionic surfactant Silwet L-77 rapidly killed FAW larvae after spraying at a concentration of 300 mg/kg and the toxic effect of Silwet L-77 on FAW larvae was dose-dependent. When the EPF isolates (10 6 conidia/mL) were applied to FAW larvae in combination with the non-ionic surfactant Silwet L-77 (30–90 mg/kg), the mortality rate dramatically increased and the LT 50 reduced, with increased fungal mycosis (Mp-NCHU-124: 38% to 72% and Bb-NCHU-157: 20 to 62%), indicating the high compatibility of EPF with the non-ionic surfactant. Thus, the Silwet L-77+EPF combined formulation has potential for practical field application for FAW pest control and sustainable agriculture in the future.

Anterior Cervical Discectomy and Fusion for Hirayama Disease: A Case Report and Literature Review

Yi-Hsuan Kuo,Chao-Hung Kuo,Wen-Cheng Huang,Jau-Ching Wu 대한척추신경외과학회 2019 Neurospine Vol.16 No.3

Hirayama disease, a juvenile muscular atrophy of the distal upper extremity, is a rare form of cervical flexion myelopathy characterized by insidiously progressive weakness of the hands and forearm muscles (i.e., painless amyotrophy). The pathognomonic finding is a markedly forward-shifted spinal cord during neck flexion, demonstrated by dynamic magnetic resonance imaging (MRI), as in a young man with muscle atrophy in the bilateral distal upper extremities. In this report, the authors describe a 31-year-old man who had the classic radiological and clinical presentations of Hirayama disease. Since prior medical treatment had been ineffective for years, he underwent multilevel instrumented anterior cervical discectomy and fusion (ACDF) to keep his subaxial cervical spine slightly-lordotic (nonflexion). His motor evoked potential amplitude improved immediately during the operation, and there were improvements of myelopathy and a modest reversal of muscle wasting at 1 year postoperatively. Postoperative dynamic cervical spine MRI also demonstrated minimal cord compression and elimination of the venous plexus engorgement dorsal to the thecal sac. Although Hirayama disease is benign in nature and frequently self-limiting, multilevel instrumented ACDF could be a reasonable management option.

Taiwan Neurosurgical Spine Society: The New Shining Star

Yi-Hsuan Kuo,Jau-Ching Wu,Wen-Cheng Huang,Ming-Chao Huang,E-Jian Lee,Henrich Cheng 대한척추신경외과학회 2018 Neurospine Vol.15 No.4

As spine surgery flourished in Taiwan and neurosurgeons became more involved in spine surgery towards the end of the 20th century, the Taiwan Neurosurgical Spine Society (TNSS), earlier named the Taiwan Neurospinal Society, was established on March 11, 2001. As its main founder, Dr. Chun-I Huang was elected as the first president of the TNSS. The goals of the TNSS were to promote research, to hold academic seminars, to participate in international conferences, and to exchange clinical experiences. The mission of the TNSS was successful, and the profession of spine surgery in Taiwan advanced during the first decade of the 21st century, culminating in the TNSS joining ASIA SPINE in 2010. Since its establishment, the TNSS has always been supportive of collaboration and communication with the Korean Spinal Neurosurgery Society and the Neurospinal Society of Japan. Through periodical meetings, supported by the TNSS, surgeons worldwide have enjoyed a platform of sharing and mutual learning. To further promote academic research, the TNSS has officially supported the journal Neurospine since 2018. With extensive efforts from local and international surgeons, the TNSS will continue to adhere to its mission and to advance the profession of spine surgery.

Design tables and charts for uniform and non-uniform tuned liquid column dampers in harmonic pitching motion

Wu, Jong-Cheng,Wang, Yen-Po,Chen, Yi-Hsuan Techno-Press 2012 Smart Structures and Systems, An International Jou Vol.9 No.2

In the first part of the paper, the optimal design parameters for tuned liquid column dampers (TLCD) in harmonic pitching motion were investigated. The configurations in design tables include uniform and non-uniform TLCDs with cross-sectional ratios of 0.3, 0.6, 1, 2 and 3 for the design in different situations. A closed-form solution of the structural response was used for performing numerical optimization. The results from optimization indicate that the optimal structural response always occurs when the two resonant peaks along the frequency axis are equal. The optimal frequency tuning ratio, optimal head loss coefficient, the corresponding response and other useful quantities are constructed in design tables as a guideline for practitioners. As the value of the head loss coefficient is only available through experiments, in the second part of the paper, the prediction of head loss coefficients in the form of a design chart are proposed based on a series of large scale tests in pitching base motions, aiming to ease the predicament of lacking the information of head loss for those who wishes to make designs without going through experimentation. A large extent of TLCDs with cross-sectional ratios of 0.3, 0.6, 1, 2 and 3 and orifice blocking ratios ranging from 0%, 20%, 40%, 60% to 80% were inspected by means of a closed-form solution under harmonic base motion for identification. For the convenience of practical use, the corresponding empirical formulas for predicting head loss coefficients of TLCDs in relation to the cross-sectional ratio and the orifice blocking ratio were also proposed. For supplemental information to horizontal base motion, the relation of head loss values versus blocking ratios and the corresponding empirical formulas were also presented in the end.

Slide Session : OS-CAD-06 ; Cardiology : Erythrocytosis Increased One-Year Mortality in Patients with St-Segment Elevation Myocardial Infarction Un-dergoing Primary Percutaneous Coronary Intervention

( Cheng Wei Liu ),( Yi Ching Lin ),( Chung Ming Tu ),( Pen Chih Liao ),( Kuan Change Chen ),( Yen Wen Wu ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1

Background: Anemia is associated with poor prognosis in patients with ST-segment elevation myocardial infarction(STEMI). However, it is unclear that erythrocytosis has protective effect in these populations. Hence, we conducted a retrospective cohort study to examine the relationship between erythrocytosis and mortality in patients with STEMI undergoing primary percutaneous coronary intervention (PCI ). Materials and Methods: We screened 1,156 consecutive patients with STEMI undergoing primary PCI in a single center during Feb 2007 and January 2012. There were 201 missing data for door-to-balloon time and 4 missing data for hemoglobin. Of 951 analyzable patients, they were divided into anemia (Hemoglobin<13.0mg/dl in men or <12.0mg/dl in women), normal hemoglobin, and erythrocytosis (hemoglobin =16.0mg/dl in men or =15.0mg/dl in women) groups. The study end point was one-year mortality. Results: There were 148, 535, and 268 patients in anemia, normal hemoglobin, and erythrocytosis groups, respectively. Patients in the anemia group were older and had lower body mass index than other two groups. There was more female, smokers, hypertension, and diabetes in the anemia group. One-year mortality rates were 16.2%, 6.5%, 2.6% (P<0.001) respectively. In univariate proportional hazards regression analysis, age, hemoglobin, total cholesterol, statin use, glycoprotein llb/llla inhibitor use, and TIMI risk score were associated with 1-year mortality in three groups. After adjustment for potential confounders, hemoglobin levels remained an independent predictor of one-year mortality in both anemia (hazard ratio 0.697, 95% CI 0.528-0.960) and erythrocytosis group (hazard ratio 3.129, 95% CI 1.1.474-6.642). Conclusions: Patients with STEMI and anemia had the worst outcomes than normal hemoglobin and erythrocytosis groups. Expectedly, hemoglobin had the protective effect on prognosis in anemia group. However, a hemoglobin level was an independent risk factor of one-year mortality in those with erythrocytosis.

CAD-Based Pose Estimation for Random Bin-Picking of Multiple Objects Using a RGB-D Camera

Cheng-Hei Wu,Sin-Yi Jiang,Kai-Tai Song 제어로봇시스템학회 2015 제어로봇시스템학회 국제학술대회 논문집 Vol.2015 No.10

In this paper, we propose a CAD-based 6-DOF pose estimation design for random bin-picking of multiple different objects using a Kinect RGB-D sensor. 3D CAD models of objects are constructed via a virtual camera, which generates a point cloud database for object recognition and pose estimation. A voxel grid filter is suggested to reduce the number of 3D point cloud of objects for reducing computing time of pose estimation. A voting-scheme method was adopted for the 6-DOF pose estimation a swell as object recognition of different type objects in the bin. Furthermore, an outlier filter is designed to filter out bad matching poses and occluded ones, so that the robot arm always picks up the upper object in the bin to increase pick up success rate. A series of experiments on a Kuka 6-axis robot revels that the proposed system works satisfactorily to pick up all random objects in the bin. The average recognition rate of three different type objects is 93.9% and the pickup success rate is 89.7%.

Efficacy and Safety of Autologous Fibroblast (FB) Seeded Biodegradable Scaffold for Rabbit Penile Girth Enlargement

( Yi Guang Wu ),( Zhe Jin ),( Zhong Cheng Xin ),( Wei Dong Song ),( Jing Peng ),( Zhi Chao Zhang ),( Bing Gao ),( Ze Long Kim ) 한국조직공학·재생의학회 2007 조직공학과 재생의학 Vol.4 No.4

The purpose of this experiment is to construct an in vitro model of rabbit penis enlargement using tissue engineering method, and to investigate the efficacy and safety of autologous fibroblast cell seeded to biodegradable scaffold and also to provide a new perspective of clinical application. We observed the growth of GFP transgenic fibroblast cell from SD mouse after transplantation with the biodegradable scaffold by fluorescence microscope. At the second hand, 160 male New Zealand rabbits were divided into four groups; Group A for control; Group B for acellular matrix implanted; Group C for scaffold implanted only; Group D for autologous cultured fibroblast seeded scaffold. Rabbit scrotal skin (4×4 mm) was detached under general anesthesia, and fibroblast (FB) was cultured and proliferated for 2weeks. Cultured cells were seeded into the scaffold and inserted on the between buck`s and dartos fascia of rabbit penis. To assess the efficacy and safety of the cells, we observed for 4months. The FB of rabbit were successfully cultured and confirmed by immunohistochemistry method. In the results of group D, dermal cell seeding group, the penile girth was significantly increased to 22.3% compared to other groups (Group A 0.3%, Group B 12.7%, Group C 14.6% and Group D 22.3%). We checked the results in 2~4 months later. We observed that moderate penile girth increase was gained using the biodegradable scaffold without other side-effects. Therefore, we carefully suggest a new guidance for penile augmentation by the tissue engineering method.