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Modal loss mechanism of micro-structured VCSELs studied using full vector FDTD method.
Jo, Du-Ho,Vu, Ngoc Hai,Kim, Jin-Tae,Hwang, In-Kag Optical Society of America 2011 Optics express Vol.19 No.19
<P>Modal properties of vertical cavity surface-emitting lasers (VCSELs) with holey structures are studied using a finite difference time domain (FDTD) method. We investigate loss behavior with respect to the variation of structural parameters, and explain the loss mechanism of VCSELs. We also propose an effective method to estimate the modal loss based on mode profiles obtained using FDTD simulation. Our results could provide an important guideline for optimization of the microstructures of high-power single-mode VCSELs.</P>
Jo Hyeong Ho,Kim Nayoung,Oh Hyeon Jeong,Song Du Hyun,Choi Yonghoon,Park Jaehyung,Lee Jongchan,Yoon Hyuk,Shin Cheol Min,Park Young Soo,Lee Dong Ho,Lee Hye Seung,Park Young Suk,Ahn Sang-Hoon,Suh Yun-Suh 거트앤리버 소화기연관학회협의회 2023 Gut and Liver Vol.17 No.5
Background/Aims: There are few reports regarding mixed carcinoma, defined as a mixture of glandular and poorly cohesive components, in patients with gastric cancer (GC). The aim of this study was to evaluate the proportion and characteristics of mixed carcinoma in GC patients. Methods: A total of 7,215 patients diagnosed with GC at Seoul National University Bundang Hospital were enrolled from March 2011 to February 2020. GC was divided into four groups (wellmoderately differentiated GC, poorly differentiated GC, poorly cohesive carcinoma, and mixed carcinoma). The proportion of each GC type and the clinicopathological features were analyzed and divided into early GC and advanced GC. Results: The proportion of mixed carcinoma was 10.9% (n=787). In early GC, submucosal invasion was the most common in poorly differentiated (53.7%), and mixed carcinoma ranked second (41.1%). Mixed carcinoma showed the highest proportion of lymph node metastasis in early GC (23.0%) and advanced GC (78.3%). In advanced GC, the rate of distant metastasis was 3.6% and 3.9% in well-moderately differentiated GC and mixed carcinoma, respectively, lower than that in poorly differentiated GC (6.4%) and poorly cohesive carcinoma (5.7%), without statistical significance. Conclusions: Mixed carcinoma was associated with lymph node metastasis compared to other histological GC subtypes. And it showed relatively common submucosal invasion in early GC, but the rates of venous invasion and distant metastasis were lower in advanced GC. Further research is needed to uncover the mechanism underlying these characteristics of mixed carcinoma (Trial registration number: NCT04973631).
Jo, Pil-Sung,Park, Youn-Jung,Kang, Seok-Ju,Kim, Tae-Hee,Park, Cheol-Min,Kim, Eun-Hye,Ryu, Du-Yeol,Kim, Ho-Cheol 한국고분자학회 2010 Macromolecular Research Vol.18 No.8
This study examined the effect of a chemically nanostructured surface of cylinder forming poly(styrene-b-methyl methacrylate) (PS-b-PMMA) and poly(styrene-b-4vinyl pyridine) (PS-b-P4VP) block copolymer gate dielectrics on the performance of the bottom gate pentacene organic thin film transistor (OTFT). The field effect mobility of pentacene is affected mainly by the chemical properties of the top skin of a block copolymer layer. In the case of PS-b-PMMA with cylindrical PMMA microdomains that are located very closely at the block copolymer-pentacene interface because the surface energy of PMMA is similar to that of PS, the field effect mobility in general corresponds to the area averaged value of the two mobilities with the pure PS and PMMA layer. On the other hand, PS-b-P4VP copolymer results in a similar field effect mobility to that of the pure PS layer because the cylindrical P4VP microdomains are embedded in the PS matrix of which the surface energy is much lower than that of P4VP. The orientation of the cylindrical PMMA microdomains with respect to the surface also affects the field effect mobility, where the PMMA microdomains are aligned perpendicular to the surface, gave rise to a mobility approximately 50% higher than those parallel to the surface. The composite model with parallel and series resistance units offers qualitative understanding of these results.
Effect of Chuna (Shoulder Traction) Treatment on Frozen Shoulder During Korean Medical Treatment
Jo, Na Young,Yeo, In Ho,Jung, Se Ho,Sung, Hee Jin,Lee, Cham Geol,Lee, Eun Yong,Roh, Jeong Du Korean AcupunctureMoxibustion Medicine Society 2014 대한침구의학회지 Vol.21 No.1
Objectives : Through an analysis of the previous studies, It is estimated that Chuna(shoulder traction) is effective in reducing the pain and increasing motion range of shoulder joint of the patient. So this study is to investigate the effects of Chuna(shoulder traction) on frozen shoulder. Methods : After treated with acupuncture and electro stimulating therapy, the subjects were measured list of measurement. And then treated with Chuna(shoulder traction) therapy, the subjects were measured list of measurement again. All treatment was performed by the same doctor who is a highly qualified about Chuna(shoulder traction). Chuna(shoulder traction) treatment takes 15 minutes. Three kind of Chuna(shoulder traction) therapy were performed for 5 minutes each. Depending on the degree of the subject's pain, treatment strength was adjusted. Results : - Chuna simultaneous treatment group, shoulder joint range of flexion, extension, abduction, adduction, external rotation and internal rotation movement improved statistically significant. - Chuna simultaneous and acupuncture treatment group, visual analogue scale(VAS) scores of two groups decreased statistically significant. Conclusions : The result suggests that Chuna(shoulder traction) can be effective to recover range of motion and reduce pain on patients with frozen shoulder.
( Du Hwan Jo ),( Sang Geol Noh ),( Jong Tae Park ),( Choon Ho Kang ) 한국부식방식학회 2015 Corrosion Science and Technology Vol.14 No.5
Recently, household electronic industries require environmentally-friendly and highly functional steels in order to enhance the quality of human life. Customers especially require both excellent corrosion and abrasion resistant anti-fingerprint steels for digital TV panels. Thus POSCO has developed new functional electro-galvanized steels, which have double coated layers with organic-inorganic composites on the zinc surface of the steel for usage as the bottom chassis panel of TVs. The inorganic solution for the bottom layer consists of inorganic phosphate, magnesium, and zirconium compounds with a small amount of epoxy binder, and affords both improved adhesion properties by chemical conversion reactions and corrosion resistance due to a self-healing effect. The composite solution for the top layer was prepared by fine dispersion of organic-inorganic ingredients that consist of a urethane modified polyacrylate polymer, hardener, silica sol and a titanium complex inhibitor in aqueous media. Both composite solutions were coated on the steel surface by using a roll coater and then cured through an induction furnace in the electro-galvanizing line.New anti-fingerprint steel was evaluated for quality performance through such procedures as the salt spray test for corrosion resistance, tribological test for abrasion resistance, and conductivity test for surface electric conductance regarding to both types of polymer resin and coating weight of composite solution. New composite coated anti-fingerprint steels afford both better corrosion resistance and abrasion properties compared to conventional anti-fingerprint steel that mainly consists of acrylate polymers. Detailed discussions of both composite solutions and experimental results suggest that urethane modifications of acrylate polymers of composite solutions play a key role in enhanced quality performances.