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Hong, Chan,Nam, Jae-Do,Tak, Yong-Sug The Korean Electrochemical Society 2006 한국전기화학회지 Vol.9 No.4
In order to overcome the weak actuation and relaxation problems during the deformation of IPMC actuator, polymeric anion (polystyrenesulfonate)-doped polypyrrole(Ppy(PSS)) was electrodeposited onto IPMC actuator. Electrochemical quartz crystal microbalance study showed that hydrated cations were instilled into Ppy(PSS) film and polymeric-anion dopants introduced during polymerization were not expelled. Ppy(PSS)-coated IPMC actuator formed two electrode/electrolyte interfaces, Pt/nafion and Ppy(PSS)/bulk solution, and additive volume expansion phenomena at interfaces induced the large deformation compensating the relaxation of actuation by back diffusion of water.
( Hongchan Yoon ),( Baek-hyun Kim ),( Mukhiddinov Mukhriddin ),( Jinsoo Cho ) 한국인터넷정보학회 2018 KSII Transactions on Internet and Information Syst Vol.12 No.5
Extracting key visual information from images containing natural scene is a challenging task and an important step for the visually impaired to recognize information based on tactile graphics. In this study, a novel method is proposed for extracting salient regions based on global contrast enhancement and saliency cuts in order to improve the process of recognizing images for the visually impaired. To accomplish this, an image enhancement technique is applied to natural scene images, and a saliency map is acquired to measure the color contrast of homogeneous regions against other areas of the image. The saliency maps also help automatic salient region extraction, referred to as saliency cuts, and assist in obtaining a binary mask of high quality. Finally, outer boundaries and inner edges are detected in images with natural scene to identify edges that are visually significant. Experimental results indicate that the method we propose in this paper extracts salient objects effectively and achieves remarkable performance compared to conventional methods. Our method offers benefits in extracting salient objects and generating simple but important edges from images containing natural scene and for providing information to the visually impaired.
Hongchan Kim,Jeungtae Kim 한국철도학회 2011 International Journal of Railway Vol.4 No.1
The purpose of the present study is to develop conceptual design of a railway vehicle simulator based on a scaled model. Although the scaled simulator is limited in its ability to manipulate the full dynamics of a full-size railway vehicle, it has been known to have an advantage in that it could provide means of testing the fundamental dynamic behavior within a limited laboratory space and at low operation cost. The present study proposes a design strategy for a simulator so that a small scaled roller rig could be fabricated and operated in laboratory setting based on the design philosophy. The data obtained from experimental testing using a scale model can be used to verify and interpret the dynamic performance of full-scale railway vehicle by applying appropriate non-dimensional analysis.
Advanced Block Nested Loop Join for Extending SSD Lifetime
Roh, Hongchan,Shin, Mincheol,Jung, Wonmook,Park, Sanghyun IEEE 2017 IEEE TRANSACTIONS ON KNOWLEDGE AND DATA ENGINEERIN Vol.29 No.4
<P>Flash technology trends have shown that greater densities between flash memory cells increase read/write error rates and shorten solid-state drive (SSD) device lifetimes. This is critical for enterprise systems, causing such problems as service instability and increased total cost of ownership (TCO) because of SSD replacement. Therefore, numerous studies have focused on decreasing the amount of the DBMS writes. However, there has been no research that focused on decreasing the amount of temporary writes, which are primarily created by join processing. In DBMSs, there are two major join-processing algorithms, i.e., hybrid hash join (HHJ) and sort merge join (SMJ), proven to be the best according to DBMS workload; however, the two algorithms produce temporary writes of intermediate results. Therefore, we instead look to the block-nested loop join (BNLJ); it is well-known that the two algorithms are better than BNLJ, but BNLJ creates no intermediate result writes. It is reasonable to use BNLJ for a major join algorithm if its performance can be enhanced similar to those of HHJ and SMJ, considering BNLJ's advantage of extending SSD lifetimes. Therefore, in this paper, we propose an advanced BNLJ (ANLJ) algorithm that can match the performance of the two main join algorithms.</P>
제2형 당뇨병을 동반한 국내 고도비만 환자에서 대사비만 수술의 효과
이홍찬(Hongchan Lee),김미경(Mikyoung Kim),권혁상(Hyuksang Kwon),송기호(Kiho Song),김응국(Eungkook Kim) 대한외과학회 2010 Annals of Surgical Treatment and Research(ASRT) Vol.79 No.1
Purpose: Laparoscopic Roux-en-Y gastric bypass (LRYGB) and laparoscopic adjustable gastric banding (LAGB) are the most effective intervention and cure in achieving sustained weight loss in the morbidly obese with co-morbities, especially in type 2 diabetes mellitus (DM). Currently, there are few data in the literature presenting early diabetic outcomes between the 2 major bariatric surgeries in Korea. The aim of this study is to observe weight loss, improvement of type 2 DM after LRYGB and LAGB. Methods: 33 retrospective data were obtained from diabetic subjects undergoing LRYGB (n=53) and LAGB (n=77). These measurements included age, sex, body mass index (BMI), pre-operative diabetic duration, post-operative diabetic at follow-up visit after surgery. Paired t-test, and SPSS12.0 were used for statistical analysis. Results: 33 morbidly obese patients with type 2 DM who had both procedures complain of general weakness. Most patients were taking oral medications or insulin and tired of them. Pre and post-op 12 months of percent of excess weight loss (%EWL), fetal bovine serum (FBS), hemoglobin A1c (HbA1C) presented at 0%, 185.6 ㎎/㎗, 8.7% and 70.6%, 123.4 ㎎/㎗, 6.6% in patients who had LRYGB (P<0.05). Pre and post-op 12 months of %EWL, FBS, HbA1C presented at 0%, 180.6 ㎎/㎗, 8.4% and 32.8%, 136.5 ㎎/㎗, 6.8% in patients who had LAGB (P<0.05). Rate of discontinuance or decreasing for treatment of type 2 DM after surgery showed 94% for LRYGB versus 80% for LAGB, and unchanged rates were 6% versus 20%, respectively. Conclusion: This study showed LRYGB and LAGB are quite satisfactory and promising bariatric procedures with significant weight loss and improvement of type 2 DM in Koreans. LRYGB is significantly associated with more weight loss, more diabetic outcome than LAGB. Clinical experiences in Korea with both procedures are limited and a larger number of cases are need, but the recent data shows promising results that are comparable to the international experience.