http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
A multi-layered hydrogel actuator working by self-folding assembly
이솔이,김희진,조성우,조윤나,백광현,공현준,정재현 한국공업화학회 2014 한국공업화학회 연구논문 초록집 Vol.2014 No.1
Significant progress in developing cell-based biohybrid actuators has increasingly been studied. For example, contractile stresses and forces of single cells and cell sheets of cardiomyocytes and skeletal myotubes cultured on micro-cantilevers have been measured. In this study, we present a hydrogel actuator consisting of two different layers with significantly different stiffness and capacities to uptake water in response of the environments. This multi-layered hydrogel actuator was prepared by assembling a bi-layered hydrogel, in which each layer consisted of PEGDA with different environment-responsive molecules and their concentrations.
분산 클러스터 환경에서 오픈데이라이트 컨트롤러 성능 분석 및 최적화
이솔이,김태홍,김태준,Lee, Solyi,Kim, Taehong,Kim, Taejoon 한국정보처리학회 2017 정보처리학회논문지. 컴퓨터 및 통신시스템 Vol.6 No.11
본 논문에서는 SDN (Software Defined Networking) 오픈소스 프레임워크인 오픈데이라이트(ODL, OpenDaylight) 컨트롤러 클러스터 환경에서 클러스터의 구조를 분석하며 고가용성(High availability)을 지원하는 컨트롤러 클러스터의 동작 방식을 다룬다. 또한 Raft 알고리즘의 리더 선정(Leader Election) 과정을 분석하고 효율적인 시스템 운용을 위한 Leader Election 과정의 개선 방안을 제안한다. 이와 함께 샤드(Shard) 리더와 샤드 팔로어의 성능차이를 제시하고, 기존과 제안 방식의 컨트롤러 클러스터의 성능을 비교 분석한다. 실험의 결과에 따르면 리더의 성능은 팔로어의 성능보다 좋으며 하나의 컨트롤러로 요청이 집중되어 전달될 때보다 분산된 컨트롤러로 요청이 전달될 때의 성능이 더 좋다. 따라서 제안 기법을 통하여 컨트롤러로의 요청을 분산함으로써 성능을 높일 수 있다. OpenDaylight is an SDN (Software Defined Networking) open source framework, which is popular in network fields recently. This paper analyzes the performance of a controller cluster architecture by focusing on distributed datastore and Raft leader election algorithm. In addition, we propose an enhanced version of Raft algorithm in order to improve the performance of distributed datastore by distributing shard leaders over controller cluster. This paper compares the conventional Raft algorithm with the proposed version of the Raft algorithm. Moreover, we compare the performance of distributed datastore according to shard roles such as leader and follower. Experimental results show that Shard leaders provide better performance than followers and Shard updating requests need to be distributed over multiple controllers. So, by using proposed version of Raft algorithm, controller performance can be improved. The details of the experiment results are cleary described.
스마트 주차정보시스템 이용자 서비스 중요도 분석에 관한 연구 - 대구광역시를 대상으로 -
이솔,김성회,안우영,김경석 한국도로학회 2020 한국도로학회논문집 Vol.22 No.5
PURPOSES : In this study, the causality between smart parking user services and its satisfaction level was analyzed statistically, and a smart parking priority decision model was established in terms of the user side. METHODS :The results of the Daegu Metropolitan City survey for the parking state, parking fee, transfer, convenience of use, facilities, and safety that could influence smart parking user satisfaction were used. A structural equation model in SPSS 26 and AMOS 26 programs that facilitates hypothesis testing and importance factor analysis between observed and latent variables was used. RESULTS : The results demonstrated that the importance factor loading on smart parking user services was in the following order: convenience of use (0.996), parking facilities (0.814), safety (0.803), parking information (0.706), transfer (0.618), and parking fee (0.426). Among them, the parking fee was not quite influential in decision making. CONCLUSIONS : The most influential user service on smart parking information systems was the convenience of use, in which congestion in parking lots and parking time were the most influential variables. The most influential variables were in the following order: in parking facilities, the route design of vehicle flow and size of the parking garage; in safety, the entrance location and the level of wear; in the parking state, the availability of parking space and parking fees; and finally in transfer, the convenience of transfer to other modes and the number of transfer parking lots.
구조방정식모형(SEM)을 활용한 대도시권 버스이용자의 통행시간 만족도에 대한 중요도 분석
이솔,안우영 한국교통연구원 2015 交通硏究 Vol.22 No.4
In order to enhance the competitiveness of buses, the travel time of bus users, including out-of-vehicle time and in-vehicle time, should first be improved. In this study, the causality between exogenous variables related to bus travel time and endogenous variables related to bus travel time satisfaction is tested statistically by using a Structural Equation Model. A novel decision making model to improve bus users' travel time satisfaction is provided by using the results of importance factor analysis. The results of the importance factor analysis show that there is a negative relationship between travel time and travel time satisfaction for bus users in metropolitan cities. The most influential variable for travel time is transfer time (0.95) and for travel time satisfaction is transfer time satisfaction (0.47) and in-vehicle time (0.47). If travel time is more than 30 minutes, transfer time (0.50) is the most influential variable; otherwise, in-vehicle time (0.90) is the most influential variable relatively. Thus, in order to improve bus users' travel time satisfaction, transfer time and in-vehicle time related facilities should be invested in preferentially. 대중교통의 중심이라고 할 수 있는 버스의 경쟁력 강화를 위해서는 접근시간, 환승시간, 탑승시간 등 버스이용자의 통행시간에 대한 개선이 우선적으로 필요하다. 따라서 본 연구에서는 구조방정식모형(SEM, Structural Equation Model)을 활용하여 버스의 시설서비스 및 운영서비스와 직접적으로 관련된 통행시간을 외생변수(exogenous variables)로 그리고 통행시간 만족도를 내생변수(endogenous variables)로 사용하여 통행시간과 통행시간 만족도간의 인과관계를 통계적으로 검증하고 중요도 분석(importance factor analysis)을 통해 버스이용자의 통행시간 만족도 개선을 위한 투자우선순위 결정모형을 제시하였다. 분석결과 대도시권 버스이용자의 통행시간과 통행시간 만족도 사이에는 음(−)의 인과관계가 있는 것으로 분석되었다. 통행시간에 가장 큰 영향을 주는 변수는 환승시간(0.95)으로 분석되었으며, 통행시간 만족도에 가장 큰 영향을 주는 변수는 환승시간 만족도(0.47)와 탑승시간 만족도(0.47)로 분석되었다. 특히, 통행시간이 30분 이상인 경우 환승시간(0.50)의 중요도가 높은 것으로 분석되었으며, 통행시간이 30분 이하인 경우는 탑승시간(0.90)의 중요도가 높은 것으로 분석되었다.
이솔,허나래,허석모 대한치과의사협회 2016 대한치과의사협회지 Vol.54 No.11
Objectives: Periodontitis is multifactorial disease mainly caused by microbial community. Recently, some research has been conducted to find other possible risk factors including stress hormones related to periodontitis. Psychological stress can affect the periodontal health by a variety of biological mechanisms. This study compared the stress hormone levels in healthy subjects and patients with periodontal disease using saliva in order to investigate the association between periodontitis and stress. Methods: The human saliva was collected from 38 periodontally healthy individuals and 34 patients with chronic periodontitis under Institutional Review Board. Their age was 20-60 years (40.3 10.45). From these samples, determination of salivary levels of cortisol and Dehydroepiandrosterone (DHEA) performed by enzyme immunoassay kit (Salimetrics Europe, Suffolk, UK). The independent t-test and Mann-Whitney test for trend was applied using IBM SPSS statistics version 12.0 Program to analyze statistically significant differences. Results: Salivary cortisol levels of periodontitis patients were higher than those levels of healthy subjects (P < 0.001), while salivary DHEA levels of periodontitis patients were not significantly different (P = 0.431). Salivary cortisol/DHEA ratio of periodontitis patients was higher than those levels of healthy subjects (P < 0.001). Conclusions: Our study demonstrates the high levels of cortisol concentrations and cortisol/DHEA ratio in saliva of periodontitis patients than those of healthy subjects. Since cortisol levels and cortisol/DHEA ratio can be significant factors related to the severity of periodontal disease, our study would be helpful for early diagnosis and treatment of periodontal disease.