제한된 메모리 환경에서 그래프 스트림 처리를 위한 효율적인 연속 서브 그래프 매칭 기법

이소민,김상혁,이현병,최도진,임종태,복경수,유재수 한국정보과학회 2022 정보과학회논문지 Vol.49 No.12

Recently, with the proliferation of social network services, the size of graph data has been becoming increasingly vast and graph data are changed in real-time. Therefore, it is necessary to perform continuous query processing on real-time graph streams. Moreover, it is difficult keep the entire large graph data in the main memory since its size is constrained in real-world application environments. Consequently, continuous subgraph matching techniques are required by considering memory-constrained environments. In this paper, we propose a continuous subgraph matching technique for graph streams in a memory-constrained environment. The proposed technique consists of modules such as index manager, query processor, and cache manager for efficient continuous subgraph matching. We conduct performance evaluations to demonstrate the superiority of the proposed technique. 최근 소셜 네트워크 서비스의 확산으로 그래프 데이터의 크기는 점차 방대해지고 있으며 실시간으로 변화된다. 따라서 실시간 그래프 스트림 상에서 연속 질의 처리 수행의 필요성이 증가하고 있다. 또한, 실제 응용 환경에서는 메모리 크기가 제한되어 있기 때문에 크기가 큰 그래프 데이터를 모두 메모리에 유지하기 어렵다. 따라서 제한된 메모리 환경을 고려한 연속 서브 그래프 매칭 기법이 필요하다. 본 논문에서는 제한된 메모리 환경에서 그래프 스트림 처리를 위한 연속 서브 그래프 매칭 기법을 제안한다. 제안하는 기법은 효율적인 연속 서브 그래프 매칭을 위해 색인 관리자, 질의 처리기 및 캐시 관리자 등과 같은 모듈들로 구성된다. 제안하는 기법의 우수성을 입증하기 위해 다양한 성능 평가를 수행한다.

Alginate Nanohydrogels Prepared by Emulsification-Diffusion Method

이소민,유은수,이수정,김한도 한국고분자학회 2009 Macromolecular Research Vol.17 No.3

This study reports the preparation and characterization of nanohydrogels by using sodium alginate as a model material. Alginate nanohydrogels (ANH) were prepared by emulsification-diffusion method in a w/o system with 1,2-diacyl-sn-glycero-3-phosphocholin as the lipophilic surfactant. The effects of the alginate to surfactant ratio and the remaining water contents on the mean particle size and swellability of ANHs were investigated in terms of the concentration, agitation speed, and agitation time. The feasibility of using nanohydrogels and their controllability were proved by the water the absorbency of ANHs during a 7-day evaluation by dynamic light scattering. In this work, the mean particle sizes of ANHs could be controlled from 49.2 nm (measured in ethanol phase) to 1.9 μm (measured in water phase, after 7 days of water absorption).

유화-확산법을 이용한 폴리스티렌 방향 나노 입자의 제조: 특성 및 방출 거동

이소민,손성옥,김윤미,이홍열,김민관,최진현,김한도,Lee, So-Min,Sohn, Sung-Ok,Kim, Yun-Mi,Lee, Hong-Youl,Kim, Min-Kwan,Choi, Jin-Hyun,Ghim, Han-Do 한국섬유공학회 2007 한국섬유공학회지 Vol.44 No.1

An attempt was carried out to suggest a nano-sized agent for durable fragrant finishing of fabrics. By adopting emulsification-diffusion method, we could prepare polystyrene (PS) aromatic nanoparticles (ANP) with lavender oil (LO) in core. Effects of process parameters on mean particle sire and its distribution of PS-ANPs were also examined. With controlled preparative condition, we could obtain PS-ANPs of diameters ranging 200 to 400 nm with narrow distribution. PS-ANPs were coated with poly(vinyl alcohol) layer to restrict the diffusion of LO from PS-ANPs. Sustained release properties of PS-ANPs were also evaluated.

자동 노출 조절장치를 사용한 흉부 후⋅전 방향 방사선 검사 시 격자 유⋅무에 따른 환자 선량과 영상품질 비교 연구

이소민,김한용,김동환,주영철 한국방사선학회 2023 한국방사선학회 논문지 Vol.17 No.4

This study compares dose difference between the presence or absence of grid in Chest PA radiography using auto exposure control and compares image quality among presence, absence or virtual grid, and proposes a new clinically useful grid combination for chest radiography. The human body phantom was placed Chest PA position and the dosimeter was placed at T6. The same irradiation conditions and field size were applied. 30 images were obtained in the state in which grid was applied and in the state in which grid was not applied, and an additional 30 images in which the virtual grid was applied to the image without the grid were obtained. Radiation dose was presented to entrance surface dose. The image quality was analyzed by comparing the signal-to-noise and contrast-to-noise ratio. ESD decreased by 48% when the grid was not used, compared to when the grid was used. SNR and CNR increased by 32% and 30% compared to grid use when grid was not used, respectively. In the case of using the virtual grid, it increased by 18% and 16% respectively, compared to the case of using the grid. As a result of this study, it is believed that when using a virtual grid instead of a grid, the quality of the image can be maintained while reducing the patient dose.

대학생의 비대면 수업 만족도에 영향을 미치는 요인: 학생 수업 참여도의 매개효과를 중심으로

이소민,김경리 한국교육방법학회 2021 교육방법연구 Vol.33 No.2

This study is to explore the factors that affect the satisfaction on non-face-to-face class in a university. It was analyzed based on the response data of students in A university. In particular, this study focused on mediating effect of student participation. The main findings of this study are as follows: First, as a result of exploring the factors that affect non-face-to-face class satisfaction, three factors(instructor preparation, school preparation, and class management) influenced satisfaction. Second, when the effect of school preparation on class satisfaction and the mediating effect of student participation were analyzed, student participation partially mediated the relationship between school preparation and satisfaction. Third, when the effect of instructor preparation on class satisfaction and the mediating effect of student participation were analyzed, student participation partially mediated the relationship between instructor preparation and satisfaction. Fourth, when the effect of class management on class satisfaction and the mediating effect of student participation were analyzed, student participation partially mediated the relationship between class management and satisfaction. Based on the support of the school, the preparation of the instructor, and the participation of the learners, we hope that students will be able to make more satisfying non-face-to-face class. 본 연구는 수도권 A대학에 재학 중인 학생들을 대상으로 실시한 온라인 조사 자료를 활용하여, 대학생의 비대면 수업에 영향을 끼치는 요인을 살펴보고자 수행되었다. 특히 대학생의 비대면 수업 만족도 영향 요인중 대학 차원의 준비, 교수자 차원의 수업 준비, 수업 운영 방식에 관한 인식이 대학생의 비대면 수업 만족도에 영향을 끼치는 경로에서 학생의 수업 참여도가 매개하는지 확인하였다. 본 연구의 주요 결과는 다음과 같다. 첫째, 대학생의 비대면 수업 만족도에 영향을 미치는 요인을 알아본 결과, 교수자 차원의 수업 준비, 대학 차원의 준비, 수업 운영 방식에 대한 인식 순으로 비대면 수업 만족도에 영향을 미치고 있었다. 둘째, 비대면 수업을 위한 대학 차원의 준비가 비대면 수업 만족도에 미치는 영향에서 학생 수업 참여도의 매개효과를 검토한 결과, 학생 수업 참여도가 대학 차원의 준비와 비대면 수업 만족도의 관계를 부분적으로 매개하였다. 셋째, 비대면 수업을 위한 교수자 차원의 수업 준비가 비대면 수업 만족도에 미치는 영향에서 학생 수업 참여도가 비대면 수업을 위한 교수자 차원의 수업 준비와 비대면 수업 만족도의 관계를 부분적으로 매개하였다. 넷째, 비대면 수업 운영 방식(성적평가 방법, 출석처리 방법, 강의 공개시간에 대한 적절성)에 대한 인식이 비대면 수업 만족도에 미치는 영향에서 학생 수업 참여도가 부분적으로 매개하였다. 이상의 결과를 바탕으로 비대면 수업이 보다 만족스러운 수업 형태로 정착할 수 있도록 하는 방안을 제시하였다.

후기 : 국제노동기구(ILO) 인턴십 후기

이소민 서울대학교 BK21 법학연구단 공익인권법연구센터 2013 공익과 인권 Vol.13 No.-

불확실성에 대한 인내력 부족 척도 단축형(IUS-12)의 타당화 연구

이소민,현명호,신재은 대한스트레스학회 2023 스트레스硏究 Vol.31 No.3

이 연구는 불확실성에 대한 인내력 부족 척도 단축형(IUS-12)을 타당화하였다. 평균 연령 31.29세의 일반인 총 404명(남자 114명, 여자 287명, 기타 3명)을 대상으로 탐색적 및 확인적 요인분석을 실시하였다. Bifactor 모형의 모형기반 신뢰도와 설명된 공통분산을 산출한 결과 IUS-12가 강한 일반 요인을 가지며 총점 사용이 타당함을 제시하였다. 다집단 확인적 요인분석을 통해 남녀 집단에서 측정 불변성을 검증하였다. 타당도 검증에서 특성불안, 걱정, 우울, 회피적 대처전략과 유의한 정적 상관을 보여 수렴 타당도가 적절하였다. 이는 IUS-12가 불확실성에 대한 인내력 부족을 신뢰롭고 타당하게 측정한다는 것을 시사한다. 끝으로 이 연구의 한계와 추후 연구에 대한 제안을 제시하였다. Background: This study aims to validate the short version of the Intolerance of Uncertainty Scale-12 (IUS-12). Methods: A comprehensive set of questionnaires, including the IUS-12, STAI-T, PSWQ, CES-D, and K-CSI, was administered and completed by 404 participants. The average age of the participants was 31.29 years (SD=9.18), comprising 114 men, 287 women, and 3 individuals identifying with the other gender. We conducted a factor analysis on the collected data and compared the fit indices of one-factor, two-factor, and bifactor models. Furthermore, a multiple-group confirmatory factor analysis evaluated measurement invariance between the men’s and women’s groups. Correlational analyses were also conducted. Results: Data from the study show that the bifactor model was the most appropriate, demonstrating good internal consistency. The Omega coefficients and explained common variance were computed to evaluate the dimensionality of the IUS-12, validating the use of the total score of the scale. Its factor model also showed that the measurement invariance sustained between two gender groups. The correlation analyses between the IUS-12 and other scales assessing attributes such as trait anxiety, worry, depression, and avoidance coping strategy supported convergent validity. Conclusions: These findings suggest that the IUS-12 is a reliable and valid measure for assessing the intolerance of uncertainty. The study also discusses its limitations and offers recommendations for future research endeavors.

유아기 자녀를 둔 어머니의 역할만족도 및 언어통제 유형과 유아의 인성 특성과의 관계

이소민,정계숙 한국생애학회 2014 생애학회지 Vol.4 No.1

This study examined the relationship among the role satisfaction of mother with a preschooler, her verbal regulation style, and the child’s personality. A sample included 300 mothers with 3-, 4-, and 5-year-old Korean children currently attending a nursery or kindergarten in Busan and Gyeongsangnam-do. The data collected in this study were analyzed by Pearson correlations and a multiple regression using the PASW 18.0. The results were as follow: First, it was revealed that there were significant relationships among all three main variables; Second, mother’s role satisfaction and verbal controlling style of child’s behaviors significantly predicted child’s personality, especially the role satisfaction having relatively greater impact on child’s personality development. In conclusion, compared to how a mother verbally regulate her child’s behaviors, how intrinsically she is satisfied being a mother affected the development of child’s personality traits more.

국내 분과 발표 : 수학 학습동기에 관한 진화심리학적 고찰

이소민 한국수학교육학회 2013 수학교육 학술지 Vol.2013 No.2

메타버스에서의 상상박물관 구현: 필리페 다베리오와 앙드레 말로의 관점을 중심으로

이소민,윤태준 현대사진영상학회 2022 현대사진영상학회논문집 Vol.25 No.3

With restrictions on physical movement due to the impact of COVID-19, the space called ‘Metaverse’ has received attention again. Metaverse is an alternative space where you can lead a diverse life online without any restrictions. Accordingly, art galleries and museums are conducting various activities using the metaverse, but Philippe Daverio and André Malraux dealt with this concept a long time ago. In his book 『Imagination Museum』, Philippe Daverio builds the Imagination Museum to appreciate works without physical restrictions. It consists of the 1st basement floor and the 3rd floor, and consists of a total of 12 rooms. Matching pictures are arranged in each room and hallway, and they are all conceived in the head and presented through the medium of a book. However, if you follow Daverio’s point of view, you get the illusion of seeing a real museum. He also says to actively use the Internet while reading books. It is said that it is much easier to find works on the Internet than it is difficult to see among visitors in a real museum, because they can be enlarged, and hidden details can be found in the paintings. In André Malraux’s 『Museum of Imagination』, it is said that an imaginary museum can be built even with a ceramic plate. Anyone can make a museum by themselves, as long as they have a picture of a ceramic plate. Their approach is no different from the current metaverse. An imaginary museum is accessible to anyone and can contain vast quantities. What should be noted here is the point where the various institutions of the actual museum are transformed into digital technology through the concept of the imaginary museum, and connected and expanded into a new world. Therefore, the Sangsang Museum can be a new alternative in the post-corona era.