에스퍼 기반 실시간 필터링 시스템

박세빈,길명선,최형진,문양세 한국정보과학회 2017 데이타베이스 연구 Vol.33 No.2

In this paper, we address the filtering problem of data stream data. In general, stream data are continuously generated, and the volume are very large. Therefore, in order to process such a large-capacity data stream in real time, a filtering algorithm should be used to sufficiently remove unnecessary data for analysis. However, since existing filtering algorithms are optimized for a single data type, it is difficult to precisely filter different data types with only one filtering algorithm. To solve this problem, in this paper we propose an Esper-based real-time filtering system that applies various filtering algorithms to Esper, a typical data stream management system (DSMS). The proposed system is designed and implemented based on the client-server model. First, the client transmits the user’s input for filtering to the server and displays the filtering results received from the server in real time. The server filters the data stream in real-time according to the user input and returns the results to the client in real time. Experimental results on real data stream show that the proposed system filters data stream accurately and quickly. In addition, because it supports various filtering algorithms, we can easily filter various types of streams and compare the results. As a result, the proposed filtering system is considered to be an excellent system for extracting data more accurately and efficiently by selectively supporting a filtering algorithm suitable for the type of input data streams. 본 논문에서는 데이터 스트림 대상의 필터링 문제를 다룬다. 데이터 스트림은 지속적으로 생성되며 수집하게 되면 크기 또한 거대해진다. 따라서, 이러한 대용량 데이터 스트림을 실시간 처리하기 위해서는 필터링 알고리즘을 사용하여 분석에 불필요한 데이터를 충분히 제거해야 한다. 그러나, 기존 필터링 알고리즘은 하나의 데이터 타입에 최적화 되어있기 때문에 각기 다른 데이터 타입에 대한 정확한 필터링이 어렵다. 본 논문에서는 이 같은 문제를 해결하기 위해 대표적인 데이터 스트림 처리 시스템(DSMS: data stream management system)인 에스퍼(Esper)에 여러 필터링 알고리즘을 적용한 에스퍼 기반 실시간 필터링 시스템을 클라이언트-서버 모델 기반으로 설계 및 구현한다. 먼저, 클라이언트는 필터링을 위한 사용자의 입력을 서버에게 전달하고, 서버로부터 전달받은 필터링 결과를 실시간 보여준다. 그리고, 서버는 클라이언트로부터 전달받은 사용자 입력에 따라 데이터 스트림을 실시간 필터링하고 그 결과를 클라이언트에게 실시간으로 반환한다. 실제 데이터 스트림을 활용한 실험 결과, 제안 시스템은 데이터 스트림을 정확하고 빠르게 필터링함을 확인하였다. 또한, 여러가지 필터링 알고리즘을 통합 지원하기 때문에, 다양한 타입의 스트림을 쉽게 필터링하고, 그 결과를 비교할 수 있다. 이 같은 결과로 보아, 제안하는 필터링 시스템은 입력 데이터 스트림 타입에 적합한 필터링 알고리즘을 선택적으로 지원함으로써, 보다 정확하고 효율적으로 데이터를 추출하는 우수한 시스템으로 사료된다.

Pressed Lateral Flow Assay Strips for Flow Delay-Induced Signal Enhancement in Lateral Flow Assay Strips

박세빈,신중호 한국바이오칩학회 2022 BioChip Journal Vol.16 No.4

This paper proposes that the signal intensity of a lateral flow assay (LFA) strip can be increased by pressing the top of the strip, effectively reducing its flow rate. The reduced flow rate allows more time for antigen–antibody interactions to occur, resulting in increased signal intensity and an improved detection limit. To assess the potential of the pressed LFA (pLFA) strip, C-reactive protein (CRP) diluted in phosphate-buffered saline (PBS) and serum is detected, affording signal enhancement and a lowered limit of detection. Additionally, to show that the signal enhancement by pressure-induced flow delay applies to existing LFA products, commercially available COVID-19 antigen test strips are pressed, and signal enhancement is observed. Lastly, we show that the signal intensity of COVID-19 LFA kits can be increased by approximately two-fold at maximum by applying pressure on top of the manufactured product. This study suggests that pressed LFA strips can be used to reduce the chances of determining ambiguous signals as false-negative results and can potentially improve the detection sensitivity.

Effects of Size and Content of Silica Filler on the Properties of Underfills

박세빈,김은지,문석규,김해찬,소주희,김동현 한국공업화학회 2023 한국공업화학회 연구논문 초록집 Vol.2023 No.1

Shape controllable MoS₂ nanoparticles: An enhanced catalyst for the hydrogen evolution reaction

박세빈,( Duy-thach Phan ),이형원,오대준,정선아,정재훈,전기준 한국공업화학회 2016 한국공업화학회 연구논문 초록집 Vol.2016 No.1

An advanced catalyst for the electrochemical hydrogen evolution reaction (HER) should reduce the overpotential and increase the efficiency. The most effective HER electrocatalyst are Pt-group metal. However, the rare Pt based materials are very expensive, then reduced practicability of Pt based water splitting. Previous reports concluded that the nanosized MoS₂ nanoparticles with exposed edges should be more active for HER electrocatalyst than MoS₂ in bulk form. In this work, we tried depositing MoS₂ nanoparticles in various shape of cube, circle and triangle by thermal chemical vapor deposition on different substrate for HER application. ^**Acknowledgement : This research was supported by the Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Science, ICT and Future Planning (NRF-2016M3A7B4904328).

효율적인 칼만 필터링을 위한 측정 노이즈 추천

박세빈,길명선,문양세 한국정보과학회 2018 데이타베이스 연구 Vol.34 No.1

In this paper, we propose an analytical method for recommending measurement noise in Kalman filtering. The Kalman filtering is a typical filtering algorithm used to correct inaccurate values of original data, and its filtering performance depends on the user-given noise parameters. At this time, if the wrong noise parameters are used due to lack of user experience, it may degrade the filtering performance. Therefore, in this paper, we propose new methods to analyze the input data and find the measurement noise which is the main noise parameter of the Kalman filtering, and apply it to the Kalman filter. The sensor data includes the noise value of the measuring machine, which is called measurement noise. We use two analytical methods of noise analysis of sensor data: moving average and Wavelet transformations. As a result of experiments, it has been found that the proposed method of calculating the measurement noise more accurately performs the Kalman filtering. 본 논문에서는 칼만 필터링의 측정 노이즈를 추천하는 방법을 다룬다. 칼만 필터링은 원본 데이터의 부정확한 값을 보정하는데 사용하는 대표적인 필터링 알고리즘으로, 사용자 경험에 의해 주어지는 노이즈 파라미터에 의해 성능이 달라진다. 이때, 경험이 부족한 사용자가 잘못된 노이즈 파라미터를 적용할 경우 이로 인해 필터링 성능이 저하될 수 있다. 이러한 문제를 해결하기 위해, 본 논문에서는 입력 데이터를 분석하여 칼만 필터링의 주요 노이즈 파라미터인 측정 노이즈를 찾아내고, 이를 칼만 필터링에 적용하는 방법을 제안한다. 대부분의 센서 데이터는 측정과정에서 포함되는 기계의 노이즈, 즉 측정 노이즈를 갖는다. 본 논문에서는 이동평균(moving average) 및 웨이블릿(Wavelet) 변환을 사용하여 센서 데이터의 노이즈를 분석하고, 이를 측정 노이즈로 활용한다. 실험 결과, 분석을 통해 측정 노이즈를 계산한 방법이 보다 정확하게 칼만 필터링을 수행하는 것으로 나타났다.

경사 고각 발사 시스템에서의 발사체 항법장치 급속 초기정렬기법에 대한 오차모델 분석 및 성능평가

박세빈 한국항행학회 2022 韓國航行學會論文誌 Vol.26 No.4

In this paper, we described the rapid initial alignment techniques of projectile navigation system for use in inclined launch systems. One-shot alignment technique, one of the rapid initial alignment techniques, is possible to align a navigation system within seconds because it uses external information from an launcher navigation system. However, since it has only been used in vertical launch systems, its performance in inclined launch systems has not been verified. Therefore, this paper analyzed the error elements that occur when the one-shot alignment technique is applied to the inclined launch system, and introduced a method to improve the alignment performance by minimizing those errors. Additionally, By simulating and testing the performance of the proposed alignment technique, it was verified that it is effective even in an environment where a real navigation system is used. 본 논문에서는 경사 고각 발사 시스템에서 활용하기 위한 발사체 항법장치의 급속 초기정렬기법에 대해 다룬다. 급속 초기정렬기법 중 하나인 원샷(One-shot) 정렬기법은 발사대에 장착된 항법장치의 정보를 활용하므로 수 초 내에 정렬이 가능하지만, 수직 발사체계에서만 적용되어 경사 고각에서의 성능이 검증되지 않았다. 따라서 본 논문에서는 원샷 정렬기법을 경사 고각 발사 시스템으로 적용 시 발생하는 오차 요소에 대해 분석하였고, 이를 최소화하여 정렬 성능을 개선하기 위한 방안을 소개하였다. 추가로, 제시한 원샷 정렬기법에 대해 성능시험을 수행함으로써, 실 항법장치를 운용하는 환경에서도 유효한 효과가 있음을 확인하였다.

20대 여성의 화장품 선호 구매장소에 따른 라이프스타일 연구

박세빈 ( Se-bin Park ),최미옥 ( Mee-ok Choi ) 한국미용학회 2020 한국미용학회지 Vol.26 No.5

Women in their 20s are in a period of increasing sensitivity to beauty as they begin to be sensitive to fashion and pursue their own image and expression of personality. Therefore, for women in their 20s, this researcher would like to understand the lifestyle according to the preferred place to buy cosmetics. A questionnaire was used to achieve the purpose of the study, and the specific contents consisted of age, final education, occupation, monthly income 4 questions, cosmetics purchase preference place 4 questions, and lifestyle 29 questions, total 37 questions were. The survey period was conducted from May 1 to June 5, 2020, and SPSSWIN 21.0 program was used to process the collected data and statistics, and frequency analysis, reliability analysis, descriptive statistics analysis, t-test and one-way ANOVA were performed. The results of this study are as follows. First, age-related conservatism·traditional emphasis on lifestyle, the females aged 27-29 were the highest. Second, in the case of conservatism·traditional emphasis on lifestyle according to the occupation, higher in workers than in students. Third, as a result of looking at the lifestyle according to monthly income, the aesthetic orientation was high with monthly income of 1,000,000-1,500,000 won, the social activities were high with monthly income of 300,000-500,000 won, and the social activities were high. Fourth, the difference in lifestyle pursuit according to the preferred location of purchase, e-commerce purchase preferences were higher in fashion pursuits than in store direct purchase preferences. Fifth, in e-commerce, aesthetic orientation and social activities on lifestyle according to monthly purchase costs, the aesthetic orientation and social activities were the highest among women with an e-commerce monthly purchase cost of more than 200,000 won. Sixth, the conservatism·traditional emphasis on lifestyle according to e-commerce purchase, “other” in the e-commerce purchase disadvantage had the highest. Based on the results of this study, it was possible to find out the relationship between the places where women in their twenties purchase cosmetics according to their lifestyle. This is reflected in the makeup behavior and purchase, and as an effective marketing strategy for the development of the cosmetics industry in the cosmetics industry, future research will require research by expanding the age of the study subjects.

바이오필릭디자인 요소를 적용한 친환경 오피스 계획

박세빈(Park Se Vin),최율(Choi Yool) 한국생태환경건축학회 2020 한국생태환경건축학회 학술발표대회 논문집 Vol.20 No.2

UxAS를 활용한 다수 무인기의 협력 임무점 동시도착 알고리즘 개발

박세빈(Sebeen Park),김윤근(YunGeun Kim),박재성(Jae Seong Park) 한국항공우주학회 2023 한국항공우주학회 학술발표회 논문집 Vol.2023 No.4

수직 이착륙 무인 항공기용 영상보정항법 시스템 성능평가를 위한 검증환경 개발

박세빈 ( Sebeen Park ),신현철 ( Hyuncheol Shin ),정철주 ( Chul Joo Chung ) 한국항행학회 2023 韓國航行學會論文誌 Vol.27 No.6

In this paper, we introduced a test environment to test a vision-aided navigation system, as an alternative navigation system when GPS (Global Positioning System) is unavailable, for VTOL (Vertical Take-Off and Landing) unmanned aerial system. It is efficient to use a virtual environment to test and evaluate the vision-aided navigation system under development, but currently no suitable equipment has been developed in Korea. Thus, the proposed test environment is developed to evaluate the performance of the navigation system by generating input signal modeling and simulating operation environment of the system, and by monitoring output signal. This paper comprehensively describes research procedure from derivation of requirements specifications to hardware/software design according to the requirements, and production of the test environment. This test environment was used for evaluating the vision-aided navigation algorithm which we are developing, and conducting simulation based pre-flight tests.