사용자 구분에 의한 지역적 연관규칙의 유도 (pp.53-64)

박세일(Seil Park),이수원(Soowon Lee) 한국정보과학회 2002 정보과학회논문지 : 소프트웨어 및 응용 Vol.29 No.1·2

Association rule discovery is a method that detects associative relationships between items or attributes in transactions. It is one of the most widely studied problems in data mining because it offers useful insight into the types of dependencies that exist in a data set. However, most studies on association rule discovery have the drawback that they can not discover association rules among user groups that have common characteristics. To solve this problem, we segment the set of users into user-subgroups by using feature selection and the user segmentation, thus local association rules in each user-subgroup can be discovered. To evaluate that the local association rules are more appropriated than the global association rules in each user-subgroup, derived local association rules are compared with global association rules in terms of several evaluation measures. 연관규칙 탐사기법은 트랜잭션들을 대상으로 항목간 또는 속성간의 연관관계를 발견하는 방법으로, 데이타 집합의 구조를 쉽게 통찰할 수 있다는 장점으로 인하여 활발히 연구되어 왔다. 그러나 현재까지의 연구들은 전체 사용자 중 공통적인 특성을 지닌 사용자 그룹이 존재할 경우, 그러한 그룹별 연관 규칙을 찾아낼 수 없다는 한계점을 지닌다. 본 논문에서는 이러한 점을 해결하기 위하여, 속성선택 및 사용자 구분 기법을 이용하여 사용자를 부분집합으로 구분하고 그 부분집합별로 연관규칙을 발견한다. 또한 위와 같이 얻어진 지역적 연관규칙이 전체 사용자를 대상으로 한 전역적 연관규칙보다 해당 부분집합에 더욱 적합하다는 사실을 여러 연관규칙 평가치를 이용하여 평가한다.

시간-주파수 분석 기반 레이저 펄스 시스템의 전압 구간별 적합도 평가

박세일(Seil Park),지경환(Gyeong Hwan Ji),신용준(Yong-June Shin) 대한전기학회 2021 대한전기학회 학술대회 논문집 Vol.2021 No.10

케이블 진단 기술인 시간-주파수 영역 반사파 계측법 (TFDR: Time-Frequency Domain Reflectometry)은 케이블 내에서 발생한 반사파를 시간-주파수 분석을 통해 결함 진단을 하는 기술이다. 그러나 레이저 신호는 생성 과정에서 광원의 비선형성에 의한 신호 왜곡을 경험하기 때문에, 주파수 영역에서 정교하게 설계된 진단 신호가 필요한 시간-주파수 영역 반사파 계측법을 광케이블 진단에 적용하는 것이 어려운 실정이다. 본 연구에서는 왜곡된 주파수 성분을 가진 레이저 신호의 시간-주파수 영역 분포와 그 분포의 상호 상관 함수를 통해 특정 전압 구간에서 동작하는 레이저 신호 생성 시스템의 성능을 평가한다. 해당 평가 방식은 시스템의 신호 왜곡을 최소화하는 최적의 전압 구간을 찾아 시간-주파수 영역 반사파 계측법을 광케이블 진단에 활용하는 데에 기여할 수 있을 것으로 생각된다.

승용차량에 대한 경트럭 및 SUV의 공격성 연구

박인송(Insong Park),김관희(Guanhee Kim),박세일(Seil Park) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

In car to car crash test, smaller and lighter vehicle is considered to be weaker than bigger and heavier vehicle. Generally, SUVs and Light Truck Vehicles(LTVs) are bigger and heavier than passenger vehicles and their drive height and front end stiffness are higher than passenger vehicles. Because of these characteristics SUVs and LTVs cause more severe injury and fatal injury to passenger vehicle at head-on impact. To evaluate SUV and LTV's aggessivity to passenger vehicle, we carried out SUV to passenger vehicle and LTV to passenger vehicle head-on crash test. And finally the way how to reduce incompatibility between SUV and LTV and passenger vehicles is suggested.

Intelligent Transport Data Collection Strategy in Software Defined Edge Vehicular Network

Lionel Nkenyereye,Minyoung Kim(김민영),Seil Park(박세일),Jong-Wook Jang(장종욱) 한국통신학회 2019 한국통신학회 학술대회논문집 Vol.2019 No.1

Software Defined Network (SDN) and edge computing are emerging technologies in information and communication technology to minimize data collection latency on the Internet of Vehicles (IoV). The car has the potential to contribute to the development of smart cities by accessing urban data that are collected and reported to a remote data centers through wireless communication This paper presents the study on intelligent transport data collection strategy in a Software- Defined Edge vehicular networking. The two sensing data collection schemes are cooperative vehicular and edge prediction mode based Software Defined Vehicular Network (SDVN). We prove that urban data collection cost through a novel algorithm called car sensing platform for urban data collection algorithm to find an optimal strategy. We set up a simulation scenario based on realistic traffic and communication features and demonstrate the scalability of the proposed intelligent transport data collection strategy. It can be seen that the edge cell predictive trajectory decision-based SDEVN mode scheme reduces greatly the cost when the road seems to have a high number of the vehicle.

광주지역 신축아파트의 휘발성유기화합물 및 카보닐화합물 특성에 관한 연구

김환기(Hwangi Kim),안상수(Sangsu Ahn),박옥현(Okhyun Park),김민진(Minjin Kim),이우진(Woojin Lee),박세일(Seil Park),배석진(Seokjin Bae),서광엽(Gwangyeob Seo) 한국생활환경학회 2021 한국생활환경학회지 Vol.28 No.2

Numerous volatile organic compounds are generated in new apartments. Only six volatile substances are regulated under the Indoor Air Quality Management Act for new apartments. Various other substances are not regulated despite their potential health risks. We investigated 43 types of volatile organic compounds and 7 types of carbonyl compounds which are representative indoor environmental pollutants in new apartments, and 21 types of pollutants were detected. Of the 21 types detected, 91.6 percent accounted for the majority of the 7 species with high concentrations. These seven typical indoor pollutants include regulators Toluene, Formaldehyde, Ethyl-benzene, Xylene, and Styrene, as well as unregulated substances Acetone and Acetaldehyde. The correlation analysis among seven volatile organic compounds was investigated. For the correlation of seven species, the strongest positive correlation between Ethyl-benzene and Styrene r=.933 (p=.001) appeared, and a coefficient of determination(r) between other species was greater than 0.7. This correlation coefficient values indicated that several volatile organic compounds released from the same pollutant sources. Additionally the concentration reduction rate of volatile organic compounds was measured to examine the Bakeout effect. The reduction rate scored as Toluene 85.5%, Xylene 84.7%, Ethyl-benzene 84.4%, Styrene 76.8%, Acetone 73.4%, Acetaldehyde 71.0%, and Formaldehyde 70.9% respectively.

광주지역 지하수 중 우라늄과 라돈의 함량 분포 특성

서희정(Heejeong Seo),민경우(Kyoungwoo Min),박지영(Jiyoung Park),박주현(Juhyun Park),황호연(Hoyeon Hwang),박세일(Seil Park),김선정(Seonjeong Kim),정숙경(Sukkyung Jeong),배석진(Seokjin Bae),김성준(Seongjun Kim) 한국환경보건학회 2022 한국환경보건학회지 Vol.48 No.2

Background: As high concentrations of uranium and radon have been detected in some areas in Korea, it is considered necessary to investigate natural radioactive materials in the Gwangju area. Objectives: This study aimed to identify the hydrochemical characteristics of groundwater in Gwangju and investigate the distribution characteristics of uranium and radon, which are naturally radioactive substances. Methods: To determine the uranium and radon concentrations in groundwater according to the geology of the Gwangju area, we measured 62 groundwater wells. A geological distribution map of uranium and radon content was prepared for this study. Results: The groundwater type, defined using a Piper diagram, was mainly Ca-HCO3. The concentration of uranium in the groundwater ranged from 0 to 29.3 µg/L, with a mean of 3.3 µg/L and a median of 0.9 µg/L. The median concentration of uranium in groundwater was highest in alluvium, granitic gneiss, and biotite granite (classified by geological unit), in that order. The concentration of radon in the groundwater ranged from 4.8 to 313.2 Bq/L, with a mean of 75.6 Bq/L and a median of 59.6 Bq/L. The median concentration of radon in groundwater was highest in biotite granite, alluvium, and granitic gneiss, in that order. As a result of the correlation analysis of groundwater in the study area, there was no significant correlation between uranium and radon. Conclusions: In this study area, uranium was shown to be far below the concentrations allowed by drinking water quality standards, but radon concentrations exceeded drinking water quality monitoring standards in 11% of the samples. It was judged that appropriate measures, such as the installation of radon reduction facilities, will be required after a thorough review of high-concentration radon detection sites of in the research area.

신축공동주택 실내 휘발성유기화합물의 농도분포 조사

김환기(Hwangi-Kim),안상수(Sangsu-An),박옥현(OkHyun-Park),김민진(Minjin-Kim),이우진(Woojin-Lee),박세일(Seil-Park),서광엽(Gwang-yeob-Seo) 대한환경공학회 2020 대한환경공학회 학술발표논문집 Vol.2020 No.11

청소년기의 웨이트 트레이닝이 체력변화에 미치는 영향

박세일,박진성,김기진 啓明大學校 生活科學硏究所 2002 科學論集 Vol.28 No.-

This study analyzes the influence of a weight training program on the physical fitness in adolescent students. The subjects are 30 teen-aged male students, who are assigned to two groups, as weight training group(N=15) and control group(N=15). The measurement of the I measured physical fitness factors by 6 items conducted before and after weight training. The measured datum show the following conclusion as result of conduction 2-way repeated ANOVA that deals groups and the period time of measurement as a separate factor. Because the trained group shows a significant(p<0.01) higher results when compared to the control group after weight training in standing broad of long jump, push-up, sit-up, and 1600m running, it is considered the remarkable training effect. But 50m running record showed no difference between two groups after weight training. In trunk flexion with sitting, the measurement item of flexibility, all of the two groups show the same tendency of meaningfully(p<0.05) improving, so it is considered that there is no difference producted by the training effect. The above mentioned results enable the weight training of the adolescent period to be proposed as an effective method to the improvements of physical fitness except flexibility, and it is believed that in afterward study we will have a more distinct result through the application which considers the appropriateness of training period and training items.