ACF 흡착관 개발을 위한 파과특성에 관한 연구

원정일(Jung-Il Won),김기환(Ki-Hwan Kim) 대한환경위생공학회 2005 대한환경위생공학회지 Vol.20 No.1

This dissertation aims to develop adsorption tubes for measuring organic solvents in the working environment, by comparing and analyzing breakthrough condition and adsorption capacity with ACF.<br/> 1. In breakthrough characteristics, the raising velocity of breakthrough curve is increasing according to assault concentration, but 50% breakthrough time is decreasing. As breakthrough curve of calculated data using this agrees with the one of experimental data both of them can be used on determining sampling time of adsorption tubes. It is predicted by theoretical that 10% breakthrough time is increasing in the case of increasing filled adsorbent amount.<br/> 2. 10% breakthrough time is regularly decreasing as much as assault concentration is increasing. As a result, we can predict the life of adsorbent within the range of the low concentration, and adsorption amount that ACF can sample during 10% breakthrough time is increasing as much as assault concentration is increasing.

트라이 인덱스를 이용한 DNA 시퀀스 검색

원정임(Jung-Im Won),박용일(Yong-Il Park),윤지희(Jee-Hee Yoon),박상현(Sang-Hyun Park) 한국정보과학회 2003 한국정보과학회 학술발표논문집 Vol.30 No.2Ⅱ

본 논문에서는 대규모 DNA 시퀀스를 위한 트라이 인덱싱 기법을 기반으로 하는 효율적인 부분 시퀀스 검색 기법을 제시한다. 제안된 인덱싱 방안에서는 저장 공간 감소를 위하여 시퀀스의 각 문자를 최소 비트 정보로 표현하며, 저장 구조로서 포인터를 사용하지 않는 디스크 기반의 이진 접미어 트라이 구조를 사용한다. 질의 처리 방안에서는 포인터가 없는 이진 트라이 구조상에서 질의 시퀀스를 검색하기 위하여 이진 정보 기반의 연산과정을 필요로 하며, 또한 단말 정보를 효율적으로 검색하기 위하여 별도의 단말정보 테이블과 인덱스 구조를 사용한다. 실험 결과에 의하면 제안된 방식은 기존의 접미어 트리 인덱싱 방식에 비하여 약 30-50%의 저장 공간 감소 효과를 가질 뿐 아니라, 평균 질의 처리 시간에 있어 약 20배까지의 성능 개선 효과를 갖는 것으로 나타났다.

Effects of Waterlogging Stress on Growth Characteristics and Recovery in Astragalus membranaceus Bunge.

Jung Yeon Won(원정연),Yong Il Kim(김용일),Eun song Lee(이은송),Kyung Sook Han(한경숙),Yong Goo Kim(김용구) 한국약용작물학회 2023 한국약용작물학회 학술대회논문집 Vol.2023 No.1

작업환경측정기관 근로자의 직업 만족도 영향 요인 분석

양원호 ( Won Ho Yang ),김치년 ( Chi Nyon Kim ),김태형 ( Tae Hyeung Kim ),노영만 ( Young Man Roh ),심상효 ( Sang Hyo Sim ),원정일 ( Jung Il Won ),이채관 ( Chae Kwan Lee ),정광호 ( Kwang Ho Chung ),정지연 ( Jee Yeon Jeong ),조기홍 ( 한국산업위생학회 2013 한국산업보건학회지 Vol.23 No.2

Objectives: This study was performed in order to investigate by questionnaire the factors affecting the occupational satisfaction of work-environment measurement workers, as well as to suggest fundamental materials for systematic, administrative and economic improvements which are necessary to create a vision for the future. Material and Methods: A structured questionnaire was used at a total of 152 institutions and 1,254 work-environment measurement workers throughout the country from February to September 2012. Responses came from 97 institutions (64%) and 941 work-environment measurement workers (75.1%). The factors affecting the job satisfaction of work-environment measurement workers were statistically evaluated through χ 2 -test and ordinal logistic regression analysis. Results: Major factors affecting the job satisfaction of workers in relation to work-environment measurement were working, financial, and psychological conditions (p<0.05). Conclusions: Considering the results of this study, the improvement of labor conditions should be undertaken because workers engaged in work-environment measurement are fundamental to occupational health.

한우에서 분만난이도에 대한 유전모수 추정

김대중 ( Dae Jung Kim ),원정일 ( Jeong Il Won ),조충일 ( Chung Il Cho ) 한국축산학회(구 한국동물자원과학회) 2021 동물자원연구 Vol.32 No.2

This study evaluated genetic parameters of direct and maternal effects for calving ease in Hanwoo. A total of 2,102 records for calving ease were collected from 2018 to 2020 from the Hanwoo Genetic Improvement Center in Korea. The calving ease score was rated from 1 to 4 (1=unassisted delivery, 2=assisted easy calving, 3=assisted difficult calving, 4=mechanical or caesarean section) as categorical data, and the data were converted using a truncated normal distribution for linear model analysis. To evaluate the genetic parameters, the birth year-season of calving, the sex of the calf, parity, and the age of the dam at calving were considered as fixed effects, and genetic and maternal effects were considered random effects. The genetic parameters were evaluated using the program BLUPF90. The calving ease scores for male calves, first parity cows, and currently calving cows were much higher than for females, later parities, and past calving cows. The direct genetic variance (0.0164) was higher than the maternal genetic variance (0.0018), and the estimated heritabilities of the direct and maternal effects were 0.055 and 0.006, respectively. The parameters determined here should help with the genetic evaluation of calving ease in Hanwoo.

영역 질의의 효과적인 처리를 위한 궤적 인덱싱

차창일,김상욱,원정임,Cha, Chang-Il,Kim, Sang-Wook,Won, Jung-Im 한국정보처리학회 2009 정보처리학회논문지D Vol.16 No.4

This paper addresses an indexing scheme capable of efficiently processing range queries in a large-scale trajectory database. After discussing the drawbacks of previous indexing schemes, we propose a new scheme that divides the temporal dimension into multiple time intervals and then, by this interval, builds an index for the line segments. Additionally, a supplementary index is built for the line segments within each time interval. This scheme can make a dramatic improvement in the performance of insert and search operations using a main memory index, particularly for the time interval consisting of the segments taken by those objects which are currently moving or have just completed their movements, as contrast to the previous schemes that store the index totally on the disk. Each time interval index is built as follows: First, the extent of the spatial dimension is divided onto multiple spatial cells to which the line segments are assigned evenly. We use a 2D-tree to maintain information on those cells. Then, for each cell, an additional 3D $R^*$-tree is created on the spatio-temporal space (x, y, t). Such a multi-level indexing strategy can cure the shortcomings of the legacy schemes. Performance results obtained from intensive experiments show that our scheme enhances the performance of retrieve operations by 3$\sim$10 times, with much less storage space. 본 연구에서는 대용량 궤적 데이터베이스에서 영역 질의를 효과적으로 처리하기 위한 인덱싱 기법에 대하여 논의한다. 먼저, 기존 인덱싱기법의 문제점을 지적하고, 이러한 문제점을 해결하는 새로운 기법을 제안한다. 제안된 기법에서는 우선 시간 차원을 다수의 시간 구간으로 분할하고, 인덱싱의 대상이 되는 전체 라인 세그먼트들을 시간 구간별로 구분한다. 각 시간 구간에 속하는 라인 세그먼트들에 대하여 별도의 인덱스를 구축한다. 또한, 디스크에서 관리되는 과거 시간 구간에 대한 인덱스들과는 달리 최근 시간 구간에 대한 인덱스는 메인 메모리상에 관리함으로써 삽입과 검색의 성능을 크게 개선할 수 있다. 각 시간 구간에 속하는 라인 세그먼트들은 다음과 같은 방식으로 인덱스를 구축한다. 먼저, 2D-트리를 이용하여 전체 공간 차원을 유사한 수의 라인 세그먼트들이 배정되도록 다수의 셀들로 분할한다. 또한, 분할된 각 셀마다 시공간 차원 (x, y, t)에 대한 별도의 3차원 $R^*$-트리를 두어 보다 상세한 인덱싱을 지원한다. 이와 같은 다양한 전략을 이용함으로써 기존 기법의 문제점들을 해결 할 수 있다. 다양한 실험을 통하여 제안된 기법의 우수성을 정량적으로 검증한다. 실험 결과에 의하면, 기존 기법에 비하여 작은 인덱스 구조를 갖으면서도 검색 성능면에서 3$\sim$10배까지의 성능 향상 효과를 갖는 것으로 나타났다.

대용량 궤적 데이터를 위한 효과적인 인덱싱 기법

차창일 ( Chang-il Cha ),원정임 ( Jung-im Won ),김상욱 ( Sang-wook Kim ) 한국정보처리학회 2008 한국정보처리학회 학술대회논문집 Vol.15 No.1

본 연구에서는 대용량 궤적 데이터베이스에서 영역 질의를 효과적으로 처리하기 위한 인덱싱 기법에 대하여 논의한다. 먼저, 기존 인덱싱 기법의 문제점을 지적하고, 이러한 문제점을 해결하는 새로운 기법을 제안한다. 제안된 기법에서는 우선 시간 차원을 다수의 시간 구간으로 분할하고, 인덱싱의 대상이 되는 전체 라인 세그먼트들을 시간 구간별로 구분한다. 각 시간 구간에 속하는 라인 세그먼트들에 대하여 별도의 인덱스를 구축한다. 또한, 디스크에서 관리되는 과거 시간 구간에 대한 인덱스들과는 달리 최근 시간 구간에 대한 인덱스는 메인 메모리상에 관리함으로써 삽입과 검색의 성능을 크게 개선할 수 있다. 각 시간 구간에 속하는 라인 세그먼트들은 다음과 같은 방식으로 인덱스를 구축한다. 먼저, 2D-트리를 이용하여 전체 공간 차원을 유사한 수의 라인 세그먼트들이 배정되도록 다수의 셀들로 분할한다. 또한, 분할된 각 셀마다 시공간 차원 (x, y, t)에 대한 별도의 3차원 R*-트리를 두어 보다 상세한 인덱싱을 지원한다. 실험 결과에 의하면, 기존 기법에 비하여 작은 인덱스 구조를 갖으면서도 검색 성능면에서 300%~1000%까지의 성능 향상 효과를 갖는 것으로 나타났다.

작업환경측정 시료 채취기의 부착 위치에 따른 유기화합물의 농도 분포에 관한 연구

권영규 ( Yung Gyu Kwon ),원정일 ( Jung Il Won ),장형석 ( Hyung Seok Jang ),심상효 ( Sang Hyo Sim ) 한국산업보건학회 2015 한국산업보건학회지 Vol.25 No.3

Objectives: The purpose of this study is to investigate differences in concentration according to the position at the left or right shoulder within a 30 cm of radius of workers’ respirators and provide basic data for the establishment of an industrial health policy. Methods: Personal samples were collected from a total of 65 workers from 27 manufacturing firms in South Gyeongsang-do Province from November 5, 2011 to December 30, 2012 after classifying the laborers into left- and right-side groups. The organic compound samples were collected and analyzed in accordance with the NIOSH Manual of Analytical Methods (NMAM) 1501. Results: In terms of the concentration of organic compounds collected from both left and right shoulders at the position of workers’ respirators, isobutyl acetate was the highest with 145 ppm at the left shoulder, followed by ethyl acetate (133.5 ppm) and toluene (38.13 ppm). At the right shoulder, on the contrary, ethyl acetate (149.3 ppm) was the highest, followed by toluene (46.26 ppm), xylene (29.63ppm) and isopropyl alcohol (28.06 ppm). Overall, the right shoulder was higher than the left shoulder in terms of concentrations. Conclusions: For the measurement of the working environment, workers’ personal samples should be collected at the place closest to the respirator. In terms of the reduction of error, the attachment of two sample media is expected to reduce errors in exposure assessment.

Yoon과 Nelson의 흡착모델을 이용한 방독마스크 정화통의 수명예측(1)

김기환 ( Ki Hwan Kim ),원정일 ( Jung Il Won ) 한국산업위생학회 2008 한국산업보건학회지 Vol.18 No.1

A respirator is useful to protect a worker from the harmful gases and vapors in the workplace, and the evaluation of respirator cartridge service life is important for the worker`s health and safety. The performance of cartridge is effected by several factors such as concentration of gas and vapor, humidity, temperature, adsorbents and cartridge packing density. Adsorption model was applied to both sampling tube and respirator cartridge to predict the service life for organic vapors. The variables of the adsorption model were measured from the experiment with the sampling tube, and it was used to predict the service life of respirator cartridge. In the experiment, we used carbon tetrachloride as a organic vapor and activated carbon take out respirator cartridge as activated carbon. As a result, it was possible to predict the service life of respirator cartridge and predicted service life was quite correct. Breakthrough time decreased with increase of CCl4 concentration. In case of sampling tube, adsorbed amount of CCl4 was larger than respirator cartridge due to linear velocity. Also, rate constant of sampling tube was larger than respirator cartridge, because of, effect of flow rate, packing density. In the prediction of service life of respirator cartridge by using sampling tube, the time required for 50% contaminant breakthrough(τ) is more effective than the rate constant(k`).

경증의 간 기능 이상 소견을 보이는 성인에 대한 동충하초 추출물의 기능 및 안전성

허진영 ( Jin Young Heo ),백현욱 ( Hyun Wook Baik ),김혁중 ( Hyuk Jung Kim ),이재민 ( Jae Min Lee ),김형우 ( Hyung Woo Kim ),최용선 ( Yong Sun Choi ),원정호 ( Jung Ho Won ),김현미 ( Hyun Mi Kim ),박원일 ( Won Il Park ),김철영 ( Chu 한국정맥경장영양학회 2015 한국정맥경장영양학회지 Vol.7 No.3

Purpose: The aim of this study is to determine the efficacy and safety of Cordyceps militaris in Korean adults with mild liver dysfunction. C. militaris is a mushroom traditionally used for several clinical purposes in East Asian territory, including China, and has been found to be effective in improving liver function through animal studies. Methods: The C. militaris group was administered 1.5 g/day of C. militaris (2 capsules per dose, twice per day) and the placebo group was administered the same volume of placebo. Laboratory test (white blood cell, hemoglobin, platelet, aspartate aminotransferase, alanine aminotransferase, gamma glutamyltranspeptidase, lactic dehydrogenase, alkaline phosphatase, total bilirubin, blood urea nitrogen, creatinine), liver computed tomography (CT) were performed, and visual analogue scale score for subjective symptoms and fatigue severity scale were measured. Results: In analysis of the liver CT scan at 8 weeks after administration compared to baseline, the mean ratio of change of Hounsfield unit of 8 segments of liver increased by an average of 21.43%±45.11% in the C. militaris group and 9.64%±11.41% in the placebo group. Others showed no statistically significant inter-group difference. Conclusion: C. militaris extract was used safely as a functional food in patients with mild liver dysfunction, and is expected to protect against progression of fatty liver or cirrhosis caused by suppression of lipid accumulation in hepatocytes.