• 한국치위생학회지
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• 제19권2호
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• pp.287-295
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• 2019

Objectives: The purpose of this study was to investigate the factors affecting subjective oral symptoms according to the gender of youth from multi-cultural families in Korea using data from the 14th (2018) Korean Youth Health Behavior Survey. Methods: The independent variables used in this study consisted of gender and sweet drink intake. The dependent variable was experience of subjective oral symptoms. Compensation variables consisted of general characteristics of school type, academic performance, economic status, drinking status, smoking status, and number of tooth brushings day before. The subjects of the study were 835 children of multi-cultural families whose parents were foreigners. All statistical analyses were performed by complex samples cross-tabulation analysis and complex samples logistic regression analysis. Statistical analysis was performed using the PASW statistical package 21.0 (Statistical Packages for Social Science Inc., Chicago, IL, USA). A significance level of 0.05 was used for statistical significance. Results: The composite sample logistic regression analysis showed that there was a statistically significant difference between gender and intake of sweet drinks in experience of subjective oral symptoms. Conclusions: These results suggest that factors influence subjective oral symptoms in Korean multi-cultural adolescents. Therefore, I hope that they will be used as basic data for the introduction and development of a customized oral health education program for improving oral health of multi-cultural adolescents.

• 한국유기농업학회지
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• 제13권3호
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• pp.281-289
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• 2005

In order to find out an alternative way of analysis of food waste compost, the Near Infrared Reflectance Spectroscopy(NIRS) was used for the compost assessment because the technics has been known as non-detructive, cost-effective and rapid method. One hundred thirty six compost samples were collected from Incheon food waste compost factory at Namdong Indurial Complex. The samples were analyzed for nitrogen, organic matter (OM), ash, P, and K using Kjedahl, ignition method, and acid extraction with spectrophotometer, respectively. The samples were scanned using FOSS NIRSystem of Model 6500 scanning mono-chromator with wavelength from $400\~2,400nm$ at 2nm interval. Modified partial Least Squares(MPLS) was applied to develop the most reliable calibration model between NIR spectra and sample components such as nitrogen, ash, OM, P, and K. The regression was validated using validation set(n=30). Multiple correlation coefficient($R^2$) and standard error of prediction(SEP) for nitrogen, ash, organic matter, OM/N ratio, P and K were 0.87, 0.06, 0.72, 1.07, 0.68, 1.05, 0.89, 0.31, 0.77, 0.06, and 0.64, 0.07, respectively. The results of this experiment indicates that NIRS is reliable analytical method to assess some components of feed waste compost, also suggests that feasibility of NIRS can be Justified in case of various sample collection around the year.

• 지질공학
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• 제13권4호
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• pp.389-404
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• 2003

광주광역시의 하남산업단지 주변 및 도심지 광주천 일대의 37개 조사관정 중 21개 관정의 지하수에서 VOCs가 검출되었다. 염소계지방족 탄화수소는 37개 조사관정 중 18개 관정의 지하수에서 검출되었으며, 그 중 총트리할로메탄(TTHM)은 $0.1~36.2{\;}\mu\textrm{g}/L$의 분포를 보이고, CFC는 42.3~190{\;}\mu\textrm{g}/L$의 범위를 보이며, PCE, TCE 및 그 분해물들은 $0.1~124.2{\;}\mu\textrm{g}/L$의 농도를 보인다. 방향족탄화수소는 5개 관정의 지하수에서 10가지 성분이 검출되었으나, $0.2{\;}\mu\textrm{g}/L$ 미만의 낮은 농도로 나타났다. 하남산업단지 주변에서는 염소계지방족 탄화수소 성분이 광주천 인근 지하수 보다 검출빈도와 농도가 높게 나타나며, 지하수 시료중의 VOCs 성분은 TCE를 제외하고는 미국 음용수 기준치를 초과하지 않는다. TCE의 경우 하남산업단지에 소재하는 2개 지점의 지하수에서 먹는물 기준치($5{\;}\mu\textrm{g}/L$)를 각각 5배, 25배를 초과하는 것으로 나타났다 하남산업단지 지하수 시료중의 TCE 오염은 H8과 H10 관정에서, CFCs는 H8과 H11관정 부근의 지하수에서 검출되었다. 하남산업단지 주변 및 광주천 일대에서 검출된 TTHM은 상수도 및 하수도의 누출로부터 기원하는 것으로 판단된다. 연구 대상지역은 일부지역을 제외하고는 호기성지대로 구성되어 대부분의 방향족탄화수소는 분해가 잘되는 환경이나 염소계지방족 탄화수소는 대부분 생분해 반응이 서서히 일어나는 환경에 해당한다.

• 한국환경보건학회지
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• 제42권6호
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• pp.409-418
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• 2016

Objectives: The purpose of this study was to characterize penicillin G resistant bacteria in surface water from pharmaceutical complex effluent. Methods: Surface water was sampled from pharmaceutical complex effluent in Gyeonggi-do Province, Korea in March 2015. Water samples were plated in triplicate on tryptic soy agar plates with 32 mg/L of penicillin G. Penicillin G resistant bacteria were selected from the effluent and subjected to 16S rRNA analysis for the penicillin G resistant species determination. Identified resistant strains were tested for resistance to various antibiotics. Results: Penicillin G resistant bacteria were present at 8.0% in terms of culturable heterotrophic bacteria. Identified penicillin G resistant bacteria exhibited resistance to more than nine of the antibiotics studied. These resistant bacteria are gram negative and are closely related to pathogenic species. Conclusion: Multi-antibiotic resistant bacteria in the surface water of pharmaceutical complex effluent suggest the need for disinfection and advanced oxidation processed for pharmaceutical effluent.

• Journal of Ecology and Environment
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• 제34권3호
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• pp.323-331
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• 2011

Biodiversity and the community composition of micro-eukaryotic organisms were investigated in the Upo wetland in Korea using molecular analysis. Molecular identification was performed using cytochrome oxidase I (COI) and small subunit ribosomal DNA (SSU rDNA). The genomic DNA was isolated directly from soil samples. The COI and SSU rDNA regions were amplified using universal primers and then sequenced after cloning. In a similarity search of the obtained sequences with BLAST in the Genbank database, the closely related sequences from NCBI were used to identify the amplified sequences. A total of six eukaryotic groups (Annelida, Arthropoda, Rotifera, Chlorophyta, Bacillariophyta, and Stramenopiles) with COI and six groups (Annelida, Arthropoda, Rotifera, Alveolata, Fungi, and Apicomplexa) with SSU rDNA genes were determined in the Upo wetland. Among 38 taxa in 20 genera, which are closely related to the amplified sequences, 10 genera (50%) were newly reported in Korea and five genera (25%) were shown to be distributed in the Upo wetland. This approach is applicable to the development of an efficient method for monitoring biodiversity without traditional taxonomic processes and is expected to produce more accurate results in depositing molecular barcode data in the near future.

• 지역사회간호학회지
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• 제27권2호
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• pp.106-113
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• 2016

Purpose: The purpose of this study was to determine the relationship between unhealthy eating behavior and depression in adolescents, with confounding variables adjusted. Methods: This study is a secondary analysis of the data collected from the 2013 Korean Youth Risk Behavior Web-based Survey (KYRBWS). The analysis included 72,435 participants (36,655 male and 35,780 female). The data were analyzed by $x^2$ test, t-test, and logistic regression analysis using SPSS Version 21 by complex samples analysis. Results: Compared with male adolescents with healthy eating behavior, those who with unhealthy eating behavior were more likely to suffer depression with other factors controlled (OR=1.37, 1.07~1.75). On the other hand, female adolescents with unhealthy eating behavior were less likely to feel depressed compared with female adolescents with unhealthy eating behavior and with other factors controlled (OR=0.98, 0.64~1.50). However, it was not statistically significant. Conclusion: Our findings suggest that healthy eating behavior may be a protective factor against depression in male adolescents, but not in female adolescents. Furthermore, our results suggest that the longitudinal associations between mental health and healthy eating behavior and other lifestyle factors are complex.

• 융합정보논문지
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• 제11권1호
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• pp.199-207
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• 2021

본 연구는 제15차(2019) 청소년건강행태온라인조사 자료를 이용하여 우리나라 청소년의 폭력 피해 경험이 흡연에 미치는 영향을 파악하기 위해 시도되었다. 연구 대상자는 57,303명이었고, 자료는 SPSS / Win 26.0 프로그램을 이용하여 복합표본 빈도분석, 복합표본 교차분석(Rao-Scott ��2 test), 복합표본 로지스틱 회귀분석을 실시하였다. 주요 결과는 흡연을 하는 대상자는 전체의 12.7% 이었다. 흡연을 하는 대상자는 폭력 피해 경험 3회 이상이 1~2회나 없는 대상자에 비해 각 각 9.6%, 22.0% 유의하게 더 많았다. 성별, 학년, 학업 성취, 경제 상태, 음주 여부, 가족 동거 여부 및 평소 스트레스 인지 정도를 보정한 우리나라 청소년의 흡연은 폭력 피해 경험 정도가 1단위 증가할 때 흡연할 오즈비가 1.66배 증가하였다. 이상의 결과로 청소년의 폭력 피해 경험 정도가 높아질수록 흡연할 가능성을 높이므로 청소년의 폭력을 예방하고 관리하는데 보다 많은 관심을 가지고, 청소년 흡연을 감소시키기 위한 다학제간 융합적 노력이 필요하다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제12권10호
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• pp.4814-4834
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• 2018

This paper presents an architecture for wireless sensor networks (WSNs) with blind source separation (BSS) applied to retrieve the received mixing signals of the sink nodes first. The little-to-no need of prior knowledge about the source signals of the sink nodes in the BSS method is obviously advantageous for WSNs. The optimization problem of the BSS of multiple independent source signals with complex and noncircular distributions from observed sensor nodes is considered and addressed. This paper applies Castella's reference-based scheme to Novey's negentropy-based algorithms, and then proposes a novel fast fixed-point (FastICA) algorithm, defined as the reference-signal negentropy complex FastICA (RSNT-cFastICA) for complex-valued noncircular-distribution source signals. The proposed method for the sink nodes is substantially more efficient than Novey's quasi-Newton algorithm in terms of computational speed under large numbers of samples, can effectively improve the power consumption effeciency of the sink nodes, and is significantly beneficial for WSNs and wireless communication networks (WCNs). The effectiveness and performance of the proposed method are validated and compared with three related BSS algorithms through theoretical analysis and simulations.

• Nuclear Engineering and Technology
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• 제42권2호
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• pp.163-174
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• 2010

As pointed out in the OECD BEMUSE Program, when a high computation time is taken to obtain the relevant output values of a complex physical model (or code), the number of statistical samples that must be evaluated through it is a critical factor for the sampling-based uncertainty analysis. Two alternative methods have been utilized to avoid the problem associated with the size of these statistical samples: one is based on Wilks' formula, which is based on simple random sampling, and the other is based on the conventional nonlinear regression approach. While both approaches provide a useful means for drawing conclusions on the resultant uncertainty with a limited number of code runs, there are also some unique corresponding limitations. For example, a conclusion based on the Wilks' formula can be highly affected by the sampled values themselves, while the conventional regression approach requires an a priori estimate on the functional forms of a regression model. The main objective of this paper is to assess the feasibility of the ACE-RSM approach as a complementary method to the Wilks' formula and the conventional regression-based uncertainty analysis. This feasibility was assessed through a practical application of the ACE-RSM approach to the LOFT L2-5 LBLOCA PCT uncertainty analysis, which was implemented as a part of the OECD BEMUSE Phase III program.

• 한국약용작물학회지
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• 제26권4호
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• pp.302-307
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• 2018

Background: A soil-borne pathogenic fungus, Ilyonectria radicicola (Cylindrocarpon destructans) causes root rot on ginseng (Panax ginseng C. A. Meyer) and is known to attack many other plants. The Nectria/Neonectria radicicola complex has been renamed as the I. radicicola complex after analysis of its multi-gene relatedness and morphological characteristics. The fungi in this complex have been reclassified into 16 species under the genus Ilyonectria based on characteristics analysis Methods and Results: To obtain useful data from the Korean ginseng root rot, I. radicicola was isolated from the rhizosphere soils of the chestnut tree. They were identified through a pathogenicity test and a survey of the morphological features. The existence of I. radicicola in soil samples was confirmed by PCR detections using nested PCR with species-specific primer sets. These were subsequenctly isolated on semi-selective media from PCR-positive soils. Genetic analysis of the I. radicicola complex containing these pathogens was done by comparing the DNA sequences of the histone h3 region. These isolates originating from the rhizosphere soils of chestnut constituted a clade with other closely related species or I. radicicola isolates originating from ginseng or other host plants, respectively. Additionally, the pathogenicity tests to analyze the characteristics of these I. radicicola isolates revealed that they caused weakly virulent root rot on ginseng. Conclusions: This is the first study reporting that I. radicicola isolates from chestnut rhizosphere soils can attack ginseng plant in Korea. Thus, these results are expected to provide informations in the selection of suitable fields for ginseng cultivation.