• 한국지하수토양환경학회:학술대회논문집
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• 한국지하수토양환경학회 2003년도 추계학술발표회
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• pp.91-94
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• 2003

A field pilot-scale demonstration of an enhanced SVE using hot air injection and extraction was conducted to remove diesel range compounds from subsurface soils at a site in J-city, Korea. The objective of demonstration was to evaluate field ISR by intrinsic microorganism after an application study of hot air-SVE technology and to calculate each first-order kinetic with soil temperature. TPH concentration of contaminated soil at the site was approximately 2, 000~11, 000 mg/kg (average 6, 900 mg/kg) with depths greater than 5 m bgs. The 1st-order reaction rate constants, k were 0.0438(@about5$0^{\circ}C$), 0.0564(@4$0^{\circ}C$), and 0.0685(@33$^{\circ}C$) d-1 respectively.

• 품질경영학회지
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• 제51권4호
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• pp.551-571
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• 2023

Purpose: The purpose of this study is to propose useful suggestions by analyzing the causal effect relationship between the failure rate of quality and the process variables in the C5ISR domain of the defense industry. Methods: The collected data through the in house Systems were analyzed using Big data analysis. Data analysis between quality data and A/S history data was conducted using the CRISP-DM(Cross-Industry Standard Process for Data Mining) analysis process. Results: The results of this study are as follows: After evaluating the performance of candidate models for the influence of inspection data and A/S history data, logistic regression was selected as the final model because it performed relatively well compared to the decision tree with an accuracy of 82%/67% and an AUC of 0.66/0.57. Based on this model, we estimated the coefficients using 'R', a data analysis tool, and found that a specific variable(continuous maximum discharge current time) had a statistically significant effect on the A/S quality failure rate and it was analysed that 82% of the failure rate could be predicted. Conclusion: As the first case of applying big data analysis to quality issues in the defense industry, this study confirms that it is possible to improve the market failure rates of defense products by focusing on the measured values of the main causes of failures derived through the big data analysis process, and identifies improvements, such as the number of data samples and data collection limitations, to be addressed in subsequent studies for a more reliable analysis model.

• 한국통신학회논문지
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• 제32권12B호
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• pp.767-778
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• 2007

본 논문에서는 스마트 홈 환경에서 데이터 마이닝 기법을 이용하여 사용자에게 상황에 적합한 서비스를 추론하는 모델을 제안한다. 의사결정트리 알고리즘들 중에 하나인 C4.5 알고리즘을 기반으로 서비스 추론에 쓰이는 서비스 트리를 생성하고, 정량적 특성 규칙과 정량적 판별 규칙을 이용하는 정량적 가중치 산정 알고리즘을 통해 사용자에게 제공될 서비스를 추론한다. 또한 시뮬레이션을 통해 그 성능을 검증하였다.

• Mycobiology
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• 제30권1호
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• pp.31-36
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• 2002

Soil bacteria were screened for the ability to control cucumber anthracnose caused by Colletotrichum orbiculare through induced systemic resistance(ISR). Sixty-four bacterial strains having in vitro antifungal activity were used for selecting ISR-inducing strains in cucumber. Cucumber seeds(cv. Baeknokdadagi) were sown in potting mixtures incorporated with the soil bacteria, at a rate of ca. $10^8$ cells per gram of the mixture. Two week-old plants were then transplanted into the steam-sterilized soil. Three leaf-stage plants were inoculated with a conidial suspension($5{\times}10^5$ conidia/ml) of C. orbiculare. Diseased leaf area(%) and number of lesions per $cm^2$ leaf were evaluated on third leaves of the plants, $5{\sim}6$ days after inoculation. Among 64 strains tested, nine strains, GC-B19, GC-B35, GK-B18, MM-B22, PK-B14, RC-B41, RC-B64, RC-B65, and RC-B77 significantly(P=0.05) reduced anthracnose disease compared to the untreated control. In contrast, some bacterial strains promoted susceptibility of cucumber to the disease. From the repeated experiments using the nine bacterial strains, GC-B19, MM-B22, PK-B14, and RC-B65 significantly(P=0.05) reduced both diseased leaf area(%) and number of lesions per $cm^2$ leaf in at lease one experiment. These strains with control efficacy of $37{\sim}80%$ were determined to be effective ISR-inducing strains.

• 한국식물병리학회:학술대회논문집
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• 한국식물병리학회 2003년도 정기총회 및 추계학술발표회
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• pp.90.1-90
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• 2003

Colonization of Pseudomonas chlororaphis O6, a nonpathogenic rhizobacterium, on the roots induced systemic resistance in cucumber plants against tai-get leaf spot, a foliar disease caused by Corynespora cassiicola. A cDNA library was constructed using mRNA extracted from the cucumber leaves 12 h after inoculation with C. cassiicola, which roots had been previously treated with O6. To identify the genes involved in the O6-mediated induced systemic resistance (ISR), we employed a subtractive hybridization method using mRNAs extracted from C cassiicola-inoculated cucumber leaves with and without previous O6 treatment on the plant roots. Differential screening of the cDNA library led to the isolation of 5 distinct genesencoding a GTP-binding protein, a putative senescence-associated protein, a galactinol synthase, a hypersensitive-induced reaction protein, and a putative aquaporin. Expressions of these genes are not induced by O6 colonization alone. Before challenge inoculation, no increase in the gene transcriptions could be detected in previously O6-treated and untreated plants but, upon subsequent inoculation with the pathogenic fungus, transcription levels in O6-treated plants rose significantly faster and stronger than in untreated plants. Therefore, the O6-mediated ISR may be associated with an enhanced capacity for the rapid and effective activation of cellular defense responses which becomes apparent only after challenge inoculation on the distal, untreated plant parts, as suggested by Conrath et al. (2002). This work was supported by a grant R11-2001-092-02006-0 from the Korea Science and Engineering Foundation through the Agricultural Plant Stress Research Center at Chonnam National University.

• Journal of Microbiology and Biotechnology
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• 제11권6호
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• pp.1046-1054
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• 2001

Bioleaching is the process in which insoluble metal sulfide is oxidized by specialized iron- and/or sulfur-oxidizing lithotrophic bacteria in acidic, metal-rich environments. Most of these processes are carried out by the genus Thiobacillus. Three novel Thiobacillus strains (Thiobacillus thiooxidans AZ11, Thiobacillus thiooxidans MET, and thiobacillus thiooxidans TAS) associated with bioleaching have been isolated from soil and sludge (Korean patent No. 1999-0073060 for T. thiooxidans AZ11, Korean patent No. 1999-0005798 for T. thiooxidans MET, and Korean patent No. 1999-0073059 for T. thiooxidans TAS). A partial sequence of 16S ribosomal RNA gene (16S rDNA) and the entire sequence of 16S/23S intergenic spacer region (ISR) were determined in the three above novel strains and in Thiobacillus ferrooxidans ATCC19859 as a reference strain. When phylogenetic analysis was performed based on G+C contents and sequence alignments, T. ferroxidans ATCC19859 was found to be closely related to previously registered T. ferrooxidans strains in a monophyletic manner, while the three novel T. thiooxidans strains were classified in a paraphyletic manner. Close examination on the base composition of 16S/23S ISR revealed that the 5\` part (nucleotide residues 21-200) was specific for the genus Thiobacillus. On the other end, the 3\` part (nucleotide residues 201-520) showed specificity in T. ferrooxidans strains, but not in T. thiooxidans strains. These results suggest that the proximal and distal halves of 16S/23S could be used as a genetic marker for the identification of the genus Thiobacillus and the species T. ferrooxidans, respectively.

• 한국콘텐츠학회논문지
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• 제8권5호
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• pp.246-259
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• 2008

본 연구에서는 육군 지상전술 C4I체계(ATCIS)가 전방 군단별로 구축 초기단계에 있어, 체계의 불안정과 운영의 비효율 등 문제점이 도출됨에 따라 시행착오를 최소화하고 경제성과 효과성을 검증하기 위해 문헌적 연구와 더불어 각국의 체계와 특성을 살펴보았으며, 실제 현장에서 자료수집과 더불어 공통성, 적시성, 경량화 및 단순화, 자동성, 야전 및 생존성, 다단계 보안 및 상호 운용성, 통합성과 국방 표준화 등 운용자 요구수준을 설문 자료를 수집하여 실증적인 분석과 검증을 통해 상호 상관관계를 살펴보았다. 검증결과 체계의 규격 및 운용예규, 기동성 및 보안성, 전장환경 적응성, 체계 지원 및 관리가 잘되어야만 체계운용에 대한 신뢰도가 확보됨과 동시, 체계에 대한 운용요구가 높고, 또한 체계운용 관련하여 지속적인 교육훈련과 체계정비 및 보완소요가 적어야 C4I체계가 잘 운용된다는 것을 알 수 있었다. 따라서 발전 방안은 체계에 대한 지속적인 운용자 교육과 정비시스템의 구축, IT와 네트워크를 결합한 한국적인 특성을 살린 한 단계 발전된 디지털화(C4ISR+D)화와 더불어 향후 운용자 측면의 성과측정 모델의 시스템 개발을 통해 지속적으로 보완 발전시켜야 한다는 사실을 확인할 수 있었다.

• 한국전자파학회논문지
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• 제22권3호
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• pp.380-388
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• 2011

본 논문에서는 소형 하이브리드 HMIC(Hybrid Microwave Integrated Circuits)를 사용하여 레이더용 X-대역 63 watt 펄스 구동형(pulsed) SSPA(Solid State Power Amplifier)를 개발하였다. Pulsed SSPA는 전원공급기와 초단증폭기, 구동증폭기, 고출력을 위한 최종단 증폭기의 3단의 증폭기로 구성되어 있다. 70도의 고온에서도 듀티 1.2%이고, 짧은 펄스 폭에서 63 watts 이상의 출력을 얻었다. 제작된 모듈은 동작대역 내에서 포화 상태의 이득 37 dB 성능을 보였다. 입출력 정재파비는 1.5:1 미만을 만족하였다. 이 모듈은 +28 $V_{dc}$로 동작되고 400 mA 전력 소모를 가진다. 본 논문에서 개발한 SSPA는 고속으로 동작하는 펄스 도플러 레이더에 적용할 수 있다.

• Journal of the Optical Society of Korea
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• 제13권2호
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• pp.240-244
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• 2009

An Er-doped superfluorescent fiber source is designed and constructed with the double-pass forward configuration, which aims at high stability of its mean wavelength against temperature variation. As a result, thermal stability of mean wavelength better than 1 ppm is obtained against the temperature variation of ${\pm}5^{\circ}C$ around the optimum operating temperature. The optimum operating temperature can be tuned with the Er-doped fiber length and the pump power.

• 한국전자파학회논문지
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• 제29권1호
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• pp.36-41
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• 2018

본 논문에서는 밀리미터파(W 대역) 다중개구각 혼안테나를 제안하였다. 제안된 안테나는 전계면 및 자계면 빔폭이 동일한 다중모드 이중편파 정사각형 혼으로서 다중모드 생성부, 4개의 정사각형 도파관 여기부, 합패턴 형성을 위한 직교모드 변환기와 전력결합기로 구성된다. 제작이 용이하도록 안테나 구조를 설계하고, 층별 기계가공과 확산접합 기법을 적용하여 ${\pm}0.02mm$ 오차 이내로 제작하였다. 회로망분석기와 원전계 측정시설을 이용하여 제작된 안테나의 입력 반사계수와 방사패턴을 측정하였다. 측정 결과, 제안한 안테나는 중심 주파수를 기준으로 1 GHz 이내에서 17.7~18.3 dBi의 이득, $25.2{\sim}28.5^{\circ}$의 빔폭, 1.02~1.75의 입력 VSWR 특성을 가짐을 확인하였다.