• Journal of Biosystems Engineering
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• v.24 no.6
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• pp.523-530
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• 1999

자기공명영상 (MRI)기법은 최근에 그의 이용 분야가 식품공학 및 농학 분야까지 확대되고 있다. 이 연구에서는 MRI의 기본 원리를 알아보고 어떤 요인들이 자기공명영상의 명암을 결정하는지 알아 보았다. MRI를 이용하여 비파괴적인 방법으로 농축산물의 내부 구조 영상을 얻고 이로부터 토마토의 내부 공동, 감자의 공동병, 사과와 파파야의 멍, 버찌씨의 유무, 망고와 감자의 벌레에 의한 손상, 망고와 마늘의 내부 결함, 키위의 성숙도에 따른 변화, 그리고 소고기의 내부 구조 둥을 판별할 수 있음을 알아 보았으며 농축산물의 품질을 결정짓는 이러한 내부 요인들이 어떻게 자기공명영상을 형성하는지 알아 보았다. 대상 시료에 따라 적당한 자기공명영상 인자(TR과 TE)를 선택하여야 한다. 또한 특정 인자를 강조하기 위해서는 최적의 자기공명영상 인자를 선택하여야 한다.

• Proceedings of the Korean Society for Agricultural Machinery Conference
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• 2002.07a
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• pp.394-399
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• 2002

국민소득의 증대와 함께 소비자의 고품질 농축산물에 대한 수요와 관심이 날로 증가하고 있다 이에 따라 안전하며 고품질인 농축산물을 소비자에게 공급하기 위하여 안전한 농축산물의 생산, 신선도 유지를 위한 유통구조의 개혁, 품질 및 안전성 평가기술개발을 위한 노력이 보다 더 요구되고 있다. 소비자가 믿고 구매하기 위해서는 농축산물에 대한 품질보증이 필수적이며 이를 위해서는 신속하고 정확한 품질 및 유해물질의 판정기술 개발이 필요하다. 많은 농축산물에 있어서 주요 품질인자인 숙도 및 신선도의 변화는 휘발성 화학물질로 이루어진 냄새의 변화로 나타나므로 이를 측정하여 품질 및 안전성을 간접적으로 판정할 수 있다 기존의 냄새에 의한 품질 판정은 판별전문가에 의한 관능평가법 또는 GC(Gas Chromatography)나 GC/MS(Gas chromatograph mass spectrometer)에 의하여 주로 이루어져 왔다. 하지만, 관능평가법의 경우 판별전문가의 개인적인 차이, 피로, 건강상태 등에 따라 판정의 객관성이 떨어질 우려가 있고, GC나 GC/MS를 이용할 경우 냄새분석에 많은 시간과 노력이 소요되는 문제점이 있다. (중략)

• Journal of Navigation and Port Research
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• v.33 no.10
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• pp.671-678
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• 2009

Recently, there have been some researches in the equipment fault detection based on shock and vibration information. Most research of them is based on shock and vibration monitoring to determine the equipment fault or not. Different with engine fault detection based on shock and vibration information we focus on detection of engine for boat and system control. First, it use the duplicated-checking method for shock and vibration information to determine the engine fault or not. If there is a fault happened, we use the integral to determine the error engine shock wave width and detect the fault area. On the other hand, we use the engine trend analysis and standard of safety engine to implement the shock and vibration information database. Our simulation results show that the probability of engine fault determination is 98% and the probability of engine fault detection is 72%

• Korean Journal of Construction Engineering and Management
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• v.5 no.3 s.19
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• pp.97-105
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• 2004

Planning phase became very important because the construction market in Korea is often unpredictable. The existing feasibility analysis cannot fulfill its purpose in development projects because they are based on intuitive approach rather than systematic approach. The purpose of this study is to make a prototype of feasibility model to be a good investment. To build the model, first, risk factors which can be occurred in project had to be selected. Risk factors were divided into several groups in basis of characteristical risk. Economical risk factors were input on financial analysis. Then, to catch the relevance and influence of all risk factors, influence diagram and decision tree were made. Finally, sensitivity analysis was activated, then what the critical factors were, and how those factors could be solved. Through these procedures, the feasibility model that was made in this study could include both quantitative and qualitative factors. This model is expected to be used as a guide of feasibility analysis including all risk factors and is to serve systematic frame in planning and feasibility stage.

• Research in Plant Disease
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• v.19 no.4
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• pp.243-253
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• 2013

Rice blast is one of the most serious disease threatening stable production of rice. Breeding of resistant cultivars has been used as the most effective and useful method to controll rice blast caused by Magnaporthe oryzae. To collect rice blast isolates in fields and test their pathogenicity on new cultivars are important for establishment of new resistant cultivars breeding program of rice. Pathotypes of Korean rice blast isolates have been categorized to Korean differential race system developed in 1985. However, it is little known about genetic background of Korean differential cultivars, so that it is hard to understand for relationship between each pathogen and each host plant at genetic level. In this study, we suggested necessity of a new differential system by analyzing pathogenic responses between 24 monogenic rice lines and 200 Korean rice blast isolates. In addition, we determined the nine representative resistant genes based on the resistance responses of the monogenic lines to rice blast isolates, indexed resistant responses of the monogenic lines to ten representative rice blast isolates and selected 30 Korean representative rice blast isolates proper to Korean system. We think the newly developed differential race system can be broadly used to select resistant cultivars to rice blast in Korea.

• Journal of Korean Society of Forest Science
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• v.97 no.6
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• pp.565-569
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• 2008

Geographic variation of characteristics of cone, seed and bract morphology were examined in 8 populations of rare endemic Abies nephrolepis (Trautv.) Maxim and A. koreana Wilson. Additionally we studied classification index to distinguish between the species by the method of discriminant analysis. Nested ANOVA showed that there were statistically significant differences among populations as well as among individuals within populations in all 13 morphological traits. In the seed length, seed index, bract width, and bract index of A. nephrolepis and the bract width and index of A. koreana, variance components among populations were larger than those among individuals within populations. In discriminant analysis, three traits (cone width, length of seed wing, and bract length) were found to be useful in discriminating A. nephrolepis from A. koreana. The optimal classification results of stepwise selection were discriminated length of seed wing and bract length.

• Journal of Animal Science and Technology
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• v.49 no.1
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• pp.1-8
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• 2007

This study was focused on discriminating the molecular sexes of red deer and elk by duplex polymerase chain reaction(PCR) using two primer sets. Sex differentiation of mammals is primarily dependent on the presence or absence of sex determining region Y(SRY) gene encoded on Y chromosome which plays a key role for male development. Zinc finger X-Y(ZFX-ZFY) gene, one of X-Y homology gene group was found on X- and Y- chromosomes, respectively. At first, the nucleotide sequences were characterized for the intron 9 flanking region of ZFX-ZFY genes. The intron 9 of ZFX and ZFY is 529-bp and 665-bp in length, respectively. A transposable element sequence similar to bovine SINE element Bov-tA was detected only in ZFY gene of Cervidae. Sexing analysis was conducted by duplex PCR assay for amplification of SRY and ZFX-ZFY genes. Two differentially amplified patterns were found: one for females has a common band amplified only from ZFX as a template, and another for males had three bands(a common ZFX and two male-specific ZFY and SRY). On the separate tests using each gene, the results was identical to those from duplex PCR assay. Moreover, the results from PCR assays provide also identical information to phenotypic investigation of individuals of red deer, elk as well as their hybridized progenies collected from two isolated farms. These results suggest that it may be a rapid and precise method for determining the sexes by duplex PCR amplification using Y-chromosome specific SRY and X- and Y- homologous ZFX-ZFY genes showing sexual dimorphism in red deer and elk without any other controls.

• Proceedings of the KIEE Conference
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• 2002.07b
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• pp.1286-1288
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• 2002

본 연구에서는 차세대 교통체계인 첨단교통 시스템(ITS)에서 차량 운전자 및 도로이용자에게 도로 및 교통정보를 제공하기 위하여 설치 및 운영되고 있는 도로전광표지(Variable Message Sign : VMS)의 시인성을 분석하기 위하여, 가장 중요한 기초 변수인 휘도와 색도를 측정하였다. 측정치를 통하여 VMS의 휘도와 색도가 시인성을 판별할 수 있는 성능 인자로써 가능한지를 검토하고, 향후 VMS 시스템의 설치 및 관리 기술에 실무요령의 활용 여부를 검토한다.

• Transactions of the Korean Society of Mechanical Engineers
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• v.8 no.3
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• pp.257-263
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• 1984

저항 점 용접시 발생하는 어려운 문제점의 하나는 아무리 동일한 용접조건 하에서 용접을 한다하 더라도 균일한 용접품질을 얻을 수 없다는 점이다. 이는 주로 용접중의 전원에서의 변화로 인한 용접전류 및 전압변동, 용접모재의 표면상태 및 두께의 불균일, 두 전극의 마멸 및 맞춤상태 등의 인자 때문에 기인한다고 볼 수 있다. 이러한 문제점을 해결하기 위해서는 용접하는 도중에 수시 로 인자 때문에 기인한다고 볼 수 있다. 이러한 문제점을 해결하기 위해서는 용접하는 도중에 수 시로 용접 상태를 점검하여 용접조건을 그때 그때에 적합하게 변화시켜 주는 것이 바람직한데 우 선 용접상태를 판별하기 위해서는 용접품질(weld quality)을 잘 대변할 수 있는 용접법 변수를 찾 아내는 것이 중요한 일이다. 따라서 본 논문에서는 용접품질에 관련되는 변수중, 전기동저항과 전 극분리현상을 측정해서 마이크로 컴퓨터를 사용하여 관련되는 특정값들을 구했고 이들과 인장실 험에서 얻은 용접강도와의 상관관계를 얻음으로써 과연 어떠한 공정변수가 용접품질을 잘 대변해 줄 수 있는가를 실험적으로 조사하였다.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.4
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• pp.621-625
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• 2018

This paper proposes a method for bridge damage factor recognition from inspection reports using deep learning. Bridge inspection reports contains inspection results including identified damages and causal analysis results. However, collecting such information from inspection reports manually is limited due to their considerable amount. Therefore, this paper proposes a model for recognizing bridge damage factor from inspection reports applying Named Entity Recognition (NER) using deep learning. Named Entity Recognition, Word Embedding, Recurrent Neural Network, one of deep learning methods, were applied to construct the proposed model. Experimental results showed that the proposed model has abilities to 1) recognize damage and damage factor included in a training data, 2) distinguish a specific word as a damage or a damage factor, depending on its context, and 3) recognize new damage words not included in a training data.