• 한국동물학회지
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• 제25권2호
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• pp.93-106
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• 1982

노랑 초파리 3령 유충의 날개성체원기와 같은 세포군의 분화와 단백질 합성이 관계가 있는지 살펴 보았다. 3령기에 흔적시의 성체원기는 비록 정상종의 성체원기의 크기와 형태가 매우 유사하지만 정상적인 날개로 분화하지 못한다. 이러한 노랑초파리 (Drosophila melanogaster)의 정상종과 날개돌연변이종인 흔적시 유충 3령기의 성체원기에 축적되었거나 합성되는 단백질을 전기영동법으로 분석하여 비교하여 보았다. 누적된 단백질의 양상은 두 종 간에 다소 차이를 보이기는 했으나, 질적이기 보다는 오히려 양적인 차이로 생각되었다. 합성된 단백질 양상을 3령의 여러 단계에서 분석해 본 결과, 비록 소수의 단백질이 정상종, 혹은 흔적시 특유의 단백질로 나타났지만, 전반적으로 그 양상이 매우 유사하였다.

• 한국잠사곤충학회지
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• 제35권2호
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• pp.93-99
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• 1993

새로운 돌연변이 불면잠 nmn에 대한 조직학적 관찰 및 생리 생화학적 분석 결과를 요약하면 다음과 같다. 부화 3일째가 되면 정상잠은 흉부가 흰색을 복부는 갈색을 나타내는데 비해 불면잠은 전체적으로 암갈색을 띠며 부화 7,8일경이 되면 대부분 치사한다. 잠기별 발현비율은 월년란에 비해 인공부화란에서 현저하게 높았으며 부화날짜별 불면잠의 발현비율은 3일동안 거의 비슷했다. 조직학적 관찰결과 불면잠의 탈피선은 정상잠의 그것에 비해 형태나 크기에 있어서 큰 차이를 나타냈으며 정상잠이 면중에 새로운 피부가 형성되는데에 비해 불면잠에서는 신피형성이 인정되지 않았다. 유충혈액중의 총단백질은 정상잠이 불면잠에 비해 훨씬 많았을 뿐만 아니라 질적으로도 수종의 단백직 성분에서 차이가 있는 것으로 나타났다.

• 한국전자통신학회논문지
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• 제9권5호
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• pp.595-600
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• 2014

요즘 우리 사회는 급속히 고령화 사회로 변화되고 있다. 고령화 사회에서는 치매에 대하여 잘 아는 것이 매우 중요한 일이다. 따라서 본 연구는 기본적으로 치매환자로부터 측정한 EEG 신호의 특성을 파악하는 것을 목표로 한다. 먼저 그것을 위하여 치매환자와 정상인의 EEG 특성을 구분하기 위하여 두 그룹의 자발 EEG 신호를 분석하였다. EEG 신호는 16개의 전극으로 계측하였고, 그 신호들은 주파수대역으로 분류하여 분석하였다. 보다 선명한 EEG 신호로 처리하기 위해서는 2개의 채널 간에 상호상관함수를 적용하였다. 그 결과, 치매환자와 정상인의 EEG 신호의 특성은 분명히 다르다는 사실을 확인할 수 있었다.

• Geomechanics and Engineering
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• 제35권5호
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• pp.475-486
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• 2023

Ballast particles have an irregular shape and are discrete in nature. Due to the discrete nature of ballast, it exhibits complex mechanical behaviour under loading conditions. The discrete element method (DEM) can model the behaviour of discrete particles under a multitude of loading conditions. DEM is used in this paper to simulate a series of three-dimensional direct shear tests in order to investigate the shear behaviour of railway ballast and its interaction at the microscopic level. Particle flow code in three dimension (PFC3D) models the irregular shape of ballast particles as clump particles. To investigate the influence of particle size distribution (PSD), real PSD of Indian railway ballast specification IRS:GE:1:2004, China high-speed rail (HSR) and French rail specifications are generated. PFC3D built-in linear contact model is used to simulate the interaction of ballast particles under various normal stresses, shearing rate and shear box sizes. The results indicate how shear resistance and volumetric changes in ballast assembly are affected by normal stress, shearing rate, PSD and shear box size. In addition to macroscopic behaviour, DEM represents the microscopic behaviour of ballast particles in the form of particle displacement at different stages of the shearing process.

• 전자공학회논문지A
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• 제33A권2호
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• pp.87-95
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• 1996

We have studied the effects of La concentration on the optical and electrical properties of lead lanthanum titanate (PLT) thin films by using sol-gel method. Both the optical and electrical properties are greatly affected by the La concentration. The refreactiv eindices of the films varied from 2.23 to 1.93 with varying La concentration in the range from 15 to 33 mol%. The dielectric constants of the films vary form 340 to 870 with varying La concentration in the range form 15 to 33 mol%. Hysteresis loop becomes slimmer with the increase of La concentration form 15 to 28mol% and little fatter again with the increase of La concentration form 28 to 33 mol%. Among the films investigated in this research, PLT(28) thin film shows the best dielectric properties for the application to the dielectrics of ULSI DRAM's. At the frequency of 100Hz, the dielectric constant and the loss tangent of PLT(28) thin films are 940 and 0.08 respectively. Its leakage current density at 1.5${\times}10^{5}$V/cm is 1${\times}10^{-6}A/cm^{2}$. The comparision between the simulated and the experimental curves for the switching transient characteristics shows that PLT (28) thin films behaves like normal dielectrics.

• 한국식품영양학회지
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• 제20권4호
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• pp.384-391
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• 2007

The purpose of this study was to investigate the preference determinants of buddhist temple food(BTF) and leaded to its activation based on these results. 354 subjects were participated in the survey using questionnaires. 66.9% of subjects had over the normal interest. The taste of BTF was light(34.7%) and it would be helpful in their health(72.9%), subjects answered. Lightness and not strong taste was the main reason of preferring BTF(50.8%), but lack of nutrients was dislike reason of BTF generally. According to factor analysis, the factors of preference determinants deduced as the external form, social environment, health, essential quality and information of food. There were not significantly different between factors by sex and family form. External form, health and essential quality of food had the significant difference by generation and education level. The factors of external form and the essential quality of food showed the significant difference by job. According to the monthly income, the factor of social environment, health and information of food had the significant difference.

• 한국CDE학회논문집
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• 제17권3호
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• pp.175-187
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• 2012

The BIM simulation systems involve inefficient aspects in delivering real world circumstances because they are operated in the virtual reality (VR) environment without representing the job-site operations. Differently from VR, augmented reality (AR) enhances the reflection of job-site reality to virtual environment. AR influences architecture, design and construction. This reality replaces or merges with the normal physical world and it can be tailored to enhance comprehension for specific design and construction activities. The main objective of this research is to develop an AR-based decision support system for free-form buildings design/construction/maintenance processes. Haewoojae, a free-form housing building built in Seoul area is identified as a model building to generate the system. Seventeen engineers, who are masters or doctorate graduate students at the S university in Seoul and have been working in the Korean construction industry for more than 10 years are invited to validate the system's appropriateness and usability in comparison with its development objectives.

• 한국임상수의학회지
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• 제24권3호
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• pp.467-472
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• 2007

Alimentary lymphoma accounts for approximately 5% of neoplasm and diffuse lesion is more common than solitary nodular form in dogs. An eleven year-old male Yorkshire terrier was examined because of nonspecific gastrointestinal symptoms such as anorexia and vomiting for 10 days. An abdominal mass was palpated, which was originated from small intestinal wall in abdominal ultrasonography. Small intestine was obstructed by hypoechoic mass and lost normal layering and measured 24.5m. After fine-needle aspiration, septic peritonitis due to intestinal rupture occurred and emergency surgery was performed. Solitary mass was found in small intestine and diagnosed as alimentary lymphoma through histopathologic examination. Conclusively, abdominal ultrasonouaphy could verify the thickened bowel, loss of wall layering and decrease of motility and percutaneous ultrasound-guided fine-needle aspiration is considered as useful diagnostic technique, especially in nodular form of alimentary lymphoma.

• 한국가시화정보학회지
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• 제20권2호
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• pp.78-85
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• 2022

In these days, the rapid development in prediction technology using artificial intelligent is being applied in a variety of engineering fields. Especially, dimensionality reduction technologies such as autoencoder and convolutional neural network have enabled the classification and regression of high-dimensional data. In particular, pixel level prediction technology enables semantic segmentation (fine-grained classification), or physical value prediction for each pixel such as depth or surface normal estimation. In this study, the pressure distribution of the ship's surface was estimated at the pixel level based on the artificial neural network. First, a potential flow analysis was performed on the hull form data generated by transforming the baseline hull form data to construct 429 datasets for learning. Thereafter, a neural network with a U-shape structure was configured to learn the pressure value at the node position of the pretreated hull form. As a result, for the hull form included in training set, it was confirmed that the neural network can make a good prediction for pressure distribution. But in case of container ship, which is not included and have different characteristics, the network couldn't give a reasonable result.

• 한국정밀공학회지
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• 제11권2호
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• pp.50-64
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• 1994

Cutter deflections in the ball-end milling process is one of the main causes of the machining errors on a free-form surface. In order to avoid machining errors in this process, a methodology avoiding these machining errors on the free-form surfaces has been developed. In this method, feedrates in the finish cuts are adjusted for the prevention of machining errors. A model for the prediction of machining errors on the free-form surface is analytically derived as a function of feed and normal vector at the surface of contact point by the cutter. This model is applied to the dertermination of the adjusted feedrates which satisfy the machining tolerance of the surface. In the finish cuts of a simple curved surface, the suggested model is examined by the measurements of the generated machining error on this surface. And also, this surface is machined with the adjusted feedrates for the given machining tolerance. The measured machining errors on this surface are compared with the given tolerance. In this comparisons, it is shown that the predicted errors are fairly good agreement with the test results.