• 제목/요약/키워드: Abnormal Pattern Analysis

검색결과 163건 처리시간 0.03초

중성자속잡음 신호를 이용한 원자로의 전동감시 (Vibration Monitoring of Reactor Internals Using Excore Neutron Flux Noise Signals)

  • 김성호;강현국;성풍현;한상준;전종선
    • 소음진동
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    • 제5권3호
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    • pp.361-371
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    • 1995
  • The vibration of reactor internals should be monitored and diagnosed for the early detection of the failure of reactor pressure vessel. This can be performed by analyzing the time-history signals from the excore neutron flux detertors. The conventional method is an on-demand system which generates power spectra through Fast Fourier Transform(FFT) algorithm. The operator can make his own decision to detect abnormal vibration using these spectra. This post- processing method, however, requires special expertise in the reactor noise analysis and signal processing for random data. It may mislead the operator into erroneous decision-making, if he is a novice in reactor noise analysis. Hence this study is focused on the automated monitoring and diagnosis procedure for the reactor noise analysis, especially on the Fuzzy algorithm to recognize the pattern of the vibration of Core Suport Barrel. The excore neutron signals of Yonggwang Nuclear Power Plant unit 3 is acquired and analyzed using conventional FFT spectra and tested to adopt the Fuzzy method. An Automated Monitoring and Diagnosis System for CSB Vibration using this Fuzzy method is proposed. Furthermore, vibration data for CSB of Youggwang Nnclear Power Plant unit 3 is presented.

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CNG압력용기의 열처리 조건별 파열 특성에 관한 실증적 연구 (An Empirical Study on the Bursting Properties According to Heat Treatment Condition of the CNG Pressure Vessel)

  • 김의수
    • 한국안전학회지
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    • 제32권5호
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    • pp.1-7
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    • 2017
  • Forensic Engineering is the art and science of professionals qualified to serve as engineering experts in courts of law or in arbitration proceedings. Buses using compressed natural gas (CNG) trend to be extended in use internationally as optimal counterplan for reducing discharge gas of light oil due to high concern about environment. However, CNG buses is equipped with composite pressure vessels (CPVs); since the CPVs contain compressed natural gas, the risks in the case of accident is very high. In this study, the bursting test for the pressure vessel depending on the heat treatment conditions of the vessel in which the actual ruptured accident occurred, after the bursting test, the fracture pattern analysis had performed. The mechanical materials properties test using Instrumented Indentation Test had performed to confirm the mechanical properties for each heat treatment cases. Also, the fractography analysis and metallographic analysis had performed to find out the difference of each heat treatment case. By comparing normal vessel with abnormal vessel which have defect of heat treatment conditions in term of the bursting patterns and characteristics of containers using various forensic engineering methods, especially, it is possible to understand how important the heat treatment process is in the high pressure vessel unlike any product.

금형 기반 진동 신호 패턴의 유사도 분석을 통한 사출성형공정 변화 감지에 대한 연구 (A Study on Detecting Changes in Injection Molding Process through Similarity Analysis of Mold Vibration Signal Patterns)

  • 김종선
    • Design & Manufacturing
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    • 제17권3호
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    • pp.34-40
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    • 2023
  • In this study, real-time collection of mold vibration signals during injection molding processes was achieved through IoT devices installed on the mold surface. To analyze changes in the collected vibration signals, injection molding was performed under six different process conditions. Analysis of the mold vibration signals according to process conditions revealed distinct trends and patterns. Based on this result, cosine similarity was applied to compare pattern changes in the mold vibration signals. The similarity in time and acceleration vector space between the collected data was analyzed. The results showed that under identical conditions for all six process settings, the cosine similarity remained around 0.92±0.07. However, when different process conditions were applied, the cosine similarity decreased to the range of 0.47±0.07. Based on these results, a cosine similarity threshold of 0.60~0.70 was established. When applied to the analysis of mold vibration signals, it was possible to determine whether the molding process was stable or whether variations had occurred due to changes in process conditions. This establishes the potential use of cosine similarity based on mold vibration signals in future applications for real-time monitoring of molding process changes and anomaly detection.

불임환자의 고 Prolactin 혈증에 관한 연구 (Clinical Analysis and Investigation for the Infertile Women with Hyperprolactinemia)

  • 강순범;강병문;김정구;이진용;장윤석
    • Clinical and Experimental Reproductive Medicine
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    • 제13권1호
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    • pp.21-28
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    • 1986
  • It is now apparent that many cases of amenorrhea. oligomenorrhea. corpus luteum deficiency, galactorrhea, and infertility are due to hyperprolactinemia. We investigated the relationships between serum prolactin values and factors such as menstrual pattern, frequency of galactorrhea etc, in 135 hyperproIactinemic patients at the Seoul National University Hospital during a period of 6 years, from January, 1979 to December, 1984. The results was as follows: 1. Menstrual pattern changed according to the serum prolactin level. The frequency of amenorrhea is 1.7 percent in patients with serum prolactin levels ranged from $25{\sim}40ng/ml$, whereas 72.4 percent in patients with serum prolactin levels above 100ng/ml. 2. The incidence of galactorrhea in hyperprolactinemic patients was 3.1 percent and the frequency of galactorrhea had direct relationship with the serum prolactin level and/or the frequency of abnormal menstrual pattern. 3. The incidence of pituitary tumor in hyperprolactinemic patients was 104 percent and sixty percent of patients with serum prolactin levels above 100ng/ml had a pituitary tumor . 4. There was an inverse correlation between serum prolactin and progesletone value. 5. The frequency of anovulatory menstrual cycle evidenced by basal body temperature is 23.9 percent in patients with serum prolactin levels ranged from $20{\sim}40ng/ml$, whereas 76.9 percent in patients with serum prolactin levels above 100ng/ml.

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잠복성 간질에 대한 항간제 투여의 뇌파상 효과 (Antiepileptic Therapy for Latent Epilepsy)

  • 박충서;변영주;하정상
    • Journal of Yeungnam Medical Science
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    • 제2권1호
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    • pp.71-75
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    • 1985
  • 1985년 1월부터 10월까지 본 영남대학교 의과대학 부속병원 신경과 외래를 찾은 두통환자 중에서 뇌파상 중등도 이상의 이상이 있는 환자가 580명이었다. 이들 중에서 간질의 간헐기 뇌파와 유사한 소견을 보이는 162명 환자들을 대상으로 투여한 항간제 및 뇌영양제 등을 단독 혹은 병용 투여한 한 후 치료효과를 분석한 결과 항간제투여군 29예에서 호전이 16예, 무변화가 13예이고, 항간제를 쓰지 않고 뇌 영양제를 사용했던 18예에서는 전예에서 호전을 보았다. 한편 항간제를 사용한 33예와 사용하지 않은 35예에서는 뇌파추적을 하지 못하였다. 수가 적어서 통계학적인 고찰은 하지 않았으며 앞으로 계획석인 계속 연구가 요망된다.

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에너지 절감형 서버 클러스터 환경에서 QoS 향상을 위한 소비 전력 예측 (Prediction of Power Consumption for Improving QoS in an Energy Saving Server Cluster Environment)

  • 조성철;강산하;문흥식;곽후근;정규식
    • 정보처리학회논문지:컴퓨터 및 통신 시스템
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    • 제4권2호
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    • pp.47-56
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    • 2015
  • 에너지 절감형 서버 클러스터 환경에서는 서버 전원 모드가 부하상황에 따라 제어된다. 다시 말하면 현재 부하를 처리하는 데 필요한 대수의 서버들만 ON하고 나머지 서버들은 OFF한다. 이 알고리즘은 정상적인 상황에서는 잘 동작하지만 부하가 급증 또는 급감하는 비정상적인 상황에서는 QoS를 보장할 수 없다. 왜냐하면 서버가 OFF에서 ON으로 바뀌는 데 필요한 지연시간 때문에 ON 서버 대수를 당장 증가시킬 수 없기 때문이다. 본 논문에서는 정상적인 상황뿐만 아니라 비정상적인 상황에서도 QoS를 향상시키는 새로운 소비 전력 예측 알고리즘을 제안한다. 제안된 예측 알고리즘은 기존 시계열 분석에 기반한 예측과 추세를 반영한 예측 조정의 두 부분으로 구성된다. 15대의 서버 클러스터를 이용하여 실험이 수행되었고, 4가지 유형의 기존의 시계열 예측 모델과 본 논문에서 제안하는 4가지 유형의 수정된 모델에 대해 성능을 비교하였다. 실험 결과 4가지 유형 중 추세조정 지수평활법(ESTA)과 본 논문에서 제안된 ESTA(MESTA)가 표준화된 QoS 및 단위전력당 좋은 응답수 측면에서 가장 우수한 성능을 보였으며, 또한 본 논문에서 제안한 MESTA 알고리즘이 기존의 ESTA 알고리즘에 비해 가상 부하패턴과 실제 부하패턴에 대해 QoS가 7.5%, 3.3% 각각 향상됨을 보여주었다.

사물인터넷 환경에서 제품 불량 예측을 위한 기계 학습 모델에 관한 연구 (A Study on the Machine Learning Model for Product Faulty Prediction in Internet of Things Environment)

  • 구진희
    • 융합정보논문지
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    • 제7권1호
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    • pp.55-60
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    • 2017
  • 사물인터넷 환경에서 인간의 개입 없는 지능화된 서비스를 위해서는 IoT 디바이스에서 생성되는 빅데이터로 부터 정상 패턴을 학습하고 이를 기반으로 불량, 오작동과 같은 이상 징후에 대해 예측하는 과정이 요구된다. 본 연구의 목적은 제품 공정의 다양한 기기에서 발생되는 빅데이터를 분석함으로써 제품 불량을 예측할 수 있는 기계 학습모델을 구현하는 것이다. 기계 학습 모델은 어느 정도 볼륨을 가진 기존 데이터를 기반으로 분석을 해야 하므로 빅데이터 분석도구 R을 사용하였으며, 제품 공정에서 수집된 데이터에는 제품에 대한 불량 여부가 포함되어 있으므로 지도 학습 모델을 활용하였다. 연구의 결과, 제품 불량에 영향을 주는 변수 및 변수 조건을 분류하였고, 의사결정 트리를 기반으로 제품의 불량 여부에 대한 예측 모델을 제시하였다. 또한, ROC Curve를 이용한 모델의 적합성 및 성능평가 분석에서 모델의 예측력은 상당히 높게 나타났다.

Analysis of Differentially Expressed Genes in Cloned Bovine Placenta

  • Park, Hee-Ja;Ko, Yeoung-Gyu;Hwang, Seong-Soo;Yang, Byoung-Chul;Seong, Hwan-Hoo;Oh, Seok-Doo;Hwang, Sue-Yun;Min, Kwan-Sik;Yoon, Jong-Taek
    • Reproductive and Developmental Biology
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    • 제33권1호
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    • pp.41-48
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    • 2009
  • Placenta is the main nutrition source for the fetus during pregnancy. Thus, it has a pivotal function in the pregnant process. Many functions of the placenta have been elucidated. An abnormal placenta is associated with a high rate of pregnancy failure in somatic cloned bovine. Differentially expressed genes (DEGs) were examined in a comparison between normal and cloned bovine placenta using annealing control primer (ACP)-based GeneFishing PCR. Using 120 ACPs, nearly 80 genes were identified and the fragments of 42 DEGs were sequenced. 38 of these genes were known genes and four were unknown. To determine the DEGs result, six target clones expressing on one-side of a normal and a clone placenta were selected. Through an analysis of the target genes using the real-time PCR, the expressing pattern was found to be somewhat different from the DEGs. Additionally, several genes appeared with the same expression pattern. Taken together, this suggests that the target genes would be essential for research into what influences the placental formative mechanisms during fetal development.

A STUDY ON THE EXPRESSION OF TYPE I AND TYPE II COLLAGEN GENES AND PROTEINS IN THE DEVELOPING HUMAN MANDIBLE

  • Kook, Yoon-Ah;Kim, Sang-Cheol;Kim, Eun-Cheol
    • 대한치과교정학회지
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    • 제25권6호
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    • pp.723-731
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    • 1995
  • Type I and type II collagens are considered the major collagens of bone and cartilage respectively. Monitoring the patterns of those gene and protein expressions during development will provide a basis for the understanding of the normal and abnormal growths. This study was undertaken to investigate the expression of collagen genes and proteins involved in the developing human mandible. Fifty embryos and fetuses were studied with Alcian blue-PAS, Masson's Trichrome, reverse transcription polymerase chain reaction (RT-PCR), Western blot analysis, and Southern blot analysis. Our results showed that $pro-{\alpha}1(II)$ collagen gene expression begins in the 5th week. Type II collagen is synthesized in mesenchymal cells in advance: of overt chondrogenesis. The gene expression for type II collagen was highest during the appearance of Meckel's cartilage. There was a switch in collagen protein expression from type I to type II during the appearance stage of Meckel's cartilage. The distribution of the mRNA for type II collagen corresponded well with the pattern of type II collagen protein. The endochondral ossification was observed where there was direct replacement of cartilage by bone.

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Expression of Poly (ADP-ribose) Polymerase During Apoptosis Induced by Ultraviolet Radiation in HeLa $S_3$ Cells

  • Chang, Jeong-Hyun;Kwon, Heun-Young
    • 대한의생명과학회지
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    • 제12권4호
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    • pp.349-354
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    • 2006
  • Induction of apoptosis allows the organism to get rid of abnormal cells and also of tumor cells. Understanding the mechanism involved in Ultraviolet radiation (UV) induced apoptosis may improve its therapeutic efficacy. In this study, we present expression of poly (ADP-ribose) polymerase (PARP) during apoptosis induced by UV in HeLa $S_3$ cells. Four different assays were performed in this study: morphological assessment of apoptotic cells and cell viability, DNA fragmentation analysis by agarose gel electrophoresis, quantitative assay of fragmented DNA, and expression of PARP by the western blot analysis. The percentages of apoptotic HeLa $S_3$ cells irradiated with $75J/m^2$ UV was increased continuously from 3 hrs incubation. DNA ladder pattern was appeared at 6 hrs. The amount of nucleosomal DNA fragments in cells treated UV increased from 3 to 12 hrs incubation and gradually decreased. The cleavage of PARP in HeLa $S_3$ cells irradiated with UV was induced, and the cleavage of PARP was more delayed in the cells pretreated with $5J/m^2$ UV and subsequently irradiated with $75J/m^2$ UV. than that in the cells only irradiated with $75J/m^2$ UV. Thus these data suggest that the cleavage of PARP relates with DNA fragmentation associated with apoptosis.

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