• Parasites, Hosts and Diseases
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• v.29 no.3
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• pp.235-244
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• 1991

An epidemiological study and mass treatments of Enterobius vermicularis infection among children near Wonju area of Kangwon province were carried out. The children were divided into 4 groups according to their residing localities; children in the mountainous area, rural area, urban area and in orphanage. They were examined by adhesive cellotape anal swab technique, and egg positive rates were obtained. The rates of egg reduction and re-infection rates after repeated mass treatments were also observed. The results obtained were as follows: 1. The overall egg Positive rate of E. vermicularis in the first screening was 19.9% (251 out of 1, 262 examinees; 19.7% in males and 20.1% in females). The positive rates were 13.0% in the mountainous area, 11 9% in the rural area, 15.1% in the urban (medium-sized) area and 61.9% in orphanages. 2. The highest positive rates were observed in the kindergarten children, and 1st and 2nd grade children of primary schools (26.2~32.2%), and the lowest rate (13.6%) in 6-year grade children of primary schools. 3. Cumulative detection rates from 3 repeated anal swabs at 4~5 days interval were higher (70.8%) than those from single anal swabs (50.0~59.2%). 4. Out of the examinees who showed the highest cumulative positive rate (70.8%), about 39.2% were consecutively positive in 3 anal swabs. Among different groups of children, the higher the total egg detection rates (87.5%), the higher the consecutive positive rates (71.9%) . 5. A total of 2, 609 (male : female=1 : 12.4) worms were collected from 17 egg-positive cases treated with anthelinintics. The mean number of worms per child was 153 (range: 4-824) . 6. The egg-positive cases in several studied groups (180 children) were treated with anthelmintics 6 times at 3-week intervals. In this case, the overall positive rate was decreased from 54.8% to 2.2% at 15 weeks after the treatments, but no complete negative conversion was experienced. However, in a group of children (154 children) including egg Positive and negative cases who were both treated with anthelmintics at 3-week interval, a complete egg-negative conversion was observed in the 9th week after treatments. 7. The egg-detection rate in the brothers or sisters of egg Positive children was 70.0% (28 out of 40 examined), and the egg-positive rate according to the family unit was 69.7%. In summarizing the above results, it is concluded that Enterobius vermicularis infection is still highly prevalent among children in Korea, and that repeated mass treatments of more than 3 times will be effective for control of this infection.

• Journal of the Korea institute for structural maintenance and inspection
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• v.6 no.3
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• pp.193-199
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• 2002

Structral crack of RC structure generally occurs when the tension stress by applied load is larger than tension resistance of concrete, and it means deterioration of structure and the decrease of load resistance. Because structural crack of structure can occur critical damage to structure occasionally, the research on crack detection algorithm of RC structure is needed for assurance of structural safety and effective maintenance of structure. In this paper, we executed the laboratory test on measuring strain of RC beam's tension and compression zone, using strain gauge which is widely used on strain measurement of civil structure. By using measured strain, we analyzed strain change, elastic modulus change, and neutral axis change to detect crack of RC beam. As a result, we proposed the simple and effective crack detection algorithm using trends of neutral axis position change.

• Proceedings of the IEEK Conference
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• 2001.09a
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• pp.789-792
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• 2001

성능향상에 관한 실험을 하였다. 화자식별 방식은 등록된 음성과 테스트 음성을 비교하여 결정논리에 의하여서 화자를 식별하는 방식이다. 이러한 시스템에서 전처리(preprocessing)를 어떻게 해 주느냐에 따라서 인식률에 큰 영향을 미치게 된다. 본 논문에서는 전처리 과정 중에서 음성구간 검출에 대한 실험을 수행하여 성능을 비교 하였다. 본 논문에서는 시간영역에서 안정구간(stationary region)과 전이구간(transition region)에서 Normalized AMDF를 적용하였을 때 피치점에서 골(valley)의 기울기가 크다는 점을 이용하여 유성을 검출하였다. 그리고 검출된 유성음 구간 앞뒤로 인접 샘플의 자기상관관계함수(Autocorrelation)의 비를 이용하여 무성음을 검출하였다. 결과적으로 처리시간은 비슷하였으나 전체 인식률은 약 2%정도 개선되었다.

• Journal of the Korean Institute of Intelligent Systems
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• v.26 no.6
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• pp.464-470
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• 2016

In this paper, we propose an improved face detection algorithm and determination method for drowsiness status of driver from the opening and closing frequency of the detected eye. For this purpose, face, eyes, nose, and mouth are detected based on conventional Viola-Jones face detection algorithm and spatial correlation of face. Here the spatial correlation of face is performed by DFP(Detect Face Part) based on seven characteristics. The experimental results on Caltect face image database revealed that the detection rates of noise particularly showed the improved performance of 13.78% in comparison to that of the previous Viola-Jones algorithm. Furthermore, we analyze the driver's drowsiness determination cumulative value of the eye closed state as a function of time based on SVM (Support Vector Machine) and PERCLOS(Percentage Closure of Eyes). The experimental results confirmed the usefulness of the proposed method by obtaining a driver's drowsiness determination rate of 93.28%.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2019.06a
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• pp.118-119
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• 2019

본 논문에서는 비디오 제작 및 유통의 활성화에 따라 필요성이 높아지고 있는 장면 전환을 검출하는 방법을 제안한다. 유통 과정에서 해상도 변환, 자막 삽입, 압축, 영상 반전 등의 다양한 변형이 추가되더라도 동일하게 장면 전환을 검출해야 하므로 전처리 과정과 SIFT를 이용한 특징 추출, 변형을 고려한 매칭 방법을 이용하여 프레임 간의 매칭률을 계산한다. 또한 매칭률의 임계값을 기준으로 장면 전환 여부를 판단한다. 원본 비디오에서의 특징을 가지고 다양한 변형이 가해진 비디오에서의 특징과 매칭률을 계산하여 유효성을 판단한다.

• 대한방사선방어학회:학술대회논문집
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• 2011.11a
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• pp.146-147
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• 2011

• Journal of fish pathology
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• v.23 no.2
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• pp.155-163
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• 2010

The epidemiological study was performed to survey the prevalence of fish pathogens in cultured olive flounder, Paralichthys olivaceus from 2005 to 2007. In this study, the fish pathogens were detected from 1,528 among 2,238 fish samples collected yearly in 5 sites from February, May, August and November. Annual incidences for three years show a yearly increase and there were 60.6% in 2005, 66.7% in 2006 and 72.3% in 2007, respectively. Seasonal prevalence was 63.5% in February, 67.4% in May, 75.1% in August and 64.4% in November for three years. The detection rates of 6 viral pathogens were 35.6% in 2005, 44.6% in 2006 and 24.4% in 2007 and the peak rate was 55.4% at adult size group (above 41cm). Viral nervous necrosis virus (24.7%) has been the most predominant virus in this investigation, while much lower rates were noted in viral haemorrhagic septicemia virus (10.6%) and red sea bream iridovirus (0.9%).

• The Journal of Korean Academy of Prosthodontics
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• v.46 no.2
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• pp.116-124
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• 2008

Statement of the problem: Implant systems result in gaps and cavities between implant and abutment that can act as a trap for bacteria and thus possibly cause inflammatory reactions in the peri-implant soft tissues. Purpose: Porphyromonas gingivalis, Prevotella intermedia, Tannerella forsythia, Treponema denticola, and Aggregatibacter actinomycetemcomitans, related to implant-abutment interface microleakage. Material and methods: Samples were taken from 27 subjects with sterilized paper points and were transported in $1{\times}PBS$. The detection of periodontopathogens were performed by polymerase chain reaction with species-specific primers based on 16S rDNA. Results: Our data showed that the detection rate of P. gingivalis and P. intermedia in implant fixture was 59% and 82% in patients respectively. Detection rate of P. gingivalis and P. intermedia in implant crevice was 44% and 82% in patients. Detection rate of P. gingivalis and P. intermedias in tongue was 82% and 82% in patients. Conclusion: Current implant systems cannot safely prevent microbial leakage and bacterial colonization of the inner part of the implant.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.11 no.4
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• pp.131-143
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• 2012

In this paper, we propose a drowsy driver detection system with a novel eye state detection method that is adaptive to various vehicle environment such as glasses, light and so forth using SURF(Speed Up Robust Feature) which can extract quickly local features from images. Also the performance of eye state detection is improved as individual three eye-state templates of each driver can be made using Bayesian inference. The experimental results under various environment with average 98.1% and 96.1% detection rate in the daytime and at night respectively and those in the opened ZJU database with average 97.8% detection rate show that the proposed method outperforms the current state-of-the-art.

• Proceedings of the IEEK Conference
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• 2000.09a
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• pp.453-456
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• 2000

본 논문에서는 색상정보를 이용한 얼굴 검출 알고리즘에 대해 소개하고자 한다. 여러 개의 얼굴 검출에 적용되는 이 알고리즘은 피부색의 학습 과정과 입력영상에 대한 얼굴 검출 과정으로 크게 두 가지로 나눌 수 있다. 특히 본 연구에서는 피부색이 본 논문에서 제안한 새로운 RGB 영역에서 직선을 이루는 특징을 이용하여 학습 data를 구성한다. 이렇게 구성된 data를 입력영상에 적용함으로써 1차 얼굴 후보영역을 결정한다. 그런 후 1차 후보영역을 세로방향과 가로방향으로 투영시킴으로써 최종 얼굴 영역을 찾아낸다. 실험을 통해 이 알고리즘은 기존의 색상정보를 이용한 얼굴검출 방법에 비해 얼굴 개수에 상관없이 높은 검출 성공률을 보여주었다.