• 한국음향학회지
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• 제29권8호
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• pp.504-508
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• 2010

기존의 초음파 의료용 탄성영상에서 변형률 영상을 모니터에 표시할 때 인간 시각 특성을 반영하여 단단한 부위는 어둡게 표시하고 무를수록 밝게 나타낸다. 따라서 종양이나 암이 존재하는 단단한 부위는 어둡게 나타나서 병변 내부의 콘트라스트는 저하되어 나타난다. 병변 영역은 단단하여 변형률 영상에서 어둡게 나타나므로 병변 내부를 좀 더 자세히 진단하는 방법으로, 누른 후의 신호를 누른 변형률만큼 다시 신장시켜서 얻는 전역 균일 신장 방법을 적용하여 영상의 명암을 반전시킴으로써 병변 부분의 콘트라스트를 올리는 방법을 제안하였다. 의료용 초음파 영상 진단기를 이용하여 탄성 모사 팬텀에서 초음파 데이터를 얻어서 제안한 알고리즘을 검증하여 유용성을 확인하였다. 전역 균일 신장 없이 회색조 컬러 맵을 반전해서 얻은 변형률 영상법에 비해 콘트라스트 대 잡음비가 최대 1.8배 정도 향상되었다.

• 대한핵의학회지
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• 제8권1_2호
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• pp.39-47
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• 1974

The purpose of this study is to evalute the diagnostic value of the brain scanning and compare the diagnostic accuracy between the scan and carotid angiography. 109 cases which are proved by specific method to each disease, are analized to evalute the diagnostic value of the brain scanning. The 70 cases among the proven 109 case are performed both the scanning and the arteriography and analized to compare the accuracy between the scanning and the arteriography. The results are as follows; 1. The diagnostic accuracy of the brain scanning in the diseases of the central nervous system is 64.2%. 2. The diagnostic accuracy of the brain scanning in the brain tumor is 88%, especially brain abscess. glioma, glioblastoma multiforme, menirgioma and metastic tumor show high positive rate. 3. The diagnostic accuracy in the disease of the brain vessels is 54 %. 4. The comparison of the diagnostic value between the scanning and the arteriography is as follows; 1) The diagnostic value in all diseases of the central nervous system is nearly equal. 2) The diagnostic accuracy in the intracranial tumor is slightly higher in the brain scanning (90.9%) than in the arteriography (81.8%). 3) The diagnostic accuracy in the disease of the brain vessel is higher in the arteriography (77.3%) than in the scanning (54.5%). 5) The diagnostic value when combining the scanning and the arteriography, is 83% in the all central nervous system-lesions, 97% in the cranial tumor and 81.8% in the disease of the central nervous system-vessel. The brain scanning is simple and safe procedure, and moreover has excellent diagnostic value in the diagnosis of the central nervous system lesion.

• Communications for Statistical Applications and Methods
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• 제6권1호
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• pp.33-42
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• 1999

A method of detecting influential observations in principal factor analysis is suggested. it is based on a perturbation of the empirical distribution function and an adoption of the local influence method. An illustrative example is given.

• 전력전자학회논문지
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• 제18권3호
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• pp.217-224
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• 2013

This paper presents a diagnostic method for a sparse matrix converter that detects faults in any single switch or a pair of switches. The sparse matrix converter is functionally equivalent to the standard matrix converter but has a reduced number of switches. The proposed diagnostic method is based in the measurement of input and output currents. The currents have respective characteristic according to the location of faulty switches. This method not only detects the switches of open-circuit fault but identifies the location of the faulty switching devices without complicated calculations. The simulation and experimental results verify that, based on the proposed method, the fault of sparse matrix converter can be easily and fast detected.

• Journal of Electrical Engineering and Technology
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• 제10권4호
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• pp.1765-1772
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• 2015

The integrity of the gas insulated switchgear (GIS) is vital to the safety of an entire power grid. However, there are some limitations on the techniques of detecting and diagnosing partial discharge (PD) induced by insulation defects in GIS. This paper proposes a joint electro-chemical detection method to resolve the problems of incomplete PD data source and also investigates a new unique fault diagnosis method to enhance the reliability of data processing. By employing ultra-high frequency method for online monitoring and the chemical method for detecting SF6 decomposition offline, the acquired data can form a more complete interpretation of PD signals. By utilizing DS evidence theory, the diagnostic results with tests on the four typical defects show the validity of the new fault diagnosis system. With higher accuracy and lower computation cost, the present research provides a promising way to make a more accurate decision in practical application.

• 한국컴퓨터산업학회논문지
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• 제8권3호
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• pp.147-154
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• 2007

각 급 학교에서는 학습이 끝난 후에 실시하는 총괄평가의 결과만으로 학습평가를 하고 있는데 이러한 평가 방식은 학습자의 학습능력의 형성과정을 고려하지 않는 결과위주의 학습평가로 볼 수 있다. 또 기존의 학습평가는 학습 수행능력을 판정하기 위한 진단평가와 학습능력의 향상 정도를 측정하기 위한 형성평가를 각기 개별적으로 수행하여 평가하기 때문에 학습 수행능력을 보다 명확하게 처리하기 곤란한 점이 있다. 따라서 본 논문에서는 학습자의 능력을 보다 객관적으로 평가하기 위한 방안으로 퍼지 추론을 이용하여 진단평가와 형성평가를 통합 평가할 수 있는 학습평가 방법을 제안한다.

• Advances in pediatric surgery
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• 제13권1호
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• pp.66-71
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• 2007

There have been no definitive preoperative diagnostic imaging studies for impalpable testes. We observed the effectiveness of laparoscopy for detecting impalpable testes not identified with ultrasonography (USG) or careful physical examination under general anesthesia. We retrospectively reviewed 117 patients (118 testes) who were operated upon for undescended testes from January 1998 to December 2004. The testes of these patients were palpable in 97(82 %) and impalpable in 21 (18 %). We analyzed the preoperative diagnostic method, site of the testes, operative method and operative findings of the 21 impalpable testes. Preoperative USG and physical examination under general anesthesia were performed on 20 patients, and 12 patients' testes could be localized. Eight patients whose testes could not be localized with USG and physical examination underwent laparoscopy. Seven of the 8 patients had testes in inguinal canal and 4 of these were atrophied and underwent orchiectomy because of atrophy (2) and vanishing (2). Only 1 patient had bilateral intraabdominal testes and one of the testes was atrophied. Laparoscopy was a useful method for detecting impalpable testes, but the clinical application might be limited because the location of atrophic or vanishing testes was mainly inferior to internal inguinal ring.

• Pediatric Gastroenterology, Hepatology & Nutrition
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• 제16권1호
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• pp.53-60
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• 2013

In Crohn's disease, mild gastrointestinal bleeding often occurs; however massive gastrointestinal hemorrhage, which can have a dramatic effect on a patient's vital sign, is rare. This could result in potentially life-threatening complications, which can lead to death. Massive hemorrhagic Crohn's disease is not well known and for this reason, they are a diagnostic and therapeutic challenge. Various diagnostic and therapeutic methods are currently being developed and used. The surgical method is often used only as a last measure since this approach has the risk of serious complications that may endanger patients. However, if massive bleeding continues even after all therapeutic methods are used, the surgical method must be implemented. In this case, all therapeutic methods were found to be ineffective; therefore, surgery was used as a last option. Ultimately, the surgical method was found to be successfully used to treat life-threatening hemorrhagic Crohn's disease.

• 대한방사선기술학회지:방사선기술과학
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• 제20권1호
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• pp.51-54
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• 1997

This study is to evaluate the individual angulation on maxlliary sinus projection and establishing angulation in children by new geometrical method. There were two groups, which are 60 cases in children (ranged from 1yr to 3yrs, 3yrs to 8yrs, 8yrs to 12yrs) and 50 cases in adults. We analyzed the true lateral maxillary sinus film of total 110 patients using new geometrical method. We demonstrated an angle of maxillary sinus projection. Arithmetical average angulation in adults is 36.56 degrees that accord with Waters. Whereas it is not valid during development of facial bone in childhood. The individual range of angulation according to age was that 1yr to 3yrs is 50-47 degrees, 3yrs to 8yrs is 47-40 degrees, 8yrs to 12yrs is 40-38 degrees. This geomatrical method will be useful in establishing angulation for maxillary sinus profection.

• The Plant Pathology Journal
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• 제40권4호
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• pp.337-345
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• 2024

Soybean (Glycine max L.) is one of the most widely planted and used legumes in the world, being used for food, animal feed products, and industrial production. The soybean mosaic virus (SMV) is the most prevalent virus infecting soybean plants. This study developed a diagnostic method for the rapid and sensitive detection of SMV using a reverse transcription-recombinase polymerase amplification (RT-RPA) technique combined with a lateral flow strip (LFS). The RT-RPA and RT-RPA-LFS conditions to detect the SMV were optimized using the selected primer set that amplified part of the VPg protein gene. The optimized reaction temperature for the RT-RPA primer and RT-RPA-LFS primer used in this study was 38℃ for both, and the minimum reaction time was 10 min and 5 min, respectively. The RT-RPA-LFS was as sensitive as RT-PCR to detect SMV with 10 pg/µl of total RNA. The reliability of the developed RT-RPA-LFS assay was evaluated using leaves collected from soybean fields. The RT-RPA-LFS diagnostic method developed in this study will be useful as a diagnostic method that can quickly and precisely detect SMV in the epidemiological investigation of SMV, in the selection process of SMV-resistant varieties, on local farms with limited resources.