• 대한원격탐사학회:학술대회논문집
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• 대한원격탐사학회 2003년도 Proceedings of ACRS 2003 ISRS
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• pp.429-431
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• 2003

The induced learning retardation method involves the temporary inhibition of the artificial neural network’s active units from participating in the error reduction process during training. This stimulates the less active units to contribute significantly to reduce the network error. However, some less active units are not sensitive to stimulation making them almost useless. The network can then be pruned by removing the less active units to make it smaller and more efficient. This study focuses on making the network more efficient and accurate by developing the induced learning retardation and pruning sequence training method. The developed procedure results to faster learning and more accurate artificial neural network for satellite image classification.

• 한국광학회지
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• 제25권5호
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• pp.262-272
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• 2014

두 개의 회전하는 사분파장판을 가진 타원편광분석기에서 광학계가 오차를 포함하지 않는 경우와 5가지의 체계적 오차(두 개의 사분파장판의 정렬오차와 지연오차, 검광판의 정렬오차)를 포함하는 경우에 측정신호를 핏팅하여 구한 퓨리어 계수와 뮬러매트릭스와의 관계를 분석하였다. 5가지 체계적 오차를 포함하는 경우 전산모사를 이용해 비교 분석한 결과 사분파장판의 지연 오차가 정렬오차보다 뮬러매트릭스 대각선 요소에 야기하는 오차가 더 크다는 것을 찾아내었다. 각속도의 회전비를 1:5로 선택시 첫 번째 사분파장판의 초기 정렬오차와 두 번째 사분 파장판의 초기 정렬오차가 뮬러 매트릭스에 야기하는 오차가 같다는 것을 전모사를 통해 찾아 내었다. 5가지 체계적인 오차를 전산모사를 통해 분석한 결과 검광판의 정렬오차(${\epsilon}_5$)가 야기하는 뮬러 매트릭스 오차와 사분파장판의 정렬오차(${\epsilon}_3$, ${\epsilon}_4$)가 야기하는 뮬러 매트릭스 오차를 비교하면 대각선 요소($m_{22}$와 $m_{33}$)의 상대 오차는 0.18%이며 비 대각선요소($m_{23}$와 $m_{32}$)는 2배 차이가 남을 찾아내었다. 이 결과들을 활용하여 측정대상 물질의 보다 정확한 뮬러매트릭스를 얻을 수 있다.

• 조명전기설비학회논문지
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• 제27권11호
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• pp.1-6
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• 2013

It is introduced the phase error sources of a incoherent hologram in incoherent triangular holography and derived the reconstruction image of point-source including the phase error in the lateral direction. From the reconstruction image of point-source, we analyzed the effect of phase error on the lateral resolution. When the phase retardation errors and azimuth angle error of a wave plate and a polarizer range from 0 to $2{\pi}/15$, the normalized intensities of reconstructed images are down by about 0.1% and 2.3%, respectively.

• 조명전기설비학회논문지
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• 제21권4호
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• pp.80-87
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• 2007

This paper will suggest that the 1 cross orthogonal loop type sensor improves on the orthogonal loop form sensor-head, which is available a calibration of the linear birefringence, when a fiber optic current sensor was composed. An output characteristics of the 1 cross orthogonal loop form, a general closed loop form, the orthogonal loop form are compared by the IEC(International Electrotechnical Commission) 60044-8 standard, and the state of polarization is compared with three forms. As a result, when the closed loop form was changed to the orthogonal loop form, retardation decreased 15.3[%]. When the closed loop form was changed to the 1 cross orthogonal loop type, the retardation decreased 33.8[%]. As a result of the Faraday Effect measurement, the 1 cross orthogonal loop form has the highest output characteristic and the lowest error ratio. It met the 0.5 class of the IEC 60044-8 standard. Thus, in application of the 1cross orthogonal loop form, the possibility to develop high reliability fiber optic current sensors that have a high output and stable error ratio rises is increased.

• 한국광학회지
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• 제20권4호
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• pp.241-248
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• 2009

액정 디스플레이에서 시야각 향상을 위해 사용하는 보상판과 편광판을 접합한 복합판의 광축 틀어짐 오차와 보상판의 $R_{in}$(in-plane retardation), $R_{th}$(out-of-plane retardation)를 동시에 결정하는 새로운 방법을 제시하였다. 보상판은 광축이 임의의 기울임각과 방위각을 갖는 o-판으로 하였으며, 확장된 존스 행렬법에 기반한 광학모델을 도입하여 복합판의 편광특성을 분석하였다. 입사각 0도와 50도에서 시료의 방위각을 360도 회전시키며 투과된 빛의 편광상태를 각각 계산한 후, 타원법의 모델링 분석기법을 적용하여 광축 틀어짐과 복합판의 기울임각과 방위각들을 역방계산하였다. 이 방법은 편광판과 보상판을 접합한 후에도 복합판의 성능평가를 할 수 있어 제조공정단계를 줄여 제조 원가를 절감하는데 기여할 수 있을 것으로 기대된다.

• 대한음성학회:학술대회논문집
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• 대한음성학회 2007년도 한국음성과학회 공동학술대회 발표논문집
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• pp.155-157
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• 2007

Objective : There are close relationship between intraoral abnormal structure and speech-functional problem. Patients with cleft palate & ankyloglossia are typical examples. Patients with abnormal structure can be repaired toward normal structure by operation. Ankyloglossia may cause functional limitation - for example, speech disorder - even if adequate surgical treatment were done. And, each individuals have each speech disorders. The objective of this study is to evaluate the speechs of childrens with ankyloglossia, and to determine whether ankyloglossia is associated with articulation problem. We wanted to present criteria for indication of frenectomy. Study design The experimental group is composed of 10 childrens who visited our department of oral and maxillofacial surgery, dental hospital, Chonbuk university, due to ankyloglossia and articulation problem,. The average age is 5 Y 7M, M : F ratio is 4 : 1 at the time of speech test. The VPI consonant discrimination degree, PPVT, PCAT, Nasometer II, Visi-Pitch test result were obtained from each group. Result : There was significant difference for 'language development' through PPVT. Except 3 members of experimental group, all remainder showed retardation for 'language development'. For 'errored consonant rate', data showed more higher scores in alveolar consonant. There 'consonant error' in experimental group, mostly showed 'alveolar consonant', also a major modality of 'consonant error' was mostly distortion. Conclusion : We can judge the severity of ankyloglossia patient by examinig language development degree & speech test of 'alveolar consonant' . And we can make a decision for frenulotomy using these results.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 1986년도 한국자동제어학술회의논문집; 한국과학기술대학, 충남; 17-18 Oct. 1986
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• pp.352-355
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• 1986

In this paper, some candidates suggested for the improvement of the robustness in adaptive control systems are shortly surveyed. Using dead zone concept of error in adaptation process, gain retardation methods such as .sigma.-modification and parameter restriction method are those considered. Feedforward compensation and normalized adaptation technique are also considered. New modeling technique suggested by Donati et al is used for the indirect control of plants containing unmodeled dynamics. The frequency band of input signal, which is used as a test signal and control signal simultaneously, is directly related to the control of plants containing high frequency parastics. Computer simulation results of the some selected algorithms are shown.

• Journal of Interdisciplinary Genomics
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• 제5권1호
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• pp.5-11
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• 2023

β-ureidopropionase (β-UP) is an enzyme that catalyzes the final step in the pyrimidine degradation pathway, which converts β-ureidopropionate and β-ureidoisobutyrate into β-alanine and β-aminoisobutyrate, respectively. β-UP deficiency (UPB1D; OMIM # 613161) is an extremely rare autosomal recessive inborn error disease caused by a mutation in the UPB1 gene on chromosome 22q11. To date, approximately 40 cases of UPB1D have been reported worldwide, including one case in Korea. The clinical manifestations of patients with UPB1D are known to be diverse, with a very wide range of manifestations being previously reported; these manifestations include completely asymptomatic, urogenital and colorectal anomalies, or severe neurological involvement, including global developmental delay, microcephaly, early onset psychomotor retardation with dysmorphic features, epilepsy, optic atrophy, retinitis pigmentosa, severely delayed myelination, and cerebellar hypoplasia. Currently, diagnosis of UPB1D is challenging as neurological manifestations, MRI abnormalities, and biochemical analysis for pyrimidine metabolites in the urine, plasma, and cerebrospinal fluid also need to be confirmed by UPB1 gene mutations. Overall, treatment of patients with UPB1D is palliative as there is still no definitive curative treatment available.

• 한국통신학회논문지
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• 제17권2호
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• pp.142-152
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• 1992

본 논문에서는 광파이버 센서로써 고전계(고전압)측정의 어려움을 해결하기 위하여 지금까지 알려진 다른 전기광학 소자보다 반파장 전압이 매우 높은 SiO2를 사용하여 고전계을 계측하기 위한 새로운 방법을 제시 하였다. SiO2를 비롯한 광학소자로 구성된 센서내부, 즉 전광자 및 편광자에서의 광변조식을 Stokes Parameter와 Mueller 행렬로 유도 하였고 이를 복굴절 결정에서의 전기광학 효과를 이론적으로 해석하고 위상지연과 반파장 전압을 계산하였다. 설계 제작한 광전압 센서에 , 분압없이 최대전압 20KV까지 공급 했을때의 출력신호를 검출한 결과 오차는 3%미만으로서 매우 우수한 직선성을 얻었다. SiO2의 온도변화(-20~60$^{\circ}$C)에 따른 출력전압 변화를 실험한 결과 최대 7.5%까지 변동율이 발생하였으나 열처리 한후로는 1.0% 이내로 개선된 특성을 보였다.

• 대한유전성대사질환학회지
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• 제2권1호
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• pp.7-11
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• 2002

저자들은 잘 교정되지 않는 대사성 산혈증을 주소로 내원한 3세된 남아와 원인 모르는 기면과 구토로 5차례 입원했던 과거력을 가진 8세된 남아 형제가 유기산 분석에서 isovalerylglycine의 현저한 증가를 보여 만성 간헐형의 isovaleric acidemia로 진단된 예와 탄뎀질량분석검사에서 isovaleric acidemia로 진단되어 조기치료하고 있는 예를 경험하였기에 보고하는 바이다.