• Journal of Korea Multimedia Society
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• v.16 no.3
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• pp.336-341
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• 2013

Reliability analysis for various forms of data obtained from complicated electronic circuits is a necessary process for guaranteeing reliability of the system. Reliability assessment of a system starts from the estimation of failure function. A system can be composed of one item, but in most cases, several items are correlated to each other in one system. This study suggests an estimation method of failure function and reliabilities for infrequent failure events, by considering different form of data obtained from different systems. Estimates of failure function and reliabilities for complex systems composed of two or more items in parallel or in mixed connections can be done by further application of proposed method.

• Journal of Nuclear Fuel Cycle and Waste Technology(JNFCWT)
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• v.10 no.2
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• pp.87-96
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• 2012

With a view to determine a safe speed the limit of a manipulator arm, several experiments was performed with a multi-jointed manipulator in maintenance and decommissioning tasks of nuclear facilities. Under the simulated emergency conditions, which were generated with random combinations of manipulator arm speed, failure probability and failure type, response characteristics of human operators to various malfunctions of a manipulator arm were measured in terms of reaction time, number of false alarm, and number of misses. This paper demonstrated that failure type, manipulator axes and manipulator arm speed has significant effects on human reaction time. As a whole the reaction time was slightly increased with manipulator arm speed, which is showed somewhat different pattern due to failure type. The reaction time to an axis acting on a workpiece directly, which could flex and extend, was fastest and much more its standard deviation was small. Various factors which may affect safe speed were also described.

• 한국어정보학회:학술대회논문집
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• 2016.10a
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• pp.39-43
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• 2016

'형태소 깎는 노인'은 국어사 자료를 처리하는 고성능 자동 형태분석기의 개발이 난항을 겪고 있는 상황에서 수동으로 형태분석 작업을 하는 연구자들을 지원하기 위하여 개발된 형태분석 보조기이다. 인간과 기계의 분업을 통해 인간의 피로를 최대한 줄이고, 단순 반복 형태에 대해서는 정답을 확실하게 제안할 수 있다는 것이 특징이다. 국어사 자료에는 한국어 정보처리를 위해 필요한 어휘 사전이 없으므로, 문법형태소 사전을 만들어 이를 단서로 조사/어미부와 어간부를 구분하도록 하였다. 이를 통해 구축된 소규모 형태분석 말뭉치들이 장기적으로는 자동 형태분석기의 성능 개선에 일조할 수 있을 것으로 기대한다.

• Annual Conference on Human and Language Technology
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• 2016.10a
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• pp.39-43
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• 2016

'형태소 깎는 노인'은 국어사 자료를 처리하는 고성능 자동 형태분석기의 개발이 난항을 겪고 있는 상황에서 수동으로 형태분석 작업을 하는 연구자들을 지원하기 위하여 개발된 형태분석 보조기이다. 인간과 기계의 분업을 통해 인간의 피로를 최대한 줄이고, 단순 반복 형태에 대해서는 정답을 확실하게 제안할 수 있다는 것이 특징이다. 국어사 자료에는 한국어 정보처리를 위해 필요한 어휘 사전이 없으므로, 문법형태소 사전을 만들어 이를 단서로 조사/어미부와 어간부를 구분하도록 하였다. 이를 통해 구축된 소규모 형태분석 말뭉치들이 장기적으로는 자동 형태분석기의 성능 개선에 일조할 수 있을 것으로 기대한다.

• Korean Journal of Ichthyology
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• v.9 no.1
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• pp.114-120
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• 1997

Frequencies and the types of abnormal vertebrae in the juvenile of five cyprinid fishes collected from the Kumho River during 1995 and 1996 were examined. Types of vertebral anomalies in investigated species were spinal curvature, fused vertebrae, helical sutures of cetera and abnormal vertebrae with one or two additional spines. The frequencies and the types of vertebral anomalies were different among the species. Of all the examined species, the type with one or two additional spines showed the highest frequencies, 11.72~12.11%. The frequencies of fused vertebrae was 4.45~7.68%. Thes two types of vertebral anomalies were observed in all species. Among the several types of fused vertebrae, the frequencies of double fused vertebrae were higher than those of other types. Also, the incidence of fused vertebrae located in the caudal region of vertebral column was much higher than that in other regions. The percentages of spinal curvature and helical sutures of vertebrae in the investigated species were 0.02~0.15% and 0.02%, respectively. Among the examined specimens, vertebral anomalies include fused vertebrae and one or two additional spines were shown in the three species, Korean slender gudgeon (Squalidus gracilis majimae), False dace (Pseudorasbora parva) and Crucian carp (Carassius auratus). In addition to the two vertebral anomalies, spinal curvature was shown in the Korean gudgeon (Squalidus chankaensis tsuchigae). Dark chub (Zacco temmincki) had fused vertebrae, one or two additional spines, spinal curvature, and helical sutures of vertebrae. This species has the most variable vertebral anomalies. Frequencies of fused vertebrae and one or two additional spines in the all tested fishes were not related with their standard lengths measured. However, spinal curvature and helical sutures of vertebrae were shown only in the specimens smaller than 20mm in standard length.

• Journal of the korean academy of Pediatric Dentistry
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• v.42 no.2
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• pp.172-179
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• 2015

The developmental mechanism of root formation is a complex process. Hereditary and environmental factors may affect the morphology of the developing root. A total of 12 cases was presented with permanent first molars with abberant root morphology. Clinically, these teeth appeared as a normal crown. However, radiographically, the root was slender, twisted and characterized by irregular lengths. In addition, root trunk length was shorter and pulp chamber was obliterated. In these cases, periapical radiolucency and loss of lamina dura were often observed. In 6 cases, an abnormal root of the primary second molars were also present, as well as root malformation of permanent first molars. In 3 cases, permanent central incisors also had a dysmorphic crown. These cases almost all had medical history, such as premature birth, brain infection or congenital heart disease in infants. The present paper describes cases of permanent first molars with an abnormal root that are rarely reported in literature. This case may intensify the variation in the permanent first molar and is intended to reinforce the clinician's awareness of rare morphology of the roots.

• 한국방재학회:학술대회논문집
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• 2011.02a
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• pp.97-97
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• 2011

관로 및 맨홀에 퇴적된 유사는 우수관거의 통수능을 감소시키고 전체 우수관거 시스템의 효과를 저하시켜, 저지대 침수 및 맨홀역류의 원인이 되고 있다. 또한 관로의 최소 유속이 유지되지 않으면 오염물이 침전되고, 관로내의 유하시간이 길어져 침전물 부패로 인한 황하물질 및 악취 등이 발생될 수 있다. 따라서 관로의 유사와 관련된 주된 연구는 관로내의 유사거동 특성을 규명하는 것이었다. 그러나 맨홀에서의 유사퇴적 및 배출 등과 관련된 연구는 매우 미흡한 실정이다. 본 연구에서 유입관과 유출관이 일직선상으로 연결된 중간맨홀을 대상으로 수리실험을 실시하고, 맨홀형태(사각형, 원형), 유사유입형태(연속주입, 일정기간주입), 유사유입량 및 맨홀내부 구조변화에 따른 맨홀내 유사퇴적량을 확인하였다. 또한 맨홀내에 퇴적된 유사를 완전히 배출할 수 있는 관거 유속을 측정하였다. 유사퇴적량을 확인한 결과 맨홀내부의 구조변화가 없는 기본형에서는 유사유입형태가 연속주입 또는 일정기간주입인지와는 관계없이 유입유사량이 증가하면 퇴적량 또한 증가하였고, 맨홀형태가 사각형 또는 원형인지와도 관계없이 맨홀내부의 유사퇴적량은 비슷하였다. 기본형과 비교하여 맨홀내부에 벤칭을 설치하였을 경우 유사퇴적량을 50 % 이상 저감시킬 수 있었다. 이러한 결과는 사각형과 원형맨홀에서 동일하였으며 유사유입형태가 연속적으로 유입되는지 또는 일정기간동안만 순간적으로 유입되는지와도 관계없이 동일하였다. 그러나 벤칭이 설치된 사각형 맨홀의 경우 맨홀내부에 퇴적된 유사를 완전히 배출시킬 수 있는 유입관거유속이 기본형과 비교하여 30 % 증가하는 것으로 나타났다. 그러나 원형맨홀에서는 벤칭을 설치함으로써 유사 완전배출을 위한 관거유속 또한 저감시킬 수 있었다. 본 연구에서 제안한 개선안의 경우 사각형, 원형, 연속주입, 일정기간주입 등의 조건과 관계없이 퇴적량을 50 % 이상 저감시킬 수 있었고, 유사 완전배출을 위한 관거유속 또한 기본형과 벤칭이 설치된 맨홀과 비교하여 50 % 이상 저감시킬 수 있음을 실험적으로 확인하였다. 원형 맨홀의 경우 완전배출 관거유속은 벤칭설치 시와 같았지만 완전배출까지의 소요시간은 본 연구의 개선안이 현저히 짧았다. 따라서 본 연구를 통해 제시안 맨홀내부 구조변화 개선안이 흐름개선과 함께 맨홀내부에 퇴적되는 유사량을 저감시킬 수 있는데 효과가 있다고 판단된다.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.27 no.1A
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• pp.18-25
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• 2002

In this paper, the performance of three types of serial concatenated convolutional codes (SCCC) in AWGN (additive white Gaussian noise) channel is compared and analyzed. As results of simulations, it can be observed that Type I shows the best error performance at lower signal-to-noise ratio (SNR) region. However, Type III shows the best error performance at higher SNR region. It can be also observed the error floor that the performance cannot be improved even though increasing of the number of iterations and SNR at Type I. However, the performance of Type II and Type III are still improved over the five iterations at higher SNR without error floor. And BER performance of three types can be closed to upper bound of three types with increase of SNR. It can be also observed that the upper bound of Type III shows the best performance among the three types due to the greatest free distance.

• Journal of Oral Medicine and Pain
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• v.31 no.2
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• pp.121-126
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• 2006

Hypohidrotic ectodermal dysplasia refers to a group of disorders with the following common features : thin, sparse or absent hair, missing or peg-shaped teeth and inability to sweat adequately. Both the primary and secondary dentition are affected. Teeth may be absent (anodontia) or reduced in number (oligodontia) and abnormally shaped. In case, A 5-year-old man presented with hypohidrosis and dry skin. He had no teeth in mouth. We report a case of hypohidrotic ectodermal dysplasia with anodontia.

• Journal of Korean Academy of Oral and Maxillofacial Radiology
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• v.11 no.1
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• pp.7-22
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• 1981

A morphological and positional classification was undertaken in the transcranial and transorbital views of 174 traceable films which had been selected from those of 274 patients and previous tracing was performed. For the positional analysis, the author adopted the method which is not influenced by TMJ remodelling, and for the morphological classification, made progress the general method by adding indefinite type to four basic types. The aims of this sutudy consists in performing positional and morphological analysis of condylar head and in its morphological and positional variation in symptomatic patients. I want to express my sincere gratitude to Prof. Park, Tae Won in Seoul National University, interesting me in this field researches and for his never failing interests. I would lide to thank Prof. Ahn, Hyung Kyu and Prof. You, Dong Soo for helpful discussion and critical readings. The author is also indebted to Prof. Fuchihate Hajime in Osaka University, Prof. Uemura, Shusaburo and the late Dr. Nishihara, Heihachi for fruitful discussion and encourgements.