• Journal of Chest Surgery
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• 제23권4호
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• pp.676-682
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• 1990

From August, 1978, to August, 1989, 22 patients underwent pericardiectomy for chronic constrictive pericarditis on the Department of Thoracic and Cardiovascular Surgery, School of Medicine, Keimyung University. There were 14 male and 6 female patients ranging from 11 years to 70 years old[mean age, 44. 1 years]. All patients underwent radical pericardiectomy through a median sternotomy. There was 1 postoperative death[4.s%]. This patient died of low cardiac output 7 days after pericardiectomy. Postoperative complications were hemothorax[2 patients], low cardiac output[2 patients], generalized seizure[1 patient], wound infection[1 patient] and pneumonia[1 patient]. Clinical and pathological findings showed tuberculous origin in 12 patients[54.6%], unknown etiology in 8 patients[36.4%] pyogenic pericarditis in 2 patients[9.1%]. Three hemodynamic responses to pericardiectomy were observed: [1] rapid response, where central venous pressure[CUP] fell below 10 cmH2O by 24 hours in 6 patients; [2] delayed response. Where CVP fell below 10 cmH2O by 48 hours in 12 patients; and [3] no response of CVP in 4 patients. Follow-up ranged from 6 to 62 months with an average of 35.3 months. Postoperative Functional Class was obtained for 21 surviving patients and showed 18 patients[81.8%] to be New York Heart Association functional class I or II.

• 건축역사연구
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• 제16권4호
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• pp.23-36
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• 2007

Many researches on the typology of 'Maru' (Wooden deck) in Korean traditional houses have mainly focused on the high-class houses in the central region of Korea. They were mainly concerned on defining Maru's typology by social status of the owner, based on the researches regarding its physical and spatial properties. Maru in the high-class traditional houses has been served as an essential architectural feature showing the social status of owners as well as adapting in the region of humid and hot summer. This research investigated the typology of Maru's placement in traditional single houses of four Kan in Chonnam province, which shows many differences in its placement according to the regions. Research results show that the typology of Maru's placement and openness is different with the location of houses within the region. This difference affects on the circulation of movement, which eventually affects on the pattern of space use. The difference is also very likely to be affected by the natural environment of geography and climate of the region.

• 패션비즈니스
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• 제8권6호
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• pp.57-67
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• 2004

The forms of man's costumes in Byzantine Empire were changed according to each composition of costumes. Those forms of costumes had common features of each period when costumes were included. At the same time, however, the fact that differences existed in accordance with a social position including gender, class, occupation, etc. even though in same period were showed. Analytic elements of man's costumes in Byzantine Empire were selected by important factors. This showed the meanings of position and class in that time. The kinds of analytic elements in man's outwear were various but the forms of costumes were not developed because christianity influenced the forms of clothing in the Middle Ages. As the result of synthesis, the main factor of man's costumes was a tunic in Byzantine Empire of the Middle Ages The phases of the times were reflected on the structure of man's costumes in Byzantine Empire. In particular, religious feature was emphasized, and analytic elements of costumes having meanings showed the features of the society at the Middle Ages. For example, a central analytic element of man's costume, an outer garment was a tunic style of H-silhouette that hid the body line. This was influenced by the phases of the times. Namely, the costume stands as a symbol of the times, and also is a cultural sign that reflects phases like politics, economy, religion.

• 한국학교ㆍ지역보건교육학회지
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• 제4권
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• pp.157-169
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• 2003

This research was intended to have a grasp of the problems in physical education curriculum, After making an alternative plans of effective management. those were integrated and analyzed their own relations on the purpose of suggesting alternative plans to foster professionality of physical education teacher in order to improve real class of physical education. For this purpose, I referred to sundry records related with instruction of physical education teacher and also conducted a survey with 10 interviews such as researchers of central government education administration, and school commissioners in the ministry's provincial offices of education, professors in the university of pre-teacher training, and teachers involved in physical education. The conclusions were as follows; Physical education curriculum should be organized to reduce and diversify of the sport contents in various levels. Also, it should instruct students based on physical educational knowledge, and it is made up to know the achievement of goals through evaluation tools and development of rules having propriety and reliability. Such a physical educational curriculum developed from real class should inform continuously throughout the Ministry of Education & Human Resources Development and educational organization of physical education teachers and network of the school and mass media. So, it makes most people's recognition raise up, and we need discretionary authority of physical education teacher about time allocation of 45 minutes or 50 minutes for variety of lessons. And we need systematic installation such as reorganization of completion field in level of school.

• ETRI Journal
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• 제41권3호
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• pp.358-370
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• 2019

The main aim of this study is to select the optimal set of genes from microarray cancer datasets that contribute to the prediction of specific cancer types. This study proposes the enhancement of the feature selection filter algorithm based on Joe's normalized mutual information and its use for gene selection. The proposed algorithm is implemented and evaluated on seven benchmark microarray cancer datasets, namely, central nervous system, leukemia (binary), leukemia (3 class), leukemia (4 class), lymphoma, mixed lineage leukemia, and small round blue cell tumor, using five well-known classifiers, including the naive Bayes, radial basis function network, instance-based classifier, decision-based table, and decision tree. An average increase in the prediction accuracy of 5.1% is observed on all seven datasets averaged over all five classifiers. The average reduction in training time is 2.86 seconds. The performance of the proposed method is also compared with those of three other popular mutual information-based feature selection filters, namely, information gain, gain ratio, and symmetric uncertainty. The results are impressive when all five classifiers are used on all the datasets.

• 한국전기전자재료학회논문지
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• 제36권6호
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• pp.547-555
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• 2023

High-density crossbar arrays based on storage class memory (SCM) are ideally suited to handle an exponential increase in data storage and processing as a central hardware unit in the era of AI-based technologies. To achieve this, selector devices are required to be co-integrated with SCM to address the sneak-path current issue that indispensably arises in such crossbar-type architecture. In this perspective, we first summarize the current state of tellurium-based threshold-switching devices and recent advances in the material, processing, and device aspects. We thoroughly review the physicochemical properties of elemental tellurium (Te) and representative binary tellurides, their tailored deposition techniques, and operating mechanisms when implemented in two-terminal threshold switching devices. Lastly, we discuss the promising research direction of Te-based selectors and possible issues that need to be considered in advance.

• Geomechanics and Engineering
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• 제37권6호
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• pp.565-576
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• 2024

In this study, the earthquake risk assessment of single-story RC precast buildings in Turkey was carried out using loss curves. In this regard, Kocaeli, a seismically active city in the Marmara region, and this building class, which is preferred intensively, were considered. Quality and period parameters were defined based on structural and geometric properties. Depending on these parameters, nine main sub-classes were defined to represent the building stock in the region. First, considering the mean fragility curves and four different central damage ratio models, vulnerability curves for each sub-class were computed as a function of spectral acceleration. Then, probabilistic seismic hazard analyses were performed for stiff and soft soil conditions for different earthquake probabilities of exceedance in 50 years. In the last step, 90 loss curves were derived based on vulnerability and hazard results. Within the scope of the study, the comparative parametric evaluations for three different earthquake intensity levels showed that the structural damage ratio values for nine sub-classes changed significantly. In addition, the quality parameter was found to be more effective on a structure's damage state than the period parameter. It is evident that since loss curves allow direct loss ratio calculation for any hazard level without needing seismic hazard and damage analysis, they are considered essential tools in rapid earthquake risk estimation and mitigation initiatives.

• 마이크로전자및패키징학회지
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• 제31권2호
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• pp.45-53
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• 2024

The maintenance of semiconductor equipment is crucial for the continuous growth of the semiconductor market. System management is imperative given the anticipated increase in the capacity and complexity of industrial equipment. Ensuring optimal operation of manufacturing processes is essential to maintaining a steady supply of numerous parts. Particularly, monitoring the status of substrate transfer robots, which play a central role in these processes, is crucial. Diagnosing failures of their major components is vital for preventive maintenance. Fault diagnosis methods can be broadly categorized into physics-based and data-driven approaches. This study focuses on data-driven fault diagnosis methods due to the limitations of physics-based approaches. We propose a methodology for data acquisition and preprocessing for robot fault diagnosis. Data is gathered from vibration sensors, and the data preprocessing method is applied to the vibration signals. Subsequently, the dataset is trained using Gradient Tree-based XGBoost machine learning classification algorithms. The effectiveness of the proposed model is validated through performance evaluation metrics, including accuracy, F1 score, and confusion matrix. The XGBoost classifiers achieve an accuracy of approximately 92.76% and an equivalent F1 score. ROC curves indicate exceptional performance in class discrimination, with 100% discrimination for the normal class and 98% discrimination for abnormal classes.

• 대한치과교정학회지
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• 제24권1호
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• pp.149-159
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• 1994

The purposes of present study were to evaluate changes in models and lateral cephalometric head films during orthodontic treatment and to compare the amount of incisal retraction and anterior movement of molars with the two approaches of the retraction method of canine(sectional canine retractions vs sliding canine retractions) and the anchorage management(head gears vs no head gears, transpalatal arches vs no transpalatal arches and lingual arches vs no lingual arches) and to evaluate changes during orthodontic treatment in models with relation to lateral cephalometric head films. 67 Korean women with Angle's Class I bialveolar protrusion were selected, whose initial chronologic age was above 16 yrs. Models and lateral cephalometric head films were taken before and after orthodontic treatment with four bicuspid extraction. the results were obtained as follows. 1. Significant decreases were observed in intermolar width, arch length and arch perimeter of maxilla and mandible but significant difference was not observed in intercanine width of maxilla and mandible during treatment period. 2. The linear change of the upper incisor to upper lip was 2.84:1 and the linear change of the lower incisor to lower lip was 1.45:1 3. There were no significant differences between the two groups(sectional canine retractions vs sliding canine retractions), the !we groups(transpalatal arches vs no transpalatal arches) and the two groups(lingual arches vs no lingual arches) in the amount of incisal retraction and anterior movement of molars. There were a greater amount of maxillary incisal retraction and a lesser amount of anterior movement of maxillary molars with the use of head gears than no use of head gears. 4. Changes during orthodontic treatment in models with relation to lateral cephalometric head films were obtained as follows : 1) Maxilla Central incisors were moved 3.79mm backward, canines were moved 0.22mm laterally and 3.70mm backward, and molars were moved 0.535mm medially and 2.29mm forward. 2) Mandible Central incisors were moved 3.04mm backward, canines were moved 0.145mm laterally and 3.92mm backward, and molars were moved 0.755mm medially and 1.77mm forward.

• 한국산림과학회지
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• 제88권2호
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• pp.195-204
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• 1999

채종원(採種園) 관리를 위해 개발된 여러 수종의 다양한 수형 조절 방법의 검토 및 이미 수형 조절 작업을 받은 16년생 접목 잣나무의 성장 조사와 I영급~III영급 조림지 임목의 성장 조사를 통하여 잣나무 인공림에서 잣과 목재를 생산할 수 있는 수형과 그 조절 방법을 제시하였다. 제 1형은 I~II영급에 잣 생산만을 위해 적용할 수 있는 방법으로 지상 1m 정도의 힘센 생지(生枝)를 포함하여 1m 정도 간격으로 4~5마디까지 남기고 단간(斷幹)하되 각 마디에 3~4개의 일차지(一次枝)를 윤생(輪生)으로 배치하는 변칙주간형(變則主幹型)이고, 제 2형은 잣과 목재 생산을 함께 도모하는 II영급~III영급에 적용이 가능한 방법으로 힘센 첫 생지 (지표에서 4m~8m)의 아래 부분은 무절(無節) 주간(主幹)으로 성장시키고 그 위는 1m 정도 간격으로 최고 4~5마디까지 남기고 단간하되 각 마디에 3~4개의 일차지를 윤생으로 배치하는 변칙주간형이며, 제 3형은 목재 생산만을 위해 지하고(枝下高)가 9m를 넘는 잣나무를 강도(强度)의 가지치기로 주간형(主幹型)을 이루게 하여 곧고 빠른 주간의 성장을 도모하는 방법이다.