• IE interfaces
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• v.18 no.3
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• pp.327-332
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• 2005

The call-attempt behavior in a telecommunications service is influenced by the launch of new services and the choice of subscribers. On Feb 28, 2005, there was a disastrous shut-down of major local electronic switching systems (ESS) due to an abrupt increase of call-attempts. This incident turned out to be a strong proof that appropriate forecasting attempts are necessary not only for the capacity planning of network but also for the quality control of ESS. In this paper, forecasting models are first developed to estimate the daily ESS call-attempts and user retrial rates and then meaningful interpretations of results will follow. Finally future research topics will be presented.

• Journal of Chest Surgery
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• v.26 no.7
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• pp.532-537
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• 1993

To assess the therapy of spontaneous pneumothorax in the aged patients, the treatment methods and results in 60 patients 50 years of age or older were retrospectively reviewed. Most of the patients were male [56 of 60 patients] and the major underlying lung diseases associated with spontaneous pneumothorax were tuberculosis [32 patients] and chronic obstructive lung disease [20 patients]. The recurrence rate of thoracostomy tube drainage with or without chemical pleurodesis using tetracycline was 39.6% [21 of 53 patients], but there was no recurrence in the patients treated with open thoracotomy, pleural abrasion, and chemical pleurodesis using talcum powder[Asbestosis free]. In the patients treated with open thoracotomy, the bullous or bleb lesions were placed in the various sites of both lungs. We concluded that even though thoracostomy tube drainage is the first choice of therapy for spontaneous pneumothorax in the aged patients, the recurrence rate is high, especially in the patients with persistent air leakage for more than 2 days, and the open thoracotomy with pleural abrasion and chemical pleurodesis using talcum powder can prevent the recurrence in the selected patients.

• The Korean Journal of Food And Nutrition
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• v.9 no.1
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• pp.12-20
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• 1996

The purpose of this study is to explore the daily meal pattern in Seoul families. The informations of this study were obtained from 443 housewives in Seoul during August 20 to September 20, 1994, by using questionnaires. The X2 test was applied to see the individual data. The following observations were made in this study. 57% of Seoul families had rice with side dish set three times a day, the first choice for rice substitute was bread In breakfast and noodle in lunch, 98% of the subjects had rice in dinner The change of tile meal pattern from boiled rice to bread and noodle was the result of social changes such as urbanization, heightening up of education level of woman and the resulting increase of woman employment. They were consumed 2~5 varieties of side dishes. The favorite were Kimchi and Cigag' and Guk. The major meal pattern In Seoul Is still the traditional one composed of boiled rice and side dishes.

• Journal of Chest Surgery
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• v.19 no.3
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• pp.381-384
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• 1986

Pulmonary aspergillosis is a relatively rare disease in Korea. Immune suppressive patients, resulting from misuse or long term therapy of antibiotics, steroid and anticancer chemotherapeutics tend to be vulnerable to pulmonary aspergillosis. This study is made to illustrate the clinical features, preoperative diagnosis and surgical role in the management is this diseases. In retrospective study of operative cases from May 1980 through July 1986, 10 cases were analysis. Hemoptysis and blood tinged sputum were the most common chief complaints. Major underlying pathology was cavitary lesion or bronchiectasis caused by pulmonary tuberculosis [5 cases]. 2 cases were disseminated form due to immune suppression. Anatomic location of lesion was in the upper lobe in half case. Systemic antifungal agent is helpful for invasive aspergillosis and Resection is the treatment of choice for localized fungus balls and symptomatic localized forms.

• International Journal of Human Ecology
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• v.10 no.1
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• pp.99-112
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• 2009

This study explored the consistency in service-learning courses through comparing course syllabi and faculty survey in order to incorporate a service-learning course into the Home Economics practicum. The first step was to examine how consistent were between the reasons for choice of service-learning and importance of overall civic learning goals, between the importance of civic learning goals and educational objectives on syllabus, and between planned activities and accomplished activities. This study collected the descriptive and quantitative data from the syllabi for service-learning courses and a faculty survey at Texas Tech University. The major findings were that there was meaningful consistency between: the reasons for choosing service-learning and the importance of overall civic learning goals, the importance of civic learning goals and educational objectives, and planned activities on syllabus assignment and accomplished activities on the faculty survey related to course components. Future research regarding service-learning course design would be required in detail, and practice in designing service-learning courses would be consistent between the syllabus and performance in actual courses.

• Tuberculosis and Respiratory Diseases
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• v.45 no.4
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• pp.896-901
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• 1998

Pulmonary arteriovenous malformation(PAVM) is an uncommon congenital anomaly. As pulmonary arteriovenous malformation is a direct communication between the branches of pulmonary artery and vein which originated from the malformation of capillary development, major disturbances in gas exchange can result. This malformation results in the several symptoms such as dyspnea, hemopyssis, cyanosis, and severe neurologic complaints. However, the most of patients are usually asymptomatic. Selective pulmonary angiography is well known the helpful diagnostic method. Recently, therapeutic embolization has been advocated as the treatment of choice for pulmonary arteriovenous malformations. We report a case of multiple pulmonary arteriovenous malformation, which was detected on the simple chest X-ray and successfully treated with coil embolization in a 19-year-old asymptomatic woman.

• The Transactions of the Korean Institute of Electrical Engineers
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• v.40 no.7
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• pp.706-717
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• 1991

In order to remove the assumption of full state availability which is one of the major difficulties with the practical realization of variable structure control systems,a new switching function with a dynamic structure is proposed. And the control performances of the output feedback variable structure control systems with the dynamic switching function are evaluated through simulation studies. The proposed dynamic switching function is driven by small number of measured output and input variables while conventional static switching function requires full state information. Therefore, the proposition of the dynamic swiching function makes practical implementation of output feedback variable structure control scheme possible for the systems with unmeasurable state variables, high order systems and large scale systems that the conventional variable structure control schemes with static switching function cannot be applied. In the variable structure control systems with the dynamic switching function, desired control performance can be guaranteed by proper choice of design parameters such as poles of switching function dynamic equation and switching control gains even though small number of measured output and input variables are provided as shown in simulation resuls.

• Steel and Composite Structures
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• v.27 no.2
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• pp.217-227
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• 2018

This paper utilizes 3D FEM to provide deeper insights about the structural behaviour of a 6.1 m span steel culvert, which was previously tested under extreme loading. The effect of different input parameters pertaining to the backfill soil has been investigated, where the structural response is compared to field measurements. The interface choice between the steel and soil materials was also studied. The results enabled to realize the major influence of the friction angle on the load effects. Moreover, the analyses showed some differences concerning the estimation of failure load, whereas reasons beyond this outcome were arguably presented and discussed.

• Korean Journal of Child Studies
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• v.18 no.2
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• pp.73-85
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• 1997

The purpose of the present study was to examine the role of semantic and syntactic knowledge in the first language acquisition of Korean classifiers. The elicited classifiers production test(EPT) was conducted to 105 children aged from 2 to 7. EPT consisted of 16 classifiers and two items for each classifier. 32 items were divided into 2 major semantic features: animacy and inanimacy. The semantic features of inanimacy were subcategorized into 3 features such as neutral, shape and function. The results revealed that; 1) children produced the correct structure of classification from the very early age with correct word order of the noun phrase showing early fundamental syntactic knowledge; 2) The earliest response pattern was to respond to all nouns in the same way using a neutral classifier showing no apparent semantic basis for their choice; 3) Children didn't show any preference for animate, shape, or function classifiers.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.32 no.4
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• pp.128-133
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• 2009

Brain drain of scientists and technologists to the United States from other countries is a phenomenal issue due to the potential developmental impacts it could have on sending countries. Immigration policies undoubtedly play the major part to shape the human resource outcomes. There has been a common sense explanation to the brain drain trend, which states that the lower English language requirements in the scientific and technology jobs compared to other high skill brain drain jobs offer immigrants more favorable employment opportunities. These and other language related variables are used with standard human capital model variables to assess the validity of the common sense proposition.