• Journal of Internet Computing and Services
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• v.10 no.3
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• pp.85-94
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• 2009

In this work we propose an energy-efficient transmission strategy for wireless sensor networks that operate in a strict energy-constrained environment. Our transmission algorithm consists of two components: a binary-decision based transmission and a channel-aware backoff adjustment. In the binary-decision based transmission, we obtain the optimum threshold for successful transmission via Markov decision process (MDP) formulation. A channel-aware backoff adjustment, the second component of our proposal, is introduced to favor sensor nodes seeing better channel in terms of transmission priority. Extensive simulations are performed to verify the performance of our proposal over fading wireless channels.

• Proceedings of the Korean Society for Bioinformatics Conference
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• 2001.08a
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• pp.11-35
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• 2001

For the last twenty years fragment assembly in DNA sequencing followed the "overlap - layout - consensus"paradigm that is used in all currently available assembly tools. Although this approach proved to be useful in assembling clones, it faces difficulties in genomic shotgun assembly: the existing algorithms make assembly errors and are often unable to resolve repeats even in prokaryotic genomes. Biologists are well-aware of these errors and are forced to carry additional experiments to verify the assembled contigs. We abandon the classical “overlap - layout - consensus”approach in favor of a new Eulerian Superpath approach that, for the first time, resolves the problem of repeats in fragment assembly. Our main result is the reduction of the fragment assembly to a variation of the classical Eulerian path problem. This reduction opens new possibilities for repeat resolution and allows one to generate error-free solutions of the large-scale fragment assemble problems. The major improvement of EULER over other algorithms is that it resolves all repeats except long perfect repeats that are theoretically impossible to resolve without additional experiments.

• Korean Journal of Organic Agriculture
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• v.26 no.3
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• pp.369-379
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• 2018

This study examines consumers' perception of agricultural products using nuclear power plants waste heat. This study surveyed 348 consumers and found that presenting information about safety of waste heat utilization increased appropriacy of waste heat; after providing the information, the percentage of respondents in favor of using waste heat increased 27.5% point from 38.3% to 65.8%. The most important reason against using waste heat was because it threatened the safety of agricultural products, and the most important reason for its support was to reduce farm production costs. The purchase intention for agricultural products using waste heat had risen by at least 10% point after providing the information about safety of waste heat. Those means that it important provision of accurate and reliable information on the safety of waste heat to encourage the utilization of waste heat from nuclear power plants. Purchase intention for flowers using waste heat was most, followed by vegetables, fruits (including fruits and vegetables).

• Journal of the Korean Statistical Society
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• v.35 no.2
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• pp.167-177
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• 2006

An important role of statistical analysis in science is interpreting observed data as evidence, that is 'what do the data say?'. Although standard statistical methods (hypothesis testing, estimation, confidence intervals) are routinely used for this purpose, the theory behind those methods contains no defined concept of evidence and no answer to the basic question 'when is it correct to say that a given body of data represent evidence supporting one statistical hypothesis against another?' (Royall, 1997). In this article, we use likelihood ratios to measure evidence provided by record values in favor of a hypothesis and against an alternative. This hypothesis is concerned on mean of an exponential model and prediction of future record values.

• Journal of Chest Surgery
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• v.9 no.2
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• pp.133-138
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• 1976

The author reviewed 263 cases of pulmonary tuberculosis operated on at the Department of Thoracic Surgery, Seoul National University Hospital during the 19 year period, from January, 1957 to December 1975. Following observations were made: 1) The sex ratio was 2.8: 1 in male's favor, and 83.6% of the patients were between 20 and 49 years of age. 2) The trends in operative procedures revealed that surgical collapse as a definitive therapy of pulmonary tuberculosis has virtually disappeared and operations required for residuals of pleural diseases have increased. 3) The overall hospital mortality rate was 3-8%. The highest mortality rate was encountered in the cases of resection and decortication with 28.6%, 4) The rate of overall postoperative complications was 24.7%, the highest being encountered in decortication with 56.4%. 5) The most frequent cause of death was bleeding, while the dead space was the most frequent complication.

• Journal of the Korea Safety Management & Science
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• v.6 no.2
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• pp.167-178
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• 2004

Supply chain management and e-procurement system built in the company, are set goal of internal process improvement. This paper show how SLV(Supplier Lifetime Value) can be used to structure the supplier in automotive part manufacturer, the method of selection is described and a detailed example of how SLV can be used and allocation of order Quantity for the selected suppliers also are provided, and aims at giving a method to realization profitable supplier relation using search for SL V system development which is making corporation with supplier, in the favor of decision supplier.

• Journal of Preventive Medicine and Public Health
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• v.44 no.1
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• pp.14-21
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• 2011

Objectives: The regulatory changes in Korea during the national economic crisis 10 years ago and in the current global recession were analyzed to understand the characteristics of deregulation in labor policies. Methods: Data for this study were derived from the Korean government's official database for administrative regulations and a government document reporting deregulation. Results: A great deal of business-friendly deregulation took place during both economic crises. Occupational health and safety were the main targets of deregulation in both periods, and the regulation of employment promotion and vocational training was preserved relatively intact. The sector having to do with working conditions and the on-site welfare of workers was also deregulated greatly during the former economic crisis, but not in the current global recession. Conclusions: Among the three main areas of labor policy, occupational health and safety was most vulnerable to the deregulation in economic crisis of Korea. A probable reason for this is that the impact of deregulation on the health and safety of workers would not be immediately disclosed after the policy change.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.11-12
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• 2011

In electromagnetic coupled resonance(ECR) WPT system, the main key for wireless power transmission is the design method of the ECR coils. The ECR coils is classified to the helical coil(3D) type and the spiral coil(2D) type as a coil structure. The pattern of the spiral coil type has been studied in favor of commercialization. In this paper, the design characteristics of the helical coil and the spiral coil is considered using a Vector Network Analyzer. It is analyzed according to the distance of coupling coefficient between the ECR coils. Also, It is analyzed for the relationships such as the maximum transmission efficiency and the resonant frequency depending on the distance between the coils.

• Journal of Chest Surgery
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• v.18 no.2
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• pp.334-340
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• 1985

The results of the clinical observations on the bronchogenic carcinoma of forty-five cases treated in the Department of Thoracic and Cardiovascular Surgery, Chungnam National University Hospital, during the period of 6 years from June.1978 to Aug. 1984, are as follows: 1. Of 45 cases, 44 cases were over 40 years of age and the sex ratio was 4.6:1 in male`s favor. 3. Among 50 cases, 45 cases were confirmed histopathologically. Of these, 30 cases [66.7%] were squamous cell carcinoma, 8 cases [17.8%] adenocarcinoma, and 7 cases [15.6%] undifferentiated cell carcinoma. 4. The thoracotomy was performed in 31 cases [68.9%] of 45 cases and the resection of the lesion in 16 cases [51.6%]. The empyema and bronchopleural fistula developed in 2 cases.

• Genomics & Informatics
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• v.5 no.4
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• pp.168-173
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• 2007

In previous nuclear genomic association studies, Random Forests (RF), one of several up-to-date machine learning methods, has been used successfully to generate evidence of association of genetic polymorphisms with diseases or other phenotypes. Compared with traditional statistical analytic methods, such as chi-square tests or logistic regression models, the RF method has advantages in handling large numbers of predictor variables and examining gene-gene interactions without a specific model. Here, we applied the RF method to find the association between mitochondrial single nucleotide polymorphisms (mtSNPs) and diabetes risk. The results from a chi-square test validated the usage of RF for association studies using mtDNA. Indexes of important variables such as the Gini index and mean decrease in accuracy index performed well compared with chi-square tests in favor of finding mtSNPs associated with a real disease example, type 2 diabetes.