• Structural Engineering and Mechanics
• /
• v.42 no.4
• /
• pp.531-549
• /
• 2012

Numerous oil tanker losses have been reported and one of the possible causes of such casualties is caused by the structural failure of aging ship hulls in rough weather. In aging ships, corrosion and fatigue cracks are the two most important factors affecting structural safety and integrity. This research is about effect on hull girder ultimate strength behavior of double hull oil tanker according to corrosion after Part I: stiffened panel. Based on corrosion data of Part I (time-dependent corrosion wastage model and CSR corrosion model), when progressing corrosion of fourtypes of double hull oil tankers (VLCC, Suezmax, Aframax, and Panamax), the ultimate strength behavior of hull girder is compared and analyzed. In case of the ultimate strength behavior of hull girder, when occurring corrosion, the result under vertical and horizontal bending moment is analyzed. The effect of time-dependent corrosion wastage on the ultimate hull girder strength as well as the area, section modulus, and moment of inertia are also studied. The result of this research will be useful data to evaluate ultimate hull girder strength of corroded double hull oil tanker.

• Structural Engineering and Mechanics
• /
• v.42 no.4
• /
• pp.507-530
• /
• 2012

Age-related problems especially corrosion and fatigue are normally suffered by weatherworn ships and aging offshore structures. The effect of corrosion is one of the important factors in the Common Structural Rule (CSR) guideline of the ship design based on a 20 or 25 years design life. The aim of this research is the clarification of the corrosion effect on ultimate strength of stiffened panels on various types of double hull oil tankers. In the case of ships, corrosion is a phenomenon caused by the ambient environment and it has different characteristics depending on the parts involved. Extensive research considering these characteristic have already done by previous researchers. Based on this data, the ultimate strength behavior of stiffened panels for four double hull oil tankers such as VLCC, Suezmax, Aframax, and Panamax classes are compared and analyzed. By considering hogging and sagging bending moments, the stiffened panels of the deck, inner bottom and outer bottom located far away from neutral axis of ship are assessed. The results of this paper will be useful in evaluating the ultimate strength of an oil tanker subjected to corrosion. These results will be an informative example to check the effect of ultimate strength of a stiffened panel according to corrosion addition from CSR for a given type of ship.

• Structural Engineering and Mechanics
• /
• v.51 no.5
• /
• pp.755-771
• /
• 2014

Environmental changes, especially global climate change, are creating new challenges to the development of the Arctic regions, which have substantial energy resources. And attention to offshore structures has increased with oil and gas development. The structural impact response of an explosion-resistant profiled blast walls normally changes when it operates in low temperatures. The main objectives of this study are to investigate the structural response of blast walls in low temperature and suggest useful guidelines for understanding the characteristics of the structural impact response of blast walls subjected to hydrocarbon explosions in Arctic conditions. The target temperatures were based on the average summer temperature ($-20^{\circ}C$), the average winter temperature ($-40^{\circ}C$) and the coldest temperature recorded (approximately $-68^{\circ}C$) in the Arctic. The nonlinear finite element analysis was performed to design an explosion-resistant profiled blast wall for use in Arctic conditions based on the behaviour of material properties at low temperatures established by performing a tensile test. The conclusions and implications of the findings are discussed.

• Genes and Genomics
• /
• v.40 no.11
• /
• pp.1149-1155
• /
• 2018

Epileptic encephalopathies are genetically heterogeneous disorders which leads to epilepsy and cause neurological disorders. Seizure threshold 2 (SZT2) gene located on chromosome 1p34.2 encodes protein mainly expressed predominantly in the parietal and frontal cortex and dorsal root ganglia in the brain. Previous studies in mice showed that mutation in this gene can confers low seizure threshold, enhance epileptogenesis and in human may leads to facial dysmorphism, intellectual disability, seizure and macrocephaly. Objective of this study was to find out novel gene or novel mutation related to the gene phenotype. We have identified a large consanguineous Saudi family segregating developmental delay, intellectual disability, epilepsy, high forehead and macrocephaly. Exome sequencing was performed in affected siblings of the family to study the novel mutation. Whole exome sequencing data analysis, confirmed by subsequent Sanger sequencing validation study. Our results showed a novel homozygous mutation (c.9368G>A) in a substitution of a conserved glycine residue into a glutamic acid in the exon 67 of SZT2 gene. The mutation was ruled out in 100 unrelated healthy controls. The missense variant has not yet been reported as pathogenic in literature or variant databases. In conclusion, the here detected homozygous SZT2 variant might be the causative mutation that further explain epilepsy and developmental delay in this Saudi family.

• Mycobiology
• /
• v.40 no.2
• /
• pp.107-110
• /
• 2012

Genes encoding the cellobiohydrolase enzyme (CBHI), designated as cbhI, were isolated from the basidiomycetes Auricularia fuscosuccinea, Pleurotus giganteus, P. eryngii, P. ostreatus, and P. sajor-caju. Initially, the fungal genomic DNA was extracted using a modified cetyltrimethyl ammonium bromide (CTAB) protocol and used as a DNA template. The cbhI genes were then amplified and cloned using the pGEM-T Easy Vector Systems. The sizes of these PCR amplicons were between 700~800 bp. The DNA sequences obtained were similar showing high identity to the cbhI gene family. These cbhI genes were partial consisting of three coding regions and two introns. The deduced amino acid sequences exhibited significant similarity to those of fungal CBHI enzymes belonging to glycosyl hydrolase family 7.

• Proceedings of the Korean Institute Of Construction Engineering and Management
• /
• autumn
• /
• pp.394-397
• /
• 2003

The Korea construction industry is now in a state where radical innovation is seriously considered. Among a variety of innovation topics, this paper focuses on innovation in public construction clients. The objective of this paper is to analyze GSA's Construction Excellence Program as a case study and to present key characteristics of the program from the perspectives of implications and lessons learned.

• Journal of Korean Society for Quality Management
• /
• v.42 no.4
• /
• pp.747-756
• /
• 2014

Purpose: The purpose of this study is to apply the Bayesian estimation methodology for producing 'Korean Standard -Quality Excellence Index' model and prove the effectiveness of the new approach based on survey data by comparing the current index with the new index produced by Bayesian estimation method. Methods: The 'Korean Standard -Quality Excellence Index' was produced through the collected survey data by Bayesian estimation method and comparing the deviation with two results for confirming the effectiveness of suggested application. Results: The statistical analysis result shows that suggested estimator, that is, empirical Bayes estimator improves the effectiveness of the index with regard to reduce the error under specific loss function, which is suggested for checking the goodness of fit. Conclusion: Considering the Bayesian techniques such as empirical Bayes estimator for producing the quality excellence index reduces the error for estimating the parameter of interest and furthermore various Bayesian perspective approaches seems to be meaningful for producing the corresponding index.

• Proceedings of the Korean Information Science Society Conference
• /
• 2006.06c
• /
• pp.307-309
• /
• 2006

유비쿼터스 컴퓨팅 패러다임이 제시된 이래로 세계적으로 유비쿼터스 컴퓨팅에 대한 연구가 활발히 진행되고있다. 그러나 아직까지 유비쿼터스 컴퓨팅은 현실세계에 적용하기에는 많은 기술적. 비기술적 장벽들이 많이 존재한다. 보안과 프라이버시에 관한 사회적인 우려는 유비쿼터스 컴퓨팅 기술의 실제 환경에 적용하는데 큰 걸림돌로 작용한다. 따라서 진행되고 있는 많은 유비쿼터스 연구들은 각각의 프로젝트에 적합한 보안 및 프라이버시 보호를 위한 기술들을 개발하여 적용하고 있는 실정이다. 유비쿼터스 시스템 연구센터는 유비쿼터스 컴퓨팅을 구현하기 위해 커뮤니티 컴퓨팅을 제안하였다. 커뮤니티 컴퓨팅에서 발생할 수 있는 보안 문제점들을 해결하기 위해 커뮤니티 스킨을 구현하였다. 커뮤니티 스킨은 커뮤니티 구성원들을 커뮤니티 외부 개체들과 구분 짓고, 외부의 침입으로부터 보호해 줄 수 있다. 커뮤니티 스킨은 암호학적 알고리즘을 적용함으로써 구현될 수 있다. 본고에서는 보안 서비스를 4가지 유형으로 분류하고 이를 토대로 커뮤니티가 보안 협약을 통한 커뮤니티 스킨을 형성 하도록 하였다.

• Research in Mathematical Education
• /
• v.7 no.4
• /
• pp.235-246
• /
• 2003

To develop the content and form of the teacher education program for mathematical excellence, we reviewed several teacher education programs. CGI is an excellent model for teacher education program for mathematical excellence. We developed the 12 teacher education programs based on mathematical tasks developed for the gifted children and have applied them to teacher education. It is not so difficult to develop more programs, because we have made a lot of tasks for the gifted in mathematics for 8 years. Wooden Die for Drinking Game which is one of 12 programs is introduced in this article.

• International Journal of Quality Innovation
• /
• v.4 no.1
• /
• pp.92-115
• /
• 2003

In this paper some of the main management control theories are reviewed and six dominating paradigms are identified. The identified management control paradigms are compared and analysed in relationship with the European Excellence Model (EEM) in order to investigate whether the EEM can be adopted as a management control model. Based on the analysis. advantages as well as disadvantages of the EEM as control model are discussed.