• Proceedings of the Korea Concrete Institute Conference
• /
• 1999.10a
• /
• pp.377-380
• /
• 1999

This paper dscribes an experimental investigation into the cause of flexural-shear failure in RC beams. The experimental variables are bottom flange width and tension bar location. Then these test results were compared and analyzed to deduce the major cause of critical-shear cracking. As a result, it was found that the propagation of the critical shear crack depended exclusively on the intensity of horizontal cracking.

• Journal of the Korean Society of Safety
• /
• v.24 no.2
• /
• pp.13-16
• /
• 2009

A ski lifter for winter sports is one of the necessary and familiar facilities. But recently safety concern about ski lifter has been built. The ski lifter crash in Pocheon happened recently showed an example of safety concern and frigidity for safety awareness. In this report, the cause of the ski lifter crash in Pocheon was reviewed, and some suggestions were made to prevent a similar accident base on this review.

• Journal of the Korean Society of Safety
• /
• v.16 no.3
• /
• pp.31-34
• /
• 2001

Cause of Bucheon LPG refueling station accident could not be clearly verified because of opposite talking of men reponsible for the accident the accident, damaged by BLEVE and fire, and no systematic fire investigation. After two and half years, recently first judgement has been carried out. But competitive arguement is going on and first leak point of massive LPG will not be clearly identified with evidences acquired by now. This accident gave us many instructions and advices. Specially, massive LPG leak can result in pool fire and safety of underground-installed storage tank is proved by no damage in the strong BLEVE.

• 열병합발전
• /
• s.30
• /
• pp.21-25
• /
• 2002

According to recent Korea Electric Power Company report, yearly distribution line brass cramp bolts failure summed up to 4,400 cases emerging as one of main local break-down causes. Naturally, the need for the investigation was proposed To determine the root cause of the cramp bolt failures, mechanical and metallurgical investigation were performed for 90 samples which collected from various sites. For the understanding of the geometric characteristics, stress distribution was evaluated by CAE program and proof load of each bolts was tested. The SEM&EDS was used for metallurgical investigation. Through the investigation, the root causes of failures were confirmed. All damaged bolts showed intergrannular fracture mode and the all fractured bolt showed ß phase morphology contrast to the a&ß mixture morphology of the non-damaged samples. Additionally, EDS analysis confirmed the existence of lead rich layer on grain boundaries.

• Journal of the Korean Society of Safety
• /
• v.26 no.4
• /
• pp.27-33
• /
• 2011

Forensic Engineering is the area covering the investigation of products, structures that fail to perform or do not function as intended, causing personal injury or damage to property. To investigate explosion accident of the centrifugal casting machine in terms of the forensic engineering, in this paper, the computing simulation using ADINA FSI has performed to investigate that the effect of the Check-Pin fracture by the flow phenomena and molten metal weight and the mechanical properties test of the accident Check-Pin has performed using the instrumented indentation technique. Through these studies, the safety accident that may occur in centrifugal casting machine can be minimized by performing specialized and systematic investigation of the accident cause in terms of the forensic engineering.

• Journal of the Korean Society of Safety
• /
• v.23 no.5
• /
• pp.15-21
• /
• 2008

The bus using compressed natural gas(CNG) trend to be extended in use internationally as optimal counter-plan for reducing discharge gas of light oil due to high concern about environment. But, Composit pressure vessels(CPV) to be equipped with CNG bus is always involved in the point that safety accidents happen due to having compressed natural gas. In this report, we analysis the cause of CPV bursting accident by reviewing design and manufacture factor and suggest preventive measure through this case.

• Journal of Information Science Theory and Practice
• /
• v.11 no.4
• /
• pp.14-39
• /
• 2023

Cybercrime is a significant threat to Internet users, involving crimes committed using computers or computer networks. The landscape of cyberspace presents a complex terrain, making the task of tracing the origins of sensitive data a formidable and often elusive endeavor. However, tracing the source of sensitive data in online cyberspace is critically challenging, and detecting cyber-criminals on the other hand remains a time-consuming process, especially in social networks. Cyber-criminals target individuals for financial gain or to cause harm to their assets, resulting in the loss or theft of millions of user data over the past few decades. Forensic professionals play a vital role in conducting successful investigations and acquiring legally acceptable evidence admissible in court proceedings using modern techniques. This study aims to provide an overview of forensic investigation methods for extracting digital evidence from computer systems and mobile devices to combat persistent cybercrime. It also discusses current cybercrime issues and mitigation procedures.

• Journal of the Korean Institute of Gas
• /
• v.15 no.6
• /
• pp.51-56
• /
• 2011

Mixed gas cylinder(80% Ar, 20% $O_2$) exploded three years ago. But the cause of cylinder rupture was not identified and the case was finished. This paper is the discussions on the cause of cylinder explosion with the investigation report by the police and the similar accident cases. The cause of explosion is the chemical reaction in the cylinder. This accident is similar with the explosion of pressurized oxygen cylinder.

• Asian Pacific Journal of Cancer Prevention
• /
• v.17 no.5
• /
• pp.2643-2648
• /
• 2016

Background: High-sensitivity C-reactive protein (hsCRP) levels are lower in Japanese compared with Western subjects. Since it is uncertain whether hsCRP is a potent predictor of mortality at low CRP concentrations, the present study examined associations with all-cause and cause-specific mortality in a large population of Japanese. Materials and Methods: Subjects were 4,737 men and 6,343 women aged 49-76 years participating in the baseline survey of an ongoing cohort study of lifestyle-related diseases between February 2004 and July 2006. Hazard ratios for all-cause and cause-specific mortality associated with hsCRP levels were estimated using Cox proportional hazards regression. Results: A total of 436 all-cause deaths occurred during a median follow-up of 8 years. The main cause of death was cancer. In men, hsCRP levels were positively associated with the risk of all-cause mortality as well as deaths from cancer and cardiovascular disease (CVD). All-cause mortality hazards for the 2nd (0.34-0.84 mg/L) and the 3rd (${\geq}0.85mg/L$) tertiles of hsCRP were 1.27 (95% confidence interval [CI], 0.93-1.73) and 1.75 (1.30-2.37), respectively (p for trend=0.001). In women, increased risk of all-cause and cause-specific mortality associated with elevated hsCRP levels was observed, but the associations were not statistically significant. Conclusions: HsCRP may be an independent predictor of all-cause, cancer and CVD mortality in apparently healthy Japanese men, but not women. The differential effect of hsCRP in predicting mortality risk by sex warrants further investigation.

• Fire Science and Engineering
• /
• v.24 no.6
• /
• pp.112-119
• /
• 2010

In this research paper, the analysis, and improvement, of conditions of fire investigation related to products were derived. The results of the research showed that the main entity that plays the role of coordinator on the scene of fire investigation is unclear, systematic devices to protect the rights and interests of fire victims are inadequate, there are limitations in deriving the cause of fire due to the lack of fire appraisal organizations in fire departments, and the product companies are passive in their initial actions. As for improvement measures, it was found that the adoption of the system in which fire departments can play the role of mediator on the scene of fire investigation, the establishment and operation of fire appraisal organizations and research institutes in fire departments, and the establishment of network between fire departments and product companies are needed.