• Journal of the Korean Society of Marine Environment & Safety
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• v.8 no.2
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• pp.61-69
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• 2002

The relatively rapid rising trend of crime rates in marine situations leads to social concerns in Korea. This study reviews some theoretical backgrounds of the economics of crime and applies econometric models to Korean marine crimes. This research finds that there is a negative relationship between marine crime rates and unemployment rates and a positive relationship between the price level and marine crimes in Korea. The other finding results are that unemployment elasticities are higher in the 1980s and price elasticities are higher in th 1990s in comparison with the results of the other periods. This findings are incompatible with the previous theoretical researches in advanced countries. These findings show that In rapidly growing economy, marine crime occurrence is proportional to marine economic activity frequency. This result may reflect that marine crimes are different from land crimes.

• Journal of the Korean Society of Marine Environment & Safety
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• v.8 no.2
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• pp.1-8
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• 2002

Government is willing to abolish half of whole administration regulations and put emphasis to improve them. There was criticism that taper by bureaucracies' form and interest group's repulsion does not reach here upon in spite of these result. Therefore, need to ready diversified regulation adaptation administration countermeasure so that can observe because propel regulation innovation until now continuously and people, corporation, public official understand definitely contents of regulation. Contents of question regulation awareness about regulation adaptation and degree. On the basis of Question investigation about persons concerned of leisure safety law and wish to grasp observance degree, and produce synthetic Contents and field conformity degree, and draw solution plan of reformable item in leisure safety law and present development direction of leisure safety law.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2006.04a
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• pp.427-434
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• 2006

The stone pagoda on the Miruksa temple site has a high value as architectural history, because this stone pagoda is one of the oldest and grandest stone pagodas which remain in Korea today. However, this stone pagoda has remained only six stones of the northeastern part, becased this stone pagoda was collapsed at past. Therefore, it is important to know the original structure and form of this stone pagoda. Hypotheses about collapse cause of this stone pagoda are presented as four cases: collapse by earthquake, collapse by fragility of ground, collapse by durability reduction, and collapse by lightning, On the basis of these four collapse hypotheses in this study, we investigate collapse phenomenon through the structural analysis using discrete element method and evaluate collapse causes of this stone pagoda.

• River and Culture
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• v.6 no.1
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• pp.83-89
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• 2010

우리 사회는 언제부터인가 '하천복원', '강살리기'라는 말이 일상화 되었다. 하천을 복원한다는 것, 또는 강을 되살린다는 것은 무엇일까? 학술적 의미에서는 이른바 하천이라는 수생서식처가 가지는 생태계의 구조와 기능을 되살리는 것이지만, 우리 사회에서는 그런 의미보다는 강을 깨끗하고 아름답게 공원처럼 꾸며서 이른바 에메너티를 향상시킨다는 의미가 더 보편적으로 강조되었다. 문제는 이 두가지 의미는 대부분 상충된다는 것이다. 위 같은 두가지 의미가 같이 쓰이는 우리의 현실에 비추어 선진외국의 하천복원은 어느 방향으로 가고 있을까에 대한 답을 얻기위해 외국의 복원 사례를 하나의 시리즈로 엮어 독자들에게 소개하고자 한다. 이를 위해 대한토목학회, 한국생태학회, 한국하천호수학회 회원들이 공동으로 집필하고 있는 세계의 하천복원 사례를 일 년에 걸쳐 각 집필자가 돌아가면서 소개하고자 한다. 첫 사례로서 미국의 키시미 강을 이번 호에 소개한다.

• Journal of Korean Society of Industrial and Systems Engineering
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• v.23 no.58
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• pp.113-118
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• 2000

Estimation of the process deviation is an important problem in statistical process control, especially in the control chart, process capability analysis or measurement system analysis. In this paper we suggest the use of the Gini's mean difference for the estimation of the c, the measure of the process deviation through a lots of simulations in various types of distributions. The Gini's mean difference uses the differences of all possible pairs of data. This point will improve the efficiency of estimation. In various classes of distributions, the Gini's mean difference shows good performance, in sense of bias of estimates or mean squared errors.

• Journal of Environmental Impact Assessment
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• v.16 no.5
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• pp.341-350
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• 2007

Lake Youngrang is a lagoon whose effluent flows into the East Sea. Because two resort towns and two golf courses are situated at the lake basin, many tourists visit this area. Stormwater runoff surveys were carried out for the eight storm events from 2004 to 2005 in the eutrophic lake watershed to give a basic data for the diffuse pollution control of the lake. Dimensionless mass-volume curves indicating the distribution of pollutant mass vs. volume were used to analyze the first flush phenomenon. The mass-volume curves were fitted with a power function and polynomial equation curves. The regression analysis showed that the polynomial equation curves were better than the power function in representing the tendency of the first flush, and second degree polynomial equation curves indicated the strength of the first flush effectively.

• Journal of the Korean Society of Environmental Restoration Technology
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• v.10 no.5
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• pp.58-66
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• 2007

과거 빗물은 토양으로 흡수되어 정화작용을 거쳐 호수나 강으로 유입됨으로써 하천의 수질 오염을 방지할 수 있었으나 개발로 인한 도시의 불투수층 증가로 빗물은 여과없이 도시의 오염물질을 쓸어 내리며 하천으로 유입되어 하천의 수질 오염이 날로 심해지고 범람하는 빗물은 짧은 시간에 도시를 물에 잠기게 한다. 오염물질을 함유한 빗물의 정화 및 빗물 유량 조절을 위한 방안으로 미국에서는 레인 가든의 조성이 활발하게 진행되고 있다. 본 원고에서는 레인 가든의 환경적 의의와 조성방법, 그리고 빗물로부터 하천을 보호하기 위한 미국의 관련 규정을 알아보고 레인 가든의 효과에 대해 검토하고자 한다. 레인 가든은 오염 물질의 하천 유입방지 및 빗물의 저장 역할 외에 도시지역에서 최소 관리로 생물 서식처 역할을 함으로써 생태도시 조성 기술을 한 단계 높이는 방안이 될 것이다.

• Journal of Korean Society for Quality Management
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• v.34 no.1
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• pp.13-19
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• 2006

Data mining is a useful tool for analyzing data from different perspectives and for summarizing them into useful information. Recently, the data mining methods are applied to solving quality problems of the manufacturing processes. This paper discusses the problems of construction of a quality mining system, which is based on the various data mining methods. The quality mining system includes recipe optimization, significant difference test, finding critical processes, forecasting the yield. The contents and system of this paper are focused on the TFT-LCD manufacturing process. We also provide some illustrative field examples of the quality mining system.

• Journal of Korean Society on Water Environment
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• v.21 no.6
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• pp.595-601
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• 2005

In this research, effects of water circulation on phosphorus release from sediment into water body were studied. Sediments sampled at the Daechung Lake were used for the column experiments with circulation and non-circulation conditions. Deaeration coefficient, $K_1$ and reaeration coefficient, $K_2$ of non-circulation condition were 0.133 and 0, respectively, while $K_1$ and $K_2$ for circulation condition were 0.46 and 0.018, respectively. Oxidation Reduction Potential (ORP) showed a linear relationship with dissolved oxygen (DO) when DO is over 2 mg/L. Phosphorus concentration induced by phosphorus release from sediment was highly dependent upon DO, ORP, and pH. Under anaerobic condition, phosphorus release rate was higher for $Fe^{2+}$-bounded phosphorus compared to that of $Ca^{2+}$-bounded phosphorus.

• Proceedings of the Korea Concrete Institute Conference
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• 2003.05a
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• pp.223-228
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• 2003

Recently, owing to the deterioration of reconstruction and the construction, much of the construction waste is discharged in our construction field, and the amount of construction waste is rapidly increased. These waste are raised to financial and environmental problems, so the method of reusing waste concretes has been studied and carried out many direction. Especially being want of resources, if waste concrete could be recycled as aggregates for concrete, it will contribute to solve the exhaustion of natural aggregate, in terms of saving resources and protecting environment. This study is that the mechanical properties of concrete with recycled coarse aggregate were investigated for types of mineral admixture and the substitution of recycled coarse aggregate. The result of this study, in case of using mineral admixture, the property of fresh concrete was rised. And the property of harden concrete for the substitution ratio of recycled coarse aggregate was decreased. But the property of concrete with mineral admixture was better than that of concrete used only cement.