• Journal of the Korean Institute of Landscape Architecture
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• v.45 no.1
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• pp.16-27
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• 2017

The purpose of this study is to evaluate the importance of the stone cultural landscape resources is a kind of management of Jeju cultural landscape. For typical stone cultural landscape of Jeju, to target South Korea and China experts, to evaluate the importance of each resource. Using the AHP technique in the method of analysis. As a result of the importance analysis of evaluation criteria, Korean and Chinese experts evaluated the Outstanding Universal Value(ⅲ_To bear a unique or at least exceptional testimony to a cultural tradition or to a civilization which is living or which has disappeared) as the most important. and Experts from both countries evaluated the field walls as the most important landscape resource in importance of resources about each evaluation criteria and overall importance. The results of this study, it will be able to provide quantitative information in terms of landscape management of Jeju by deriving the priority of the resources from the standpoint of comparison and conservation management on the importance of local resources, which is the basis useful from the point of view of conservation and cultural heritage management about stone cultural landscape resources in Jeju. However, as South Korea and China in the comparative study, to generalize the global universal value it is seen that there is a limit, seems to limit point of this study.

• The Journal of the Korea Contents Association
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• v.20 no.1
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• pp.271-284
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• 2020

The purpose of this study is to identify the educational needs among social workers in social welfare facilities in Jeju province concerning lack of knowledge, skill and attitude, and establish the systematic education for prosecuting diverse training and suggest fundamental data for designing future curriculum. The results of analyzing top 10 educational needs for the workers are as follows: firstly technics for managing crises, understanding and practice for clients (characteristics, human right, safety and health), case management (basic), counseling technique (basic), case management (advanced), counseling technique (advanced), planning and operating social welfare program, managing client response and emotional labor, improving competence for communication (between staffs and clients, etc.), and finally assessing project outcome (project plan, execution, management and assessment, etc.). Social workers in social welfare facilities in the area have highly recognized the necessity of profession centred education. However, they had low satisfaction with the diversity of profession education in the Jeju island and the systematic training courses. This survey suggests the various results concerning qualitative growth of profession education, expansion of job-centred curriculum and security of professional instructors to fulfil systematic education training for social workers.

• Journal of KIISE:Software and Applications
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• v.30 no.1_2
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• pp.58-72
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• 2003

The objects generated by the keyword new in Java are automatically managed by the garbage collector Inside Java Virtual Machine (JVM) not like using the keywords free or delete in C or C++ programming environments. This provides a means of freedom of memory management burden to the application programmers. The garbage collector however. inherently has its own run time execution overhead. Thus it causes the performance degradation of JVM significantly. In order to mitigate the execution burden of a garbage collector, we propose a novel way of dynamic memory management scheme in Java environment. In the proposed method, the application programmers can explicitly manage the objects In a simple way, which in consequence the run-time overhead can be reduced while the garbage collector is under processing. In order to accomplish this, Java application firstly calls the APIs that arc implemented by native Jana, and then calls the subroutines depending on the JVM, which in turn support to keep the portability characteristic Java has. In this way, we can not only sustain the stability in execution environments. but also improve performance of garbage collector by simply calling the APIs. Our simulation study show that the proposed scheme improves the execution time of the garbage collector from 10.07 percent to 52.24 percent working on Mark-and-Sweep algorithm.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.3
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• pp.397-411
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• 2023

The number of deteriorated bridges with a service period of more than 30 years has been rapidly increasing in Korea. Accordingly, the importance of advanced maintenance technologies through the predictions of age-induced deterioration degree, condition, and performance of bridges is more and more noticed. The prediction method of the safety grade of bridges was proposed in this study using the classification models of the Decision Tree and the Random Forest based on machine learning. As a result of analyzing these models for the 8,850 bridges located in national roads with various evaluation indexes such as confusion matrix, balanced accuracy, recall, ROC curve, and AUC, the Random Forest largely showed better predictive performance than that of the Decision Tree. In particular, random under-sampling in the Random Forest showed higher predictive performance than that of other sampling techniques for the C and D grade bridges, with the recall of 83.4%, which need more attention to maintenance because of the significant deterioration degree. The proposed model can be usefully applied to rapidly identify the safety grade and to establish an efficient and economical maintenance plan of bridges that have not recently been inspected.

• Spatial Information Research
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• v.23 no.6
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• pp.67-75
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• 2015

Today, because human settlements are concentrated into urban area, urban planning and management technique considering the complexity, diversity, and advanced situations of urban living space is being requested. Especially, to effectively respond to large and diverse climate change driven disaster, it is necessary to develop urban planning technique including land use, infrastructure planning based on disaster vulnerability analysis. However, because current urban climate change disaster vulnerability analysis system(UC-VAS) is using census output area as spatial analysis unit, it is difficult to utilize the analysis results for specific urban planning. Instead, this study applies the grid manner to two study areas. The analysis results show that it can generate more detailed results and it can be used for detailed zoning decision by comparing with areal photos. Furthermore, by describing the limitation of the grid manner and providing professional way to secure additional scientific character and objectivity of the future urban climate change disaster vulnerability analysis system, it is expected that this study contributes to the effectiveness of system management.

• Journal of Korea Water Resources Association
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• v.39 no.9 s.170
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• pp.801-812
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• 2006

In this study, Combined Drought Index which can monitor the drought severity and intensity has been developed using PDSI, SPI and MSWSI. To verify the accuracy and applicability of combined drought index, Drought map of Korea using the combined drought index has compared with past drought event. Drought map using the combined drought index shows good accordance with past drought event and accurate quantitative drought monitoring results. Also the drought outlook technique has been developed using the weather forecast data of Korea Meteorological Administration (KMA). Drought outlook technique of this study can be used effectively as a primitive stage tool for real time drought forecast. As a result of this study, Integrated drought monitoring system has been developed which has capabilities of producing and generating the drought monitoring map and drought outlook map as well as various kinds of drought related information.

• Proceedings of the Korea Water Resources Association Conference
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• 2009.05a
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• pp.94-97
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• 2009

연 및 계절강수량의 정확한 예보는 수자원관리에 매우 중요하다. 예보 정확도를 높이기 위한 다양한 연구가 계속 진행되어 왔다. 그럼에도 불구하고 강수자료가 가지는 매우 큰 불확실성 때문에 예보의 정확도 향상은 계속되는 숙제로 우리에게 남아 있다. 이를 개선하기 위하여 본 연구에서는 군집화 기법을 이용한 연 및 계절 강수량 예측개선에 대한 연구 결과를 제시하였다. 이를 위하여 연강수량, 계절강수량 및 월강수량의 예측을 위하여 전구에서 일어나는 각종 기후 인자들과의 상관성 분석은 대단히 중요하다. 전 세계적으로 어느 특정 지역에서의 선행 기후인자 변화 양상이 우리나라의 강수량에 높은 상관성을 가지며 영향을 미친다면 예측을 위한 매우 유용한 정보라 하겠으나 국내 강수량과 기후 지수 사이의 선형 상관성은 매우 낮을 뿐만 아니라 지체상관성도 특정 지체에서 매우 큰 상관성을 보이는 인자를 찾기 어려움을 알 수 있다. 이를 극복하기 위하여 본 연구에서는 k-mean clustering을 이용하여 우리나라 주변의 기후조건을 분류하고 기후조건에 따른 강수량의 변화를 분석하였다. 남중국해역($105^{\circ}E\;^{\sim}\;135^{\circ}E$, $0^{\circ}N\;^{\sim}\;35^{\circ}N$), 우리나라 연안 해역 ($110^{\circ}E\;^{\sim}\;150^{\circ}E$, $20^{\circ}N\;^{\sim}\;40^{\circ}N$), 인도양 해역 ($75^{\circ}E\;^{\sim}\;105^{\circ}E$, $0^{\circ}N\;^{\sim}\;25^{\circ}N$) 및 아라비아 해역 ($45^{\circ}E\;^{\sim}\;75^{\circ}E$, $0^{\circ}N\;^{\sim}\;30^{\circ}N$ 평균 해수면 온도 변화에 따라 8개 군집으로 분류한 분석결과로 분석결과 2008년도는 그룹 5에 해당하며 그룹 5의 기후 상태는 근해와 남중국해역의 평균 해수면 온도가 평년보다 낮고 인도양 해역과 아라비아 해역의 평균 해수면 온도는 평년값과 비슷한 상태를 나타낸다. 그룹 5에 해당하는 기후조건에서 차년의 강수평균은 평년값 보다 적음을 보였다. 이러한 특성은 전체 유역에 걸쳐 동일하게 나타났다. 이에 대한 계절적 평균 분포는 군집 5에 대한 차년도 강수의 평균 계절분포는 전체적으로 평년값보다 낮게 나타났다. 이에 근거하여 올해 연 평균 강수량은 평년값보다 적을 것이며 전체 계절에 대하여도 평년값보다 적은 강수량이 올 것으로 판단된다. 이는 기상청의 2009년 봄철 기후전망과 유사한 예측 결과를 보여준다.

• The KIPS Transactions:PartB
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• v.11B no.6
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• pp.691-700
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• 2004

This paper proposes a user's mobility based cooperative proxy caching policy for effective resource management of continuous media objects in mobile environments. This policy is different from the existing proxy caching policies in terms of how to exploit users' mobility. In other words, existing caching policies work based on the information about objects by referring to user's requests within a specified domain whereas the proposed caching policy runs by utilizing a number of user's requests across several domains. So, the proposed policy is applicable to random requests in mobile environments Moreover, we also propose a replacement policy based on weights and playback time. To check the efficiency of the proposed caching policy, the proposed replacement policy is run with different size of caching unit object or segment. The result of performance analyze tells what a ratio of user's mobility is are major factors for the efficient operation of the cooperative caching.

• Proceedings of the Korea Water Resources Association Conference
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• 2008.05a
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• pp.189-193
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• 2008

본 연구는 충주댐 유역을 대상으로 미래의 기후변화, 그에 따른 식생상태, 그리고 미래의 토지이용 변화를 고려한 상태에서 SWAT-K 모형에 의한 수문순환인자들의 변화가 댐의 유입량에 미치는 영향을 파악하고자 한다. SWAT 모형의 검보정은 6년간($2000{\sim}2006$, 2001년 제외)의 댐유입량 자료를 이용하여 실시하였으며, Nash_Sutcliffe 모형효율은 $0.52{\sim}0.88$의 범위로 검보정되었다. 기후변화 시나리오는 IPCC에서 제공하고 있는 GCM들 중에서 CCCma CGCM2의 A2, B2 시나리오를 이용하였으며, 댐유역의 기후변화를 모의하기 위하여 과거 30년간($1977{\sim}2006$)의 기상자료 통계정보를 기준으로 Change Factor Downscaling 기법을 적용하여 2030년, 2060년, 2090년 전후의 각 30년간의 미래 정보를 재생산하였다. 미래의 식생정보는 7년($2000{\sim}2006$)간의 MODIS 위성 영상에 의한 엽면적 지수를 월단위로 구축하여 엽면적 지수와 평균기온간의 상관회귀식을 도출하여 미래 기후변화에 따른 식생의 활력도를 예측하였다. 미래의 토지이용 변화는 CA-MArkov 기법을 개선, 적용하여 총 9개의 토지이용 항목에 대하여 각 항목별 예측을 실시하였다. 2000년의 기상자료 및 댐유입량을 기준으로 이상의 미래기후, 식생, 토지이용 에측 정보를 적용하여 미래의 댐유입량을 모의한 결과를 분석하였다. 그 결과 강수량 및 온도의 변동이 가장 크게 영향을 주어 유입량의 변화가 모의되었으며, 이에 따른 수문인자의 변동은 2000년 기준으로 증발산량, 토양수분의 변동을 분석하였다. 미래의 수문순환에 가장 큰 영향을 주는 수문인자는 토양수분으로 나타나, 미래에는 산림지역 및 토지이용 개발에 따른 토양수분의 함양량 유지를 위한 유역관리가 중요한 요인이 될 것으로 나타났다.

• The KIPS Transactions:PartC
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• v.12C no.7 s.103
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• pp.999-1006
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• 2005

The Secure OS is an operating system which adds security functions to the existing operating system, in order to secure a system from sorority problems originated from inherent frailty of applications or operating systems. With the existing Secure Oses for it is difficult to set an effective security policy securing personal resources in a multi-user environment system. To solve this problem in this paper we present two Techniques to secure user data efficiently in the RBAC-based Secure OS for a multi-user environment. Firstly we utilizes object's owner information in addition to object's filename. Secondly we make use of meta symbol('$\ast$'), which is able to describe multiple access targets. In addition this paper gives some examples to show advantages from these techniques. And these features are implemented in an solaris-based Secure OS called Secusys.