• 대한지리학회지
• /
• 제48권6호
• /
• pp.856-878
• /
• 2013

도심은 도시의 성장과 발달 과정에서 가장 역동적인 변화가 일어나는 장소이다. 이 연구는 대구시 중구를 사례로 2000년과 2011년 개별공시지가 자료를 활용하여 토지이용 측면에서 대도시 도심부의 최근 변화를 분석하였다. 분석결과, 도심공동화 현상에도 불구하고 도심부의 주거기능은 여전히 상당한 수준이다. 주거용 토지이용이 크게 감소하지만 상업용 토지이용 역시 감소하고 있어 도심공동화에 따른 도심의 상업기능 약화를 볼 수 있다. 그러나 업무용 토지는 다소 증가하는 추세로 도심지향적인 업무기능의 구심적 입지가 지금까지는 그대로 유지되는 것으로 보인다. 토지이용 변화는 도심 중핵부보다 주변부에서 더 크게 진행되고 있어 중핵부가 주변부에 비해 토지이용이 안정적이라고 할 수 있지만, 용도에 따라서는 그 상황이 다르다. 주변부 도심에서는 주거용 토지의 감소가 뚜렷한 반면, 중핵부에서는 상업용 토지이용의 감소가 두드러진다. 주거용이나 주상복합용, 상업용 토지가 나지 및 기타 용도로 전환되면서 나지와 기타 용도의 토지이용이 증가하고 있어 적극적인 토지이용이 이루어지지 않는 도심쇠퇴의 한 단면을 보여준다. 업무용과 상업용이 주거용이나 주상복합용 토지이용에 비해 집중된 형태를 보이지만, 이들 용도의 토지이용에서도 2000~2011년 사이 평균중심점과 표준편차거리에 큰 변화는 없다. 이는 도심부의 토지이용 변화가 특정 지역에 한정되지 않고 도심부 전체적으로 진행되고 있음을 말해준다.

• 보건행정학회지
• /
• 제25권3호
• /
• pp.221-228
• /
• 2015

Background: This study explored the relationship between hospital resources and services uses in outpatient/inpatient-based hospital service area (HSA) in Korea. Methods: Study hospitals included all acute care hospitals except tertiary hospitals. Inpatient and outpatient hospital claims from the Korean National Health Insurance (NHI) program in 2010 were used to identify the service uses. Hospital resources and the degree of insurance premium in study areas were identified with the NHI corporation data. Study variables were computed by summing the service uses or hospital resources of study hospitals in each HSA. Service uses were represented by the total medical charges and number of visits/inpatient days. Hospital resources were measured by number of beds, number of doctors, and number of computed tomography (CT). The economic status of NHI enrollees in each HSA was controlled by the average monthly premium of NHI program per household in each HSA. The degree of using local hospitals was controlled with the localization index. Results: Analysis results showed that hospital resources such as beds, CT were statistically related to the service uses. And also localization index was found to have positive significant relationships with service uses. Conclusion: Hospital resources such as beds, CT had not only positive impacts on inpatient service uses, but also influences on the outpatient setting. Health policy makers will require monitoring and assessing the hospital resources in Korea.

• Restorative Dentistry and Endodontics
• /
• 제46권2호
• /
• pp.28.1-28.10
• /
• 2021

Objectives: This study evaluated the effect of repeated uses and autoclaving in the instrumented area, fracture resistance, and time of instrumentation of thermally treated nickel-titanium reciprocating systems. Materials and Methods: Two hundred simulated canals were instrumented using Reciproc Blue and WaveOne Gold. Each file was used up to 10 times or until fracture. The instrumented area was measured in pre- and post-operative images, using ImageJ software. Kaplan-Meier survival analysis evaluated the number of uses of instruments before fracture. Instrumented area and time of instrumentation were analyzed by Mann-Whitney U test and Kruskal-Wallis. Correlations among the number of uses and instrumented area were measured. The level of statistical significance was set at p < 0.05. Results: Reciproc Blue presented a higher estimated number of uses in comparison with WaveOne Gold (p = 0.026), but autoclaving did not affect the resistance to fracture of instruments (p > 0.05). The instrumented area was different among the evaluated groups (p = 0.039), and the instrumented area along the uses of both tested instruments was reduced. With the time of instrumentation, there was also a significant difference among the evaluated groups; the groups without sterilization cycles were faster, in comparison to those submitted to autoclaving (p = 0.010). Conclusions: Reciproc Blue was more resistant than WaveOne Gold, suffering later fracture. Additionally, the sterilization cycles did not influence the estimated number of uses of thermally treated reciprocating instruments, but the instrumented area of root canals was reduced along with the repeated uses of both instruments.

• 전자공학회논문지A
• /
• 제31A권4호
• /
• pp.1-10
• /
• 1994

In the real-time delivery of multimedia data streams over networks, the interruption of continuity in a single media stream and the mismatching of the data within the same time interval in multimedia data streams transfered in paralled on different channels are considered as the most serious synchronization problems. There are several mechanisms proposed to handle these problems. In this paper, these mechanisms are analyzed and compared in various point of view by the computer simulation. According to the simulation results, it has been shown that the method which uses the segmentation and the method which uses the seperate synchronization channel are superior to the method which uses the synchronization marks in view of the real-time transmission and quality of sevice. On the other hand, it can be seen that the method which uses the segmentation is superior to the method which uses the seperate synchronization channel from a channel utilization's point of view.

• 한국환경복원기술학회지
• /
• 제9권4호
• /
• pp.1-12
• /
• 2006

The usages of urban riverine areas for the Gapchoen and Yudungcheon in Daejoen City were evaluated by analyzing riverbed characteristics and water quality and by surveying the status of the floodplain usage including questionnaires of people visiting the rivers. Both rivers appear to be stable with insignificant bed changes as the riverbeds are dominated by gravels. Water qualities of both rivers have been improved significantly over the past decade although there are quite large seasonal fluctuations, which is common in most rivers in Korea. The results of floodplain usage analyses show that Gapcheon is dominated with static uses (>70%) such as promenades and resting facilities, while Yudungcheon by dynamic uses (>44%) such as sports facilities. Overall, both rivers require better plans for riverine area usage management considering a balance between the dynamic uses and the static uses such as natural observation places for education and habitats for birds and fish in the rivers. The questionnaire survey results indicate that overall the present status of both rivers are satisfactory and that water quality improvement is one of the key factors to enhance the value of the riverine areas. Future river restoration should be conducted by taking into account the characteristics of urban rivers in harmony with surrounding natural sceneries.

• 교육시설
• /
• 제6권2호
• /
• pp.13-23
• /
• 1999

This paper seeks to find out the policies of management and layout of middle school rooms for the community people's use. This paper surveys community's needs with respect to both the use of school rooms before, during, and after classes and preferences of use of school rooms. This paper adopts two experimental case studies to find out the models. It uses t-test analysis of the statistics to find out community people's preferences for the use of school rooms between two communities in an urban area, and uses simple and multiple regression analyses to develop models concerning community people's uses of school rooms before, during, and after classes. It also uses cluster analysis to find out the cluster among community people's preference of school rooms. It found, first, that community people's use of school rooms after class can be influenced by the uses of a play ground, a music classroom, an audio visual classroom, and a gymnasium. The use during regular classes is related to the uses of the fine arts classroom, a general classroom, a home economics classroom, a gymnasium, and a playground. The use before class is affected by the uses of a fine arts classroom, a playground, and a library. It also found that, with respect to community people's preferential use of school rooms, the rooms can be clustered as a cluster of laboratories such as a general classroom, a music room, a fine arts classroom, a science classroom, a home economics classroom, and a technique classroom, a cluster of athletic areas such as a gymnasium and a playground, and a cluster of supporting facilities such as a library, an audio visual classroom, and a computer classroom. Those clusters can also be clustered in more detail, i. e., that both a general classroom and playground can be apart from a cluster of laboratories or a cluster of supporting facilities; that an audio visual classroom can be fostered into a cluster with a home economics affairs classroom and a technique classroom. Finally this paper suggests policies of management and layout of school rooms.

• 대한교통학회지
• /
• 제28권3호
• /
• pp.19-28
• /
• 2010

국내의 자전거도로는 대체로 주변 토지이용시설 특성을 고려하지 않은 채 계획되고 있다. 이와 같이 획일화된 도로계획은 효율적이지도 못할뿐더러 안전과 이용편리에 있어서 최적의 환경을 제공할 수가 없다. 따라서 본 연구는 보다 안전하고 편리한 자전거도로 이용환경 구축을 목적으로, 자전거도로 유형에 대해 물리적 시설측면의 분류를 시도하였고, 토지이용시설 이용자의 통행특성을 조사 분석하였다. 카이제곱 독립성검정을 통해서 토지이용시설 간에 통행특성의 차이가 있음을 확인했고, 군집분석과 자전거도로 유형 결정기준을 통해 해당 토지이용시설에 적합한 자전거도로 유형을 제시하였다.

• 한국주거학회논문집
• /
• 제26권6호
• /
• pp.127-137
• /
• 2015

This investigation is to question as to whether and how much urban residential superblocks have changed the uses of facilities, as compared with original zoning plan. The difference between the original plan for 'land use' in 1960's and current 'building uses' has been examined on six superblocks in Seoul, and the reasons for change were analyzed. Investigation results are as follows: As the original urban planning was intended for use-purification by the subdivision of zones in a superblock through zoning, current buildings uses are different from the land-use. Commercial facilities are located in residential zone along community paths because of the necessity, and business buildings are placed on the appropriate-sized lots in the middle of residential blocks, due to the need of small and low-rent offices. Also, different types of residence have been built on convenient locations in commercial zone to meet various housing needs. In conclusion, the current zoning system plays a role of controling the volume of buildings rather than the use of land. Therefore, mixed use of land, not functional separation, becomes a natural phenomenon taken place in the contemporary cities, and it is high time to adopt a mixed-use zoning system.

• 한국도로학회논문집
• /
• 제17권5호
• /
• pp.93-103
• /
• 2015

PURPOSES : The purpose of this study is to present a linear programing optimization model for the design of lane-based lane-uses and signal timings for an isolated intersection. METHODS: For the optimization model, a set of constraints for lane-uses and signal settings are identified to ensure feasibility and safety of traffic flow. Three types of objective functions are introduced for optimizing lane-uses and signal operation, including 1) flow ratio minimization of a dual-ring signal control system, 2) cycle length minimization, and 3) capacity maximization. RESULTS : The three types of model were evaluated in terms of minimizing delay time. From the experimental results, the flow ratio minimization model proved to be more effective in reducing delay time than cycle length minimization and capacity maximization models and provided reasonable cycle lengths located between those of other two models. CONCLUSIONS : It was concluded that the flow ratio minimization objective function is the proper one to implement for lane-uses and signal settings optimization to reduce delay time for signalized intersections.

• 한국산업정보학회:학술대회논문집
• /
• 한국산업정보학회 2008년도 추계 공동 국제학술대회
• /
• pp.675-679
• /
• 2008

본 연구에서 웹사이트 구축시 Ajax를 사용하는 경우가 기존의 경우에 비하여 얼마만큼의 효율성을 갖는지를 비교 분석하였다. 본 연구에서의 성능비교는, 실제로 사용되는 웹사이트의 가장 적합한 환경을 비교하기 위해 ASP를 이용한 기존의 웹사이트 모델과 ASP.NET Ajax를 이용한 웹사이트를 같은 조건에서의 샘플사이트를 구축하여 비교 분석하였다. 두 사이트 모델의 각각에 데이터를 생성, 수정, 삭제, 질의 시의 응답속도 등을 비교 분석하였다. 실험을 통한 비교 분석 결과로 기존의 웹사이트 모델보다 Ajax를 이용한 모델의 응답속도가 향상된 것으로 나타났다.