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LHI Journal of Land, Housing, and Urban Affairs
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Land and Housing Institute
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Volume 1, Issue 1 - Oct 2010
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Case-Based Reasoning Cost Estimation Model Using Two-Step Retrieval Method
Lee, Hyun-Soo ; Seong, Ki-Hoon ; Park, Moon-Seo ; Ji, Sae-Hyun ; Kim, Soo-Young ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 1~7
DOI : 10.5804/LHIJ.2010.1.1.001
Case-based reasoning (CBR) method can make estimators understand the estimation process more clearly. Thus, CBR is widely used as a methodology for cost estimation. In CBR, the quality of case retrieval affects the relevance of retrieved cases and hence the overall quality of the reminding capability of CBR system. Thus, it is essential to retrieve relevant past cases for establishing a robust CBR system. Case retrieval needs the following tasks to obtain appropriate case(s); indexing, search, and matching (Aamodt and Plaza 1994). However, the previous CBR researches mostly deal with matching process that has limits such as accuracy and efficiency of case retrieval. In order to address this issue, this research presents a CBR cost model for building projects that has two-step retrieval process: decision tree and nearest neighbor methods. Specifically, the proposed cost model has indexing, search and matching modules. Features in the model are divided into shape-based and scale-based attributes. Based on these, decision tree is established for facilitating the search task and nearest neighbor method was utilized for matching task. In regard to applying nearest neighbor method, attribute weights are assigned using GA optimization and similarity is calculated using the principle of distance measuring. Thereafter, the proposed CBR cost model is developed using 174 cases and validated using 12 test cases.
Development of Program Management Information Systems for Urban Renewal
Choi, Hye-Mi ; Kim, Ju-Hyung ; Lee, Sung-Bok ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 9~17
DOI : 10.5804/LHIJ.2010.1.1.009
Due to the variety of processes that are mainly influenced by the modification of law and regulations, it is difficult to propose a formal procedure of urban renewal projects. In addition, conflicts among various participants and stake-holders have made urban renewal difficult to manage. Needs for new systems to support management of this type of projects have been raised. This system should enable users to manage program aspects as well as projects given that the urban renewal consists of several projects. According to analysis of current context, the requirements of the system are classified as follows: a method to create flexible systems to cope with various process; functions to provide data on cost and schedule; user-friendly visualized tools enhancing understand of non-experts or less-experienced participants. This paper summarizes the background, requirements, concept and model of the system. Currently, prototype systems have been developed. Regarding outputs presented so far, potential benefits of the system are presented as well.
An Approach of Indoor thermal Environment Control and Energy Saving Using the PMV Index
Seong, Nam-Chul ; Yoon, Dong-Won ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 19~25
DOI : 10.5804/LHIJ.2010.1.1.019
Thermal comfort provide satisfaction of thermal environment and affects productivity of occupants in residential building. However, temperature control can not provide the thermal comfort at all the time. because thermal comfort is influenced by many environmental variables such as temperature, relative humidity, air velocity, radiation temperature, activity level and clothing insulation. The purpose of this study is that predicted mean vote(PMV) index is used as control. And, Thermal comfort is evaluated both PMV control and temperature control by simulation. Each other cases were compared, in which set-point temperatures of
and, set-point PMV index through the respective heating season in the simulation. The results show that PMV control is better to maintain comfort state and save energy than temperature control.
Development of an Evaluation Method and Support Policy for the Green Home Project
Lee, Jong-Sung ; Yoo, Jung-Hyun ; Rhim, Joo-Ho ; Kim, Hyo-Jin ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 27~34
DOI : 10.5804/LHIJ.2010.1.1.027
The energy consumption of residential sectors is given a sizable portion in total energy consumption. So, improvement of building performance can be as a part of principal energy strategy. For this reason, an evaluation tool for estimation of energy consumption was developed and supportive policies were considered in this study. In particular, energy saving technology were examined to practice the green home project, among them 7 items were selected as a factor for estimating energy consumption. In addition, to the simulation study on energy consumption, heating load, hot water demand and electric consumption was also studied with actual measured value. Further more, several supportive policies were discussed to encourage green home project in Korea.
Physical Properties of Dredged Sand Treated by Washing and Sorting Dredged Soil
Lee, Yun-Seong ; Lee, Sang-Soo ; Song, Ha-Young ; Bae, Kee-Sun ; Lee, Sung-Bok ; Lee, Do-Heun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 35~42
DOI : 10.5804/LHIJ.2010.1.1.035
Most of the dredged sand generated from the sewage pipe maintenance project and the government's four-river project are disposed depending on abandonment and filling-up. This is caused by the lack of related recycling technology using dredged sand appropriately and high absorption rate and micro-particles of dredged sand producted from existing sand production system. Thus, this study carried out a quality assessment for the dredged sand produced through the optimum washing and sorting system supplementing problems of existing dredged sand production system as a part of research to examine performance of removing micro-particles and foreign substances. As a result of the assessment, the dredged sand produced through the cleaning and sorting system showed a wide quality improvement effect in absorption rate, 0.08 mm sieve pass amount, clay lump volume and organic impurity content, and it turned out to satisfy both the quality standards of this study, KS F 2573(recycled aggregate for concrete) and KS F 2526(aggregate for concrete) so it could be confirmed that it would be able to be used as an aggregate for concrete in the future.
An Experimental Study on the Seismic Performance of RC Frames with Steel Dampers
Park, Ji-Young ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 43~50
DOI : 10.5804/LHIJ.2010.1.1.043
In this study, the influences of steel dampers on the behavior of RC frames were investigated using the experimental approach to suggest the installation methods of steel dampers using K-barces. The performances of RC frames with dampers can be evaluated by superposition the load-displacement curves of RC frames and steel dampers with regard to the influences of K-braces. Three specimens are tested to investigate the cyclic behavior of RC frames with dampers. The performances of RC frames with dampers with respect to strength, rigidity, and hysteretic performance are examined. It was found that test results demonstrates the effect of seismic retrofit on RC frames with steel dampers(D-RCF-KBSF, D-RCF-KBSP) compared with RC frames(N-RCF). An approximate design curves may not be good agreement with those of the tests, it is conservative enough so that you can design of RC frames with steel damper with regard to the influences of K-braces.
Generation of Synthetic Ground Motion in Time Domain
Kim, Hyun-Kwan ; Park, Du-Hee ; Jeong, Chang-Gyun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 51~57
DOI : 10.5804/LHIJ.2010.1.1.051
The importance of seismic design is greatly emphasized recently in Korea, resulting in an increase in the number of dynamic analysis being performed. One of the most important input parameters for the dynamic seismic analysis is input ground motion. However, it is common practice to use recorded motions from U.S. or Japan without considering the seismic environment of Korea or synthetic motions generated in the frequency domain. The recorded motions are not suitable for the seismic environment of Korea since the variation in the duration and energy with the earthquake magnitude cannot be considered. The artificial motions generated in frequency domain used to generated design response spectrum compatible ground motion has the problem of generating motions that have different frequency characteristics compared to real recordings. In this study, an algorithm that generates target response spectrum compatible ground motions in time domain is used to generate a suite of input ground motions. The generated motions are shown to preserve the non-stationary characteristics of the real ground motion and at the same, almost perfectly match the design response spectrum.
Coupled Finite Element Analysis for Semi-implicit Linear and Fully-implicit Nonlinear Scheme in Partially Saturated Porous Medium
Kim, Jae-Hong ; Regueiro, Richard A. ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 59~65
DOI : 10.5804/LHIJ.2010.1.1.059
The paper presents a comparison between a semi-implicit time integration linear finite element implementation and fully-implicit nonlinear Newton-Raphson finite element implementation of a triphasic small strain mixture formulation of an elastic partially saturated porous medium. The pore air phase pressure pa is assumed atmospheric, i.e.,
= 0, although the formulation and implementation are general to handle increase in pore air pressure as a result of loading, if needed. The solid skeleton phase is assumed linear isotropic elastic and partially saturated 'consolidation' in the presence of surface infiltration and traction is simulated. The verification of the implementation against an analytical solution for partially saturated pore water flow (no deformation) and comparison between the two implementations is presented and the important of the porosity-dependent nature of the partially saturated permeability is assessed on comparison with a commercial code for the partially saturated flow with deformation. As a result, the response of partially saturated permeability subjected to the porosity influences on the saturation of a soil, and the different behaviors of the partially saturated soil between staggered and monolithic coupled programs is worth of attention because the negative pore water pressure in the partially saturated soil depends on the difference.
Assessment of Optimum Reinforcement of Rebar for Joint of PHC Pile and Foundation Plate
Park, Jong-Bae ; Sim, Young-Jong ; Chun, Young-Soo ; Park, Seong-Sik ; Park, Yong-Boo ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 67~73
DOI : 10.5804/LHIJ.2010.1.1.067
Method of protruding steel bar embedded in PHC pile for connecting with foundation plate is an intermediate form of fixed and hinged connection and has often been used in architectural structures such as apartment complex. However, mechanical properties of this method have not been proved and its construction process is not simple. In this study, therefore, by analyzing previous research and by considering ratio of steel bar and concrete in PHC pile, which is minimum reinforcement of rebar, the newly optimized method of reinforcing joint of PHC pile and foundation plate is suggested with respect to PHC pile type (PHC 450, PHC 500, and PHC 600). To assess mechanical properties (ultimate tensile and shear strength) of joint of PHC pile and foundation plate, full scale experimental tests are performed. As a result, all cases are satisfied with required design criteria and can be practically applied. Our results indicate that reduction of rebar reinforcement compared to previous method would lead cost saving in PHC pile construction.
A Study on a Reasonable Choice of Simulation Model for Rainfall-Runoff in the Prior Review System on Disaster Effect
Lee, Jung-Min ; Yun, Jeong-Ran ; Kim, Young-Jin ; Jin, Kyu-Nam ; Han, Hyung-Geun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 75~82
DOI : 10.5804/LHIJ.2010.1.1.075
Urban development is a cause of expansion of impervious area. A permanent storage is operated as a method of reducing runoff of watershed. The purpose of study is to propose reasonable choice of simulation model for rainfall-runoff in the prior review system on disaster effect. First, we indicated problem about concentration time choice in the flood simulation. To test the adequacy of a rainfall-runoff simulation model, We analyzed characteristics of rainfall-runoff about urban and natural watersheds. A simulation model was calibrated with the storm of july 7 to July 9 in 2009. From the result, we proposed that SWMM and kinematic wave method as the flood simulation models for urban and natural watersheds. A simulation model and design method of a permanent storage for flood that is proposed in this study will be useful for practical design of flood simulation. The hydrologic analysis method of the study can be used for capacity evaluation of permanent storage plan.
A Study on Improvement of Less Prosperous Index by Development Promotion Zone Projects
Lee, Hyeon-Joo ; Ahn, Jae-Seong ; Kim, Mi-Suk ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 83~90
DOI : 10.5804/LHIJ.2010.1.1.083
The purpose of the study is to investigate the degree of improvement in less prosperous index as a result of development promotion zone projects, one of the most representative projects to develop the less prosperous regions in Korea since 1994. Comparing two less prosperous indices between 1995 and 2008, we performed cluster analysis using change values of ranks. Then, we analysed spatial pattern of clusters. The result showed that the extent of improvement of the less prosperous index was higher in Jeollan-do and Chungcheong-do, and slightly lower in Gangwon-do and northern part of Gyeongsanbuk-do.
Utilizing an Office Building of Public Institution for Activating the Communities of Innovation City - Focused on the Facility Type and Scale
Jeong, Yeun-Woo ; Lee, Sang-Jun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 91~102
DOI : 10.5804/LHIJ.2010.1.1.091
The purpose of this study is to prepare the introduction of the community facilities in public corporation buildings as the effort to community activation in the innovation city. The type and development condition of community facilities, and the cases of the private and public corporation buildings are studied. Moreover, the type and scale of facilities which can be established in the public corporation building that will move to the innovation city. The result can be summarized as follows; First, the community facilities can be classified into leisure, public administration, culture, athletics, and welfare, and the facilities are suggested at each hierarchy of living area. Secondly, the result of the case study shows that the public corporation establishes and operates various facilities include welfare, culture, and athletic facilities while the private part usually installs the cultural one. Thirdly, cultural(library, museum, performing place), athletic(soccer field, tennis court, swimming pool), welfare(day nursery, children's library) facilities are selected as the applicable ones to the public corporation building which is going to move to the innovation city. And finally, the basic unit of each facility is derived based on the investigation of legal standard, present condition, and literature reviews, etc., and applied to estimate the scale of the community facility in the public corporation building.
Issues on a Large-scale Enlargement of Urban Area and their Implications for a Management Plan
Yoon, Jeong-Joong ; Kim, Ryoon-Hee ; Choi, Sang-Hee ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 103~111
DOI : 10.5804/LHIJ.2010.1.1.103
The purpose of the paper is to research issues and implications on a large-scale enlargement of urban area in city management plan. This study investigated laws and regulations in force and carried out case study for three cities such as Yangju-si, Gimpo-si, Whaseong-si. As a result of analysis, three points at issue were abstracted and improvement ideas for each of them were suggested as follows. First, to set up adequate size of urban area, it is necessary to consider resonable planning for population, spatial structure, zone of life and land use in city comprehensive plan and city management plan. Second, to decrease arguments about scope and bounds of urban area, it is important to make general and specific guidelines to set up them. Third, to manage new urban area and its surroundings efficiently, it is necessary to subdivide zoning of non-urban area strictly, to restraint individual location of factories or cattle sheds, to make a proper infrastructure plan in advance, to administer strongly the permission of development behavior and to control strictly consecutive and joining development in non-urban area.
Analysis of New Transit System Effect in Large Scale Land Development Projects
Kim, Tae-Gyun ; Chang, In-Seok ; Lee, Young-Hoon ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 113~124
DOI : 10.5804/LHIJ.2010.1.1.113
This study is evaluating that new hi-tech transit systems each type of function and introduce applicable guideline decreases land sale price in New town and Large scale land development projects. For this, use the look-up table through the composite category of each type of system at the functional types, local characteristics. It also, As introduce the new systems calculate the Social benefits such as altered public traffic transfer system, reduced transit time and reduced carbon emission considering the three-dimensional arterial roads. As a result, New transportation systems contribute that the more reducing traffic congestion and air pollution and municipalities seeks for environment-friendly policy. However, this paper emphasize that the new transportation system has been introduce without considering the characteristics of locality and the efficient arrangement of them, it cannot be transferred the to the existing public traffic efficiently, futhermore causes the sale price in new large scale land development projects.
A Study on the Influence of Factors of Corporate Culture for the Organizational Effectiveness in Merger Enterprise
Park, Kun-Suk ; Kim, Jong-Lim ; Nam, Ki-Eun ;
LHI Journal of Land, Housing, and Urban Affairs , volume 1, issue 1, 2010, Pages 125~134
DOI : 10.5804/LHIJ.2010.1.1.125
Integrating corporate culture in a merger enterprise is considered as one of the most important variables to decide M&A success. This study established a conceptional model according to the preceding study on integrating corporate culture and organizational effectiveness, and formulated a hypothesis on the interrelation between a seven factors of corporate culture proposed by Pascale & Athos and Peters & Waterman and organizational effectiveness. The result of applying multi-regression analysis to test the hypothesis is as follows; firstly, all of a merger enterprise's cultural factors have meaningful influence on job involvement among organizational effectiveness; secondly, all of them have sincere influence on job satisfaction among organizational effectiveness except shared value; and thirdly, all of them except skill have significant influence on organizational harmony among organizational effectiveness. This is a significant empirical and exploratory study to ascertain the variables of corporate culture factors, and to verify their effects on organizational effectiveness.