아파트조경공사 설계변경의 유형분류와 특성분석

박춘수,박승범,Park, Chun-Soo,Park, Seung-Burm 한국조경학회 2009 韓國造景學會誌 Vol.37 No.1

조경공사 중 설계변경을 통하여 이루어지는 기술적 검토사안들을 토대로 설계변경의 유형분류체계를 제시하고 유형별 발생빈도와 규모, 유형간 상관성, 현장별 차이분석을 통하여 아파트단지 조경공사 설계변경의 특성을 밝히고자 하였다. 대한주택공사 충청권지역에서 2004년부터 2006년 상반기까지의 설계변경 건을 대상으로 설계변경 시 목적 및 사유로서 언급한 사안을 중심으로 유형을 구분한 결과, 단지이미지, 경관요소, 이용자 고려, 하자방지, 시공성, 현장여건, 공종간 불일치, 상위기준, 민원방지, 설계내역, 기타의 11개 유형과 47개 세부요인으로 구분하였다. 설계변경심사승인 횟수와 시기, 유형별 발생빈도와 변경규모 증감액, 상관관계를 조사 분석한 결과, 첫째, 단지이미지형 설계변경이 발생빈도 22%, 증감액 54.9%를 차지하는 주된 설계변경이었고, 둘째, 유형간 상관성 분석에서 단지이미지형 설계변경의 증가액이 커질수록 사유가 불명확한 기타 설계변경의 감소액이 커지는 반비례관계가 성립되는 등 공사비 증가를 상쇄하는 절감노력이 이루어지고 있었으며, 셋째, 설계변경심사승인 건수와 최초심사승인일은 각각 2건 이내와 준공 전 90일 이내가 $52{\sim}53%$를 차지하여 설계변경 절차가 적기에 이루어지도록 하기 위한 제도인 설계변경심사승인 자체가 사후 일괄적으로 처리되고 있었는데, 이는 공사비가 감소한 유형수와 비교결과 공사비 절감노력 즉, 예산문제에서 기인하고 있었다. In the wake of categorizing the design changes occurred during the period from 2004 till the first half of 2006 in Choongcheong province area, based on purpose and reason of design changes identified by the Korea National Housing Corp, it included 11 types such as the image of the apartment complex, scenic elements, consideration by the user, prevention of the defect, constructability, site conditions, incompatibility between the activities, superordinate standard, prevention of civic complaints, design details and others, along with 47 subordinate elements. And the evaluation intended to identify the corelation between the number and time of design change approval, frequency and scale of design change by type and the cost variations indicated that; firstly, enhancing the image of the apartment complex proved to be the main reason for design changes, accounting for 22% in terms of frequency and 54.9% in terms of cost variation. Secondly, the higher the increase in cost by design change aimed at improving the image of the complex, the lower the decrease in cost by design change for uncertain reasons, dubbed the inverse proportional relations, indicating that the design changes for uncertain reasons were mostly aimed at reducing the construction cost. Thirdly, with regard to the number of design change approval and the time of the initial approval, twice or less and 90 days or less before completion of the construction work, respectively, accounted for $52{\sim}53%$, indicating the design change deliberation and approval tended to have been carried out collectively in the form of ex post facto approval, which seemed to be attributable to the attempt of reducing the construction cost or budget problem, as a result of comparing with the cases in which the cost was reduced.

지적재조사사업에서 Network RTK 측량의 적용 정확도 분석

박춘수(Park, Chun Soo),박기헌(Park, Ki Heon),홍성언(Hong, Sung Eon) 대한공간정보학회 2013 대한공간정보학회지 Vol.21 No.4

본 연구에서는 Network RTK 측량 성과와 기존 확정성과(TS기반)에 대해 지역별 적용 정확도 분석을 통해 향후 지적재조사사업에서의 Network RTK 측량의 합리적인 적용 방안을 제시해보고자 하였다. 이를 위해 실험지역을 선정하고 총 307점에 대해 Network RTK 측량으로 성과를 취득하고 이를 확정성과와 비교한 결과 전체 연결오차의 RMSE는 ±0.1028m로 분석되었고, 총 48점이 지적재조사 허용기준(0.07m)을 초과하는 것으로 나타났다. 연구에서는 이러한 분석결과를 종합적으로 평가한 후 향후 지적재조사사업에서의 현실적인 대안을 제시해 보았다. 즉, Network RTK와 전자평판 통합형 측량 기법의 개발적용을 제안하였다. 그리고 최초 일필지 성과 취득은 토털스테이션측량으로 단일화를 하고, 검사측량에 Network RTK 측량을 적용하는 방법을 제안하였다. The purpose of this research is to suggest the reasonable method of Network RTK surveying in future cadastral re-survey project through the accuracy analysis about Network RTK surveying achievement and the conventional TS-based confirmation surveying. To achieve it, we selected the experiment places and succeeded in achieving the result by Network RTK surveying about total of 307 parcel boundary point. We compared it with the result of confirmation surveying for cadastral, and it was shown that total connection errors of RMSE was ±0.1028m and total 48 places exceeded in the cadastral re-survey allowable error tolerance. The research suggested the practical alternatives in cadastral re-survey project after the comprehensive evaluation of those analysis results. Therefore, the author suggested development and adoptation of integrated electronic plane table surveying method. Moreover, we suggested unifying the first parcel boundary point method into the total station surveying and adopt the Network RTK surveying on the cadastral surveying inspection.

지적좌표계의 세계좌표 변환 연구

박춘수(Park Chun Soo),홍성언(Hong Sung Eon),박종오(Park Jong Oh),정택승(Jeong Taek Seung),성백영(Sung Baek Young) 대한공간정보학회 2010 대한공간정보학회지 Vol.18 No.3

본 연구에서는 지적좌표체계의 세계좌표체계로의 변환 실험연구를 통하여 위치 및 면적의 변화량과 이로 파생되는 문제점들을 검토ㆍ분석하였다. 그리고 이를 기초로 개선점을 모색하여 보고자 하였다. 연구지역의 좌표변환 결과, 모든 필지경계점(총 478점)에 대한 좌표변환의 표준편차가 X=0.0079m, Y=0.0153m로 나타나 매우 양호하게 산출되었다. 면적의 차이량을 분석한 결과, 평균적으로 0.062㎡정도의 차이를 보여, 이는 현행 법률에서 규정하고 있는 면적허용오차 이내인 것으로 나타났다. 따라서 연구대상지역에 한정하여 본다면 위치나 면적부분에서 많은 차이를 보이지 않아 세계좌표계로의 전환이 가능한 것으로 나타났다. This study considers and analyzes the position and area errors and the related problems through the experimental study of the converting process from the cadastral coordinate system to the global coordinate system. Also, based on the result, the points of improvement have been considered. According to the conversion of the coordinates in the study area, the standard deviations for the conversion of coordinates in regard to every parcel boundary point (478 points in total) have been calculated as X=0.0079m and Y=0.0153m respectively. It can be considered that such values are extremely excellent. Also, after analyzing the area errors, it has been found that there is a difference of 0.062㎡ on average. Such a difference stays within the range of the allowable error tolerance specified by the current laws. Therefore, in regard to the limited area which is subject to the study, it can be concluded that the difference is not great in differences of the position or the area. As a result, the converting process into the global coordinate system is possible.

차륜-레일간 마찰계수 조절재료 기초연구

김남포(Nam Po Kim),박춘수(Chun Soo Park) 대한기계학회 2014 대한기계학회 춘추학술대회 Vol.2014 No.4-1

차세대 고속철도 최고속도 시험에서 전차선 장력 증가 단계별 집전 성능 예측 시뮬레이션

권삼영(Kwon Sam-Young),박춘수(Park Chun-Soo),안승화(An Seung-Hwa) 한국철도학회 2009 한국철도학회 세미나자료 Vol.2009 No.5

In the testing stage of HEMU-400X(next Korean high speed train) developing project, maximum speed(400 ㎞/h) tests will be conducted. On present and near future conditions of the overhead contact lines, 400㎞/h is over the design speed criteria. The predictions of current collection performance including the percentage loss of contact(arcs level) parameter through dynamic interaction simulation of HEMU-400X maximum speed test run are described in this paper. Various simulations are conducted at the condition of two different contact wire tensions to draw the proper contact wire increasing values in the 400㎞/h test line under the available contact wire tension supporting condition of that line.

차세대고속열차 추진성능 검토

한영재(Han Young Jae),박춘수(Park Chun Soo),김상수(Kim Sang Soo),김기환(Kim Ki Hwan),이태형(Lee Tae Hyung),한인수(Han In Su) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

With the increase in population, the area of human activities has expanded, resulting in the dramatic increase in the need for transportation system. Various infrastructures necessary for efficient logistics, however, have not been supplied enough and the logistics efficiency in Korea is in a bad situation now. As a result of the situation, the demand for the railroad transportation system that can provide large volume transportation has increased dramatically. An electric railway system is composed of high-tech subsystems, among which main electric equipment such as motors and converter are critical components determining the performance of electric vehicle. Among the on-board equipments, traction equipment is important part that has influence on safety and performances of vehicles. We is studied for high-speed train of foreign countries. From this research, we knows that axle weight of HEMU-400x is reasonable within 13ton.

철도차량의 현가장치로서 에너지 재생 댐퍼 이용에 대한 고찰

김상수(KIM Sang-Soo),박춘수(PARK Chun-Sooi),목진용(MOK Jin-Yong),서승일(SEO Sung-Il),이태형(LEE TAE-Hyung),김기환(Kim KI-Hwan) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-

Vibration of railway vehicle has harmful effect to dynamic performances of railway represented to stability, safety and ride comfort. Hence reduction of vibration has been discussed as an important problem and has been widely investigated. A new technology of vibration control, energy regenerative control, is introduced. Energy regenerative damper using this new vibration control converts vibration energy into other kind of energy that we can utilize. In this paper, this energy regenerative damper is applied to the dynamic absorber and vehicle suspension. And it is evaluated whether the energy regenerative railway vehicle suspension is possible.

차세대 고속철도의 최고속도 시험 계획 수립을 위한 집전 성능 예측 시뮬레이션

권삼영(Kwon Sam-Young),박춘수(Park Chun-Soo),조용현(Cho Yong-Hyeon),이기원(Lee Ki-Won),박영(Park Young) 한국철도학회 2008 한국철도학회 학술발표대회논문집 Vol.- No.-

The next Korean high speed train development project is started. In testing stage of this project, the 400㎞/h maximum speed test will be conducted. In Korean railway infrastructure conditions the 400㎞/h seems to be a critical speed especially in the aspect of the overhead contact lines. The current collection performance of the 400㎞/h which is predicted by dynamic interaction simulation are described in this paper. To discuss the permissible criteria of contact forces, displacements and percentage contact loss, the French 575㎞/h current collection conditions are simulated. Furthermore, review of the simulation results of the Korean 400㎞/h current collection conditions is conducted through comparison with that of the French 575㎞/h.

고속철도 복합운송시스템의 도입 타당성 연구

김현웅(Kim Hyun-Woong),문대섭(Moon Dae-Seop),박춘수(Park Chun-Soo) 한국철도학회 2003 한국철도학회 학술발표대회논문집 Vol.- No.-

This paper is aiming to analyse the prefeasibility study of introduction of high speed rail freight system to transport some parcels for train operation efficiencies. As it does, this system can be meant a kind of multimodal system considering the passenger and freight in the same trainset, simultaneously. First, we implemented the parcel service market survey for customers preference, predicted demand forecast for high speed rail freight, and analysed B/C, NPV, etc.. As the result, this new system is feasible of applying the passenger-freight operation system economically, find the needs such as some revision of motor car for parcel freight transportation at the initial stage.

음향방출 에너지 기반 손상 위치표정 기법을 이용한 복합재 CNG 탱크의 충격 신호 위치표정

한병희(Byeong-Hee Han),윤동진(Dong-Jin Yoon),박춘수(Chun-Soo Park),이영신(Young-Shin Lee) 한국비파괴검사학회 2016 한국비파괴검사학회지 Vol.36 No.5

음향방출기법은 구조물에 존재하는 손상 및 손상 메커니즘을 규명하는 가장 유효한 비파괴검사 수단으로 널리 이용되고 있다. 그러나 기존의 손상위치표정 기법은 탄성파 전파 속도에 크게 의존하는 기법의 한계에 의하여 복합재료 또는 이종의 재료로 구성된 구조물에서의 손상을 탐지하기 어려운 한계점을 가지고 있다. 최근 다양한 분야에서 사용되고 있는 압축천연가스(CNG) 저장용기는 무게와 강성의 효율을 위하여 복합재료를 사용하여 외부를 보강하는 새로운 형태의 구조를 사용하고 있다. 이러한 다층 복합소재의 사용으로 기존의 손상탐지기법으로는 저장용기의 외부에서 가해지는 충격 혹은 결함에 의한 저장탱크에 발생한 손상의 측정이 매우 어렵게 되었다. 이러한 한계를 극복하기 위하여 본 연구에서는 선행연구를 통하여 개발된 에너지 기반 contour D/B map 기법을 이용하여 4 가지 형식의 CNG 저장탱크에 발생한 외부 충격 신호의 손상 위치를 측정하였다. 각각의 형식의 저장탱크에서 측정된 손상 위치 결과를 비교 분석하여 새로운 기법의 측정 성능을 알아보았다. Acoustic emission (AE) is one of the most powerful techniques for detecting damages and identify damage location during operations. However, in case of the source location technique, there is some limitation in conventional AE technology, because it strongly depends on wave speed in the corresponding structures having heterogeneous composite materials. A compressed natural gas(CNG) pressure vessel is usually made of carbon fiber composite outside of vessel for the purpose of strengthening. In this type of composite material, locating impact damage sources exactly using conventional time arrival method is difficult. To overcome this limitation, this study applied the previously developed Contour D/B map technique to four types of CNG storage tanks to identify the source location of damages caused by external shock. The results of the identification of the source location for different types were compared.