공사중단 방치건축물 정비 제도개선을 위한 실증연구: 충청남도를 중심으로

최정현,임준홍,Choi, Jeonghyeon,Im, Junhong 한국토지주택공사 토지주택연구원 2021 LHI journal of land, housing, and urban affairs Vol.12 No.1

우리나라는 경제성장과 위기, 사업성 부족 등 다양한 이유로 공사중단 방치건축물이 꾸준히 발생하고 있다. 공사중단 방치건축물은 다양한 형태와 규모로 분포하고 있으며 이로 인해 도시경관을 악화, 주거안정성을 저해하고, 화재 ·범죄·악취 등 다양한 도시문제를 야기하고 있다. 정부는 관련법을 제정·시행하고 있지만 시행과정에서 현실과 거리 있는 많은 문제점이 나타나고 있다. 이에, 본 연구는 충청남도 방치건축물을 대상으로 현지 실태조사, 건축관계인 및 이해관계인 심층인터뷰, 정비사업 시행자(LH), 도 및 시군 담당공무원 FGI를 통해 방치건축물 정비사업 추진의 문제점과 개선사항을 실증적으로 도출하였다. 그리고 이를 바탕으로 향후 방치건축물의 예방, 원활한 정비사업 추진을 위한 과제와 실효성 높은 제도개선사항을 제시하였다. South Korea is renowned as one of the countries which have experienced high economic growth in the past years. However since Global Financial Crisis in 2008, its economic growth has remained slow and majority cities have faced various issues in property sector such as declining property price, the increase of uncompleted building sites, abandoned land and disproportionate rate of vacant buildings. These abandoned sites in various scales and locations, particularly nearby residential areas have negative impacts on the urban environment such as crime and vandalism. To tackle these issue, in May 2013, the "Special Act on the Maintenance of Long-Term abandoned Buildings" was enacted and has been put into operation since May 2014. Subsequently, a base maintenance plan was established in 2016 by the Ministry of Land, Infrastructure and Transport. Nevertheless the plan has not been implemented properly due to the limitation of financial and human resources, lack of expertise and ambiguity of laws and guidelines. This study examines the challenges and barriers of the implementation of the Act and recommendations to resolve the urban issues are drawn. This study is a case study of Chungcheongnam-do and the main methods used are in-depth interviews and field surveys with a wide range of stakeholders including the main developer (LH), architects, surveyor and local authority officers. The findings suggest several improvement in the 'Special Act on the maintenance of long-term abandoned buildings'.

천웅(天雄)의 포제에 관하여

최정현,정병하,성만준,권동렬,Choi Jung-Hyun,Jung Byung-Ha,Seong Man-Jun,Kwon Dong-Yeul 대한한의학방제학회 2004 大韓韓醫學方劑學會誌 Vol.12 No.1

Aconiti Root(AR), has been used for about 2000 years, since recorded for low grade in 'Shinnongbonchokyung(Divine Husbandman's Herbal Foundation canon)'. It also recorded for Poisonous Drug in 'Myunguibyullok', 'Yaksungron', etc, and they advised when the AR is using for clinical desease it has to be processed. There are more than 13 processing methods, in records that related 39 parts which is recorded in ancient documents. In China, there are no standard of herb that using for clinical, cause of the traditional processing methods was cut since 1960s. In these days, they are using AR that recorded in Aconiti Tuber part of the processing records, in Guangdong and Shantung. In addition, the modification of Processed Aconiti Root(PAR) is also used for goods in Hongkong, Macao, and Southeast Asia. We studied the PAR for enhancing the importance of it, and multiply using. In this study, we search for the history of processing of AR, traditional theories of processing and clinical adaptation.

자세 교정훈련을 위한 체위 변환 감지 센서 디바이스의 개발

최정현,박준호,서재용,김수찬,Choi, Jung-Hyeon,Park, Jun-Ho,Seo, Jae-Yong,Kim, Soo-Chan 한국융합신호처리학회 2020 융합신호처리학회 논문지 (JISPS) Vol.21 No.2

최근 학생 및 사무직 종사자에게서 근골격계 질환의 발병률이 증가하고 있으며, 바른 자세의 유지 및 교정 훈련의 필요성이 요구되고 있으나, 관련 연구는 부족한 현실이다. 기존 연구에서는 의자 방석부분에 멤브레인 센서 또는 압력센서를 배치하여 무게의 편중을 보거나, 사용자를 구속하는 센서를 부착하여 체위 변환을 측정하였다. 본 연구에서는 착용편의성을 고려한 체위 변환 감지 센서 디바이스를 개발하였으며, 측정한 각도를 분석앱을 통해 확인하였다. 앉은 자세에서 체위 변환을 측정하기 위하여 경추 및 척추에 IMU 센서로 구성된 센서 디바이스를 부착한다. 두 개의 센서에서 측정되는 체위의 변화값을 각도로 변환하였으며, 각도값은 실시간으로 분석앱을 통해 보여 진다. 본 연구에서는 체위 변화에 따른 실시간 변화값의 측정 가능성과, 착용편의성, 각도 측정의 경향성을 확인해 보았다. 향후 연구에서는 보다 정밀한 각도의 연산 및 동잡음의 보정을 위한 연구를 진행해야 한다. Recently the incidence of musculoskeletal disorders in students and office workers is increasing, and the necessity of maintaining correct posture and corrective training is required, but related research is insufficient. In the previous study, a membrane sensor or a pressure sensor was placed on the seat cushion to see the deviation of the body weight, or a sensor that restrained the user was attached to measure the position change. In this study, a sensor device for detecting a position change in consideration of wearing comfort was developed, and the measured angle was verified through an analysis app. A sensor device consisting of an IMU sensor is attached to the cervical spine and vertebra spine to measure the position transformation in the sitting position. The change value of the position measured by the two sensors was converted into an angle, and the angle value is displayed in real time through the analysis app. In this study, the possibility of measuring the real-time change value according to the change in position, the convenience of wearing, and the tendency of angle measurement were proved. Future research should proceed with more precise angle calculation and correction of motion noise.

부정맥 신호의 조기진단을 위한 연속 심전도 모니터링 기기 개발

최정현,강민호,박준호,권기구,배태욱,박준모,Choi, Junghyeon,Kang, Minho,Park, Junho,Kwon, Keekoo,Bae, Taewuk,Park, Jun-Mo 한국융합신호처리학회 2021 융합신호처리학회 논문지 (JISPS) Vol.22 No.2

With the recent development of IT technology, research and interest in various bio-signal measuring devices are increasing. But studies related to ECG(electrocardiogram), which is one of the most representative bio-signals, particularly arrhythmic signal detection, are incomplete. Since arrhythmia has various causes and has a poor prognosis after onset, preventive treatment through early diagnosis is best. However, the 24-hour Holter electrocardiogram, a tool for diagnosing arrhythmia, has disadvantages in the limitation of use time, difficulty in analyzing motion artifact due to daily life, and the user's real-time alarm function in danger. In this study, an ECG and pulse monitoring device capable of continuous measurement for a long time, a real-time monitoring app, and software for analysis were developed, and the trend of the measured values was confirmed. In future studies, research on derivation of quantitative results of ECG signal measurement analysis is required, and further research on the development of an arrhythmic signal detection algorithm based on this is required. 최근 IT기술이 발달함에 따라 다양한 생체신호 측정 기기에 대한 연구 및 관심이 높아지고 있으나, 가장 대표적인 생체 신호 중 하나인 심전도, 특히 부정맥 신호 검출과 관련한 연구는 미비한 현실이다. 부정맥은 그 발병원인이 다양하며 발병이후 예후가 좋지 않으므로 조기진단을 통한 예방치료가 최선이다. 하지만 부정맥을 진단하기 위한 도구인 24시간 홀터 심전계는 사용지속시간의 제약, 일상생활로 인한 동잡음 분석의 어려움, 위험상황에서 사용자의 실시간 알람 기능에 단점을 보인다. 본 연구에서는 장시간 연속 측정이 가능한 심전도 및 맥박 모니터링 기기와 실시간 모니터링 앱, 분석용 소프트웨어를 개발하였으며, 측정한 값의 경향성을 확인하였다. 향후 연구에서는 심전도 신호 측정 분석의 정량적 결과 도출에 관한 연구가 필요하며, 이를 바탕으로 하는 부정맥 신호 검출 알고리즘 개발과 관련한 추가 연구를 진행해야 한다.

정적분 기호 이해의 특징과 교수학적 전략

최정현,Choi, Jeong-Hyun 한국수학사학회 2011 Journal for history of mathematics Vol.24 No.3

This study aims to provide a teaching strategy accommodating the symbols of the definite integral and guiding students through the meaning of notations in area and volume calculations, based on characterization as to how students comprehend the symbols used in the Riemann sum formula and the definite integral, and their interrelationship. A survey was conducted on 70 high school students regarding the historical background of integral symbols and the textbook contents designated for the definite integral. In the following analysis, the comprehension was qualified by 5 levels; students in higher levels of comprehension demonstrated closer relation to the history of integral notations. A teaching strategy was developed accordingly, which suggested more desirable student understanding on the concept of definite integral symbols in area and volume calculations. 본 연구에서는 리만합의 극한식과 정적분 기호 각각의 구성 요소의 의미와 상호 관계에 대한 학생들의 이해의 특징을 살펴보고, 이를 토대로 하여 정적분 기호 지도에 대한 교수학적 전략을 제안함으로써 학생들이 넓이, 부피를 나타내는 정적분 기호에 대한 올바른 심상을 형성할 수 있도록 하고자 한다. 이를 위하여 정적분 기호 탄생의 수학사적 배경과 교과서의 정적분 단원의 진술 내용을 살펴보았으며, 이를 토대로 고등학교 학생 70명을 대상으로 한 설문 조사를 분석하였다. 이 연구에서 학생들의 정적분 기호에 대한 이해의 층위를 5단계로 구분할 수 있었으며, 상위 단계일수록 학생들의 기호에 대한 심상이 정적분 기호 탄생의 역사와 관련 깊음을 알 수 있었다. 이러한 분석을 바탕으로 하여 정적분 기호 지도에 대한 교수학적 전략을 제안하였으며, 그 결과 학생들이 넓이, 부피를 구하는 정적분 기호들에 대한 올바른 심상을 형성할 수 있음을 알 수 있었다.

움직임 벡터의 통계적 특성을 이용한 고속 움직임 추정

최정현,박대규,이경환,이법기,김덕규,Choi, Jung-Hyun,Park, Dae-Gyue,Lee, Kyeong-Hwan,Lee, Bub-Ki,Kim, Duk-Gyoo 대한전자공학회 2000 電子工學會論文誌-SP (Signal processing) Vol.37 No.2

고속 움직임 추정 방법들에서는, 움직임 추정 오차는 최적 탐색점에서 멀어질수록 단조 증가한다는 성질을 이용하여, 계산량을 줄인다 본 논문에서는 먼저, 참조 탐색점들의 MAE (mean absolute error) 차가 클 때에, 대부분의 움직임 벡터는 작은 MAE의 참조 탐색점 방향에서 나타난다는 통계적 특성을 조사하였다 그러므로, 이 특성을 이용하여 탐색점 수를 줄일 수 있는 고속 움직임 추정 방법을 제안한다 모의 실험 결과, 기존의 고속 움직임 추정 방법들에 비해서는 비슷한 성능을 유지하면서 계산량을 줄일 수 있었다. In Fast motion estimaion algorithms, they reduce the computational complexity using the assumption that the matching error increases monotonically as the search moves away from the global minimum error In this paper, we first investigate the statistical characteristics of motion vector that the motion vector mostly occures on the side of small MAE (mean absolute error) between the reference search points when the MAE difference of them is large Therefore, we propose a fast motion estimation algorithm using this property and can reduce the number of search points The computer simulation result shows that the proposed method reduces computational complexity compared with conventional fast algorithms.

입자 필터를 이용한 월 물 수지 모형의 시간변화 매개변수 추정: 하천유량 자료의 동화

최정현,김상단,Choi, Jeonghyeon,Kim, Sangdan 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.6

Hydrological model parameters are essential for model simulation and can vary over time due to topography, climatic conditions, climate change and human activity. Consequently, the use of fixed parameters can lead to inaccurate stream flow simulations. The aim of this study is to investigate an appropriate method of estimating time-varying parameters using stream flow observations, and how the simulation efficiency changes when stream flow data are assimilated into the model. The data assimilation method can be used to automatically estimate the parameters of a hydrological model by adapting to a variety of changing environments. Stream flow observations were assimilated into a two parameter monthly water balance model using a particle filter. The simulation results using the time-varying parameters by the data assimilation method were compared with the simulation results using the fixed parameters by the SCEM method. First, we conducted synthesis experiments based on various scenarios to investigate if the particle filter method can adequately track parameters that change over time. After that, it was applied to actual watersheds and compared with the predictive performance of stream flow when using parameters that change with time and fixed parameters. The conclusions obtained through this study are as follows: (1) The predictive performance of the overall monthly stream flow time series was similar between the particle filter method and the SCEM method. (2) The monthly runoff prediction performance in the period except the rainy season was better in the simulation by the periodically changing parameters using the data assimilation method. (3) Uncertainty in the observational data of stream flow used for assimilation played an important role in the predictive performance of the particle filter.

습윤 지역의 기후-토양-식생-지하수위 상호작용을 반영한 개념적인 생태 수문 모형

최정현,김상단,Choi, Jeonghyeon,Kim, Sangdan 한국수자원학회 2021 한국수자원학회논문집 Vol.54 No.9

Vegetation processes have a significant impact on rainfall runoff processes through evapotranspiration control, but are rarely considered in the conceptual lumped hydrological model. This study evaluated the model performance of the Hapcheon Dam watershed by integrating the ecological module expressing the leaf area index data sensed remotely from the satellite into the hydrological partition module. The proposed eco-hydrological model has three main features to better represent the eco-hydrological process in humid regions. 1) The growth rate of vegetation is constrained by water shortage stress in the watershed. 2) The maximum growth of vegetation is limited by the energy of the watershed climate. 3) The interaction of vegetation and aquifers is reflected. The proposed model simultaneously simulates hydrologic components and vegetation dynamics of watershed scale. The following findings were found from the validation results using the model parameters estimated by the SCEM algorithm. 1) Estimating the parameters of the eco-hydrological model using the leaf area index and streamflow data can predict the streamflow with similar accuracy and robustness to the hydrological model without the ecological module. 2) Using the remotely sensed leaf area index without filtering as input data is not helpful in estimating streamflow. 3) The integrated eco-hydrological model can provide an excellent estimate of the seasonal variability of the leaf area index.

Sn-Pb 솔더를 이용한 경연성 인쇄 회로 기판간의 열압착 본딩

최정현,이종근,윤정원,정승부,Choi, Jung-Hyun,Lee, Jong-Gun,Yoon, Jeong-Won,Jung, Seung-Boo 한국마이크로전자및패키징학회 2010 마이크로전자 및 패키징학회지 Vol.17 No.3

본 연구에서는 Sn-Pb 솔더를 이용한 열압착법을 이용하여 경성 인쇄 회로 기판 (rigid printed circuit board, RPCB)과 연성 인쇄 회로 기판 (flexible printed circuit board, FPCB)간 접합 시의 접합 조건을 최적화하는 연구를 진행하였다. 접합의 주요 변수로는 접합 압력, 온도 및 시간이 있으며 이러한 변수의 변화로 인해 접합부의 접합 형태와 박리 강도에서 많은 차이가 발생하는 것을 확인할 수 있었다. 또한 일정 접합 온도와 시간 조건 ($225^{\circ}C$, 7초)에서 22 N/cm의 최고 박리 강도를 보이며 이후로는 더 이상 박리 강도에서 큰 차이를 보이지 않게 되는데, 이를 박리 시험 시의 F-x (forcedisplacement) curve를 토대로 파괴 에너지를 산출하여 그 차이를 규명하였다. 최적의 접합 조건은 $225^{\circ}C$, 7초로 나타났다. In this paper, we focused on the optimization of bonding conditions for the successful thermo-compression bonding of electrodes between the RPCB and FPCB with Sn-Pb solder. The peel strength was proportionally affected by the bonding conditions, such as pressure, temperature, and time. In order to figure out an optimized bonding condition, fracture energies were calculated through F-x (force-displacement) curves in the peel test. The optimum condition for the thermo-compression bonding of electrodes between the RPCB and FPCB was found to be temperature of $225^{\circ}C$ and time of 7 s, and its peel strength was 22 N/cm.

전달함수를 이용한 동흡진기 설계에 대한 연구(I)

최정현,임병덕,Choi, Joung-Hyun,Lim, Byoung-Duk 대한기계학회 2003 大韓機械學會論文集A Vol.27 No.9

The problem of reducing the level of vibrations in structures arises in various branches of technology. For the calculation of systems equipped with DVAs, the frequencies of the protected system's free vibrations are determined first. In most practical problems system have to be considered continuous systems. It is important to obtain the detailed information about not the first frequency and the mode but anothers corresponding to it. So, this paper describes the method to obtain the accurate information about the combined discrete system. This information is obtained from the combined system's receptance. This paper shows the convenience when design the dynamic vibration absorber with the combined system's receptance.