RCP4.5 시나리오에 따른 IDF 곡선 분석: 우리나라 30개 저수지를 대상으로

박지훈,강문성,송인홍,황순호,송정헌,Park,Jihoon,Kang,Moon Seong,Song,Inhong,Hwang,Soon Ho,Song,Jung-Hun 한국방재학회 2013 한국방재학회논문집 Vol.13 No.6

본 연구의 목적은 우리나라 30개 저수지의 미래 IDF (Intensity-Duration-Frequency) 곡선을 산정하여 기후변화로 인한 영향을 분석하는 것이다. RCP (Representative Concentration Pathways) 시나리오를 기반으로 하는 미래 강수자료에 내재하는 계통적 오차를 분위사상법을 이용하여 보정하였고, 미래를 3기간(2025s: 2011~2040, 2055s: 2041~2070, and 2085s: 2071~2100)으로 나누어 미래 강수량의 변화를 분석하였다. 강수자료의 최적 분포형과 매개변수 추정 방법으로 Gumbel 분포와 확률가중모멘트법을 선정하였다. 한강유역, 금강유역, 영산강유역의 강우강도는 현재 1990s 기간에 비해 미래 2085s 기간에 크게 증가하였고, 낙동강유역의 강우강도는 현재 1990s 기간에 비해 미래 2025s 기간에 크게 증가하는 것으로 분석되었다. 본 연구에서 새롭게 도출한 IDF 곡선은 기후변화를 구조물 설계에 반영함으로써 농업용 저수지의 안정성을 증진시킬 수 있을 것이라 사료된다. The main objective of this study is to evaluate the impact of climate change on Intensity-Duration-Frequency (IDF) curves for the selected 30-Reservoirs in South Korea. A bias inherent in future precipitation data based on Representative Concentration Pathways (RCP) scenario was corrected by a quantile mapping method. The trends in future precipitation changes were analyzed for the three different time periods (correspond to 2025s: 2011~2040, 2055s: 2041~2070, and 2085s: 2071~2100). Gumbel distribution was selected as the probability distribution and parameters were estimated by probability weighted moment method. Rainfall intensity of Han, Geum and Yeongsan river watersheds was greatly increased in 2085s period than 1990s period. Rainfall intensity of Nakdong river watershed appeared to increase sharply in 2025s period than 1990s period. The newly developed IDF curve might enhance the stability of agricultural reservoirs through considering climate change impact into structure design process.

분위사상법을 이용한 RCP 기반 미래 극한강수량 편의보정 ; 우리나라 20개 관측소를 대상으로

박지훈,강문성,송인홍,Park, Jihoon,Kang, Moon Seong,Song, Inhong 한국농공학회 2012 한국농공학회논문집 Vol.54 No.6

The objective of this study was to correct the bias of the Representative Concentration Pathways (RCP)-based future precipitation data using a quantile mapping method. This method was adopted to correct extreme values because it was designed to adjust simulated data using probability distribution function. The Generalized Extreme Value (GEV) distribution was used to fit distribution for precipitation data obtained from the Korea Meteorological Administration (KMA). The resolutions of precipitation data was 12.5 km in space and 3-hour in time. As the results of bias correction over the past 30 years (1976~2005), the annual precipitation was increased 16.3 % overall. And the results for 90 years (divided into 2011~2040, 2041~2070, 2071~2100) were that the future annual precipitation were increased 8.8 %, 9.6 %, 11.3 % respectively. It also had stronger correction effects on high value than low value. It was concluded that a quantile mapping appeared a good method of correcting extreme value.

능동형 제진장치의 등가모델을 이용한 구조해석

박지훈,윤수용,Park, Ji-Hun,Yun, Soo-Yong 한국전산구조공학회 2012 한국전산구조공학회논문집 Vol.25 No.4

본 논문에서는 구조물과 능동형 제진장치를 상용 구조해석 프로그램상에서 해석하는데 필요한 등가모델을 제시하였으며, 이를 통해 부재수준의 구조검토가 가능하도록 하기 위한 연구를 진행하였다. 능동형 제진장치를 일반적인 구조해석모델에 반영하기 위하여 가상의 스프링과 대쉬폿을 이용한 등가링크 모델과, 별도의 축소모델 해석결과를 바탕으로 산정된 제어력을 제진장치 설치위치에 하중으로 작용시키는 등가하중 모델을 제시하였다. 수직캔틸레버 모델과 주상복합 건물 모델을 대상으로 능동형 제어기 설계를 위해 모드에 기초한 축소모델을 구축하고, 이를 토대로 산정된 제어이득으로부터 등가모델을 도출하였다. 이들 모델에 대해 얻어진 가속도 및 변위의 RMS 응답과 최대 부재력을 토대로 등가해석모델의 유효성을 검증하였다. 결과적으로 능동형 제진장치의 상용 구조해석 프로그램을 통해 제어대상 구조물의 부재력 수준까지 상세한 구조검토가 가능함을 확인하였으며, 상대적으로 등가링크 모델이 더 우수한 정확도를 나타내었다. In this paper, equivalent models for active control devices are proposed so that building structures with such devices are analyzed using commercial structural analysis programs for the assessment of the structural members under active vibration control. Equivalent link models represent active control device with a virtual linear spring and dashpot, and equivalent force models are control force history acting at the installation point in structural models. Active controllers are designed based on the reduced-order models for a vertical cantilever model and a high-rise building model and corresponding equivalent models are determined from control gain matrices. Based on acceleration, displacement and member force responses, the effectiveness of the equivalent models is verified. As a result, proposed equivalent models, of which equivalent link model showed better performance, appear to enable detailed investigation of structural behavior to the extent of member force level.

IDE 기반의 분산 페어 프로그래밍 시스템의 설계 및 구현

박지훈,이경환,Park, Ji-Hoon,Lee, Kyung-Hwan 한국정보처리학회 2004 정보처리학회논문지D Vol.11 No.6

In distributed office, the pairs can program together using a distributed pair programming system. Many CSCW tools featuring remote screen sharing function have insufficient usability, accessibility to introduce many developers to distributed pair programming. In this paper, we suggest a distributed pair programming system based on IDE, which many developers will accept and use easily. We have do#eloped a user scenario and GUI of the system, making distributed pair programming easier and designed with high extensibility by adapting design patterns and implemented in Java language. Our findings will be of significant help to developers dealing with implementation of distributed pair programming function into some commercial IDE. 물리적으로 분산된 개발자들은 분산 페어 프로그래밍 지원 시스템을 활용하여 페어 프로그래밍을 수행할 수 있다. 하지만 원격 화면 공유기능 위주의 기존 CSCW 기반의 분산 페어 프로그래밍 지원 시스템들은 많은 개발자들이 분산 페어 프로그래밍을 수용하기에는 사용의 접근성, 용이성 등의 측면에서 미흡한 점이 많다. 본 논문에서 우리는 소프트웨어 개발자들이 분산 페어 프로그래밍을 수용하기 적합한 형태의 시스템 모델로서 IDE(Integrated Development Environment) 기반의 분산 페어 프로그래밍 시스템을 제안한다. 본 시스템의 GUI와 사용자 시나리오는 분산 페어 프로그래밍이 용이하도록 개발되었으며 디자인 패턴 을 적용하여 확장성이 높도록 시스템을 설계하고 자바언어로 구현하였다. 본 연구결과는 기존의 상업용 IDE에서 분산 페어 프로그래밍 기능과 GUI를 구현하는 개발자들에게 도움이 될 것이다.

계사 및 우사 내 암모니아 및 황화수소 노출농도 평가

박지훈,석지원,이상아,권오훈,이경숙,허용,윤충식,Park, Jihoon,Seok, Jiwon,Lee, Sangah,Kwon, Ohhun,Lee, Kyungsuk,Heo, Yong,Yoon, Chungsik 한국환경보건학회 2015 한국환경보건학회지 Vol.41 No.5

Objectives: There are many hazardous agents at livestock farms. In particular, gases can be detrimental to both workers and animals. This study evaluated ammonia and hydrogen sulfide concentrations in broiler hen barns and beef cattle barns according to sampling location and height. Methods: Three broiler hen barns and three beef cattle barns were selected for gas monitoring in this study. Ammonia and hydrogen sulfide concentrations were measured using a direct-reading instrument which could measure the target gases simultaneously. Gas monitoring was conducted at human breathing height and animal breathing height at three points in each livestock farm. Results: Ammonia concentrations at the broiler hen barns ranged from 3.3 to 12.5 ppm by sampling location and height, but hydrogen sulfide was not detected. In the beef cattle barns, ammonia ranged from 3.1 to 16.3 ppm and low concentrations of hydrogen sulfide were detected at some animal breathing heights. The gas concentrations detected at each livestock farm were significantly higher in the animal breathing zones than in human breathing zones (p<0.0001). Conclusions: We found a difference in gas concentrations between human breathing zones and animal breathing zones. Gas monitoring should be conducted to improve the related environment considering both workers' and animals' health and safety.

인덕터 동향

박지훈,Park, Ji-Hun 한국전기전자재료학회 2014 전기전자재료 Vol.27 No.6

후두전적출술후 기관공재발의 위험요소 분석

박지훈,김형진,오병훈,최건,정광윤,최종욱,Park, Ji-Hoon,Kim, Hyung-Jin,Oh, Byung-Hoon,Choi, Geon,Jung, Kwang-Yoon,Choi, Jong-Ouck 대한기관식도과학회 2000 大韓氣管食道科學會誌 Vol.6 No.1

Background : Stomal recurrence that occasionally follows total laryngectomy is associated with very poor prognosis regardless of treatment modality, so it is very important to identify high risk patients to prevent stomal recurrence. Objectives : We attempted to select an optimal management method to prevent stomal recurrence by analyzing risk factors in each patient who was found to have stomal recurrence following total laryngectomy. Materials and Methods : Risk factors in each of eleven patients who had stomal recurrence out of 159 patients who underwent total laryngectomy in the last ten years were analyzed retrospectively. Data were gathered on risk factors such as the presence of subglottic extension, extralaryngeal extension, thyroid gland invasion, lymph node metastasis, timing of tracheotomy, tumor stage, postoperative radiotherapy, and inclusion of the stoma in the radiotherapy field. Results : There were eight cases of subglottic extension, six cases of extralaryngeal invasion, one case of pharyngocutaneous fistula that occurred as a postoperative complication, and one case who was taken completion laryngectomy following conservation surgery. With the exception of one case who was taken tracheotomy prior to total laryngectomy, all tracheotomies were performed intra-operatively after endotracheal intubation. There was no evidence of paratracheal lymph node or prelaryngeal lymph node metastasis on preoperative neck CT scan. There were six cases of T4 tumors, four cases of T3 tumors, and one case of T2 tumor. Salvage surgery was performed following radiotherapy in three cases, and aside from one case who was not taken post-operative radiotherapy, postoperative radiotherapy including the stoma was performed in the remaining seven cases within one month after surgery. Conclusion : Total laryngectomy with wide paratracheal lymph node dissection, thyroidectomy, and tracheotomy should be performed for patients who have high risk factors such as subglottic extension and advanced stage. We believe that tracheotomy should be precede endotracheal intubation. Efforts should be made to prevent stomal recurrence by utilizing postoperative radiotherapy and by minimizing postoperative complications such as infection and fistula.

저온 증착된 불소도핑 주석 산화 박막의 광학적·전기적 특성

박지훈,전법주,Park, Ji Hun,Jeon, Bup Ju 한국재료학회 2013 한국재료학회지 Vol.23 No.9

The electrical and optical properties of fluorine-doped tin oxide films grown on polyethylene terephthalate film with a hardness of 3 using electron cyclotron resonance plasma with linear microwave of 2.45 GHz of high ionization energy were investigated. Fluorine-doped tin oxide films with a magnetic field of 875 Gauss and the highest resistance uniformity were obtained. In particular, the magnetic field could be controlled by varying the distribution in electron cyclotron deposition positions. The films were deposited at various gas flow rates of hydrogen and carrier gas of an organometallic source. The surface morphology, electrical resistivity, transmittance, and color in the visible range of the deposited film were examined using SEM, a four-point probe instrument, and a spectrophotometer. The electromagnetic field for electron cyclotron resonance condition was uniformly formed in at a position 16 cm from the center along the Z-axis. The plasma spatial distribution of magnetic current on the roll substrate surface in the film was considerably affected by the electron cyclotron systems. The relative resistance uniformity of electrical properties was obtained in film prepared with a magnetic field in the current range of 180~200A. SEM images showing the surface morphologies of a film deposited on PET with a width of 50 cm revealed that the grains were uniformly distributed with sizes in the range of 2~7 nm. In our experimental range, the electrical resistivity of film was able to observe from $1.0{\times}10^{-2}$ to $1.0{\times}10^{-1}{\Omega}cm$ where optical transmittance at 550 nm was 87~89 %. These properties were depended on the flow rate of the gas, hydrogen and carrier gas of the organometallic source, respectively.

소프트웨어 산업체 요구사항을 반영한 자동화된 프로젝트 계획 생성 지원 기법 및 도구

박지훈,신동환,홍광의,서동원,화지민,배기곤,서영석,배두환,Park, Jihun,Shin, Donghwan,Hong, Gwangui,Seo, Dongwon,Hwa, Jimin,Bae, Gigon,Seo, Yeong-Seok,Bae, Doo-Hwan 한국정보과학회 소프트웨어공학 소사이어티 2013 소프트웨어공학회지 Vol.26 No.4

To plan a software project, the manager (1)make a work breakdown structure (WBS), (2) estimate efforts for each task, (3) assign employee to each task, and (4) estimate overall schedule. When software project becomes complicated, the possible combination of WBS, effort, and employee assignments dramatically becomes larger. Software planning tool can help software project managers to deal with this complexity. In this research, we discuss with a group of experts who work in software industry, to elicit practical requirements that should be considered in the software planning technique. Considering these requirements, we develop a software project planning tool APP (Automatic Project Planner) which provide effort estimation based on historical knowledge data and automatic human resource allocation. Our technique can be the basis of reasonable and practical software project planing. 소프트웨어 프로젝트 계획 생성 과정은 (1)프로젝트를 수행하기 위한 작업 구조(WBS)를 작성하고, (2)각 작업에 필요한 공수를 예측한 뒤, (3)작업에 인력을 할당하여, (4)전체 일정을 예측하는 과정으로 이루어진다. 프로젝트의 규모가 커질수록 가능한 작업 구조, 공수, 인력 할당의 조합의 수가 급격히 많아지며 이에 따라 프로젝트 계획 생성 과정의 복잡도가 매우 높아지게 된다. 따라서 이를 지원하기 위한 프로젝트 계획 생성 지원 기법이 필요하다. 본 연구에서는 실무 전문가 그룹과의 논의를 통해 소프트웨어 프로젝트 계획 생성 지원 기법에서 고려해야 할 여러 실무 요구사항들을 도출했다. 도출된 실무 요구사항을 고려하여 개발된 프로젝트 계획 생성 지원 도구 APP(Automatic Project Planner)는 개발 조직의 과거 지식 데이터를 활용한 공수 예측을 지원하며, 실무 이슈가 고려된 자동 인력 할당을 제공한다. 본 도구를 통해 합리적이고 현실적인 프로젝트 계획의 기반을 마련할 수 있다.

완전탄소성 감쇠기가 설치된 철근콘크리트 건물의 지진응답

박지훈,김훈희,Park, Ji-Hun,Kim, Hun-Hee 대한건축학회 2011 대한건축학회논문집 Vol.27 No.8

Empirical equation for estimating seismic response of the stiffness-degrading inelastic SDOF structures with fully elasto-plastic dampers are applied to 6- and 3-story reinforced concrete building structures with or without bearing walls. Fully elasto-plastic dampers are designed based on the nonlinear pushover analysis result for the bare frames. Nonlinear time history analysis is performed for the building models with dampers, and their ductility demands and spectral accelerations are transformed to those of SDOF structures, and compared with the response estimated using empirical equations for inelastic SDOF structures. Empirical equations estimates the ductility demands with reasonable accuracy, but the spectral accelerations have errors unacceptable for design purposes due to higher mode effects, which requires further improvement.