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어선 점용면적 기초 연구를 위한 부산항 중·소형 어선의 통항 이격거리 조사 및 분석
박현구,김현동,박영수,김대원,박상원,Park, Hyungoo,Kim, Hyundong,Park, Young-soo,Kim, Dae-won,Park, Sangwon 해양환경안전학회 2021 해양환경안전학회지 Vol.27 No.6
4차 산업혁명시대에 해운산업에서는 자율운항 선박의 출현이 예상되고 있다. 이와 관련된 충돌회피 시스템 연구는 활발하지만 대부분 상선을 중심으로 추진되고 있다. 자율운항 선박이 조우하게 될 모든 선박을 고려하였을 때 어선과의 충돌회피 시스템 연구 또한 반드시 필요하다. 본 연구에서는 어선의 점용면적(Ship's domain) 반영한 충돌회피 모델의 연구를 위하여 부산항과 인근 해역의 중·소형 어선과 모든 선박과의 통항 이격거리를 조사하였다. 통항량이 가장 많은 기간의 AIS 데이터 중에서 조우관계에 있는 어선과 모든 선박간 상대위치를 원형산포도로 나타내었고, 이를 대상선박으로부터 방위별 평균 이격거리 및 최다 통항 이격거리로 분석하였다. 분석 결과, 어선의 속력이 증가할수록 평균 이격거리는 방위별 4L에서 8L 정도로 증가하였고, 선박 길이가 증가할수록 10L 이상이던 평균 이격거리가 약 6L 정도로 감소하는 경향이 나타났다. 추후 어선의 점용면적 일반화를 통한 충돌회피 모델에 연구에 본 기초결과가 활용될 수 있을 것으로 기대된다. In the era of the fourth industrial revolution, Maritime Autonomous Surface Ship(MASS) are expected to emerge in the shipping industry. There has been much active research on collision avoidance systems regarding MASSs, but most of it has focused on merchant ships. A study of collision avoidance systems in fishing vessels is also essential, because Maritime Autonomous Surface Ships will encounter all type of vessels. In this study, the minimum passage distance between small-medium-sized fishing vessels and other vessels was investigated for the Ship's domain analysis. Based on the AIS data of Busan port and the adjacent area, the separation distances of fishing vessels were analyzed. The results indicated that as the speed of fishing vessels increased, the distance increased from 4L to 8L, and as length of the fishing vessels increased, the distance decreased from 10L to 6L. It is believed that the results of this study can be applied in the future to collision avoidance models for MASSs that reflect the domain of fishing vessels.
국민임대주택 주거환경 개선을 위한 친환경사업의 타당성 분석 - 광주광역시를 대상으로 -
박현구,이현철,Park, Hyeon-Ku,Lee, Hyun-Chul 한국주거학회 2009 한국주거학회 논문집 Vol.20 No.5
In case of national rental apartment, habitability is generally evaluated low comparing with typical apartments. So, researches and investment are required to increase the residential environment. In this point of view, present study aims to suggest the basic data for improvement of homeless masses' dwelling level through economic feasibility analysis. Firstly national rental apartment, which habitability is considered to be low in the point of environment-friendly, welfare, and convenience, is chosen as objective. Secondly environment-friendly project items including project flow were set up, and then basic model was formed to evaluate economic feasibility through priority survey to residents. In result, priority for two items among six different proposals were higher than the others. This result could be useful when trying to increase the dwelling level of national rental apartment being planned to construct in future.
박현구,강민구,김승우,Park, Hyun-Goo,Kang, Min-Gu,Kim, Seung-Woo 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.6
In this paper, a new positioning method with incoherence of white light is described and practically implemented to attach VCR heads on a drum very accurately. This method utilizes the Michelson Interferometer which uses white light with short coherence length as the light source to generate interference fringes only in case the optical path difference is shorter than about 2.mu.m. The course position of VCR heads and the fine are determined by appearance and visibility of interference fringes, respectively. The appearance are detected by an image processing technique using FFT(Fast Fourier Transform).
박현구,송혁,고성석,Park, Hyeon-Ku,Song, Hyuk,Go, Seong-Seok 한국주거학회 2007 한국주거학회 논문집 Vol.18 No.1
At the economical crisis of Korea in 1997, self-determined price for apartment and the revision increasing the ratio of residential area for mixed-use residential building were introduced to activate the construction industry, which causes construction companies to build super high rise apartment discriminative and high class orientated. This study aims to classify the super high rise building which is planned to build or built recently and to analyze the architectural characteristics. The objects are 288 unit households in 26 apartment complexes higher than twenty five story since 1998. As a result, super high rise building comparing with existing apartments were being varied in plan types of main building and unit household and in construction types. As for the plan, the number of walls having opening to outdoor were increased and it is considered that high rise building can take advantage of a view, lighting and sunshine. The location of living room that used to be in the center of unit in existing apartment was moved freely without rule.
화강풍화대를 통과하는 슬러리 TBM의 체적손실 산정에 대한 사례 연구
박현구,오주영,장석부,이승복,Park, Hyunku,Oh, Ju-Young,Chang, Seokbue,Lee, Seungbok 한국터널지하공간학회 2016 한국터널지하공간학회논문집 Vol.18 No.1
본 논문에서는 화강풍화대를 통과하는 슬러리 TBM 굴진 중 지표 침하 및 체적손실 산정에 관한 사례 연구를 수행하였다. 터널 천단 침하 계측 결과로부터 TBM 굴진 단계별 침하 발생 경향을 분석하였고, 횡방향 지표 침하 트라프로부터 굴진 중 체적손실 및 트라프 변수를 산정하였다. 또한, 체적손실 산정 모델을 이용하여 지반 특성과 굴진 중 측정된 기계데이터가 반영된 굴진 단계별 체적손실을 산정하였으며, 이를 실제 계측 결과와 비교 분석하였다. 슬러리 TBM의 경우 대부분의 지표침하는 쉴드 본체 통과 및 뒤채움 주입 이후 발생하는 것으로 나타났고 문헌에 보고된 총 체적손실 및 트라프 곡선 형태가 확인되었다. 실제 굴진 중 체적손실은 굴진 단계별로 쉴드손실 예측값의 90%, 테일부 손실 예측값의 60% 수준으로 분석되었고, 쉴드 손실에 비해 테일부 손실의 편차가 큰 것으로 나타났다. This paper presents a case study on the ground settlement and volume loss estimation for slurry pressure balanced shield TBM tunnelling in weathered zone of granite rock. Settlement at each stage of shield tunnelling was analyzed and the volume losses and settlement trough factors were estimated from observations. In addition, using the existing volume loss evaluation method in literature, volume losses were estimated considering ground properties and actual driving parameters. Most of ground settlement occurred during passage of shield skin passage and after backfill grouting, and the measured total volume loss and trough curves appeared to coincide with literature. Shield and tail loss obtained from field measurement were found to be around 90% and 60% of the predictions, where tail loss indicated larger deviation than shield loss.
경기도 북부지역 아파트의 지하주차장 실내공기질 변동 특성
박현구(Hyun-Ku Park),정연훈(Yeon-Hoon Jung),김병록( Byeong-Lok Kim),김진길(Jin-gil Kim),신형순(Hyung-Soon Shin),이상수(Sang-Soo Lee),오조교(Jo-Kyo Oh) 한국환경보건학회 2018 한국환경보건학회지 Vol.44 No.3
Objectives: The study examined indoor air quality during daytime and commute times in underground parking lots in five apartments located in northern Gyeonggi province. Methods: This study examined the temporal characteristics of PM 10 , CO 2 , CO, HCHO and VOCs in the indoor air quality of the underground parking lots in five apartments. concentration in daytime were ranged from 37.4 to 69.9 µg/m 3 which complied with the indoor air quality maintenance standard (200 µg/m 3 ) and Gyeonggi province ordinance standard (180 µg/m 3 ). However PM 10 concentrations in commuting time were in range of 447.3~944.0 µg/m 3 that exceeded for both criteria. The CO 2 , CO and HCHO concentrations complied with the standard. The VOCs indicated high tendency in the order of toluene, xylene, ethylbenzene and benzene. This tendency was more apparent in commuting time than daytime. Conclusion: All indoor parking lots of five apartments were equipped with ventilators. However the most apartment residents did not operate blowers to save electricity and the lack of interest for indoor air quality. In order to improve the indoor air quality of underground parking lots in apartment, operating ventilation system during commuting time is recommended.