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박균서(Park Kyun Seo),손철수(Son Chol Su),윤종경(Yun Jong Kyeong),최정열(Choi Jung Youl),박용걸(Park Yong Gul) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
This paper is presented the test results to evaluate the healthiness of the ballast in subway. The test includes the dynamic load test in servicing Line the screen classification test of aggregates and the wear test. From the results, the aspect and the property of the ballast are evaluated. The dynamic load tests the relationship between the deterioration of the ballast and the fluctuation of loads. The assesexplain sment of impact factor based on the field test results in a good property of test blocks is proposed.
Comparisons of Net Heat Flux Data Sets Over the Western North Pacific
박균도,Jae-Hyoung Park,Jae-Hyoung Park,박영규,장유순 한국해양과학기술원 2020 Ocean science journal Vol.55 No.4
This study focuses on the intercomparisons of 22 net heat flux (NHF) data sets in terms of mean, linear trend, and interannual variability during 1993–2007 over the western North Pacific and its surrounding waters. The data sets can be categorized into the dominant group that shares common interannual variabilities and the outcasts that exhibit exceptional variability. Based on our analysis, we provide guidelines for users to choose reliable NHF data sets in the study regions. In addition, many NHF data sets tend to represent similar interannual variabilities in the marginal sea regions, whereas the opposite is true in open oceans where interannual variability is weak. Also, we find an evidence showing the mean biases of the NHF are mainly due to the difference in calculation of the latent heat flux. The aforementioned information will be useful for a wide community of scientists who are interested in using heat flux data.
사례분석을 통한 석축(돌쌓기옹벽)의 붕괴원인 및 안정을 위한 연구
박균서(Kyunseo Park),허성훈(Sounghun Heo),이영대(Youngdai Lee) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.6
Masonry retaining walls, which have been used since long time, have recently been widely used in the construction of small complexesas an easy-to-purchase material and eco-friendly structure. Disasters owing to the collapse of these masonry retaining walls have frequently occurred over time. The purpose of this study is to quantitatively evaluate the causes for the collapse of masonry retainingwalls by collecting and analyzing collapse data using collapse phenomenon field trips, literature review, and search tools, and to use this analysis data, to suggest measures to prevent the collapse of masonry retaining walls. As a result of collecting and analyzing collapse case data, this study found that the main causes of masonry retaining wall collapse were the loss of foundation ground (scour), ground displacement owing to the excavation of adjacent land, settlement owing to ground softening because of rainfallinfiltration, poor drainage, and inclination of stonework. The causes for collapse were of eight types, including slope sliding additionalloading, and vibration, and 16 types when literature data were included. An analysis of the collapse frequency based on the causes for collapse revealed that the two causes for collapse, foundation and drainage, accounted for approximately 60% of the total cause,and measures for stability and Governing law of critical factor were proposed using this result. 요 지오래전부터 인류와 함께한 석축(돌쌓기옹벽)은 최근에도 소규모단지 조성에 재료 구입이 쉽고 친환경인 구조물로서 많이사용되어지고 있다. 이러한 석축이 시간이 경과함에 따라 붕괴에 따른 재난이 종종발생하고 있는 실정이다. 이번 연구의목적은 붕괴현상 답사 및 문헌조사와 검색도구를 이용하여 석축붕괴자료를 수집 분석하여 석축 붕괴원인을 정량적으로평가하고, 이 분석 자료를 이용하여 석축붕괴예방을 위한 대책을 제시하는 데 있다. 붕괴 사례자료를 수집 분석한 결과이번 연구에서 석축붕괴의 주요 원인으로는 기초지반유실(세굴), 인접지 굴착 등에 의한 지반변위, 강우침투에 의한 지반연약화에 의한 침하, 배수불량, 석축의 경사, 사면활동, 추가 하중재하 및 진동 등 8가지로 나타났고 문헌자료 포함 시 16가지로 나타났다. 붕괴원인별 붕괴빈도를 분석한 결과 기초 및 배수 두 가지 붕괴원인이 전체의 약 60%를 차지하는 것으로 나타났으며,이를 이용하여 안정대책과 한계요인 지배의 법칙을 제시하였다.
최정열(Choi Jung Youl),박균서(Park Kyun Seo),류중열(Ryu Joong Youl),박정근(Park Jeong Gun),류경식(Ryu Kyoung Sik),박용걸(Park Yong Gul) 한국철도학회 2006 한국철도학회 학술발표대회논문집 Vol.- No.-
The major objective of this study is to investigate the dynamic behaviors of track due to the deterioration characteristics of ballast for servicing tracks by the field test. The durability of ballast plays an important role in the track behaviour. To estimate the deterioration characteristics of ballast, several tests have been carried out by several scholars. The deterioration characteristics of ballast is one of the most important factor in the dynamic behaviour of track and its life. In this paper abrasion/breakage characteristics of ballast is studied to predict the effect of physical ballast characteristics on ballast track. To reveal deterioration characteristics of ballast, the field test were carried out. The deterioration characteristics, studied in this paper, is applied to the dynamic behaviour of track in various conditions.
진현근,박영규,박균도,김영호,JIN, HYUNKEUN,PARK, YOUNG-GYU,PAK, GYUNDO,KIM, YOUNG HO 한국해양학회 2019 바다 Vol.24 No.2
HYCOM 재분석 자료를 이용하여 동해에서 2003년과 2014년에 장기간 지속되었던 두 개의 난수성 에디를 선정하여 각각 WE03과 WE14로 명명하고 비교 분석하였다. 두 난수성 에디가 형성되는 시기는 동한난류가 평년에 비해 북상하는 것으로 나타났으며, 이들 난수성 에디는 동한난류와 아한대전선의 상호작용을 통해 상대적으로 수심이 얕은 한국대지 해역에서 생성되었다. 겨울철 연직 혼합에 의해서 난수성 에디의 중심부는 수심 150 m까지 $13^{\circ}C$, 34.1 psu 가량의 균질한 특성을 보였다. WE03이 생성된 후 이듬해인 2004년에 대한해협 서수도를 통해 동해로 유입되는 해수의 양이 평년에 비해 많았으나 WE14가 생성된 후 이듬해인 2015년에는 대한해협 서수도를 통해 동해로 유입되는 해수의 양이 평년에 비해 많지 않았다. 이에서 대마난류가 난수성 에디에 열과 염을 공급하지만, 난수성 에디의 장기 지속에는 큰 영향을 미치지 않음을 알 수 있다. 두 난수성 에디는 울릉도 부근에서 1년 6개월 이상 유지되었는데, 두 에디의 이동경로에 있어 특별한 공통점은 보이지 않았다. 울릉분지 부근에서는 동한난류의 사행 등으로 크고 작은 에디가 계속 생성된다. 장기간 존속하는 난수성 에디는 특별한 외적 요인에 의해서 생성되는 것이 아니라, 동한난류 또는 동한난류가 사행하는 과정에서 생성된 에디와의 상호작용을 통해 생성된 것으로 보인다. 동한난류가 평년에 비해 북상했던 시기에 장기간 지속된 난수성 에디가 항상 발생하지는 않았다는 점이 위와 같은 결론을 뒷받침한다. In this study, comparative analysis is performed on the long-term persisted warm eddies that were generated in 2003 (WE03) and in 2014 (WE14) over the East Sea using the HYCOM reanalysis data. The overshooting of the East Korea Warm Current (EKWC) was appeared during the formation period of those warm eddies. The warm eddies were produced in the shallow Korea Plateau region through the interaction of the EKWC and the sub-polar front. In the interior of the both warm eddies, a homogeneous water mass of about $13^{\circ}C$ and 34.1 psu were generated over the upper 150 m depth by the winter mixing. In 2004, the next year of the generation of the WE03, the amount of the inflow through the western channel of the Korea Strait was larger, while the inflow was lesser than its climatology during 2015 corresponding to the development period of the WE14. The above results suggest that the heat and salt are supplied in the warm eddies through the Tsushima Warm Current (TWC), however the amount of the inflow through the Korea Strait has negligible impact on the long-term persistency of the warm eddies. Both of the warm eddies were maintained more than 18 months near Ulleung island, while they have no common feature on the pathways. In the vicinity of the Ulleung basin, large and small eddies are continuously created due to the meandering of the EKWC. The long-term persisted warm eddies in the Ulleung Island seem to be the results of the interaction between the pre-existed eddies located south of the sub-polar front and fresh eddies induced by the meanderings of the EKWC. The conclusion is also in line with the fact that the long-term persisted warm eddies were not always created when the overshooting of the EKWC was appeared.
도시철도 시험선 구간에서의 포장궤도 시험부설 및 성능평가
이일화(Lee Il-Wha),심재규(Shim Jae-Gyu),이춘호(Lee Choon-Ho),박균서(Park Kyun-Seo),류경식(Ryu Kyoung-Sik) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-
Recently, the development of the paved track is required as a low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The important factors of paved track are stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the prepacked concrete technique. The most important thing to design the paved track is to optimize the track structure considering various conditions. In this study, the CMP track is constructed(30m) on a test line and the track performance tested by running train to evaluation the capability and workability. The track performance are tested to confirm the vibration acceleration of the car body, wheel and track, accumulated settlement, track irregularity and crack of surface.