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울산신항 남항 2단계 사업으로 인한 진하해수욕장의 표사이동특성 변화
장성열(Chang, Sung Yeol),박원경(Park, Won Kyung),조상민(Cho, Sang Min) 한국연안방재학회 2014 한국연안방재학회 학술발표대회 논문집 Vol.2014 No.-
진하해수욕 장의 해안침식과 회야강 하구 퇴적 현상을 규명하기 위한 다양한 모니터링, 현장실험, 수리모 형실험 및 수치해석 연구가 진행되어 왔다. 본 연구에서는 진하해수욕장의 파랑모델(SWAN)과 파랑-흐름 동 시계산이 가능한 SWASH모델을 이용하여 진하해수욕장의 파랑 및 흐름특성을 파악하였으며 울산신항 남항 2단계 사업시행으로 인한 진하해 수욕장에 미치는 영향을 검토하였다. 검토결과 울산신항 남항 2단계 사업완료후 진하해수욕장 전면해안의 내습파랑 감소로 인한 흐름 감소가 나타났으며, 특히 명선도 북측해안에서의 흐름저감이 두드러지게 나타나 현재의 표사이동경향의 변화가 발생할 것으로 예측된다.
장성열(Sung Yeol Chang),문용호(Yong Ho Moon),박원경(Won Kyung Park) 한국연안방재학회 2017 한국연안방재학회지 Vol.4 No.1
Most of the short period waves are blocked by the breakwaters when the short period irregular waves propagate into the ports. However, nonlinear irregular wave numerical experiments show that the long waves generated by the nonlinear interaction is predominant in the port. Seiches phenomenon in Geumjin Fishing Port is very similar to 60 and 300 second harbor oscillations. By arranging the inner breakwater of the proper length in the inside of the port, it is possible to effectively reduce seiches, as well as the short-period wave, and significantly improve the harbor tranquility. In the case of rectangular basin type such as the Geumjin Fishing Port, the multi-directional irregular wave numerical model should be used for the investigation and countermeasures for the harbor tranquility.
600MPa급(SM 570 TMC) 고성능강 기둥-보 용접접합부의 탄소성 거동에 관한 연구
김종락,오영석,백기열,장성연,Kim, Jong Rak,Oh, Young Suk,Baek, Ki Youl,Chang, Sung Yun 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.6
최근 초고층 건축물의 수요에 대응하여 고성능 고강도 강재에 대한 수요가 급증하고 있으며 고층건축물에 대한 지진 피해에 대한 인식이 확산되면서 건축구조용강에 대한 요구 성능이 점차 증가하는 추세이다. 이러한 수요에 의해 600MPa 급 강재가 출현 되었으며 현재 강교량 및 초고층 건축물에 적용하려고 많은 연구가 이루어지고 있다. 새로운 강재를 적용한 골조의 수평력에 대한 거동은 자료가 부족한 실정이다. 특히 인성에 관해서는 일반구조용 강재를 적용한 기둥 보 접합부의 소성변형율과 비교하여 고강도강을 적용한 기둥보 접합부의 소성변형율 관련 설계자료가 절실히 필요하다. 따라서 본 연구에서는 600MPa급(SM570 TMC) 강재를 적용한 기둥-보 접합부의 초기연구로서 논스캘럽과 추천형스 캘럽 상세의 실구조물 규모의 기둥-보 용접접합부 실험체를 제작, 내진성능실험을 통해 구조성능을 평가하였다. 기존의 일반구조용 SM490 강재를 적용한 기존의 연구와 비교 분석하여 초고층 건축물에 적용을 위한 내진설계자료 및 제작상의 주의사항을 제시하였다. While the recent high demand for mega-tall buildings has led to the development of high-performance and high-strength steels, the requirements for architectural-structure-performance steel have been raised as engineers recognize the potential damage that an earthquake can wreak on a tall building. A 600MPa-class steel has emerged to meet such need, and many studies are currently exploring its practical applications on civil engineering works and mega-tall buildings. The available data on the horizontal-force behaviors of structures built with such new steel, however, are still insufficient. There is an urgent need to look into its design data, especially its toughness, and to compare the plastic strain ratios of column-to-beam connections using high-strength steel and regular steel. One of the first studies on the behavior of a column-to-beam connection using 600MPa-class steel (SM570 TMC), this thesis analyzes such steel's structural performance by conducting a structural test on seismic resistance on a full-scale column-to-beam welded connection with non-scallop and recommended-scallop details. Compared with the previous studies on SM490, this thesis evaluates the weldability of SM570 TMC and presents the latter's seismic design data for use in testing its practical application.
600㎫급 고성능강의 十자 기둥-보 접합부의 탄소성 거동에 관한 실험적 연구
강재석(Kang Jae-Seok),백기열(Baek Ki-Youl),장성연(Chang Sung-Yun),이은택(Lee Eun-Taik),김종락(Kim Jong-Rak) 대한건축학회 2007 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.27 No.1
While the recent high demand for mega-tall buildings have urged to develop high-performance and high-strength steels, the requirements for steel for architectural structure performance have strengthened as the engineers recognize the potential damage of an earthquake on a tall building. A 600㎫ class steel has emerged to meet these needs, and many studies are currently developing its practical applications on civil engineering and mega-tall buildings. Data on the horizontal force behaviors of structure using the new steel, however, are still insufficient. Especially concerning its toughness, there is an urgent need for the design data, comparing the plastic strain ratios of column-to-beam connections using high-strength steel and regular steel. As one of the first studies on the behavior of a column-to-beam connection using 600㎫ (TMC) class steel, this thesis analyzes its structural performance by conducting a structural test for seismic resistance on a full scale column-to-beam welded connection with non-scallop and recommended scallop details.
위 평활근에서 비교감성 비콜린성 이완반응과 Substance P에 의한 조절
허광식 ( Gwang Sik Heo ),장성종 ( Sung Jong Chang ),박찬국 ( Chan Guk Park ),김만우 ( Man Woo Kim ),장인엽 ( In Youb Jang ),김진호 ( Jin Ho Kim ),신무경 ( Moo Kyoung Shin ),염철호 ( Cheol Ho Yeum ),윤평진 ( Pyung Jin Yoon ),전제열 대한소화기학회 2003 대한소화기학회지 Vol.41 No.5
Background/Aims: In a gastric fundic strip, electrical field stimulation (EFS) evokes TTX-sensitive biphasic responses, consisting firstly of cholinergic contraction followed by a transient relaxation. It is well known that nonadrenergic noncholinergic (NANC) inhibitory nerve mediates a transient relaxation. This study was performed to investigate the characterization of relaxation and its modulation by substance P. Methods: Using Guinea-pig gastric fundic smooth muscle tissues, we recorded mechanical contractions induced by EFS in the organ bath with platinum. Results: NG-nitro-L-arginine methyl ester, an inhibitor of nitric oxide synthase, reduced EFS-induced relaxation and these effects were reversed by L-arginine, a precursor of nitric oxide (NO). Sodium nitroprusside, a NO-donor, suppressed the fundic basal tension. Cell permeable 8-bromo-cGMP inhibited noradrenaline-induced contraction. The application of substance P increased basal tension and EFS-induced contraction and relaxation. NK-1 receptor antagonist ([D-Pro9-(spiro--lactam)9,10-Trp11]-Substance P) inhibited substance P-induced effects. TEA and apamin, K+ channel blockers, increased basal tension and EFS-induced relaxation. Conclusions: These results indicate that NANC inhibitory responses are mainly mediated by NO in the guinea-pig fundus and the release of NO is modulated by substance P through NK-1 receptor and by prejunctional K+ channels. (Korean J Gastroenterol 2003;41:358-365)