미국 정면 New NCAP 대응 구속장치 기술 연구

임경택(Kyungtaek Lim),안택영(Taekyoung Ahn),윤종영(Jongyoung Yoon),김경철(KyungCheol Kim) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

National Highway Traffic Safety Administration (NHTSA) has released revised New Car Assessment Program (NCAP) in July 2008. New frontal NCAP includes the enhanced contents that are extended body injury areas, down injury scale levels and change of the passenger dummy to 5%ile female. Injury probability of new frontal NCAP was increased compared to current one for the same vehicles according to NHTSA research tests. On this study, we analyzed the injury mechanism of each body region (head, neck, chest and femur) and found the countermeasures of restraint systems. The characteristics of airbag, seatbelt and knee bolster are presented to help their design for new frontal NCAP.

생태경관보전지역인 삼육대 불암산 조류 종 관찰을 통한 제명호의 생태적 가치 연구

임경택(Kyungtaek Lim),신채율(Chaeyul Shin),최리아(Lia Choi),한다현(Dahyun Han),정훈 반려동물연구학회 2022 Animalia Vol.4 No.1

본 연구는 생태·경관보전 지역인 삼육대 불암산의 조류 종 관찰을 통해 2017년 관찰 결과와 비교하여 제명호의 생태적 가치에 대해 연구하였다. 6월 25일부터 9월 26일까지 총 20번의 현장조사를 진행하였고, 제명호~삼육대 후문 까지를 세부 조사 지역으로 정하였다. 조사지역에서 하루 2시간 이내로 쌍안경과 카메라를 이용하여 직접 관찰, 또는 소리를 이용해 동정 후 기록하였다. 그 결과 2017년의 제명호 인근 조류 종 관찰 자료는 약 35 종이 관찰되었으나 이번에는 29종으로 감소하였으며, 관찰된 보호종 또한 10종에서 8종으로 감소하였다. 감소의 원인으로는 늘어난 강수량과 물이 충분히 고이지 않는 웅덩이로 꼽고 있으며 본 연구결과는 생태·경관보전 지역인 불암산 제명호 부근의 조류 서식지 훼손 및 훼손 가능성을 판별하여 서식지의 보강 및 앞으로의 관리에 대한 개선방안을 고찰하는데 중요한 자료가 될 것으로 예상된다. This study was aimed to examine and study the ecological values of Jemyung Lake compared to the observation results in 2017 through the observation of bird species of Buram Mountain in Sahmyook University, an Ecological Landscape Conservation Area(ELCA). For achieving the aim of this study, a total of 20 field investigations were conducted from June 25,2022 to September 26, 2022, and the area from Jemyung Lake to the back gate of Sahmyook University was set up for a detailed investigation area. Within 2 hours a day in the detailed investigation area, we directly recorded observation with binoculars and camera or sorted by the sound of bird species. The results of the analysis are that about 35 bird species investigation data near Jemyung Lake were observed in 2017, but this time, the number of bird species decreased to 29, and the observed legal protected species also decreased from 10 to 8. The reason for the decrease is that increased precipitation and puddles that does not form enough water. The implication of the study is to be an important data for improvement plan consideration about habitats reinforcement and care for future through discrimination of bird habitats damage and the possibility of damage near Jemyung Lake in Buram Mountain, an Ecological Landscape Conservation Area(ELCA)

SUPER 콘크리트의 양생방법에 따른 장기재령에서의 압축강도 발현 특성 분석

임광모(Lim, Kwnangmo),김경철(Kim, Kyongchul),윤용식(Yoon, Yongsik),류금성(Ryu, Gumsung),고경택(Koh, Kyungtaek) 대한토목학회 2023 대한토목학회 학술대회 Vol.2023 No.10

동절기 저온환경에서 양생한 UHPC의 압축강도 발현 평가

임광모(Kwangmo Lim),윤용식(Yongsik Yoon),고경택(Kyungtaek Koh),김경철(Kyongchul Kim) 한국방재학회 2023 한국방재학회논문집 Vol.23 No.6

동절기 저온 환경에서 콘크리트 품질이 저하되는 문제는 꾸준히 보고되고 있다. 콘크리트의 품질을 평가하고 확보하기 위한 노력은 지속되어 왔으나 주로 압축강도 확보를 위해 화학 혼화제를 포함한 배합 재료의 개선 및 양생 기술에 관한 연구에 집중되어왔다. 본 연구에서는 추가적인 조치가 없는 조건에서 재령이 증가함에 따라 압축강도가 발현되는 경향을 확인하고자 하였다. 100 MPa급 초고성능 콘크리트(UHPC)에 대하여 0 ℃ 및 -15 ℃ 조건에서 양생한 콘크리트의 압축강도를 측정하였다. 또한, 초기 동해피해를 입은 UHPC가 일정 기간 동안 상온에서 회복 기간을 갖는 경우 압축강도가 발현되는 경향을 비교하였다. 실험 결과 초기 동해를 입은 UHPC는 재령 84일에서 목표 압축강도 수준으로 발현되는 것을 확인할 수 있었다. 본 연구의 결과는 향후 동절기 환경에서 UHPC의 특성을 이해하고, 동절기 시공 계획수립에 기여할 수 있을 것이다. Deteriorating concrete quality is a typical problem reported in a low-temperature environment in winter. Therefore, efforts to evaluate and secure the quality of concrete are always carried out. In this study, the researchers primarily focused on developing curing methods and improving the quality of mixing materials, including chemical admixture, to secure compressive strength of concrete. The study investigated the compressive strength of concrete according to its age and observed that the compressive strength increases under the experimental conditions without any additional protection measures for the winter season. The compressive strength of the cured concrete was measured at 0 and -15 ℃ for 100 MPa Ultra-high-performance concrete (UHPC). Additionally, the property of compressive strength was compared with that of UHPC, which suffered damage due to the cold, went through a certain recovery period at room temperature. Consequently, it was confirmed that UHPC, damaged from the cold weather, achieved the specific compressive strength after 84 days. The findings from this study can enhance further understanding of the characteristics of UHPC in winter environments and contribute to establishing a construction plan for withstanding the winter seasons.

남북한 도로교 설계기준을 반영한 교량 상부구조 활하중 분석

임광모(Kwangmo Lim),김경철(Kyoungchul Kim),강재윤(Jaeyoon Kang),손민수(Minsu Son),고경택(Kyungtaek Koh) 한국방재학회 2022 한국방재학회논문집 Vol.22 No.3

남북한은 다양한 사회적 어려움에도 불구하고 최근까지도 건설인프라 협력 사업을 추진하였다. 이러한 건설인프라 협력사업을 진행하기 위해서는 기반기술의 구축이 필요할 것이다. 따라서, 본 연구는 향후 남북 관계 개선에 대비하여 기반기술의 구축을 위한 남북한 교량설계기준 분석을 수행하였다. 북한 도로현황 분석과 최신 교량설계기준을 확보하여 고정하중, 온도하중 및 차량 활하중 등을 검토하였다. 남북한 교량설계기준 분석 결과를 활용하여 강섬유보강 초고성능콘크리트를 적용한 U-형상의 거더교를 모델링하였다. 교량 상부구조의 활하중 검토 결과, 북한의 최신 차량하중을 적용한 경우, 남한의 KL-510 하중과 유사한 경향을 나타내었다. 다만 상세한 비교를 위해서는 단면형식과 사용재료에 대한 추가 검토가 필요할 것으로 판단된다. 이러한 연구결과는 향후 남북 인프라 협력 또는 북한의 인프라 시장 진출 시 남북간 건설기준 연계 기술을 구축하기 위한 기초자료로 활용될 것으로 기대된다. Despite various social difficulties, the Korean peninsula has promoted cooperation for infrastructure development. These infrastructure cooperation projects must establish a fundamental technology with an understanding of both North and South Korea. Therefore, this study analyzed bridge design standards of both countries for establishing infrastructure technology. The design standards, such as the dead, live, and temperature loads, were comparatively investigated by securing the North Korean road design standards and the latest road status. Based on the investigation results of the bridge design standards, the U-type girder bridge with ultra-high-performance concrete was modeled for analytical comparisons. From the analysis results of the bridge superstructure, the latest vehicle load of North Korea standard showed a similar trend to the KL-510 load of South Korea. However, an additional detailed investigation has required a specific comparison, including the cross-section, materials, and so on. This research would be expected to be fundamental data for establishing cooperation for infrastructure development in the Korean peninsula.

연료 개질 모델 가스를 이용한 Pt-based 촉매에서의 NOx 변환 특성에 관한 연구

임수철(Suchol Lim),이경택(Kyungtaek Lee),송순호(Soonho Song),전광민(Kwang Min Chun) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

This experiment was conducted by using Pt/Al₂O₃, Pt/SiO₂ and Pt/CeO₂ catalysts with C₃H?, H₂, CO and their mixtures in with and without H₂O conditions. When reductant condition was C₃H? 2400ppmC₁, Pt/Al₂O₃ and Pt/SiO₂ catalysts showed maximum NOx conversion efficiency 45% at 250℃ 53% at 250℃, 14% at 400℃ respectively without H₂O conditions, In H₂ 2400ppm condition, more than 200℃, NOx conversion efficiency was decreased in the order of Pt/SiO₂, Pt/CeO₂, Pt/Al₂O₃, on the other hand, Pt/CeO₂ catalyst showed maximum 35% NOx conversion in 250℃. In mixture of C₃H? 1200ppmC₁ and H₂ 1200ppm condition, in 200℃, Pt/Al₂O₃, Pt/SiO₂, Pt/CeO₂ showed maximum 45%, 53%, 15% NOx conversion respectively, Especially Pt/Al₂O₃ catalyst showed wide temperature range. Experiments was conducted in a several ratio between H₂ and CO. Conclusion is that addition of CO is generally deactivation factor in NOx conversion. Compare with and without H₂O condition in a ratio between H₂ and CO, inclusion of H₂O is deactivation factor in NOx conversion.

T Cell Stimulatory Effects of Korean Red Ginseng through Modulation of Myeloid-Derived Suppressor Cells

Chanoh Jeon,Soowon Kang,Seungbeom Park,Kyungtaek Lim,Kwang Woo Hwang,Hyeyoung Min 고려인삼학회 2011 Journal of Ginseng Research Vol.35 No.4

Myeloid-derived suppressor cells (MDSCs) actively suppress immune cells and have been considered as an impediment to successful cancer immunotherapy. Many approaches have been made to overcome such immunosuppressive factors and to exert effective anti-tumor effects, but the possibility of using medicinal plants for this purpose has been overlooked. Korean red ginseng (KRG) is widely known to possess a variety of pharmacological properties, including immunoboosting and anti-tumor activities. However, Little has been done to assess the anti-tumor activity of KRG on MDSCs. Therefore, we examined the effects of KRG on MDSCs in tumor-bearing mice and evaluated immunostimulatory and anti-tumor activities of KRG through MDSC modulation. The data show that intraperitoneal administration of KRG compromises MDSC function and induces T cell proliferation and the secretion ofIL-2 and IFN-y, while it does not exhibit direct cytotoxicity on tumor cells and reduced MDSC accumulation. MDSCs isolated from KRG-treated mice also express significantly lower levels of inducible nitric oxide synthase and IL-I 0 accompanied by a decrease in nitric oxide production compared with control. Taken together, the present study demonstrates that KRG enhances T cell function by inhibiting the immunosuppressive activity of MDSCs and suggests that although KRG alone does not exhibit direct anti-tumor effects, the use of KRG together with conventional chemo- or immunotherapy may provide better outcomes to cancer patients through MDSC modulation.

터키 차나칼레 교량 케이슨제작을 위한 드라이독 설계·시공 사례

김호비(Kim, Hobi),김경택(Kim, Kyungtaek),임석동(Lim, Suckdong),김형곤(Kim, Hyunggon),백한솔(Paik, Hansol),조서경(Cho, Seokyung) 대한토목학회 2018 대한토목학회 학술대회 Vol.2018 No.10

Role of systematic lymphadenectomy in patients with intermediate to high-risk early stage endometrial cancer

Nae Ry Kim,소경아,Tae Jin Kim,Kyungtaek Lim,Ki Heon Lee,김미경 대한부인종양학회 2023 Journal of Gynecologic Oncology Vol.34 No.3

Objective: To determine the clinical significance of systematic lymph node dissection (LND) and to better define the relevant extent of LND in intermediate- to high-risk early stage endometrial cancer (EC). Methods: Patients who received surgery as a primary treatment of histologically confirmed EC and preoperatively considered as uterus-confined early stage disease were included in the study population. The rates of lymph node metastasis (LNM) according to the risk groups and anatomic sites were assessed. Univariate and multivariate analyses were performed to evaluate risk factors for recurrence. Results: A total of 804 patients were included in the study analysis. The rates of LNM were significantly different according to the risk group; 1.2% in low-risk, 20.1% in intermediate-risk, and 30.0% in high-risk group. When assessing the rates of LNM in individual anatomic sites, positive LNs were evenly distributed throughout the pelvic and para-aortic regions. In the intermediate to high-risk EC cases, the rates of para-aortic LNM below and above inferior mesenteric artery (IMA) were 11.1% and 12.5%, respectively. On multivariate analysis, LNM was the only independent risk factor for recurrence in the intermediate to high-risk EC (hazard ratio=2.63, 95% confidence interval=1.01–6.82, p=0.047). Conclusion: LNM was frequently observed in intermediate- and high-risk early stage EC and it served as an independent risk factor for recurrence. When considering the similar rates of LNM between below and above IMA, nodal assessment needs to be performed up to the infra-renal level, especially for the staging purpose in high-risk EC.

영종도 스마트 물 공급망 구축에 관한 연구

심병섭(Byoungsup Shim),강석락(Seokrak Kang),임경주(Kyungjoo Lim),김효성(Hyoseoung Kim),최석준(Seokjun Choi),염경택(Kyungtaek Yum) 한국통신학회 2016 한국통신학회 학술대회논문집 Vol.2016 No.6