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李慶馥 湖西大學校工業技術硏究所 1989 工業技術硏究所論文集 Vol.8 No.-
Let (X,π) be semiflow. We define the negative para-Liapunov function. More advanced, we investigate the properties of a negative para-Liapunov function. X will be an locally compact metric space, Unless otherwise.
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A study on the set-valued discrete dynamical system $(2^X$, $\overline f )$
이경복 충청수학회 2017 충청수학회지 Vol.30 No.3
This paper is devoted to some dynamical properties such as transitivity, mixing and specification of two discrete dynamical systems $(X,~f)$ and $(2^X,~\overline f)$ on compact metric spaces.
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Mayer-Rokitansky-Kuster-Hauser 증후군의 양쪽 잔유자궁각에서 발생한 자궁근종 1예
이경복,김영남,정대훈,성문수,김기태 대한부인종양 콜포스코피학회 2002 Journal of Gynecologic Oncology Vol.13 No.4
Mayer-Rokitansky-Kuster-Hauser 증후군은 여아 출생수 4000-5000명 당 1명으로 드물게 발생한다. 일반적으로 여성에 있어서 자궁근종의 발생은 비교적 흔하지만 MRKH 중후군의 잔유자궁각에서 발생한 자궁근종의 보고 예는 매우 드물며, 골반종괴 감별 진단시 자궁근종은 마지막으로 고려되어야 한다. 저자들은 최근 Hayer-Rokitansky-Kuster-Hauser 증후군의 양쪽 잔유자궁각에서 발생한 자궁근종 1예를 경험하였기에 간단한 문헌 고찰과 함께 보고하는 바이다. Mayer-Rokitansky-Kuster-Hauser syndrome occurs in only approximately I in 4000-5000 female births. Leiomyoma is a rather common Occurrence in the normal uterus, but extremely rare in mullerian remnants. Leiomyoma should be considered low on the list of differential diagnosis of pelvic mass in women with Mayer-Rokitansky-Kuster-Hauser syndrome. We have experienced a case of Mayer-Rokitansky-Kuster-Hauser syndrome associated with leiomyomas arising from both rudimentary uterine horns and report it with a brief review of literatures.
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THE CHAIN RECURRENT SET ON COMPACT TVS-CONE METRIC SPACES
이경복 충청수학회 2020 충청수학회지 Vol.33 No.1
Conley introduced attracting sets and repelling sets for a flow on a topological space and showed that if $f$ is a flow on a compact metric space, then $\mathcal R(f)=\bigcap \{ A_U \cup A_U^* | U$ is a trapping region for $f\}$. In this paper we introduce chain recurrent set, trapping region, attracting set and repelling set for a flow $f$ on a TVS-cone metric space and prove that if $f$ is a flow on a compact TVS-cone metric space, then $\mathcal R(f)=\bigcap \{ A_U \cup A_U^* | U$ is a trapping region for $f\}$.
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이경복,김신한,오광철 한국자동차공학회 2021 International journal of automotive technology Vol.22 No.1
As emissions regulations are tightened, various engine and emission reduction improvements have been applied. The reduction of particulate matter (PM), a major diesel engine emission, relies solely on after-treatment in the diesel particulate filter (DPF). It is not possible to satisfy current exhaust regulations without a DPF installed downstream of a diesel engine. Therefore, in the design of DPF systems, thermal stability and durability at the high temperatures experienced during the regeneration process are considered critical in determining the substrate material, as any defects (cracking, damage, or melting) cause increased pollutant emissions. In this study, the regeneration characteristics of 10.5 in cordierite DPF substrates applied in large commercial vehicles were investigated according to pore structure. The pore structure was changed while maintaining the thermal expansion coefficient and thermal properties by changing the particle size of talc during fabrication. Two different substrate compositions were evaluated and applied in a 6-L diesel engine to analyze their thermal characteristics during normal and uncontrolled (drop-to-idle) regeneration according to PM loading. The improvement in pore structure was observed to increase the PM oxidation rate under normal regeneration and extended the PM loading limit under uncontrolled regeneration.
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박영배의 수업 · 학습모델-구성주의 (천안공업고등학교를 중심으로)
이경복,박수범 한국학교수학회 2003 韓國學校數學會論文集 Vol.6 No.2
본 논문에서는 1996년 박영배가 제시한 구성주의 수업학습의 모델을 천안공업고등학교 일부 학생들에게 적용하여 수학수준이 낮아서 심각한 공업고등학교 학생들도 구체적인 조작활동을 통하여 수학의 학습 효과를 높일 수 있다는 것을 알았다.
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The Epidemiology of Fracture in Patients with Acute Ischemic Stroke in Korea
이경복,이정곤,김범준,김준엽,이건주,한문구,박종무,강규식,조용진,박홍균,홍근식,박태환,이수주,오미선,유경호,이병철,차재관,김대현,김준태,이준,홍정호,손성일,김동억,최재철,여민주,김욱주,채재은,이지성,이준영,배희준 대한의학회 2019 Journal of Korean medical science Vol.34 No.22
Background: Patients who survive an acute phase of stroke are at risk of falls and fractures afterwards. However, it is largely unknown how frequent fractures occur in the Asian stroke population. Methods: Patients with acute (< 7 days) ischemic stroke who were hospitalized between January 2011 and November 2013 were identified from a prospective multicenter stroke registry in Korea, and were linked to the National Health Insurance Service claim database. The incidences of fractures were investigated during the first 4 years after index stroke. The cumulative incidence functions (CIFs) were estimated by the Gray's test for competing risk data. Fine and Gray model for competing risk data was applied for exploring risk factors of post-stroke fractures. Results: Among a total of 11,522 patients, 1,616 fracture events were identified: 712 spine fractures, 397 hip fractures and 714 other fractures. The CIFs of any fractures were 2.63% at 6 months, 4.43% at 1 year, 8.09% at 2 years and 13.00% at 4 years. Those of spine/hip fractures were 1.11%/0.61%, 1.88%/1.03%, 3.28%/1.86% and 5.79%/3.15%, respectively. Age by a 10- year increment (hazard ratio [HR], 1.23; 95% confidence interval [CI], 1.17–1.30), women (HR, 1.74; 95% CI, 1.54–1.97), previous fracture (HR, 1.72; 95% CI, 1.54–1.92) and osteoporosis (HR, 1.44; 95% CI, 1.27–1.63) were independent risk factors of post-stroke fracture. Conclusion: The CIFs of fractures are about 8% at 2 years and 13% at 4 years after acute ischemic stroke in Korea. Older age, women, pre-stroke fracture and osteoporosis raised the risk of post-stroke fractures.
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