變貌하는 建築의 樣相

李昌淵 건국대학교 1973 공대학보 Vol.2 No.1

Simultaneous Enhancement of the Efficiency and Stability of Polymer Solar Cells

이창연,이원호,이정용,김범준 한국고분자학회 2017 한국고분자학회 학술대회 연구논문 초록집 Vol.42 No.1

뇌 실질 출혈이 동반된 Reye 증후군 1례

이창연,오연희,임문환,유문집,박성기,김태우 동국대학교 경주대학 1991 東國論集 Vol.10 No.-

Reye syndrome is a disorder of unknown etiology in which a child recovering form a viral prodrome suddenly develops pernicious vomiting & eventually develops neurologic changes. The syndrome is defined to acute noninflammatory encephalopathy with fatty degeneration of liver and other organs. The coagulopathy or Reye syndrome is associated with proloned PT caused by the mitochondrial injury compromising synthesis of proteins and clotting factors in liver. In this case, we observed ICH on right parietal and occipital area in brain CT. Actually, bleeding in the major organ is extremely rare in Reye syndrome, this may be the first case report of CNS bleeding in Korea associated with Reye syndrome. In addition to case report, we present a brief review of the related literatures.

6 mm 공막터널과 수직봉합술을 이용한 백내장 수술후 난시의 변화

이창연 아주대학교 1996 아주의학 Vol.1 No.2

Among the patients operated for cataract with phacoemulsification through 6 mm scleral tunnel incision and vertical suture by one surgeon, the author analysed change of postoperative astigmatism of the 42 patients (51 eyes) the for 6 months. The postoperative change of astigmatism was 1.92 diopter at 1 day, 1.20 diopter at 1 week, 0.60 diopter at 4 weeks to with-the-rule direction and was 0.30 diopter at 8 weeks and 0.52 diopter at 6 months to against-the-rule direction by keratometric reading. The surgically induced astigmatism of the age group older than 60 years was not signicantly different from that of the younger group. It is concluded that the change of postoperative astigmatism after scleral tunnel incision and vertical suture in cataract surgery was totally 2.44 diopter and age did not affect the change of postoperative astigmatism.

High-performance all-polymer solar cells via side-chain engineering of the polymer acceptor: the importance of the polymer packing structure and the nanoscale blend morphology

이창연,최준형,강현범,이원호,김태수,김기현,우한영,( Cheng Wang ),김범준 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1

Despite the attractive features of all-polymer solar cells (all-PSCs), i.e., enhanced absorption coefficients, the tunability of their energetic and chemical properties and their thermal and mechanical stabilities, they still face the great challenge of having significantly low power convertsion efficiency (PCE) values of only 3-5%. The prominent origins of the poor efficiency of all-PSCs are the undesirable features of the bulk-heterojunction (BHJ) blend morphology including the phase-separated large-scale domain size, reduced ordering of the polymer chains. Tuning side alkyl chains of conjugated polymers is an effective route for manipulating the blend morphology in BHJ type solar cells. However, the role of side chains in all-PSCs is poorly understood. Herein, we report high-performing all-PSCs with 5.96% efficiency by developing a series of naphthalenediimide (NDI)-based polymer acceptors with different alkyl side chains. We demonstrated that the use of the PNDIT with hexyldecyl side chains produced highly-ordered polymer stackings with strong face-on geometry and at the same time, forming the optimal BHJ morphology with finely separated phase domains, all of which contributed together to induce well-balanced μe/μh ratio and generate efficient all-PSCs with PCEs near 6%.

수직 안진을 동반한 뇌간뇌염 1례

이창연,장무환 동국대학교 경주대학 1993 東國論集 Vol.12 No.-

It is known that meningoencephalitis is the disease usually characterized by a hstory of headache, high fever and disturbance of consciousness. Its cause is usually virus. In most cases, inflammatory reaction involve the brain diffusely, but occasionally involve brain locally. In those cases in whom inflammatory reaction involved brain locally, specific symptoms appear according to the location involved. Clinically, we can suspect the site of brain where inflammatory reaction involved, according to clinical symptoms. We experienced a case of meningoencephalitis with downbeat nystagmus implying that the inflammatory lesion involve pontomedullary junction. It was confirmed by MRI. So, we report it with review of literatures.

도시 대표경관의 인지요인에 관한 탐색적 연구 - 서울시를 중심으로 -

이창연,김한배,Lee, Chang-Yeon,Kim, Han-Bai 한국조경학회 2010 한국조경학회지 Vol.37 No.6

The urban representative landscapes play a leading role in establishing city identity via a symbol of the city and a mediator to make the city all the more worthy of being peculiarized. The study aims at evaluating the perceptive factors in the representative landscapes around the metropolitan Seoul derived from the preliminary researches through questionnaire surveying, in an attempt to analyze their characteristics by type and reason, while further proposing progressive management plans. This study was mostly focused on the visibility factor, activity factor, aesthetic factor and cultural factor influencing on the cognition of urban representative landscapes. The important findings discovered in this research are as follows. First, it was found that people were being interested more on the cultural factors and the activity factors these days rather than visibility factors in the cognition of urban representative landscapes. Second, it was found that the priority rank of urban representative landscapes revealed in this study based on the total account of more diverse perceptive factors, showed so much alteration compared to the previous researches focused mostly upon the visual image.

Design of 2D Conjugated Side Chains for Engineering the Polymer Packing, Interfacial Ordering and Composition Variations of All-Polymer Solar Cells

이창연,김범준 한국고분자학회 2018 한국고분자학회 학술대회 연구논문 초록집 Vol.43 No.1

동국대학 의과대학 포항병원에 1년동안(1989.3.1~1990.2.28)입원한 환자에 관한 조사 연구

이창연,박상후 동국대학교 경주대학 1990 論文集 Vol.9 No.-

We observed patients admitted to Dong Guk University Pohang Hospital from March 1, 1989 to February 28, 1990 and classified them by month, season, department, visited, and by disease according to the International classification of Disease by W.H.O. The results were as follows ; 1) Male to female ratio of in-patients was 1.2 : 1 2) The Internal Medicine department has the largest number of in-patients followed by Obstetrics & Gynecology, General surgery, Orthopaedic surgery, Pediatrics, Neurosurgery, Otolaryngology, Ophthalmology, Urology, Dentistry. 3) The number of in-patients for each staff member per year was 813 patients for Orthopaedic surgery, 454 patients for Internal medicine, 440 patients at obstetrics & Gynecology, 338 patients at Pediatrics, 296 patients at neurosurgery, 274 patients at General surgery, 197 patients at Otolaryngology, 154 patients at Ophthalomlogy, 75 patients at Urology, 12 patients at Dentistry. 4) The average duration of hospitalization was 14.12 days, longest at Orthopaedic surgery, 37.1 days, followed by Neurosurgery, 25.4 days, General surgery, 13.4 days, Urology, 12.1 days, Internal medicine, 10.8 days, Dentistry, 9.2 days, Ophthalmology, 7.9 days, Otolaryngology, 5.7 days, Obstetrics & Gynecology, 5.3 days, Pediatrics, 5.3 days. 5) According to classification of in-patients by area, the number of in-patients from Pohang Si was 3,546, Youngil gun 1,845, Youngduk gun 335, Kyoungju Gun, Uljin Gun 229, Kyoungju Si 213, Ullung Gun 33, and Others 231. 6) Following the International Classification of Disease, the number of in-patients suffering from injury and poisoning is largest, followed by diseases of the digestive system, complications of pregnancy, child-birth, and the puerperium, disease of the respiratory system, infectious and parasitic diseases, diseases of the circulatory system, diseases of the nervous system and sense organs, diseases of the genitourinary system, endocrine nutritional metabolic disease and immunity disorders, mental disorders, diseases of the musculoskeletal system and connective tissue, symptoms signs and ill-defined conditions, diseases of the blood and blood-forming organs, diseases of the skin and subcutaneous tissue, congenital anomalies congenital heart disease and others, certain conditions originating in the perinatal period, neoplasma.

언제나 새로운 고분자, Into the Unknown

이창연 한국전기전자재료학회 2025 E²M-전기 전자와 첨단 소재 Vol.38 No.2