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Multi-Electrode Array를 이용한 뇌 해마의 Total Activity 추산
이정찬,김지은,조정연,손민숙,박경모,박지호,Lee, Jeong-Chan,Kim, Ji-Eun,Cho, Chung-Yearn,Son, Min-Sook,Park, Kyung-Mo,Park, Ji-Ho 대한의용생체공학회 2006 의공학회지 Vol.27 No.6
Research on neural circuit is a difficult area due to complexity and inaccessibility. Due to recent developments, the research using multi-electrode array of cells or tissues has become an important research area. However, there are some difficulties to decode the submerged meaning from huge and complex neural data. Moreover, it needs a harmonic collaboration between informatics and bioscience. In this paper, we have developed a custom-designed signal processing technique for multi-electrode array measured neural responses induced by electrical stimuli to the hippocampal tissue slices of the rat brain. The raw data from hippocampal slice using the multi-electrode array system were saved in a computer. Then we estimated characteristic points in each channel and calculated the total activity. To estimate the points, we used the Polynomial Fitting Approximation Method. Using the calculated total activity, we could provide the histogram or pseudo-image matrix to help interpretation of results.
저온 O<sub>sub2</sub> 어닐링 공정을 통한 HfSi<sub>x</sub>O<sub>y</sub>의 전기적 특성 개선
이정찬,김광숙,정석원,노용한,Lee, Jung-Chan,Kim, Kwang-Sook,Jeong, Seok-Won,Roh, Yong-Han 한국전기전자재료학회 2011 전기전자재료학회논문지 Vol.24 No.5
We investigated the effects of low temperature ($500^{\circ}C$) $O_2$ annealing on the characteristics of hafnium silicate ($HfSi_xO_y$) films deposited on a Si substrate by atomic layer deposition (ALD). We found that the post deposition annealing under oxidizing ambient causes the oxidation of residual Hf metal components, resulting in the improvement of electrical characteristics such as flat band voltage shift (${\Delta}V_{fb}$) by hysteresis without oxide capacitance reduction. We suggest that post deposition annealing under oxidizing ambient is necessary to improve the electrical characteristics of $HfSi_xO_y$ films deposited by ALD.
이정찬 ( Jung Chan Lee ),박정진 ( Jeong Jin Park ),신동혁 ( Dong Hyuk Sheen ),최영미 ( Young Mi Choi ),박남규 ( Nam Gyu Park ),김우규 ( Woo Kyu Kim ),이윤종 ( Yun Jong Lee ),이은봉 ( Eun Bong Lee ),송영욱 ( Yeong Wook Song ) 대한류마티스학회 2004 대한류마티스학회지 Vol.11 No.2
Objective: To determine the effectiveness of pulsed electromagnetic fields (PEMF) in the treatment of knee osteoarthritis (OA). Methods: In this randomized, placebo-controlled, double-blind trial, 51 patients with knee OA, diagnosed according to the criteria of the American College of Rheumatology, were treated with PEMF or placebo. Eleven patients failed to attend after screening and were excluded from analysis. Treatment consisted of 3 half-hour periods of exposure per week over 6 weeks in a specially designed cylindrical device that emits low-frequency pulsed electromagnetic fields (25 gauss, 12 Hz). The primary outcome measure was reduction in pain on movement using a 10 cm visual analog scale. Secondary outcome measures included joint swelling and tenderness, the Lequesne index, and overall evaluations of improvement by the patient and examining physician. Evaluations were made at baseline, 3 week and 6 week during treatment and 4 weeks after finishing treatment. Results: There were no significant differences between PEMF and placebo groups in respect of any outcome measures after treatment. Range of motion and knee swelling tended to be improved in the PEMF group. There were no clinically relevant adverse effects attributable to PEMF treatment. Conclusion: These results suggest that the PEMF treatment has no clinically significant benefits in patients with knee OA resistant to conventional treatment. The larger studies are needed to confirm the efficacy of PEMF therapy in knee OA.
작문사(作文史)적인 관점에서 본 근대 초기 작문 교재 연구
이정찬(Lee Jeong-Chan) 한국언어문학회 2011 한국언어문학 Vol.79 No.-
This study aims to analyze the early modern Writing Text-book and reveal its interpretation and evaluation. Our writing history had been changed variously from 1894 that proclaimed Korean as the national characters. As adopted the Western culture, writing also mixed traditional and western or western replaced traditional one. In this period some one tried to negotiate each other’s differences and the other one emulated western. I choice representative writing text-books to analyze each writing features. There were three books- 〈Sil-Ji-Eung-Young Writing Mothods(實地應用作文法)〉(1909) by Choi Jea-Hak, 〈Sil-Young Writing Mothods(實用作文法)〉(1917) by Lee Gak-Jong and 〈Korean Writing in Middle School(中等朝鮮語作文)〉(1928) by Gang Mea. Each writing text-books had been appeared that how our writing history had been changed. The changes of early modern text-book represent a mode of differences. especially this problems are showed that this process are not universal and effective but sometimes result of compromise, following without critic and emulation. We, of cause, need not exclude this writing history. We must review and evaluate this writing history to seek more development of writing’s study.
근대적 구두법(句讀法)이 읽기와 쓰기에 미친 영향 -근대 전환기를 중심으로-
이정찬 ( Jeong Chan Lee ) 한국작문학회 2008 작문연구 Vol.0 No.7
국문 글쓰기가 확립되어 가면서 근대적 구두법 역시 나타나기 시작했다. <독립신문>의 경우 일반 대중을 독자로 포섭하기 위한 장치로 띄어 쓰기를 사용하였는데 여기에는 음성문자로서의 국문에 대한 인식이 전제되어 있었다. 따라서 의미 단위와 소리 단위를 시각적 장치(space:공백)를 통해 나타내는 띄어쓰기는 읽는 이로 하여금 독서의 효율성을 높일 수있으며 이때의 ‘가상 독자’는 바로 일반 대중이었던 것이다. 다음으로 초창기 문인들은 ‘구어체’ 문장을 구현하는 데 있어 문장 부호를 사용하였다. 구어체란 서술자가 처해있는 당시 일반인들의 일상생활의 말을 그대로 기록해 낸 문장을 말한다. 즉, 문장을 기술하는 사람이 말을 행하는 사람의 입장을 취해서 그의 입장에서 사물을 인식하고, 그 인식된 사물을 그 사람의 말로 표현하는 것이다. 따라서 소설의 경우 다양한 인물이 그 인물의 말로 구현할 때 획득할 수 있는 것이다. 즉, 문장부호가 음성 언어가 지닌 어조, 음색, 속도, 고저, 억양 등을 문자 언어에서 구체화할 수 있도록 도움으로써 인물의 대사가 더욱 인물의 ‘음성’에 가깝도록 유도하는 것이다. 끝으로 이러한 일련의 변화는 독서 방식에 있어서도 ‘소리 내어 읽는’ 읽기에서 ‘눈으로 읽는’ 읽기로의 변화를 촉진시켰다. 이는 독자로 하여금 텍스트를 읽을 때 더 이상 타인이나 자신이 내는 소리에 영향을 받지 않고, 텍스트가 내는 ‘내면의 소리’에 귀를 기울이도록 하였다. A modern punctuation appeared by put Korean writing on a firm footing. In case of <The Independent>, it used a spacing in order to induce general people. A spacing, therefore, that distinguishes between meaning unit and phonetic unit can improve people`s readability. Next, The early writers used a modern punctuation to realize a colloquial style. A colloquial style is a writing through oral language in those days. In other words, a narrator thinks like a actor and speaks like a actor in a modern novel. Thus, a narrator has to take each actor`s voices and writer uses a punctuation to achieve the purpose. Because a punctuation help a literary expression get a tone, pace, pitch and intonation. Finally, These changes bring on the transition oral reading into silent reading. When a people reads, he need not be had influence on his voice or the other`s one and he only has to concentrate sound of text.
침자극이 불안 환자와 정상 성인의 피부전도도에 미치는 영향
정명숙 ( Myeong Suk Jeong ),최우진 ( Woo Jin Choi ),이경원 ( Kyung Won Lee ),이승기 ( Seung Gi Lee ),김지은 ( Ji Eun Kim ),이정찬 ( Jeong Chan Lee ),박경모 ( Kyung Mo Park ) 대한한방신경정신과학회 2009 동의신경정신과학회지 Vol.20 No.2
Objectives: The purpose of this study was to investigate the effects of acupuncture on autonomic nervous system in anxiety patients and normal subjects by using SCR(Skin Conductance Response). Methods: The study group consists of 15 anxiety patients as the experimental group stimulated by verum acupuncture, 15 anxiety patients as the control group stimulated by sharm acupuncture, and 15 normal subjects stimulated by verum acupuncture. We measured GSR of experimental and control group, normal subjects during Working Memory Test and acupuncture stimulation. Results: 1. Measured value of SCR during Working Memory Test was significant different in control group, but it was not significant different in experimental group. 2. SCR value of three groups was significantly decreased during acupuncture stimulated. There was only significantly SCR value change during 0min.-5min. of first acupuncture. The section of the other groups was no significantly different. 3. STAI scores of experimental group and control group were significantly decreased. Conclusions: The study results suggest that acupuncture stimulation and sham acupuncture also effective on activity in the sympathetic nervous system and STAI scores.
류마티스 : 전신홍반루푸스로 오인된 혈관내B대세포림프종 1예
박찬걸 ( Chan Keol Park ),이정찬 ( Jeong Chan Lee ),강성욱 ( Seong Wook Kang ),심승철 ( Seung Cheol Shim ),윤환중 ( Hwan Jung Yun ),김진만 ( Jin Man Kim ),유인설 ( In Seol Yoo ) 대한내과학회 2015 대한내과학회지 Vol.89 No.6
Intravascular large B-cell lymphoma (IVLBCL) is a rare subtype of non-Hodgkin’s lymphoma (NHL) and that progresses rapidly and is usually fatal. Because it usually presents with nonspecific symptoms, such as fever, the early diagnosis of IVLBCL is very difficult and it is often misdiagnosed as another disease. Systemic lupus erythematosus (SLE) is an autoimmune disease that affects various organs. The clinical manifestation of SLE ranges from rash and arthritis through anemia and thrombocytopenia to serositis, nephritis, seizures, and psychosis. Thus, it can be easily confused with many other disorders. We report a case of IVLBCL mimicking SLE in the initial diagnosis. (Korean J Med 2015;89:746-751)