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거자법(巨刺法)위주의 침치료(鍼治療)가 뇌졸중(腦卒中) 환자(환자)의 기능 회복에 미치는 영향(影響)
서정철,정병식,윤형석,조성규,김윤미,김종인,이윤호,Seo, Jung-Chul,Cheong, Byung-Shik,Yun, Hyong-Seok,Cho, Seong-Gyu,Kim, Youn-Mi,Kim, Jong-In,Lee, Yun-Ho 대한침구의학회 2001 대한침구의학회지 Vol.18 No.3
Objective : In order to study the effect of contralateral acupuncture on recovery of motor disorders in stroke patients a clinical study was performed. Methods : Thirteen patients with poststroke-hemiplegia were randomized into two groups. Six patients(test group) treated with contralateral acupuncture. The other seven patients(control group) treated with ipsilateral acupuncture. The activity of daily living was measured with a modified barthel index(MBI). The therapy was performed one a day for 3 weeks. Results : In terms of improvement of activity of daily living, the test group showed statistically meningful increase after 1 week treatment. but the control group showed statistically meningful increase after 2 weeks(p<0.05). In terms of score of MBI, the groups showed no statistically meningful difference after 3 week treatment. Conclusions : These results support that contralateral acupuncture therapy has almost same effectness compared with ipsilateral acupuncture therapy in improvement of the activity of daily living of poststroke-hemiplegic patients.
결합형 모드록킹 극초단 색소레이저의 공진기 길이변화 특성
서정철,정영붕,김동호 한국광학회 1990 한국광학회지 Vol.1 No.1
결합형 모드록킹 극초단 색소레이저의 공진기 길이변화에 따른 펄스폭의 변화를 선형 자체상관기를 이용하여 연구하였다. 색소레이저의 공진기 길이가 여기레이저의 공진기 길이와 일치하였을 경우 펄스폭은 0.64ps이며 완벽하게 모드록킹 되었다. 그러나 최적조건보다 색소레이저 공진기 길이가 긴 경우나 짧은 경우에는 펄스폭은 넓어지며 불완전 모드록킹이 되었다. 즉 색소레이저의 공진기 길이가 여기레이저의 공진기 길이보다 길 경우는 자연방출에 의한 noise 때문에 broad base 가 형성되며, 색소 이득이 증가되기 때문에 자체 상관함수의 첨두출력은 최적조건에서의 색소레이저 공진기 길이보다 5 $\mu\textrm{m}$ 긴 조건에서 최대가 되었다. 또 색소레이저의 스펙트럼은 자연방출에 의한 형광 및 색소 이득이 증가되기 때문에 넓게 됨을 관찰할 수 있었다. 그러나 색소레이저의 공진기 길이가 여기 레이저의 공진기 길이보다 짧은 경우에는, 색소 이득이 적게 됨으로 자체 상관함수의 첨두출력도 약하게 되며 스펙트럼의 전반치폭은 좁게 되었다. 한편 최적조건을 벗어나면 스펙트럼의 중심파장이 이동되는 현상을 관찰할 수 있었다. The cavity-length detuning characteristics of the hybridly mode-locked dye laser have been studied with a collinear autocorrelator. In the optimum condition, the pulse width is 0.65 ps about three times as short as that of the synchronously mode-locked dye laser. As the cavity length is increased, the pulse width becomes broader than that at the optimum cavity length because of the effect of spontaneous emission. Also, the spectrum width becomes broad, therefore the time bandwidth product ($\Deltat\Deltav$) is increased. The peak power of autocorrelation is maximum at $\Deltat=5.0\umm$ longer than the optimum cavity length. On the other hand, as the cavity length is decreased, the pulse width becomes broader and the satellite pulses appear because of the gain recovery. Also the spectrum width becomes narrower than that at the optimum cavity length. In particular, at the mismatched cavity length the center of the lasing spectrum moves to shorter wavelengths. ngths.
Microalgae-derived hollow carbon-MoS2 composite as anode for lithium-ion batteries
서정철,Nurzhan Umirov,박승빈,이규복,김성수 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.79 No.-
We developed a novel composite structure of MoS2 and naturally derived carbon as anode materials forlithium-ion batteries by using microalgae as both source materials and templates for nitrogen-dopedhollow carbon with three dimensional internal structures. The microalgae-derived carbon performed theroles as conducting matrix and template for vertically stacked MoS2 nanosheets. The electrochemicalperformance of microalgae-derived carbon-MoS2 composite materials evaluated in half-cell systemagainst lithium metal electrode secured capacity of 300 mA h/g after 880 cycles at current density of 5 A/g. We ascribe the excellent cycle performance to the unique structure of hollow spherical microalgae-derived carbon with rich inner structures and naturally doped nitrogen, which consequentially facilitatefast lithium ion transport. This kind of structuring strategy is advantageous in terms of utilizing naturallycreated structures of microbes with complexed inner organelles and trace of heteroatoms, not to mentionin respect of producing value added material from biomass residues.
롤랑 바르트 Roland Barthes 의 글쓰기와 언어학
서정철 한국불어불문학회 1990 불어불문학연구 Vol.25 No.1
L'oeuvre de R. Barthes est un long cheminement au cours duquel il se change et me´tamorphose constamment. D'ou` la difficulte´ pour une synthe´se d'apre`s un point de vue particulier. Cependant la linguistique peut constituer une me´thode d'approche utile et efficace d'autant plus qu'il est parti comme linguiste et qu'il en a tire´ des concepts et des ide´es pour analyser la litte´rature et le texte. La pre´sente e´tude constitue une des trois parties qui lui sont consacre´es. Elles se composent donc 1. Le concept de l'e´criture et la linguistique 2. La se´miologie et la mythologie 3. L'analyse du texte Et celle-ci comprend les chapitres suivants. 1) la litte´rature et le langage 2) la langue, le style et l'e´criture 3) l'e´criture et l'engagement 4) l'e´crivain et l'e´criture 5) les contradictions et l'apport En fin de compte, Barthes, a` force de vouloir nous faire changer notre point de vue petit-bourgeois, ne cesse de nous lancer des formules e´clatantes, souvent contradictoires. Cependant si nous ne tenons pas trop a` ses contradictions apparentes, nous pouvons de´couvrir la richesse d'une pense´e qui continuera a` encore marquer le monde intellectuel.