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Effects of Chemical Etching and Functionalization Times on the Properties of Cu/Polyimide Films
성기수,황수민,이창민,김원,이승묵,박근철,정승부,임준형,주진호 한국물리학회 2010 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.57 No.61
We fabricated flexible Cu/Polyimide (PI) films by electroless- and electro-Cu plating on surface modified PI via chemical etching and functionalization, and investigated the effects of the modification time on the contact angle, surface energy and morphology, Pd catalyst amount on PI, and resultant peel strength between Cu/PI layers. Chemical etching and successive functionalization were performed on PI surfaces for 0 - 10 min, followed by electroless- and electro-Cu plating. Chemical etching effectively modified the PI surface from a hydrophobic to a hydrophilic state. In addition, chemical functionalization significantly increased the amount of Pd absorption on PI, which consequently enhanced the peel strength between Cu/PI. The peel strength of the resulting Cu/PI film processed by both chemical etching and functionalization for 5 min increased to 5.08 N/cm, which was 4.2 and 2.8 times higher than films processed with functionalization and etching alone, respectively. The highest strength that was achieved was a result of the combined effects of the increased work of adhesion and the increased Pd amount for both treatments; however, the amount of Pd was likely to be the more critical factor for the high level of adhesion between Cu/PI, rather than the work of adhesion.
양극성 우울증 및 정신분열병환자의 혈청 Tryptophan 능도에 관한 연구
성기수,정해익,정태호 대한신경정신의학회 1995 신경정신의학 Vol.34 No.2
In order to define the relationship between the euthymic state or depressive state in bipolar disorder and the serum tryptophan concentration, the authors m easured serum tryptophan concentrations in 33 patients with bipolar disorder(20 depressive and 13 euthymic), 19 patients with schizophreniform disorder and 23 patients with schizophrenia, defined by DSM-IH-R criteria for each disorder. The schizophrenic patients were further subdivided into the not-treated group (who had not received any psychiatric drugs for 4 weeks before) and the treated group and the differences depending on the treatments and/or the duration of illness were assessed. The m ean serum tryptophan concentrations in both groups of patients and the control group (n = 28 ) were measured according to the Denckla & Dewey’s method. The results were as follows : 1) In the patients with depressive bipolar disorder, the m ean serum tryptophan concentration was significantly lower(11.3± 2.4jig/ml) than in the control group(13.1± 2.4(ig/inl) and in the euthymic group(13.6± 1.6ug/ml). 2) The not-treated patients with schizophreniform disorder and schizophrenia showed significantly lower serum tryptophan concentration than the treated patients and the not-treated patients with schizophrenia revealed significantly lower serum tryptophan level(10.5± Z5jig/ml) com pared to the control group and the treated schizophrenia group(13.9±1.6ug/ml). The findings suggest the possible relationship between the depressive symptoms in bipolar disorder and the low serum tryptophan concentration. The authors also observed the low serum tryptophan concentration in the schizophrenic patients who had not been treated
대학의 과학기술교육 어디로 가나 - "굴뚝산업의 IT화"에 총력을
성기수,Seong, Gi-Su 한국과학기술단체총연합회 2000 과학과 기술 Vol.33 No.12
한국은 거국적으로 힘을 모았을때 올림픽에서 4위를 한 경험이 있다. 미국의 중흥을 도운 30년대의 댐계획, 40년대의 원자탄 개발, 70년대의 아폴로 프로젝트처럼 국론통일 바탕위의 국가경제 기사회생 프로젝트로서 "굴뚝산업의 IT화"에 우리 산ㆍ학ㆍ관이 힘을 모으면 지금의 난국은 돌파될 것으로 본다. IT혁명과 교육입국 백년대계를 위하여 발상의 대전환이 절실히 요구된다.