Study on Aging Effect of Adhesion Strength Between Polyimide Film and Copper Layer

Seok‑Bon Koo,Chang‑Myeon Lee,Sang‑Jun Kwon,Jun‑Mi Jeon,Jin‑young Hur,Hong‑Kee Lee 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.1

This paper experimentally confirmed that the adhesion strength of the copper layer formed on the surface of the polyimidefilm by wet plating greatly changes with the aging time. The adhesion strength of the copper layer showed a rapid increasefrom 4 to 10 h after aging had begun and then converged to a value without a significant change. The adhesion enhancementbetween polyimide film and copper layer by aging is due to the interlocking effect caused by the volume expansion of copperoxide (CuO) formed in the polyimide, the increased mobility of copper particles enlarged by the decrease of impuritiesin the copper layer grain boundaries, and the consequent change of the crystal structure of the copper layer leading to theinternal stress reduction. Such adhesion improvement can be confirmed by the progress of the cohesive failure indicatingthe breakdown of the polyimide film.

Conceptual Study for Tissue-Regenerative Biodegradable Magnesium Implant Integrated with Nitric Oxide-Releasing Nanofi bers

Jin‑Kyung Jeon,Hyunseon Seo,Jimin Park,Soo Ji Son,Yeong Rim Kim,Eun Shil Kim,Jong Woong Park,Woong‑Gyo Jung,Hojeong Jeon,Yu‑Chan Kim,Hyun‑Kwang Seok,Jae Ho Shin,Myoung‑Ryul Ok 대한금속·재료학회 2019 METALS AND MATERIALS International Vol.25 No.4

The excessive initial corrosion rate of Mg is a critical limitation in the clinical application of biodegradable Mg implantsbecause the device loses its fi xation strength before the fractured bone heals. This study suggests a new approach to overcomethis hurdle by accelerating tissue regeneration instead of delaying the implant biodegradation. As angiogenesis is anessential process in early bone regeneration, a Mg implant coated with electrospun nanofi bers containing nitric oxide (NO),which physiologically promotes angiogenesis, is designed. The integrated device enables adjustable amounts of NO to bestored on the NO donor-conjugated nanofi ber coating, stably delivered, and released to the fractured bone tissue near theimplanted sites. An in vitro corrosion test reveals no adverse eff ect of the released NO on the corrosion behavior of the Mgimplant. Simultaneously, the optimal concentration level of NO released from the implant signifi cantly enhances tube networkformation of human umbilical vein endothelial cells without any cytotoxicity problem. This indicates that angiogenesis canbe accelerated by combining NO-releasing nanofi bers with a Mg implant. With its proven feasibility, the proposed approachcould be a novel solution for the initial stability problem of biodegradable Mg implants, leading to successful bone fi xation.

A Study on Electrical Characteristics of Outdoor Termination with Viscosity of Insulating Oil

Jin‑Wook Choe,Seok‑Hyun Nam,Jin‑Gyu Kim 대한전기학회 2020 Journal of Electrical Engineering & Technology Vol.15 No.3

Outdoor terminations connecting overhead transmission lines and power cables comprise a stress relief cone, which is made of silicone rubber, and insulating oil in a composite or porcelain insulator. The lower the insulating oil viscosity, the greater is its ease of injection. However, the swelling and the degree of change in the electrical properties of the silicone rubber increase with a decrease in the insulating oil viscosity. Therefore, the efect of the expected change in the electrical proper‑ ties of the silicone rubber on the outdoor termination quality should be examined before choosing the insulating oil. In this study, specimens made of insulating and semiconducting silicone rubber were made to swell by impregnating them with three types of insulating oils with diferent viscosities. The AC breakdown strength of the swollen insulating specimens and the volume resistivity and relative permittivity of the semiconducting specimens were measured. The Weibull statistical analysis showed that the lower the insulating oil viscosity, the lower was the AC breakdown strength in overlapping con‑ fdence intervals. The volume resistivity and relative permittivity of the semiconducting specimens changed considerably with a change in the viscosity of the insulating oil. In particular, the volume resistivity of the specimen impregnated with the lowest viscosity insulating oil was 1.57×106 Ω m, indicating loss of semiconducting properties. Furthermore, the efect of changes in the electrical characteristics of the specimens on the outdoor termination quality was examined by performing an electric feld analysis. Compared with the other oils, impregnation with the lowest viscosity insulating oil resulted in the electric feld strength at the edge of the outer semiconducting layer increasing by 15.7%.

병원의 품질경영혁신 활동과 조직성과의 관계에서 성과측정시스템의 역할에 관한 연구

박환석(Park, Hwan-seok),손성진(Son, Sung-jin) 한국국제회계학회 2020 국제회계연구 Vol.0 No.90

본 연구는 병원의 품질경영혁신(TQM) 활동과 조직성과의 관계에서 성과측정시스템(PMS)의 이용방식과 공정성이 매개역할을 하는지를 규명하고자 하였다. 연구목적을 달성하기 위해 투입 차원은 병원 TQM 활동의 수준으로, 전환 차원은 PMS 진단 및 상호작용적 이용방식과 PMS 공정성 수준으로, 산출 차원은 조직의 성과(구성원 태도, 재무/비재무성과)로 설정하였다. 연구가설 1은 병원 TQM 활동의 수준과 조직성과의 관계, 가설 2는 그 관계에서 PMS 이용방식의 역할, 그리고 가설 3은 병원 TQM 활동수준, PMS 이용방식, PMS 공정성, 그리고 조직성과의 순차적인 인과관계를 규명하는 것이다. 본 연구의 결과는 다음과 같다. 첫째, 병원의 TQM 활동수준은 구성원 태도와 비재무성과에 정(+)의 영향을 미쳤다. 그러나 재무성과에는 유의한 영향을 미치지 않았다. 둘째, 병원의 TQM 활동수준과 조직성과의 관계에서 PMS 진단적 이용은 매개역할을 하였으나, PMS 상호작용적 이용은 매개역할을 하지 못하였다. 셋째, 병원이 TQM 활동을 추진하면서 PMS 진단적 이용을 선택한다면 구성원의 태도 변화를 경유 하여 재무/비재무성과가 개선되었다. 그런데 PMS 상호작용적 이용을 선택한 경우에는 PMS의 공정성 수준이 높아져야지만 구성원의 태도가 변하고 재무/비재무성과의 개선으로 연계되었다. 본 연구는 병원이 TQM을 추진하는 과정에서 경영통제 차원에서 성과측정시스템을 적절히 관리하고 인적자원관리 차원에서 구성원 태도를 변화시키려는 노력은 병원조직성과의 개선에 공헌할 수 있다는 점을 시사하고 있다. This study is aimed to investigate whether use of performance measurement system (PMS) and justice of PMS play a mediating role in the relationship between TQM activities of hospital and organizational performances. We defined TQM activities of hospital as input variable, diagnostic and interactive use of PMS, justice of PMS as conversion variables, and organizational performances (attitude of internal members, financial / non-financial performances) as output variables in order to test hypotheses. Hypothesis 1 is to test the relationship between level of TQM activities of hospital and organizational performances. Hypothesis 2 is to explore a mediating role of the diagnostic and interactive use of PMS in the relationship. And Hypothesis 3 is to identify casual relationship among TQM activities of hospital, the diagnostic and interactive use of PMS, the justice of PMS, and the organizational performances. The results of the study are as follows. Firstly, the TQM activities of hospital have a positive effect on the attitude of internal members and non-financial performance. However, the effect of TQM activities of hospital on financial performance are not significant. Secondly, the diagnostic use of PMS has played a mediating role in the relationship between the TQM activities of hospital and the organizational performances, but the interactive use of PMS does not play a mediating role in the relationship. Thirdly, if hospital use the diagnostic control of PMS in the process of promoting TQM activities, financial / non-financial performances have improved through changes in the attitudes of internal members. However, in case of using the interactive control of PMS, the attitude of internal members changed as the justice of PMS increased, which is linked to improvement of financial / non-financial performances. This study suggests that efforts in the process of pursuing TQM activities trying to manage properly performance measurement systems in management controls and to change employee attitude in terms of human resource management can contribute to improve the organizational performances of hospital.

공매도의 수익률예측성과 미래이익반응계수에 관한 연구

이용석(Lee, Yong-Seok),박희진(Park, Hee-Jin),김범준(Kim, Bum-Joon) 한국국제회계학회 2018 국제회계연구 Vol.0 No.78

본 연구의 목적은 기업별 공매도 체결내역을 기초로 공매도 거래와 회계정보의 유용성 간의 관련성을 분석하는 것이다. 일반적인 주식투자에 비해 공매도는 상대적으로 위험이 큰 투자안이므로 공매도 투자자는 위험을 회피하기 위하여 보다 적극적으로 회계정보를 활용할 가능성이 높다. 이에 본 연구에서는 공매도 투자자가 공매도 거래시 기업의 영업성과와 관련된 회계정보를 어떻게 활용하는지를 살펴보았으며, 추가적으로 FERC 모형을 이용하여 거래비중이 높은 기업에서 당기 주식수익률이 미래이익을 보다 정확하게 반영하고 있는지를 분석하였다. 분석결과, 투자자가 공매도 거래시 기업의 영업성과와 관련된 회계정보를 이용하여 추가적인 양(+)의 초과수익을 달성할 수 있음을 확인하였으며, 이를 통해 공매도 투자시 회계정보를 활용할 충분한 유인이 존재함을 보였다. 아울러 공매도 거래비중이 높은 기업에서 당기주식수익율과 미래이익간의 양(+)의 관련성이 더 높은 것으로 나타나, 공매도 거래비중이 높은 기업일수록 당기수익율이 보다 정확하게 미래이익을 반영하고 있다는 점을 실증적으로 제시하였다. 공매도는 전문적 투자자가 투자대상기업의 내재가치 변경을 예상할 때 발생한다는 선행연구의 결과와 유사하게 본 연구는 공매도 투자시 투자기업의 회계정보가 투자의사 결정의 유용한 정보가 될 수 있음을 보였으며, 공매도 투자자가 기업의 미래수익률을 보다 정확하게 예측한다는 Drake et al.(2011)의 연구결과가 국내 주식시장에서도 일관되게 나타난다는 점을 확인하였다. 공매도 거래비중이 높은 기업일수록 기업의 미래이익반응계수가 상대적으로 높은 것으로 나타났는데 이는 공매도 투자자들이 자본시장에서 회계정보를 잘 이용하게 할 수 있는 정보 촉매제 역할을 하고 있음을 시사하는 것으로 Pownall and Simko(2005)의 주장과도 일치되며, 직접적인 공매도거래가 아닌 대차잔고를 이용하여 연구를 실시한 Drake et. al.(2015)의 연구결과와도 유사한 결과이다. 본 연구는 자본시장에서 공매도 투자자가 정보중개인의 역할을 수행하고 있다는 점을 밝혔으며, 아직까지 공매도에 대한 인식에 차이가 존재하는 금융당국 · 투자자 및 기업들에게 공매도에 대한 유용한 새로운 시각을 제공한다. The purpose of our study is to analyze the relationship between the short sale transaction and the usefulness of accounting information based on the short sales transaction data. Since short selling is relatively high risk compared to stock trading, short selling investors are more likely to actively use accounting information to avoid risk. In this study, we investigate whether short selling investors use accounting information related to the company"s performance when doing short selling. In addition, we use the FERC model to analyze whether the current profitability is more accurately reflect future profit. According to the result of our analysis, investors can obtain additional positive earnings by using the accounting information related to the performance of the company during the short sale. Therefore, we find that there is sufficient incentive to utilize the accounting information in the short sale investment. In addition, the relationship between the future profit and the stock return is higher in companies with a high volume of short selling, suggesting that firms with higher volume of short selling would likely to reflect future earnings more accurately in the current stock return. Based on the prior research that short selling can be occurred when a professional investor expects to change the intrinsic value of firm, this study shows that the accounting information can be useful for investment decision. In addition, we also find that short-selling investors, who can be regarded as professional investors, predict the firm’s future returns more accurately, confirming that the empirical results of Drake et al. (2011) consistently apply in Korea stock market. Our results are consistent with the finding of Pownall and Simko (2005), which shows that firms with high short-sale volume have relatively high future earning-response coefficients, suggesting that short-selling investors have a role as information catalysts. We find that short selling investors play the role of information intermediaries in the capital market and provide a new insight on short selling to financial authorities and investors who still have differences perspectives in short selling transaction.

分散制御 시스템에서 開放化 構造說計

김내진,김진태,최진석 건국대학교 1996 대학원 학술논문집 Vol.43 No.-

최근 각종 제어시스템에 분산제어 시스템을 이용하는 경우가 늘고 있는데, 각 플랫폼에 따른 호환성 결여로 인하여 여러 가지 문제가 야기되고 있다. 본 논문에서는 이러한 어려움을 극복하기 위하여 사용 환경에 관계없이 각 분산제어 시스템을 연결하고자 개방구조를 설계하였다. 이를 위하여 OSI 7 layer model을 따른 protocal을 개발하였으며, 이것을 RPC와 XDR을 이용하여 구현하였다. 전체 시스템은 속도와 호환성을 모두 고려하였지만, 속도와 호환성이 모두 문제가 되는 것은 호환성을 위주로 설계하였다. Recently, many kind of control system is implemented by DCS(Distributed Control System). But that situation the compatible problem between different flatform system is arised. In this paper, we are about to describe the design of the system that makes a user to satisfy scalability, portablility, interoperability which is the characteristic of the open structure in DCS using real time control theory and microprocessor applicable technique. For this, we developed a protocal that followed OSI 7 layer model, and implemented this protocol using RPC and XDR. The system is considered the speed and the compatibility, but in the case of some problems in compatibility and speed, out design is intented to choose compatibility.

Organic Solar Cells: Solution‐Processable Reduced Graphene Oxide as a Novel Alternative to PEDOT:PSS Hole Transport Layers for Highly Efficient and Stable Polymer Solar Cells (Adv. Mater. 42/2011)

Yun, Jin‐,Mun,Yeo, Jun‐,Seok,Kim, Juhwan,Jeong, Hyung‐,Gu,Kim, Dong‐,Yu,Noh, Yong‐,Jin,Kim, Seok‐,Soon,Ku, Bon‐,Cheol,Na, Seok‐,In WILEY‐VCH Verlag 2011 Advanced Materials Vol.23 No.42

<P>Solution‐processable reduced graphene oxide as a hole‐transporting layer for highly efficient and stable organic solar cells is reported on page 4923 by Dong‐Yu Kim, Seok‐In Na, and co‐workers. Introduction of a newly reduced graphene oxide by simple solution processing into solar cells dramatically raises the cell efficiency and cell life‐time. The results will allow full use of chemically reduced graphene and will advance the realization of carbon‐based printable optoelectronic devices. </P>

주의력결핍 과잉행동장애 아동의 지적수준에 따른 정신병리와 실행기능의 차이

천은진,서완석,이종범,김진성,구본훈,송창진,성형모,배준용,배대석 大韓神經精神醫學會 2005 신경정신의학 Vol.44 No.4

To investigate psychopathoIogy and executive functions of attention deficit hyperactivity disorder (ADHD) children according to intelligence level, this study included 197 ADHD children who visited the outpatient department of neuropsychiatry of YeungNam University Medical Center, from July 2000 to June 2002. The children were divided into groups based on their intelligence levels. They were compared by the Personality Inventory for Children (PIC), Conncers' Continuous Performence Test (CPT), and Wisconsin Card Sorting Test (WCST). There were significant differences in PIC, on the subscales of verbal development, socialization and autism. In the CPT, there was no significant difference. In the WCST, there were significant differences in the total number of errors, the number of perseverative errors, the number of completed categories and the number of trials needed to complete the first category. Considering these results, the intelligence level of ADHD children is related to their disabilities and behavioral symptoms.Executive functions such as abstract thinking, categorization, working memory and flexibility had significant relationship to the intelligence levels of ADHD children. Therefore, the intelligence level of children with ADHD influences the higher executive functions of regulating attention and information processing rather than attentional functions and capacity alone.

지역사회 연계를 고려한 진주종합경기장 활용방안 연구

강석진(Kang, Seok-Jin),안재우(Ahn, Jae-Woo),김지희(Kim, Ji-Hee),이현진(Lee, Hyun-Jin) 대한건축학회 2013 대한건축학회 학술발표대회 논문집 Vol.33 No.2

淸華戰國簡『保訓』편의 연대와 성격

金錫珍(Kim Seok-jin) 동양사학회 2011 東洋史學硏究 Vol.116 No.-

An unknown Lost Books 古佚書, the Baoxun 保訓is the first publication among the so-called Tsinghua Bamboo Slips 淸華戰國簡. The contents and expressions of the Baoxun are similar with those of the so-called Shangshu kind 尙書類such as the transmitted Shangshu 尙書and Yizhoushu 逸周書. This simply leads many scholars to equate the text with the Shangshu kind. As for the composition date of the Baoxun, they have proposed various ideas ranging from the late Shang to the early Warring States period. However, these views seem to depend only on weak evidence such as the contemporaneity of some vocabularies and expressions with those of other texts, lacking the comprehensive analysis of various characteristics of the Baoxun. Accordingly, in the following three parts, I try to analyze the Baoxun in its philological significance. First, analyzing the text structure of the Baoxun from the perspective of Narratology, I first find its correspondence with those of the Shangshu kind. Especially, the similar narrative pattern between the Baoxun and “Guming” chapter of the Shangshu shows their probable connections. Based on the information from the Baoxun text, I further propose that the prime messages in the text would be the “cultivation to be a ruler” and the “principle of zhong” 中道. Second, analyzing the incidents and the key vocabularies in the Baoxun comparatively with the historical linguistics, I find that the base narratives in the text were from the popular stories of the Warring States period. Their core conceptual terms in turn shared with those of the Spring and Autumn and Warring States periods, especially in their implicative contexts. The major expressions and the syntax of the Baoxun further show that the text was created in the Classical Chinese of the Warring States period under the environment of solid literacy. Third, classifying the Baoxun and tracing its historical development, I finally situate the philological position of the text. Above all, I propose to classify the Baoxun not with the Shangshu kind, which must have been viewed from the Han perspective, but with the Shu kind書類under the very textual context of the Warring States period when the text was buried. Studying the historical development of the so-called Shu kind texts, I further correspond the Baoxun with those texts. Especially, its structural similarity with the “Taizi Jin” 太子晉of the Yizhoushu suggests that the Baoxun was a new text of the Shu kind created around the mid Warring States period. This finally leads me to propose with some reservations that the author of the text might be an intellectual (or a group) who had enthusiasm in the “cultivation to be a ruler” and “zhong.”