폐주물사의 용융공정에서의 물질 및 에너지 수지의 해석

정원섭,민동준,윤수종 ( Won Sub Chung,Dong Jun Min,Su Jong Yoon ) 한국주조공학회 1995 한국주조공학회지 Vol.15 No.5

N/A A computer simulation model of various smelting process for melting waste sand was developed by using energy and material balance concept. This model can predict the coal, flux and oxygen consumption and the volume and temperature of off-gas. The major critical variables for smelting process can be explained by using the analysis of energy and material balance. The major conclusions were as follows; 1. The most important variables for smelting process were high post-combustion ratio, high heat transfer efficiency and refractory protection technology. 2. For saving energy in this smelting process, selection of raw materials i.e coal, flux are very important, espacially using of low volatile coal is very profitable. 3. The treatment cost of waste sand is high and environmental restriction is severe, in this reason we must be concerned in the treatment of waste sand by smelting process.

벤처.중소기업의 외국인지분이 배당수익률에 미치는 영향에 대한 연구

정원섭,Chung, Won Sub 한국벤처창업학회 2014 벤처창업연구 Vol.9 No.5

외국인 투자의 증가가 국내기업의 배당에 미치는 영향에 대하여 선행연구에서 상이한 결과들을 제시하고 있는데 이는 실증분석의 방법에서 배당을 측정하는 변수로 상이한 변수들이 사용되었으며, 분석 방법론 측면에서 외국인투자와 배당수준 간의 인과관계의 방향을 통제하지 않았다는 것이다. 본 연구에서는 기존문헌들이 가지는 한계점을 최대한 보완하여 코스닥시장 신규상장기업을 대상으로 하여 외국인 투자와 배당수준간의 인과관계의 방향성 문제를 극복하고 배당수익률을 종속변수로 하여 분석함으로써 앞에서 제기한 우려에 대한 답을 제시하고자 하였다. 먼저 전체표본을 사용하는 경우, 배당수익률은 외국인투자와 유의한 관계를 보이지 않았으며 이와 같은 결과는 기존 문헌의 연구결과와 유사한 것이다. 그리고 외국인투자가 발생하기 이전에 배당금을 지급했던 표본기업을 대상으로 한 패널분석에서도 외국인 투자가 배당수익률에 유의하게 영향을 미치지 않은 것으로 나타났다. 이는 외국인 투자자들이 배당을 지급하는 기업에 대한 선호현상으로 인하여 외국인투자는 배당수준에 영향을 미치지 않았음을 보여주는 결과이다. 그러나 외국인 투자가 발생하기 이전에 배당을 지급했던 기업을 제외한 표본에 대한 패널분석결과에 의하면 외국인투자는 배당수준 변수 즉 배당수익률이 유의하게 정의 관계에 있는 것으로 나타났다. 이는 배당을 지급하는 기업에 대한 외국인 투자자의 선호현상을 통제하는 경우, 외국인 투자자들이 국내 코스닥기업에 배당수준에 대하여 유의한 영향을 미친다는 결과를 보여주는 것이다. 특히 기존의 연구에서 유의하게 나타나지 않았던 배당수익률이 외국인의 배당지급 기업에 대한 선호현상을 통제하였을 때 유의하게 나타난 본 연구의 결과는 상당히 의미가 있는 것으로 볼 수 있다. 이는 외국인지분이 증가 할수록 전체이익 중 배당액이 차지하는 비중이 증가하고 시기총액대비 현금배당이 증가함을 의미함으로 외국인투자자가 단기적 이익에 집착하여 고배당을 유도한다는 주장이 성립하는 것으로 볼 수 있다. This study supplements the limitation as much as possible that existing literatures have, and, on the target of new registered businesses to KOSDAQ, this study presents answers to the worries raised earlier by recovering problems on causal relationship direction between foreigner investment and dividend level and by analyzing them with dividend level as an independent variable. First, with the whole samples used, dividend income rate didn't show significant relationship with foreigners' investments. It is similar to study result of the existing literature. A panel analysis, on the target of sample businesses that paid dividends before foreigners' investments originated, showed that foreigners' investments didn't have a significant effect on dividend rate. It means that foreigner investors don't have an effect on dividend level. But, a panel analysis of samples shows that foreigner investments have a significant thesis relationship with dividend level variable, that is dividend return rate, except the businesses which paid dividend before foreigners' investments originated. It means that in case foreign investors' preference is controlled, in the businesses which pay dividends, foreign investors have a significant effect on dividend level to native KOSDAQ. Especially, this study result is very significant, for it shows that dividend return rate, insignificant in existing studies, was significant when foreigners' preferences to the businesses which pay dividends was controlled. It means that the more foreigners' shares increase, the more relative importance of dividend out of all profits increases, compared with all of the amounts at the time, and that foreign investors stick to short-term profit and induce big dividend.

Zr-V-Mn-Ni계 라브스상 합금의 미세 구조와 전기 화학적 특성

정치규(Chi Gyu Jeong),한동수(Dong Soo Han),정원섭(Won Sub Chung),김인곤(In Gon Kim),김원백(Won Baek Kim) 한국수소및신에너지학회 1997 한국수소 및 신에너지학회논문집 Vol.8 No.3

ZrV_0.1Mn_0.7Ni_1.2 alloy ingot (bulk alloy) made by the arc melting was found to be consisting of mostly of ZrV_0.2Mn_0.98Ni_1.04 matrix alloy and ZrV_0.01Mn_0.13Ni_1.2 2nd phase alloy. The former alloy had the form of the C15 type Laves alloy structure and the latter one had the intermetallic compound structure of Zr₉sNi₁₁. In order to investigate the effect of these two phases on the electrochemical charge-discharge characteristics of bulk ZrV_0.1Mn_0.7Ni_1.2 alloy, the matrix and the 2nd phase alloys were fabricated separately by arc melting method and their electrochemical characteristics were studied and compared with the bulk alloy. It was found that the discharge capacity was the lowest of 160 mAh/g in the 2nd phase alloy. The matrix alloy exhibited 200 mAh/g. Both were lower than that of the bulk alloy of 250 mAh/g. The matrix and the bulk alloys showed a similar properties in the activation stage, the high rate dischargeability and the self discharge characteristics. Also a signigicant capacity decrease was observed after activation in both alloys. Whereas the 2nd phase alloy showed the very different characteristics. This alloy was found to be difficult to activate. However the capacity was remained constant after the activation. Also the self discharge rate was seen to be better than those of the matrix and the bulk alloys.

기계적/전기화학적 표면처리가 알루미늄-에폭시의 접합강도 향상에 미치는 영향

정원섭(Won-Sub Chung),김도형(Do-Hyung Kim) 한국표면공학회 2016 한국표면공학회지 Vol.49 No.6

Low melting metals are difficult to weld because it is vaporized. But epoxy resin make bonding possible using low melting material and dismissal materials. This study is to improve the bonding strength of epoxy and substrate by mechanical and electrochemical methods. In case of mechanical work, bonding strength is 17.6㎫ and in case of pre-work, bonding strength is 15.3㎫. When anodizing and mechanical work is applied, bonding strength is 25.3㎫ is increased 165%. When anodizing is applied, bonding strength is 27.6㎫.

Bi₂O₃를 첨가한 8M KOH용액에서 다결정 Ag전극의 전기화학적 거동

허태욱,공영경,정원섭,Hur, Tae-Uk,Kong, Yeong-Kyung,Chung, Won-Sub 한국전기화학회 2005 한국전기화학회지 Vol.8 No.1

The electrochemical behaviors of polycrystalline silver electrodes in 8M KOH solutions containing $Bi_2O_3$ were studied under various conditions by cyclic voltammetry, potentiostatic and galvanostatic techniques as well as the morphology of the silver oxide structures by SEM. It was found that three new compounds comprising silver, bismuth, and oxygen as well as $Bi_2O_3$, $Ag_2O$ and AgO were formed during the electrochemical oxidation of silver. In addition, the potentiostatic current transients were characterized by the appearances of the first current peaks corresponding to the formation of silver oxides, and the second current peaks corresponding to the Ag-Bi-O compounds, indicating the presence of the nucleation and 3D growth mechanism, in the potential regions of $Ag_2O$ and AgO, respectively. Microscopic examinations showed that two types of silver (I) oxide morphologies are formed in the potential region of $Ag_2O$.

Prevention of Discoloration of Precious Metal Silver

Chung, Won-Sub(정원섭),Ahn, Sun-Joo(안선주) 부산대학교 문화유산보존연구소 2018 한국전통복식연구소 학술심포지움 Vol.2018 No.1

귀금속 은의 변색 방지 연구

정원섭(Chung, Won-Sub),안선주(Ahn, Sun-Joo) 부산대학교 문화유산보존연구소 2018 한국전통복식연구소 학술심포지움 Vol.2018 No.1

코스닥 IPO 기업(企業)에 대한 외국인투자의 보증효과에 대한 실증연구(實證硏究)

정원섭 ( Won Sub Chung ),최문수 ( Mun Soo Choi ) 대한설비관리학회 2012 대한설비관리학회지 Vol.17 No.1

The purpose of this paper is to examine the certification effect for investments by foreign investors. The certification effect hypothesis is originated from the market for IPOs and suggests that a third party who is more active and more prestigious in the capital market can certify the quality of initial public offerings and thus reduce their underpricing. Foreign investors have accumulate valuable reputation capital through repeated successful investments and interactions in Korean capital markets. Thus they will restrain themselves from investing low-quality firms and increase the market value of those firms. This paper empirically examines this certification effect through testing the relationship between the foreign investment and the firm value. The results indicate that foreign investors indeed enhance the efficiency and transparency of management and thereby increase the market value of firms.

벤처,중소기업 코스닥 신규등록의 배당금지급과 벤처캐피탈 투자유치가 신규공모주 가치평가에 미치는 영향에 대한 연구

정원섭 ( Won Sub Chung ) 대한설비관리학회 2012 대한설비관리학회지 Vol.17 No.4

This paper examines the effects of the dividend payment and the certification of venture capital on the underpricing of shares of IPO firms listed in the KOSDAQ markets. The payment of dividends has been known to reduce the information asymmetry about the quality of firms and increase the value of firms with dividends. This result is supported by the information content and signalling hypotheses of the dividend payment and the certification effect of venture capital. Our empirical results show that IPO shares with dividend payments and venture capital investments were less underpriced than IPO shares without dividend payments and venture capital investments. Their difference is also statistically significant. This paper suggests that the payment of dividend and venture capital investment have indeed the information content and the effects of certification and signal the quality of firms to the market, resulting in the reduction of underpricing of IPO shares.

전기로 분진과 압연 Scale의 환원 및 탄화거동

황호순,정우창,정원섭,정원배,Hwang Ho-Sun,Chung Uoo-Chang,Chung Won-Sub,Chung Won-Bae 한국자원리싸이클링학회 2003 資源 리싸이클링 Vol.12 No.5

전기로에서 발생하는 분진과 압연스케일의 재활용을 위하여 전기로의 철원과 열원을 동시에 사용할 수 있는 탄화철 제조가 필요하다. 이를 위한 기초 자료를 확보하기 위하여 전기로 분진과 압연스케일의 환원거동과 탄화 거동을 조사하였다. $650^{\circ}C$ 이하의 온도에서 일산화탄소 100%로 탄화를 시키면 유리탄소는 생성되지 않으면서 세멘타이트보다 탄소함량이 더 높은 탄화철(약 9wt% C)을 생성할 수 있었다. 전기로 분진의 환원에 필요한 탄재의 양은 이론 탄재양의 약 1.2배, 그리고 환원온도는 $900^{\circ}C$가 가장 적당하였다. 압연 스케일의 환원온도는 $1000^{\circ}C$가 가장 적당하였다. 전기로 분진 및 압연 스케일의 탄화속도는 압연 스케일의 경우가 모두 빠르게 나타났다. 그리고 슈퍼탄화철의 성분은 대부분 $Fe_2$C이었다. To be recycled iron and heat source in EAF, EAF dust and mill scale generated from steelmaking plant should be made to iron carbide. Behavior of reduction and carburization in EAF dust and mill scale is studied to get fundamental data. EAF dust and mill scale are carburized at $650^{\circ}C$ by 100% CO gas. The carbon content of iron carbide(about 9 wt,% C) is higher than that of cementite without free carbon. The 1.2 times of calculated carbon content is suitable for reduction of EAF dust. The reduction temperature is appropriate to $900^{\circ}C$ in EAF dust and $1000^{\circ}C$ in mill scale. The carburization rate of mill scale are faster than those of EAF dust. The composition of super iron carbide is almost $Fe_2$C.