조선해양 스마트 기술 트렌드와 신뢰성 플랫폼

김영기,이태현,김용진,조유희,류경하,김영기,이태현,김용진,조유희,류경하 한국신뢰성학회 2025 한국신뢰성학회 학술대회논문집 Vol.2025 No.11

비-스플라인에 의한 복합 자유 곡면의 구현에 관하여

金榮基 울산과학대학 1991 연구논문집 Vol.16 No.-

본 논문에서는 해석적 함수로 표현할 수 없는 자유곡면으로 구성되는 2차원 물체를 형상모델링 함에 있어서 중요한 역할을 하는 비-스플라인 이론의 유용성을 고찰하고 바스키와 그린버그의 알고리즘을 이용하여 쌍3차 비-스플라인 곡면의 정으로부터 복합자유곡면을 구현하였다. In this paper, the usefulness of B-spline theory that plays an important role in geometric modeling for three dimensional objects which are composed of free surface that can not be represented by analytic function have been examined and the composite surface have been implemented by the algorithm of Barsky and Greenberg using the definition of bicubic B-spline surface.

PCM을 利用한 에너지 저장에 關한 硏究

金永基,李濬,宋熙烈 건국대학교 1984 學術誌 Vol.28 No.2

本 硏究는 PCM混合物의 life cycle에 관한 熱特性과 수직 Annulus PCM 熱交換器의 內側으로 흐르는 傳熱流體의 流量 및 流入溫度 變化에 따른 PCM의 溶融效果 및 傳熱特性에 관한 實驗으로, PCM으로 Glauber's salt를 選定하고, thickner로 Celite를 添加하여 PCM 混合物의 沈降分離防止實驗을 遂行하였으며, 傳熱流體의 流量 及 流入溫度를 變化시켜, PCM, Tube Wall 및 流體溫度를 測定하여, 溶融 PCM이 熱을 吸收時, melting time과 heat flux의 關係를 考察하였다. 實驗結果 PCM 混合物은 70.5wt%의 Glauber's salt에 thickner로 0.25wt%의 Celite를 添加時 沈降 현상을 나타내지 않았다. 傳熱流體의 流量이 일정할 때, melting time은 流體의 流入溫度에 대해 log-log 座標에서 2.45의 기울기로 감소하였고, 傳熱流體의 流入溫度가 일정할 때, melting time은 流體의 流量變化에 대해 log-log 座標에서 0.56의 기울기로 감소하였다. 또한 流體의 流入溫度가 melting time에 미치는 영향은 流量變化에 의한 경우보다 相對的으로 현저하였다. This is concerned with study on the life cycle of PCM mixture and on the melting effect and heat transfer characteristics of PCM with variation of massflowrate and inlet temperature of heat transfer fluid flowing inside the vertical annulus PCM heat exchanger. Glauber's salt was used as PCM and separation experiment of precipitation for PCM mixture was done by addition of celite as thickner. The PCM, tube wall, and fluid temperature were measured by the change of fluid massflowrate and fluid inlet temperature, and correlation between the melting time and heat flux were discussed when melting PCM absorbs heat. Experimental results show that PCM mixture containing 10.5 weight percent of Glauber's salt and 0.25 weight percent of celite as thickner has no precipitation phenomenon. And also, when the fluid massflowrate is constant, the melting time of PCM was decreased to the fluid temperature with the slope of 2.45 in the log-log coordinate. The fluid temperature constant, melting time was decreased to the fluid massflowrate with the slope of 0.56 in the log-log coordinate. The influence of fluid temperature on the melting time is relatively remarkable than that of fluid massflowrate.

製版用 感光性 樹脂 材料에 關한 考察(Ⅰ)

金永基 건국대학교 1975 工大硏究報 Vol.5 No.1

計量調整型 샘플링檢査 硏究 : MIL-STD-414에 對하여 MIL-STD-414

金永基 忠州大學校 1987 한국교통대학교 논문집 Vol.20 No.2

This is the primary study of lot-by-lot sampling inspection by variables (MIL-STD-414). I devided this study into four parts. Part 1 is the outline of four sections in the variables standard (MIL-STD-414), namely : Section A-General Descroption of Sampling Plans : Section B-Variability Unknown-Standard Deviation Method : Section C-Variability Unknown-Range Method : Section D-Variability known. Part 2 is the mathematic study on estimates of the percent defective and operating characteristic curves. Part 3 is the study of sampling inspection process and example using MIL-STD-414. Finally, part 4 is the study for normal, tightened, reduced inspection and conversion example using MIL-STD-414.

이익 관리의 서론적 고찰

김영기 忠州大學校 1971 한국교통대학교 논문집 Vol.4 No.2

Profit management has boon watched recently with interest as a inportant problem of management. Top management must make synthetic business policy as supreme decision makers of business. This business policy is necessary to make Short-term and long-term planning for profit-gaining. There fore, profit management is realization of above-men-tioned business policy and it means top-management control for profit-gaining. In this report, I maked clear introduction to profit management and indicated inportant points of problems. I tried to be aguide to studies in profit management. There are the main points of these considerations on the articles as follow: I. Profit management is all -round method of management by using break-even point that is culcuated in mutual relations of cost, sales revenue(output), profit. So. profit management Covers the whole activities of sales, manufacture, Finance-department. II. Utilization of break- even point is not only indispensable to make profit-planning, but we must consider economical use of input-capital, adjustment of finance-economical and financial fluidity for profit-planning.

Se 蒸着膜의 光電導 特性

金永基,신영진,李龍浩,李亨宰 全北大學校 1970 論文集 Vol.12 No.-

The complexity of photoconduction of electrostatistically corona charged amorphous selenium films is caused by a variety of factors. Of all these, the effects of base elec rodes and the kind of charge on films on the voltage decay characteristics are investigated here for the use of xerography. Dark decay could be descrived farely well by setting a simplified model in which the sample construction is considered as a condenser with leakage. The dark decay resistivity obtained from the equation,ρ=1(ε_0ε)(-d/dt·logv)^-1 ranges 10^13to10^16Ω-cm in positive charge decay, and has ∼10^16Ω-cm in negative charge. In photo-decay, the voltage ef corona charged Se films discharges logarithmically with time as anticipated from the expressions, log V=log10-(2J-(eBμτ/(ε_0εdx)loge)t_L and [dv/dt](_t=0)=(eJD)/(ε_0ε)[exp(-d/xμτ_Rv_0)](μτ_Tv_0/d^2)[1-exp(-d^2/μτ_Tv_0)] This experiment shows much more rapid voltage decay in negatively charged films than in positively charged ones, on the contray to the data already obtained by others. The negative charge decay shows almost the same speed in both base electrodes of Al and Cu. Al base electrode, however, was found to have caused the positive charge decay to have steeper voltage-time curve.

現代 社會學의 動向과 韓國社會學의 問題

金泳起 全北大學校 文科大學 學徒護國團 1981 全北人文 Vol.2 No.-

非晶質 Chalcogenide 薄膜의 電氣傳導

김영기,이형재,정길환 全北大學校 文理科大學 1976 論文集 Vol.4 No.-

The Ⅰ-Ⅴ, characteristics in high electric fields have been investigated on vitreous As-Te-Ge films prepared by vacuum evaporation. The characteristics are analysed in terms of space-charge-limited current, Poole-Frenkel effect, and small-polaron mechanism. A simple SCLC model does not appear to explain the conduction properties. The other two mechanisms show good agreements with our experimental results. From these agreements, acceptor-like localized states are assumed to exist in the band gap. The field-assisted-thermal emission of electrons from the localized states in the valence band tail into the assumed states in the gap is likely to explain the electrical properties. Small activation energy E=0ㆍ43ev(Ⅰ~exp(E-/kT)) compared with optical absorption edge E_opt=1ㆍ34ev gives the evidence that the amorphous material cannot be treated as a simple intrinsic semiconducor.

이제는 ‘노경관계’ 시대

김영기 한국융합경영학회 2021 융합경영리뷰 Vol.21 No.-