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김경찬,장대식 영남이공대학 1972 論文集 Vol.1 No.-
Structural members are frequently given profiles widening toward the endes to enable the members to better resist the negative bending moment prevailing at the joints, and design calculations are usually made on the assumption that they are of uniform section, ignoring the potential effect of variation in sectional demensions. This paper considers the extent of such effect and experimentally definess the limit of the size of some such thickening of sections within which such approximate design procedures may result with sufficient engineering practicability.
김경찬,정인호,구승모 한국농촌계획학회 2015 농촌계획 Vol.21 No.2
This study made use of 9 types of utilizing idle farmland deducted from existing research in order to examine cases by type of idle farmland, and selected representative cases by type after analyzing contents of 165 available newspaper articles. Selected Cases were assorted into agricultural use and nonagricultural use, and agricultural use are as followed. ①Community Service/Farming type is the case of Gimhae city reported on ‘Busan Ilbo’, ②High Income/Farming type is the case of cooperative unit of Geumjeong crude drug in Yeongam appeared in ‘Newsis’, and the case of Omija industry in Mungyeong reported on ‘Hankyoreh’, ③Tourism/Landscape/Farming type is the case of rape flowers and buckwheat flowers in Gupo village reported on ‘Asia News Agency’, ④Stock Raising/Farming type is the case of growing foraging crops published in ‘The Daejeon Ilbo’, ⑤Weekend farm type is the case of utilizing idle farmlands and creating weekend farm reported on ‘Mediawatch’, ⑥High income/Forest type is creating Mulberry cultivation areas in Hamyang-Gun published in ‘Yonhap News’, ⑦Ecology/Landscape/Forest type is forestation project of idle land reported on ‘Newsis’, ⑧Agricultural Experience Study type is the case of managing agricultural experience study center in Dosun elementary center published in ‘Sisajeju’ and the case of non-agricultural application case, ⑨Ecological Environment type is the case of wetland restoration of idle farmland in Gochang. This study investigated and arranged detailed contents by the literature search and interview investigation according to investigating items such as utilizing area, main agent, purpose, utilizing item, utilizing content, etc. by case. With that, it deducted implications as well as case characteristics, and finally suggested political proposals through the case analysis.
김경찬,문응규,이상수,구승모,이동근,손용훈 한국농촌계획학회 2017 농촌계획 Vol.23 No.3
This study started with drawing problems of early implementation and suggesting improvement plans in order to lead a rural convergence industrialization district system to early settlement and management for its policy goals. The study aimed at 13 districts that were designated from 2014 to 2016 for analyzing an actual condition of promoting early implementation, and went ahead with it combining literature research, interview survey and specialist opinion investigation. The study examined and organized an outline, policy goal, and actual condition of rural convergence industrialization district. Furthermore, it analyzed an actual condition of promoting at each stage such as designating processes of rural convergence industrialization districts, operating body and system, regulation improvement, district supporting projects and relating projects, drew problems and finally suggested improvement plans. This study could be meaningful because it is the first study to grasp an actual condition of promoting early implementation and to remedy problems in order to manage rural convergence industrialization district system which was newly promoted since 2014 for its policy goal. In addition, it suggests that the further study of the result after managing district system for a certain period of time should be needed.
시판되고 있는 까칠복 ( Fugu stictonotus ) 의 독성
김경찬,박진우,이명자,김상록,김동수,김현대,박영호 ( Kyung Chan Kim,Jin Woo Park,Myung Ja Lee,Sang Rok Kim,Dong Soo Kim,Hyun Dae Kim,Yeung Ho Park ) 한국수산과학회 1995 한국수산과학회지 Vol.28 No.1
Ten specimens (5 males and 5 females) of the pufferfish, Fugu stictonotus ($quot;Ggachilbog$quot;), were collected at a fish market of Pusan, Korea in july 1993, and examined for anatomical distribution of toxicity by mouse assay method. The frequency of toxic specimens was 40% for liver, 60% for ovary, 40% for skin and 60% for bile in female puffers. The highest toxicities were 107, 107, 29 and 93MU/g for liver, ovary, skin and bile, respectively; and average toxicity ±S.E, values were 14±11, 48±22, 4 ±3 and 12±9MU/g, respectively. The range of total toxicity was shown to be from 0 to 35,316MU. The characteristic pattern of toxin distribution observed on these specimens was exhibited; both muscle and testis were non-toxic, but others were weakly toxic. Also, there was significant difference for toxicity between male and female specimens.
자기-도핑형 poly(PEGMA-co-BF<sub>3</sub>LiMA) 전해질의 합성과 이온전도도에 대한 PEGMA분자량의 영향
김경찬,류상욱,Kim, Kyung-Chan,Ryu, Sang-Woog 한국전기화학회 2012 한국전기화학회지 Vol.15 No.4
분자량이 각각 300(PEGMA300) 및 1100(PEGMA1100) g $mol^{-1}$인 PEGMA와 합성된 $BF_3LiMA$ 리튬염을 이용하여 다양한 조성의 고분자전해질을 제조하고 전기화학적 특성을 평가하였다. 흥미롭게도 AC-impedance 측정법에 의한 상온 이온전도도는 분자량 $300g\;mol^{-1}$로 합성된 액체 고분자전해질에서 $8.54{\times}10^{-7}S\;cm^{-1}$의 값이 얻어진 반면, PEGMA1100으로 합성된 고체상태의 고분자전해질에서 최대 14배 이상 높은 $1.22{\times}10^{-5}S\;cm^{-1}$가 관찰되었다. 이러한 결과는 PEGMA에 ethylene oxide 단위가 5개인 $300g\;mol^{-1}$보다 23개인 $1100g\;mol^{-1}$에서 리튬이온의 배위가 쉽게 일어나기 때문으로 해석된다. 또한 양이온 수율 측정결과 리튬메탈과 $BF_3$간의 반응으로 인해 0.6의 비교적 낮은 값이 나왔지만 초기 3000초 동안에는 0.9 이상의 값이 관찰되어 단일이온 전도체의 특징을 보여주었다. Polymer electrolytes consisted of $BF_3LiMA$ and 300 (PEGMA300) or 1100 (PEGMA1100) g $mol^{-1}$ of PEGMA were prepared and the electrochemical properties were characterized. Interestingly, the AC-impedance measurement shows $1.22{\times}10^{-5}S\;cm^{-1}$ of room temperature ionic conductivity from PEGMA1100 based solid polymer electrolytes while $8.54{\times}10^{-7}S\;cm^{-1}$ was observed in PEGMA300 based liquid polymer electrolytes. The more suitable coordination between lithium ion and ethylene oxide (EO) unit might be the reason of higher ionic conductivity which can be possible in PEGMA1100 based electrolytes since it has 23 EO units in monomer. The lithium ion transference number was found to be 0.6 due to the side reactions between $BF_3$ and lithium metal expecially for longer time but 0.9 was observed within 3000 seconds of measuring time which is strong evidence of a single-ion conductor.
In<sub>x</sub>Ga<sub>1-X</sub>N/GaN 양자우물 구조의 수치 해석을 이용한 압전장 평가
김경찬,김태근 한국전기전자재료학회 2004 전기전자재료학회논문지 Vol.17 No.1
Piezoelectric fields built in I $n_{x}$G $a_1$$_{-x}$N/GaN (x=0.06∼0.1) quantum wells (QWs) have been estimated by comparing the transition energies, both calculated and measured by photoluminescence (PL). The calculation was numerically carried out with a rectangular QW model, where the effective bandgap considering a bowing facto, energy levels quantized for the lowest lying electrons and heavy holes (1e-lhh), and biaxial compressive strain were included except for the piezoelectric fields. The calculated values were observed to be larger (9∼15 meV) than the measured values by PL, which was considered to be caused by the piezoelectric fields built in InGaN/GaN QW interface. In addition, we observed the energy shift by measuring the EPDPL (excitation power-dependent PL), which was compared with the energy difference caused by the piezoelectric fields.
金炅燦 嶺南大學校 工業技術硏究所 1978 연구보고 Vol.6 No.1
An algorithm is developed which pinpoints the optimal type(s) and span proportioning that combine to minimize the total construction cost for a girder bridge of a substantial length at a given site. The algorithm comprises the following steps: 1. Costs of the superstructures are calculated for a set of test spans for each of the type options (j). Cost-span relations are traced and curve-fitted, thus: G(j)=f₁(L) L denotes single span(pier-to-pier) length. The relation is assumed quadratic. All the girder sections are optimized, using the formulas offered, prior to the calculation of G(j). 2. Costs of the piers are calculated for each of the type options (k) as related to the given types of girders (j). Cost-span relations are traced and curve-fitted. P(j,k)=f₂(L) which is assumed quadratic or linear. 3. Total costs are assembled, and optimal spans are determined that minimize the total costs. T(j,k)=nG(j)+mP(j,k)+Const=f(L) for dT/dL=0 n and m denote the number of spans and piers, respectively. 4. T(j,k)'s are calculated for all the conceivable combinations of (j,k) and corresponding L , and compared. A specific set of (j,k) is selected which corresponds to the smallest value of T. The is then entered into subroutines for girder (j) and pier (k) to produce final design and related details. All the calculations are programmed for computer processing. The algorithm contains formulas for the optimization of girder sections and span lengths theoretically derived with an extended number of factors considered. Test calcultions made to suit current design practice and code requirements attest to the validity of underlying assumptions and the utility of the formulas individually and the algorithm as a whole.
김경찬,김영민,정주영,김태권 한국광학회 1998 한국광학회지 Vol.9 No.4
분젠버너에서 당량비에 따른 연료부족, 적정, 과잉의 경우로 예혼합된 프로판-공기 화염에서 발생된 C2, CH, OH 라디칼의 농도형태 측정을 영상처리법을 이용하여 가시화하였다. 영상처리 시스템에서 협대역 통과필터, 영상증폭장치, CCD 및 PC를 사용하여 라디칼의 발광 파장대의 영상을 처리하였다. 영상처리 시스템을 통하여 화염에서 라디칼의 반응영역을 관찰하고, 라디칼의 농도분도를 예측할 수 있었다. 반응영역에서 각각의 라디칼의 공간적 분포는 CmHn 계열 화염의 반응 메카니즘을 이해할 수 있는 충분한 정보를 제공하였다. 이 정보로부터 C2 라디칼의 형광은 반응영역 앞부분에 먼저 나타나며 CH와 OH 라디칼의 형광은 화염의 하류부분에 분포함을 알 수 있었다. The Measurement of concentration patterns for $C_2$, CH and OH radicals in the premixed propane-air flame could be managed through an image processing technique. This technique was applied to the three kinds of flames on a bunsen burner-mixtures of fuel to be lean, optimum and excessive respectively. The image processing system was complished by treating single wavelength flame images around the eac radical luminescence band, which was obtained by using a set of narrow band pass filters, an image intensifier, CCD and PC. It was possible to observe and predict the reaction zone and the concentration distribution of the radicals, Spatial distribution of each radicals in the raaction zone gave us enough informations to analyze the reaction mechanisms in $C_mH_n$ combustion process. According to this informations, the image of $C_2$ radical exists at front zone, following the images of CH and OH radicals at downstream.
金炅燦 嶺南大學校 工業技術硏究所 1984 연구보고 Vol.12 No.1
Girder spacing in highway T-beam bridges may depend on various factors. When economy governs, it has been conceptionally noted that the wider the spacing, the more economy may be achieved. This paper derives from the comparative designs of highway T-beam bridges following the current AASHTO provisions a formula that gives a most economical girder spacing: B=W/(N-b) where B: Economical girder spacing, in meter W: Gross width of the bridge, in meter N: Number of girders, =4W/L+a, a=(W-9)/5 for DB24 and 18, (W-4)/5 for DB13.5 L: Span length in meter, between centers of supports b: =0. to 0.2; the smaller value gives the more economy.
道路橋標準圖의 解析과 最適設計代案 : (1)슬래브橋와 T빔橋 (1) Slab and T Girder Bridges
金炅燦 嶺南大學校 工業技術硏究所 1982 연구보고 Vol.10 No.2
To facilitate the designs and construction of the common types of highway girder bridge superstructures, the Ministry of Condtruction (MOC) has offered two series of standard plans, 1963 series and 1978 series. Both series are assumed to follow the pertinent specifications in force at the times of their issues and have been widely used by public and practicing engineers as given or with minor modificaions (such as to fit the variated widths). Many shortcomings are noted, however, in these plans, some obvious and some latent, such as non-conforming to the relevant specification requirements, inadequate in strength, over-conservative in details, and uneconomical. This paper analyzes these shortcomings and offers sets of optimized alternative plans which are free of the noted shortcomings, conform with the specification requirements and at the same time economical in construction costs. The alternative plans may be used as given or with modifications as the designers see fit.