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Zone Refining 에 의한 Bismuth의 정제
이용학,김병수,김창복,김병문 전북대학교 공업기술연구소 1991 工學硏究 Vol.22 No.-
1.5MHz, 7.5kW 고주파 유도로를 이용한 Bimtal의 zone refining 결과 다음과 같은 결론을 얻었다. 1) 적정 응고속도는 4cm/hr.이며 유효분배계수는 Ag=0.25, Pb= 0.36, Cu= 0.31 Ni= 0.46, Sb= 1.45이었다. 2) 초고순도 Bi를 얻기 위하여 통과시켜야 할 정제회수는, 가장 제거하기 어려운 Ni과 Sb함량에 따라 결정되며 다음과 같은 실험식을 따른다. 0.42_n6·Ni%+0.65_n6· Sb% < 0.0001% (n_*=5n_6₄, n_*=통과회수, n_6= 무한분배 차수) 3) L/ℓ= 5일때 최대정제회수는 5이며 그이상 증가하여도 이론적 정제치에 이르지 못하는 것은 역방향 확산 때문으로 생각된다. 4) 99.9%의 시료로서 시작하여 41회 통화후 중앙영역에서 metallic 성분에 대하여 99.9999%의 초고순도 Bismuth를 얻을 수 있었다.
투영법에 의한 여성 흡연 및 외제담배 브랜드에 대한 태도분석
이용학 수원대학교 1997 企業經營硏究 Vol.6 No.-
담배시장이 완전개방된지도 10년이 되어 외산담배의 시장점유율이 확산되고 있으며 이제는 소비자들도 국산·외산 별 구분없이 자유롭게 브랜드를 선택하는 경향이 일반화되고 있다. 또한 흡연도 성별차이가 없어지면서 여성흡연인구가 증가하는 추세이다. 본 논문은 이러한 시점에서 과연 소비자들이 국산과 외산담배를 차별적으로 인식하고 있으며 여성흡연에 대하여 어떠한 태도를 가지고 있는지를 만화를 이용한 투사법으로 실증분석하고 마케팅 시사점들을 제시하였다.
李容鶴,文學鎭 수원대학교 기업경영연구소 1992 企業經營硏究 Vol.1 No.-
Korean Aluminium Foil Industry has grown, during the last five years, as the average annul growth rate was 19.1%, But in the late 80's, with the new foil manufacturers participation, the already established manufacturers have worried over the increased production capacity. The industry is in a transitional stage changing from excess demand to excess supply. The study suggests the marketing strategy for the Korean Aluminium Foil industry as follows. First, the industry needs to reform its management from the reproduction emphasis to marketing emphasis. With the product surplus, the manufacturers have to sell to survive by the circulation of production -sales-reproduction. Second, through a marketing mix, the industry has to promote a new demand and enhance the marketability without pricing competitiveness. There has to be an effort to develop a new product, as well as enhancing the product quality. Third, aggressive export strategy has to be developed. And lastly, Green Marketing should be introduced into the Aluminium Foil industry.
승용차에 대한 가치 및 평가기준이 차종선택에 미치는 영향
이용학 한국상품학회 2004 商品學硏究 Vol.0 No.31
The main purpose of this study is to examine influences of the value & evaluative criteria about motor-car on the choice of car-types, and to contribute to be devised effective marketing strategies. In order to solve these research problem, a survey was conducted from Nov. 18-22, 2002. 680 female and male adults living in Seoul were abstracted by convenience sampling method. The results are as follows. First, the values about motor-car were classified as five factors. Those are named as "symbolism", "rationalism", "utilitarianism", "eco-friendly", and "instrumentalism". Second, evaluative criteria were classified as five factors. Those are named as "function", "design", "economic", "space", and "corporate image". Third, values were verified to influence on evaluative criteria. Fourth, values and evaluative criteria were verified to influence on the choice of car-types.
컴퓨터 모의실험을 이용한 Stop-and-wait ARQ 기법 성능 평가
이용학,이호준,최길용,장재신 인제대학교 2012 仁濟論叢 Vol.27 No.1
ARQ schemes are commonly used in various communication areas, for instance TCP protocol, to combat communication packet errors and there are three different types of ARQ protocol. In this paper, the performance of stop-and-wait ARQ scheme is evaluated with computer simulation and then compared with analytical results. Two different traffic generation modes are considered: the first one is the saturated traffic model and the other one is periodic arrival model based on exponential distribution. For performance measures, link utilization and average packet delay are used in this paper. According to numerical results, it is known that performance results from computer simulations coincide well with those by mathematical analysis. For the further study, we will continue to carry performance evaluations of two other ARQ schemes, go-back-N ARQ and selective repeat ARQ schemes.