• Journal of Advanced Marine Engineering and Technology
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• 제6권1호
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• pp.34-40
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• 1982

The characteristics of typical 17 kinds of fuel oils are studied to fine the calculation formulae for the required amount of air and the combustion gas amount. 1) The author's calculation formulae are as follows; (1) Theoretically required amount of air (2) Theoretical amount of combustion gas 2) Theoretical amount of the required air in combustion and combustion gas of fuel oils are always estimated less with Rosin's formula than with author's one. 3) Theoretical amount of the required air and the amount of combustion gas of fuel oils are more reasonable with author's formula than Rosin's one in comparison with results of actual analysis.

• 한국유기농업학회지
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• 제20권4호
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• pp.543-561
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• 2012

This work is for reasonable valuation method of environmental-friendly and organic company. Reasonable valuation method is principal for the sound development, the reasonable investment and the growth of stock market. This study proposes valid valuation and method for environmental-friendly and organic company. The author selected 4 companies from certificate list of environmental-friendly and organic food and LOHAS (Lifestyles Of Health And Sustainability) food of Korean standards association. Applying financial audit report of 5 years, the author output 5 variables from each companies by using Growth Option model of Real Option model. And the author valuated companies by adding option value calculated with these variables and residual value discounted with cash flow discounted method. Company values from ROV model were 1.71 time higher than DCF model. This results show that the value of environmental-friendly and organic food company may own high option premium, that is the growth factor.

• 한국수학교육학회지시리즈C:초등수학교육
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• 제14권1호
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• pp.57-67
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• 2011

이 연구에서는 진정한 '수학수업'의 맥락에서 수학퍼즐을 어떤 방법으로, 어떤 관점에서 제시할 것인지 논의하였다. 우선, 수학퍼즐의 일반적인 특징을 추출하고 수업 안팎에서의 다양한 활용을 조사하였다. 둘째로, 수학퍼즐을 의미 있게 전달하기 위한 수업방법을 논의하였다. 셋째로, 수학퍼즐을 어떠한 관점에서 다룰 것인지를 논의하였다. 마지막으로, 수학 퍼즐을 통한 수업은 학생들에게뿐 아니라 교사들에게도 '수학에 있어서의 여유'를 경험하게 해 준다는 점에 그 중요한 가치가 있음을 지적하였다.

• 치과방사선
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• 제14권1호
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• pp.163-168
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• 1984

The author observed a case of the malignant fibrous histiocytoma of the mandible in 23 aged male patient, who had come to the Infirmary of Dental College, Yonsei University. With the help of careful analysis of radioraphic and clinicopathologic findings, the author had obtained the results as follows. 1. Lesion occured at 22 years of age. 2. Traumatic history or other special predisposing factors were not seen. 3. Lesion appeared as a intra osseous primary tumor not showing any metastatic change. 4. The author have concluded this disease as a malignant fibrous histiocytoma of the mandible according to serial findings.

• The Korean Journal of Pain
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• 제8권2호
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• pp.225-234
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• 1995

Low back pain(LBP) is one of the most common ailment. There were two type of LBP in the clinic. One of them is low back pain with leg pain, the other one is low back pain without leg pain. Author explain the reasons, characters. mechanism, diagnosis, and reported 156 cases of LBP. There are various method to treatment of low back pain in recent. The first selection for treatment of LBP were intervertebral block added "+" type block(IVP "+" TB). according to author's experience, the rate of Excellent and good were account for 96.2%. Other method of LBPO therapy were also used in Pain clinic, such as psoas compartment block, caudal block, epidural steroid block, zygapophysial joint block, nerve root block, subarachnoid neural block, Lumbar sympathetic block, etc. Finally, author introduced Pain clinic in China. divided to three titles: (1) history, (2) CASP and scientific activity, (3) pain therapy in China.

• 한국GIS학회:학술대회논문집
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• 한국GIS학회 2004년도 GIS/RS 공동 춘계학술대회 논문집
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• pp.455-461
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• 2004

Now, GPS survey is used on equipment from leisure to precise geodetic survey and nation admits the result of GPS survey. When surveyors perform precise GPS survey, they use post processing method but they greatly use real time processing method to consider field status. Especially, when surveyors measure the result of moving target, they use real time GPS survey to the best method. For this study, the author precisely surveyed distance of ship launching from shipyard on real time using real time precise GPS method. In this paper, the author compares and examines the accuracy of first real time precise GPS survey method nationally and the capability on use. And the author performed real time precise GPS survey in NOKBONG and 21C shipyard positioning at GEOJEDO.

• 아동학회지
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• 제23권4호
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• pp.105-118
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• 2002

Nonfiction as a genre of children's literature is distinguished from fiction by emphasis. In fiction the story is central, and in nonfiction the facts are central, but the nonfiction writer needs to find a way to create his or her own personal vision for the book to be more than a mere collection of facts. Nonfiction has often used fictional elements to present data : it re-creates believable characters, discovers plot lines, establishes points of view, describes settings and presents carefully designed illustrations. Sometimes the author's worldview is revealed in nonfiction writing. For example, in Orbis Pictus(l657), John Amos Comenius based his writing on a Christian worldview and created text and pictures as a device to teach students the world God created.

• 대한치과보철학회지
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• 제18권1호
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• pp.87-97
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• 1980

To compare the castability of various alloys popularly used in Korea for porcelain-fused-to-metal restorations, author selected Degudent G as precious alloy, J.P. 92 as semiprecious alloy and Vera Bond, Rexillium III, Unit Bond, Fine Bond as non precious alloys. With nylon lines and gauge waxes, author made the wax patterns for the castability comparison test. In the same conditions, wax patterns were invested, burned out and cast. Author obtained the following results from this study. 1. The castability of Degudent G as precious alloy for porcelain-fused-to-metal crown and bridge was the best of all. 2. The castability of nonprecious alloys was less than Degudent G as precious alloy, but their differences were not large. 3. The castability of Rexillium III is the best of all nonprecious alloys and that of Vera Bond, Unit Bond had nearly the same results. 4. Semiprecious alloy (J.P. 92) was less castable than nonprecious alloys.

• 한국표면공학회지
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• 제8권1호
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• pp.15-23
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• 1975

Electrodeposition of metals form aqueous solutions (eg, electroplating ) is frequently accompanied, by the discharge of hydrogen ions(in acidic solutions) or water molecules ( in alkaline electrolytes). The atomic hydrogen produced thus may partly diffuse into the interior of the substrate and when this is absorbed by iron/steel substrate, it has detrimental effects on the mechanical properties of the steel, leading to ahydrogen embrittlement. Steels, particularly the high strength steels, are prone to hydrogen embrittlement. In view of the increasing applications of high strength steels in variousindustries, particularly in the aircraft manufacture, there has been renewed interest in the studiesonhydrogen embrittlement during electroplating of metals. In this review, the author summarizes the reports on hydrogen embrittlement during preplating of metals. In this review , the author sumamrizes the hydrogen embrittlement during electroplating of metals. In this review , the author summarizes the reports on hydrogen embrittlement during preplating operations and electroplating of metals like copper, nickel, tin, zinc ,cadimum and chromium. Finally, the effect of degassing by baking to deembrittle the plated high tensile steels and mechanism of hydrogen embrittlement are briefly indicated.

• 한국전자통신학회논문지
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• 제17권1호
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• pp.85-90
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• 2022

본 연구에서는 소비자의 부하를 반영하여 실시간 전력품질을 평가할 수 있도록 하는 방법을 개발하였다. 이를 위하여 전력품질 상태를 [Ideal], [Measured], [Acceptable]로 분류하고, Ideal AHP를 사용하여 측정값이 어느 정도인지를 평가할 수 있도록 하였으며, 소비자 부하특성을 반영할 수 있도록 부하를 저항부하, 전동기부하, 전자제품부하로 분류하고 부하의 특성을 반영한 전력품질을 평가할 수 있도록 하였다. 향후, 1:1 행렬과 관련한 심도 있는 연구를 진행하고, 연간단위의 전력품질과 통합하여 종합적인 전력품질 평가를 할 계획이다.