연소반응을 이용한 TiO₂초미립자 제조 공정에 대한 이론적 연구

채범산,김교선 江原大學校 産業技術硏究所 1997 産業技術硏究 Vol.17 No.-

A numerical model has been proposed for a diffusion flame reactor to manufacture ultrafine TiO₂powders. The model equations such as mass balance equation, the 0th 1st, and 2nd moment equations of aerosols were considered. The phenomena such as TiCl₄reaction rate, TiO₂nucleation rate and the coagulation of TiO₂powders were included in the serosol dynamic equation. It is found that the TiO₂particle concentration becomes higher, as the ilet TiCl₄ concentration and the total gas flow rate increase, and also as the flame temperature decreases. The TiO₂particle size increases, as the flame temperature and the inlet TiCl₄concentration increase and the total gas flow rate decreases.

Spent Caustic 폐수에 포함된 sulfate의 생물학적 저해작용

이우범,추진욱,정채훈 國立 麗水大學校 환경문제硏究所 2001 環境硏究論文集 Vol.4 No.-

This study was conducted to set up operating criteria such as rational mixing ratio and critical concentrations of sulfate in biological treatment process when the abnormal conditions of the plants broke out. To assess the inhibition effects of influent of Spent Caustic wastewater on the biological treatability, a series of batch reactor test and respirometry study were conducted. Respirometer were employed to evaluate the biological treatability and inhibition effect of sulfate on wastewater generated from each process of petrochemical industry. It can be suggested that the optimum mixing ratio(caustic tank effluent : influent of aeration tank) should be below 10% in order for the biological inhibition effects be reduced, and the critical concentration of sulfate causing the inhibition effect in biological treatment process was 5800mg/l.

우리나라 現行 財務狀態變動表의 有用性에 관한 實證的 檢證

朴範鎬,蔡奎學,孫 敏,李 悠,吳瑗善,全夏成 홍익대학교 경영연구소 1988 경영연구 Vol.12 No.-

지역균형개발을 위한 문화관광권의 투자 자원 배분 연구

임범종,최승국,임재영 문화관광연구학회 2001 문화관광연구 Vol.3 No.2

By the result of critical analysis based on the Multi-Regional IO Model for the whole country that divided into 8 boundaries of land, the whole national demand in tourism showed the 34.2% of increase by the impacts of tourism investment on regional economic growth. However it also analysed that the economical gap between the regions through these investment showed more broaden and wider than before. Accordingly in order to mollify the economical gap between the regions but with the encouragement of product increase, the policy scenario on the distribution of investment resource had designed effectively for the analysis per each scenario. In consequence of this policy analysis, all of the scenario showed that it had mollified the economical gap between the regions comparing to the tourism investment of 7 culture tourism belts.

外國籍企業의 會計報告制度에 관한 硏究

朴範鎬,申東洙,蔡奎學,李均,金喆中 弘益大學校 1983 弘大論叢 Vol.15 No.1

In Accounting, a new problematic field has been recognized with the development and changes in industrialized society. An accounting system of a multinational corporation emerged from different accounting environments between one country and another. This environment can be summarized as follows; (1) Accounting measurement that affect financial position and management performance of an accounting entity are made by foreign currency, not by domestic currency or reporting currency of a parent company. (2) The exchange rate is not fixed, but fluctuating. (3) In case the foreign business activity is conducted by the foreign entity, separated from the parent company at home, the enterprise activity is done under entirely different circumstances. Such environmental changes in their fundamental effects upon accounting differentiate the meaning of a accounting measurement. Accounting reports by heterogeneous measurements has diminished in informative worth of accounting measurements because there are not secured comparability. Thus, as far as possible, accounting reports should be integrated to one financial statements, identically combined from different home and foreign accounting measurements. The reason that problems of accounting reports of multinational corporation has emerged into a new problematic field is to develop the theory and method to identify different accounting measurements. This paper is to suggest more reasonable directions of reporting system of accounting for multinational corporation, and to explore theoretical foundations of aaccounting report by clarifying the basic problems and characteristics of accounting standards of some countries and their reporting practices. For this purpose, this paper focuses on the discussion of the main subject as follows; (1) The sources and characters of the problems of accounting reports that emerged by the nature and characteristic activities of multinational corporation. (2) Analysis of some country's current accounting standards and reporting practices of multinational corporation. (3) More reasonable model building for accounting report with a view of external and internal management reports.

物價水準變動과 外貨換算

朴範鎬,蔡奎學 홍익대학교 경영연구소 1983 경영연구 Vol.7 No.-

Double scanning 방식을 적용한 X-ray video converter 개발

이채욱,문병현,오신범 大邱大學校 科學技術硏究所 1999 科學技術硏究 Vol.6 No.1

With the rapid development of medical technology, the digital radiological imaging techniques, such as CT, MRI, PET, CR and X-ray, have been widely used. The demand of medical image storage and noiseless signal requires good video converter system. In this paper we develop a new x-ray video converter using double sunning method. This converter can simplify the monitoring system and improve the image enhancement.

우리나라 物價變動會計制度의 導入方案에 관한 硏究

朴範鎬,宋在萬,李勉榮,蔡奎學 홍익대학교 경영연구소 1985 경영연구 Vol.9 No.-

As accounting is an outgrowth of society, we can say that the accounting system of each country is derived from its economic situation and from the people's outlook no economic values. Thus when the economic situation of one country is different from that of another country, and the outlook of the people of one country is different from that of another country, they the accounting system for changing prices as well as general accounting systems may be different. Actually accounting systems of different countries are not identical. The writers of this paper try to find an accounting system for changing prices suitable to out country. The writers review various theories on accounting systems for changing prices, survey accounting systems of various countries and basic patterns of such systems, and in vestigate the actual conditions of our country in order to provide accounting information which reflects the effect of changing prices and to give a practicable accounting system. In this paper, the writers state their opinions about accounting systems for changing prices as follows: 1)The demand for the publication of accounting information about the effect of changing prices upon the financial status and operational result of a business is a world-wide trend. Considering that our industries are now aiming at opening a capital market, we should establich an accounting system for changing prices in order to follow the world-wide current. 2) As we intend to follow the world-wide current, to get useful accounting information, and to get a practicable accounting system, the most suitable system for us is the current value accounting system The current value accounting system mentioned here does not provide information supplementary to that of the financial statements based on the historical cost but it provides a substitute of the current value financial statements for those based on the historical cost. Financial statements based on current values are standard statements. 3) In our country, there are no active studies or discussions on the accounting systems for changing prices. We need to set up an organization entirely responsible for the establishment of a desirable accounting system for changing prices, responsible for the establishment of guidelines for putting the system to use, and responsible for the coordination of the interests of those concerned.

개질재를 혼입한 재생아스콘의 역학적 특성에 관한 실험적 연구

박승범,조광연,조청휘,김정환,채용주 충남대학교 산업기술연구소 2000 산업기술연구논문집 Vol.15 No.1

This paper presents the results of an experimental study on the mechanical properties of modified recycling asphalt concrete. Research has been performed to obtain the characteristics of the modified recycling asphalt concrete such as marshall test, indirect tensile test, resilient modulus and wheel tracking test by varying contents of modifier (SBS, SBR) and recycled aggregate(30, 50, 70%). Modified recycling asphalt concrete showed better performance than new asphalt concrete in dynamic stability. Each quality property of the modified recycling asphalt concrete satisfied requirement of pavement construction specification.

울산공항의 항공기 운항에 따른 기상요소 분석

허성일,오신범,이채욱 대구대학교 과학기술연구소 2001 科學技術硏究 Vol.8 No.1

This paper identifies aircraft operations of Ulsan airport, analyzes factors for cause through weather elements, and explores the application of weather minima according to the directions of runway. Directions of the runway at Ulsan Airport consist of one, 18-36. The wind distribution is characterized by a northerly (N) wind direction that coincides with the runway direction (head and tail winds) while a southwesterly (SW) wind direction acts as a cross wind with the runway direction as a reference, requiring caution when an aircraft lands and takes off. The least visibility is prominent from May to June. In addition, due to topographical characteristics of the area, visibility obstruction from dense fog is frequent with the occurrence of radiation fog. But the effects of sea fog are almost non-existent. The analysis of weather elements at Ulsan according to aircraft operations is based on a fact that lowest weather minima have been set for run%vay, along with landing and take-off methods.