Zeolite X 촉매를 이용한 WO₃의 CO 환원-탄화반응

이동활,이종대,전진혁,박노국,류시옥,이태진 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.2

This study was performed to manufacture tungsten carbide from CO reduction- carburization of WO₃using zeolite-NaX catalyst. Zeolite-NaX catalyst could improve the reduction property of WO₃. Moreover, zeoite-HX and KX catalysts also improved the reduction property of WO₃. This improvement of reduction property leaded to the decrease of reaction temperature. The size of WC particle was 50∼60 nm at 650 ℃ for 10h. From these results, it is concluded that the various zeolite X catalysts could be used for the reduction-carburization of W0₃ as the catalysts.

위암과 식도암이 병발된 다발성 원발성 악성종양 1예

박사영,이나영,이효진,이선영,최진혁,이순남,심강섭,성순희,한운섭 梨花女子大學校 醫科大學 醫科學硏究所 1996 EMJ (Ewha medical journal) Vol.19 No.3

Multiple primary cancer means that more that two cancers occur independently in an individual. Recently, the incidence of multiple primary cancer has increased with lengthened survival, of cancer patients, development of new diagnostic technique and increased clinical evaluation. We report a patient who had adenocarcinoma of stomach combined with squamous cell carcinoma of esophagus simultaneously.

서울의 Penicillinase Producing Neisseria Gonorrhoeae 발생빈도(1994)

김재홍,안진균,정성재,김영태,김중환,김시영,이석종,이홍렬,서호석,김경훈,권혁진,정우권,고우석,이용석,안필수,오준규,오용섭 대한화학요법학회 1996 대한화학요법학회지 Vol.14 No.1

Background : In recent years gonorrhoea has been panendemic and remains one of the most common Sexually Transmitted Diseases in the world, especially in developing countries. Objective & Method : For the detection of a more effective therapeutic regimen and assessing the prevalence of Penicillinase Producing Neisseria Gonorrhoeae(PPNG), Ive have been trying to study the patients who have visited the VD Clinic of Choong-Ku Public Health Center in Seoul since 1980 by means of the chromogenic cephalosporin method. Results : In 1994, 168 strains of N. gonorrhoeae were isolated, among which 109 (64,9% ) were PPNG. Conclustion : Our results suggests that the prevalence of PPNG in Seoul is still increasing.

뇌자도 측정을 위한 저잡음 Nb SQUID 센서의 설계 및 제작

이용호,권혁찬,김진목,이상길,임청무,박용기,박종철 경북대학교 센서기술연구소 1998 센서技術學術大會論文集 Vol.9 No.1

We report on the design, fabrication and performances of a low-noise Nb SQUID sensor for neuromagnetic measurements. The main features of the developed sensor are i) large flux-to-voltage transfer, making the SQUID readout electronics simple, and ii) use of the integrated planar pickup coil to eliminate the environmental magnetic field noises. The magnetic field noise of the developed SQUID sensor is below 5 fT/√Hz at 100 Hz, which is low enough to be used in neuromagnetic measurements.

國有 自然休養林의 空間的 特性과 利用者 餘暇패턴 分析 : 京畿道 有明山·仲美山을 事例로

이혁진 경희대학교 문리과대학 지리학과 1998 地理學叢 Vol. No.

The purpose of this study is to analyze the characteristics of Mt. Yoomyung and Mt. Joongmi nationalized recreational forest by examining the geographic environment and recreational facilities and users' leisure patterns. Literature review, field survey and questionnaire method have been used. The questionnaires numbering 604 were collected from 2 areas. The major findings of this paper are summarized as follows. First, as a result of the field survey, Mt. Yoomyung and Mt. Joongmi belong to 'nationalized forest' according to the right of ownership. From the analysis of the geographic locations, there are relationships with mutual competition and cooperation between 2 areas. In regard to the area and recreational facilities, Mt. Yoomyung showed higher degree of quality than Mt. Joongmi. Second, as for users' residential distributions, study areas belong to 'the Seoul metropolitan circle type'. In the case of users' travel behaviors, the type accompanied with family or friends was the most plentiful. As for the stay period, '1 night 2 day' was the most important. Driving a car was ranked first in traffic modes. Most users spent about 2 hours from their residences to the forest. As for preferred seasons, the favorite one was summer. Next was autumn, spring and winter. Third, in the case of motivation of leisure activities, users tend to prefer 'forest recreation' and 'a rest/recreation'. As for the degree of users' participation, 'forest recreation', 'the sightseeing of physical landscape' and 'relaxation/a simple rest' were higher than 'the gathering and purchase of forest goods' and 'the use of facilities'. They were positively concerned with the mountain location and physical environment. Fourth, from the analysis of users' satisfaction concerning natural resources, users were satisfied with 'physical landscape'. As for the level of recreational facilities, the value of lodging facilities is much higher than that of any other facilities. But as the level of satisfaction, Mt. Yoomyung were higher than that of Mt. Joongmi. Based on the findings of this paper, the following suggestions can be made. First, as a result of the study that focused on 2 areas, there is a need to increase multipurpose spaces for use during 4 seasons in nationalized recreational forests of Korea. Second, the development and managemental plan of the nationalized recreational forest should be linked with not only the income source of nationalized economy but also the place of forest recreation. Thus what is needed is to increase functions of forest recreation and economic income by establishing various recreational facilities. Third, in the case of the nationalized recreational forest, advertising strategies by using various media are needed in order to improve the name value of this forest. Management of recreational facilities is needed in order to harmonize physical environment, conservation and recreational use.

PCA와 ANN을 이용한 VOC 측정기기 개발

이장훈,권혁구,박승호,김동진,홍철호 한국환경독성학회 2004 환경독성보건학회지 Vol.19 No.2

Air quality monitoring is a primary activity for industrial and social environment. The government identifies the pollutants that each industry must monitor. Especially, the VOCs(Volatile Organic Compounds), which are very harmful to human body and environment atmosphere, should be controlled under the government policy. However, the VOCs, which have not been confirmed in emission sources are very difficult to monitor. It is needed to develop the monitoring system that allow the continuous and in situ measurement of VOCs mixture in different environmental matrices. Gas chromatography and mass spectrometry are the most prevalent current techniques among those available for the analysis of VOCs. But, they need a large size analytical instrument, which costs a great deal for purchase and operation. In addition, it has some limitations for real time environmental monitoring such as location problems and slow processing time. Recently, several companies have commercialized a portable VOCs measurement systems, which cannot classify various kinds of VOCs but total quantities. We have developed a VOCs measurement system, which recognizes various kinds and quantities of VOCs, such as benzene, toluene, and xylene(BTX). Also, it can be used as a stand-alone type and/or fixed type in the vehicle with rack for real-time environmental monitoring.

寫眞을 이용한 캄보니아 앙코르 관광지의 이해

이혁진 한국사진지리학회 1997 한국사진지리학회지 Vol.5 No.1

Angkor, the cradle of Cambodian culture and ancient capital of the Angkor dynasty is located in the Northwestern part of Cambodia. In 1992 tourism areas :of Angkor was designated as one of cultural assets in the world. The purpose of this paper is to describe characteristics of cultural tourism areas in Angkor province using photograph. Their basic geographical and historical conditions have been analysed using literature review. The findings of this paper are summarized as follows. First, cultural remains in Angkor are composed of Roluos, Angkor Wat and Angkor Thorn, Preah Khan, and Banteay Srei areas. But Angkor is widely known as Angkor Wat and Angkor Thorn. Second, Angkor Wat is one of the most famous temples in Angkor and was constructed in the 12th century AD during the reign of King Suryavarman II. The temple is designed on the Hindu and Buddhistic concepts revolving around mountain Meru, the pivot of the world. The Sanctum sanctorum of Angkor Wat is situated at the top of the complex. The central Meru surrounded by 4 towers represents 4 cardinal directions raised high aboved 3 terraces. Religious continents are represented through enclosures separated by moats, symbolising the oceans. The temple has a powerful space to join the world of man to the world of the gods. Third, Angkor Thorn was built as fortified city wall by Jayavarman VII. This is composed of Angkor Thorn Gates, Bayon Temple and Terrace of the Elephants. Angkor Thorn is surrounded by 8m high wall containing 5 gates. Bayon is central temple of Angkor Thorn and Terrace of the Elephants is located in old royal palace destroyed by war. Enormous faces surrounded by 4 sides are carved on the 외 I Angkor Thorn Gates and many towers of Bayon. It was supposed that faces were sculptured after the model of the Goddess of Mercy or Jayavarman VII. Fourth, Angkor Wat and Angkor Thorn are living testimonies to ancient Khmer knowledge and skill, inspired by two great rulers. But Angkor wat and the other monuments in Angkor are examples of how vegetative growth and weathering can destroy monuments. The nearby temple of Ta Prohm, for example, is a frightening example of what could happen. These are the major hazards faced by ancient constructions and cultural tourism areas. Thus regular preventing of destruction by climate, vegetation, rain is essential. Finally, this paper is focused on description of characteristics of cultural tourism areas in Angkor. But from now the further studies on Cambodia shall be needed because it is important to propose fundamental data for students to research tourism fields and for tourists to travel this country.

LCD산업의 성과분석과 리더쉽 유지가능성에 대한 고찰

이정동,유진혁,임채윤,박성배 한국생산성학회 2001 生産性論集 Vol.15 No.2

Learning effect has implication for the performance analysis for the LCD industry which is highly process oriented and capital intensive industry. In this study, we estimate the learning parameter in that industry and investigate the difference in learning across generations. Based on the estimated learning effect, we provide some implication for the question whether the leadership in the industry is sustainable or not.

고수동굴의 관광특성과 개발에 관한 연구

이혁진,구경원 문화관광연구학회 2000 문화관광연구 Vol.2 No.4

The purpose of this study is to analyze the tourism characteristics of Gosu-Cavern by examining its tourism resources and tourists' behavioral patterns. Field work and questionnaires were administered after a review of literature. The questionnaires numbering 220 were collected from the study area. Major findings from the study show: Gosu-Cavern, one of the most popular limestone caverns of Korea, consists of a various speleothems: stalactite, stalagmite, column and flowstone; it is assumed to have been created about 450 million years ago; As for tourists' residential distributions, this area can be classified as the Seoul Metropolitan Circle and Danyang and Choongcheong type; The most frequent response on visiting type was the one accompanied by family and friends(65.4%); In regard to leigh of stay, a majority of respondents(82.3%) answered 'over 4 hours'. For means of transportation, around half the tourists(48.2%) used their cars; Satisfaction with its internal features was generally high(90.9%). Based on the findings, the following suggestions can be made; 1) natural caves such as Gosu-cavern offer not only National Cultural Assets but also useful leisure spaces for tourists. Accordingly, the continuous management of caves, establishment of internal facilities, and eventually the measures to harmonize their environments and the resources are required: 2) in the case of development of caves, advertising strategies by various media need to be developed in order to be well-known. For this, it is urgent to train the tour guides to explain in detail the mysterious features of the second formation of the caves. 3) in the cases of development of many tour courses, the cooperation between Danyang-gun and its close areas, along with the connection with any other caves and tourism resorts in this area should be considered.

비정형 기관지 유암종에 의한 이소성 ACTH 증후군 1례

이창훈,천남일,홍세인,정진욱,윤인석,조동혁,강호철,정동진,정민영 全南大醫大 2001 전남의대학술지 Vol.37 No.2