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.

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.

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.

일 대학병원에 입원한 주요우울장애의 증상 특성

이진,김상훈,김학렬,박상학,황걸,장혁진 朝鮮大學校 附設 醫學硏究所 2008 The Medical Journal of Chosun University Vol.33 No.2

Objectives: The purpose of this study was to investigate the frequency and kinds of symptoms and the profile of depressive symptoms and somatic symptoms of admitted patients with major depressive disorder in a university hospital. Methods: The study was cross-sectional study in Chosun university hospital. A total of 299 patients who met the diagnostic criteria of major depressive disorder according to DSM-IV were participated in this study. Forty four item questionnaires were developed to check symptoms and the questionnaires checked from patient's medical record. Results: Common depressive symptoms were the following order: depressive mood (55.2%), initial insomnia (52.8%), anxious/tense (47.8%), tired/no energy (35.1%), suicidal ideation (28.8%). Common somatic symptoms were the following order: decreased appetite (33.1%), headache (22.1%). gastric discomfort (16.7%), palpitation (15.4%), chest discomfort (11.4%). Comparing depressive symptoms and somatic symptoms in terms of gender, anxious/tense, emotional/cry a lot, decreased appetite, gastric discomfort, palpitation, were more frequent in female patients (p<0.05), On the other hand, interpersonal sensitivity, pessimism were more frequent in male patients (p<0.05). Elderly depressed patients showed hypochondriasis symptom more frequently than younger patients (p<0.05). Conclusion: These results suggested that the depressive symptoms showed dissimilar in character according to the gender and age. Therefore proper diagnostic and therapeutic approaches will be needed for each patient's symptom characteristics.

Sol-gel법을 이용한 미세공 실리카 세라믹의 기공구조 변화에 관한 연구

이진휘,연만형,정은정,박노혁 서울産業大學校 1996 논문집 Vol.43 No.1

솔-젤법에 의하여 제조된 미세공 실리카 세라믹에 대하여 N₂-adsorption isotherm 및 TEM에 의하여 기공구조 변화를 조사하였다. Group 1, 2 및 3의 경우 물의 양이 각각 11, 5.5 및 3.8mole까지는 급격히 surface area의 증가를 보이다가 그 이후에는 완만한 상승을 보이는데, 이것은 앞의 실험에서 보인[4.5]gelation time 및 FT-IR의 실험결과와 일치하는 것이다. 서로 다른 물의 양에 대하여 BET surface area와 Cumulative surface area의 차이가 Group 1서 Group 3으로 옮아감에 따라 커지는 것은 용매의 양은 감소하는 반면 TEOS의 양 증가로 인하여 물과 TEOS의 반응이 원활하지 못한 결과로 덜 발달된 polymer에 기인한 작은 particle에 의하여 형성된 작은 기공들에 기인한 것으로 사료된다. 이와같은 기공구조는 TEM의 결과에 의하여 확인할 수 있다. Group A에서 E쪽으로 갈수록 물의 양의 증가에 기인하여 surface area는 증가하며, Group a에서 d쪽으로 갈수록 물의 양의 감소에 기인하여 surface area는 감소한다. N₂-adsorption isotherm and TEM were used to investigate the micro-porous silica ceramic prepared by sol-gel process to find the structural changes of pores. In the case of Group 1, 2 and 3, the drift of the surface area increased steeply till the amount of water 11, 5.5 and 3.8 moles individually and after that showed increased smoothly. It is the same results as the gelation time and the FT-IR[4.5]. It is the reason that the differences of BET and Cumulative surface area become larger proportionally as moving from Group 3 that the reaction of water and TEOS is less active, caused by using decreased quantity of water but increased TEOS, and therefore the smaller pores by the smaller particles were formed. It was identified by TEM. The surface area is increased by the increased water as moving from Group A to Group E, and decreased by the decreased water as moving from a to e.

초기의 수신증 환자의 요로폐쇄 진단에 있어 Tc-99m MAG3 신장 스캔시 실질통과지연 소견의 유용성

이원우,문대혁,김재승,류진숙,이희경 대한핵의학회 2002 핵의학 분자영상 Vol.36 No.5

목적: 신우 확장이 심하지 않은 상부 요로 폐쇄 환자는 신우의 순응도가 낮아 이뇨신장스캔에서 위음성으로 나올 수 있다. 실질통과지연이 이뇨신장스캔 위음성을 감별해 내는 유용한 소견이 될 가능성이 있다. 저자들은 일측성 요로폐쇄가 의심되는 성인 환자들을 대상으로 Tc-99m MAG3 신장스캔을 실시하였을 때 이뇨신장스캔과 실질통과지연의 폐쇄진단 능력을 비교해 보았다. 대상 및 방법: 일측성 요로폐쇄가 의심되어 Tc-99m MAG3 이뇨신장스캔을 실시한 54명(남:여=30:24, 나이 40.7±15.5세)이 대상 환자군이었다. 이뇨신장스캔의 폐쇄 양성에 대한 진단기준은 T_(1/2)>15분 이었고, 반대측 정상신장에 비해 신우에 방사능이 늦게 나타나고 실질에 방사능 저류가 현저할 때 실질통과지연이 있다고 하였다. 수신증의 정도는 1∼2분 배설기 영상에서 수신증이 있는 신장대 반대편 신장의 면적 비로 구하였다. 폐쇄의 최종 진단은 중재시술 후에 수신증이 호전될 때 혹은 중재시술을 하지 않은 경우는 수신증이 악화될 때였다. 폐쇄 없음으로 정의한 경우는 6개월이상 추적하였을 때 수신증이 변화 없을 때였다. 결과: 26예는 폐쇄가 있었고 28예는 폐쇄가 없었다. 이뇨신장스캔과 실질통과지연의 민감도는 각각 69% (18/26) 와 50% (13/26)이었고 이뇨신장스캔으로 위음성을 보였던 2예의 폐쇄를 실질통과지연으로 더 찾을 수 있었으며 이들은 신장 면적 비가 1.1미만이었다. 이뇨신장스캔 혹은 실질통과지연으로 폐쇄를 진단할 수 있었던 20예 중 실질통과지연이 있었던 13예는 실질통과지연이 없었던 7예보다 신장 면적 비가 유의하게 작았으나(0.97±0.20 vs 1.30±0.41, p<0.05) 상대신기능은 차이가 없었다. 특이도는 실질통과지연이 100% (28/28)이고 이뇨신장스캔은 89% (25/28)이었다. 결론: Tc-99m MAG3 스캔에서 실질통과지연은 신우 확장 정도가 심하지 않은 요로폐쇄에서 이뇨신장스캔이 위음성인 경우의 요로폐쇄 진단에 도움이 될 수 있다. Purpose: Diuretic renography (DR) can be false negative in patients with upper urinary tract obstruction due to low compliance of the renal pelvis. Delayed parenchymal transit (DPT) may be a valuable sign in case of false negative DR. We compared the diagnostic values of DR and DPT during Tc-99m MAG3 diuretic scan in adults with suspected unilateral obstructive uropathy. Materials and Methods: Fifty-four patients (male:female=30:24, age: 40.7 15.5 yrs) who underwent Tc-99m MAG3 diuretic scan due to suspicious unilateral obstructive uropathy were analyzed. DR with a T_(1/2) of > 15 min was considered as positive for obstruction. DPT was considered to be present when there was delayed appearance of radioactivity in the renal pelvis and prolonged retention of radioactivity in the renal parenchyma. The renal area ratios was defined as the ratic of pixel number of hydronephrotic kidney over that of normal contralateral at 1∼2 min images. Definition of obstruction was improved hydronephrosis after intervention, or aggravated hydronephrosis without intervention. Non-obstruction was defined as unchanged hydronephrosis over 6 months. Results: Twenty-six renal units had obstruction and 28 no obstruction. The sensitivities of DR and DPT were 69% (18/26) and 50% (13/26) respectively. Two renal units with DPT but negative DR showed the renal area ratio of <1.1. Among the 20 obstructive renal units with DPT or positive DR, 13 with DPT had lower renal area ratio than 7 renal units without DPT (0.97±0.20 vs 1.30=0.41, p<0.05). Differential renal function was not significantly different between these groups. DPT correctly diagnosed all renal units with non-obstruction (specificity 100%), while the specificity of DR was 89% (25/28). Conclusion: DPT during Tc-99m MAG3 diuretic scan may be a valuable sign in diagnosing urinary obstruction especially in patients with false negative DR and early HN. (Korean J Nucl Med 2002;36:306-13)

대전 장태산 자연휴양림의 관광특성에 관한 연구

이혁진 문화관광연구학회 2001 문화관광연구 Vol.3 No.2

The purpose of this study is to analyze the tourism characteristics of Mt. Jangtae recreational forest by examining its geographical environment, recreational facilities and tourists' behavioral patterns. Field work and questionnaires were administered after a review of literature. The major findings from the study shows: as a result of field survey, Mt. Jangtae, one of the most popular private forests in Korea, consists of a various recreational facilities; As for tourists' residential distributions, this area can be classified as Daejeon and Choongnam type; in the case of their travel behaviors, the most frequent response on visiting type was the one accompanied by family and friends; for means of transportation, a majority of respondents used their cars; for preferred seasons, the favorite one was summer. Next was spring, fall and winter; satisfaction with its tourism resources and facilities was generally high. Based on the findings, the following suggestions can be made; 1) the development and managemental plan of private forest such as Mt. Jangtae should be linked with not only individual income but also useful space for public welfare and outdoor recreation. Accordingly, the continuous establishment of internal recreational facilities to increase functions of forest recreation and owners' economic income are required: 2) in the case of the specialization of private forest, advertising strategies by various media need to be developed in order to be well-known. Reasonable management in order to harmonize environmental conservation and resource use should be considered.

급성 심근경색증을 동반한 혈전성 혈소판 감소성 자반증 1예

이태희,김진혁,김완중,박지영,강흥선,조정휘,김권삼,송정상,배종화 대한순환기학회 2003 Korean Circulation Journal Vol.33 No.11