「사수고점박(沙隨古占駁)」

정약용 ( Yag Yong Cheong ),장정욱 ( Jang Jeong Wook ) 다산학술문화재단 2005 다산학 Vol.- No.6

Ch`eng jiong(程逈: 沙隨, 南宋人)`s The old divination method of the Yijing(周易古占法) is based on Shao K`ang-chieh(邵康節)`s Theory of Antedates Heaven(先天論), and make reference to divinations of Ch`un-ch`iu Tso-chuan(春秋左傳) and Guoyu(國語), however his explication is very wrong, now I try to refute. 1. Ch`eng jiong(程逈): T`ai-chi(太極, the Supreme Ultimate) have no direction and no body, such is spirit(神) and principle(理). Cheong yong(丁鏞)`s refutation: T`ai-chi in the Yijing is nothing but an imitation of the Universe. 2. Ch`eng jiong: Two Symbols(兩儀) are the first lines of C`ien(乾) and K`un(坤), three counts(三變) of Da yan(大衍). Four images(四象), in the same manner, are the first and second lines of C`ien and K`un, six counts(六變) of Da yan. Cheong yong`s refutation: Liang yi(兩儀) is two symbols, not two properties. Four images are an imitation of four seasons. 3. Ch`eng jiong: The eight primary trigrams(八卦) are three lines of C`ien and K`un, nine counts(九變) of Da yan. The hexagram(重卦) is mixed double with eight primary trigrams. Cheong yong`s refutation: It is difficult to understand how such a baseless fiction could have arisen. The eight primary trigrams are eight emblem.

Fusulinids and Depositional Conditions of the Marine Sediment (Carboniferous) of the Yong-weol Coalfield, Korea

鄭昌熙(Chang Hi Cheong),朴龍安(Yong Ahn Park) 대한지질학회 1977 지질학회지 Vol.13 No.3

EMAT의 유도초음파 비틀림 모드를 이용한 가압중수로 피더관의 균열 검출

정용무,김상수,이동훈,정현규 한국비파괴검사학회 2004 한국비파괴검사학회지 Vol.24 No.2

배관에서의 균열 탐지를 위해서 비틀림 모두 유도초음파 검사법을 적용하였다. 배관에서 비틀림 모드의 생성 및 수신을 위하여 배열형 전자기음향 탐촉자 (EMAT, electromagnetic acoustic transducer)를 설계, 제작하였다. 직경 2.5 인치의 배관에 대해 주파수 200kHz의 비틀림 모드 유도초음파를 적용하였으며 가진용으로 4개의 배열형 EMAT를 제작하였으며, 별도의 수신용 EMAT를 설계 제작하였다. 실제 중수로 피더관 mock-up에 대해 곡관부에 다양한 깊이의 인공 결함을 가공한 뒤 약 2m 거리에서 각각의 탐지능을 실험하였다. 결함 깊이가 관 두께 대비 5% 인 경우에도 결함 신호를 탐지할 수 있었으나 결함의 깊이와 신호 진폭과의 관계성은 나타나지 않았다. A torsional guided wave mode was applied to detect a crack in a pipe. An array of electromagnetic acoustic transducer (EMAT) that can generate and receive torsional guided ultrasound with the frequency of 200 kHz was designed and fabricated for testing a pipe of 2.5 inch diameter. Artificial notches with various depths were fabricated in a bent feeder pipe mock-up and the detectability was examined from the distance of 2 in of the specimen. The axial notches with the depth of 5% of wall thickness were successfully detected by a torsional mode (T(0,l)) generated by the EMAT. However, it was found that the depth of defects was not related to the signal amplitude.

EMAT의 유도초음파 비틀림 모드를 이용한 피더관의 균열 검출

정용무,김상수,이동훈,정현규 한국비파괴검사학회 2004 학술대회 논문집 Vol.- No.-

A torsional guided wave mode was applied to detect a crack in a pipe. An array of electromagnetic acoustic transducer (EMAT) that can generate and receive torsional guided ultrasound with the frequency of 200 kHz was designed and fabricated for testing a pipe of 2.5 inch diameter. Artificial notches with various depths were fabricated in a bent feeder pipe mock-up and the detectability was examined from the distance of 2 m of the specimen. The axial notches with the depth of 5% of wall thickness were successfully detected by a torsional mode (T(0,l)) generated by the EMAT. However, it was found that the depth of defects was not related to the signal amplitude.

樹木의 大氣淨化能力 評價法에 關한 硏究

鄭龍文 공주대학교산업개발연구소 2000 産業開發硏究 Vol.8 No.-

As air pollutants caused by cars and plants increase seriously in large cities and industrial complex, importance of open space is growing steadly. Air pollutants, such as SO_(2), NO_(X) and O_(3), destroyed the chloroplast tissue, cartinoide and protein, plants died. Trees, which absorb and settle air pollutants through photosynthesis, must be evaluated the amount by quantitative method. This study has presented evaluation fomulas in order to evaluate purification ability to absorb and settle air pollutants by trees, through literature collection.

자연휴양림의 개발 방향에 관한 연구

정용문 韓國實科敎育硏究學會 2000 實科敎育硏究 Vol.6 No.1

This study was carried out in order to establish the desirable preparation ways of the natural recreational forests in Korea. Data were collected by questionaire from 118 studedts of 2nd grade in Cheong-Yang Agri- Industrial High School, Kong-Ju Agricultural High School, Seo-San Agri-Industrial High School, and Chun-An Agricultural High School in Chung Nam province from April to May, 1996. The results obtained were as follows; 1. Out of 118 respondents, 60.2% lived in an utban area which is begger than Myun desteicts, 38.2% lived in a rural district. 2. As for their recognition about naturol recreational forests, the majority of respondents were ignorant of the term of natural recreational forests, and existence of the natural recreational forest in their neighborhood. 3. As for the media of their recognition about natural recreational forest, their friends and acquaintance were the most important, and public information of Forest administration or local autonomous entity were the least important. 4. About the necessity to preparation of natural recreational forests, the majority of them responded positively. 5. As for their opinions about the most necessary facilities is 30.5%, physical training facilities is 11.9%, and education facilities is 2.5%, respectively. 6. As for their frequency to use the recreational forests, the majority of respondents showed reactions that they will visit there once or twice a month.

산화막 피복 원전 연료봉에서 A₁원주파의 전파 특성 해석과 실험적 검증

정용무,정현규,이정권,주영상 韓國非破壞檢査學會 1999 한국비파괴검사학회지 Vol.19 No.3

산화막이 피복된 원전 연료봉의 원통형 쉘에 대한 공명산란 해석을 수행하고 원주파 전파 특성을 연구하였다. 피복 쉘에 대한 산란 음압의 정규 모우드 해를 구하였고 최근에 새롭게 제안된 고유 배경음압 계수를 이용하여 피복 쉘의 순수 공명 신호를 분리하였다. 12%의 상대 두께를 갖는 원통형 피복 셀에 대하여 산화막 두께 증가에 따른 공명 원주파의 전파 특성을 해석하였다. 산화막의 존재와 그 두께가 증가할 때 정규 모우드의 차수에 따라 원주파의 전파 특성이 크게 변화한다. 제1창 반대칭(A₁)원주파에서 특정 부문파의 위상속도는 산화막이 존재하고 그 두께가 증가함에도 불구하고 위상속도가 일정한 특성을 보인다. 공명신호를 분리하고 공명 모우드를 확인하는 실험을 수행하여 A₁원주파의 전파 특성을 확인하였다. A₁원주파의 위상속도 일정 특성을 이용함으로써 산화막의 두께를 상대적으로 측정할 수 있는 새로운 비파괴 평가 방법을 제안하였다. The resonance scattering of acoustic waves from the cylindrical shells of nuclear fuel rods coated with oxide layers has been theoretically modeled and numerically analyzed for the propagation characteristics of the circumferential waves. The normal mode solutions of the scattering pressure of the coated shells have been obtained. The pure resonance components have been isolated using the newly proposed inherent background coefficients. The propagation characteristics of resonant circumferential waves for the shells coated with oxide layers are affected by the presence and the thickness of an oxide layer. The characteristics have been experimentally confirmed through the method of isolation and identification of resonances. The change of the phase velocity of the A₁circumferential wave mode for the coated shell is negligible at the specified partial waves in spite of the presence of the oxide layer and the increase in coating thickness. Utilizing the invariability characteristics of the phase velocity of the A₁mode, the oxide layer thickness of the coated shells can be estimated. A new nondestructive technique for the relative measurement of the coating thickness of coated shells has been proposed.

日本 오가사와라諸島 國立公園의 植生復元에 關한 硏究

蔡洙天,鄭龍文 公州大學校 資源科學硏究所 1998 資源科學硏究論文集 Vol.6 No.-

In order to restore the vegetation that was demolished by imported goats in Ogasawara Islands, the damaged States in Mukogima, Nakoudogima, Yomegima and Nishigima island that were badly damaged among Ogasawara Islands were investigated, and the removal method of goats, the counterplan for restoration of vegetation and restoration technique for vegetation were inquired. The results obtained are as follows; 1. The temperature and amount of pricipitation of the yearly mean in Ogasawara were 23℃ and 1229.1mm respectively, and this Islands were belonged to the oceanic subtropical zone. 2. The main vegetation in four island were Pisonia umbellifera,Callicarpa subpubescens, Ochrosia nakaiana, Livistonia chinensis, Drypetes integerrima, Pandanus boninensis, Terenna subsessilis, Sporobolus diander, Oplismenus compositus, Gramineae spp. etc. 3. The vegetation and top soil in four islands were extinct by eating and over-walks of goats and severely washed out by rainfall and wind. 4. The number of goats were increased yearly, and were 766 in Mukogima, 189 in Nakoudogoma, 92 in Yomegima and 41 in Nishigima in 1997, respectively. 5. To control goats and to restore the vegetation, the fence was set up in the place was badly damaged by goats. 6. Within the fence to control goats, sand bag method to soil erosion, small dam, vegetation mat method and seed spray method were treated with.

人工酸性雨에 對한 몇 闊葉樹種의 耐性에 關한 硏究(Ⅱ)

鄭龍文 公州大學校 産業開發硏究所 1995 産業開發硏究 Vol.3 No.-

Simulated acid rain was treated on a year old seedlings of 4 borad-leafed species (Ligustrum obtusifolium, Gleditsia japonica, Betula platyphylla, Magnolia obovata) which had been treated on seed sowing by same simulated acid rain last year, to examine the resistance of trees to the simulated acid rain. Tree height, dry weight, T-R ratio and nutrient contents in leaves were measured and compared among the treatments. The results obtained in this study were as follows ; 1. Decreasing the pH levels of simulated acid rain, tree height and dry wieght of 4 grees were decreased. But T-R ration was increased in 4 trees as the pH levels of simulated acid rain decreased. 2. T.N, P?O?, K?O, CaO and MgO contents in leaves were decreased in 4 species as the pH levels of simualted acid rain decreased, but fulfur contents inleaves were highly increased by acid rain. 3. Among 4 borad0leafed species used in two years study, Ligustrum obtusifolium shoed relative resistant tree to simulated acid rain. And the resistances of Magnolia obovata and Glesitsia japonica were intermediate, but Betula platyphylla was very susceptible to simulated acid rain.

도시공원 내 인공습지 도입을 위한 소생태계 사계 연구

鄭龍文,朴眞英 공주대학교산업개발연구소 2000 産業開發硏究 Vol.8 No.-

This study is presented the improvement techniques of artificial wetland, one of micro-ecosystem developed to promote bio-diversity in urban areas, through studies of problem in cases. To this end, based on instances found in broad and importance which is development method of ecological park, wetland and micro-ecosystem at cases was proved the effect of techniques. There was no monitoring result and biological lacking about biological form in urban areas in korea. But this study selected the subject which it built up until the present time and it was presumes development possibility site. So this study showed techniques to promote bio-diversity. Key result of this study are as follows. (1) There is the problem of the living environment for creatures. The artificial embankment is necessary to various water depths and considering of the living of aquatic life. It is an important factor for the ability of activity place and prevention of soil erosion for activities of aquatic insects and young fish as well as the growth of aquatic plants. Therefore, as create of the embankment must considering that form of embankment, various grade, soil stability, food-plant and as well as the plant by water to clean . (2) It is necessary for making observation way to protection. Recently, this problem must consider because of ecological park stand out in bold relief. As a result, the ecological park must accept many people to use. Therefore, nature get damaged. Until now, cases are developed deck and way for observation too accessible. So a soil environment has been change for the worse and caused soil compaction. It was menaced the living environment for creature. Therefore, suitable pattern of observation way and areas for protection through the control should be consider to protect of living environment for creatures. (3) Cases presented is lack model of living environment for creature. In such a case of a forward nation, there is studying about ecological model to promote bio-diversity even detailed part. To example, stone-constructed, to placement a log, to built of a grass-roofed house(a small cottage), it is induce a micro-living thing by create porous environment. Therefore, we must continually study for allurement a living thing at the place-constructed in urban areas. (4) Environment education program's development are more earnest are urgent. It is most important works. Therefore, study have to going afterward. The present state of artificial wetland and eco-pond were not development of program. So it is raise the problem. Environment education by placement of guide map or book and a volunteer in the field is a practice way of a narrow means. Also development program is urgent to aware important of environment and development program and training for environmental specialist have to preceding. As a result of development method groping should be sponsored education of special and efficacious.