• 한국유기농업학회지
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• 제15권2호
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• pp.151-169
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• 2007

By the environment-friendly(hereafter EF) agricultural policy and toward the safety food of consumers, there is much glowing supply and demand fur EF agricultural products, in Korea. But, in general, EF agricultural products are blown as unique, unreasonable and high price system. This study aims to make clare the main bodies and competition structure in EF agricultural products and the different from the agricultural products. The mail results of this study are summarized as follows. Firstly, farmers and consumers directly participate in the distribution, and the major distributors participate in the market of EF agricultural products after the certification system is got ready. Because EF agricultural products is not dealt and the price system is not built up in agricultural wholesale market. Secondly, the distribution route of EF agricultural products is organized the unified organization by the main bodies such as farmers, consumers co-op, and special distributors. In any step of distribution, the main body of distribution surely deals with the contracted farmers, consumers co-op, and special distributors. Accordingly, it is said that EF agricultural products has the competition structure between the distribution route organized the unified organization rather than between main bodies in the each steps of distribution.

• 자원환경지질
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• 제5권3호
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• pp.145-150
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• 1972

This report is written for presenting a principal theme of study about. the origin of Sangdong ore deposit in details, being an aid to find new ore bodies, on the basis of mineralogical charactor and geological feature. Main vein in Sandgong mine has characteristic zonal distribution and localization of minerals. 3 kinds of minerals, that are quartz, hornblende, diopside, form systematically their each rich zones. Other minerals like plagioclase, native bismuth, sphene, molybdenite and wolframite are developed locally. According to the zonal distribution and localization of the minerals, the authors presume that mineralizing agents which changed interbedded limestones into ore bodies act and come up from non-exposed igneous body in the direction perpendicular to the platy main vein. That non-exposed igneous body, presumed, might be extended from the exposed igneous bodies in the southern part of Sangdong mine.

• 대한기관식도과학회지
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• 제3권1호
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• pp.84-93
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• 1997

The bronchoscopy is usually performed in the patients who present symptoms of wheezing, hemoptysis, signs of airway obstruction, unexplained long-term chronic cough with or without radiologic features of pneumonia, emphysema or atelectasis. The symptoms and signs of cases of suspected airway foreign body are of often cofused with those of asthma pneumonia and other respiratory tract disease. The ventilating bronchoscopy will be helpful for removal of certain foreign bodies as well as alleviating medically-unresponsive bronchopulmonary conditions via removing abnormal secretions or merely improving ventilation. The authors have performed clinical analysis of 59 patients who were suspected of airway foreign bodies and treated by ventilating bronchoscopy from September 1985 to February 1995. The results were as follows: 1) Among the 59 cases of bronchoscopy, 51 cases(97%) were under the age of 3. The ratio of male and female was 2.69:1 2) Most common presenting symptom was coughing(84.7%) followed by dyspnea, fever, wheezing and anterior chest pain. 3) Among 39 cases of identified foreign bodies, abnormal findings in the chest X-ray films were found in 33 cases(84.6%) and most common abnormal radiologic feature was pneumonia in 10 cases(25.6%) followed by combination of pneumonia and emphysema, or emphysema alone. All the 20 cases of absent foreign body presented abnormal radiologic features and common findings were pneumonia and atelectasis. 4) Vegetable foreign bodies were the most common form of removed airway foreign bodies(69.2%) followed by metallic foreign bodies(12.8%) and plastic foreign bodies(7.7%). 5) By distribution of the location of foreign bodies, 29 cases(74.4%) were located in the main bronchus( 16 cases of right side and 13 cases of left side), 8 cases were in the trachea and 2 cases were found at the cordal level. 6) By duration of foreign body lodgement in the airway, 9 cases(23.1%) were removed within 7 to 30 days, 10 cases(5.6%) within 3 days and 5 cases(12.8%) were enlodged over 30 days. 7) In the cases of absent foreign bodies, common bronchoscopic findings were mucopurulent or thick mucoid discharge in the main bronchi, erythema or edema of bronchial mucosa and all the cases were improved after ventilating bronchoscopy with concomitant medical management.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1983년도 제17차 학술대회연제순서 및 초록
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• pp.10.1-10
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• 1983

1979년 6월부터 1953년 2월까지 3 년 8개월간 본원 이비인후과에 내원한 이물 환자 총 105 례 중 식도 및 기도의 이물 환자 76례를 대상으로 이물의 부위별 빈도, 종류, 연령 분포, 개재 부위 및 기간에 대한 통제학적 고찰을 한 결과 다음과 같은 성적을 얻었기에 보고하는 바이다. 1) 이물의 부위별 빈도를 보면 총 105례 중 식도이물이 가장 많아 68례 (64 .8 %) 였고, 비강 이물이 13례 (12.4%), 구강 및 인두 이물이 7례 (6.7%)의 순이었다. 2) 종류별로 보면 식도 이물에서는 주화가 53례(77.9 %) 로 가장 많았으며, 그 외 부위는 다양한 이물 종류를 나타내었다. 3) 연령별 빈도를 보면 식도 이물에서는 5세 이하가 49례 (72 %) 였으며, 기도 이물에서는 8례 모두 10 세 이하였다. 4) 개재 부위는 식도에서는 제 1 협착부가 61 례 (89.7 %) 로 가장 많았고, 기도에서는 좌측 기관지가 6례 (75 %) 로 우측 기관지보다 많았다. 5) 개재 기간은 객도 이물에서는 1일 이내가 58례 (85.3 %) 였으며, 기도 이물에서 는 3 - 7일이 6례 (75 %) 이었다.

• 천문학논총
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• 제32권1호
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• pp.55-57
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• 2017

Presently, the number of known asteroids is more than 710,000. Knowledge of size and albedo is essential in many aspects of asteroid research, such as the chemical composition and mineralogy, the size-frequency distribution of dynamical families, and the relationship between small bodies in the outer solar system or comets. Recently, based on the infrared all-sky survey data obtained by IRAS, AKARI, and WISE, the large asteroid catalogs containing size and albedo data have been constructed. In this paper, we discuss the compositional distribution in the main belt regions based on the compiled data on size, albedo, and separately obtained taxonomic type information.

• 자원환경지질
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• 제13권2호
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• pp.117-127
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• 1980

Molybdenum as by-products of Sangdong tungsten mine occurrs in the form of molybdenite in quartz vein. The molybdenum contents of scheelite in Sangdong ore bodies ranges from trace to 8%, therefore the scheelites show variable fluorescence colores under ultra-violet lamp (short wave). The fluorescence color are in order high content of molybdenum, yellow, white and blue. The yellow fluorescing scheelite is dominant in upper ore vein, otherwise the blue fluorescent variety is dominant in lower ore vein. The fluorescence color of scheelite in the main ore vein show zonal distribution becoming progressively more blue outerwards, contrary more yellow innerwards, and even in single scheelite crystal, simillar zonal pattern is observed, too. Molybdenite occurrs as flakes or elongated blades at the margins of the quartz vein only molybdenite bearing quartz veins but also other sulfides mineral bearing quartz veins have mainly blue flourescing scheelites. We suggest that the molybdenum contents of the early stage ore solution are progressively decreased by a subsequent crystallization of the yellow fluorescing scheelites.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1977년도 제11차 학술대회연제 순서 및 초록
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• pp.8.5-9
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• 1977

기도 및 식도이물은 이비후과영역에서 적지않게 경험하게 된다. 그중 특히 유소아에서 발생하는 기도이물은 응급을 요하게 되며 진단 및 치료를 지체함으로써 예기치 않은 불행한 사태를 초래하기도 한다. 유소아에서 주로 보이는 기도이물의 증상은 기침, 기침음, 호흡곤란 등이며 천식, 폐염, 후두염 등으로 혼동되기도 한다. 이물의 종류파 빈도를 환자의 연령, 생활방식, 환경, 문과수준에 따라 그 양상을 달리한다. 저자들은 1975년부터 1977년 4월까지 본원에 내원하여 기도이물의 진단하에 ventilating bronchoscopy, thoracotomy (이중 1례는 사망)을 시행하여 치유된 35례를 분석하였다. 1. 연령층은 1세부터 5세까지가 48%로 가장많고 다음이 0세에서 1세까지 였다. 또한 남과여의 비는 2.1 : 1로 남자가 많았다. 2. 주증상은 호흡곤란, 기침, 기침음의 순서였다. 3. Foreign body의 종류는 peanut, metal, vegetable의 순이였다. 4. 이물의 소재는 주로 우측 주기관지 였으며 우측과 좌측의 비는 2 : 1이었다. 5. 내원까지의 기간은 24시간 이내가 65%로 가장 많았다. 6. 치료는 ventilating bronchoscopy가 27례로 가장 많았으며, 4례는 자연적으로 치유되었다. 이에 과거의 여러 보고들과 비교하여 문헌적 고찰과 함께 보고하는 바이다.

• 대한기관식도과학회:학술대회논문집
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• 대한기관식도과학회 1978년도 제12차 학술대회연제 순서 및 초록
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• pp.4.3-5
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• 1978

식도이물은 이비인후과 영역에서 응급을 요하는 경우로서 진단 및 치료가 지체되면 예기치 않은 불행한 사태가 일어날 수 있다. 저자들은 1975년부터 1977년까지 3년간 본원에서 시도된 50례의 기도이물에 대해 고찰하였다. 1. 남여비는 2.8 : 1이였다. 2. 연령은 3개월부터 52세 사이였으며, 1세부터 5세까지가 58%로 가장 많았다. 3. 주증상은 해수: 68%, 호흡곤란: 52%, 청색증;18% 순이었다. 4. 기도이물 진단시 병력이 확실한 경우는 66%이었다. 처음 오진율은 28% 이었으며 그중 57.1%가 상기도감염으로 인한 오진이었다. 5. 처음 내원시 청진상 호흡음 감소가 46%로 가장 많았으며 그 다음 천식음이 24%, 정상이 26%이였다. 방사선 검사상 폐기종이 82%, 폐부전확장이 20%이었으며, 정상범위가 18%이었다. 6. 내원까지의 기간은 24시간이내가 48%로 가장 많았으며, 가장 오래된 것은 1년반 이었다. 내원후 제거까지의 기간은 24시간 이내가 68%이며 가장 오래 걸린 예는 9일이었다. 7. 치료는 기관절개한 경우가 24%로 그 중 75%가 식물성 기도이물이었다. Ventilating bronchoscopy로 치유된 경우는 72%이었으며. 자연배출된 경우가 8%, 기관절개창으로 자연배출된 경우가 6%, 개흉술 치유된 경우가 6%, 그외 사망, 후두직달경, 기관직달경에 의한 제거가 각각2% 이었다. 8. 기도이물의 종류는 식물성 46%, 금속성 28%, 프라스틱 18%, 동물뼈 8%이었다. 9. 이물의 소재는 기관 16% 우측기관지 52%, 좌측기관지 28%, 미상 4%이었다.

• 천문학회보
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• 제45권1호
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• pp.46.2-46.2
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• 2020

Dust ejection activities have been discovered from a few tens of asteroids since the first confirmation in 2006. Those objects are known as active asteroids. They provide good observational chances to study ongoing phenomena in the solar system such as sublimation of icy volatiles, mutual collisions among asteroids, rotational disintegrations, thermal fatigue, etc. Although dust ejection mechanisms of individual cases have been investigated through observations, the frequencies of the events and their connection to the overall evolutionary budget of the solar system have not yet been studied thoroughly, mainly because previous studies were based on serendipitous discoveries without any systematic surveys of these objects. In this work, we made wide-field monitoring observations of asteroids using Korea Microlensing Telescope Network (KMTNet) during the 2018/2019 winter season. Among 3,644 asteroids in the field-of-view, we detected nine candidates of brightness enhancements which we suspect as possible activities. It is still possible that some of those brightness increases have caused by long-term rotations. However, our observed frequency and brightness enhancements size-frequency distribution agrees with the expectations from impacts with decimeter sized objects, when the main belt objects size-frequency distribution observed down to decameter sized bodies are extrapolated to decimeter size.

• 한국해양공학회지
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• 제20권6호
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• pp.101-107
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• 2006

Recently, with the increase in requirements for marine development, a marine urbanism is being visualized, with more and more huge-scale structures at the scope of the ocean space utilization. In particular, a pontoon-type structure has attracted attention, since The Floating Structures Association of Japan proposed a new concept as the most suitable one of floating airports. The Very Lage Floating Structure (VLFS) is considered a flexible structure, for a quite large length-to-breadth ratio and its geometrical flexibility. The main objective of this study is to makean exact and convenient prediction about the hydro-elastic response on very large offshore structures in waves. The numerical approach for the hydro-elastic responses is based on the combination of the three dimensional source distribution method and the dynamic response analysis method, which assumed a dividing pontoon type structure, as many rigid bodies connected elastic beam elements. The established hydo-elastic theory was applied to the radiation forces caused by motions of a whole structure, formulated using the global coordinate system, which has the origin at the center of the structure. However, in this paper, we took radiation forces, occurred by individual motions of floating bodies, into consideration. The calculated results show good agreement with the experimental and calculated results by Yago.