• Journal of Plant Biology
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• v.24 no.1
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• pp.31-45
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• 1981

The purpose of this study aimed to study effects of fire on vegetation and soil properties after the first growing season in Mt. Chiak. 1. With the basis of importance value of species in each stand, status of species was assessed for three categories; Increaser species, Decreaser species, and Neutral species. 2. Biomass was 2.2 times higher on burned area than unburned. This indicates that biomass was remarkably increased after fire. 3. To evaluate similarity, coefficients of similarity among communities were obtained, and correlation coefficients were also estimated. These indices showed that burned and unburned community were markedly different.. $B_1$-stand and $B_1$-stand appeared most similar to each other among stands. 4. Species diversity was greater in burned than unburned stands. 5. Soil pH value and organic matter content in burned area were significantly higher than those in unburned area. However, soil water content was lower in burned area. There was no effect of burning on soil pH value and water content at 15~20 cm depth of soil. 6. All chemical compositions except sodium were much higher in soil surface. The decreases in sodium levels at surface were probably resulted from the rapid leaching due to the increased solubility and decreased capacity for adsorption of sodium in comparison with potassium or calcium. Among chemical compositions of soil amount of nitrogen showed least difference between the burneb and unburned surfaces soil.

• Proceedings of the Computational Structural Engineering Institute Conference
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• 2009.04a
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• pp.47-50
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• 2009

본 논문에서는 불균질 재료의 균열진전을 해석하기 위한 방법으로 변절점 유한요소를 이용한 멀티스케일 기법을 제시하였다. 효율적인 해석을 위하여 서로 다른 스케일의 요소망을 적용하여 전체 모델의 자유도를 감소시킨다. 균열선단과 비교적 멀리 떨어져 있는 영역은 균질화 기법을 도입하여 불균질 재료에 대한 등가물성을 갖는 성긴 요소망으로 대체하고, 균열선단 주변의 요소망은 재료의 기하학적 특성과 불균질성을 반영하도록 조밀하게 구성한다. 한편 균열선단에 존재하는 응력 특이성을 표현하기 위하여 균열선단을 포함한 요소를 더욱 조밀한 요소망으로 분할하여 구성한다. 여기에서 서로 다른 스케일의 요소망 경계에는 변절점 유한요소를 적용함으로써 경계에서의 절점 연결조건과 적합성을 만족시킬 수 있다. 제시한 멀티스케일 기법을 수치예제에 적용함으로써 정확성과 효율성을 검증하였으며, 특히 불균질 성분이 균열진전에 미치는 영향을 경계조건과 T-응력의 관점에서 분석하였다.

• 방재와보험
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• s.116
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• pp.44-49
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• 2006

사람이 다르면 인정이 다르고, 인정이 다르면 민속도 달라지기 마련이다. 불을 어떻게 인식하고, 불을 어떤 방식으로 대했는가 하는, 민족 저마다의 민속행위를 주목하는 까닭이 바로 여기에 있다. 그러나 불은 본디부터 인간에게 종속되 것이 아니었고, 오히려 인간이 함부로 다가설 수 없는 변화무쌍한 변물이었다. 그렇기에 불을 '그 어떤 것' 으로 여기고 여기에 신성을 덧붙여 숭봉하는 태도는 모든 문화에 두루 나타나는 보편적인 현상이다. 아마도 불을 얻는 데 소요되었던 노력과 그 노력의 깊이에 따른 지혜의 축적이 그만큼 길었기 때문일까. 한편으로는 숭엄한 사건을 서술하는 신화(myth)로 기억되고, 한편으로는 굳건한 신앙의 대상으로 일상의 삶에 영향을 끼치면서 규범으로 자리잡고 있다. 이를테면 원초적인 신성을 지닌 존재로서 엄중한 신격으로 숭신되기도 하고, 특별한 의례로 해마다 반복되며 규범과 도덕률로 일상을 구속하고 있다. 일상에 가까이 있되 결코 범접할 수 없는 장엄인 것이다. 몽골 유목민의 경우도 예외는 아니다. 다만 그 양상과 의례의 세부 모습이 다를 따름이다.

• Proceedings of the Korean Association of Geographic Inforamtion Studies Conference
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• 2004.03a
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• pp.307-313
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• 2004

정부에서는 사회 경제적으로 많은 문제를 발생시키고 있는 지적불부합지 문제를 해결하고자 지적재조사 사업을 계획하였으나 수 조원에 달할것으로 예상되는 막대한 사업비와 국민적인 이해부족으로 인하여 중단이 되었다. 이렇게 지적재조사 사업이 전면 중단된 상황에서 지적불부합을 효율적으로 해결하기 위해서는 현지 측량 방식에 기반하여 불부합지를 조사하고 정리하기보다는 현재 구축되어 있는 지적도 전산화 데이터와 GIS 관련 데이터 등을 최대한 활용하여 조사할 수 있는 새로운 방법론의 모색이 필요하다. 본 연구에서는 기 구축되어 있는 수치지적도와 수치지형도를 이용하여 지적불부합을 측정할 수 있는 방법론과 절차를 개발하였다. 그리고 모든 과정을 상용 GIS 소프트웨어를 이용하여 구현하였다. 방법론의 실험을 위해 실제 사례지역을 선정하여 적용하여본 결과 불부합을 정량적으로 조사하고 해석할 수 있는 가능성을 제시할 수 있었다.

• Proceedings of the Korea Information Processing Society Conference
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• 2015.04a
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• pp.859-861
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• 2015

생산 기술이 발전함에 따라 제품의 생산량이 증가하고 컴퓨터 비전을 통한 제품의 양/불 판단 기술의 필요성이 증가하고 있다. 제품의 양/불 판단은 그 정확도가 중요하며, 동시에 빠른 검사를 위한 신속성이 요구된다. 기존 연구들에서 다양한 금속성 제품에 대한 양/불 판단과 각인된 글자에 대한 양/불 판단을 수행하는 연구가 지속되어 왔으나 자동차 에어백 부품 중 하나인 Upper Housing의 양/불을 판단하는 알고리즘은 부재하다. 본 논문에서는 Upper Housing에 대해 각인 문자의 양/불을 판정하는 알고리즘을 제안한다. 먼저 영상에서 기준점이 되는 원을 찾는 것부터 시작하여, 기준점을 기반으로 특정 각도로 회전시켜 미리 수집한 글자 이미지와의 템플릿 매칭을 통해 글자가 제대로 각인 되었는지를 판단한다. 실험에서는 에어백 부품에 대한 검사 장치에서 촬영한 동영상에 대하여 제안한 알고리즘을 적용하였고, 그 결과 높은 정확도로 글자를 검출할 수 있음을 확인하였다.

• Journal of agricultural medicine and community health
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• v.20 no.1
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• pp.39-49
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• 1995

This study was attempted to investigate the acceptive status of 428 persons who had taken the vasectomy and the tubal ligation and the intra-uterine device(IUD, copper-T). It defined the complications after the contraceptive procedures and the effects of the supporting of the government for contraception. The target population was identified from the list of the 105 females taken tubal ligation, and 109 males vasectomized, 214 IUD acceptors covered by Gumi Health Center from January 1990 to December 1992. Data was collected from the target population by the questionnaire and medical records between March 1 and April 30, 1993. Among the study subjects, 56.0% of vasectomized males was between 30 and 34 years of age and the highest percentages of tubal ligation and IUD acceptors were between 25 and 29 years of age. The highest percentage of occupation of vasectomized males was officials and that of tubal ligation and IUD acceptors was in no occupational status. 81.2% of respondents were more than high school in educational level, educational level of vasectomized males was more higher than that of females. The percentage contraceptive acceptors with one or two children was 90.8% for vasectomized males, 80.1% for females with tubal ligation, and 93.9% for IUD acceptors. The most people accepted the contraception as they felt the need rather than other's persuasion. The major reasons of contraception were having the wanted children and alleviating the economic burden for the raising and the educating their children. Among the vasectomized males, 11.0% complained the side reaction and the most common symptoms were the inflammation around the wound and sexual declination. Among the tubal ligation females, 46.7% complained the side reaction and the most common symptoms were vaginal discharge, the menorrhagia, back pain and lethargy. The IUD acceptors were similar to them. The regretting rate of tubal ligation and the IUD acceptors was higher than the vasectomized males. The major reason of their regretting was the side reaction in the tubal ligation and the IUD. But the vasectomized males had the insecurity that they couldn't have their own children any more, and sexual declination. The main reason of the females accepted the tubal ligation and the IUD were the fears about toward induced abortion. The most contraceptive acceptors(83.2%) wanted to be offered by the government, but if they pay the expense in their own money, they would accept the contraception in 86.9%.

• Journal of the Korean Society of Surveying, Geodesy, Photogrammetry and Cartography
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• v.23 no.1
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• pp.19-30
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• 2005

Korean government has constructed a nationwide cadastral map database through the cadastral map computerization project and also produced a variety of spatial data through the NGIS (National Geographic Information Systems) project. Under this circumstance, it is needed to set up the new automatic methodology that effectively solve cadastral non-coincidence problems by using various digital map data instead of expensive field survey methods. This study proposed a new automatic methodology for cadastral non-coincidence surveying and developed a prototype system as a proof of concept. Validation of this proposed method was done with some test areas. Results showed that this methodology could easily detect and assess both regional non-coincidence levels and cadastral map quadrangle non-coincidence levels. We expect that this new methodology can provide many benefits in planning and determining work priority of the forthcoming nationwide cadastral re-surveying project.

• Journal of the korean academy of Pediatric Dentistry
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• v.28 no.1
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• pp.82-86
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• 2001

The aim of this study was to investigate the level of radiopacity of esthetic dental restorative materials and determine the optimum level of radiopacity in pediatric dentistry. Disks of 8 dental restorative material groups as the experimental group, 7mm in diameter and 2mm thick, were radiographed with intact human deciduous teeth and aluminum stepwedge standard. Radiopacity was evaluated with an image analysis program following the digitization of the radiographs using a flatbed scanner with transparency unit. All materials and tooth structure also the significant difference except FP, VB, VM. For the radiopacity of esthetic restorative dental materials to exceed that of enamel, it should be greater than 1.7mm of equivalent thickness of aluminum.

• Geophysics and Geophysical Exploration
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• v.9 no.2
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• pp.148-154
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• 2006

The effect of small-scale near surface inhomogeneity on Rayleigh wave propagation and dispersion has been investigated in this study using two-dimensional FEM elastic modeling. Various inhomogeneity models with a variety of geometrical shape and embedment depth which exist in homogeneous half-space and two-layered media are considered. Results show that any near surface inhomogeneity greater than one wavelength in terms of minimum wavelength of Rayleigh wave shows dispersion characteristics. Such dispersion effect become stronger as the dimensions of the inhomogeneity increase. The effect of horizontal dimension is more dominant factor governing the dispersion characteristics than vertical dimension. However, the dispersion effect can not be identifiable in seismogram if the horizontal dimension is not wide enough. Nonetheless, even in this case, the existence of inhomogeneity can be inferred by the reflection or transmission event of Rayleigh wave. The results can be expected to provide insights on the behavior of Rayleigh wave which may be helpful for designating field work or new processing scheme to detect near surface inhomogeneity by surface wave method.

• Journal of the Korean Chemical Society
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• v.50 no.1
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• pp.37-45
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• 2006

gel electrophoresis (CGE) with poly(ethylene oxide) has been applied to the measurement of CAG repeat number in Androgen receptor (AR) gene related to male infertility. Non-linear regression analysis was performed using the standard X174 RF/Hae III, 100bp step ladder DNA in order to investigate the exact number of CAG repeat. For 79 Korean infertile males and 89 controls, CAG repeats at exon 1 in AR gene was compared and analyzed by CGE. It turned out that CAG repeat numbers were 24.972.6 range, 17-29) for the infertile male, and 23.992.4 range, 18-29) for the control, respectively. P value (0.018) was less then 0.05, meaning that the result was statistically meaningful.