• Journal of Dental Rehabilitation and Applied Science
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• v.23 no.1
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• pp.1-10
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• 2007

악관절 잡음과 동통,과두 흡수를 동반한 퇴행성 측두하악장애는 교합 불안정과 개구장애 를 동반하기도 한다. 진단을 위해 CT나 MRI를 이용해 과두 형태 및 디스크 위치를 파악하 는 것이 유용한 접근법이다. 퇴행성 측두하악관절 환자는 CT나 MRI를 이용하여 진단하고, 과두-원판 재위치와 근 기능 개선을 위해 장기간 교합 안정장치 사용이 필요하므로 교정치료 기간에 변형된 교합 안정장치의 병용이 필요하다. 이에 본 연구에서 교합 안정장치를 병용하여 교합 재구성 증례를 CT나 MRI로 고찰해 보고자 한다.

• Proceedings of the Korean Geotechical Society Conference
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• 2006.03a
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• pp.600-606
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• 2006

실제 지반은 경계가 없는 무한상태로 존재하기 때문에 지반구조물의 동적거동을 유한요소법을 이용하여 해석할 시 모델의 영역을 성립하는 것은 특별한 고려가 필요하다. 유한요소법에서의 동적해석은 파동의 전달을 포함하기 때문에 모델의 경계에서 인공적인 경계조건이 필요하다. 인공적인 경계 조건은 유한요소내의 지반상태를 무한상태로 변형시킬 수 있어야 하며, 경계에 도달하는 응력 파동을 모델내로 반사시키지 않고 흡수 할 수 있어야 한다. 본 논문에서는 간단한 점 탄성 반무한 불연속 요소를 이용하여 지반구조물의 동적해석을 수행하는 방법을 보여준다. 반무한 요소의 실행은 OpenSees라는 유한요소 해석프로그램을 이용하여 수행되었으며, 예를 통하여 불연속 요소가 경계에 도달하는 응력 파동을 충분히 흡수하여 유한요소 모델을 반무한 상태로 전환 시킬 수 있다는 것을 보여준다.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 1997.10a
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• pp.765-768
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• 1997

Many malfunctions take place in container crane spreader due to impact. So we designed a hydraulic impact absorbing equipment to absorb the impact and we studied the change of damping coefficient with respect to the variation of dimensions of oil-cylinder wall. When we design the dimension of hydraulic cylinder wall considering the displacement on the wall, the value of it over 20mm didn't affect the damping coefficient.

• Journal of the Korean Society of Food Science and Nutrition
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• v.21 no.2
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• pp.219-230
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• 1992

Nutrients and drugs are similar to biological fate, such as absorption, metabolism and excretion. Such procedure may interact with nutrients and drugs. Drugs can influence nutrient absorption, metabolism or excretion ; the effects may impair the nutritional status of a patient. Specific nutrient, nutritional status, or dietary factors alter drug utilization. Therefore, medicated patients need to be aware of good nutrition practices and to understand the importance of dietary modifications associated with certain diseases. A nutritious and well balanced diet not only makes an important contribution to the health of those patients, but also reduces the risk of nutrition disorders or altered the pharmacological action of drugs.

• The Journal of the Korea Contents Association
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• v.13 no.3
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• pp.204-210
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• 2013

The patients who had been operated total mastectomy are different from general women in their breasts thickness due to breast surgery. As a result, digital chest image from total mastectomy patients will be different attenuation. The main objective for this study is to show that a proper Ion chamber standard combination measuring MTF which is objective basis for Digital image, when be x-ray for total mastectomy patient. We have designed the unique number that shown Left is 1, Right is 2, Center is 3 and have put the edge phantom on detector ion chamber. Lastly, we have obtained experiment images. The evaluations of all image quality have measured by 50% MTF of spatial resolution and absorption dose using Matlab(R2007a). The result showed that average exposure condition, MTF value, absorption dose for 1+3 and 2+3 combinations were 2.745 mAs, 1.925 lp/mm, 0.688 mGy. Consequently, that showed high MTF, DQE and low dose than other combinations. Therefore, a proper changes of ion chambers are able to improve image quality and to reduce radiation exposure when be X-ray for total mastectomy patients. Also, it will be possible to standard for application chamber combination and utilization on clinical detection.

• Journal of the Korean Society of Food Science and Nutrition
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• v.25 no.5
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• pp.796-803
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• 1996

Gamma irradiation was applied to soybean(Glycine max.), Hwangkeum, at dose levels of 0, 5, 10 and 20 kGy to improve the physical properties of soybeans. The time to reach a fixed moisture content was reduced depending on the increment of soaking temperatures and applied irradiation dose levels. Irradiation at 5~20 kGy resulted in reduction in soaking time of the soybeans by about 3~6 hrs at soaking temperature of $20^{\circ}C.$ The degree of cooking of soybeans in boiling water was determined by measuring the maximum cutting force of cotyledon. The cutting force to reach complete cooking was about 145g/g. Irradiation at 5~20 kGy resulted in a reduction of cooking time of soybeans by 55~75% as compared to the nonirradiated soybean. In electron microscopic observation of seed coat inner, the parenchyma of nonirradiated soybean showed tight fibrillar structure, whereas that of irradiated soybeans showed loosened and deformed structure. The microstructure of compressed cells and cotyledon epidermis was also deformed by gamma irradiation. In subcellular structure of cotyledon, the roundness of protein body was deformed and changed to spike shape at 20 kGy. Also, the size of lipid body decreased as the irradiation dose levels increased.

• Journal of the Korea institute for structural maintenance and inspection
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• v.20 no.6
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• pp.20-29
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• 2016

This study investigates the effect of the absorbent materials on the material properties(compressive strength and drying shrinkage) of natural hwangtoh mortar which is one of the traditional building material in Korea. The absorbent materials used are seaweed paste and Super-Absorbent Polymer(SAP). In addition to the absorbent materials, the initial sealed curing recommended by the standard specification of properties for Korean traditional building materials is also a main interest of this study. Based on the test results of 28 days compressive strength and converged drying shrinkage, it is confirmed that the initial sealed curing for 7 days is effective to reduce the drying shrinkage and to enhance the compressive strength. Thus, it is verified that the recommendation is reasonable and has positive effects on the properties of the mortar. Next, the test results show that the addition of absorbent materials into the mortar is also effective to the two properties depending on their absorption capacity. Thus, it is more effective to use SAP than the seaweed paste because of higher absorption capacity. However, both the initial sealed curing and keeping total water contents of the mortar are required to show this effectiveness. Lastly, the compressive strength is inversely proportional to the drying shrinkage. By using this relation, the reason of the increase of compressive strength due to the initial sealed curing or the addition of absorbent materials is quantitatively explained.

• The Journal of Korean Academy of Prosthodontics
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• v.50 no.2
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• pp.99-105
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• 2012

Purpose: The change of the marginal bone around dental implants have significance not only for the functional maintenance but also for the esthetic success of the implant. The purpose of this study was to investigate the load transfer of internal conical joint type implant according to marginal bone resorption by using the three-dimensional finite element analysis model. Materials and methods: The internal conical joint type system was selected as an experimental model. Finite element models of bone/implant/prosthesis complex were constructed. A load of 300 N was applied vertically beside 3 mm of implant axis. Results: The pattern of stress distribution according to marginal bone resorption was similar. The maximum equivalent stress of implant was increase according to marginal bone resorption and the largest maximum equivalent stress was shown at model of 1 mm marginal bone resorption. Although marginal bone loss more than 1mm was occurred increasing of stress, the width of the stress increase was decreasing. Conclusion: According to these results, the exposure of thin neck portion of internal conical joint type implant is most important factor in stress increasing.

• Annual Conference on Human and Language Technology
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• 1997.10a
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• pp.200-207
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• 1997

본 논문에서는 계층적 랜덤 그래프를 이용한 필기 한글 인식 방법론을 제안한다. 한글은 다른 문자와 달리 기본 자소의 조합으로 이루어진 문자로서 2차원 평면상에 표현된다. 이러한 한글의 특성과 필기된 한글에서 나타나는 다양한 변형을 통계적으로 모델링하기 위해서 계층 그래프를 이용하였다. 특히, 계층 그래프의 최 하위 계층에서는 필기된 획의 변형을 흡수할 수 있도록 확장된 랜덤 그래프를 적용하였다. 제안된 모델은 통계적 모델이기 때문에 필기 데이터베이스로부터 모델의 파라미터를 구할 수 있다는 장점이 있다. 실험에서 제안된 모델을 필기 한글 인식 문제에 적용하여 자소간 접촉된 문자나 어느 정도의 흘려 쓴 문자도 잘 인식할 수 있음을 보였다.

• Annual Conference on Human and Language Technology
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• 2001.10d
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• pp.359-364
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• 2001

필기 한글문자 인식은 다양한 필기 변형, 자모 간의 접촉과 같은 문제들을 내포하고 있다. 최근 이를 해결하기 위한 방법으로 랜덤 그래프를 이용한 필기 한글 모델링이 제안되었으나, 상향식 정보처리의 한계인 시간 복잡도 문제를 겪고 있다. 영어 단어인식에 관한 인지과학적 연구에서는 하향식 정보처리의 주요한 역할 중 하나로 인식 과정에서의 계산 중복을 없애는 필터링의 역할을 들고 있다. 본 논문에서는 랜덤 그래프를 이용한 필기 한글 모델링을 기반으로 하여 필기체에 나타나는 다양한 변형을 흡수하며, 시간 복잡도를 해결하기 위한 한글 문자의 구조에 바탕을 둔 하향식 정보처리 방법을 제안한다. 제안하는 방법은 모델 발화를 이용한 자모 후보 추출 DP 정합과 동적 격자 탐색을 이용한 문자 후보 탐색, 그리고 문자의 구조적 제약을 이용한 후보 제거 기법을 포함한다. 필기 한글 데이터베이스인 SERI-DB에 대한 예비 실험 결과, 제안한 방법은 인식률의 큰 저하 없이 상향식 정보 처리에 바탕을 둔 기존 방법에 비해 높은 속도 향상을 가져 왔다.