• Pediatric Infection and Vaccine
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• v.23 no.3
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• pp.202-208
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• 2016

Purpose: Rotavirus vaccine (RV) was introduced in Korea since 2007, and intussusception (IS) remains an important safety concern. This study investigated the trend of IS occurrence related to RV as well as the temporal relevance between vaccination and IS in children. Methods: We collected data of the patient aged ${\leq}18$ years with IS admitted to Gachon University Gil Medical Center, 2003 to 2015. For the patients that have occurred since 2008, the immunization records of RV were collected. The proportion of cases <1 year was calculated by the year and the temporal relationship between vaccination and IS occurrence was analyzed. Results: A total of 696 IS cases were noted. The cases <1 year were 30.7% (214/696). Although the incidence of all IS has increased over the 13-year period (from 74.1 in 2003 to 89.5 in 2015, linear by linear association, P=0.003), the incidence of IS <1 year has not increased (from 56.9 in 2003 to 53.3 in 2015, P=0.910), and the proportion of cases <1 year has decreased (from 35.4 in 2003 to 18.8 in 2015, P=0.000). Of 128 cases <1 year since 2008, 53.9% received RV. In the vaccinated group, 10 cases of IS occurred within 30 days, and eight cases did within 31 to 60 days. Numbers of IS after first, second, and third dose were three, 10, and five cases, respectively. Conclusions: Occurrence of IS in children <1 year of age did not increase since the introduction of RV. Further monitoring is essential for evaluation of vaccine safety.

• Proceedings of the Korean Information Science Society Conference
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• 2001.10a
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• pp.217-219
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• 2001

이동 기기의 발달로 이동 객체의 위치 정보에 대한 연구가 진행되고 있다. 그러나 시공간 데이타베이스에서 요구하는 질의를 효과적으로 처리하기 위한 인덱스 구조는 많지 않다. 사용자는 먼저 범위 질의를 던져 이동 객체를 뽑아낸 후 궤적 질의를 던지게 되는데 이것을 결합 질의라 한다. 기존 방법인 TB-tree는 MBR의 겹침이 심해 성능이 저하된다. 본 논문에서는 결합 질의를 효과적으로 처리할 수 있는 CR-tree 인덱스 구조를 제안한다. CR-tree는 R-tree와 연곁노드로 구성된다. R-tree 부분은 MBR의 겹침을 최소화해 범위 질의를 효과적으로 처리하고 연결 노드 부분은 이동 객체별로 궤적의 부분을 차례로 저장해서 궤적 질의를 빠르게 저리한다. 즉 결합 질의시 R-tree를 이용해 범위에 속하는 이동 객체를 검색하고 연결 노드를 이용해 그 객체의 궤적을 찾는다.

• Proceedings of the Optical Society of Korea Conference
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• 2003.07a
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• pp.206-207
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• 2003

광집적회로의 등장으로 그 설계에 있어서 다양한 구조의 광배선은 필수적 요소가 되었다. 일반적으로 전기적 배선 및 소자간에 전자기파의 간섭으로 인해 신호의 왜곡이 야기될 뿐 아니라 기생정전효과 등에 의해 소자 시간지연이 유발되듯이, 광 집적회로에서도 광배선간 감쇄필드의 겹침으로 인해 원하지 않는 광결합이 발생하게 된다. 이러한 광집적회로내에서의 이러한 불필요한 광결합을 줄이기 위해서 곡선형 구조의 광배선들이 이용되며 대부분의 경우 이러한 곡선형 도파로 부분의 광결합은 무시된다. (중략)

• Journal of the Institute of Electronics Engineers of Korea SP
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• v.41 no.2
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• pp.11-22
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• 2004

Conventional algorithms of separating overlapped objects are mostly based on template matching methods and thus their application domain is restricted to 2D objects and the processing time increases when the number of templates (object models) does. To solve these problems, this paper proposes a new approach of separating the occluding object from the stack of 3D objects using the relationship between surfaces without any information on the objects. The proposed algorithm considers an object as a combination of surfaces which are consisted with a set of boundary edges. Overlap of 3D objects appears as overlap of surfaces and thus as crossings of edges in 2D image. Based on this observation, the types of edge crossings are classified from which the types of overlap of 3D objects can be identified. The relationships between surfaces are represented by an attributed graph where the types of overlaps are represented by relation values. Using the relation values, the surfaces pertained to the same object are discerned and the overlapping object on the top of the stack can be separated. The performance of the proposed algorithm has been proved by the experiments using the overlapped images of 3D objects selected among the standard industrial parts.

• Journal of the Korean Chemical Society
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• v.30 no.6
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• pp.538-547
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• 1986

The 8 rare earth elements were determined in the monazite concentrates by X-ray fluorescence spectrometry. The spectral line overlapping interferences from the other elements were investigated and the correction methods of interferences were studied using line overlap coefficients. The coefficients were calculated from the ratios of the intensities measured at the diffracted angle (2${\theta}$) of the analytical lines of other elements to the intensity of pure rare earth oxide. The coefficients were used to correct the line overlaps by a regression analysis. The linearities of calibration curves from the corrected intensities were remarkably improved, and their standard deviations were decreased. The analytical results agreed with that of the inductively coupled plasma(ICP) spectrometry within an allowable error range.

• Journal of KIISE:Computing Practices and Letters
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• v.12 no.4
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• pp.241-253
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• 2006

In modem societies, a monitoring system is required to automatically detect and track persons from several cameras scattered in a wide area. Combining multiple cameras with non-overlapping views and a tracking technique, we propose a method that tracks automatically the target persons in one camera and transfers the tracking information to other networked cameras through a server. So the proposed method tracks thoroughly the target persons over the cameras. In this paper, we use a person model to detect and distinguish the corresponding person and to transfer the person's tracking information. A movement of the tracked persons is defined on FOV lines of the networked cameras. The tracked person has 6 statuses. The proposed system was experimented in several indoor scenario. We achieved 91.2% in an averaged tracking rate and 96% in an averaged status rate.

• Composites Research
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• v.36 no.1
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• pp.25-31
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• 2023

Composite structures have been designed by stacking the laminae with different stacking angles to meet the required mechanical performance. Although the induced stresses on the composite structures under the external loads usually differ depending on the location, we determined the stacking sequence based on the maximum stress, which leads to low efficiency and generally is not the optimum design. Recently, piecewise integrated composites (PICs) were suggested for solving this inefficiency. PICs assume the perfect bonding between adjacent pieces, but this is ideal and hard to accomplish. Therefore, the overlap at the boundary is essential to prevent separation from each other. In this study, we investigated the effect of the overlap design on the impact failure mode of PIC plates. We fabricated the sample composite plates with different overlap designs using the fast curing carbon prepreg and conducted the impact tests according to ASTM D 7136. We found that PICs had different failure modes according to the overlap design, which lead the changes of absorbed impact energies as well as impact load curves.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.6
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• pp.783-790
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• 2004

Adhesive-bonded joints are widely used in the industry. Recently, applications of adhesive bonding joints have been increased extensively in automobile and aircraft industry. The strength of adhesive joints is influenced by the surface roughness, adhesive shape, stress distribution, and etc. However, the magnitude of the influence has not yet been clarified because of the complexity of the phenomena. In this study, as the fundamental research of adhesive bonding joints, the effects of adhesive shape and loading speed on bonding strength properties and durability of aluminum to polycarbonate single-lap joints were studied. To evaluate the effect of adhesive shape, several modified shapes were used, and loading speeds were varied from 0.05 to 5 mm/min. As a result, the load-displacement distribution was shown a brittle fracture tendency. The trigonal edged single lap and bevelled lap joints showed the higher strength than the plain single lap, trigonal single lap, joggle lap and double lap joints in same adhesive area. The fractures of trigonal single lap and trigonal edged single lap joints that had the higher strength level were shown as the mixture type of the cohesive and interfacial-failure, mostly joggle lap joints that had the lower strength level were shown as the adhesive-failure.

• Biomedical Science Letters
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• v.1 no.1
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• pp.89-94
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• 1995

Considering the planar structure and nonpolar properity of benzo(a)pyrene(B(a)p) and the planar heme part of cytochrome P-450, stacking interaction is probable. MO calculation on B(a)P and heme part of cytochrome P-450 were carried out to dertermine probable stacking interaction models. In this case, orbital interaction is most important. Accordingly, the stacking positions have high eigen vector in frontier orbital and boning type between two molecules. In this way, five probate models were selected and examined by MN2 and MO method. The most probable .stacking interaction model which is the 4, 5, 6 positions of B(a)P overlap carbon atom and pyrrole ring of ring of heme group was determined.

• Proceedings of the KSME Conference
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• 2003.11a
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• pp.1039-1044
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• 2003

Adhesive-bonded joints are widely used in the industry. Recently aircraft applications of adhesive bonding joints have been increased extensively in automobile and air industry. Because adhesives which are available for structural applications have been developed a lot and understanding of adhesive bonding has been improved so much. In this study, as the fundamental research of design of adhesive bonding joints, this study considers specimen shape are affect strength and durability of Al/Polymer lap joints. In this research, cross head speed difference were concerned to evaluate their effects on the adhesive strength. Cross head speed makes a change 0.05mm/min, 0.5mm/min, 5mm/min. The result is load-displacement diagram showed brittleness fracture tendency. Fracture tendency that is shown enough on stress distribution of trigonal single lap joint and trigonal edged single lap joint occur the inside of adhesive.