• Annual Conference of KIPS
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• 2003.11a
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• pp.487-490
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• 2003

기계번역 시스템에서 복합단위 처리는 원문의 분석 부담을 줄이고 조합적으로 대역문의 의미를 생성하지 못하는 원문의 처리를 위해 필수적이다. 본 논문에서는 정규표현(Regular Expression)을 이용하여 영어의 연속(Non-Interrupted) 및 불연속(Interrupted) 복합 단위를 인식하는 복합단위 인식기를 제안한다. 제안된 방법은, 기존에 trie 와 같은 index 의 갱신 과정이 불필요하므로, 다수의 작업자에 의해 복합단위 사전을 동시에 구축하는 경우에, 한 작업자의 결과가 실시간으로 다른 작업자의 작업에 반영되는 장점이 있으며, 복합단위 인식에 있어 정규 표현을 이용함으로써 복합단위 인식기의 성능을 선언적으로 향상시킬 수 있다. 번역 실행시의 고속 탐색을 위해서는 전체 복합단위로부터 FSA(finite State Automata) 를 자동으로 구축하여 빠른 속도로 인식 가능하도록 하였다.

• Computational Structural Engineering
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• v.11 no.4
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• pp.187-196
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• 1998

불연속 갤러킨 정식화에 기초를 둔 시간적분법에 대하여 시간을 변수로 한 유한요소적 접근법을 시도하였다. 단일 형상함수와 두 형상함수 정식화에 대해 각각 선형, 이차 형상함수를 적용하여 모두 네 종류의 시간적분법을 유도하였으며, 각 방법에 대하여 시간시텝의 증가에 따른 변위와 속도의 관계를 나타내는 증폭행렬을 계산하였다. 유도된 방법들의 성능을 평가하기 위하여 부하가 갑자기 변화는 진동 문제를 해석하고 변위의 오차를 비교하였다. 네 가지의 방법에 대하여 국부 오차 추정치를 개발하였으며, 오차 추정치의 정확도를 수치예를 이용하여 평가하였다. 단일 형상함수 정식화에서 이차 형상함수를 이용한 오차 추정치가 실제 국부오차를 잘 나타내었으며 유도된 오차 추정치는 시간간격제어 기법에서 시간간격의 크기를 결정하는 척도로 이용 가능하다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2021.05a
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• pp.120-121
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• 2021

The organic insulation material has excellent thermal insulation property, but it is difficult to expect fire stability, and semi inorganic insulation only delays combustible hour but it is difficult to expect fire stability. In this study, thermal insulation property of cement-based non-combustible inorganic insulation using cement and non combustible materials and redispersible polymer powder was studied. As a result of the experiment, the thermal insulation property decreased as the use of redispersible polymer powder increased, but the heat insulation property improved when using the appropriate amount.

• Annual Conference on Human and Language Technology
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• 2021.10a
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• pp.31-35
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• 2021

기계독해 시스템은 주어진 질문에 대한 답변을 문서에서 찾아 사용자에게 제공해주는 질의응답 작업 중 하나이다. 기존의 기계독해는 대부분 문서에 존재하는 짧고 간결한 답변 추출 문제를 풀고자 했으며 최근엔 불연속적인 범위를 추출하는 등의 확장된 문제를 다루는 데이터가 공개되었다. 불연속적인 답변 추출은 실제 애플리케이션에서 사용자에게 정보를 유연하게 제공해줄 수 있다. 따라서 본 논문에서는 기존의 간결한 단일 범위 추출에서 확장된 다중 범위 추출 시스템을 제안하고자 한다. 제안 모델은 문서를 구성하는 모든 토큰의 조합으로 구성된 Span Matrix를 통하여 다중 범위 추출 문제를 해결하고자 하며 실험을 통해 기존 연구들과 비교하여 가장 높은 86.8%의 성능을 보였다.

• Fire Science and Engineering
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• v.32 no.1
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• pp.40-45
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• 2018

It is considered that vermiculite as an inorganic material is highly effective when it is used as a building finishing material because it is eco-friendly. Vermiculite has excellent properties such as fire resistance, heat insulation, sound absorption as well as prevention of condensation, deodorization and aesthetics. In this study, we developed a finishing board with vermiculite as its main material and mixed with mineral loose wool (VB-L) or mineral powder (VB-P), and conducted fireproof test and insulation test. In addition, fire resistance tests were carried out by applying the two developed vermiculite boards as finishing materials for the standard wall details of light frame wood structures (KS F 1611-1). As a result of the fire resistance test, the VB-L specimen showed better fire resistance than the VB-P specimen. Both vermiculite boards showed sufficient fire resistance performance of 2 hours for a thickness of 30 mm.

• Fire Science and Engineering
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• v.31 no.2
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• pp.1-8
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• 2017

A sandwich panel is a composite material composed of a double-sided noncombustible material and insulation core which is used in the inner, outer walls, and roof structure of a building. Despite its excellent insulation performance, light weight and excellent constructability, a flame is brought into the inside of the panel through the joint between the panels, melting the core easily and causing casualties and property damage due to the rapid spread of flame. The current Building Law provides that the combustion performance of finishing materials for buildings should be determined using a fire test on a small amount of specimen and only a product that passes the stipulated performance standard should be used. This law also provides that in the case of finishing materials used for the outer walls of buildings, only materials that secured noncombustible or quasi-noncombustible performance should be used or flame spread prevention (FSP) should be installed. The purpose of this study was to confirm the difference between the dangers of horizontal and vertical fire spread by applying FSP, which is applied to finishing materials used for the outer walls of buildings limitedly to a sandwich panel building. Therefore, the combustion behavior and effects on the sandwich panel according to the application of FSP were measured through the construction to block the spread of flame between the panels using a full scale fire according to the test method specified in ISO 13784-1 and a metallic structure. The construction of FSP on the joint between the panels delayed the spread of flame inside the panels and the flash over time was also delayed, indicating that it could become an important factor for securing the fire safety of a building constructed using complex materials.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.28 no.1A
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• pp.89-94
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• 2008

The problem of interaction between the structures interconnected at discrete points as like composite structures, has a attracted considerable attention for a prolonged period of time. Recently, mixed structures are applied for overcoming structural limits by developed countries. In this paper, advanced connection type of mixed structures are presented by numerical approach. Also it is performed on extensive literature review from theoretical method to numerical analysis. For analysing behaviors of mixed structures according to connection type, 2 different connections and 1 reinforced connection are compared by 3D nonlinear numerical analysis. Nonlinear analysis of mixed structures is carried out by utilizing contact elements of a general purpose structural analysis computer program(ABAQUS). By using 6 criteria, each connections are investigated. From this result, proper reinforcing and well designed connection type are proposed. And results also show that the deflections which are induced by discontinuity on mixed structures, has a linear distribution that should decrease as applying proposed connection type.

• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.3
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• pp.330-337
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• 2021

3D printing is not only at the fundamental study and small-scale level, but has recently been producing buildings that can be inhabited by people. Buildings require a lot of cost and labor to work on the form work, but if 3D printing is applied to the building, the construction industry is received attention from technologies using 3D printing as it can reduce the construction period and cost. 3D printing technology for buildings can be divided into structural and non-structural materials, of which 3D printing is applied to non-structural materials. Because 3D printing needs to be additive manufacturing, control such as curing speed and workability is needed. Since cement mortar has a large shrinkage due to evaporation of water, cement polymer dispersion is used to improve the hardening speed, workability, and adhesion strength. The addition of polymer dispersion to cement mortar improves the tensile strength and brittleness between the cement hydrate and the polymer film. Cement mortar using polymer materials can be additive manufacturing but it has limited height that can be additive manufacturing due to its high density. When light-weight materials are mixed with polymer cement mortar, the density of polymer cement mortar is lowered and the height of additive manufacturing, so it is essential to use light-weight materials. However, the use of EVA redispersible polymer powder and light-weight materials, additional damage such as cracks in cement mortar can occur at high temperatures such as fires. This study produced a test specimen incorporating light-weight materials and EVA redispersible polymer powder to produce exterior building materials using 3D printing, and examined flame resistance performance through water absorption rate, length change rate, and cone calorimeter test and non-flammable test. From the test result, the test specimen using silica sand and light-weight aggregate showed good flame resistance performance, and if the EVA redispersible polymer powder is applied below 5%, it shows good flame resistance performance.

• Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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• 1989.06b
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• pp.60-69
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• 1989

안정성과 진동억제 특성이 요구되는 터어빈이나 모터등의 고속 회전기계에서는 틸팅-패드 저어널 베어링이 많이 사용되고 있다. 이는 틸팅-패드 저어널 베어링에서는 패드가 피봇이나 로울러로 지지되어 있으므로 윤활유막에서 발생하는 압력의 합력중심이 항상 이 지지점을 지나게 되어 베어링의 안정특성이 향상되기 때문이다. 틸팅-패드 저어널 베어링은 추력 베어링과 같이 불연속적인 윤활면을 갖는다. 그러므로 베어링의 입구부 선단에서 공급되는 윤활유의 충돌로 인한 압력격변이 일어나는데 이때 패드 입구부에서 발생하는 압력을 선단압력이라 한다. 이러한 선단압력으로 인한 베어링의 성능변화에 관한 연구는 주로 추력 베어링에 대하여 이론 및 실험적으로 수행 되어져 왔으며 그 결과들은 선단압력이 베어링의 성능에 미치는 영향을 무시할 수 없음을 보여주고 있다. 그러나 아직도 선단압력의 영향이 제대로 파악되고 있지 못하며, 특히 틸팅-패드 저어널 베어링에서 선단압력의 영향을 조사한 연구는 많이 부족한 실정이다. 그러므로 본 연구에서는 유한폭 틸팅-패드 저어널 베어링을 모델화한 실험장치를 설계 제작하여 선단압력을 포함한 유막내의 압력분포 및 유막두께를 연속적으로 측정함으로써 틸팅-패드 저어널 베어링의 성능에 미치는 선단압력의 영향을 실험적으로 조사하기로 한다.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.39 no.2
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• pp.169-177
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• 2015

Because technology of the sintering process is highly advanced, the gerotor used in the internal gear pumps of vehicles has advantages for manufacturing complex profiles and obtaining durability and minimization. However, it has been necessary to continuously improve the flow rate and noise of internal gear pumps for better fuel efficiency. The existing rotor was designed using a translation algorithm. This caused a discontinuity of the rotor profile, which had adverse effects on the performance. In this study, to improve the discontinuity of the profile, a new design program using a rotation and translation algorithm was developed, and two types of combined multiple profiles (three-ellipses and ellipse 1-involute-ellipse 2) were generated. Then, the performances (flow, flow rate, specific sliding, and pressure angle) of these profiles were calculated. On the basis of the calculation results for the performances, optimal designs of the two types were carried out and verified by comparing their performances with those of the existing rotor profiles.