• Proceedings of the Korean Geotechical Society Conference
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• 2006.10a
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• pp.312-333
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• 2006

This paper presents the results of an analysis of the excess porewater pressure distribution due to piezocone penetration in overconsolidated clays. From piezocone test results for moderately and heavily overconsolidated clays, it was observed that the excess porewater pressure increases monotonically from the piezocone surface to the outer boundary of the shear zone and then decreases logarithmically to the outer boundary of the plastic zone. It was also found that the size of the shear zone decreases from approximately 2.2 to 1.5 times the cone radius with increasing OCR, while the plastic radius is about 11 times the piezocone radius, regardless of the OCR. The equation developed in this study based on the modified Cam clay model and the cylindrical cavity expansion theory, which take into consideration the effects of the strain rate and stress anisotropy, provide a good prediction of the initial porewater pressure at the piezocone location. The method of predicting the spatial distribution of excess porewater pressure proposed in this study is based on a linearly increasing ${\Delta}u_{shear}$. In the shear zone and a logarithmically decreasing ${\Delta}u_{oct}$, and is verified by comparing with the excess porewater pressure measured in overconsolidated specimens at the calibration chamber.

• Proceedings of the Korea Information Processing Society Conference
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• 2001.10b
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• pp.1217-1220
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• 2001

우편물의 자동구분은 우편물을 OVIS(OCR-Video coding Integrated System)에 자동으로 공급하고 우편물의 수취인 주소영역을 카메라를 이용하여 획득한 다음 우편번호를 인식하여 바코드로 변환하여 인쇄하게 되고, 이 우편물은 LSM(Letter Sorting Machine)으로 보내져 BCR(Bar Code Reader)에 의해 인쇄된 바코드를 판독하여 행선지별로 구분하는 과정을 거친다. 주소의 번지 이하 부분은 배달원의 수작업에 의해 최종 배달지점 순서대로 정렬한 다음 배달하게 된다. 이 부분의 작업에 소요되는 시간은 배달원 일일 평균 4 시간에 달하며 원가절감 대상으로 지적되고 있다. 이 부분을 자동화하여 우편물 처리시간을 단축하고 생산성을 향상하는 방안이 대두되고 있으며, 이를 해결하기 위해 번지 부분까지 OCR을 이용, 인식하여 우편번호 및 순로 데이터 베이스에서 인식결과에 해당하는 코드를 추출하여 해당 구분 칸으로 우편물을 분류하는 방식을 택하면 집배원이 우편물을 배달하는 순로까지 자동으로 정렬할 수 있게 된다. 본 논문은 수취인 주소영역의 주소부분을 자동판독하기 위한 시스템을 개발한 내용을 다루고자 한다.

• IE interfaces
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• v.14 no.3
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• pp.247-254
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• 2001

As current postal automation is limited to dispatch and arrival sorting, delivery sequence sorting is performed manually by each postman. It not only acts as a bottleneck process in the overall mailing process but is expensive operation. To cope with this problem effectively, delivery sequence sorting automation is required. The important components of delivery sequence sorting automation system are sequence sorter and Hangul OCR which function is to extract the address of delivery point. DSI database will be interfaced to both Hangul OCR and sequence sorter for finding the accurate delivery sequence number and stacker number. The objectives of this research are to develop DSI(Delivery Sequence Information) database prototype and client application for managing information effectively. For database requirements collection and analysis, we draw all possible sorting plans, and apply the AHP(Analytic Hierarchy Process) method to determine the optimal one. And then, we design DSI database schema based on the optimal one and implement it using Oracle RDBMS. In addition, as address information in DIS database consist of hierarchical structure which has its correspondence sequence number, so it is important to reorganize sequence information accurately when address information is inserted, deleted or updated. To increase delivery accuracy, we reflect this point in writing application.

• 한국신재생에너지학회:학술대회논문집
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• 2011.05a
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• pp.158.2-158.2
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• 2011

DME is acronym of dimethyl ether, which is spotlighted as an ideal fuel to produce hydrogen due to its high hydrogen/carbon ratio, high energy density and easiness to carry. In this research, we calculated thermodynamic hydrogen (or syngas) yield from DME autothermal reforming and compared to other fuels. The reforming efficiency was about 80% above $700^{\circ}C$. Lower OCR has higher reforming efficiency but, it requires additional heat supply since the reactions are endothermic. SCR has no significant effect on the reforming efficiency. The optimized condition is $700^{\circ}C$, SCR 1.5, OCR 0.45 without additional heat supply. Comparing to other commercial gaseous fuels (methane and propane), DME has higher selectivity of $H_2O$ and $CO_2$ than the others due to the oxygen atom in the molecule. To apply DME autothermal reforming to real system, a proper catalyst is required. Therefore, it is performed the experiment comparing various novel metal catalysts based on CGO. Experiments were performed at calculated condition. The composition of product was measured and reforming efficiency was calculated. The catalysts have similar efficiency at high temperature(${\sim}800^{\circ}C$) but, CGO-Ru has the highest efficiency at low temperature ($600^{\circ}C$).

• Proceedings of the KIEE Conference
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• 2002.07a
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• pp.193-195
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• 2002

In this paper, a communication module is proposed to be applied to communication between over current relay (OCR) agents in multi agent protection system. A multi agent system can achieve a global goal beyond the ability of each individual agent by working together, in which it is the prerequisite for each agent to be able to exchange or share information or processing status with other agent. The proposed communication module is purposed to enable not only each agent to bring about its own goal, but also the whole protective system to provide much improved coordinated protection. It is applied to a self adaptive protection system for a distribution network using multi agent concept to show its effectiveness.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.13 no.5
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• pp.255-260
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• 1993

The behavior of pure silt was investigated by using an automated triaxial testing device. The stress-strain behavior of silt due to the volume deformation tendency was compared with the behavior of clay prior to failure and behavior at failure under monotonic undrained compression and extension conditions. A pure silica flour was chosen to form samples. The isotropically normally-consolidated samples with 450 kPa of effective mean confining pressure and overconsolidated samples through unloading were tested. Based on the experimental results, it was qualitatively identified that the undrained strength of normally-consolidated silt increases due to its dilatant nature which is not seen in clay. Also the overconsolidated silt shows a significantly different behavior under the monotonic loadings due to the volume deformation tendency.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.01a
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• pp.229-232
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• 2011

최근 스마트 디바이스 기반의 다양한 콘텐츠 제작 공급에 대한 새로운 마켓 시장 형성과 태블릿 디바이스 기반의 전자책 시장 규모의 확대에 따른 새로운 유형의 디지털 콘텐츠 시장이 형성되고 있다. 디지털 미디어는 정보환경 범위를 종이의 범위에서 벗어나 매체와 연계한 다양한 형태로의 변화뿐만 아니라 서술 방식과 소통방식의 방법에도 변화를 발생하였다. 그리고 지면에서 국한된 아날로그 매체의 물리적, 공간적, 시간적인 한계를 뛰어넘어 다양한 콘텐츠를 손쉽게 접근할 수 있게 만들었다. 이런 환경에서 본문검색 서비스는 아날로그와 디지털 매체의 상호 공존관계를 형성할 수 있다. 본 논문에서는 그림종이문서를 본문검색이 가능한 이미지형태의 디지털문서로 변환해주는 디지털라이징 시스템으로 문자위치정보를 포함하는 광학문자인식(OCR)기능과 인식된 문자의 오류를 수정하는 에디터기능을 통해 추출된 내용을 XML형태로 제공하는 본문검색 시스템을 제안한다. 특히, 문자인식 후처리 공정에서 복수의 관학문자인식(OCR)엔진을 통해 결과 비교와 문자위치 정보 확인 및 편집, 맞춤법 검사 등의 특화된 기능 등은 본 논문에서 가지는 강점으로 디지털문서 구축에 소요되는 시간과 비용을 혁신적으로 절감시켜준다.

• Proceedings of the Korean Society of Computer Information Conference
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• 2017.01a
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• pp.209-212
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• 2017

최근 정보통신기술의 비약적 발전에 따라 문서 제작 과정 또한 디지털 방식의 형태가 주를 이루게 되었다. 하지만 이와 더불어 문서를 통한 개인 정보 유출의 문제 또한 대두되게 되었다. 본 논문에서는 이미지 형식의 문서의 유출 방지를 위해 광학문자인식(OCR)을 활용한 문자인식 기능과 개인정보 검출 기능을 통합적으로 수행 한하여 기존 OCR엔진과의 차별점을 두었다. 또한 원하는 경로의 파일 탐색을 가능하도록 하고, 선택한 경로에 저장되어 있는 이미지파일 내의 검출 문자들을 정규표현식을 사용해 특정한 개인정보 패턴과 매칭하여 문서 내 포함된 개인정보를 반환하여 출력한다. 이러한 개인정보 검출 결과 중요 개인정보가 포함된 파일을 사용자에게 별도로 통보하도록 한다. 따라서 본 논문에서는 기존의 개인정보 검출 과정의 번거로움을 극복하여 사용자의 편의 향상과 더불어 문서를 통한 개인정보의 유출을 사전에 방지 할 수 있도록 하였다.

• Geotechnical Engineering
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• v.14 no.5
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• pp.77-88
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• 1998

This study discusses the engineering characteristics and distribution of marine clay in Pohang by providing evidence that Pohang area has been upheaving in connection with the changes of sea level and geographical development in the Babt Coast. It is estimated that the sea level of the East Coast about 10,000 years ago had been 25 meters below than that of the present. The corroborative fact is that the marine clay deposited below the sea level due to the changes of the crust in Pohang is usually found above the sea level. Judging from their OCR values of leas than 0.77 and Bu/po'ratio of less than 0.14 at the depth of 7.8 meters below the ground level, marine clays of Dohu 1-dong and Jangsung-dong in Pohang City are presumed to be in a state of underconsolidation. However, more sophisticated measures and analysis are needed to prove it.

• Proceedings of the KIEE Conference
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• 2008.07a
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• pp.484-485
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• 2008

A micro-grid (MG) is a new concept to aggregate distributed generations (DGs) and loads in a small area. The difference between MG and DG is that MG can supply power to loads even in islanding conditions. The magnitude of the fault current depending on interconnection between the MG and utility and the number of DGs in the MG. Therefore, the setting value of the OCR must be changed depending on operating conditions of the MG. This paper proposes the over-current relay considering operating conditions of the MG. In the proposed algorithm, the supervisory control and data acquisition decides the operating conditions of the MG and sends the proper setting values to each OCR. The performance of the algorithm was investigated in the case of the various operating conditions.