• 한국환경복원기술학회지
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• 제3권3호
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• pp.113-125
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• 2000

This study was carried out to introduce current status and development strategy for an environmental restoration of stream side in Japan, and to consider a methodology which could be effectively applied for the environmental restoration of stream side in Korea. The strategy prospects of environmental restoration in Japan were summarized as follows : 1. When we establish the long term erosion control planning, we should make detail planning after considering of a certain block of watershed units. Because most of the disaster is caused by soil movement which was occurred by water contents. 2. Nowadays, the general torrent erosion control planning system in Japan focused on reducing the sediment such as by placement of erosion control facility and by restoration of afforestation, after calculation of several factors including expected amount of sediment, and the different amount of planned sediment and allowable sediment. 3. In the past, the goal of forest conservation and erosion control planing was to fix the amount of soil movement by construction of permanent facilities. While, the goal of forest conservation and erosion control planning in the future needs to change the techniques to a small and middle scale's soil movement which could prevent soil movement from large scale of soil disasters, but allow soil movement effectively. Also, it is considered to change erosion control dams from non passing type to passing type. 4. Restoration of stream-side ecology, erosion control for the conservation of ecology should be planned and conducted cautiously based on concepts of ecology conservation and development of environmentally sound techniques.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2001년도 ICCAS
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• pp.149.2-149
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• 2001

In this paper, we present an agent-based transportation routing method in a semi-conductor production line. The main characteristic of the proposed method is that each AGV agent individually searches candidates of its route with reference of the pheromone information based on the use of an analogy of Ant System. The proposed method is applied to several routing problems. The performances of the proposed method are compared with those of a Genetic Algorithm. The effectiveness of the proposed method is conrmed by many numerical examples. In order to demonstrate the effectiveness of the proposed method for an actual problem, the proposed method is applied to a dynamic motion planning. The proposed method ...

• Corrosion Science and Technology
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• 제11권2호
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• pp.43-47
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• 2012

Recently, regulatory bodies quite often encourage to adopt risk-based inspection (RBI) and management programs because they can enhance safety simultaneously with deregulation in Korea. RBI is an integrated methodology that factors risk into inspection and maintenance decision making. This paper describes an example of how to use known risk assessment codes (API 580, API 581 BRD) to address such safety analysis requirements for risk management in the refining industry. Specifically, this paper reports the methodology and the results of implementation to the Crude Distillation Unit(CDU) plant of refinery units using the $KGS-RBI^{TM}$ program, developed by the Korea Gas Safety Corporation in reference of API Codes and ASME PC (Post Construction) with a suitable consideration of Korean situation. The results of the risk and reliability assessment using $KGS-RBI^{TM}$ program are useful in determining whether the detected defects are tolerable or required to be repaired. The subsequent decisions are to manage the future inspection, repair and maintenance planning in the risk reduction control.

• 한국정밀공학회지
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• 제10권4호
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• pp.30-41
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• 1993

Developed in this paper is a feature based modeling system for the design of welded plat construction(WPC) which is composed of flat or bended plates represented as reference plane with a constant thickness. First, the necessity and the characteristics of the modeing system for WPC as compared with the assembly of mechanical parts are investigated. Secondly, feature library for the assembly of WPC is shown which contains several types of features like joint feature, groove feature, material feature, and precision feature. Thirdly, the assembly procedures are presented which mainly consist of both the assembly transformation and the correct assembly checking. Fourthly, weld lines of the assembled WPC are defined so that those can be used in the process planning or the manufacturing stage. Finally, a prototype by a geometric modeling software Pro/Engineer, a graphic software GL(Graphic Library), and C language on a CAD workstation IRIS.

• 대한조선학회논문집
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• 제45권4호
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• pp.441-454
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• 2008

Shipyard design and equipments layout problem, which are directly linked with the productivity of ship production, is an important issue serving as reference data of production plan for later massive production of ships. So far in many cases, design of a shipyard has been relying on the experienced engineers in shipbuilding, resulting in sporadic and poorly organized processes. And thus, economic losses as well as trials and errors in that accord have been pointed out as inevitable problems. This paper extracts a checklist of major elements to fine tune the shipbuilding yard designing process and the input/output data based on the simulation based shipbuilding yard layout designing framework and methodology proposed in existing researches, and executed initial architecture to develop software that integrates all the relevant processes and designing tools. In this course, both user request and design data by the steps are arranged and organized in the proposed layout design template form. In addition, simulation is done based on the parent shipbuilding process planning and scheduling data of the ship product, shipbuilding process and work stage facilities that constitute shipbuilding yard, and design items are verified and optimized with the layout and equipment list showing optimal process planning and scheduling effects. All the contents of this paper are based on simulation based shipbuilding yard layout designing methodology, and initial architecture processes are based on object oriented development methodology and system engineering methods.

• Maxillofacial Plastic and Reconstructive Surgery
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• 제38권
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• pp.49.1-49.9
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• 2016

Background: The aim of this report is to present a new reference for aesthetic mandible surgery using three-dimensional cone-beam computed tomography-based treatment planning for orthognathic surgery which can be implemented in surgical planning and perioperative procedure. Methods: To make an objective standard for evaluating aesthetic mandibular outline, we make an aesthetic scoring criteria with consideration of asymmetry, broad mandibular border line, and prominent mandibular angle. Two maxillofacial surgeons and two orthodontists rated their aesthetical evaluation from 1 to 5. Experimental group consisting of 47 female and 38 male patients who had rotational orthognathic two-jaw surgery from 2010 to 2011 were chosen according to aesthetic scoring done by two maxillofacial surgeons and two orthodontists. A high aesthetic score (${\geq}16$) means the facial contour is symmetric, with no broad and narrow aesthetic mandible frontal profiles. Control A group consisted of ten female and ten male patients who had no orthognathic surgery experience and low aesthetic score (${\geq}10$). Control B group consisted of ten female and ten male patients who had no orthognathic surgery experience and had anaesthetic mandibular frontal profile and a high aesthetic score (${\geq}16$). The three-dimensional image of the patient was taken from dental cone-beam CT (DCT) scanning (experimental group and control A group: 6 months DCT after surgery, control B group: 1st visit DCT). Each DCT was reformatted to reorient the 3D image using 3D analyzing program (OnDemand3D, cybermed Inc, CA, USA). After selection of 12 landmarks and the construction of reoriented horizontal, vertical, and coronal reference lines, 15 measurements were taken in 3D analysis of frontal mandibular morphology. Afterwards, horizontal and vertical linear measurements and angular measurements, linear ratio were obtained. Results: Mean $Go^{\prime}_{Rt}-Me^{\prime}-Go^{\prime}_{Lt}$ angular measurement was $100.74{\pm}2.14$ in female patients and $105.37{\pm}3.62$ in male patients. These showed significant difference with control A group in both genders. Ratio of $Go^{\prime}_{Rt}-Go^{\prime}_{Lt}-Me^{\prime}$ length to some linear measurements (ratio of $Me^{\prime}-Cd^{\prime}_{Rt}Cd^{\prime}_{Lt}$ to $Me^{\prime}-Go^{\prime}_{Rt}Go^{\prime}_{Lt}$, ratio of $Me^{\prime}-Go^{\prime}$ to $Me^{\prime}-Go^{\prime}_{Rt}Go^{\prime}_{Lt}$, ratio of $Go^{\prime}_{Rt}-Go^{\prime}_{Lt}$ to $Me^{\prime}-Go^{\prime}_{Rt}Go^{\prime}_{Lt}$) showed significant difference with control A group in both genders. Conclusion: This study was intended to find some standard measurement of mandible frontal view in 3D analysis of aesthetic patient. So, these potential measurement value may be helpful for orthognathic treatment planning to have more aesthetic and perspective outcomes.

• 한국환경생태학회지
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• 제20권2호
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• pp.235-258
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• 2006

청계천 복원공사 전(2003) 중(2004) 후(2005)의 수질과 식물 및 식생모니터링결과 청계천의 수질등급은 공사 전에는 $BOD_5$가 평균 51.1mg/L로서 등급 외이었으나, 공사 후에 한강수와 지하철 역사의 물이 공급되면서 $BOD_5$가 3.3mg/L로 낮아져 수질이 3등급으로 향상되었다. 식물의 경우는 공사 전에 총 121종에서 공사후에 132종으로 다소 증가하였다. 특히 다년초의 비율이 공사 전 24.8%에서 공사 후 35.6%로 증가되었으며, 갈대군락과 잔디군락이 도입식생으로 관찰되었다. 그러나 공사구간은 공사 전 우점 군락이었던 식생보전등급 1인 환삼덩굴과 망초군락이 여전히 우세하여 식물의 생태성은 공사전과 후의 변화가 크지 않았다. 또한 이 같은 조사내용을 비교대상구간과 비교하면 비교대상구간의 수질은 $BOD_5$ 0.8mg/L인 1등급으로 공사구간보다 양호하고, 식물종수도 154종으로 공사구간보다 다양할 뿐 아니라 귀화식물의 비율은 13%로서 공사구간의 28.8%보다 낮았다. 따라서 현재까지는 공사구간이 비교대상구간보다 생태적으로 떨어지는 것으로 평가된다. 그러나 하천복원이란 장기적이며 복합적인 과정으로서 본 연구 에서와 같은 단기조사만으로 복원의 효과성을 논할 수 없으며, 앞으로 장기간에 걸친 다른 주요항목에 대한조사도 병행되어야만 청계천 복원의 효과성을 검증할 수 있을 것이라고 사료된다.

• 기술혁신연구
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• 제20권3호
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• pp.93-128
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• 2012

국방 기술기획은 미래 국방목표 달성을 위한 중 장기적 핵심기술을 식별하고, 향후 연구개발을 위한 전략을 제시한다. 향후 수출주도형 방위산업을 육성하기 위해서는 무기체계 중심의 기술지향형 기술기획에서 시장지향성 연구개발로 기획 패러다임을 전환하여야 한다. 본 논문은 현재 국방기술품질원에서 추진 중인 '사전 기술기획'을 전략적으로 지원하기 위해 연구되었다. 연구내용은 국방 R&D 기획과 시장지향성의 선행연구 자료조사, 세계 방산시장 분석 현황 및 시장성 분석, 무기체계 시장성 평가모델과 공격용 무인기 사례 분석으로 시장매력도 등을 평가하여 시장 개척방안, 장비 경쟁력 제고 방안 등을 도출하였다. 연구된 무기체계 시장성 평가모델은 소요요청 계획 수립 및 검증 시 사업추진 우선순위 등에서 의사결정을 위한 합리적인 기준요소로서 유용한 참조자료가 될 수 있을 것으로 판단된다. 특히 향후 이러한 마케팅 관점의 시장지향성 국방 R&D 기획 프로세스가 제도적으로 정립된다면 기획 단계부터 장비별 맞춤형 수출전략을 수립하고, 체계적으로 마케팅을 지원하기 위한 전략적 접근이 가능할 것으로 판단된다.

• 한국지리정보학회지
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• 제5권2호
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• pp.81-90
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• 2002

원격탐사는 상대적으로 적은 비용으로 넓은 지역에 대해 최신의 정보를 광범위하게 제공하며 지리정보의 갱신 및 도시변화 관찰에 있어 전통적인 방법(실측, 사진측량 등)에 비해 커다란 장점을 지니고 있으나, 현재까지는 공간 해상도의 한계로 인해 제한된 분야에서만 활용되어 왔으나 공간해상도 1m급의 위성영상이 상용화되고 있는 현 시점에서 위성영상의 활용방법에 대한 연구가 매우 시급하다 할 것이다. 본 연구의 목적은 다시기 위성영상을 이용해 도시지역의 성장변화를 모니터링 할 수 있는 방법을 고찰하는 것이다. 즉, 특정년도의 영상에서 추출하고자 하는 특정지표요소의 분광특성을 이용하여 개개 지표요소가 픽셀에서 차지하는 비율을 SMA알고리즘을 적용하여 개개 지표요소의 분류영상을 생성하여, 도시지역을 추출하고, 이 방법을 다시기 영상에 적용하여 변화가 일어난 지역을 추출하는 것이다. 이러한 방법으로 도시지역의 성장변화를 관찰하는 알고리즘 연구와 도시성장변화를 모니터링 하는 연구에 원격탐사자료의 활용가능성을 제시하고자 한다.

• Journal of Positioning, Navigation, and Timing
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• 제11권4호
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• pp.327-332
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• 2022

The Korea Augmentation Satellite System (KASS) is the Satellite-Based Augmentation System (SBAS) under development in Korea. KASS navigation service support navigation Safety of Life (SoL) service. KASS signal provides corrections to Global Positioning System (GPS) data received from KASS Reference Stations (KRS) and is broadcast form Geostationary Earth Orbiting (GEO) satellites to KASS users and is used by GPS/SBAS user equipment to improve the accuracy, availability, continuity and integrity of the navigation solution. Seven KRS's collect the satellite data and send them to the KASS Processing Stations (KPS) for the generation of the corrections and the monitoring the integrity. For performing its computation the KPS needs to know accurate and reliable KRS antennas coordinates. These coordinates are provided as configuration parameters to the KPS. This means that the reference frame in which the KPS work is the one represented by the set of coordinates provided as input. Therefore, the activity to maintain the accuracy of the KRS antenna coordinates is necessary, knowing that coordinates can evolve due to earth plates movements or earthquakes. In this paper, we analyzed the geodetic survey results for KRS antenna coordinates from Site Acceptance Test (SAT) #1 in December 2020 to August 2022. In the future, it is expected that these activities and planning for KRS coordinates maintenance will be produced and provided to KASS system operators for KPS configuration updates during the KASS lifetime of 15 years. Through these maintenance activities, it is expected that monitoring and analysis of unpredictable events such as earthquakes and seism will be possible in the future.