• Asian Pacific Journal of Cancer Prevention
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• 제13권11호
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• pp.5747-5752
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• 2012

Purpose: The main objective of the present study was to evaluate the efficacy and toxicity of concurrent chemoradiotherapy followed by adjuvant chemotherapy compared with concurrent chemoradiotherapy alone in the treatment of locoregionally advanced nasopharyngeal carcinoma. Methods: The search strategy included Pubmed, Embase, the Cochrane Library, China National Knowledge Internet Web, Chinese Biomedical Database and Wanfang Database. We also searched reference lists of articles and the volumes of abstracts of scientific meetings. Randomized controlled trials (RCTs) that compared concurrent chemoradiotherapy followed by adjuvant chemotherapy with concurrent chemoradiotherapy alone in locoregionally advanced nasopharyngeal carcinoma were included. Meta-analysis was performed with RevMan 5.1.0. The Grading of Recommendations Assessment, Development, and Evaluation system (GRADE) was used to rate the level of evidence. Results: Five studies were included. Risk ratios of 1.02 (95%CI 0.89-1.15), 0.93 (95%CI 0.72-1.21), 1.07 (95%CI 0.87-1.32), 0.95 (95%CI 0.80-1.13) were observed for 3 years overall survival, 5 years failure-free survival, 5 years locoregional failure-free survival and 5 years distant metastasis failure-free survival. There were no treatment-related deaths in both groups of five studies. Hematologic and gastrointestinal toxicity were the most significant for patients during adjuvant chemotherapy. The level of evidence was low. Conclusion: Compared with concurrent chemoradiotherapy alone, concurrent chemotherapy followed by adjuvant chemotherapy did not improve prognosis. More toxicity was found during adjuvant chemotherapy.

• 한국전자거래학회지
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• 제1권1호
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• pp.141-157
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• 1996

Data sharing is a major challenge to implement CALS. STEP is the international standard for the product model data exchange among heterogeneous systems and plays a key role in CALS. Advances in computer networks are rapidly changing the product development processes. The network oriented modeling system premises to integrate design activities across the enterprise. To achieve goals of CALS 3-dimensional concurrent modeling that complies international standard is required since integrity and common perception of product data can be assured. This paper presents 3-dimensional concurrent geometric modeling on high speed network using STEP and methodologies.

• International Journal of Quality Innovation
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• 제8권2호
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• pp.115-131
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• 2007

The vehicle development process (VDP) is iterative in nature with numerous interactions and information flows between design groups and between development phases. The VDP has been changed from a sequential-functional development to a concurrent-team based approach. Concurrent execution of design activities may reduce the development lead-time, but it increases the managerial complexity in the VDP. A system dynamics model was developed to understand the transient behavior of parallel, overlap, and sequential processes in the VDP and to determine the optimal level of overlapping considering the development lead-time and total number of reworks. The simulation results showed that different execution processes should be used, depending upon the intensity of reworks.

• 한국경영과학회:학술대회논문집
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• 대한산업공학회/한국경영과학회 1996년도 춘계공동학술대회논문집; 공군사관학교, 청주; 26-27 Apr. 1996
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• pp.689-692
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• 1996

The environment surrounded by industries is represented by the 3Cs : Customers, Competition, and Changes. The 3Cs drive industries to pursue external business targets such as customer's needs and marketplaces with BPR (Business Process Reengineering). BPR addresses core business process. One of these core business processes is product development. This product development process has been reengineered by the concept of CE (Concurrent Engineering). The aim of the paper is to build frameworks of CE to clarify the CE concept. This paper begins with investigating the product development process from the perspectives of three drivers: cost, quality and speed. CE frameworks are then followed. The first frmework is concerned with the CE definition and thus three keyphrases are extracted : from the outset, concurrent design and systematic approach. Concerned with the CE implementation, the second framework is composed of five components: generalist & specialist, cross-function team, enabling tools & techniques, success metrics, and total visibility. This paper concludes that the CE practice is hard to achieve because of the 'dont't-tell-them-early' attitude of upstream people, and the 'wait-and-see' attitude of downstream people. As resolution, a change management program is recommended that changes an employees mind-set. This paper also supposes computer systems which facilitate and keep automatic track of the CE process as engineered. Finally it gives a warning that computer systems alone do not guarantee success without being preceded by process re-engineering.

• 산업경영시스템학회지
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• 제32권1호
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• pp.102-110
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• 2009

Concurrent Engineering(CE) has presented new possibilities for successful product development by incorporating various product life-cycle functions from the earlier stage of design. In the product design, geometric representation is vital not only in its traditional role as a means of communicating design information but also in its role as a means of externalizing designer's thought process by visualizing the design product. During the last dozens of years, there has been extraordinary development of computer-aided tools intended to generate, present or communicate 3D models. However, there has not been comparable progress in the development of 3D-CAD systems intended to represent and manipulate a variety of product life-cycle information in a consistent manner. This paper proposes a novel concept, Minus Volume (MV), to incorporate various design information relevant to product lift-cycle functions. MV is a functional shape that is extracted from a design object within a bounding box. A prototype 3D-CAD system is implemented based on the MV concept and illustrated with the successful implementation of concurrent design and manufacturing.

• 한국자동차공학회논문집
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• 제1권3호
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• pp.83-94
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• 1993

Design and production of wiring for automobile systems provide the background for the development of concurrent engineering framwork. Key issues include with different parts of the wiring design process and the development of hierarchical representations that capture the different characteristics(e.g., connectivity, geometry) of the harnesses. The abstraction of design information results in features, while the abstraction of operations leads to the development of agents. These abstracts are essential for efficient transactions among people and computer tools in a domain that involves numerous interacting constraints. We have decomposed the wiring design process into four basic categories of tasks that are each addressed by an "agent" : the Environment Editor(EE), the Free Space Manager(FSM), the Wiring Editor(WE), and the Part Selector(PS). In this paper the strategy for the problem decomposition, the definition of features, and the ways in which features are used by various agents, are discussed. We conclude with a discussion of some of the issues raised by the project and the steps underway to address them.

• 한국건설관리학회논문집
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• 제8권6호
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• pp.197-206
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• 2007

지금은 '개발기간 단축, 고품질'을 위한 종합적인 대처를 요하는 시대이다. 제품은 점차 복잡화되고 그 종류 또한 다양화되어 가는 반면 제품의 생애주기(Life Cycle)는 축소되고 있다. 이러한 무한경쟁시대에 있어 적자생존의 확실한 해답은 기업스스로 개발기간 및 납기를 단축시키고 제품개발에 앞장서며, 제품의 생애주기 원가를 절감시켜 성능과 가치 양면을 동시에 고객에게 감동 줄 수 있는 품질을 확보하는 데에 있다. 이와 같은 측면에서 프로세스의 각 공정을 동시 병행적으로 개발하는 '동시공학'은 건설에 있어 중요한 개념으로 인식되고 있다. 본 연구는 동시공학을 성공적으로 적용하기 위하여 문헌 및 여러 가지 사례를 조사, 분석하고 그것들이 각 프로세스에 미치는 영향을 시뮬레이션 실행을 거쳐 의사결정 모델로 제시한다.

• 한국인터넷방송통신학회논문지
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• 제11권4호
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• pp.147-156
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• 2011

소프트웨어 프로젝트를 개발하는 방법론에는 20여 가지의 개발 프로세스 모델들이 존재한다. 그러나 모든 소프트웨어의 특성을 만족시킬 수 있는 일반화된 하나의 모델이 없는 실정으로 개발조직은 여러 모델들을 적절히 혼합하여 개발될 시스템과 개발팀의 능력에 맞도록 새로운 모델을 개발하여야만 한다. 본 논문에서는 다양한 소프트웨어 개발 상황에 보다 적합할 것으로 판단되는 동시개발 프로세스 모델을 제안한다. 먼저, 개발 요구사항 목록들이 작성되면, 요구사항을 중요도에 따라 20:80 비율로 분할하고, 중요한 20% 요구사항의 요구사항 분석과 아키텍쳐 설계가 완료될 때까지는 순차적으로 수행한다. 20%의 중요 요구사항에 대해 상세설계를 시작하는 시점에서 나머지 80%의 요구사항에 대한 요구사항 분석단계를 동시에 수행하는 개념이다. 동시개발은 타임박스(Timebox) 개념으로 수행되며, 이때 적용되는 순차적, 반복적 & 점진적 또는 Agile 방법들에 따라 각 타임박스에서 개발되는 요구사항의 분할 비율은 차이가 발생한다. 순차적, 반복적 & 점진적 또는 Agile 방법론을 동시개발 개념을 적용한 결과 단일화된 프로세스 모델로 표현할 수 있었다. 제안된 모델은 개발 단계들을 팀 단위로 수행할 경우 개발자원 활용의 비효율성을 크게 줄일 수 있다. 또한, 동시개발 개념을 적용하여 단계들이 중첩되어 수행되므로 개발기간도 크게 단축시키는 장점이 있다. 따라서 제안된 모델은 보다 빠른 시간에 보다 저렴한 비용으로 보다 좋은 품질의 소프트웨어를 개발하여 고객에게 납품할 수 있어 고객을 만족도를 향상시킬 수 있으며, 더불어 소프트웨어 개발 성공률을 높이는데도 기여할 것으로 판단된다.

• 산업공학
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• 제8권3호
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• pp.39-45
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• 1995

제조시스템 시뮬레이션 분석과정에서 모델 검증, 엔지니어와의 커뮤니케이션 및 시뮬레이션 결과의 프리젠테이션을 위해 이제 그래픽 애니메이션은 시뮬레이터의 기본 필수 사양으로 자리잡고 있다. 본고에서는 사용자의 손쉬운 모델링 과정을 지원하는 사용자 모델러(User Modeler)와 실시간 애니메이션(Concurrent Animation) 수행을 지원하는 시뮬레이터용 애니메이션 모듈 개발에 관해 논의한다.

• 지능정보연구
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• 제1권1호
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• pp.73-89
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• 1995

전문가시스템이 등장한지도 근 20년이 흘렀고 다양한 분야에서 기업의 중추적 시스템으로 운영되고 있다. 이렇게 전문가시스템이 연구단계에서 벗어나 실용화됨에 따라 전문가시스템의 개발방법에 대한 연구가 학계가 산업계가 새로운 연구과제로 인식되고 있다. 지금까지 개발에 대한 연구는 주로 지식획득 기술의 개발에 치중되어있다. 본 논문에서는 전문가시스템의 개발에 대한 방법론적 접근방법이 제시된다. 이 접근벙법은 시간과 인력 등 자원의 제약을 받는 전문가시스템 개발프로젝트에 적합한 것으로 동시공학(Concurrent Engineering)개념을 채택하고 있으며 개발 라이프사이클 모델, 프로젝트팀 구성방법등을 다루고 있다. 또한, 동시공학적 접근방법을 지원하기 위한 분석과 설계방법으로는 객체지향기술을 사용하며 개발단계별로 해당 모델이 산출물로 구축된다.