• 국제학술발표논문집
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• The 5th International Conference on Construction Engineering and Project Management
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• pp.648-651
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• 2013

The information generated in large-scale and complex construction projects are transferred continuously and transformed into project products on the long span life cycle. Therefore, information flow management is related with the success of project directly. However, certain characteristics of large-scale and complex construction projects make the solving the problem more difficultly. Although several information retrieval systems support the information management system, it is not suitable to grasp information flows. Hence, we developed an information retrieval system specialized with the information flow based on a preceding research. The system consists of a relation-based database and the process information transferring relation inference application module. The system enables project managers to manage the entire project process more efficiently and each project member to work their own task being served the information flow retrieval results.

• 산업경영시스템학회지
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• 제44권3호
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• pp.22-32
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• 2021

To meet rapidly changing market demands, manufacturers strive to increase both of productivity and diversity at the same time. As a part of those effort, they are applying flexible manufacturing systems that produce multiple types and/or options of products at a single production line. This paper studies such flexible manufacturing system with multiple types of products, multiple Bernoulli reliability machines and dedicated buffers between them for each of product types. As one of the prevalent control policies, priority based policy is applied at each machines to select the product to be processed. To analyze such system and its performance measures exactly, Markov chain models are applied. Because it is too complex to define all relative transient and its probabilities for each state, an algorithm to update transient state probability are introduced. Based on the steady state probability, some performance measures such as production rate, WIP-based measures, blocking probability and starvation probability are derived. Some system properties are also addressed. There is a property of non-conservation of flow, which means the product ratio at the input flow is not conserved at the succeeding flows. In addition, it is also found that increased buffer capacity does not guarantee improved production rate in this system.

• 시스템엔지니어링학술지
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• 제5권2호
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• pp.63-69
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• 2009

For the effective and efficient system development, it is provided of complex and diverse disciplines, analysis and design, points of views for decisions making, technical information management, assurance of products, and so on to be integrated and ensured. Systems engineering is conducted through a process and is implemented by tools based on relevant methodologies. Systems engineering environment should be provided to support the systems engineering process, method, and tools used on the project. In this paper, the essential environment in performing works in a organization applying systems engineering on the basis of system life cycle was reviewed. The present states on establishment of the systems engineering in Korea Railroad Research Institute were also examined with some reviews of other cases.

• 한국압력기기공학회 논문집
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• 제10권1호
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• pp.96-99
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• 2014

The aim of the study was to evaluate the water treatment of pressurized water reactor secondary side by the mixed amine of ammonia and ethanolamine, from the standpoint of corrosion control, as compared with all volatile treatment of ammonia. The pressurized water reactor systems have switched a secondary side pH control agent to minimize the corrosion in the moisture separator/reheater and feedwater heater systems and the transport of corrosion products into steam generator. As results of field test, pH was increased in the steam generator and the wet steam area of moisture separator/reheater and the concentration of Fe were decreased by more than 50% as compared with water treatment of ammonia.

• 셀메드
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• 제6권4호
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• pp.22.1-22.19
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• 2016

The biologically active compounds derived from different natural organisms such as animals, plants, and microorganisms like algae, fungi, bacteria and merine organisms. These natural compounds possess diverse biological activities like anthelmintic, antibacterial, antifungal, antimalarial, antiprotozoal, antituberculosis, and antiviral activities. These biological active compounds were acted by variety of molecular targets and thus may potentially contribute to several pharmacological classes. The synthesis of natural products and their analogues provides effect of structural modifications on the parent compounds which may be useful in the discovery of potential new drug molecules with different biological activities. Natural organisms have developed complex chemical defense systems by repelling or killing predators, such as insects, microorganisms, animals etc. These defense systems have the ability to produce large numbers of diverse compounds which can be used as new drugs. Thus, research on natural products for novel therapeutic agents with broad spectrum activities and will continue to provide important new drug molecules.

• 시스템엔지니어링학술지
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• 제8권2호
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• pp.19-25
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• 2012

As modern weapon systems have evolved into embedded software systems, the capability to develop, install, and maintain high-quality software products is becoming increasingly valuable in today's competitive aerospace and defense industry. It is desirable, especially for government-contracted projects whose end-users are military personnel, that specific types of software quality elements are assured early during product development; namely, functionality and usability. Motivated by this need to approach improving software quality from a user's perspective, this paper presents a case study that analyzes system-level software integration testing results for a weapon system indigenously developed in the Republic of Korea. Quantitative data, such as software defect ratios and configuration change rates, are computed to observe meaningful trends with respect to functionality - represented by tests designed to verify the system's electrical signal interfaces - and usability, which is evaluated in terms of how often the initial human-computer interface had to be re-designed. Insights gained from these exercises are subsequently presented as a set of "lessons learned" to take into account when developing new software items for complex weapon systems.

• Bulletin of the Korean Chemical Society
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• 제21권9호
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• pp.923-928
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• 2000

[FeIII(BBA)DBC]ClO4 as a new functional model for catechol dioxygenases has been synthesized, where BBA is a bis(benzimidazolyl-2-methyl)amine and DBC is a 3,5-di-tert-butylcatecholate dianion.The BBA complex has a structuralfeature that iron cent er has a five-coordinate geometry similar to that of catechol dioxygenase-substrate complex.The BBA complex exhibits strong absorptionbands at 560 and 820 nm in CH3CN which are assigned to catecholate to Fe(III) charge transfer transitions. It also exhibits EPR signals at g = 9.3 and 4.3 which are typical values for the high-spin FeIII (S = 5/2) complex with rhombicsymmetry. Interestingly, the BBA complex reacts with O2 within an hour to afford intradiol cleavage (35%) and extradiol cleavage (60%) products. Surprisingly, a green color intermediate is observed during the oxygenation process of the BBA com-plex in CH3CN. This green intermediate shows a broad isotropic EPR signal at g = 2.0. Based on the variable temperature EPR study, this isotropic signalmight be originated from the [Fe(III)-peroxo-catecholate] species havinglow-spin FeIII center, not from the simple organic radical. Consequently,it allows O2 to bind to iron cen-ter forming the Fe(III)-superoxide species that converts to the Fe(III)-peroxide intermediate. These present data can lead us tosuggest that the oxygen activation mechanism take place for the oxidative cleavingcatechols of the five-coordinate model systems for catechol dioxygenases.

• 한국통신학회논문지
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• 제35권11B호
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• pp.1710-1714
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• 2010

현대의 첨단 무기체계는 다양한 성능과 기능의 필요에 의해 사용자 (무기운용자 포함) 요구사항이 복잡해지고 있다. 이로 인해 방위사업청 훈령 제 65호에서는 무기체계 개발 시 시스템공학의 적용을 강제 사항으로 규정하고 있다. 하지만 시스템공학에서 수행해야 하는 업무가 다양하고 각 단계별 산출물이 많다. 국내의 많은 방위산업관련조직 (국방부, 방위산업체, 각 연구소) 들에서 시스템공학에 대한 성숙도와 관점의 차이가 있다. 시스템공학 산출물이 사업 성공의 핵심적인 역할을 해야 함에도, 사업과 다른 하나의 일로 생각하는 경우가 많다. 본 연구에서는 국방획득사업에서 시스템공학의 적용에 대한 핵심 요소에 대한 내용을 분석 정리하고 또한 각 단계 산출물의 사이의 추적성을 도출하였다. 본 연구 결과를 통해서 방위산업 관련 조직의 공통적인 시각을 제시하고 통합함으로써 국방획득사업에서 예산 초과 및 개발기간 지연 등의 요소를 제어함으로써 사업에서의 위험 요소를 감축시키는 데에 도움이 되도록 하였다.

• International journal of advanced smart convergence
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• 제12권3호
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• pp.1-12
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• 2023

A public address (PA) system installed in a building is a system that delivers alerts, announcements, instructions, etc. in an emergency or disaster situation. As for the products used in PA systems, with the development of information and communication technology, PA products with various functions have been introduced to the market. PA systems recently launched in the market may be connected through a single network to enable efficient management and operation, or use voice recognition technology to deliver quick information in case of an emergency. In addition, a system capable of locating a user inside a building using a location-based service and guiding or responding to a safe area in the event of an emergency is being launched on the market. However, the new PA systems currently on the market add some functions to the existing PA system configuration to make system operation more convenient, but they do not change the complex PA system configuration to reduce facility costs, maintenance, and management costs. In this paper, we propose a novel PA system configuration for buildings using audio networks and control hierarchy over peer-to-peer (Anchor) technology based on audio over IP (AoIP), which simplifies the complex PA system configuration and enables convenient operation and management. As a result of the study, through the emergency signal processing algorithm, fire broadcasting was made possible according to the detection of the existence of a fire signal in the Anchor system. In addition, the control device of the PA system was replaced with software to reduce the equipment installation cost, and the PA system configuration was simplified. In the future, it is expected that the PA system using Anchor technology will become the standard for PA facilities.

• 한국산학기술학회논문지
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• 제21권5호
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• pp.28-38
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• 2020

반도체 증착장비는 일반적인 대량생산 제품과는 차별화되는 특징을 보이는 복합제품시스템(CoPS)의 주요 예시 중 하나로, 사용자 요구에 대한 충실한 이해가 필수적이다. 이에 본 연구에서는 Kano 모델을 활용하여 증착장비의 품질속성에 대한 사용자와 생산자의 만족 특성을 비교분석하고자 하였다. 사용자 및 생산자 기업의 엔지니어와 관리자들을 대상으로 Kano 설문을 수행하고 분석한 결과, 사용자 측과 생산자 측의 품질 만족 특성이 다르게 나타났다. 총 22개의 소분류 품질속성 가운데, 제조사 측은 22개 모두에 대해 매력적(A) 품질속성으로 평가한 반면, 사용자 측에서는 A 6개, 무관심(I) 10개, 당연적(M) 2개, 기타 경계치값 2개 등으로 평가하여 큰 차이를 보였다. 특히 제조사 측에서는 생산성능, 신뢰성, 편의성, 가격 및 원가 모두에 대해 매력적(A) 품질속성으로 평가한 반면, 사용자 측에서는 신뢰성에 대해서만 매력적 또는 당연적(M)으로 평가하고 나머지는 무관심(I)으로 평가하는 경우가 많았다. 이러한 결과는 이 분야 사용자와 생산자 간 품질속성에 대한 인식이 다르게 나타나고 있으며, 이에 대한 개선 및 전략적 활용의 필요성이 있음을 시사한다. 또한 상기의 결과는 CoPS는 규모의 경제와 비용절감보다는 제품 자체의 성능이 중요함을 시사한다. 따라서 증착장비 제조사들은 복합제품시스템의 특징을 반영한 혁신전략을 마련할 필요가 있다.