• Journal of Radiation Protection and Research
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• 제47권1호
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• pp.16-21
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• 2022

Background: Epidemiological observations such as mental retardation, physical deformities, etc., in children besides different types of cancer in the adult population of the Malwa region have been reported. The present study is designed to get insight into the role of naturally occurring radioactive material (NORM) in causing detrimental health effects observed in the general population of this region. Materials and Methods: Deep soil samples were collected from different locations in the Malwa region. Their activity concentrations were determined using low-level background gammaray spectrometry. High efficiency and high purity germanium detector capped in a lead-shielded chamber having a resolution of 1.8 keV at 1,173 keV and 2.0 keV at the 1,332 keV line of ⁶⁰Co was used in the present work. Data were evaluated with Genie-2000 software. Results and Discussion: Mean activity concentrations of ²³⁸U, ²³²Th, and ⁴⁰K in deep soil were found to be 101.3 Bq/kg, 65.8 Bq/kg, and 688.6 Bq/kg, respectively. The mean activity concentration of ²³⁸U was found to be three and half times higher than the global average prescribed by the United Nations Scientific Committee on the Effects of Atomic Radiation (UNSCEAR). It was further observed that the activity concentration of ²³²Th and ⁴⁰K has a magnitude that is nearly one and half times higher than the global average prescribed by UNSCEAR. In addition, the radioisotope ¹³⁷Cs which is likely to have its origin in radiation fallout was also observed. It is postulated that the NORM present in high quantity in deep soil somehow get mobilized into the water aquifers used by the general population and thereby causing harmful health problems. Conclusion: It can be stated that the present work has been able to demonstrate the use of low background gamma-ray spectrometry to understand the role of NORM in causing health-related effects in a general population of the Malwa region of Punjab, India.

• 해양환경안전학회지
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• 제23권3호
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• pp.258-265
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• 2017

This paper validates a system identification method using mathematical optimization using sea trial measurement data as a benchmark. A fast time simulation tool, SIMOPT, and a Rheinmetall Defence mathematical model have been adopted to conduct initial hydrodynamic coefficient estimation and simulate ship modelling. Calibration for the environmental effect of sea trial measurement and sensitivity analysis have been carried out to enable a simple and efficient optimization process. The optimization process consists of three steps, and each step controls different coefficients according to the corresponding manoeuvre. Optimization result of Step 1, an optimization for coefficient on x-axis, was similar compared to values applying an empirical regression formulae by Clarke and Norrbin, which is used for SIMOPT. Results of Steps 2 and 3, which are for linear coefficients and nonlinear coefficients, respectively, was differ from the calculation results of the method by Clarke and Norrbin. A comparison for ship trajectory of simulation results from the benchmark and optimization results indicated that the suggested stepwise optimization method enables a coefficient tuning in a mathematical way.

• International Journal of Naval Architecture and Ocean Engineering
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• 제3권4호
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• pp.254-262
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• 2011

This study aims to optimize an arrangement of ship compartments with knowledge-based systems. Though great attention has been shown to the optimization of hull forms in recent years, the study on arrangement design optimization has received relatively little attention. A ship is both an engineering system and a kind of assembly of many spaces. This means that, to design an arrangement of ship compartments, it is necessary to treat not only geometric data but also knowledge on topological relations between spaces and components of a ship. In this regard, we select a suitable knowledge representation scheme for describing ship compartments and their relations, and then develop a knowledge-based system using expert system shell. This new approach is applied to create design variations for optimization on an arrangement of a pressure hull of a submerged vehicle. Finally, we explicate how our approach improves the design process.

• Journal of Advanced Marine Engineering and Technology
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• 제40권10호
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• pp.935-941
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• 2016

Predicting and evaluating ship manoeuvring characteristics are very important not only for the design stage, but also for the existing vessels. There are several ways to predict ship's manoeuvrability and most of them are highly connected with the estimation of hydrodynamic coefficients. This paper presents a new estimation method using the system identification with mathematical algorithms for estimating hydrodynamic coefficient in the ship's mathematical model. Specifically a double ended ferry which equips four azimuth propulsion systems were chosen as benchmark ship and a set of benchmark data which is generated in the fast time simulation software was provided to conduct mathematical optimization process. Also the initial values for the optimization were borrowed from the empirical regression formulas of the simulation software of Rheinmetall Defence ship simulator. Therefore the newly suggested mathematical optimization algorithm gave a successful result for estimation hydrodynamic coefficients. Proper optimization conditions of the objective function and constraints were also verified during the study.

• 한국전산구조공학회논문집
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• 제34권5호
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• pp.287-292
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• 2021

본 논문에서는 CAD 시스템에서 사용하는 NURBS 기저함수를 사용하는 아이소-지오메트릭 해석(Isogeometric analysis) 방법과 기하학적으로 엄밀한 빔 모델링(geometrically exact beam model)을 활용하여 회전과 병진 운동이 결합된 새로운 형태의 메타물질(metamaterial)에 대한 해석을 진행하였다. 이차원 셀 구조는 자유형상변환(Free-form deformation) 법과 적절한 내삽법(Interpolation)을 통해 원통 위에 입혀졌다. 원통의 치수와 셀 개수가 비틀림 각도에 미치는 영향이 매개변수 연구(parametric study)를 통해 확인되었다. 비틀림과 병진 운동이 결합된 구조의 메커니즘에 대해 수치 예제를 통해 알아보았다.

• 해양환경안전학회지
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• 제23권7호
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• pp.933-940
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• 2017

선박의 다양한 흘수 및 트림 조건은 조종성능 추정을 위한 중요한 요소 중 하나이다. 본 논문에서는 세 종류의 흘수 및 트림 조건에서의 해상 시운전 자료를 바탕으로 하여 선체 유체력 미계수를 추정하였다. 시스템 식별법(system identification)의 하나인 수학적 최적화(mathematical optimization method) 및 Rheinmetall Defense사의 선박 운동 모델을 적용한 fast time 시뮬레이션 소프트웨어를 이용하여 시운전 항적데이터 및 관련 시뮬레이션 자료를 이용하여 선체 유체력 미계수를 추정하였다. 최적화 된 계수를 적용한 시뮬레이션 결과는 기존 계수 추정식을 사용한 시뮬레이션 결과와 대비하여 해상 시운전 계측 결과와 유사함을 보여주었으며 추가로 진행된 2차 검증 결과에서도 상대적으로 높은 유사함을 확인하였다.

• 공연문화연구
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• 제36호
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• pp.415-440
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• 2018

2015년 9월 23일 교육부는 초 중등교육법 제23조 제2항에 의거하여 '창의융합형 인재 양성'을 지향하는 2015 개정 교육과정을 고시하였다. 이에 따라 음악과 교육과정 또한 일부 개정되었는데, 그 큰 틀은 2009 개정 음악과 교육과정을 유지하고 있는 것으로 보인다. 음악과의 영역 안에서 정간보는 초등학교 3~4학년의 교육과정에서 이미 노출되고 있기는 하지만, 정간보의 명칭 유래 및 창안 배경을 비롯한 악보 읽는 방법, 음높이 및 음길이 나타내는 방법 등에 관한 학습 내용은 5~6학년에서 구체적으로 다루어지도록 되어 있다. 정간보는 15세기 중엽 조선조 세종에 의해 창안된 동양에서 가장 오래된 유량악보로 알려져 있으며, 현전하는 악보 중 가장 오래된 악보인 "세종실록악보"에서 처음으로 사용되었다. 그런데 대부분의 국악 관련 전문서적은 물론이거니와 음악교과서에서는 분명한 근거를 제시하지 않은 채 세종이 정간보를 창안한 주체임을 무비판적으로 수용하고 있다. 그렇다면 과연 어떤 근거에 입각하여 세종이 정간보를 창안하였다고 주장하는지 가려낼 필요가 있겠다. 본고에서는 먼저 초등학교 5~6학년 음악교과서에서 소개되는 '세종이 정간보를 창안하였다'는 명제에 대한 근거를 세종의 신악 창제, 세조의 정간보 창작, 세종의 한글 창제로 구분하여 살펴보았다. 다음으로 2009 개정 음악과 교육과정을 바탕으로 발행된 초등학교 5~6학년 6종 검정교과서를 대상으로 정간보 창안의 주체가 어떻게 기술되어 있는지 살펴보고, 그에 따른 문제점을 지적함으로써 바람직한 음악교육의 방향성을 제시하고자 하였다. 세종의 신악 창제, 세조에 의한 1행 16정간의 정간보 제작, 세종의 한글 창제 등 역사적 기록 및 정황들을 종합해 보면, 세종이 정간보의 창안 주체임이 현재로서는 가장 타당해 보인다. 그러나 이러한 가능성만으로 명확하지 않은 일을 마치 사실인 것처럼 받아들이며 교육하는 음악학계의 태도는 바람직해 보이지 않는다. 따라서 필자는 정간보 창안의 주체자에 대한 명확한 근거가 드러나기 전까지 "세종이 정간보를 만들었다" 또는 "창안하였다"는 내용으로 기술하기보다는 "정간보는 세종조에 창안되었다" 또는 "정간보는 세종에 의해 창안된 것으로 추정된다"로 바꾸어 기술할 것을 제안하는 바이다.

• 디자인학연구
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• 18호
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• pp.165-174
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• 1996

1950년 독일의 브라운 사는 시장에서의 우위를 확보하고자 제품들에서 확고한 현대적 디자인의 실현을 근간으로 한 경영전략을 추구하기 시작하였다. 디자인 실장인 프릿츠 아이홀러(Fritz Eichler)박사는 울름 조형대학(Hochschule fur Gestaltung Ulm)이 한스 구겔로(Hans Gugelot)그리고 오틀아이혀(O시 Aicher)와 함께 코퍼레이트 아이덴터티 프로그램(Corporate Identity Programme)의 기초로서, 브라운 디자인 경영전략의 초기 기본 지침을 개발하였다. 그리고 1955년 이들에 가담하게 된 디터람스(Dieter Rams)는 브라운 디자인 전체의 형태를 특징 짓는 인물로서, 그 디자인의 계속적인 개발을 이끌어 왔다. 1950년 중반에 브라운 사의 전 제품 프로그램은 새로이 디자인되어지기 시작했고, 이는 곧바로 시장에서의 명백한 성공으로 이어졌다. 그리고 당시 독보적인 하나의 아방가르드(Avant-garde)운동이었던 브라운사의 새로운 디자인 라인은 일종의 객관화 할 수 있는 “훌륭한 형태(Good Form)”에 대한 생각의 본보기가 되었다. 이로서 브라운 사의 제품 프로그램 전체가 새로운 라인에 따라 재 디자인되어진 60년대와 70년대에, 브라운 디자인은 전 세계 디자인 분야의 현장에 결정적인 영향을 끼쳐왔다. 목적에 대한 완벽한 충족, 정밀함, 안전성, 내구성, 제품의 질 그리고 점차 최근에 들어서는 환경에 조화를 이루는 것 등에 기초를 두는 브라운 디자인은 무엇보다도 근본에 있어서 기능적이고 구체적이다. 그래서 브라운 제품들의 모든 요소들은 유사하게 조화를 이루어 통일 감을 주고, 모든 불필요한 세부사항들을 제거하고 필수적인 요소들을 체계적인 정돈에 집중되어 있다.

• Journal of Computing Science and Engineering
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• 제6권1호
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• pp.40-50
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• 2012

Increase in the number of older people due to demographic changes poses great challenges to the social healthcare systems both in the Western and as well as in the Eastern countries. Support for older people by formal care givers leads to enormous temporal and personal efforts. Therefore, one of the most important goals is to increase the efficiency and effectiveness of today's care. This can be achieved by the use of assistive technologies. These technologies are able to increase the safety of patients or to reduce the time needed for tasks that do not relate to direct interaction between the care giver and the patient. Motivated by this goal, this contribution focuses on applications of acoustic technologies to support users and care givers in ambient assisted living (AAL) scenarios. Acoustic sensors are small, unobtrusive and can be added to already existing care or living environments easily. The information gathered by the acoustic sensors can be analyzed to calculate the position of the user by localization and the context by detection and classification of acoustic events in the captured acoustic signal. By doing this, possibly dangerous situations like falls, screams or an increased amount of coughs can be detected and appropriate actions can be initialized by an intelligent autonomous system for the acoustic monitoring of older persons. The proposed system is able to reduce the false alarm rate compared to other existing and commercially available approaches that basically rely only on the acoustic level. This is due to the fact that it explicitly distinguishes between the various acoustic events and provides information on the type of emergency that has taken place. Furthermore, the position of the acoustic event can be determined as contextual information by the system that uses only the acoustic signal. By this, the position of the user is known even if she or he does not wear a localization device such as a radio-frequency identification (RFID) tag.

• World Technopolis Review
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• 제8권2호
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• pp.74-81
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• 2019

Cities will soon host two third of the population worldwide, and already today 80% of the world energy is used in the 20 largest cities. Urban areas create 80% of the greenhouse gas emission, so we should take care that urban areas are smart and sustainable as implementations have especially here the greatest impact. Smart Cities (SC) or Smart Sustainable Cities (SSC) are the actual concepts that describe methodologies how cities can handle the high density of citizens, efficiency of energy use, better quality of life indicators, high attractiveness for foreign investments, high attractiveness for people from abroad and many other critical improvements in a shifting environment. But if we talk about Entrepreneurship Ecosystem and Innovation, we do not see a lot of literature covering this topic within those SC/SSC concepts. It seems that 'Smart' implies that all is embedded, or isn't it properly covered as brick stone of SC/SSC concepts, as they are handled in another 'responsibility silo', meaning that the policy implementation of a Science and Technology Park (STP) is handled in another governing body than SC/SSC developments. If this is true, we will obviously miss a lot of synergy effects and economies of scale effects. Effects that we could have in case we stop the siloed approaches of STPs by following a more holistic concept of a Smart Sustainable City, covering also a continuous flow of innovation into the city, without necessarily always depend on large corporate SSC solutions. We try to argue that every SSC should integrate SP/STP concepts or better their features and services into their methodology. The very limited interconnectivity between these concepts within the governance models limits opportunities and performance in both systems. Redesigning the architecture of the governance models and accepting that we have to design a system-of-systems would support the possible technology flow for smart city technologies, it could support testbed functionalities and the public-private partnership approach with embedded business models. The challenge is of course in complex governance and integration, as we often face siloed approaches. But real SSC are smart as they are connecting all those unconnected siloes of stakeholders and technologies that are not yet interoperable. We should not necessarily follow anymore old greenfield approaches neither in SSCs nor in SP and STP concepts from the '80s that don't fit anymore, being replaced by holistic sustainability concepts that we have to implement in any new or revised SSC concepts. There are new demands for each SP/STP being in or close to an SC/SCC as they have a continuous demand for feeding the technology base and the application layer and should also act as testbeds. In our understanding, a big part of STP inputs and outputs are still needed, but in a revised and extended format. We know that most of the SC/STP studies claim the impact is still far from understood and often debated, therefore we must transform the concepts where SC/STPs are not own 'cities', but where they act as technology source and testbed for industry and new SSC business models, being part of the SC/STP concept and governance from the beginning.