Earticle

본 논문에서는 전문가용 Bike를 위한 sizing 및 fitting 시스템을 구현한다. 수동으로 신체의 사이즈를 측정하여 그에 맞는 프레임을 선정하여 산악용 바이크를 제작함으로써 많은 시간이 걸린다. 이 비해 신체의 조건을 자동측정하고 자전거의 프레임과 여러 가지 부품을 세팅함으로써 시간절약은 물론 무리한 운동으로 오는 질병을 예방할 수 있다. 본 연구는 신체의 자동측정을 위하여 크로마키 기법을 이용한 피사체의 아바타 영상정보 추출을 통하여 사이징(sizing)과 피팅(fitting)을 실시하는 알고리즘을 제시한다. 이때 사용자는 정보를 손쉽게 취득할 수 있고, 필요에 따라 그 정보를 활용함으로써 사용자는 고객관리 뿐만 아니라 보다 신속하고 정확한 데이터 관리에 충실함으로써 시간절약은 물론 서비스를 원활히 할 수 있다.

In this paper, we have developed an intellectual sizing and fitting system for bike user. In order to prevent the disease, we should adjust the bike's frame and select several components in the body size. Then it propose an extractions algorithm of avatar imagination with the cromakey method and realize the sizing and fitting.

A decision support system for determining reservoir capacity, named as KORESIDSS (KOwaco's REservoir SIzing Decision Support System), was developed. The system is composed of three subsystems; a database/information subsystem, a model subsystem, and an output subsystem. This system is operated using MS-Windows with a GUI (Graphic User Interface) system developed using Visual Basic 5.0. As a continuous runoff model, the DAWAST model (DAily WAtershed STreamflow model) developed by Noh(1991) was and its analysis module was developed. This system was applied to a newly-planned dam, the Cheongyan Dam, Which will be located in Cheongyang-Gun, Chungcheongnam-Do and it was proved to be applicable in determining reservoir storage.

핀테크에 적용되는 소프트웨어의 규모 추정은 매우 난해하며, 오랜 시간이 소요되는 작업이기에 발주 기업 과 개발 업체들이 정확하게 소프트웨어 개발 규모를 산정하기 어려운 상황이다. 일반적으로 프로젝트 관리자들의 경험과, 일반적인 기능 점수 방식에 의하여 규모를 추정하고 있다. 본 논문에서는 기능 점수 모형을 사용자 관점에 서 요구 기능들을 정량적으로 산정하고, 규모를 측정하여, 실시간으로 규모를 산정하여 핀테크 개발 프로젝트에 적용할 수 있는 모델을 제안한다. 제안 모델을 통하여 개발 전에 업무량을 예상하여 규모를 측정할 수 있으며, 레이어 별 프로그램 목록을 기준으로 M/M 및 견적 금액을 산출할 수 있다. 향후 연구에서는 기존 핀테크 프로젝 트의 규모 산정 데이터를 다량 확보하여 정확한 규모 산정에 대한 연구가 필요하다.

Estimation on SW Sizing applied to fintech is very difficult, a task requiring long time, it is difficult for client companies and developer companies to accurately calculate the size of software development. The size is generally estimated based on the experience of project managers and the general functional scoring method. In this paper, propose a model that can be applied to fintech development projects by quantitatively calculating the required functions from the user's point of view, measuring the scale, and calculating the scale in real time. Through the proposed model, the amount of work can be estimated prior to development and the size can be measured, and the M/M and the estimated quotation amount can be calculated based on the program list by each layer. In future studies, by securing size computation data on existing the Fintech Project in mass, research on accurate size computation would be required.

This paper deals with the problem of determining the retailer's optimal price and order size under the condition of order-size-dependent delay in payments. It is assumed that the length of delay is a function of the retailer's total amount of purchase. The constant price elasticity demand function is adopted which is a decreasing function of retail price. Investigation of the properties of an optimal solution allows us to develop an algorithm whose validity is illustrated through an example problem.

In manufacturing process of semiconductor package, the thermal stress owing to high temperature in moulding and the bubbles generated in chip bonding process become main causes to produce void. On this study we evaluated quantitatively void size by use of ultrasonic spectroscopy method which analyze the reflective pulses with broad band frequency in frequency domain, and after destructive testing we verified effectiv- eness of sizing void by use of ultasonic spectroscopy.

A large amount of time and cost is consumed due to congestions caused by an increasing number of cars which results in a lot of emissions. To overcome these problems, a new electric vertical takeoff and landing (eVTOL) aircraft is being considered. Since vertical take off and landing without a separate runway is realized and electricity is used as a power source, it could solve the saturated ground traffic congestions without emissions. In this paper, the initial sizing was performed based on the Nexus 6HX of Belltextron which is a tilt-ducted fan type. In this study, the electric propulsion system that only uses battery was implemented instead of current Nexus 6HX hybrid electric propulsion. Aerodynamic analyses were performed using OpenVSP and XFLR5. Power-to-weight ratio, wing loading, estimated weight were calculated with these analyses.

많은 나라들에서 늘어가는 자동차로 인한 교통체증에 대체 할 수 있는 새로운 교통수단에 대한요구가 증가하고 있다. 또한, 경제적인 성장으로 인한 자동차 보유 대수의 증가로 앞으로 교통체증은 더욱 증가할 것이다. 이를 위해 도로주행형 개인용 항공기(PAV; personal air vehicle)에 관한 많은 연구가 진행되고 있다. 본 연구에서는 도로주행형 PAV의 사이징에서 엔진과 익형의 종류에 따른 주요 설계 변수인 익면하중과 동력대중량비를 구하기 위한 사이징을 수행하였다. 즉, 사이징 과정에서 국내 환경과 일반 항공기급 인증기준인 FAR PART 23을 고려한 임무형상에 대하여 익면하중, 동력대중량비, 제동마력, 그리고 연료효율의 그래프를 통해서 설계점을 결정하는 연구도 수행하였다. 사이징 결과 디젤 엔진을 사용하는 경우 가솔린 엔진보다 더 큰 중량으로 인해 더 큰 이륙총중량, 날개 면적, 그리고 더 큰 동력을 요구한다.

In many countries, there are needs of new transportations to replace ground congestions due to growing number of cars. In addition, the increase in the number of cars held by economic growth will further increase traffic congestion in the future. To overcome this problem, many researches have been performed for personal air vehicle (PAV). In this study, the wing loading and the power-to-weight ratio that are major design parameters for the sizing of roadable PAVs were calculated for different kinds of airfoil and engine types. I.e., in the sizing process, the study was conducted to determine the design point using the graphs of wing loading, power-to-weight ratio, brake horse power, and fuel efficiency for the given mission profiles considering domestic environments and the FAR PART 23 which is the GA class aircraft certification standard. As a result of sizing, using diesel engine require high maximum take-off weight, wing area, and power compared to gasoline engine due to more engine weight.

Recently, Genetic Algorithm(GA), which is a stochastic direct search strategy that mimics the process of genetic evolution, is widely adapted into a search procedure for structural optimization. Contrast to traditional optimal design techniques which use design sensitivity analysis results, GA is very simple in their algorithms and there is no need of continuity of functions(or functionals) any more in GA. So, they can be easily applicable to wide area of design optimization problems. Also, owing to multi-point search procedure, they have higher porbability of convergence to global optimum compared to traditional techniques which take one-point search method. The methods consist of three genetics opera- tions named selection, crossover and mutation. In this study, a method of finding the omtimum size and topology of drilling machine is proposed by using the GA, For rapid converge to optimum, elitist survival model,roulette wheel selection with limited candidates, and multi-point shuffle cross-over method are adapted. And pseudo object function, which is the combined form of object function and penalty function, is used to include constraints into fitness function. GA shows good results of weight reducing effect and convergency in optimal design of drilling machine.

현재 우리나라를 포함한 다수의 국가에서 지상 교통수송 체계가 포화상태에 이르렀다. 이를 해결하기 위해 교통체계의 3차원 화로 교통체증을 완화하고 door-to-door 이동성을 달성하고자 도로주행형 개인용 항공기 (PAV; personal air vehicle)에 관한 많은 연구가 진행되고 있다. 본 연구에서는 도로주행형 PAV의 사이징에서 지상 활주거리, 상승률, 최대 순항속도, 최대 상승고도, 실속 속도 등의 구속조건하에서 주요 설계 변수인 추력대중량비, 익면하중, 동력대중량비를 구하기 위한 구속조건 해석을 수행하였다. 또한 사이징 과정에서 국내 환경과 일반항공기급 인증기준인 FAR PART 23을 고려한 임무형상에 대하여 추력대중량비, 익면하중, 동력대중량비, 그리고 제동마력의 그래프를 통해서 설계점을 결정하는 연구도 수행하였다.

At present, the ground transportation system is saturated in many countries including Korea. To overcome this problem, many researches of developing a roadable personal air vehicle (PAV) are being carried out to alleviate traffic congestion and to accomplish door-to-door mobility through three-dimensional traffic system. In this study, the thrust-to-weight ratio, the wing loading, and the power-to-weight ratio that are major design parameters for the sizing of roadable PAVs were calculated under the constraints of ground roll, climb rate, maximum cruise speed, service ceiling, stall speed. Also, in the sizing process, the study was conducted to determine the design point using the graphs of thrust-to-weight ratio, wing loading, power-to-weight ratio, and brake horse power for the mission profiles considering domestic environments and the FAR PART 23 which is the GA class aircraft certification standard.

A genetic algorithm (GA) is a stochastic direct search strategy that mimics the process of genetic evolution. The GA applied herein works on a population of structural designs at any one time, and uses a structured information exchange based on the principles of natural selection and wurvival of the fittest to recombine the most desirable features of the designs over a sequence of generations until the process converges to a "maximum fitness" design. Principles of genetics are adapted into a search procedure for structural optimization. The methods consist of three genetics operations mainly named selection, cross- over and mutation. In this study, a method of finding the optimum topology of truss/beam structure is pro- posed by using the GA. In order to use GA in the optimum topology problem, chromosomes to FEM elements are assigned, and a penalty function is used to include constraints into fitness function. The results show that the GA has the potential to be an effective tool for the optimal design of structures accounting for sizing, geometrical and topological variables.variables.

A simulation model for reservoir sizing was developed to be applied in a region with insufficient hydrological data. Reservoir storage balance equation was formulated on a monthly basis. Gajiyama equation was generalized to estimate monthly reservoir inflow more accurately. Monthly evaporation equation on a reservoir water surface was introduced , which was functioned with monthly mean temperature. Generalized Gajiyama equation was applied to estmate reservoir inflow of the Sayeon dam. Nash-Sutcliffe's model efficiency was 0.793. Using developed model for reservoir sizing, water supply capacity was analyzed with 118.000㎥/day on the Sayeon dam. This showed a reasonable result as compared with 110000㎥/day in other technical report. For general application of developed model, a virtual reservoir was considered and its dta of surface area and volume by elevation was prepared using DEM. Using the model, size of reservoir was determined and water supply capacity was anlayzed on a virtual reservoir.

This research was carried out to investigated the effect of base paper and latex binder on printability and obtical properties of coated paper. Especially, it examined the effect of th pH of vase paper surface and functional groups of latices on the interactions between coating color components and on the structure of coated layer. It was found that the behavior of coating color containing amphoeric latex depends on the pH in the boundary region between coating color and base paper. Thus, the coating color formulated with amphoteric latex formed bulky coating layer by inducing stronger interaction between paper surface and coating components than the coating color with anionic latex. The coated paper with amphoteric latex showed better optical properties (i.e.gloss and optical) and printability (i.e. ink receptivity, wet ink receptivity, and ink set off) than the conventional anionic latex in the acidic and alkaline paper. However, dry pick strength of the coated paper was less decreased. This result indicated that amphoteric latex could also be applied practically to the alkaline paper.

‘정보시스템 하드웨어 규모산정 지침’은 정보화사업 시 도입하고자 하는 하드웨어의 적절한 규 모를 산정할 수 있도록 다양한 방법을 제시하고 있으며, 장비의 성능 수치를 객관화하기 위해 공신력 높은 국제 표준을 적용하고 있다. 신규 시스템 구축 시 많이 활용되는 수식계산법은 상대적으로 근거 를 명확하게 제시할 수 있으나, 다른 방법론에 비해 산술적으로 도출된 값이 명확한지에 대한 확인이 어렵다는 단점이 있다. 이에, 도입되는 서버에 대한 실측을 통해 사전-사후를 동시에 검증할 필요가 있 다. 본 연구에서는, 특정 업무에 대한 규모산정과 실측을 동시에 수행하여 상호간에 어느 정도의 오차 범위가 발생하는지를 확인하였다. 본 연구에서는 WEB/WAS 서버의 도입을 가정하여 규모를 산정함 과 동시에, 해당 업무에 활용될 수 있는 x86 서버에 대해 지침에서 지정하고 있는 SPECjbb2015 국 제 공인 도구를 활용하여 실측을 수행하였다. 그 결과, 규모산정 값은 평균 56,520 Max-jOPS로 산 정되었으며, 실측값은 평균 52,537 Max-jOPS의 성능이 측정되어 두 값의 오차가 7.6% 이내임을 확 인하였다. 이는 규모산정의 계산식 및 보정치가 적절하게 산정되어 있음을 확인해주는 결과이기도 하다.

This research is focusing on comparison between HW sizing calculation by ‘A Guideline for Hardware Sizing of Information System’ and actual performance measurement by SPECjbb standard. To calculate HW sizing, we assume that public organization will construct web server. With a guideline, 56,520 Max-jOPS have calculated. Through SPECjbb2015 standard, 52,537 MaxjOPS have measured at objected server. As a result, only 3.3% of error range have estimated when we compare those of Max-jOPS values.

In this days, information resources are very important in the organization. So, Many public institutions as well as private companies eager to IRM(information resource management). Especially, one of core elements in this IRM is sizing for information system. But, many cases of sizing is executed independently, even though hardware and software are very strongly connected, Many people say that it is not efficiency. In this paper, we have established the integrated sizing model for information system. The proposed model based on hardware sizing guidelines, announced by National Information Society Agency, and software price guidelines, announced by Korean software promotion agency.

Most research on lot sizing has been for the case of a manufacturing system. In this paper, analogous issues are studied for a distribution network. Specifically, we consider the choice of shipment quantities within distribution requirements planning(DRP). A simulation model of DRP in a multi-echelon, rolling-schedule environment is used to examine, in the condition of a certain demand, the performance of five lot-sizing rules. We conducted a full-factorial experiment in which additional parameters were varied : distribution network structure, demand distribution, a level of inventroy and service, as suggested by the consulting study which motivated our research. We found that for DRP, contrary to the "shop floor" wisdom on MRP, the choice of lot-sizing method can be important. In the comparative evaluation between the lot-sizing methods with different demand patterns, the LFL and FPR techniques are more favorable for low inventory level and high service level as the demand is more intermittent and nonniform, and the EOQ and LTC are more unfavorable in the distribution network.

하드웨어 규모산정은 정보시스템의 도입과정에서 예상 수요를 바탕으로 적절한 규모의 성능을 추정하는 것을 의미한다. 기존 조사에 따르면 공공부문의 정보시스템 도입에서 하드웨어는 총 비용의 50%에서 90%를 차지한다고 한다. 따라서 예산의 적절한 집행을 위해 적정 규모의 하드웨어 성능을 예측하는 것은 중요하다고 할 수 있다. 이에 우리나라는 정보보호 하드웨어 규모산정 지침을 활용하 여 하드웨어 규모산정을 실시하고 있다. 코로나 이후 교육환경은 오프라인 중심에서 온라인-오프라인 혼합형으로 진화하고 있다. 그리고 이를 위해 교육의 정보화 또한 활발하게 진행되고 있다. 교육 시스 템은 기존 시스템과는 달리 사용자가 많고, 사용자가 특정 시점에 집중되며, 또 집중된 사용자 다수가 오퍼레이션을 유발한다는 특징이 있다. 따라서 기존과는 다른 관점의 하드웨어 규모산정이 필요하다. 이에 본 논문에서는 교육 시스템의 적정한 하드웨어 규모산정을 위해 기존 지침의 개선방안을 제시한 다. 본 논문의 결과는 향후 교육 시스템의 하드웨어 규모산정에 활용할 수 있을 것이다.

Hardware sizing means estimating the performance of an appropriate scale based on the expected demand during the information system introduction process. According to previous research, hardware accounts for 50% to 90% of the total cost in the introduction of information systems in the public sector. Therefore, it can be said that it is important to estimate the hardware performance of an appropriate scale for the proper execution of the budget. Accordingly, Korea is carrying out hardware sizing using the information security hardware sizing guidelines. After Corona, the educational environment is evolving from offline-centered to online-offline hybrid type. And for this purpose, the informatization of education is also actively progressing. Unlike the existing system, the education system has many users, the users are concentrated at a specific point in time, and a large number of concentrated users trigger the operation. Therefore, it is necessary to calculate the hardware scale from a different point of view than before. Therefore, in this paper, we propose an improvement plan for the existing guidelines for estimating the appropriate hardware size of the education system. The results of this paper can be used for estimating the hardware scale of the education system in the future.