• 한국정밀공학회지
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• 제15권2호
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• pp.154-161
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• 1998

Prototypes of a design are always needed for the purpose of visualization and evaluation in the aspect of manufacturability functionality, and aesthetic appearance. Since the prototyping process requires a significant amount of cost and time, various rapid prototyping processes are recently being introduced in the process. However, it is usually necessary for a part built up by a rapid prototyping system to be refined by a post-processing process, in which the stair steps on the surfaces, the support structures (if they exist), and the unprocessed material are eliminated. This post-processing is usually done manually and is a time-consuming task. Especially, eliminating the trapped volumes, the volume of the unprocessed material entrapped by the solidified portion, is sometimes impossible in some processes. This study provides a designer with a tool to detect the existence and to calculate the quantity of the trapped volumes at the given build-up direction, so that the proper build-up direction is chosen or the part is built by pieces to avoid the problems caused by the trapped volumes in advance. Since the proposed algorithm can efficiently calculate the amount of the trapped volumes at any build-up direction, it has the potential of such application as optimizing the build-up direction to minimize the trapped volumes.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집A
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• pp.860-865
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• 2000

This Paper Proposes the test pieces of X, Y and Z axes to compensate the shape distortion of Selective Laser Sintering(SLS) parts resulting from the phase change during the sintering process. In no case of the proposed compensation test pieces of X, Y axes the accurate rates of shrinkage can be measured with the reduction of curling which is obtained from adjustment of build orientation and the formula used to get scale factors are proposed with the shrinkage rates of them. The scale factors of X, Y and Z axes are generated by building up proposed compensation test pieces. The generated scale iactors are required to satisfy the dimensional accuracy even if there are changes of the build position and the size of SLS parts in the build chamber. For this reason, it is proposed that the build positions and the size be considered to be noise factors against the compensation test pieces and a method is also proposed that scale factors be selected to robustly maintain the dimensional accuracy of SLS parts under the actual operating conditions with the application of the Taguchi Method.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.78-83
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• 2007

The paper focuses on the establishment of optimized bucket path planning and trajectory control designated for force-reflecting backhoe reacting to excavation environment, such as potential obstacles and ground characteristics. The developed path planning method can be used for precise bucket control, and more importantly for obstacle avoidance which is directly related to safety issues. The platform of this research was based on conventional papers regarding the kinematic model of excavator. Jacobian matrix was constructed to find optimal joint angles and rotation angles of bucket from position and orientation data of excavator. By applying Newton-Raphson method optimal joint angles and bucket orientation were derived simultaneously in the way of minimizing positional errors of excavator. The model presented in this paper was intended to function as a cornerstone to build complete and advanced path planning of excavator by implementing soil mechanics and further study of excavator dynamics together.

• 한국CDE학회논문집
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• 제7권2호
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• pp.96-101
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• 2002

Rapid Prototyping (RP) technology has been advanced to fabricate initial prototypes from various materials. Stratasys′ Fused Deposition Modeling (FDM) is one of the typical RP processes that provide functional prototypes of ABS plastic. In order to predict the behavior of final ABS parts, it is critical to understand the material properties of the raw FDM process material, and the effect that FDM build parameters have on the FDM part. In this paper, we seek to characterize the properties of ABS parts fabricated by the FDM 1650. Using the Design of Experiment (DOE) approach, the process parameters of FDM, such as raster orientation, air gap, bead width, color, and model temperature were examined. Tensile strengths of crisscross specimens, 〔45°/-45°〕, cross specimens, 〔0°/90°〕, and directionally fabricated tensile specimens (〔0°〕 and 〔90°〕) were measured and compared with the injection molded FDM-ABS P400 material. For the FDM parts made with a -0.003"air gap, the typical tensile strength ranged between 50 percent and 83 percent of the strength of injection molded ABS P400. From the experiments, a couple of build rules for designing FDM parts were obtained.

• 한국조리학회지
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• 제18권1호
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• pp.168-181
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• 2012

이 연구는 음식축제를 방문한 축제관람객의 축제관광행위지향성과 축제만족도, 사후행위의도의 관계를 분석하고자 하였다. 설문조사는 2011 대한민국 국제요리 경연대회 방문객을 대상으로 실시되었으며, 213부의 유효표본을 획득하였다. 연구결과, 이 연구에서 제시하였던 네 가지의 축제관광행위지향성 요인 중 '자기확장', '사회유희', '체험자체' 축제관광행위지향성이 통계적 유의수준인 0.05하에서 축제만족과 사후행위의도에 직 간접적으로 유의한 영향을 미치는 것으로 검증되었다. 변수들간의 상대적 영향력은 '자기확장' 축제관광행위지향성이 축제만족과 사후행위의도에 가장 큰 영향을 미치는 변수로 나타났다. 그러나 '구별짓기' 축제관광행위지향성은 통계적 유의수준하에서 축제만족과 사후행위의도에 유의미한 영향을 미치지 못하는 것으로 나타났다. 이러한 분석결과는 국제요리 경연대회의 관람객 만족도 증가와 마케터들의 경쟁력 있는 축제관광상품 개발에 유의미한 정보를 제공할 수 있을 것으로 보인다.

• 한국콘텐츠학회논문지
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• 제14권3호
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• pp.401-413
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• 2014

본 연구에서는 항공사 객실승무원을 대상으로 감성지능이 고객지향성에 미치는 영향을 파악해 보고자 하였다. 또한 승무원의 감성지능과 고객지향성의 관계에 있어 사회적 지원의 조절효과를 살펴봄으로써 감성지능 연구의 이론적 실무적 시사점을 제공하고자 하였다. 현재 운항중인 두 대형항공사의 객실승무원을 대상으로 자료를 수집하였으며 분석결과는 아래와 같다. 편의표본추출을 통해 233부의 설문지를 항공사 승무원을 대상으로 회수하였으며, 결측치가 있는 자료를 제외하고 214부를 활용하였다. SPSS 18.0을 통해 자료 분석을 실시하였으며 분석결과는 아래와 같다. 첫째, 감성지능은 이론적 고찰을 통해 자기감정인식, 타인감정인식, 감정조절, 감정활용의 하위요인으로 구분하였으며 그 중 자기감정인식을 제외한 모든 요인이 고객지향성에 유의한 정(+)의 영향을 미치는 것으로 나타났다. 둘째, 감성지능과 고객지향성의 관계에 있어 동료지원은 조절효과가 있는 것으로 나타났다. 셋째, 상사지원과 조직지원은 감성지능과 고객지향성의 관계에 있어 부분적으로 조절효과가 있는 것으로 나타났다. 이러한 연구 자료를 활용하여 팀워크를 강화할 수 있는 교육프로그램을 마련하고, 동료들 간의 관계를 돈독히 할 수 있는 프로그램을 제도적으로 마련하여 지원해주는 것이 필요하다.

• 한국프랜차이즈경영연구
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• 제9권2호
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• pp.17-29
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• 2018

Purpose - The environment surrounding the franchise industry in recent years is a big threat to the franchise business. In this perspective, this study examines the effect of franchise CEO's Innovation, CSR Passion, and customer orientation(CO) on customers' perceived service quality(PSQ), affection, and commitments in the context of food-service franchise industry. This study suggests the guidelines on how franchisor uses their passion and customer orientation on customer to maintain and increase the commitments. Research design, data, and methodology - In order to achieve these purposes, research model and hypotheses were developed. Out of 500 respondents received through online survey, 449 respondents were used, because of 51 incomplete respondents. The data were analyzed using frequency analysis, confirmatory factor analysis, correlation analysis, and structural equational modeling with SPSS 23.0 and AMOS 23.0 statistical program. Result - The results of the study are as follows. First, innovation passion has a significant impact on PSQ and customer affection. And CSR passion have a significant impact on PSQ. Second, customer orientation has a significant impact on PSQ and customer affection. Third, PSQ has a significant impact on customer affection and sustainable commitment. Fourth, customer affection has a significant impact on behavioral commitment. Fifth, behavioral commitment has a significant impacts on sustainable commitment. Conclusions - The implications of this study are following as: Restaurants franchisor and CEOs should have a passion for innovation to continuously identify consumer needs and develop new menus and services that meet their needs. Second, franchisor and CEOs need to demonstrate the importance of creating the right environment, creating a fair business, and trying to create products in a given environment. Finally, franchisor and CEOs should demonstrate how to build relationships with customers and how to maintain positive feelings. In addition, it is necessary to appeal to the customers with enthusiasm and a customer-oriented tendency of the entrepreneur of the franchise head office in order to maintain the relationship with the customer and feelings.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2002년도 춘계학술대회 논문집
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• pp.561-564
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• 2002

With Rapid Prototyping system, the efficient packing in a fixed work volume reduces build time when multiple parts are built in a process. In this paper, an efficient and rapid packing algorithm is developed for SLS system that has cylindrical workspace. A genetic algorithm is implemented to place as many part as possible in a vat. For fast computation, a collision detection algorithm "k-DOPs Tree" is implemented.

• Journal of Korean Dental Science
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• 제12권1호
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• pp.13-19
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• 2019

Purpose: The aim of this study was to compare the flexural strength of provisional fixed dental prostheses which was three-dimensional (3D) printed by several build directions. Materials and Methods: A metal jig with two abutment teeth and pontic space in the middle was fabricated. This jig was scanned with a desktop scanner and provisional restoration was designed on dental computer-aided design program. On the preprocessing software, the build angles of the restorations were arranged at $0^{\circ}$, $30^{\circ}$, $45^{\circ}$, $60^{\circ}$, and $90^{\circ}$ and support was added and resultant structure was sliced to a thickness of $100{\mu}m$. Processed restorations were printed with digital light processing type 3D printer using poly methyl meta acrylate-based resin. After washing and post-curing, compressive loading was applied at a speed of 1 mm/min on a metal jig fixed to a universal testing machine. The maximum pressure at which fracture occurred was measured. For the statistical analysis, build direction was set as the independent variable and fracture strength as the dependent variable. One-way analysis of variance and Tukey's post hoc analysis was conducted to compare fracture strength among groups (${\alpha}=0.05$). Result: The mean flexural strength of provisional restoration 3D printed with the build direction of $0^{\circ}$ was $1,053{\pm}168N$; it was $1,183{\pm}188N$ at $30^{\circ}$, $1,178{\pm}81N$ at $45^{\circ}$, $1,166{\pm}133N$ at $60^{\circ}$, and $949{\pm}170N$ at $90^{\circ}$. The group with a build direction of $90^{\circ}$ showed significantly lower flexural strength than other groups (P<0.05). The flexural strength was significantly higher when the build direction was $30^{\circ}$ than when it was $90^{\circ}$ (P<0.01). Conclusion: Among the build directions $0^{\circ}$, $30^{\circ}$, $45^{\circ}$, $60^{\circ}$, and $90^{\circ}$ set for 3D printing of fixed dental prosthesis, an orientation of $30^{\circ}$ is recommended as an effective build direction for 3D printing.

• 과학교육연구지
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• 제38권1호
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• pp.103-119
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• 2014

이 연구의 목적은 중학교 일정성분비의 법칙 수업에서 드러난 과학교사의 교수지향과 이의 형성에 영향을 준 요인을 알아보는 것이었다. 이를 위해 이 연구에 참여한 과학 교사 8명의 수업을 녹화 및 분석하고 면담, CoRe 질문지 등을 통하여 자료를 수집하였다. 수업 과정에서 드러난 교사의 활동으로부터 그의 과학교수 지향을 알아내고, 수집한 자료의 분석을 통하여 각 교사의 교수지향 형성에 영향을 준 요인을 추출하였다. 연구 결과, 과학교사들의 교수지향은 크게 활동 지향과 강의 지향으로 구분되었으며, 활동 지향은 다시 탐구적 혹은 비탐구적, 강의 지향은 상호작용 중심 혹은 내용전달 중심으로 범주화 되었다. 과학교사들의 교수지향 형성에 영향을 준 요인은 수업경험을 통한 반성적 사고, 동료교사와의 상호작용, 교육환경에 대한 고려, 학습자로서의 수업 및 연수내용, 교사 자신의 흥미와 호기심이었는데, 그 중에서 수업 경험을 통한 반성적 사고가 가장 큰 영향을 주었고, 교사 자신의 흥미와 호기심은 제한적이지만 긍정적인 과학교수 지향 형성에 강력한 영향을 주었다. 반면에 교육환경에 대한 고려는 다른 요인들과는 달리 교사들의 과학교수 지향 형성에 부정적인 영향을 미치는 것으로 나타났다. 동료교사와의 상호작용, 대학이나 대학원에서의 수업 내용 및 현직 교사를 위한 연수 내용은 과학교수 지향 형성에 일정 부분 영향을 주었으나, 주로 교과내용 지식의 형성에 영향을 주는 수준으로 나타났다.