• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2001년도 춘계학술대회 논문집
• /
• pp.28-31
• /
• 2001

Recently, in order to satisfy the consumer's demand the life cycle and the lead-time of a product is to be shortened. It is thus important to reduce the time and cost in manufacturing trial products. Several techniques have been developed and successfully commercialized in the market RPM(Rapid Prototyping and Manufacturing). However, most commercial systems currently use resins or waxes as the raw materials. So, the limited mechanical strength for functional testing is regarded as an obstacle towards broader application of rapid prototyping techniques. To overcome this problems, high-speed machining technology is being investigated worldwide for rapid manufacturing and even for direct rapid tooling application. In this paper, some fundamental experiments and analyses are carried out to obtain the filling time, materials, method, and process parameters for HisRP process. HisRP is a combination process using high-speed machining technology with automatic filling. In filling process, Bi58-Sn alloy is chosen because of the properties of los-melting point, low coefficient of thermal expansion and enviromental friendship. Also the use of filling wire is of advantage in term of simple and flexible mechanism. Then the rapid manufacturing product, for example a skull, is machined for aluminum material by HisRP process with an automatic set-up device of 4-faces machining.

• 한국통신학회논문지
• /
• 제40권1호
• /
• pp.115-123
• /
• 2015

스마트폰과 LTE 서비스가 국내 이동통신시장의 주류적 단말과 서비스로 자리 잡으면서, 데이터 서비스의 가치와 중요도는 더욱 높아지고 있다. 이미 이동통신 사업자들은 데이터 서비스를 시장의 핵심 니즈로 인식하고, 전송속도, 데이터 제공량, 무제한 요금 등 다양한 데이터 서비스 품질요소로 소비자에게 소구하고 있다. 따라서 성숙기에 진입한 스마트폰 시장에서 과연 소비자가 어떠한 기준으로 데이터 서비스를 선택 하는가?는 매우 중요한 문제로 인식된다. 이러한 배경에서, 본 연구는 이동통신 이용자의 데이터 서비스 선택 결정요인과 세분화된 이용집단내에서의 서비스선택 속성의 상대적 중요도에 대해 다루고 있다. 본 연구는 데이터서비스 중심 시대의 다양화된 이용자특성의 이해를 확장하며, 관련 통신정책 및 사업전략의 방향 설정에 시사점을 제공한다.

• 한국기술혁신학회:학술대회논문집
• /
• 한국기술혁신학회 2001년도 추계학술대회
• /
• pp.37-57
• /
• 2001

Digital technology enhanced the improvement of technological aspects in the both broadcasting and telecommunications industries. The infrastructures of each industry converged to one, which impacts not only on technology but also on the broadcasting service. The current broadcasting service is characterized by one-way service, but it'll changed to be customized, or two-way service that reflects the interest of customers. This change requires a new standard to categorize and analyze the future broadcasting service converged and market structure, differing from the present standard based on the transmission channels. This study aims at forecasting the demand of interactive TV service as a representative broadcasting service in the near future, and analyzing the market structure of the broadcasting services. We assume that the present broadcasting and information and telecommunications services such as terrestrial, cable TV, satellite, digital TV services and high-speed broadband service have strong relationship with interactive TV service. First we use Bass diffusion method to predict the diffusion curve of the present five services. Then we analyze the relationship between the present services and interactive TV service by Delphi method. Finally we estimate the potential subscription number of interactive TV service based on the relationship among the services and diffusion parameters.

• 융합보안논문지
• /
• 제15권4호
• /
• pp.73-82
• /
• 2015

스마트폰의 대중화에 힘입어 모바일 결제 시장이 급속히 성장하고 있다. 전자금융거래시 공인인증서 의무사용이 폐지됨에 따라 패스워드만으로 결제 가능한 간편결제가 속속 시장에 진출하고 있으나 확산속도는 그다지 빠르지 않다. 왜냐하면 소비자들의 개인정보유출 및 보안에 대한 우려, 결제 습관의 변화 기피, 소비자 보호 미흡, 결제인프라의 부족, 각종 규제 등으로 인하여 간편결제가 활성화되지 못하고 있기 때문이다. 최근 글로벌 IT기업들이 모바일 결제시장에 경쟁적으로 진출하고 있으며 이는 핀테크 혁신에서 뒤처지면 향후 생존이 위태로울 수 있다는 위기감과 폭발적으로 성장하는 모바일 결제시장의 주도권을 차지하겠다는 심리가 작용하고 있는 것이다. 이런 상황 속에서 우리의 간편결제가 외국에 종속되지 않고 독자적인 성장을 하기 위해서는 철저한 준비와 많은 노력이 필요하다, 본 논문에서는 간편결제의 본격 시행을 앞두고 국내 모바일 간편결제의 문제점을 짚어보고 활성화 방안으로 유연하고 차별적 보안, 소비자 보호체계 구축, 법제도 정비, 서비스의 차별화 등을 제안하였다.

• 대한안전경영과학회지
• /
• 제4권1호
• /
• pp.105-114
• /
• 2002

Nowadays, most companies seek after the greatest profit by means of offering the goods which consumers want timely and efficiently and minimizing the cost of inventory and distribution channel which amounts to the great portion of total cost. And according as EC(Electronic Commerce) market has increased rapidly, SCM(Supply Chain Management) for EC become one of the most important facts for companies, therefore this paper suggest SCM scheme which EC, especially B to C, is added to the existing commerce system. This paper uses internet for information integration of distribution channel which is away from one another and applies TOC(Theory of Constraint)'s DBR(Drum-Buffer-Rope) Scheduling for synchronization through the whole supply chain. It is possible to synchronize the whole supply chain by means of making the speed of manufacturing and distribution to be controlled by consumer's order which is received in distribution center, and inventory and loss of sales opportunities are minimized by constant. Buffer Management. If inventories in distribution center is short, then it needs to search CCR(Capacity Constraint Resource) in supply chain and to control the speed of manufacturing and distribution according to the ability of CCR. This paper applies PT(Partial Transshipment) strategy for Delivery from distribution center to store or cyber consumer. the strategy this paper suggests chooses neighbour area from area which each distribution center takes charge, and then makes product ordered by cyber consumer which lives in the chosen area to be delivered according to inventory of distribution center.

• 한국정밀공학회:학술대회논문집
• /
• 한국정밀공학회 2005년도 춘계학술대회 논문집
• /
• pp.1079-1082
• /
• 2005

This paper deals with the algorithm development that inspects defects such as Lens Focus, Focus check, Black Defect, Dark Defect, Dim Defect, Color Defect, and Line Defect, Angle Defect, IrisAgc Defect caused by the process of 2M Class Compact Camera Module (CCM). Domestic market was majorly comprised of VGA(0.3 million pixel) market. But in the middle of year 2004, camera phone with Mega Pixel has appeared, and it is estimated that the camera phone with Mega Pixel will take up to 28% of total phone sales if it is released in the end of year 2004. Since the inspection of finished products is done manually, it is major obstacle in production increment In this paper, to solve these problems, we developed the imaging processing algorithm to inspect the defects in captured image of assembled CCM. The performances of the developed inspection system and we can recognize various types of defect of CCM modules with good accuracy and high speed

• 사회경제평론
• /
• 제38호
• /
• pp.129-161
• /
• 2012

이 논문은 헤지펀드 등 금융기관들의 금융적 투기가 효율시장가설의 주장과 달리 상품시장의 가격변동과 왜곡을 발생시킬 수 있고, 따라서 이러한 시장에 대한 엄격한 규제가 필요하다는 것을 주장한다. 효율시장가설은 헤지펀드가 가격위험을 헤징하고 정확한 가격을 발견하는데 중요한 역할을 한다고 주장하지만, 이 글은 이와 반대로 선물시장에서 헤지펀드의 거래가 증가할수록 가격이 장기균형가격으로 수렴하는 속도가저하되는 등의 왜곡현상이 나타난다고 주장한다. 또한 선물시장에서의 투기적 거래가 역사적인 수준으로부터 크게 벗어나지 않았다는 주장과달리, 과잉투기(excessive speculation)가 존재하였으며 과잉투기를 이끈 헤지펀드 등에 의해 선물가격이 비정상적으로 폭등하였다. 선물시장에서의 가격폭등은 현물-선물등가법칙에 의해 곧바로 현물시장의 가격폭등을 유발시키고, 그 결과 경제 전체적으로 나쁜 영향을 주게 된다.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2004년도 ICEIC The International Conference on Electronics Informations and Communications
• /
• pp.405-409
• /
• 2004

The Pocket PC has become more popular in market because of the advantages of its small size and convenience for regular customers. Pocket PC is a mobile device so that we can receive the benefits of shared data over a wireless network. Enabling us to transmit data to a central location, simply messaging from one point to the next, its ability to share information across a wireless platform is becoming central to our communication needs. However, using Windows CE - an embedded operating system, as well as being designed for mobile users, there are many limitations to memory and speed of arithmetic operations on Pocket PC. As a result, developers have to deal with many difficulties in managing information storage when developing applications, especially Geography Information System (GIS) applications. In this paper, we propose some efficient methods to store GIS data and to increase the speed of displaying maps in GIS applications developed on Pocket PC and Windows CE 3.0.

• 유공압시스템학회논문집
• /
• 제4권1호
• /
• pp.18-24
• /
• 2007

The continuously variable transmission (CVT) of which speed ratio can change continuously in a fixed range has the benefits of low fuel consumption and exhaust gas because it enables the engine of a vehicle to operate in a high efficiency range regardless of vehicle speed. The speed ratio of belt type CVT is controlled by adjusting line pressure. The one of the line pressure control methods, mechanical-hydraulic control is usually adopting VDT's control method, in which the secondary solenoid valve has two functions both a regulator and a line pressure controller. However, this control method could not show the high performance of CVT with optimal driving capability because of the limitation of simple control algorithm, and it could not gain market share sufficiently in spite of the advantage of CVT with low fuel consumption. On the other hand, the electro-hydraulic control method gives the enhancement of power performance and low fuel consumption by implementing various driving mode using the proportional control or PWM control. The key of CVT technique is to develop a control algorithm of the electro-hydraulic solenoid valve in order to implement the speed ratio efficiently. In this paper, the line pressure control algorithm is proposed and the hydraulic system is controlled using metal belt type CVT test rig and the embedded ECU platform.

• 유통과학연구
• /
• 제13권8호
• /
• pp.81-90
• /
• 2015

Purpose - To vitalize a market or develop a new one, companies frequently release new products into the market, often by shortening the time to market, called the release period. This research aims to investigate the purchase intention behavior of consumers in terms of buying new products at the time of product release based on the release speed. Research Design, Data, and Methodology - The research reviews the influence of relative advantage, complexity, and compatibility among innovative attributes of new products, as proposed by Rogers. Moreover, it examines the moderating effect of the innovative new product attributes in terms of speed of obsolescence of old products and how that influences consumer purchase behavior. Additionally, this study tests the research hypotheses using empirical analysis. Results - The analysis demonstrated that the relative predominance (H1) and suitability (H3) of new products had a statistically significant positive influence on new product purchase intention. However, the complexity (H2) of new products had a statistically significant positive influence on new product purchase intention in contrast to its predicted sign (-). The results of the moderating effect of the old product use period were as follows. H4-1 was not supported since the difference between the path coefficients of the group with the low level old product use period and the group with the high level, represented by the relationship of relative predominance and new product purchase intention, was not statistically significant. H5-1 was also not supported since the difference between the path coefficients of the group with the low level of old product use period and the group with the high level, represented by the relationship of complexity and new product purchase intention, was not statistically significant. However, H4-2 was supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of relative advantage and new product purchase intention was statistically significant. H5-2 was not supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of complexity and new product purchase intention, was not statistically significant. H6-2 was also not supported since the difference between the path coefficients of the group with the low level of old product use frequency and the group with the high level, represented by the relationship of compatibility and new product purchase intention, was not statistically significant. Conclusion - According to the results, only H4-2 among the hypotheses on the moderating effect of the old product use period and use frequency was statistically significant. Future research should focus on carrying out a detailed review of the hypothesis on the moderating effect of the old product usage period and frequency, find the cause, and connect this to potential new research.