• KSII Transactions on Internet and Information Systems (TIIS)
• /
• 제16권10호
• /
• pp.3419-3437
• /
• 2022

Anonymization technology is an important technology for privacy protection in the process of data release. Usually, before publishing data, the data publisher needs to use anonymization technology to anonymize the original data, and then publish the anonymized data. However, for data publishers who do not have or have less anonymized technical knowledge background, how to configure appropriate parameters for data with different characteristics has become a more difficult problem. In response to this problem, this paper adds a historical configuration scheme resource pool on the basis of the traditional anonymization process, and configuration parameters can be automatically recommended through the historical configuration scheme resource pool. On this basis, a privacy model hybrid recommendation algorithm for user satisfaction is formed. The algorithm includes a forward recommendation process and a reverse recommendation process, which can respectively perform data anonymization processing for users with different anonymization technical knowledge backgrounds. The privacy model hybrid recommendation algorithm for user satisfaction described in this paper is suitable for a wider population, providing a simpler, more efficient and automated solution for data anonymization, reducing data processing time and improving the quality of anonymized data, which enhances data protection capabilities.

• Composites Research
• /
• 제34권5호
• /
• pp.269-276
• /
• 2021

프리프레그 압축성형(PCM, Prepreg Compression Molding) 공정은 고품질 CFRP(Carbon Fiber Reinforced Plastic) 제품을 제조할 수 있는 고속성형기술이다. 오토클레이브 공정에 비해 폐기물 발생이 적고 사이클타임을 크게 줄일 수 있어 항공우주 및 자동차 산업에서 다양한 연구가 진행되고 있다. 본 연구에서는 PCM 공정의 품질을 높이기 위해 프리프레그의 경화거동을 따라 프레스의 압축압력을 단계별로 증가시키는 성형법에 대해 연구하였고, 이러한 다단 압축 성형법이 우수한 품질의 CFRP 제품을 생산하고 사이클타임을 단축할 수 있는 좋은 수단임을 확인하였다. 그리고 상온에서 적층한 프리프레그를 금형에 투입하여 예열과 성형을 동시에 함으로써 별도의 예열 공정 없이 제품을 성형할 수 있었다. 또한 평판 성형에 최적화된 공정조건을 3차원 형상물에 동일하게 적용한 결과 외관상 평판과 유사한 제품을 공정조건 수립 과정 없이 만들 수 있었다.

• 반도체디스플레이기술학회지
• /
• 제20권4호
• /
• pp.171-176
• /
• 2021

Die-to-wafer (D2W) hybrid bonding in the multilayer semiconductor manufacturing process is one of wafer direct bonding, and various studies are being conducted around the world. A noteworthy point in the current die-to-wafer process is that a lot of voids occur on the bonding surface of the die during bonding. In this study, as a suggested method for removing voids generated during the D2W hybrid bonding process, a flexible mechanism for implementing convex for die bonding to be applied to the bond head is proposed. In addition, modeling of flexible mechanisms, analysis/design/control/evaluation of static/dynamics properties are performed. The proposed system was controlled by capacitive sensor (lion precision, CPL 290), piezo actuator (P-888,91), and dSpace. This flexure mechanism implemented a working range of 200 ㎛, resolution(3σ) of 7.276nm, Inposition(3σ) of 3.503nm, settling time(2%) of 500.133ms by applying a reverse bridge type mechanism and leaf spring guide, and at the same time realized a maximum step difference of 6 ㎛ between die edge and center. The results of this study are applied to the D2W hybrid bonding process and are expected to bring about an effect of increasing semiconductor yield through void removal. In addition, it is expected that it can be utilized as a system that meets the convex variable amount required for each device by adjusting the elongation amount of the piezo actuator coupled to the flexible mechanism in a precise unit.

• 지식경영연구
• /
• 제13권3호
• /
• pp.55-77
• /
• 2012

Selecting promising technology is becoming more and more difficult due to the increased number and complexity. In this study, we propose hybrid AHP/DEA-AR method and hybrid AHP/DEA-AR-G method to evaluate efficiency of technology alternatives based on ordinal rating data collected through survey to technology experts in a certain field and select efficient technology alternative as promising technology. The proposed method normalizes rating data and uses AHP to derive weights to improve the credibility of analysis, then in order to avoid basic DEA models' problems, use DEA-AR and DEA-AR-G to evaluate efficiency of technology alternatives. In this study, we applied the proposed methods to clean technology and compared with the basic DEA models. According to the result of the comparison, we can find that the both proposed methods are excellent in confirming most efficient technology, and hybrid AHP/DEA-AR method is much easier to use in the process of technology selection.

• 문화기술의 융합
• /
• 제10권3호
• /
• pp.421-426
• /
• 2024

계층화분석과정(analytic hierarchy process, AHP)는 쌍대비교를 이용하여, 사람들의 판단기준을 객관적인 수치로 변환해준다. 그런데 너무 많은 쌍대비교를 필요로 한다는 점이 문제이다. 본 연구의 목적은 표준 AHP보다 간편하면서도, 결과물은 유사하게 나오는 새로운 방식의 의사결정지원시스템을 만드는 것이다. 기존 연구들은 복잡한 쌍대비교 과정을 감소시키기 위하여 과정 분리(process separation) 방식을 가장 많이 사용하였다. 본 연구가 채택한 과정 분리 방법은 "분리와 혼합 방식"이다. 즉, 1)판단기준을 평가할 때는 정규 AHP 과정을 사용하고, 2)대안을 비교평가 할 때는 다속성효용모형(multi-attributive utility technique, MAUT)을 적용한다. 이 Hybrid 모형의 과정 감축효과를 이론적으로 도출하기 위하여 정보입력 횟수를 계산하는 산식을 만들었다. 그런 다음, 이 AHP-MAUT Hybrid 모형을 실제 분석 사례인 경기도 주민들이 분당-강남역 간 통근할 때 어떤 교통수단들을 선택하는지 분석하는 사례에 적용하였다. 그 결과 Hybrid 모형을 적용할 때 계산과정이 AHP 모형을 사용했을 때와 비교하여 42.03% 감소하였다. 그리고 Hybrid model을 적용한 주민들의 선택 결과와 표준 AHP를 이용한 주민들의 선택 결과를 서로 비교하였다. 혼동모형에서 도출한 두 모형 간의 선택 일치도(CA)는 82.1%로서, 상당한 정도로 일관성이 있다 할 수 있을 정도였다. 결론적으로 본 연구가 목적하는 바는 AHP보다 간단하고, 편리하면서도 동등하게 효과적인 의사결정지원시스템을 개발하는 것인데, AHP-MAUT Hybrid 모형이 그 목적에 부합하였다. 이런 결과에 힘입어 Hybrid 모형의 적용사례가 증가한다면, 그것이 표준 AHP의 대안 중 하나로 고려될 수 있다는 점이 본 연구의 기여이다.

• 공업화학
• /
• 제34권6호
• /
• pp.608-612
• /
• 2023

탄소블록의 열전도도를 증가시키기 위하여 탄소블록 제조 공정 중 nano-diamond (ND)를 첨가하였다. 첨가된 ND는 탄화 과정에서 바인더 피치의 휘발로 인하여 생성된 탄소블록의 기공을 제어하였다. ND의 첨가는 코크스 및 바인더 피치의 혼련 공정에 추가하였으며, 성형, 탄화를 거쳐 탄소블록을 제조하였다. 첨가된 ND의 양이 증가할수록 탄소블록의 ND 비율이 증가하였다. 첨가된 ND는 탄화 과정에서 바인더 피치의 휘발로 인하여 발생하는 가스의 이동 통로 역할을 하여 탄소블록의 밀도를 높이고, 기공률을 감소시켰다. ND의 첨가를 통하여 높아진 밀도, 낮아진 기공률, ND의 높은 열전도도를 통하여 탄소블록의 열전도도를 향상시킬 수 있었다.

• 한국생산제조학회지
• /
• 제20권2호
• /
• pp.214-218
• /
• 2011

In order to survive in turbulent and competitive markets, automotive part manufacturers try efforts to develop new manufacturing technologies for ultra-lightweight, high-intensity and environmentally-friendly parts. Most of front lower arm is manufactured by welding process between upper- and lower panel which are produced by press stamping process. Because lower arm mounted on the cross member parts is one of the important complementary parts. So, to improve safety and lightweight of these parts, hybrid technologies are used in this paper. As hybrid technologies are applied to be front sub-frame, rear cross member and other chassis parts as well as front lower arm, the 20% lightweight has been achieved compared with existing steel parts.

• 한국환경과학회지
• /
• 제23권9호
• /
• pp.1627-1634
• /
• 2014

Odor control technology include absorption, adsorption, incineration and biological treatments. But, most of processes have some problems such as secondary organic acids discharge at the final odor treatment facility. In order to solve the problems for effective treatment of organic acids in odor, it is necessary to develop a new type advanced odor control technology. Some of the technology are plasma only process and plasma hybrid process as key process of the advanced technology. In this study, odor removal performance was compared DBD(Dielectric Barrier Discharge)plasma process with PCHP(plasma catalysis hybrid process) by gaseous ammonia, formaldehyde and acetic acid. Plasma only process by acetic acid obtained higher treatment efficiency above 90%, and PCHP reached its efficiency up to 96%. Acetic acid is relatively easy pollutant to control its concentration other than sulfur and nitrogen odor compounds, because it has tendency to react with water quickly. To test of the performance of DBD plasma process by applied voltage, the tests were conducted to find the dependence of experimental conditions of the applied voltage at 13 kV and 15 kV separately. With an applied voltage at 15 kV, the treatment efficiency was achieved to more higher than 13 kV from 83% to 99% on ammonia, formaldehyde and acetic acid. It seems to the odor treatment efficiency depends on the applied voltage, temperature, humidity and chemical bonding of odors.

• Design & Manufacturing
• /
• 제14권4호
• /
• pp.71-77
• /
• 2020

Various manufacturing technologies, including over-molding and insert-injection molding, are used to produce hybrid plastics and metals. However, there are disadvantages to these technologies, as they require several steps in manufacturing and are limited to what can be reasonably achieved within the complexities of part geometry. This study aims to determine a practical approach for producing metal/plastic hybrid components by combining plastic injection molding and metal die casting to create a new hybrid metal/plastic molding process. The integrated metal/plastic hybrid injection molding process developed in this study uses the proven method of multi-component technology as a basis to combine plastic injection molding with metal die casting into one integrated process. In this study, the electrical conductivity and ampacity were verified to qualify the new process for the production of parts used in electronic devices. The electrical conductivity was measured, contacting both sides of the test sample with constant pressure, and the resistivity was measured using a micro ohmmeter. Also, the specific conductivity was subsequently calculated from the resistivity and contact surface of the conductor path. The ampacity defines the maximum amount of current a conductive path can carry before sustaining immediate or progressive deterioration. The manufactured hybrid multi-components were loaded with increasing currents, while the temperature was recorded with an infrared camera. To compare the measured infrared images, an electro-thermal simulation was conducted using commercial CAE software to predict the maximum temperature of the power loaded parts. Overall, during the injection molding process, it was demonstrated that multifunctional parts can be produced for electric and electronic applications.

• 한국군사과학기술학회지
• /
• 제11권4호
• /
• pp.83-91
• /
• 2008

The development of the equal channel angular pressing(ECAP) process in metals has recently provided a feasible solution to produce ultra-fine or nano-grained bulk materials with tailored material properties. However, ECAP process is difficult to scale up commercially due to requirements of an excessive load. In this paper, a new Hybrid-ECAP process with torsional die is considered to obtain materials of ultra-fine grain structure under low forming load. An upper bound analysis and numerical simulation (DEFORM 3D, a commercial FEM code) are carried out on the torsional die. By the upper bound analysis, analytical expression for the compression force and rotation speed are obtained. By the FEM analysis, the distribution of strain, stress and deformation are obtained. These results show that the Hybrid-ECAP is a useful process because this process can obtain the homogeneous deformations with relatively low forming load. Additionally, due to decreased forming load, die life can be improve.