• 산업공학
• /
• 제19권1호
• /
• pp.53-61
• /
• 2006

We propose a new supply chain planning methodology for both a manufacturer and a distributor in order to find a global supply chain plan for functional product markets. Functional products as opposed to innovative products include the staples that people buy regularly from their nearby places to satisfy basic needs. In the functional product market, the distributor has an initiative of supply chain control and planning with a freedom to request any profit maximizing order quantities until the manufacturer refuses, whereas the manufacturer may not provide more than requested. In this paper, two independent agents on behalf of the manufacturer and the distributor are introduced, and supply chain planning can be conducted by collaboration between them. In addition, mathematical models and a numerical example are presented to show the possibility of the proposed methodology.

• 정보보호학회논문지
• /
• 제7권2호
• /
• pp.73-92
• /
• 1997

모듈라 멱승 연산(M$^{E}$ modN)은 공개키 암호시스템에 있어서 가장 기본적이고 중요한 연산들 중 하나이다. 그런데 이는 512-비트 이상의 정수들과 같이 매우 큰 수들을 다루기 때문에, 수행속도가 느려서 빠른 연산 알고리즘을 필요로 한다. 모듈라 멱승 연산은 모듈라 곱셈의 반복 수행으로 이루어져있고, 이 때의 반복횟수는 지수(E)에 대한 덧셈사슬의 길이에 의해 결정된다. 따라서, 모듈라 멱승 연산을 빠르게 수행하기 위한 방법에는 두 가지가 있을 수 있다. 하나는 보다 짧은 덧셈사슬을 구함으로써 모듈라 곱셈의 반복횟수를 줄이는 것이고, 다른 하나는 각각의 모듈라 곱셈을 빠르게 수행하는 것이다. 본 논문에서는 하나의 덧셈사슬 휴리스틱과 두 개의 모듈라 곱셈 알고리즘들을 제안한다. 두개의 모듈라 곱셈 알고리즘들 중 하나는 서로 다른 두 수들 간의 모듈라 곱셈을 빠르게 수행하기 위한 것이고, 다른 하나는 모듈라 제곱을 빠르게 수행하기 위한 것이다. 본 논문에서 제안하는 덧셈사슬 휴리스틱은 기존의 알고리즘들보다 짧은 덧셈사슬을 찾을 수 있다. 본 논문에서 제안하는 모듈라 곱셈 알고리즘들은 기존의 알고리즘들 보다 1/2 이하의 단정도 곱셈만으로 모듈라 곱셈을 수행한다. 실제로 PC에서 구현하여 수행한 결과, 기존의 알고리즘들 중 가장 좋은 성능을 보이는 Montgomery 알고리즘에 비해 30~50%의 성능향상을 보인다.

• Journal of Advanced Marine Engineering and Technology
• /
• 제31권3호
• /
• pp.215-223
• /
• 2007

When the propulsion shafting system of marine diesel engine is designed. the vibratory stresses on shafts should be reviewed and be satisfied with limits which are laid down by classification societies In addition. the torsional vibration aspects for crankshaft of main engine are requested to be checked by engine designers. Especially. for the 4, 5, and 6-cylinder engines. the 2nd order moment compensator(s) may be installed to compensate the external moments of engine and not to excite the hull girder vibration. This moment compensator which is mounted on fore and/or after-end of engine is driven by the roller chain drive for some of MAN 2-stroke diesel engines. While the engine is running, the roller chain Is worn down, which causes the extension of roller chain. The chain therefore should be checked and tightened by periods in order to keep its functionality. However. when the torsional angular acceleration of chain drive exceeds the certain limit. the chain will suffer the excessive slack and transverse vibration. This may cause fatigue, wear or damage on the chain and the chain ultimately may be broken. The research object of this thesis is to review factors which affect the angular acceleration of chain drive and to find out how to decrease the angular acceleration of driving chain by checking factors which have a major contribution to acceleration reduction using the statistical method of DOE(design of experiment), correlation analysis and regression analysis methods.

• Carbon letters
• /
• 제25권
• /
• pp.55-59
• /
• 2018

Carbon chain inserted carbon nanotubes (CNTs) have been experimentally proven having undergone pronounced property change in terms of electrical conductivity compared with pure CNTs. This paper simulates the geometry of carbon chain inserted CNTs and analyzes the mechanism for conductivity change after insertion of carbon chain. The geometric simulation of Pt doped CNT was also implemented for comparison with the inserted one. The results indicate that both modification by Pt atom on the surface of CNT and addition of carbon chain in the channel of the tube are effective methods for transforming the electrical properties of the CNT, leading to the redistribution of electron and thereby causing the conductivity change in obtained configurations. All the calculations were obtained based on density functional theory method.

• 경영과학
• /
• 제30권1호
• /
• pp.149-165
• /
• 2013

This study empirically investigated the changes of performance evaluation systems under the environment of supply-chain e-commerce. The objectives of e-commerce include obtaining financial profit, internal innovation through processes integration, learning with information flow, and customer satisfaction through quick response. These objectives are generally consistent with the four evaluation measures of balanced scorecard(BSC). This study, first, demonstrated that perceived environmental uncertainty(PEU) has a significant effect on the adoptions of e-commerce and BSC, and severe competition positively influences the use of e-commerce. With cluster analysis and subgroup analysis, we also showed that under the high adoption levels of e-commerce, the high utilization of BSC can improve the supply-chain performance of a firm. In addition, it was found that the use of e-commerce indirectly and significantly affects supply-chain performance through inter-organizational information flow, and the supply-chain performance of a firm leads to the improvement of organizational performance.

• 디지털산업정보학회논문지
• /
• 제14권2호
• /
• pp.11-17
• /
• 2018

IDS/IPS and networked computer systems are playing an increasingly important role in our society. They have been the targets of a malicious attacks that actually turn into intrusions. That is why computer security has become an important concern for network administrators. Recently, various Detection/Prevention System schemes have been proposed based on various technologies. However, the techniques, which have been applied in many systems is useful for existing intrusion patterns on standard-only systems. Therefore, probe detection of private clouds using BlockChain has become a major security protection technology to detection potential attacks. In addition, BlockChain and Probe detection need to take into account the relationship between the various factors. We should develop a new probe detection technology that uses BlockChain to fine new pattern detection probes in cloud service security in the end. In this paper, we propose a probe detection using Fuzzy Cognitive Map(FCM) and Self Adaptive Module(SAM) based on service security using BlockChain technology.

• 미생물학회지
• /
• 제47권4호
• /
• pp.328-334
• /
• 2011

Leucine zipper motif는 여러 개의 주기적인 leucine 잔기로 구성되어 amphipathic alpha helix형태의 구조를 나타내며 소수성 결합에 의해 이량체를 형성한다. 이 leucine zipper motif를 single chain Fv 항체의 C-terminus에 도입하면 leucine zipper motif의 소수성 결합에 의해 amphipathic alpha helix의 이량체가 형성되면서 융합된 single chain Fv 항체의 이량체 (Dimer) 형성 또한 유도할 수 있다. 이량체 형태의 single chain Fv 항체는 2개의 항원 결합부위를 갖게 되므로 단량체 형태의(monomer) single chain Fv 항체에 비해 항원 결합력(Avidity)이 증가 될 것이다. 이 개념에 기초하여 이전 연구에서 제조된 단량체 형태인 닭 single chain Fv 항체인 8C3 ScFv 항체의 C-terminus에 leucine zipper motif를 도입하여 이량체 형태의 8C3 ScFv 항체를 개발하였다. 이량체 8C3 ScFv 항체는 가금류의 대표적인 기생충 질병인 coccidiosis를 유발하는 Eimerian sporozoite에 특이적으로 결합하는 기능을 나타내었다. 또한 이량체 8C3 ScFv 항체는 avidity 증가로 인하여 단량체에 비해 항원 결합력이 약 3배 증가됨을 확인할 수 있었으며 단백질 회수율 또한 2배 증가되는 부수적인 효과를 얻을 수 있었다.

• 유통과학연구
• /
• 제20권10호
• /
• pp.93-103
• /
• 2022

Purpose: This study aims to determine the relationship between disruptive factors and customer satisfaction at chain stores. Survey-based questionnaires were designed in the distribution technique to measure the findings in this study. Research design, data, and methodology: In terms of the sampling technique, the researchers adopted the simple random sampling technique with a total of 200 sample sizes. For the statistical method, the researchers applied multiple linear regression analysis to determine the potential factors that affect customer satisfaction at chain stores. The analysis of this study measured how product quality, pricing policies of chain stores, design and layout, responsiveness, and location of chain stores impart their roles in customer satisfaction. Results: This study found a significant relationship between the product quality and location of chain stores on customer satisfaction. In addition, the responsiveness, pricing policy, and physical design of chain stores impart an insignificant role in customer satisfaction. However, it is proven that the location of chain stores and product quality positively impact customer satisfaction. Conclusions: The study is geographically limited to the region of Karachi, Pakistan. Therefore, the findings may differ in the context of study implications in the other areas.

• Asian-Australasian Journal of Animal Sciences
• /
• 제33권7호
• /
• pp.1180-1190
• /
• 2020

Objective: To develop healthier comminuted meat products to meet consumer demand, the gel properties, rheological properties, microstructure and water distribution of pork meat batters formulated with various amounts of bamboo shoot dietary fiber (BSDF) were investigated. Methods: Different levels of BSDF (0% to 4%) were added to pork batters, and the pH, color, water-holding capacity, texture and rheological properties of pork batters were determined. Then, pork batters were analyzed for their microstructure and water distribution using scanning electron microscopy (SEM) and low-field nuclear magnetic resonance (LF-NMR). Results: Compared with the control, BSDF addition into meat batters showed a significant reduction in L^*-value and a significant increase in b^*-value (p<0.05). BSDF addition of up to 4% reduced the pH value of pork batters by approximately 0.15 units; however, the cooking loss and expressible water loss decreased significantly (p<0.05) with the increased addition of BSDF. The hardness and gel strength were noticeably enhanced (p<0.05) as the content of BSDF increased. The rheological results showed that BSDF added into pork batters produced higher storage modulus (G') and loss modulus (G") values. The SEM images suggested that the addition of BSDF could promote pork batters to form a more uniform and compact microstructure. The proportion of immobilized water increased significantly (p<0.05), while the population of free water was decreased (p<0.05), indicating that BSDF improved the water-holding capability of pork batters by decreasing the fraction of free water. Conclusion: BSDF could improve the gel properties, rheological properties and water distribution of pork meat batters and decrease the proportion of free water, suggesting that BSDF has great potential as an effective binder in comminuted meat products.

• 한국응용과학기술학회지
• /
• 제32권3호
• /
• pp.394-404
• /
• 2015

This study investigated the pharmacodynamics of betaine on the blood profile and short chain fatty acid levels in meat ducks exposed to heat wave. 400 heads of Cherry valley (Anasplatyrhynchos) meat ducks were completely randomized to 5 treatments (4 repetitions each), and were raised for 42 days. They were grouped into T1 (heat wave control group without betaine), T2 (betaine 400 ppm), T3 (betaine 800 ppm), T4 (betaine 1200 ppm), and T5 (normal control group without betaine). Compared to T1, the betaine addition groups showed higher body weight gain at shipment, with T3 showing the highest significant difference. For hematological indictors measured (red blood cells and platelets), the betaine addition groups showed significantly higher values than the heat wave control group. The pH of the former was lower but their electrolytes ($K^+$, $P^+$, and $Cl^-$) were significantly higher compared to the latter. For blood gas concentration, the former showed a significantly higher value than the latter. For the total short chain fatty acids, acetic acid, and propionic acid, the betaine addition groups and group fed broiler-high temperature diet showed higher values than the heat wave control group. On the other hand, the former showed significantly lower values in butyric acid, isobutyric acid, valeric acid, and isovaleric acid than the latter group. These results suggest that betaine has the pharmacodynamics that mediate heat stress, via the maintenance and control of the blood profile, osmotic pressure, gas concentration, and short chain fatty acid, of meat ducks under heat wave.