• 정보관리학회지
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• 제28권2호
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• pp.79-96
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• 2011

인용분석은 학자들의 연구실적 평가에 가장 많이 사용되는 방법 중 하나이지만 비평가들은 오늘날의 인용분석 자료와 방법론에 근본적인 문제가 있다고 주장한다. 전통적 인용분석 방식은 인용품질과 인용소음뿐만 아니라 언어, 시간, 문화와 같은 비수치적인 요소들을 고려하지 않아 단순하고 그릇된 평가를 가져올 수 있으며, 적용 범위가 각각 다르고 불완전한 인용 데이터베이스들은 충돌적인 인용분석결과를 초래하기 쉬울 수 있다. 이러한 문제들을 해결하려면 포괄적인 인용데이터를 다 방면과 다 방식으로 분석하는 새로운 인용분석연구가 필요하다. 본 논문은 Web of Science, Scopus와 Google Scholar를 비교 분석한 연구의 결과를 논의하며 기존의 인용분석 방법의 약점을 극복하기 위해 설계한 CiteSearch라는 프로토타입 시스템을 간략하게 설명한다.

• 지능정보연구
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• 제7권1호
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• pp.177-197
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• 2001

IMF이후로 우리나라의 은행들은 현재 큰 구조조정을 맞이하고 있으며 이 속에서 살아남기 위하여 나름대로의 전략을 수립하고 있다 예를 들어 모 은행의 경우에는 평균 잔액이 일정수준을 넘지 아니하는 경우에는 고객들에게 이자를 지급하지 않는 전략을 수립하고 있다. 이에 기존의 고객의 유형을 분석하고 이를 전략에 활용하는 연구의 필요성이 높아지고 있다. 기존의 연구를 살펴보면 은행 고객들의 유형을 설문지 분석방법에 의존하여 몇 개의 군집으로 분류하고 이들의 집단별 특성을 연구하고자 하였다. 하지만 설문데이터의 경우 고객들의 실제적인 행동이 반영되지 못하는 한계점을 가지고 있다. 이에 본 연구에서는 C은행의 실제 고객 자료를 통하여 다양한 데이터마이닝 기법을 적용하여 가계성 예금 고객을 세분화하였다. 또한 세분화된 고객을 중심으로 이들이 가계성 예금을 해지하고 다른 은행으로 이탈하는 집단의 특성을 분류하고 규칙을 도출하였다. 또한 이들을 관리하는 전략을 제시하였다.

• 산업경영시스템학회지
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• 제40권1호
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• pp.41-49
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• 2017

Process quality control, which prevents problems and risks that may occur in products and processes, has been recognized as an important issue, and SPC techniques have been used for this purpose. Process Capability Index (PCI) is useful Statistical Process Control (SPC) tool that is measure of process diagnostic and assessment tools widely use in industrial field. It has advantage of easy to calculate and easy to use in the field. $C_p$ and $C_{pk}$ are traditional PCIs. These traditional $C_p$ and $C_{pk}$ were used only as a measure of process capability, taking into account the quality variance or the bias of the process mean. These are not given information about the characteristic value does not match the target value of the process and this has the disadvantage that it is difficult to assess the economic losses that may arise in the enterprise. Studies of this process capability index by many scholars actively for supplement of its disadvantage. These studies to evaluate the capability of situation of various field has presented a new process capability index. $C_{pm}$ is considers both the process variation and the process deviation from target value. And $C_{pm}{^+}$ is considers economic loss for the process deviation from target value. In this paper we developed an improved Expected Loss Capability Index using Reflected Normal Loss Function of Spring. This has the advantage that it is easy to realistically reflect the loss when the specification is asymmetric around the target value. And check the correlation between existing traditional process capability index ($C_{pk}$) and new one. Finally, we propose the criteria for classification about developed process capability index.

• 산업경영시스템학회지
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• 제40권2호
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• pp.129-136
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• 2017

Among the information technology and automation that have rapidly developed in the manufacturing industries recently, tens of thousands of quality variables are estimated and categorized in database every day. The former existing statistical methods, or variable selection and interpretation by experts, place limits on proper judgment. Accordingly, various data mining methods, including decision tree analysis, have been developed in recent years. Cart and C5.0 are representative algorithms for decision tree analysis, but these algorithms have limits in defining the tolerance of continuous explanatory variables. Also, target variables are restricted by the information that indicates only the quality of the products like the rate of defective products. Therefore it is essential to develop an algorithm that improves upon Cart and C5.0 and allows access to new quality information such as loss cost. In this study, a new algorithm was developed not only to find the major variables which minimize the target variable, loss cost, but also to overcome the limits of Cart and C5.0. The new algorithm is one that defines tolerance of variables systematically by adopting 3 categories of the continuous explanatory variables. The characteristics of larger-the-better was presumed in the environment of programming R to compare the performance among the new algorithm and existing ones, and 10 simulations were performed with 1,000 data sets for each variable. The performance of the new algorithm was verified through a mean test of loss cost. As a result of the verification show, the new algorithm found that the tolerance of continuous explanatory variables lowered loss cost more than existing ones in the larger is better characteristics. In a conclusion, the new algorithm could be used to find the tolerance of continuous explanatory variables to minimize the loss in the process taking into account the loss cost of the products.

• 산업경영시스템학회지
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• 제41권1호
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• pp.118-127
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• 2018

Recently, service quality must reflect several demands of customers who show rapid and various changes so as to be compared with the past. So, objective and rapid measuring methods for service quality are necessary. For them, first of all, service company must calculate their standard of service quality accurately by measuring service quality exactly. Kano classified the degree of influence that is the degree of correspondence of the quality attributes of products and services to the subjective satisfaction of customers. As a result, the types of qualities are classified as attractive, must be, one dimensional, and indifference attributes. They have been widely used quality attributes in various industrial fields up to now. However, Kano model has a limit that it ignores the characters of the next frequent numbers even though there are not much gap comparing to the most frequent number in the questionnaire answers. The limit is attributed to the character of Kano model that the most frequent number is accepted as the only quality character. Timko calculated the customer satisfaction coefficient by using Kano's method and studied the differences in quality character by classifying the quality characteristics in a graphical way through the relationship between the satisfaction and the dissatisfaction coefficient. In this study, we used the quality level determination method of the 7-point Likert scale, which takes the weight into account, to complement the deficiencies of the existing Kano model. We also developed and applied a Potential Satisfaction Level (P) and Potential Customer Demand Improvement (PCDI) Index to present a new approach to the determination of service quality attributes. To measure the level of potential service satisfaction and to understand the degree of improvement, we collected specimens of 51 participants who has been trained in the National Strategy Business Training Program, which has been managed by government agent, and analyzed the results.

• 한국산학기술학회논문지
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• 제16권11호
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• pp.7541-7548
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• 2015

Wireless Sensor Networks 기술은 노드들을 다양한 지역에 분포시킴으로서, 군사적 목적의 탐색 역할은 물론 산업에서의 기기 관리, 공정 관리, 특정 지역 모니터링 등 다양한 분야에 활용이 가능한 기술이다. 하지만, 무선 센서 네트워크 환경에서 센서 노드의 경우 초소형 하드웨어를 사용함에 따른 에너지, 처리 능력, 메모리 저장능력 등의 한계점을 가지고 있으며, 이러한 한계를 극복하기 위해 다양한 라우팅 프로토콜 방법이 제안되었다. 하지만, 기존 라우팅 프로토콜의 경우 에너지 효율성에 초점을 둠으로서 상호간 통신할 때, 보안에 매우 취약하며, 이를 극복하기 위해 기존의 암호화 시스템을 도입하기에는 센서의 처리 능력 과 메모리 등에 한계점을 가지고 있다. 따라서, 본 논문에서는 에너지 효율성을 고려하면서 동시에 통신 과정에서 상호인증 기법 및 키 생성과 갱신 시스템을 도입함으로서 다양한 보안위협에 대응할 수 있는 상호인증 방법을 제안한다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.2964-2985
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• 2019

Global data center IP traffic is expected to reach 20.6 zettabytes (ZB) by the end of 2021. Intra-data center networks (Intra-DCN) will account for 71.5% of the data center traffic flow and will be the largest portion of the traffic. The understanding of traffic distribution in IntraDCN is still sketchy. It causes significant amount of bandwidth to go unutilized, and creates avoidable choke points. Conventional transport protocols such as Optical Packet Switching (OPS) and Optical Burst Switching (OBS) allow a one-sided view of the traffic flow in the network. This therefore causes disjointed and uncoordinated decision-making at each node. For effective resource planning, there is the need to consider joining the distributed with centralized management which anticipates the system's needs and regulates the entire network. Methods derived from Kalman filters have proved effective in planning road networks. Considering the network available bandwidth as data transport highways, we propose an intelligent enhanced SDN concept applied to OBS architecture. A management plane (MP) is added to conventional control (CP) and data planes (DP). The MP assembles the traffic spatio-temporal parameters from ingress nodes, uses Kalman filtering prediction-based algorithm to estimate traffic demand. Prior to packets arrival at edges nodes, it regularly forwards updates of resources allocation to CPs. Simulations were done on a hybrid scheme (1+1) and on the centralized OBS. The results demonstrated that the proposition decreases the packet loss ratio. It also improves network latency and throughput-up to 84 and 51%, respectively, versus the traditional scheme.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제16권12호
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• pp.3836-3854
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• 2022

The student group division is benefit for universities to do the student management based on the group profile. With the widespread use of student smart cards on campus, especially where students living in campus residence halls, students' daily activities on campus are recorded with information such as smart card swiping time and location. Therefore, it is feasible to depict the students with the daily activity data and accordingly group students based on objective measuring from their campus behavior with some regular student attributions collected in the management system. However, it is challenge in feature representation due to diverse forms of the student data. To effectively and comprehensively represent students' behaviors for further student group division, we proposed to adopt activity data from student smart cards and student attributes as input data with taking account of activity and attribution relationship types from different perspective. Specially, we propose a novel student group division method based on a multi-view student attribute heterogeneous information network (MSA-HIN). The network nodes in our proposed MSA-HIN represent students with their multi-dimensional attribute information. Meanwhile, the edges are constructed to characterize student different relationships, such as co-major, co-occurrence, and co-borrowing books. Based on the MSA-HIN, embedded representations of students are learned and a deep graph cluster algorithm is applied to divide students into groups. Comparative experiments have been done on a real-life campus dataset collected from a university. The experimental results demonstrate that our method can effectively reveal the variability of student attributes and relationships and accordingly achieves the best clustering results for group division.

• 한국구조물진단유지관리공학회 논문집
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• 제27권5호
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• pp.57-66
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• 2023

사회기반시설의 자산가치 평가는 자산의 효율적인 관리를 위한 합리적인 의사결정에 필수적이며, 자산을 올바르게 인식하기 위한 지표가 될 수 있다. 국내 자산가치 평가는 일반적으로 정액법 기반의 상각후대체원가를 적용하고 있어 내용연수 기간 동안 일정하게 감가상각되어 실질적인 가치를 평가하지 못하고 있다. 교량의 성능을 합리적으로 고려한 자산가치 평가를 위해 와이블 분포를 활용하여 교량의 평균수명, 신뢰도, 고장율 등 교량의 성능지표를 추정하였다. 추정된 성능지표와 결함도지수를 활용하여 새로운 자산가치 평가 방법을 제안하고 기존 방법과 비교·분석하였다. 제안한 가치평가 방법은 교량의 성능을 고려할 수 있어 기존 방법보다 객관적이고 현실성 있는 것으로 판단된다.

• 항공우주정책ㆍ법학회지
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• 제31권2호
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• pp.99-143
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• 2016

General aviation and air transport are two wings of the civil aviation industry. Chinese air transport is developing rapidly, and has become the world second air transport system only second to US since 2005. However, Chinese civil aviation is far behind the world average level, and cannot meet requirements of economic construction and social development. The transition and structural adjustment of Chinese economy provide the general aviation with a unprecedented broad market. The prospect of general aviation is promising and anticipated. The development of general aviation industry needs the legislative supports, and the current legislative conditions of Chinese general aviation are undoubtedly far behind the realistic requirements. Accelerating the legislation in Chinese general aviation industry requires scientific legislation concept. First, Legislation must promote development of general aviation industry. The general aviation will serves as a Chinese emerging industry that boosts domestic demand, promotes employment and expedite domestic economic development. We should, based on both the concept of promoting the industrial development of general aviation and national industrial planning, enact and rectify relative laws and regulations. And we should also straighten out the relationship between aviation security and industrial development and promote the revolution of low-altitude airspace management in an all-round way, in order to improve the utilization rate of airspace resources, classify and establish airspace, simplify examination and approval procedure and intensify operation management. In addition, what we should do is to expedite the infrastructure layout construction, guide the differentiated but coordinated development of general aviation industries in various areas, establish a united supervision mechanism of general aviation, redistrict the responsibilities of Chinese Air Control Agency and set up legislation, law enforcement and judicial systems with clarified institutions, clear positioning and classified responsibilities, so as to usher in a new era of the legislative management of Chinese general aviation industry. Second, shift the focus from regulations to both regulations and services. Considering the particularity of the general aviation, we should use American practices for reference and take into account both regulation and service functions when enacting general aviation laws. For example, we should reduce administrative licensing and market supervision, and adopt "criteria" and "approval" management systems for non-commercial and commercial aviation. Furthermore, pay attention to social benefits. Complete social rescuing mechanism through legislation. It should be clarified in legislation that general aviation operators should take the responsibilities of, and ensure to realize social benefits of environmental protection and ecological balance .Finally, rise in line with international standards. Modify Chinese regulations which is inconsistent with international ones to remove barriers to international cooperation. Specify basic legislative principles. One is the principle of coordination. Realize coordination between the civil aviation and general aviation, between military aviation and civil aviation, and among departments. Two is the principle of pertinence. The general aviation has its own rules and specialties, needing to be standardized using specialized laws and regulations. Three is the principle of efficiency. To realize time and space values of general aviation, we should complete rules in aerospace openness, general aviation airport construction, general aviation operations, and regulation enforcement. Four is the principle of security. Balance the maximum use of resources of Chinese airspace and the according potential threats to Chinese national interests and social security, and establish a complete insurance system which functions as security defense and indemnificatory measure. Establish a unified legal system. Currently, the system of Chinese general aviation laws consists of national legislation, administrative laws and regulations and civil aviation regulations (CAR). Some problems exist in three components of the system, including too general content, unclear guarantee measures, incomplete implementation details, and lacking corresponding pertinence and flexibility required by general aviation regulations, stringency of operation management and standards, and uniformity of standards. A law and regulation system, centered on laws and consisting of administrative laws regulations, industrial regulations, implementation details, industrial policies and local laws and regulations, should be established. It is suggested to modify the Civil Aviation Law to make general aviation laws complete, enact the Regulations of General Aviation Development, and accelerate the establishment, modification and abolition of Chinese general aviation laws to intensify the coordination and uniformity of regulations.