• Journal of Korea Technology Innovation Society
• /
• v.17 no.1
• /
• pp.174-194
• /
• 2014

Collaborative technology development is now one of the most significant modes of activity in the global scientific community. However, the international cooperation of science and technology simultaneously provides opportunities and challenges, and the results of global R&D collaboration can be positive or negative as the cooperation conditions of the parties may be different according to the types or characteristics of the participants and the pattern, purpose, and motivation of cooperation. In order to minimize the risk and improve the performance of cooperation, more comprehensive as well as micro-level research is needed. This study investigates a case of successful collaborative R&D conducted by several firms, universities, and public research organizations in both Korea and the U.S.A. The aim of this study is to identify the factors of successful R&D collaboration.

• KSII Transactions on Internet and Information Systems (TIIS)
• /
• v.10 no.10
• /
• pp.4661-4680
• /
• 2016

Cognitive radio (CR) technology is an effective solution to the spectrum scarcity issue. Collaborative spectrum sensing is known as a promising technique to improve the performance of spectrum sensing in cognitive radio networks (CRNs). However, collaborative spectrum sensing is vulnerable to spectrum data falsification (SSDF) attack, where malicious users (MUs) may send false sensing data to mislead other secondary users (SUs) to make an incorrect decision about primary user (PUs) activity, which is one of the key adversaries to the performance of CRNs. In this paper, we propose a coalition based malicious users detection (CMD) algorithm to detect the malicious user in CRNs. The proposed CMD algorithm can efficiently detect MUs base on the Geary'C theory and be modeled as a coalition formation game. Specifically, SSDF attack is one of the key issues to affect the resource allocation process. Focusing on the security issues, in this paper, we analyze the power allocation problem with MUs, and propose MUs detection based power allocation (MPA) algorithm. The MPA algorithm is divided into two steps: the MUs detection step and the optimal power allocation step. Firstly, in the MUs detection step, by the CMD algorithm we can obtain the MUs detection probability and the energy consumption of MUs detection. Secondly, in the optimal power allocation step, we use the Lagrange dual decomposition method to obtain the optimal transmission power of each SU and achieve the maximum utility of the whole CRN. Numerical simulation results show that the proposed CMD and MPA scheme can achieve a considerable performance improvement in MUs detection and power allocation.

• Journal of the Institute of Convergence Signal Processing
• /
• v.12 no.2
• /
• pp.113-118
• /
• 2011

In this paper, we develop a speaker gender classification technique using collaborative sensor fusion for use in a wireless sensor network. The distributed sensor nodes remove the unwanted input data using the BER(Band Energy Ration) based voice activity detection, process only the relevant data, and transmit the hard labeled decisions to the fusion center where a global decision fusion is carried out. This takes advantages of power consumption and network resource management. The Bayesian sensor fusion and the global weighting decision fusion methods are proposed to achieve the gender classification. As the number of the sensor nodes varies, the Bayesian sensor fusion yields the best classification accuracy using the optimal operating points of the ROC(Receiver Operating Characteristic) curves_ For the weights used in the global decision fusion, the BER and MCL(Mutual Confidence Level) are employed to effectively combined at the fusion center. The simulation results show that as the number of the sensor nodes increases, the classification accuracy was even more improved in the low SNR(Signal to Noise Ration) condition.

• Journal of the Korea Safety Management & Science
• /
• v.15 no.4
• /
• pp.261-267
• /
• 2013

In automobile company it is needed to establish the collaborative relationship between the assembly company and the part manufacturing company. In this paper we established the improvement for the procurement logistics and logistics in assembly company and thus we derived the near optimal procurement cycle through the simple EXCEL simulation and the improved inventory management method for H automobile company in CHINA. At this time we adopted the pull manufacturing process instead of push manufacturing process. We resulted that the manufacturing activity of both companies was stabilized and the usage of storage area in assembly company was reduced by 50%, especially it was reduced by 100% in the case of directly delivering the parts to assembly line through the third party logistics company.

• Journal of the Korean Home Economics Association
• /
• v.33 no.5
• /
• pp.129-142
• /
• 1995

The purpose of his research was to identify the time use of the middle aged apartment-residents in Seoul as a part of collaborative study of family life issues of them. The data were collected from 307 fulltime housewives with at least one child in a middle or high school. Data were analysed by means of the statistics of mean, frequency, Pearson's correlation, ANOVA and Multiple Regression, using a SPSS/PC+ program. The major findings of this research were as follows : Husbands and middle or high school children do much work or study, while housewives do housework about 6 hours a weekday. Much housewives don't manage their time use. Housewives have much leisure time and the in main Leisure activity is TV watching. Much of them don't satisfied with their leisure life. Satisfaction with time use of housewives are related to life satisfaction, and effected by time management and active leisure participation. Most of housewives don't satisfied with their time use.

• Journal of Gastric Cancer
• /
• v.12 no.1
• /
• pp.13-17
• /
• 2012

Laparoscopic gastrectomy was begun in 1995 in Korea. But, there was 4 years gap to reactivate in 1999. High incidence of gastric cancer and increasing proportion of early cancer through national screening program along with huge effort and enthusiasm of laparoscopic gastric surgeon, and active academic exchange with Japanese doctors contributed development of laparoscopic gastrectomy in Korea. Study group activity of Korean Laparoscopic Gastrointestinal Surgery Study (KLASS) group and Collaborative Action for Gastric Cancer (COACT) group were paramount to evoke large scale multicenter clinical study and various well performed clinical studies. This review encompasses mainly international publications about this area so far in Korea.

• School Mathematics
• /
• v.4 no.4
• /
• pp.657-675
• /
• 2002

This paper is to make strides toward an enriched understanding of the difficulties and issues raised by applying the 7th mathematics curriculum to elementary school classrooms. A general overview of the curriculum is presented in line with teaching and learning methods emphasized in the curriculum. Four classroom episodes are presented in brief in order to diagnose the problems in situating the curriculum in elementary mathematics classrooms. These episodes deal with lessons emphasizing activity rather than its associated concepts or principles, overusing multimedia data, pursuing play rather than its associated thinking, and distributing various individual worksheets in the name of differentiated instructional methods. In addition to the episodes, interview data with elementary school teachers also are presented as needed. This paper discusses two aspects of activating the curriculum into elementary mathematics classrooms. One deals with the issues of the curriculum and textbooks themselves, and the other covers those of research trends on mathematics education and teaching practices. This paper finally emphasizes a collaborative working relation among classroom teachers, mathematics educators, and policy makers with their own places and roles.

• Proceedings of the KSME Conference
• /
• 2004.04a
• /
• pp.887-892
• /
• 2004

In this paper, the activity of Japanese researchers relating multibody dynamics is introduced. The author stayed at the CCR(Center for Collaborative Research) in the university of Tokyo as a visiting scholar during December 10, 2003 to March 9, 2004. The information obtained from several universities (University of Tokyo, Sophia university, Nihon university, Tsukuba university), several industries and research institutes (JR Central in Nagoya, Toyota Research Center in Nagoya., Subway department in Tokyo, and JARI at Tsukuba), several research groups (JSCM, JSME, JSAE) was summarized with several photos. Professor Yoshihiro Suda's laboratory at the university of Tokyo, professor Yoshiaki Terumichi's laboratory at the Sophia university, and professor Ichiro Kageyama's laboratory at the Nihon university are introduced.

• Journal of Korean Society of Industrial and Systems Engineering
• /
• v.23 no.56
• /
• pp.19-34
• /
• 2000

Impact of business process re-engineering requires the fundamental rethinking of how information systems are analyzed and designed. It is no longer sufficient to establish a monolithic system for fixed business environments. Information systems must be adaptive in nature. This demand is also applied in production domain. Enabling concept for the adaptive information system is reusability. This paper presents a new object-oriented analysis process for creating such reusable software components in production domain, especially for production planning and scheduling. Our process called MeCOMA is based on three meta-models: physical object meta-model, data object meta-model, and activity object meta-model. After the three meta-models are extended independently for a given production system, they are collaboratively integrated on the basis of integration pattern. The main advantages of MeCOMA are (1) to reduce software development time and (2) to consistently build reusable production software components.

• Asian Pacific Journal of Cancer Prevention
• /
• v.17 no.10
• /
• pp.4681-4688
• /
• 2016

Objective: Our aim was to estimate whether diabetes mellitus (DM) may be associated with an increased risk of colorectal cancer (CRC) mortality in Japan. Methods: The Japan Collaborative Cohort (JACC) Study is a nationwide prospective study, initiated in 1988, which involves 110,585 subjects (age range: from 40 to 79 years; 46,395 males and 64,190 females). Our present analysis population comprised 96,081 (40,510 men and 55,571 women) who provided details on DM history. The questionnaire also included age, sex, weight, height, family history of CRC, smoking, drinking and exercise habits, and education. Cox proportional-hazard regression was used to estimate the hazard ratio (HR). We used SPSS 21 software to analyze all data. Results: Among the participants with DM, we followed up for 71,174 person-years and 640. deaths from CRC were confirmed; and, among the non-diabetic participants, 785 CRC deaths were identified during 1,499,324 person-years. After adjusting for multivariate confounding factors, such as age, sex, body mass index (BMI), family history of colorectal cancer, smoking habit, drinking habit, physical activity (sports and walking) and education, DM was associated with an increased risk of CRC death (HR 1.4, 95% confidence interval [CI] 1.0-2.0). Diabetic women, but not diabetic men, experienced increased mortality from CRC (HR 1.7, 95% CI 1.0-3.0). Conclusion: The risk of CRC mortality is significantly increased in both sexes and women with diabetes, but no significant increase was seen for diabetic men among Japanese.