• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.8 no.1
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• pp.1-11
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• 2015

In this study we investigate how motive and personal relations of volunteers impact their volunteering satisfaction. The objects were 313 members of a volunteer group in ${\bigcirc}$-gun, central region. We conducted survey from 2014 April 2 to August 31. The data were analyzed by correlation analysis, t-test, multiple regression analysis, through SPSSWIN 18.0 program,(empirical analysis verification : significance level of 5%). The results are as follows: First, with the general characteristics, we found that females, the educated, and the married get more satisfaction. Second, with the local characteristics, long-term residents and the members, who think volunteer activity contribute to the local development, feel more satisfaction. Third, volunteer who has high participation motives, has strong volunteering satisfaction. Finally, volunteers feel more satisfaction when they maintain a good relationships in interpersonal relationship. This study implicates that volunteer activity participation motives and personal relations have a great impact on volunteering satisfaction, to be the basis for volunteer's satisfaction improving policy in the future.

• The Journal of the Korea Contents Association
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• v.11 no.11
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• pp.156-172
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• 2011

The purpose of this paper is to highlight the importance of conflict management by local government by explaining a peculiar case of Namyangju city's construction project of landfill site for incineration remnants. Policy stage and internal dynamics of conflict between city and opposition group of local residents are used as major tools of case observation. From this analysis, this study finds that the conflict management effort of local government is critical to bring a success of a public policy. The local government needs to assess possible sources of conflict, and to prepare reasonable solutions through sincere communication with local residents. Also we need to reconsider the concept of administrative efficiency. Sometimes "slow" is better than "fast". Authoritative and hasty policy process may face unexpected obstacles, then consume more time to fulfill the policy goals. It means that the local government needs to spend more time for policy formulation. It also shows the importance of democratic process in reaching a public policy decision. In conclusion, this study confirms that the cooperative relationship between local government and residents, so-called governance, is the key to the success of public policy.

• International Journal of Internet, Broadcasting and Communication
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• v.12 no.2
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• pp.83-89
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• 2020

A microstrip feedline based open ended folded-slot antenna is proposed for ultra-wideband (UWB) applications. The prototype of the proposed antenna is fabricated on the FR4 dielectric substrate. The proposed antenna has a wide n-shaped slot that is useful for designing circuit components on the same printed circuit board (PCB) as that of the radio frequency (RF) modules. The proposed antenna use two kinds of slots as radiators, and each slots have different characteristics because of the different type of ends of the slot. The wideband characteristic can be obtained by resonances of each slot which are occurred at different frequencies. The measured impedance bandwidth (S₁₁≤ -10 dB) is 2.9-11.56 GHz, and the antenna peak gain is 2-4 dBi over the UWB range. The antenna has a stable omni-directional radiation pattern and only a small group-delay variation across the UWB passband. In addition, we present a modified design with band-notched characteristics of a 5 GHz wireless local area network (WLAN) frequency band.

• Journal of the Korea Society of Computer and Information
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• v.18 no.2
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• pp.117-126
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• 2013

Path planning is an essential problem to make virtual characters navigate in many applications including computer games. In many cases, multiple characters move in a group and qualitative aspects of planned paths are emphasized rather than optimality unlike Robotics. In this paper, we propose a two-level path planning algorithm in which the global path is planned for a single character specified as a leader and then the local path is planned to avoid dynamic obstacles while the group following this path. The space for group movement is achieved in the form of square grid array called a grid window. Member characters are located relatively to the leader within a space and moved. The static environment is reduced to the configuration space of this grid window to generate a roadmap on which a grid window can move. In local path planning, only the leader avoids dynamic obstacles by using an artificial potential field and the rest of members are located relatively to the leader in the grid window, which reduces computational load. Efficient algorithms to implement the proposed planning methods are introduced. The simulation results show that a group can handle with dynamic obstacles effectively while moving along the planned path for a static environment.

• The Transactions of the Korea Information Processing Society
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• v.5 no.4
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• pp.1033-1043
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• 1998

In this paper, we present an improved multicasting path assignment algorithm based on the minimum cost spanning tree. In the method presented in this paper, a multicasting path is assigned preferentially when a node to be received is found among the next degree nodes of the searching node in the multicasting path assignment of the constrained steiner tree (CST). If nodes of the legacy group exist between nodes of the new group, a new path among the nodes of new group is assigned as long as the nodes may be excluded from the new multicasting path assignment taking into consideration characteristics of nodes in the legacy group. In assigning the multicasting path additionally, where the source and destination nodes which can be set for the new multicasting path exist in the domain of identical network (local area network) and conditions for degree constraint are satisfied, a method of producing and assigning a new multicasting path is used. The results of comparison of CST with MCSTOP, MCSTOp algorithm enhanced performance capabilities about the communication cost, the propagation delay, and the computation time for the multicasting assignment paths more than CST algorithm. Further to this, research activities need study for the application of the international standard protocol(multicasting path assignment technology in the multipoint communication service (MCS) of the ITU-T T.120).

• Proceedings of the Korean Vacuum Society Conference
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• 2012.08a
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• pp.117-117
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• 2012

Si:Ge alloy semiconductor nanocrystals (NCs) offer challenging opportunities for integrated optoelectronics/optoplasmonics, since they potentially allow unprecedentedly strong light-matter interaction in the wavelength range of the optical communication. In this talk, we discuss the recent research efforts of my laboratory to develop optoelectronic components based on individual group IV NCs. We present experimental demonstration of the individual NC optoelectronic devices, including broadband Si:Ge nanowire (NW) photodetectors, intra NW p-n diodes, Ge NC electrooptical modulators and near-field plasmonic NW detectors, where the unique size effects at the nanometer scales commonly manifest themselves. In particular, we demonstrated a scanning photocurrent imaging technique to investigate dynamics of photocarriers in individual Si:Ge NWs, which provides spatially and spectrally resolved local information without ensemble average. Our observations represent inherent size-effects of internal gain in semiconductor NCs, thereby provide a new insight into nano optoplasmonics.

• Journal of Korean Institute of Industrial Engineers
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• v.5 no.2
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• pp.57-69
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• 1979

This review focuses on the individual performance and productivity of researchers in the area of science and technology. The researchers in the paper are classified into individual inventors without organizational affiliation and researchers in the organization, which are distinguished by cosmopolitanic professionals and local institutionalists. The productivity of researchers is in general measured by different indicators or measurement scales such as: i) subjective evaluation of overall research performance, (ii) the number of published papers, reports and books, iii) the quality of research output (e.g. citation frequency), iv) originality of research ouput (e,g, patents), v) multiple measurement scales, etc. According to the literature based on empirical study, the productivity of individual reseachers is positively related to the degree of freedom, communication, diversity, dedication, and motivation and negatively related to the degree of similarity, and satisfaction. However, other factors such as creativity, age, supervisory behavior and group characteristics have shown irregular direction of correlation.

• Journal of Korea Society of Digital Industry and Information Management
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• v.16 no.2
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• pp.27-33
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• 2020

Backward compatibility is one of the key issues for radio equipment supporting IEEE 802.11, the typical wireless local area networks (WLANs) communication protocol. For a successful packet decoding with the backward compatibility, the frame format detection is a core precondition. This paper presents a novel frame format detection method based on a deep learning procedure for WLANs affiliated with IEEE 802.11. Considering that the detection performance of conventional methods is degraded mainly due to the poor performances in the symbol synchronization and/or channel estimation in low signal-to-noise-ratio environments, we propose a novel detection method based on convolutional neural network (CNN) that replaces the entire conventional detection procedures. The proposed deep learning network provides a robust detection directly from the receive data. Through extensive computer simulations performed in the multipath fading channel environments (modeled by Project IEEE 802.11 Task Group ac), the proposed method exhibits superb improvement in the frame format detection compared to the conventional method.

• Journal of information and communication convergence engineering
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• v.6 no.2
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• pp.228-232
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• 2008

In recent years, wireless ad hoc networks have become increasingly popular in both military and civilian applications due to their capability of building networks without the need for a pre-existing infrastructure. Recently, IEEE 802.11 Task Group e has been working on a new mechanism, the Enhanced Distributed Coordination Function (EDCF), to enhance the performance of 802.11 DCF. However, EDCF only reduces the internal collisions within a station, and external collisions between stations remain high in ad-hoc networks. In this paper, we propose to adopt an adaptive backoff window control technique, based on a dynamic value of the initial value of the range in which the backoff is chosen, so the backoff timer is randomly chosen in the range (InitRng, CW-1). We use ns-2 simulation to evaluate the throughput of our scheme. Results show that the throughput is improved for our scheme compared to the original DCF due to the reduced the number of collisions.

• Proceedings of the Korean Institute of Interior Design Conference
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• 2007.11a
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• pp.179-182
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• 2007

2007 Design Festival on Seongnam Living Design has been held with the theme of "You and I, We" on the basis of harmony through design. This kind of theme has the main concepts as follows: Harmony- the exhibition program that can capture our mind, Communication-the experience program not through personal work but through group work, Design Seongnam-joyful Sungnam which we have made together by regional participation design project. Especially, it also has encouraged active and voluntary participation based on the promotion of the event and design exhibition that are hosted by the universities, elementary and secondary schools that represent the downtown Seongnam. In understanding Seongnam City, it has applied the plan introducing emotional process. These are the programs, which are reading, thinking, listening, watching, touching, making, and dreaming. Through the processes of being with Seongnam by participants, it has helped people know more about Seongnam, and focused on being the exhibition understanding the members of the community Seongnam.