• 제어로봇시스템학회:학술대회논문집
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• 1995.10a
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• pp.183-186
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• 1995

A method is presented for optimization of Universal Learning Networks (ULN), where, together with gradient method, Simulated Annealing (SA) is employed to elude local minima. The effectiveness of the method is shown by its application to control of a crane system.

• Journal of Institute of Control, Robotics and Systems
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• v.4 no.6
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• pp.780-785
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• 1998

In this paper, it is shown that the conventional methods for dealing with the singularity problem of a manipulator can be generalized as a local minimization problem with differently weighted objective functions. A new damping method proposed in this article automatically determines the damping amounts for singular values, which are inversely proportional to the magnitude of the singular values. Furthermore, this can be done without explicitly computing the singular values. The proposed method can be applied to all the manipulators with revolute joints.

• 제어로봇시스템학회:학술대회논문집
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• 1990.10a
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• pp.36-40
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• 1990

Conventional back propagation learning is generally characterized by slow and rather inaccurate learning which makes it difficult to use in control applications. A new multilayer perception architecture and its learning algorithm is proposed that consists of a Kohonen front layer followed by a back propagation network. The Kohonen layer selects a subset of the hidden layer neurons for local tuning. This architecture has been tested on the inverse kinematic solution of robot manipulator while demonstrating its fast and accurate learning capabilities.

• Journal of Electrical Engineering and information Science
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• v.2 no.5
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• pp.45-50
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• 1997

This paper present an advanced fault diagnosis expert system to assist the operators at local control center. The system utilizes all th information available in a local control center for the better diagnostic performance. The major feature of the system is dealing with multiple faults diagnosis based on the certainty factor method for the reasoning process. the overall performance and the generality are also enhanced by utilizing the general topological knowledge. ASCADA simulator is also developed for he test and demonstration.

• 제어로봇시스템학회:학술대회논문집
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• 2004.08a
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• pp.1386-1391
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• 2004

It is known that an aircraft with delta-wings which are attached to the body at a large angle like a kite or a hang glider has a measure of maneuverability and stability. Aircrafts of this kind can fly stably. Even if engine trouble occurs, it will not fall and might be able to land. In this paper, one of the conventional control methods, PID control, is applied to the aircraft with LQ local control block. This is based on an idea that the aircraft flies so stably that the automatic control system might be realized by a simple controller. The proposed PID controller consists of several sub-controllers which are constructed to each system neglecting the interference. In addition, the LQ control is involved as a local loop of the aileron and rudder control in order to increase stability of the attitude when circling. The effectiveness of the proposed method is shown through 3D computer simulations and experiments of the flight path control.

• Korean Journal of Air-Conditioning and Refrigeration Engineering
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• v.13 no.10
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• pp.947-959
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• 2001

We propose a control scheme to control the indoor zone temperature via variable air volume (VAV) unit. To control the room temperature, state space model of the conditioned zone which is partitioned into nine artificial sectional regions is derived. The nonlinearity of the damper motion and actuator are considered for the practical use in the state space system description. The temperature control of the room temperature is performed by manipulating the degree of openness of the damper in relation to the local room temperature and the supplied air flow rate. In general, since a local temperature in the conditioned zone is measured, it is required to estimate the temperature values in each regions for the precise temperature control. We thus design a state observer to estimate the regional temperature, and use these values in the controller. The overall control system consists of the state observer based state feedback with the integral control. We compared the control results of the proposed scheme with those of cascade proportional and integral (PI) control, and showed that the scheme achieved precise control of the conditioned system.

• Journal of Korea Trade
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• v.25 no.1
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• pp.184-202
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• 2021

Purpose - This study empirically investigates the relationship between expatriate CEOs of multinational corporation (MNC) foreign subsidiaries and local philanthropy. Since corporate social responsibility (CSR) enables MNCs to achieve local legitimacy, this research argues that local philanthropy is a valuable strategic means for expatriate CEOs of foreign subsidiaries to secure local legitimacy. Design/methodology - To investigate our argument, we use a sample of 5,459 observations from 576 foreign subsidiaries of MNCs in Korea between 2002 and 2016. We conduct a random-effects panel Tobit regression with subsidiary CEO having foreign nationality as the independent variable and local philanthropy as the dependent variable. Findings - Our main findings are that expatriate CEOs of foreign subsidiaries are more actively engaged in local philanthropy. In addition, the positive relationship between expatriate CEOs and local philanthropy is weaker as their tenure increases. Originality/value - How expatriate CEOs overcome their weak local legitimacy as foreigners in a host country has remained unclear because existing studies mainly focused on the control and coordination aspects of staffing expatriates in CEO positions of foreign subsidiaries. This study broadens the literature on subsidiary CEO staffing and CSR activities of MNCs by identifying complementary relationships between expatriate CEOs and corporate philanthropy in the host country.

• Journal of Korean Academy of Rural Health Nursing
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• v.5 no.1
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• pp.5-15
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• 2010

Purpose: This study was conducted to examine the effects of a self-control promotion program on self-efficacy, self-care and physiological indicators of patients with diabetes who live in local communities. Method: This research was designed using a nonequivalent control group pre, posttest study. Data were collected from December, 2008 through March, 2009. The participants of the study consisted of 93 patients with diabetes who live in a local community. A self-control promotion program was provided for the experimental group for 12 weeks. Data were collected through self-report questionnaires and direct measurements, and analyzed using descriptive statistics, $X^2$-test, and repeated measures ANOVA. Results: There were significant differences in self-efficacy and self-care between the experimental and control groups. However, there were no significant differences in physiological indicators such as fasting blood sugar, HbA1C, BMI, and BP between the two groups. Conclusion: The results indicate that the self-control promotion program was effective in promoting self-efficacy and self-care, which are crucial factors in controlling diabetes mellitus. However, a longitudinal study needs to be done to confirm the effects of self-control promotion programs on long-term glucose control.

• Proceedings of the KIEE Conference
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• 2003.11c
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• pp.769-772
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• 2003

Middleware enables different networking devices and protocols to inter-operate in ubiquitous home network environments. The UPnP(Universal Plug and Play) middleware, which runs on a PC and is based on the IPv4 protocol, has attracted much interest in the field of home network research since it has versatility. The UPnP, however, cannot be easily accessed via the public Internet since the UPnP devices that provide services and the Control Points that control the devices are configured with non-routable local private or Auto IP networks. The critical question is how to access UPnP network via the public Internet. The purpose of this study is to deal with the non-routability problem in local private and Auto IP networks by improving the conventional Control Point used in UPnP middleware-based home networks. For this purpose, this paper proposes an improved Control Point for accessing and controlling the home network from remote sites via the public Internet, by adding a web server to the conventional Control Point. The improved Control Point is implemented in an embedded GNU/Linux system running on an ARM9 platform.

• Asia-Pacific Journal of Business Venturing and Entrepreneurship
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• v.8 no.1
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• pp.205-222
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• 2013

As Social Welfare Service Act was revised in 2011 and its enforcement decree was revised in 2012, the function of local social welfare center was classified into 3 functions such as case control function, service supply function and local society systematization function. Therefore, from 2013, local social welfare center faces the assignment to establish its status as a core subjectivity of local social welfare while maintaining function, role, business, program, service and organization system required for local social welfare center. Currently, there are internal and external limit factors for local social welfare center to perform its original function. The external limit factors are competition with similar organization, diversification of welfare desire depending on social change, insufficient service network construction and lack of partnership between private sector and government. The internal limit factors are lack of local social organization's ability, program issue, insufficient resource, insufficient manpower, etc. In order for local social welfare center to overcome the limit factor and establish the core status for improving the life quality of resident, it should concentrate its ability on local society systematization, construct human & material support network related to local social welfare, minimize social education program and simple relief project gradually, suggest the reasonable direction for village to nurture resident organization, develop the program based on the research on local resident's desire and create the partnership between private sector and government.