• 산업경영시스템학회지
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• 제29권4호
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• pp.65-74
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• 2006

This research tried to grasp present condition of domestic corporation's society contribution activity and grope desirable direction of society contribution activity hereafter. As analysis result, establishment of the responsible department or human power in charge for society contribution activity is insufficient, and depend on contribution activity of simple donation than to administer program directly, result of contribution activity is not linked with corporation's purpose or result and practical use of network with similar organization for society contribution was proved by low. Desirable direction of domestic corporation society contribution activity is as following hereafter based on analysis result. First, corporation must put in good order inside system with an establishment of the responsible department for society contribution, security of human power in charge and introducing education program for training specialist. Second, corporation must select specific field with capacity that corporation is holding and improve result of society contribution activity as concentrated investment. Third, corporation must construct network with various similar groups and organizations including NPO/NGO and heighten consummativeness of society contribution activity through mutual interchange and cooperation.

• 한국실내디자인학회논문집
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• 제25권1호
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• pp.65-72
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• 2016

In allowing visitors to manipulate objects or models with their hands, science museums can become informal education institutions. However, little research has been conducted analyzing the specific interactions of visitors at museums and the effects that specific characteristics of interactive exhibit have on visitors. This research classified exhibits according to the three characteristics: the presentation of concepts, interaction with exhibits and concept levels. Further, relationships among engagement behaviors, visitors'attraction to exhibits, and the holding power of exhibits were analyzed. Using the three characteristics, 55 exhibits were classified into five styles. The results suggest that intriguing content and novel interfaces, maximizing information on science and technology, should be developed for the educational purpose of encouraging visitors to engage in active learning with interactive exhibits. The results of this study provide useful data that planners, designers, and instructors of science museums can use to maximize visitors' participatory learning and interactions.

• 전력전자학회:학술대회논문집
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• 전력전자학회 1997년도 전력전자학술대회 논문집
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• pp.200-203
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• 1997

This paper describes an study electric injection system for diesel engines. It is needed effective fuel injection which controls the solenoid valve of fuel pump. To solve this, this paper proposes DCC-PWM method which can realize fast reply and low holding current for solenoid valve on/off. For the proposed design method, simulation tools of ACSL are used to analyze the system. And the single-chip microcomputer is used to reduce the size of controller and to improve flexibility. And the system's validity can be verified through the experimental results.

• 한국가구학회지
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• 제25권4호
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• pp.277-287
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• 2014

Current Korea furniture market is holding and leading with Hanssem, Livart, and other 10 main furnitures companies. The Hanssem furniture company is the first sales in Korea. And whole sales revenue was over 1 trillion KRW. Recently in Korea furniture market is changing rapidly by announcement of IKEA of expansion to Korea. IKEA is the number one furniture company in north european countries. Also, this company spreads at world widely, 44 countries and 358 shops, with their own marketing plans between lowest prices and developing north european furniture styles. Korean furniture companies are get in dangerous condition, and especially serious problems near Korean furniture company using same market place with IKEA. This research is expecting IKEA's brand power will hitting Korea furniture industries. Therefore, Korea furniture companies and industries need analysis of IKEA furniture, marketing strategy of IKEA, production strategy and other plans must be prepare for expansion of IKEA in Korea.

• Journal of Biosystems Engineering
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• 제23권1호
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• pp.67-74
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• 1998

A nondestructive quality inspection technique using acoustic impulse response method was developed for eggshell inspection. An experimental system was built to generate the impact force, to measure the response signal and to analyze the frequency spectrum. This system includes an impulse generating unit, an egg holding seal a microphone with preamplifier, and a DSP board installed on Personal Computer. A simple algorithm .was developed for crack detection. Using the developed system with algorithm, crack detection ability was evaluated and the error rate to estimate the normal egg as cracked was found to be 4% and the error rate to estimate the cracked egg as normal was also found to be 4%. This system could be adopted in industry with some modification.

• 제어로봇시스템학회논문지
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• 제6권2호
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• pp.146-154
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• 2000

An $H\infty$ controller is designed for active suspensions of vehicles using 7-degree-of-freedom full-car model. Its performance robustness as well as stability robustness to system parameter variations and unmodelled dynamics are assured through the $\mu$-framework. The performance of the $H\infty$ controller is compared with that of a LQC controller in compute simulations. From the simulations it is found that the active suspension with the $H\infty$ controller reduces the acceleration and motion of the sprung mass in the heaving rolling and pitching directions when the car is driven on a normal road or through an asymmetric bump. The suspension stroke and the road holding capability are also improved with a relatively small level of power consumption. Overall the $H\infty$ controller shows a more robust performance than that of the LQG design.

• 한국정보과학회:학술대회논문집
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• 한국정보과학회 2002년도 봄 학술발표논문집 Vol.29 No.1 (B)
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• pp.556-558
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• 2002

본 논문에서는 멀티미디어 게임의 흡인요소를 분석하였다. 인지 및 감성을 고려한 흡인요소에는 22가지가 있었다. 이 흡인요소들을 몰입차원과 구현방식 그리고 자극방법 등의 각도에서 그 상관관계를 파악하였다. 그 결과 게임의 흡인요소 22가지 중에서 새로운 게임을 설계할 때 일체감. 자극성, 도박, 현장감, 환상감, 만족감, 성취감 등의 7가지 요소를 우선적으로 고려해야 함을 확인하였다.

• 한국전기전자재료학회논문지
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• 제27권11호
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• pp.686-689
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• 2014

Electrostatic discharge has been considered as a major reliability problem in the semiconductor industry. ESD reliability is an important issue for these products. Therefore, each I/O (Input/Output) PAD must be designed with a protection circuitry that creates a low impedance discharge path for ESD current. This paper presents a novel Lateral Insulated Gate Bipolar (LIGBT)-based ESD protection circuit with latch-up immunity and high robustness. The proposed circuit is fabricated by using 0.18 um BCD (bipolar-CMOS-DMOS) process. Also, TLP (transmission line pulse) I-V characteristic of proposed circuit is measured. In the result, the proposed ESD protection circuit has latch-up immunity and high robustness. These characteristics permit the proposed circuit to apply to power clamp circuit. Consequently, the proposed LIGBT-based ESD protection circuit with a latch-up immune characteristic can be applied to analog integrated circuits.

• 한국농업기계학회:학술대회논문집
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• 한국농업기계학회 1993년도 Proceedings of International Conference for Agricultural Machinery and Process Engineering
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• pp.648-655
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• 1993

The hydraulic coconut dehusking machine consists of three main parts ie. The frame , the power unit including the hydraulic accessories, the lifting and dehusking mechanisms. Two sets of the hydraulic coconut dehusking machine were developed . their hydraulic and electrical control circuits were connected in series to enable them operating contemporaneously. Two operators are required to operate the machine. Each of them put a coconut on the lifting mechanism in order to start the working cycle automatically. As a result, the nut are immediately pushed up and seized by the holding teeth under the supplement of the hydraulic reducing circuit. After that the dehusking mechanism started operating via the sequence circuit. At the end of the cycle, both mechanisms return to their original positions. Some remaining fibrous is taken out manually from the nut subsequently . The continuous dehusking speed was found to be 22.2 seconds per 2 coconuts.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1044-1048
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• 2001

This paper proposes a nonlinear impedance circuit composed by diodes and inductors or capacitors. This circuit needs no control circuits and switches, and the impedance value is changed by the polarity of current or voltage. This paper presents one of these applications to improve the input current of capacitor input diode rectifiers. The rectifier using the nonlinear impedance circuit id constructed with four diodes and four capacitors in addition to the conventional rectifiers, that is, it has eight diodes and five capacitors, including a DC link capacitor. It makes harmonic components of the input current reduce and the power factor improve. A circuit design method is shown by experimentation and confirmed simulation. It explained that compared conventional pulse-width modulated (PWM)inverter with half pulse-width modulated (HPWM) inverter proposed HPWM inverter eliminated dead-time by lowering switching loss and holding over-shooting.