• 한국정보통신학회:학술대회논문집
• /
• 한국정보통신학회 2021년도 춘계학술대회
• /
• pp.423-424
• /
• 2021

이 논문에서는 수면 환경을 감지하는 센서들로부터 데이터를 수집하고 이를 바탕으로 수면 환경을 최적으로 조절하여 숙면을 취할 수 있도록 도와주는 시스템을 제안한다. 수면 환경 분석은 로드셀을 통한 뒤척임 감지에 의한 수면 단계 판단을 기본으로 하고 온도, 습도, 조도 등의 데이터를 바탕으로 온열 장치, 가습기, 블라인드 등을 제어하여 숙면을 취할 수 있는 환경을 조성한다. 수면 상태에 따른 수면 환경 제어는 기상하기 쉬운 수면 상태를 유도함으로써 기상 시에 피로감을 줄일 수 있다.

• 식물병연구
• /
• 제11권2호
• /
• pp.185-192
• /
• 2005

전국의 고추 재배지에서 1999년과 2002년에 채집한 병든 고추로부터 각각 130개와 258개의 고추 탄저병균을 분리한 후, 4종의 보호용 살균제와 3종의 ergosterol생합성 저해 살균제에 대한 균사 생장 저해 정도를 측정함으로서 살균제들에 대한 저항성 모니터링을 실시하였다. 1999년에 분리한 균주는 세 가지 보호용 살균제, 즉 dithianon, chlorothalonil 및 propineb에 대해서는 2002년의 균주보다 더 저항성을 보였다. 이에 반하여 다른 보호용 살균제인 iminoctadine에 대해서는 오히려 2002년의 균주가 더 저항성인 것으로 나타났다. 세 개의 ergosterol 생합성 저해(EBI) 살균제, 즉 tebuconazole, hexaconazole 및 prochloraz에 대해서는 2002년의 균주가 1999년의 균주보다 더 저항성이 컸으며, 2002년도의 균주들의 $EC_{50}$ 값은 1999년 균주들보다 1.2배 내지 4.4배가 높았다 위의 살균제들에 대한 탄저병균의 반응을 보면, 채집한 지역 간에 저항성을 차이가 크게 나타나고 있었다. 단기간내에 충북에서 분리한 균주들은 채집한 시기가 늦어질수록, 고추의 생육 초기에 주로 많이 사용되는 보호용 살균제들에 대한 $EC_{50}$값은 감소하였다. 그러나 ergosterol 생합성 저해 살균제에 대한 균주들의 반응은 정해진 생육 기간 중에는 변화가 거의 없었다.

• 산업기술연구
• /
• 제20권A호
• /
• pp.257-267
• /
• 2000

It was difficult to apply conventional excavation methods in some sections from Seoul to Pusan high speed rail road construction of 1 lot 2, due to highway concrete road, gas pipe, water pipe and nearby factories with automatic control system machine. To excavate safely and efficiently in these sections new blast patterns were employed within allowable blast vibration level, by test blast and controlled vibration by sequential blast. Behaviors of the rock mass including convergence and displacement around tunnel were measured with construction works and the crack width in concrete wall was also monitored for controlling allowable limits. The results can be summarized as follow : 1. The allowable blast vibration level in structure site is less 1.0cm/sec for highway concrete, 0.5 cm/sec for gas pipe, water pipe and building housing and 0.3 cm/sec for automatic control system machine. 2. The convergence displacement, single rod extensometer and multi rod extensometer around tunnel and cracks in concrete wall were measured, it was confirmed that the measured values were converged within allowable level. 3. The empirical formular of ground vibrations with 90% confidence lines for PD-3 was given as follow. $$V_{90%}=45.549({\frac{D}{\sqrt{W}}})^{-1.353}$$

• 한국해양공학회:학술대회논문집
• /
• 한국해양공학회 2002년도 춘계학술대회 논문집
• /
• pp.209-214
• /
• 2002

We developed a small, remote controlled observation ship that can reduce the cost of gathering data for marine and coastal environments. The control system is composed of three microprocessors, one is for overall mission control, another for control of propulsion motors, and the other for sensor operation. For communication system, we adopt direct and indirect methods based on the wireless modem of commercial cellular telephone. The former is a direct communication between the modems of the ship and the server, and the latter is an indirect communication via internet between the ship and the server. The performance of the ship is demonstrated with the results produced by sets of experiments.

• Journal of Electrical Engineering and Technology
• /
• 제6권2호
• /
• pp.215-225
• /
• 2011

In this paper, a buck DC-DC bridge converter is used as a power factor correction (PFC) converter for feeding a voltage source inverter (VSI) based permanent magnet brushless DC motor (PMBLDCM) drive. The front end of the PFC converter is a diode bridge rectifier (DBR) fed from single phase AC mains. The PMBLDCM is used to drive the compressor of an air conditioner through a three-phase voltage source inverter (VSI) fed from a variable voltage DC link. The speed of the air conditioner is controlled to conserve energy using a new concept of voltage control at a DC link proportional to the desired speed of the PMBLDC motor. Therefore, VSI operates only as an electronic commutator of the PMBLDCM. The current of the PMBLDCM is controlled by setting the reference voltage at the DC link as a ramp. The proposed PMBLDCM drive with voltage control-based PFC converter was designed and modeled. The performance is simulated in Matlab-Simulink environment for an air conditioner compressor load driven through a 3.75 kW, 1500 rpm PMBLDC motor. To validate the effectiveness of the proposed speed control scheme, the evaluation results demonstrate improved efficiency of the complete drive with the PFC feature in a wide range of speed and input AC voltage.

• Journal of Electrical Engineering and Technology
• /
• 제10권3호
• /
• pp.755-765
• /
• 2015

A thermostatically controlled load (TCL) can be one of the most appropriate resources for demand response (DR) in a smart grid environment. DR capability can be effectively implemented in a TCL with various intelligent control methods. However, because traditional on-off control is still a commonly used method in a TCL, it is useful to develop a method for adding DR capability to the TCL with an existing on-off controller. As a specific realization of supervisory control for implementing DR capability in the TCL, two methods are proposed - a method involving the changing of a set point and a method involving the paralleling of an identified system without delay. The proposed methods are analyzed through the simulations with an electric heater for different power consumption levels in the on-state. Considerable cost benefit can be achieved with the proposed methods when compared with the case without DR. In addition, the observations suggest that a medium power consumption level, instead of the maximum power, in the on-state should be used for consistently obtaining the cost benefit without severe temperature deviation from the specified temperature range for DR.

• 한국문헌정보학회지
• /
• 제45권1호
• /
• pp.211-232
• /
• 2011

대표적인 통제어휘인 시소러스는 지난 50년간 정보의 색인과 검색을 위한 도구로 널리 활용되어 왔다. 이러한 흐름에 발 맞추어 다양한 주제분야에서의 시소러스 개발을 위한 지침을 제공하기 위해 국제표준 및 국가표준이 개발되었으며, 최근 들어 시소러스 관련 표준의 개정작업이 활발히 이루어지고 있다. 이러한 시소러스 관련 표준으로 ISO 25964와 BS 8723이 대표적인 사례이다. 본고에서는 이러한 표준의 개정 현황을 살펴보고 변화된 내용과 그 시사점을 도출하여 보았다. 이러한 고찰 결과를 기반으로 오늘날의 새로운 정보환경 아래에서 시소러스가 제공할 수 있는 새로운 기능과 그 기능을 수행하기 위해 필요한 요소들을 제시하였다.

• 간호행정학회지
• /
• 제18권4호
• /
• pp.414-423
• /
• 2012

Purpose: The purpose of this study was to investigate the impact of the unit-level nurse practice environment on nurse turnover intention in the small and medium sized hospitals. Methods: A cross-sectional study was conducted using a questionnaire survey with 308 nurses in 38 nursing units of 6 small and medium sized hospitals, having over 200 beds and under 300 beds and located in B metropolitan city. Data were collected from July 20 to August 10, 2011. Data were analyzed using hierarchical multiple regression. Results: The mean turnover intention in nurses of small and medium sized hospitals was $3.52{\pm}0.53$. Factors affecting turnover intention in the nurses included age, work unit, monthly income, number of night-duties, work hours per day and unit-level nurse practice environment. The unit-level nurse practice environment accounted for 15% of turnover intention when other variables were controlled. Conclusion: The results of the study indicate that nurse turnover intention is associated with the nurse practice environment at the unit level. Small and medium sized hospitals can improve nurse retention and lower turnover intention by changing the nurse practice environment of unit, such as creating better support services and nurse participation in hospital affairs.

• 대한전자공학회:학술대회논문집
• /
• 대한전자공학회 2003년도 하계종합학술대회 논문집 Ⅲ
• /
• pp.1243-1246
• /
• 2003

It is known that structure of Human's brain information system is controlled by cerebral cortex mainly. Cerebral cortex is divided by sensory area, motor area and associated area largely. Sensory area takes part in information from environment and motor area is actuation by decision as associated area determined. It is possible to copy brain information system by input-output pattern. but there is difficulty in modeling of memorizing new information. Such action is performed by Limbic Lobe and Papez circuit which is controlled by intrinsic emotion. So we need of definition of emotion's role in decision. In this paper, we define roles of emotion in intrinsic decision using Dynamic Cognitive Maps(DCMs). The emotion is evaluated by outside information then intrinsic decision performed as how much emotion variated. The dynamic cognitive maps take part in emotion evaluating process.

• 설비공학논문집
• /
• 제15권6호
• /
• pp.543-550
• /
• 2003

In order to saving the energy for HVAC system of buildings, utilization of wind-induced cross ventilation is thought to be promising. However, utilization of natural ventilation alone is not sufficient for maintaining the human thermal-comfort such as in hot and humid regions. A hybrid air conditioning system with a controlled natural ventilation system, or combination of natural ventilation with mechanical air conditioning is thought to overcome the deficiency of wind-driven cross ventilation and to have significant effects on energy reduction. This paper describes a concept of hybrid system and propose a new type of hybrid system using radiational cooling with wind-induced cross ventilation. Moreover, a radiational cooling system is compared with an all-air cooling system. The characteristics of the indoor environment will be examined through CFD (Computational Fluid Dynamics) simulation, which is coupled with a radiation heat transfer simulation and with HVAC control in which the PMV value for the human model in the center of the room is controlled to attain the target value.