• The Journal of the Acoustical Society of Korea
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• v.24 no.4E
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• pp.128-131
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• 2005

A new algorithm for speech signal segmentation is proposed. This algorithm is based on finding successive similar frames belonging to a segment and represents it by an average spectrum. The speech signal is a slowly time varying signal in the sense that, when examined over a sufficiently short period of time (between 10 and 100 ms), its characteristics are fairly stationary. Generally this approach is based on finding these fairly stationary periods. Advantages of the. algorithm are accurate border decision of segments and simple computation. The automatic segmentations using frame averaging show as much as $82.20\%$ coincided with manually verified segmentation of CMU ARCTIC corpus within time range 16 ms. More than $90\%$ segment boundaries are coincided within a range of 32 ms. Also it can be combined with many types of automatic segmentations (HMM based, acoustic cues or feature based etc.).

• Journal of Electrical Engineering and Technology
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• v.10 no.1
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• pp.146-154
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• 2015

This paper proposes a control method for maintaining the energy level for a supercapacitor energy storage system coupled with a wind generator to stabilize wind power output. Although wind power is green and clean energy source, disadvantage of the renewable energy output power is fluctuation. In order to mitigate the fluctuating output power, supercapacitor energy storage system (SCESS) and wind power simulator is developed. A remaining energy supercapacitor (RESC) control is introduced and analyzed to smooth for short-term fluctuating power and maintain the supercapacitor voltage within the designed operating range in the steady as well as transient state. When the average and fluctuating component of power increases instantaneously, the RESC compensates fluctuating power and the variation of fluctuating power is reduced 100% to 30% at 5kW power. Furthermore, supercapacitor voltage is maintained within the operating voltage range and near 50% of total energy. Feasibility of SCESS with RESC control is verified through simulation and experiment.

• 제어로봇시스템학회:학술대회논문집
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• 2003.10a
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• pp.2418-2423
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• 2003

Bluetooth is a low cost, license-free, and short-range radio communication technology. This gradually gaining de facto standard for applications of a personal area network over the world. To make it further popular, it should provide faster and more flexible connectivity than that supported by the existing bluetooth specification. This paper proposes a new Ad hoc scatternet formation algorithm that supports those connectivity under circumstances such that devices can not get in direct touch with one another; say out-of-bounded case. It also maintains the character that those connectivity minimizes the number of piconets when all devices are in the communication range with one another, say in-bounded case, as pervious works.

• Journal of Agricultural Extension & Community Development
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• v.16 no.4
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• pp.837-867
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• 2009

The purpose of this study is evaluate the direct payment program for rural landscape conservation and deduce facts to improve. This research is composed with a survey on local government officials and farmers joined this program, and used monitering in selected 41 zones. According to the surveys, this program showed a positive contribution to the effects: village harmony, visitors increase, village income. However, It's contribute in short term objectives, but has not yet reach the ultimate goal such as regional development through visitors and village income. We found some problems in the monitering, on the agreement with farmers, range of village activities, operating AgriX program, etc. Finally, we suggest some proposals ; 1) to redefine the aims and range for the program, 2) to clarify a village action program, 3) to strength the admission procedure, 4) to designate district based on landscape resources survey.

• Journal of the Korean Home Economics Association
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• v.42 no.10 s.200
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• pp.63-77
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• 2004

The overuse of Internet has caused the problem of 'Internet addiction' in the life of college students. The purpose of this study was to develop a program of time management education for preventing Internet addiction among college students. The program consists of sessions. The first session is an introduction to the program which includes a pre-test about Internet addiction. The second session is designed to allow them to check their pattern of Internet use and time use by themselves. The third session is designed to set their tie goals and make long-range plans. The fourth session is designed to make short-range plans and look for alternative activities. The final session is the completion of the program. This study has some significance in developing a time management program for Internet addiction. and will be utilized in practical education.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2002.05a
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• pp.195-198
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• 2002

Demand for high precision measurement of large area is increasing in many industrial fields. White-light Scanning Interferometer(WSI) is a well-known method for 3D profile measurement. However WSI has some limitations in a measurement range because of the sensing mechanism. Therefore, in this paper we use a heterodyne laser interferometer to get over the limitations of a short measurement range in WSI, We suggest a new WSI system combined with heterodyne laser interferometer. This system is aimed at eliminating Abbe error with measuring the focus point directly. With the use of triggering functionality of WSI, we can use this system as a probe of a precision stage such as a probe of CMM. The suggested system gives a repeatability of 87 nm in the absolute distance measurement test under the laboratory environment.

• Journal of Chest Surgery
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• v.28 no.3
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• pp.247-252
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• 1995

The isolated coronary ostial stenosis is rare and a critical lesion which requires urgent surgical intervention. Recently direct angioplasty is assumed as a preferable approach to conventional bypass grafting. From Mar. 1990 to Aug. 1993, six patients underwent direct angioplasty in Sejong Heart Institute. The mean age of 6 patients was 48 years [range 37 to 63 and they consisted with 5 females and one male. All had severe angina [class III or IV of short duration [mean 5.3 months and a low incidence of risk factors. Despite the crucial location of the lesion, most patients had well preserved left ventricular function and normal wall motion. We performed direct angioplasty with autologous pericardium via anterior approach except one patient who underwent direct angioplasty and CABG. One patient died 4 hours after angioplasty probably due to acute coronary dissection. The survived 5 patients maintain normal life without symptoms during 26.2 months follow up [range 5 to 47 months .Our preliminary results suggest that angioplasty of isolated coronary ostial stenosis in highly selected patient can be carried out with good results and relatively low operative risks.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2005.05a
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• pp.191-196
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• 2005

Unpreparedness of the maintenance regulations is regarded as the main reason for the short life span of the multi-owned commercial residential buildings. This study suggests that the followings should be prepared for the effective maintenance and life prolongation of the multi-owned commercial residential buildings : 1) Standard maintenance regulations for those buildings should be set up, 2) Building maintenance works should be performed by the specialists, like licensed building manager, mechanical and electrical engineers, etc., 3) Long-range repair expenses should be laid by on the monthly base according to the long-range repair plan, 4) Regulations concerning the defect repair should be provided properly.

• The Korean Journal of Financial Management
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• v.13 no.1
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• pp.101-114
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• 1996

본 연구에서는 우리나라 주식시장에서 주가의 장기적 종속성이 존재하는지의 여부를 평가하기 위하여 Lo(1991)의 검증방법론을 이용하여 실증분석을 실시하였다. 본 연구에서 발견된 실증분석 결과는 다음과 같이 요약될 수 있다. 첫째, 일별수익률자료를 이용한 검증에서는 한국종합주가지수 등 대부분의 주가지수에서 단기적 종속성(short-range dependence)이 발견되고 있으나, 장기적 종속성(long-range dependence)의 증거는 나타나지 않고 있다. 둘째, 월별수익률자료를 이용한 검증에서는 일부 주가지수에만 단기적 종속성이 나타나고 있을 뿐, 대부분의 주가지수에서 랜덤웍 모형을 기각할 수 없었다. 이상의 실증분석 결과는 우리나라 주식시장에서 주가에는 장기적 중속성이 존재하지 않는다는 가설과 일관성을 갖는 것이다.

• ETRI Journal
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• v.32 no.5
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• pp.827-830
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• 2010

For an adaptive cruise control (ACC) stop-and-go system in automotive applications, three radar sensors are needed because two 24 GHz short range radars are used for object detection in an adjacent lane, and one 77 GHz long-range radar is used for object detection in the center lane. In this letter, we propose a single sensor-based 24 GHz radar with a detection capability of up to 150 m and ${\pm}30^{\circ}$ for an ACC stop-and-go system. The developed radar is highly integrated with a high gain patch antenna, four channel receivers with GaAs RF ICs, and back-end processing board with subspace based digital beam forming algorithm.