• 대한임베디드공학회논문지
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• 제15권5호
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• pp.205-214
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• 2020

With the recent development of hardware and software technology, interest in the development of wearable devices is increasing. In particular, wearable devices require algorithms suitable for low-power and low-capacity embedded devices. Among them, there is an increasing demand for a signal compression algorithm that reduces communication overhead, in order to increase the efficiency of storage and transmission of electrocardiogram (ECG) signals requiring long-time measurement. Because normal beats occupy most of the signal with similar shapes, a high rate of signal compression is possible if normal beats are represented by a template. In this paper, we propose an algorithm for determining the normal beat template using the template cluster and Pearson similarity. Also, the template is expressed effectively as a few vertices through linear approximation algorithm. In experiment of Datum 234 of MIT-BIH arrhythmia database (MIT-BIH ADB) provided by Physionet, a compression ratio was 33.44:1, and an average distribution of root mean square error (RMSE) was 1.55%.

• The Journal of Korean Physical Therapy
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• 제21권4호
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• pp.51-56
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• 2009

Purpose: This study examined the difference in the static balance ability according to the visual cues and postural tasks in normal subjects. Methods: Thirty participants (12 male, 18 female; mean age $24.63\pm1.43$ years) stood barefoot on a force platform in a one-legged stance, tandem Romberg stance and tandem Romberg with neck extension stance with a visual cue open and closes. The static balance was assessed by the center of pressure (CoP), surface electromyography root mean square (RMS) of the leg muscles according to the stance position. Results: In the CoP tests, the difference in the unit path length and circumference area was affected by the visual cue according to the stance posture (p<0.01). In the RMS tests, the difference in the tibialis anterior and medial gastrocnemius muscle was affected by visual cue in accordance with the stance posture (p<0.01). Conclusion: The visual cue and postural task affect the balance ability in normal subjects. Therefore, this study provides clinical evidence that the balance and postural control can be improved. Therapeutic intervention, such as an obstacle course, and a lower leg muscle performance program with a change in the base of support can affect the balance and postural control.

• 동의생리병리학회지
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• 제19권4호
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• pp.897-902
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• 2005

Internal deficiency of vital Qi is origination of cancer and root cause of its development from the viewpoint of traditional Chinese medicine(TCM). For about 40 years, China has developed a combined system of TCM and Western medical system in treatment of cancers, laying stress on the therapeutic principle of strengthening the body resistance and restoring normal functioning of the body to consolidate the constitution (Fu Zheng Pei Ben). According to the results of the latest clinical and experimental studies, Chinese medicine not only increases curative effectiveness, but also reduces the side effect caused by the toxic, radio and chemical treatment of cancer cases in the western medical system as well as various complications. Long-term taking Chinese herbal medicine prevents recurrence and metastasis of tumor, and heightens long-term curative effectiveness after western medical treatments. It also helps to relieve symptoms, improve the quality of life, and prolong life of terminal cancer patients who have already lost opportunities of western medical treatments. In addition, it can prevent and cure premonitory symptoms of cancer.

• 한국컴퓨터정보학회논문지
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• 제8권1호
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• pp.103-113
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• 2003

프로그램 행위 침입 탐지 기법은 데몬 프로그램이나 루트 권한으로 실행되는 프로그램이 발생시키는 시스템 호출들을 분석하고 프로파일을 구축하여 침입을 효과적으로 탐지한다 시스템 호출을 이용한 이상 탐지는 단지 그 프로세스가 이상(anomaly)임을 탐지할 뿐 그 프로세스에 의해 영향을 받는 여러 부분에 대해서는 탐지하지 못하는 문제점을 갖는다. 이러한 문제점을 개선하는 방법이 베이지안 확률값 이용하여 여러 프로세스의 시스템 호출간의 관계를 표현하고, 베이지안 네트워크를 이용한 어플리케이션의 행위 프로파일링에 의해 이상 탐지 정보를 제공한다. 본 논문은 여러 침입 탐지 모델들의 문제점들을 극복하면서 이상 침입 탐지를 효율적으로 수행할 수 있는 베이지안 네트워크를 이용한 침입 탐지 방법을 제안한다 행위의 전후 관계를 이용한 정상 행위를 간결하게 프로파일링하며, 변형되거나 새로운 행위에 대해서도 탐지가 가능하다. 제안한 정상행위 프로파일링 기법을 UNM 데이터를 이용하여 시뮬레이션하였다.

• 사상체질의학회지
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• 제20권2호
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• pp.53-57
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• 2008

1. Objectives When we give Jowiseungcheong-tang to Taeumin patients, analyzing a change of their autonomic nervous system. It is measured by the heart rate variability(HRV) analyzer. 2. Methods We give Jowiseungcheong-tang to ten Taeumin patients for three days and examine the HRV at first time and three days later. 3. Results and Conclusions We compared two HRV results. The value of RRNN(average of normal RR intervals), SDNN(the standard deviation of all normal RR intervals), RMSSD(the root mean square of successive differences between the normal heart beats) have a downward tendency. Norm HF(normalized high frequency power) have a upward tendency. norm LF (normalized low frequency power) and LHR(LF/HF ratio) have a downward tendency. It means hypofunction of autonomic nervous system. But all results are not significant. We think that restudy is needed with more patients and longer periods afterward.

• Journal of Astronomy and Space Sciences
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• 제19권4호
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• pp.385-394
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• 2002

SLR(Satellite Laser Ranging)은 위성과 관측소간 거리를 가장 정밀하게 측정할 수 있는 시스템이다. 1964년 발사된 Beacon-B 위성의 궤도결정을 위해 SLR 기술이 처음 사용되었는데 거리측정 정밀도가 m 수준이었다. 현재 single shot 정밀도는 cm, NP(Normal Point)는 mm수준으로 발전하였다. 이 연구에서는 SLR을 이용한 궤도결정 알고리즘을 개발하여 GPS(Global Positioning System)-36위성의 정밀 궤도를 결정하였다. 알고리즘의 정밀도를 검증하기 위해 산출한 정밀 궤도를 IGS(International GPS Service)에서 제공하는 정밀 궤도력과 비교하였는데 74cm의 RMS(Root Mean Square)를 얻었다. 또한, SLR 시스템의 관측잔차 RMS는 55mm 미만으로 알려져 있지만 이 연구에서는 44mm 결과를 얻을 수 있었다.

• 신재생에너지
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• 제20권1호
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• pp.79-87
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• 2024

This study introduces a method for estimating Aerosol Optical Depth (AOD) using Broadband Aerosol Optical Depth (BAOD) derived from direct normal irradiance and meteorological factors observed between 2016 and 2017. Through correlation analyses between BAOD and atmospheric components such as Rayleigh scattering, water vapor, and tropospheric nitrogen dioxide, significant relationships were identified, enabling accurate AOD estimation. The methodology demonstrated high correlation coefficients and low Root Mean Square Errors (RMSE) compared to actual AOD₅₀₀ measurements, indicating that the attenuation effects of water vapor and the direct impact of tropospheric nitrogen dioxide concentration are crucial for precise aerosol optical depth estimation. The application of BAOD for estimating AOD₅₀₀ across various time scales-hourly, daily, and monthly-showed the approach's robustness in understanding aerosol distributions and their optical properties, with a high coefficient of determination (0.96) for monthly average AOD₅₀₀ estimates. This study simplifies the aerosol monitoring process and enhances the accuracy and reliability of AOD estimations, offering valuable insights into aerosol research and its implications for climate modeling and air quality assessment. The findings underscore the viability of using BAOD as a surrogate for direct AOD₅₀₀ measurements, presenting a promising avenue for more accessible and accurate aerosol monitoring practices, crucial for improving our understanding of aerosol dynamics and their environmental impacts.

• 대한소아치과학회지
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• 제32권3호
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• pp.576-583
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• 2005

치아의 형성은 상피-간엽간의 상호작용을 통해 조절되어지는 복잡한 발생과정이다. 지금까지 치관의 발생에 관여하는 유전자 및 그들의 신호전달경로에 관한 연구는 다수 진행되어 왔지만 치근의 발생을 조절하는 기전에 대해서는 별로 알려진 것이 없다. 최근에 NFI-C knock out 생쥐에서 정상치관에 비정상적인 치근을 가지는 치아가 보고되었다. 본 연구의 목적은 NFI-C가 어떻게 치근의 형태와 상아모세포의 분화에 관여하는지를 규명하는 것이다. NFI-C knock out 생쥐의 치근 발생동안에 HERS의 역할을 연구하고자 cytokeratin 면역조직화학적방법과 치근상아질의 특성을 규명하기 위해 DSPP mRNA in-situ hybrydization법을 수행하였다. 1. NFI-C knock out 생쥐의 치근형성시 HERS의 역할 Wild type과 knock out type 모두에서 cytokeratin은 모든 HERS 세포들과 반응하였고, HERS와 법랑상피 사이의 양성반응세포들의 연속성은 치경부 부위에서 소실되었다. Knock out type에서 치근상아질이 침착된 후, cytokeratin 양성-HERS 세포들은 치경부에서 불규칙한 배열과 극성의 상실을 보였다. 2. NFI-C knock out 생쥐의 치근상아질의 특성 DSPP mRNA의 발현은 wild type에서 치관과 치근상아질의 상아모세포 모두에서 강한 발현을 보인 반면, knock out type에서는 치관부위 상아질의 상아모세포에서만 강한 발현을 보였다. 3. NFI-C knock out 생쥐의 치근 발생과정에서 HERS는 치관으로부터 정상적인 확장을 보인 반면, 치근부위에서의 상아 모세포 분화는 실패하였다. 위의 결과들로 보아 NFI-C는 치근형성 과정에서 상아모세포 분화에 중요한 역할을 하는 것으로 사료된다.

• 한국기계가공학회지
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• 제13권5호
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• pp.15-20
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• 2014

The wind industry grew in the first decade of the 21st century at rates consistently above 20% a year. For wind turbine, gearbox failure can be extremely costly in terms of repair costs, replacement parts, and in lost power production due to downtime. In this paper, gear tooth micro-modification for the high speed stage was used to compensate for the deformation of the teeth due to load and to ensure a proper meshing to achieve an optimized tooth contact pattern. The gearbox was firstly modeled in a software, and then the various combined tooth modification were presented, and the prediction of transmission under the loaded torque for the helical gear pair was investigated, the normal load distribution and root stress were also obtained and compared before and after tooth modification under one torque. The simulation results showed that the transmission error and normal load distribution under the load can be minimized by the appropriate tooth modification. It is a good approach where the simulated result is used to improve the design before the prototype is available for the test.

• 한국약용작물학회지
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• 제24권4호
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• pp.277-283
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• 2016

Background: The photosynthetic efficiency cool-season, semi-shade ginseng is normal at low morning temperatures, but drops at high afternoon temperatures. Therefore, optimal plant performance would be ensured if it were possible to control daily light transmission rates (LTR). Methods and Results: Plants were grown in a controlled light environment that replicated 11 AM conditions and comparatively analyzed against plant grown under normal conditions. Growth in the controlled light environment resulted in a 2.81 fold increase in photosynthetic efficiency with no change in chlorophyll content, although LTR were high due to low morning temperatures. Increased aerial plant growth was observed in the ginseng plants adapted to the controlled light environment, which in turn influenced root weight. An 81% increase in fresh root weight (33.3 g per plant on average) was observed in 4-year-old ginseng plants grown in controlled light environment compared to the plants grown following conventional practices (18.4 g per plant on average). With regard to the inorganic composition of leaves of 4-year-old ginseng plants grown in controlled light environment, an increased in Fe content was observed, while Mn and Zn content decreased, and total ginsenoside content of roots increased 2.37 fold. Conclusions: Growth of ginseng under a favorable light environment, such as the condition which exist naturally at 11 AM and are suitable for the plant's photosynthetic activity creates the possibility of large scale production, excellent-quality ginseng.