• Title, Summary, Keyword: low-maintenance

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Comparison of Cardiopulmonary Effects and Recovery between Total Intravenous Anesthesia with Propofol and Volatile Induction/maintenance Anesthesia with Isoflurane in Beagle Dogs (비글견에서 Propofol 완전정맥마취와 Isoflurane 휘발성 유도/유지 마취 시 심폐기능과 회복의 비교)

  • Lee Soo-Han
    • Journal of Veterinary Clinics
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    • v.22 no.3
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    • pp.259-263
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    • 2005
  • To compare cardiopulmonary effects and recovery between total intravenous anesthesia (TIVA) with propofol (PRO group, n=5) and volatile induction/maintenance anesthesia (VIMA) with isoflurane (ISO group, n=5), we investigated changes of heart rate, $SpO_2$, arterial pressure, rectal temperature and respiratory rate during 60 minute anesthesia and 40 minute recovery period in beagle dogs, and investigated recovery (extubation, head lift, sternal position and righting) after 60 minute anesthesia. Rectal temperature was significantly low in ISO group (p<0.05) from 10 to 100 minute. Heart rate was significantly low in ISO group (p<0.05) at 40, 50, 60 minute. Respiratory rate was significantly low in PRO group (p<0.05) at induction and 70 minute. $SpO_2$ tendency was similar. Systolic arterial pressure (SAP) was significantly low in ISO group (p<0.05) at induction and during anesthesia. Recovery was similar in two groups. We concluded that TIVA with propofol is useful in stabilizing rectal temperature and arterial pressure during anesthesia and provide fast and stable recovery.

A Method to Enhance Dynamic Range for Seismic Sensor Using ARMA Modelling of Low Frequency Noise and Kalman Filtering (지진계 저주파수 잡음의 ARMA 모델링 및 칼만필터를 이용한 지진계 동적범위 향상 방법)

  • Seong, Sang-Man;Lee, Byeung-Leul;Won, Jang-Ho
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.19 no.4
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    • pp.43-48
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    • 2015
  • In this study, a method to enhance the dynamic range of seismic sensor is proposed. The low frequency noise included in the measurement of seismic sensor is modelled as an ARMA(Auto Regressive Moving Average) model and the order and parameters of the model are identified through system identification method. The identified noise model is augmented into Kalmman filter which estimate seismic signal from sensor measurement. The proposed method is applied to a newly developed seismic sensor which is MEMS based 3-axis accelerometer type. The experiment show that the proposed method can enhance the dynamic range compared to the simple low pass filtering.

A Case Study on the Maintenance Activities of the Naturally Favorable Water Space Through the Participation of Residents - A case of Japanese rural areas - (주민참여에 의한 농촌지역 친수공간 유지관리활동 사례분석 - 일본 농촌지역을 사례로 -)

  • Yang, Yong-Seok;Kim, Sun-Joo;Senga, Yutaro
    • Journal of Korean Society of Rural Planning
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    • v.12 no.1
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    • pp.11-21
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    • 2006
  • The purpose of this study is to verify the result of the previous studies and to clarify the types and activation factors of maintenance activities of the naturally favorable water space through the participation of residents in rural areas, through a further survey of the area proposed as a program in the existing study review and previous study related to the participation of residents. The survey was conducted through the survey of 1,242 households and 1,335 persons intended for Japanese rural areas. The study result is summarized as follows. The types of the maintenance activities in the areas intended for the survey have been classified into 'rural type' and 'combination type' through the analysis results by the references like the comparison analysis, job percentage and main utilization purpose of facilities for each type of maintenance and operation activities. In case of the 'rural type' area, residents were doing maintenance activities centered on the group activities rather than personal maintenance activities. Also, the activities of maintenance & operation group members were more active than non-members, and the water-friendly utilization to the facilities was not directly affecting the maintenance activities of residents. In case of the 'combinational type' area, there was no common characteristic according to each area, and the participation percentage in the maintenance activities was low compared with the 'rural type' area. According to the analysis result based on the participation degree of personal maintenance activities, the repair of facilities as a naturally favorable water space, implementation of projects reflecting the opinions of residents, educational programs conducted in order to motivate the participation of residents, etc. have been analyzed as the factors affecting the activation of maintenance activities of residents. Through the above results, for continuous maintenance activities to be made with residents as a main body in the future, it is necessary to support maintenance groups on an administrative level and procure experts for the production and operation of programs that can increase the participation percentage of residents.

Identifying latent classes about the changing trajectories of child maltreatment by child developmental period (아동발달시기별 아동학대 변화궤적 유형 비교 연구)

  • Han, Jihyeon;Choi, Okchae
    • Journal of the Korean Society of Child Welfare
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    • no.59
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    • pp.183-208
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    • 2017
  • The purpose of this study was to identify groups depending on the change trajectory of child maltreatment in childhood and early adolescence. For this study, the data from waves two through six (2011-2015) of the Korean Children and Youth Panel Survey (KCYPS) were used. Participants included first-grade (n=2,300) and fourth-grade (n=2,325) elementary school students. A latent class growth model (LCGM) using Mplus 7.21 was adopted to classify the types of developmental trajectories of child maltreatment. The main results were as follows: First, in physical abuse, childhood from the second to the sixth grades was classified into four groups: decreased, low maintenance, increased, and no maltreatment type. In addition, early adolescence from the fifth grade of elementary school to the third grade of middle school was also classified into the same types. Second, in emotional abuse, childhood was classified into three groups: decreased, increased, and no maltreatment type. Early adolescence was classified into four groups: decreased, low maintenance, increased, and no maltreatment type. Third, in neglect, childhood was classified into four groups: maintenance, low decreasing, low increasing, and no maltreatment type. Early adolescence was classified into three groups: maintenance, low increasing, and no maltreatment type. According to the change of child maltreatment by developmental period, physical abuse continued from childhood to early adolescence, whereas emotional abuse and neglect increased in early adolescence compared to childhood. This study is meaningful in classifying latent classes depending on maltreatment types. Theoretical and practical implications were suggested based on the study results.

Properties of Strength Development Under Various Curing Condition at Early Age of Cement Mortar Using Agent for Enduring Cold Weather (내한성 혼화제를 이용한 시멘트 모르타르의 초기양생 온도변화에 따른 강도증진 특성)

  • Han, Cheon-Goo;Hong, Sang-Hee;Kim, Hyun-Woo
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.5 no.2
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    • pp.191-197
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    • 2001
  • In this study, the admixtures for agents for enduring cold weather used widely are collected and applied to cement mortar to analyze the strength development due to variation of curing temperature at early age. The test results show that anti-freezing admixture have some problems due to high chloride content, which may cause the corrosion of reinforcement embedded in concrete. However, the mortar applied by accelerator and another kind of agent for enduring cold weather produced by S company lead to delay of strength development in low temperature. Also, it is clarified that there are no significant problems for cement mortar in strength development due to low temperature if a suitable kind of agent enduring cold weather is used and cement mortar is cured for more than $7.5^{\circ}D.D$ at early age.

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Comparison of Adjustments to Drought Stress Among Seedlings of Several Oak Species

  • Kim, Joon-Ho
    • Journal of Plant Biology
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    • v.37 no.3
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    • pp.343-347
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    • 1994
  • In order to compare the adjustment of 6 oak species to water stress, the components of water status, tissue elastic modulus, free proline content of leaves and morphological characteristics were determined in pot culture. uercus dentata and . mongolica responded effectively to drought with high root : shoot (R/S) ratio or maintenance of high turgor pressure by large and fast osmotic adjustment and . variabilis with maintenance of high turgor pressure by low elastic modulus under drought. Meanwhile, . aliena and . serrata responded effectively with low omotic potential (Ψo) at full saturation and . acutissima with long root in spite of rigid cell wall and high osmotic potential (Ψo) at full saturation. Proline content in leaves of . dentata, . mongolica and . aliena increased early and rapidly at high leaf water potential (Ψleaf). The results indicate that 6 oak species have adjustment different from each other to water stress.

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A Study on the Repair and Strengthening Effects of Epoxy Grout for the Damaged Concrete Structure (손상된 콘크리트 구조물에 에폭시수지를 이용한 보수·보강효과에 대한 연구)

  • Shin, Sung-Woo;Cho, Tai-Kwan
    • Journal of the Korea institute for structural maintenance and inspection
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    • v.1 no.1
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    • pp.125-132
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    • 1997
  • This study was intended to investigate the effects of epoxy grout on compressive strength for damaged concrete structures. For this purpose, concrete molds were manufactured and tested for compressive strength at 28 days after water curing. Two kinds of Korea-made and one Japan-made epoxy grouts were injected into the broken concrete molds with the automatic low-pressure injecting method or the hand injecting method.

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Optimal Design of Cement Mortar Pouring type Paved Track (시멘트모르터 충진형 포장제도의 최적 설계)

  • Lee, Il-Wha
    • Journal of the Korean Society for Railway
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    • v.9 no.2
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    • pp.222-229
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    • 2006
  • Recently, the development of the paved track is required as a low-maintenance of conventional line. The main reason is that the line capacity and bearing of track are increased progressively. The important factors of paved track are stability and applicability. To be based on this subject, Cement Mortar Pouring(CMP) paved track is developed. CMP paved track is a kind of ballast reinforced track using the prepacked concrete technique. The most important thing to design the paved track is to optimize the track structure considering various conditions. Because construction environment is very limited, cost is expensive and it has very complicated behavior. On this paper, structural characteristics of the paved track are investigated using the 3D finite element analysis to verify the optimized structure of the CMP track.

A Study on The Effective Classification of Signal Facilities using LCC Analysis (LCC 분석을 이용한 효과적인 신호 설비 분류에 관한 연구)

  • Kim, Doo-Suk;Kim, Young-Hoon;An, Chan-Gi;Jang, Seong-Yong
    • Proceedings of the KSR Conference
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    • pp.2711-2717
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    • 2011
  • This paper presents the classification scheme of the signal facilities on the railroad considering the construction costs and maintenance costs in a low population area. The construction costs of the new signal facility system can be compare with the costs of the present signal facilities as the classification scheme. The signal facilities on the railroad were classified as the railroad security regulations and then the scheme is considered through the LCC analysis. In order to test this research, the costs of signal facilities obtained from ones on TAEBACK railroad line. The costs categorized the construction costs, the labor cost and the maintenance costs can be effectively applied to the LCC analysis. The scheme is very useful to make a decision whether the new signal facilities on railroad in low population area is build or not in terms of the costs.

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A Study on the Development of Doorstep Equipment for Both the Low and the High Level Platforms - Focus on Conceptual Design & Prototype's Vibration Test Result - (저상 고상 승강장 겸용 승강시스템 기술개발에 관한 연구 - 개념설계 및 시작품의 진동시험 결과를 중심으로 -)

  • Park, Min-Heung;Lee, Jeong-Hun;Choi, Deuck-Ho;Kim, Chul-Su
    • Proceedings of the KSR Conference
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    • pp.2979-2986
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    • 2011
  • In this study, we review all matters for system application based on the international and the domestic standards. Considering the minimization of bottom frame damage, ease of maintenance, withstanding-environmental performance (condensation or rain), maintenance of airtightness, customer convenience and safety issues in railway vehicle, the conceptual design for doorstep equipment for both the low and the high level platforms is carried out. On the basis of conceptual design, the prototype is manufactured. We perform the vibration test based on the international standard IEC-61373 for securement of the reliability and enhancement of design & production. Finally we would like to describe the test results.

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