• Title/Summary/Keyword: Primary Si

Search Result 534, Processing Time 0.03 seconds

Effect of Acupuncture Treatment on the Primary Dysmenorrhea;A Study of Single Blind, Sham Acupuncture, Randomized, Controlled Clinical Trial (원발성 월경곤란증의 침치료 효과에 대한 임상시험)

  • Youn, Hyoun-Min;Kim, Cheol-Hong;Park, Jae-Heung;Han, Min-Seok;Lee, In-Sun;Choi, Sun-Mi;Park, Ji-Eun;Kim, Kyu-kon
    • Journal of Acupuncture Research
    • /
    • v.25 no.3
    • /
    • pp.139-162
    • /
    • 2008
  • Objectives : Korean tradithional acupuncture Theory, Sa-am's 5 phases acupuncture method was originated in 1644-1742, in the middle of the Cho Sun dynasty. This study was to vertify the effect of Sa-am Acupuncture Treatment on Primary dysmenorrhea of Women. Methods : The subjects were 80 volunteers who was suffering for dysmenorrhea, employed using Measure of Menstrual Pain (MMP) questionnaire. Subjects were divided into two groups including Sa-am acupuncture treatment group(n=25), minimal acupuncture treatment group(n=22). They had agreed to take part in this experiment, with didn't take any anodyne drugs. In the acupuncture group, subjects were stimulated at G41, $SI_3$, B66, $SI_2$(Small intestine jung-guk), $SP_6$, $CV_6$ and one points were inserted additionally depending the symptoms among $ST_{36}$ or $LI_2$. In the control group, subjects were needled at 5 non-acupuncture points have any effect on Dysmenorrhea. A total of 8 acupuncture sessions were performed for each patient depending on the individual menstruation cycle The MMP score by using 7 questions and the Menstrual Symptom Severity List(MSSL-D) was measured before and after menstruation cycle. Collected data were analyzed as frequency, percentage, paired t-test, independent t-test using SPSS 10.0 WIN Program. Results : Acupuncture treatment produced a significant decreasing the symptom of Primary dysmenorrhea in two groups, but a statistically significant difference was not shown in the acupuncture group compare to control group. Conclusions : Based on the above results, it was verified that Acupuncture Treatment was effective in decreasing the symptom of Primary Dysmenorrhea.

  • PDF

Determination of Layer Thickness of A/B Type Multilayer Films in SIMS Depth Profiling Analysis

  • Hwang, Hyun-Hye;Jang, Jong-Shik;Kang, Hee-Jae;Kim, Kyung-Joong
    • Proceedings of the Korean Vacuum Society Conference
    • /
    • 2012.08a
    • /
    • pp.231-231
    • /
    • 2012
  • Correct determination of the interface locations is critical for the calibration of the depth scale and measurement of layer thickness in SIMS depth profiling analysis of multilayer films. However, the interface locations are difficult to determine due to the unwanted distortion from the real ones by the several effects due to sputtering with energetic ions. In this study, the layer thicknesses of Si/Ge and Si/Ti multilayer films were measured by SIMS depth profiling analysis using the oxygen and cesium primary ion beam. The interface locations in the multilayer films could be determined by two methods. The interfaces can be determined by the 50 at% definition where the atomic fractions of the constituent layer elements drop or rise to 50 at% at the interfaces. In this method, the raw depth profiles were converted to compositional depth profiles through the two-step conversion process using the alloy reference relative sensitivity factors (AR-RSF) determined by the alloy reference films with well-known compositions determined by Rutherford backscattering spectroscopy (RBS). The interface locations of the Si/Ge and Si/Ti multilayer films were also determined from the intensities of the interfacial composited ions (SiGe+, SiTi+). The determination of the interface locations from the composited ions was found to be difficult to apply due to the small intensity and the unclear variation at the interfaces.

  • PDF

Synthesis and Electrochemical Performance of Li2MnSiO4 for Lithium Ion Battery Prepared by Amorphous Silica Precusor (비정질 실리콘 산화물을 이용한 리튬망간실리콘산화물의 합성 및 전기화학적 특성 평가)

  • Jin, Yun-Ho;Lee, Kun-Jae;Kang, Lee-Seung;Jung, Hang-Chul;Hong, Hyun-Seon
    • Journal of Powder Materials
    • /
    • v.19 no.3
    • /
    • pp.210-214
    • /
    • 2012
  • Mass production-capable $Li_2MnSiO_4$ powder was synthesized for use as cathode material in state-of-the-art lithium-ion batteries. These batteries are main powder sources for high tech-end digital electronic equipments and electric vehicles in the near future and they must possess high specific capacity and durable charge-discharge characteristics. Amorphous silicone was quite superior to crystalline one as starting material to fabricate silicone oxide with high reactivity between precursors of sol-gel type reaction intermediates. The amorphous silicone starting material also has beneficial effect of efficiently controlling secondary phases, most notably $Li_xSiO_x$. Lastly, carbon was coated on $Li_2MnSiO_4$ powders by using sucrose to afford some improved electrical conductivity. The carbon-coated $Li_2MnSiO_4$ cathode material was further characterized using SEM, XRD, and galvanostatic charge/discharge test method for morphological and electrochemical examinations. Coin cell was subject to 1.5-4.8 V at C/20, where 74 mAh/g was observed during primary discharge cycle.

The Preservice Teachers등 Understanding of the International System of Units (국제단위제도에 대한 초등학교 예비 교사들의 이해)

  • 김성규;김윤경
    • Journal of Korean Elementary Science Education
    • /
    • v.23 no.1
    • /
    • pp.27-36
    • /
    • 2004
  • This paper aims to examine how well university students, who are going to be primary school teachers, understand the International System of Units (SI), focusing on seven basic units such as 'm', '㎏', '㏖', 'A', 'K', 's', 'cd'. This study specifically investigates whether the students know the seven units and understand their uses and how they read and learn them. The subjects were 1030 students from the University of Education in Jinju, Geongsangnamdo. Data was collected through a questionnaire which was designed by this researcher and checked by an authority, and the frequency and percentage of reponses to each question were obtained and analysed. Findings show all the students knew very well that 'm' and '㎏' are included in the seven units, compared to the others which low percentage of the students considered as the elements. In terms of understanding of use, the units of the length 'm', the mass '㎏', and the time 's' are well understood, presumably, because they are often used in ordinary life and school, while the amount of substance '㏖', the electric current 'A', the thermodynamic temperature 'K', and the luminous intensity 'cd' are not as well understood. It is probably because 'A', 'cd', and 'K' are hardly used in everyday life. With respect to reading the units, the subjects read 'm', '㎏', '㏖', and's' much better than the others. As for the source of learning them, most students answered they learned them in schools, which implies school education is very important. From these results it is concluded that school education should be accompanied with use in everyday life for understanding and using the units. SI Base Units understanding was investigated by an academic year. According to this investigation, generally the right answer rate differed 4<2<3<1 by an academic year in order. For the Senior, Sophomore appeared the right answer rate more high. because, they learned before in deepening or elementary course on chemistry and physics related with SI Base Units. On the other hand, for the junior answered low rate by this reason that they couldn't remember about SI Base Units that learned before. For the Freshman appeared low rate by this reason that they were not learned or graduated from the department of liberal art in high school.

  • PDF

High Temperature Fatigue Deformation Behavior of Automotive Heat Resistant Aluminum Alloys (자동차 부품용 내열 알루미늄 합금의 고온 피로 변형 거동)

  • Park, Jong-Soo;Sung, Si-Young;Han, Bum-Suck;Jung, Chang-Yeol;Lee, Kee-Ahn
    • Korean Journal of Metals and Materials
    • /
    • v.48 no.1
    • /
    • pp.28-38
    • /
    • 2010
  • High temperature high cycle and low cycle fatigue deformation behavior of automotive heat resistant aluminum alloys (A356 and A319 based) were investigated in this study. The microstructures of both alloys were composed of primary Al-Si dendrite and eutectic Si phase. However, the size and distribution for eutectic Si phase varied: a coarse and inhomogeneous distributed was observed in alloy B (A319 based). A brittle intermethallic phase of ${\alpha}-Fe\;Al_{12}(Fe,Mn)_3Si_2$ was detected only in B alloy. Alloy B exhibited high fatigue life only under a high stress amplitued condition in the high cycle fatigue results, whereas alloy A showed high fatigue life when stress was lowered. With regard to the low-cycle fatigue result ($250^{\circ}C$) showing higher fatigue life as ductility increased, alloy A demonstrated higher fatigue life under all of the strain amplitude conditions. Fractographic observations showed that large porosities and pores near the outside surface could be the main factor in the formation of fatigue cracks. In alloy B. micro-cracks were formed in both the brittle intermetallic and coarse Si phasese. These micro-cracks then coalesced together and provided a path for fatigue crack propagation. From the observation of the differences in microstructure and fractography of these two automotive alloys, the authors attempt to explain the high-temperature fatigue deformation behavior of heat resistant aluminum alloys.

Analysis of Phase Separation by Thermal Aging in Duplex Stainless Steels by Magnetic Methods

  • Kim, Sunki;Wonmok Jae;Kim, Yongsoo
    • Nuclear Engineering and Technology
    • /
    • v.29 no.5
    • /
    • pp.361-367
    • /
    • 1997
  • The phase separation in ferrite phase of duplex stainless steel is the primary cause of thermal aging embrittlement of the LWR primary pressure boundary components. In this study the phase separation of simulated duplex stainless steel was detected by Mossbauer spectroscopy and magnetic property analysis by VSM(Vibrating Specimen Magnetometer). The simulated duplex stainless steels, Fe-Cr binary, Fe-Cr-Ni ternary, and Fe-Cr-Ni-Si quarternary allots, were aged at 370 and 40$0^{\circ}C$ up to 5,340 hours. It was observed from Mossbauer spectra analysis that internal magnetic field increases with aging time and from VSM that the specific saturation magnetization and Curie temperature increase with aging time. These result are indicative that phase separation into Fe-rich region and Cr-rich region is caused by thermal aging in the temperature range of 370~40$0^{\circ}C$ In cases of specimens containing Ni, the increase of specific saturation magnetization is much higher. This implies that Ni seems to promote Fe-Cr interdiffusion, which accelerates the phase separation into Fe-rich $\alpha$ phase and Cr-rich $\alpha$' phase.

  • PDF

Half-Bridge Resonant Converter with Coreless Isolation Transformer (공심 절연변압기를 구비한 반브릿지 공진형 컨버터)

  • Heo, Joon;Jeon, Seong-Jeub
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.66 no.4
    • /
    • pp.636-642
    • /
    • 2017
  • Recently, new power devices, SiC and GaN FETs, are commercialized. They are expected to change power electronics environments. They will raise operating frequencies of power electronic equipments. Accordingly, design method will be changed greatly. In this paper, an 1 MHz resonant converter with fully compensated coreless isolation transformer is proposed, where the primary voltage is proportional to the secondary current and the primary current to the secondary voltage. 30 W prototype is constructed and tested, and its usefulness is verified.

Photopolymerization of Methyl Methacrylate with Primarty Aryl- and Alkylsilanes

  • 우희권;홍란영;양수연;박선희;송선정;함희석
    • Bulletin of the Korean Chemical Society
    • /
    • v.16 no.11
    • /
    • pp.1056-1059
    • /
    • 1995
  • The bulk photopolymerization of methyl methacrylate (MMA) with primary arylsilane (e.g., phenylsilane) and various primary alkylsilanes (e.g., benzylsilane, 3-phenoxyphenyl-1-silabutane, 3-naphthyl-1-silabutane, and 3-chlorophenyl-1-silabutane) was performed to produce poly(MMA)s containing the corresponding silyl moiety as an end group. It was found for the phenylsilane that while the polymerization yields increased and then decreased with a turning point at the molar ratio of MMA:silane=10:1 as the relative silane concentration increases, the polymer molecular weights decreased, and the TGA residue yields and the relative intensities of SiH IR stretching bands increased with increment of molar ratio of silane over MMA. The photopolymerization yield of MMA with the arylsilane was found to be higher than those with the alkylsilanes and without the silanes. Thus, the silanes seemed to significantly influence on the photopolymerization as both chain initiation and chain transfer agents.

Long-Term Survival after Wide Resection of Malignant Fibrous Histiocytoma of the Chest Wall

  • Shin, Jin Won;Chang, Yong Jin;Cho, Deog Gon;Choi, Si Young
    • Journal of Chest Surgery
    • /
    • v.52 no.1
    • /
    • pp.36-39
    • /
    • 2019
  • Primary malignant fibrous histiocytoma (MFH) of the chest wall is extremely rare and is characterized by aggressive features, including a high incidence of local recurrence and distant metastasis. Surgical resection of the chest wall is the primary modality of management. However, surgical treatment is not generally recommended in patients with evidence of distant metastasis. Here, we present a case of chest wall MFH along with a schwannoma mimicking distant metastasis in the right upper arm. The patient was treated by radical en bloc resection and survived for more than 9 years without recurrence.

Analysis of the Effect of a Resident-tailored Integrated health Promotion Program based on the Primary Health Care Post (보건진료소 중심의 주민 맞춤형 통합건강증진프로그램의 효과분석)

  • Im, Jung-Mi;Park, Hyeon-Hee;Jang, Soong-Nang
    • Journal of Korean Academy of Rural Health Nursing
    • /
    • v.10 no.2
    • /
    • pp.75-92
    • /
    • 2015
  • Purpose: The purpose of this study was to examine the effects of an integrated health promotion program provided by one community health post by comparing this program with more traditional health promotion programs provided by other institutions. Methods: The participants in this study were 110 selected local residents from I city. Of them, 55 residents participated in the integrated health promotion program in the community health post, and the other 55 participated in a program at another institution. SPSS 21.0 was used for descriptive analysis. Result: Scores for program effects, satisfaction level, quality of life related to health and depression were higher for the integrated health promotion program offered by the community health post compared to health promotion programs of the other institution. The differences were statistically significant. Conclusion: The findings of the study indicate that the integrated health promotion program can be helpful for community health posts in being successful in future plans to meet the needs of residents. Use of this program will also contribute to the development of community health posts but sustained research efforts need to be channeled into these programs.