• Korean Journal of Acupuncture
• /
• 제40권3호
• /
• pp.99-108
• /
• 2023

Objectives : The aim of this study was to assess the quantitative characteristics of pressure pain threshold (PPT) and pressure depth (PD) at the abdominal conception vessel (CV) acupoints according to subjective digestive status and digestive discomfort levels, accomplished by comparing a large group of healthy men and women, using the modified digital algometer. Methods : A total of 1,504 healthy adults aged 19 years or older participated in this study. A questionnaire was administered to evaluate participants' digestive status and discomfort. PPT (kgf/cm²/s) and PD (mm) measurements were obtained at CV14, CV12, and CV4 acupoints using a modified digital algometer. General characteristics were analyzed using the chi-square test, and differences in PPT and PD were assessed using two-sample t-tests and ANCOVA. Results : Significant difference in PPT was found based on digestive status at CV14 and CV12 for both sexes, and in PD at CV14 for women. Women exhibited significant difference in PPT based on digestive discomfort at CV14, CV12, and CV4, while men showed significant difference at CV14 and CV12. Significant difference in PD was observed at CV14 and CV4 among women. Even after adjusting for age and body mass index, significant difference persisted in PPT based on digestive discomfort at CV14 and CV12 for both sexes. PD exhibited significant differences at CV14, CV12, and CV4 among women. Conclusions : Using the modified digital algometer, this study showed the significant difference of pressure pain threshold at the CV14 and CV12 acupoints for subjective digestive discomfort levels in healthy men and women.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 1994년도 춘계학술대회 논문집
• /
• pp.46-49
• /
• 1994

In order to investigate possibility of CV cable diagnosis technique, residual insulation characteristics of .long - term serviced 0.6 kV CV Cable are examined by DC leakage current residual voltage tensile strength, cross1inking density and AC & impulse breakdown. Also effect of cable structure and water tree are reported

• 산업경영시스템학회지
• /
• 제29권2호
• /
• pp.97-103
• /
• 2006

Recently, the control chart is developed for monitoring processes with normal short production runs by the coefficient of variation(CV) characteristic for a normal distribution. This control chart does not work well in non-normal short production runs. And most of industrial processes are known to follow the non-normal distribution. Therefore, the control chart is required to be developed for monitoring the processes with non-normal short production runs by the CV characteristics for a non-normal distribution. In this paper, we suggest the control chart for monitoring the processes with a gamma short runs by the CV characteristics for a gamma distribution. This control chart is denoted by the gamma CV control chart. Futhermore evaluated the performance of the gamma CV control chart by average run length(ARL).

• 한국환경농학회지
• /
• 제33권4호
• /
• pp.321-326
• /
• 2014

최근 기상재해가 빈번하게 발생하고 있다. 우박이나 태풍은 감자의 안정적이 재배에 위협적인 요인이다. 이렇듯 돌발적인 기상재해에 감자를 안정적으로 재배하는 것은 중요하다. 따라서 본 연구는 감자품종별 감자 줄기 특성이 우박에 대한 저항성은 어떠한 관계가 있는지 구명하기 위하여 수행되었다. 부러진 줄기의 비율에서 '대서' 품종은 5%, '고운' 품종은 30%, '새봉' 품종은 26%였다. '대서' 품종은 다른 품종에 비하여 우박에 의한 피해가 가장 적었다. 줄기의 물리적 특성을 측정한 결과 '대서' 품종이 높았다. '대서' 품종의 줄기의 직경은 15mm, '고운' 품종은 13mm, '새봉' 품종은 11 mm 이었다. '대서' 품종의 줄기 경도는 평균 74 N, '고운'품종은 71 N, '새봉' 품종은 59 N 이었다. 우박 피해 당시 토양피복도는 '대서' 품종이 79%의 피복도로 가장 높았고, '고운' 품종은 56% 정도로 가장 적었다, '새봉' 품종은 73%였다. 파종 후 90일째 조사한 수량성은 '대서'가 40 MT/ha '고운'은 30 MT/ha '새봉'은 36 MT/ha이었다.

• 한국전기전자재료학회:학술대회논문집
• /
• 한국전기전자재료학회 2001년도 하계학술대회 논문집
• /
• pp.601-604
• /
• 2001

22.9 kV CV power cable is very important factor of underground distribution power line. Cyclic aging for 14days is performed to remove a large amount of the volatiles found in freshly manufactured cable. In this paper, we examined AC breakdown characteristics of CV power cable before and after cyclic aging for 14days. As the result, even if there were some exceptions, the AC breakdown voltage before aging was lower than that after aging, but most of the results were that the AC breakdown voltage after aging was lower than that before aging.

• 한국주조공학회지
• /
• 제5권3호
• /
• pp.5-12
• /
• 1985

Many researchers have studied the eutectic solidification of CV Graphite Cast Iron qualitatively. However quantative studies have not been done. The type of eutectic solidification of CV Graphite Cast Iron treated with CG Alloy (Fe-Si-Mg-5Ti-Ca-Ce) was studied quantitatively through M.D.E. value (Mushy Degree of Eutectic Solidification) = $t_2/t_1)$, where $t_1$ is the difference of the eutectic solidification starting time between surface and center part of the casting sample, and $t_2$ is the time of eutectic solidification of the center part. Following results were obtained. (1) The M.D.E. value of CV graphite cast iron lies between that of spheroidal graphite and that of flake graphite cast iron but is closer to that of Flake graphite cast iron. (2) The M.D.E. value of CV graphite cast iron depends upon CV ratio. (3) The time required for eutectic solidification increases as graphite form is changed from Flake, CV. to spheroidal graphite. (4) The M.D.E. value increases as cooling rate increases.

• International Journal of Automotive Technology
• /
• 제8권6호
• /
• pp.723-730
• /
• 2007

The typical design of automotive driveshafts generally utilizes Constant Velocity(CV) joints as a solution to NVH. CV joints are an integral part of vehicles and significantly affect steering, suspension, and vehicle vibration comfort levels. Thus, CV joints have been favored over universal joints due to the constant velocity torque transfer and plunging capability. Although CV joints are common in vehicle applications, current research works on modeling CV joint friction and assumes constant empirical friction coefficient values. However, such models are long known to be inaccurate, especially under dynamic conditions, which is the case for CV joints. In this paper, an instrumented advanced CV joint friction apparatus was developed to measure the internal friction behavior of CV joints using actual tripod-type joint assemblies. The setup is capable of measuring key performance of friction under different realistic operating conditions of oscillatory speeds, torque and joint installation angles. The apparatus incorporates a custom-installed triaxial force sensor inside of the joint to measure the internal CV joint forces(including friction). Using the designed test setup, the intrinsic interfacial parameters of CV joints were investigated in order to understand their contact and friction mechanisms. The results provide a better understanding of CV joint friction characteristics in developing improved automotive driveshafts.

• 한국수소및신에너지학회논문집
• /
• 제35권4호
• /
• pp.363-369
• /
• 2024

Needle valves are instrumentation devices with quick-opening inherent flow characteristics, used in pipelines requiring rapid flow supply immediately upon opening the flow path. For needle valves applied in liquefied hydrogen plants operating in cryogenic environments, it is necessary from the initial design stage to have various inherent flow characteristics in addition to quick-opening, depending on the intended usage. In this study, the inherent flow characteristics of a 1/2'' liquid hydrogen needle valve were evaluated through computational fluid dynamics analysis. Disk shapes exhibiting various inherent flow characteristics were proposed by deriving the flow coefficient (Cv) according to changes in disk shapes. Among the disk shapes that directly affect the Cv, the disk length and slope angle were selected, and case studies were conducted with nine parameter combinations. From the results of the normalized Cv regarding to opening rates, disk lengths and slope angles exhibiting quick-opening, equal-percentage, and linear inherent flow characteristics were determined.

• 대한한의학원전학회지
• /
• 제28권4호
• /
• pp.121-137
• /
• 2015

Objectives : To investigate the progress, characteristics, and reasons of CV12 moxibustion that King Sukjong of Joseon Dynasty had experienced 31 years since 1684. Methods : This study mainly extracted the records and related records about CV12 moxibustion of King Sukjong and relevant records from Seungjeongwon Ilgi, and analyzed them. Aside from that, medical books wrote at that time and relevant records were additionally investigated. Results : King Sukjong cauterized CV12 or other CV12 related acupoints with moxa 21 years out of his 31 years from 1684 to 1714. The cautery period was usually between late January and mid February. He had 100 pieces of moxa for cautery. On the last day of his moxibustion, he cauterized ST36 with moxa. The moxibustion process consisted of the following steps: suggestion or requirement of moxibustion, decision of date and time, and moxa cautery. In 1684, the reason why King Sukjong cauterized CV12 with moxa was to treat his joint pain and nauseous symptoms. The effect can be found in Donguibogam, many other Korean medical books, and other general books at that time. In 1685, he began to cauterize CV12 with moxa to prevent diseases. Since then, most moxa cautery on CV12 had been performed in the same context. Conclusions : For 21 years, King Sukjong repeatedly cauterized CV12 with moxa. The moxa therapy was conducted to prevent diseases mostly. And King Sukjong had a lot of interest in the therapy. For the reasons, the therapy had repeatedly been performed so long.

• 융합보안논문지
• /
• 제8권2호
• /
• pp.63-70
• /
• 2008

최근 발생하는 다양한 악성 프로그램을 분석해 보면, 해당 악성 프로그램을 쉽게 분석할 수 없도록 하기 위해 다양한 분석 방해 기법들이 적용되고 있다. 그러나, 분석 방해 기법들이 적용될수록, 악성프로그램의 PE파일 헤더에는 정상적인 일반 PE파일의 헤더와는 다른 특징이 더 많이 나타난다. 본 논문에서는 이를 이용하여 악성 프로그램을 탐지할 수 있는 방법을 제안하고자 한다. 이를 위해, PE파일 헤더의 특징을 표현할 수 있는 특징 벡터(Characteristic Vector, CV)를 정의하고, 정상 실행 파일의 특징 벡터의 평균(ACVN)과 악성 실행 파일의 특징 벡터의 평균(ACVM)을 사전 학습을 통해 추출한다. 이후, 임의 파일의 특징 벡터와 ACVN, ACVM간의 Weighted Euclidean Distance(WED)를 계산하고, 이를 기반으로 해당 파일이 정상파일인지 혹은 악성 실행 파일인지를 판단하는 기술을 제안한다.