EWMA 기법을 적용한 CV 관리도의 개발

홍의표(Eui-Pyo Hong)․,강창욱(Chang-Wook Kang)․,백재원(Jae-Won Baek)․,강해운(Hae-Woon Kang) 한국산업경영시스템학회 2008 한국산업경영시스템학회지 Vol.31 No.4

The control chart is widely used statistical process control(SPC) tool that searches for assignable cause of variation and detects any change of process. Generally, ?맴詠? control chart and ?맴詠? are most frequently used. When the production run is short and process parameter changes frequently, it is difficult to monitor the process using traditional control charts. In such a case, the coefficient of variation (CV) is very useful for monitoring the process variability. The CV control chart is an effective tool to control the mean and variability of process simultaneously. The CV control chart, however, is not sensitive at small shift in the magnitude of CV. In this paper, we propose an CV-EWMA (exponentially weighted moving average) control chart which is effective in detecting a small shift of CV. Since the CV-EWMA control chart scheme can be viewed as a weighted average of all past and current CV values, it is very sensitive to small change of mean and variability of the process. We suggest the values of design parameters and show the results of the performance study of CV-EWMA control chart by the use of average run length (?℃꽃? ). When we compared the performance of CV-EWMA control chart with that of the CV control chart, we found that the CV-EWMA control chart gives longer in-control ARL and much shorter out-of-control ARL.

EWMA 기법을 적용한 CV 관리도의 개발

홍의표(Eui-Pyo Hong),강창욱(Chang-Wook Kang),백재원(Jae-Won Baek),강해운(Hae-Woon Kang) 한국산업경영시스템학회 2008 한국산업경영시스템학회 학술대회 Vol.2008 No.하계

The control chart is widely used statistical process control(SPC) tool that searches for assignable cause of variation and detects any change of process. Generally, R control chart and X-S are most frequently used. When the production run is short and process parameter changes frequently, it is difficult to monitor the process using traditional control charts. In such a case, the coefficient of variation (CV) is very useful for monitoring the process variability. The CV control chart is an effective tool to control the mean and variability of process simultaneously. The CV control chart, however, is not sensitive at small shift in the magnitude of CV. In this paper, we propose an CV-EWMA (exponentially weighted moving average) control chart which is effective in detecting a small shift of CV. Since the CV-EWMA control chart scheme can be viewed as a weighted average of all past and current CV values, it is very sensitive to small change of mean and variability of the process. We suggest the values of design parameters and show the results of the performance study of CV-EWMA control chart by the use of average run length(ARL). When we compared the performance of CV-EWMA control chart with that of the CV control chart, we found that the CV-EWMA control chart gives longer in-control ARL and much shorter out-of-control ARL.

FIR CV-EWMA 관리도

홍의표(Eui-Pyo Hong),강해운(Hae-Woon Kang),강창욱(Chang-Wook Kang),백재원(Jae-Won Baek) 한국산업경영시스템학회 2010 한국산업경영시스템학회 학술대회 Vol.2 No.-

When the production run is short and process parameters change frequently, it is difficult to monitor the process using traditional control charts. In such a case, the coefficient of variation (CV) is very useful for monitoring the process variability. The CV control chart is an effective tool to control the mean and variability of process simultaneously. The CV control chart, however, is not sensitive at small shifts in the magnitude of CV. The CV-EWMA(exponentially weighted moving average) control chart which was developed recently is effective in detecting a small shifts of CV. Since the CV-EWMA control chart scheme can be viewed as a weighted average of all past and current CV values, it is very sensitive to small change of mean and variability of the process. In this paper, we propose an FIR(Fast initial response) CV-EWMA control chart to improve the sensitivity of a CV-EWMA scheme at process start-up or out-of-control process. Moreover, we suggest the values of design parameters and show the results of the performance study of FIR CV-EWMA control chart by the use of average run length(ARL). Also, we compared the performance of FIR CV-EWMA control chart with that of the CV-EWMA control chart and we found that the CV-EWMA control chart gives longer in-control ARL and much shorter out-of-control ARL.

재 제조시스템의 가용도 분석모델과 평가척도

백재원(Jae Won Baik),강해운(Hae Woon Kang),강창욱(Chang Wook Kang),홍의표(Eui Pyo Hong) Korean Society for Precision Engineering 2010 한국정밀공학회지 Vol.27 No.2

FIR을 이용한 CV-CUSUM 관리도의 통계적 설계

이정훈 ( Jung Hoon Lee ),강해운 ( Hae Woon Kang ),홍의표 ( Eui Pyo Hong ),강창욱 ( Chang Wook Kang ) 한국품질경영학회 2010 품질경영학회지 Vol.38 No.3

The coefficient of variation represents the ratio of the standard deviation to the mean, and it is a useful statistic for comparing the degree of variation from one data series to another, even if the means are drastically different from each other. Recently, the CV control chart is developed for monitoring processes in such situations. However, the CV control chart has low performance in detecting small shift. Due to the development of equipment and technique, currently, small shift of process occurs more frequently than large shift. In this paper, we proposes the CV-CUSUM control chart using CUSUM scheme which is cumulative sum of the deviations between each data point and a target value to detect a small shift in the process. We also found that the FIR(fast initial response) CUSUM control chart is especially valuable at start-up or after a CV-CUSUM control chart has signaled out-of-control.

학술 7 특별구두세션 : PA. 포스터세션 1 ; 평면 디스플레이 휘도균일도 관리를 위한 MMR 관리도 설계

이성근 ( Sun Geun Lee ),강창욱 ( Chang Wook Kang ),홍의표 ( Eui Pyo Hong ) 한국품질경영학회 2014 한국품질경영학회 학술대회 Vol.2014 No.2

1. 목적 · 평판 디스플레이의 휘도 균일도를 평가하는 Min-Max Ratio(MMR)의 분포를 유도하고 공정을 관리할 수 있는 방법론을 제안함. 2. 연구설계/ 방법론/ 접근방법 · 평판디스플레이의 휘도 균일도를 평가할 수 있는 척도인 MMR의 근사적인 확률분포를 유도하고 이를 이용하여 휘도 균일도를 실시간으로 모니터링하고 관리하기 위한 MMR 관리도를 통계적으로 설계. · MMR 관리도의 설계에 필요한 표본의 크기와 관리한계선 조정상수 L의 다양한 조합을 제시. 3. 연구결과 · 평판디스플레이(FPD) 제조공정에서 휘도 균일도를 평가하는 MMR의 분포 및 중요 Parameter 추정 방법 제안. 4. 실무적 시사점 · 평판디스플레이의 휘도와 관련된 공정의 관리상태에 따른 MMR 관리도의 적용가이드라인을 제시. 5. 독창성/ 가치 · 휘도 균일도는 평판디스플레이의 품질을 결정하는 중요 품질특성치이기 때문에 휘도 균일도를 모니터링하고 관리하기 위한 공정관리기법에 대한 연구는 매우 중요함. 본 연구에서는 VESA의 FPDM 표준에서 정의된 휘도 균일도 지표의 근사적 확률분포를 유도한 후 이를 이용하여 휘도 균일도를 모니터링 및 관리하기 위한 MMR 관리도를 제안하고 그 수행도를 분석함.

한국 소나무림의 입지환경과 임분구조

권기철 ( Ki Cheol Kwon ),한성안 ( Sung An Han ),이돈구 ( Don Koo Lee ),정인권 ( In Kwon Jung ),서용진 ( Yong Jin Seo ),홍의표 ( Eui Pyo Hong ),최환석 ( Hwan Suk Choi ) 한국산림과학회 2021 한국산림과학회지 Vol.110 No.4

소나무는 우리나라 자생수종 중 모든 지역에서 가장 넓은 분포를 보이고 있다. 소나무림의 입지환경 및 임분구조 특성을 구명하기 위해 제7차 국가산림자원조사(2016년∼2020년)를 수행하며 얻은 자료를 활용하여 흉고단면적 기준으로 소나무가 50% 이상인 조사구를 대상으로 분석하였다. 총 15,139개 표본점 중 소나무림으로 분류된 원형조사구(400 ㎡) 수는 3,665개소이다. 소나무림은 해발 600 m 이하의 낮은 지역의 산림에서 가장 많이 나타났다(평균 출현율 25%). 해발 800 m 이상에서는 주로 남사면과 서사면에 분포했고(57%), 해발고가 낮은 지역에서는 모든 사면에 분포하는 경향을 보였다. 소나무림의 토성은 대부분 사양토(33%), 양토(29%), 미사질양토(24%)였고, 양분 수준은 다소 척박했다. 소나무와 함께 중요도가 높게 나타난 수종은 신갈나무, 굴참나무, 졸참나무, 잔털벚나무, 밤나무 등의 순이었다. 소나무, 곰솔, 리기다소나무 등은 소나무림에서 대경급으로 많이 분포하고 있었다. 신갈나무, 굴참나무, 졸참나무, 떡갈나무, 물푸레나무 등은 중경급의 주요 수종이며, 노간주나무와 때죽나무는 소경급으로 많이 분포하고 있었다. 소나무림에서 하층을 주로 점유하는 수종은 진달래, 졸참나무, 생강나무, 쇠물푸레나무, 개옻나무, 철쭉 등의 순으로 나타났다. Pinus densiflora is an essential tree species native to the Republic of Korea (ROK) and covers most of the total natural forest areas in the ROK. This study was conducted to understand the site characteristics and stand structure of P. densiflora forests distributed at sites where P. densiflora covered over 50% of the stand basal area during the 7th National Forest Inventory (NFI) period from 2016 to 2020. P. densiflora dominated 3,665 circular sample plots (400 ㎡). P. densiflora forests predominated at elevations less than 600 m above sea level (a.s.l). However, most P. densiflora forests were distributed at the slopes facing south and west over 800 m a.s.l. At altitudes below 800 m, they were distributed at all slopes but dominated at the southern and western slopes. P. densiflora grew mainly in the soils of sandy loam, loam, or silt loam with relative infertility. Dominant tree species distributed with P. densiflora were Quercus mongolica, Q. variabilis, Q. serrata, Prunus serrulata var. pubescens and Castanea crenata by the descending order. P. densiflora, P. thunbergii, and P. rigida were grown in large DBH classes, Quercus species and Fraxinus rhynchophylla in middle DBH classes, while Juniperus rigida and Styrax japonicus in small DBH classes. Dominant tree species distributed mainly at the lower layer of P. densiflora stands were Rhododendron mucronulatum, Q. serrata, Lindera obtusiloba, Fraxinus sieboldiana, Toxicodendron trichocarpum and Rhododendron schlippenbachii by the descending order.

金東仁 小說 硏究

洪義杓 진주여자전문대학 1990 論文集 Vol.12 No.-

This is a study on 'Baetaragi', Kim Dong-In's novel. The first, its plot is a kind of frame-story. It has three frames. They are the outer story, the inner story and the inner main story. The inner main story is the most important part in the novel. At the beginning the outer story is introducted. And the inner story, which connects the outer story and the inner main story, is unfolded. The second, time in this novel consists of two parallel axes of time. One is time of fiction and the other is time of narration. In this novel, time of narration progresses in order for one year. On the other hand, the inner main story is composed of the story in the past and the outer one is composed of the story in the present. The third, the writer takes advantage of the technique of description which appeals to the readers' sensory organ. Especially he appeals to the organ of vision. And he really describes the mental state of the characters well by using sensual description and the dialect.

합천 지역어 연구 (Ⅰ) : 마을 이름을 중심으로 Centering on village names

홍의표,문병우 진주여자전문대학 1995 論文集 Vol.18 No.-

In this thesis I have investigated the property of a vocabulery morphology, and phonology represented in the village name which it being used at present from synchronic point of view and have researched with a to tracing a proper language which remains. The result is as follows. 1 First of all, I have investigated an etymology, distribuyion, a meaning cateory and so on etracting twenty kinds or so from the latter elements represented in the village name at habch'on area. The latter elements are divided into what is exclusively used temporarily from a general word and what is used as a latter element and though it is exclusively used from a genera word, Only base from comes out in a general word and an allomorphy is used only as the latter element in a place-name. 1) The temporarily exclusive use from a general word. -ku˘ri, -kol, -mog, -pawi, -nae, chngo˘, -t'o˘, -tu˘l, -pat', -san, -mit' 2) The latter element use in a place name. -tam, -ttu˘m, -mal, -sil, -choˇm, -kae, -ma, -tal, -mi 3) The exclusive use from a general suffix. -i 4) Seen from diachromic point of view, -tal, -tam, -sil and dhat not were originally a free from but lost thir self-reliamce to become bard into a bound from and come out as a latter element in a place-name. 2. There are many case the latter element in a place-name is expanded extensively to be used exclusively as a village-name, a main meaning and a topogra phical name which has flexibility rather tharn it is limitedly used as a main meaning. -ko˘ri, -kol, -pawi, -i, -cho˘ng, -t'oˇ ete apply to this case as a latter element. 3. I have thought that it is glad to derive an old form of lexical element from our proper village names gradually wearing out by the social change and living environment. Basic lexical elements used in the place names disuppear by degrees, and they now seems to be little adopted when new place names are given. chash, t'ung, ha kal, sil and tal. And besides, I could find 'tarari', one of the place names in ssangch'aeg myoˇn. I wonder whether this word show that this area is 'tara-nation'. I think that much yet remains to be studied and examined. 4. In morphological consideration, I analyzed the morphemes of village names, dividing them into M1+M2 and Ml+M2+M3, extracting many word-constructions according to the combination of immediate constituents. In particular, it is noticed that the word-construction [N+V] (mul+koˇnnoˇ) come out in place names. 5. In phonological consideration, I classified the phonological phenomenon in village names into consonant varialile and vowel variable : assimilation, deletion, and palatalization in consonant variable, and deletion, Umlaut phenomenon, monophthong, and adhesion phenomenon of 'i'vowel variable.

朴木月 詩 硏究 : 話者와 聽者의 關係類型을 중심으로

洪義杓 진주여자전문대학 1993 論文集 Vol.16 No.-

This is a Study on Mogwol's poetry. First, in his early 36 poems speaker and hearer do not appear in 22(61%) and only speaker appears in 11 poems(31%). And both speaker and hearer appear in 3 poems. Second, in the middle period of his poetry it shows the opposite phenomena. In his middle 103 poems speaker only appears in 70 poems(68%), and neither speaker nor hearer appears in 25 poems(24%) and both speaker and hearer appear in 8 poems(8%). Third, in his late 279 poems speaker alone appears in 199 poems(71%). Both speaker and hearer appear in 69 poems(25%) and neither speaker nor hearer appears in 11 poems(4%). Thus, the rate that speaker alone appears is increasing from 31% in the early poems via 68% in the middle poems to 71% in the late poems. Therefore Mogwol's poetry is speaker-oriented and represents speaker himself through consciousness. So most of thorn have lyrical form which represents the style of speaking himself.