성능변수와 대용변수를 이용한 3단계 X 관리도의경제적 설계

곽신석,이주호 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4

Purpose: Two-stage X chart is a useful tool for process control when a surrogate variable may be used together with a performance variable. This paper extends the two-stage X chart to a three stage version by decomposing the first stage into the preliminary stage and the main stage. Methods: The expected cost function is derived using Markov-chain approach. The optimal designs are found for numerical examples using a genetic algorithm combined with a pattern search algorithm and compared to those of the two-stage X chart. Sensitivity analysis is performed to see the parameter effects. Results: The proposed design outperforms the optimal design of the two-stage X chart in terms of the expected cost per unit time unless the correlation between the performance and surrogate variables is modest and the shift in process mean is smallish. Conclusion: Three-stage X chart may be a useful alternative to the two-stage X chart especially when the correlation between the performance and surrogate variables is relatively high and the shift in process mean is on the small side.

성능변수와 대용변수를 이용한 3단계 $\bar{X}$ 관리도의 경제적 설계

곽신석,이주호,Kwak, Shin-Seok,Lee, Jooho 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4

Purpose: Two-stage ${\bar{X}}$ chart is a useful tool for process control when a surrogate variable may be used together with a performance variable. This paper extends the two-stage ${\bar{X}}$ chart to a three stage version by decomposing the first stage into the preliminary stage and the main stage. Methods: The expected cost function is derived using Markov-chain approach. The optimal designs are found for numerical examples using a genetic algorithm combined with a pattern search algorithm and compared to those of the two-stage ${\bar{X}}$ chart. Sensitivity analysis is performed to see the parameter effects. Results: The proposed design outperforms the optimal design of the two-stage ${\bar{X}}$ chart in terms of the expected cost per unit time unless the correlation between the performance and surrogate variables is modest and the shift in process mean is smallish. Conclusion: Three-stage ${\bar{X}}$ chart may be a useful alternative to the two-stage ${\bar{X}}$ chart especially when the correlation between the performance and surrogate variables is relatively high and the shift in process mean is on the small side.

성능변수와 대용변수를 이용한 3단계 □ 관리도의 경제적 설계

곽신석 ( Shin-seok Kwak ),이주호 ( Jooho Lee ) 한국품질경영학회 2016 품질경영학회지 Vol.44 No.4

Purpose: Two-stage □ chart is a useful tool for process control when a surrogate variable may be used together with a performance variable. This paper extends the two-stage □ chart to a three stage version by decomposing the first stage into the preliminary stage and the main stage. Methods: The expected cost function is derived using Markov-chain approach. The optimal designs are found for numerical examples using a genetic algorithm combined with a pattern search algorithm and compared to those of the two-stage □ chart. Sensitivity analysis is performed to see the parameter effects. Results: The proposed design outperforms the optimal design of the two-stage  chart in terms of the expected cost per unit time unless the correlation between the performance and surrogate variables is modest and the shift in process mean is smallish. Conclusion: Three-stage □ chart may be a useful alternative to the two-stage □ chart especially when the correlation between the performance and surrogate variables is relatively high and the shift in process mean is on the small side.

돼지의 Leptospira 속균(屬菌)에 대한 혈중항체조사(血中抗體調査) -제천시(堤川市) 소재(所在) 도축장(屠畜場), 출하돈(出荷豚) 중심(中心)-

강신석 ( Shin Seok Kang ),곽학구 ( Hak Koo Kwak ),김홍기 ( Hong Gye Kim ) 한국가축위생학회 1992 韓國家畜衛生學會誌 Vol.15 No.1

This experiment was to investigate the Leptospiral antibody in the pigs with the serological test by the microscopic-agglutination-test(MAT) from November 1991. to Januaury 1992. Antigen(living antigen) was used L. icterohemorrhagiae, L. pomona, L. canicola, L. hardjo, L. ballum, L. australis, L. autumnalis, L. grippotyphosa, L. tarassovi, L. pyrogenes, L. bataviae, L. hebdomadis for the serolgical test in the pigs. The result obtained are summarized as follows: of the total 202 serum samples examined, 1. Among the serum samples of 202 heads, 19 heads of the pigs(9.4%) were positive. 2. Among the positive samples of 19 heads, The detected were L. icterohemorhagiae 10 heads(5.0%), L. pomona 3 heads(1.5%), L. canicola 6 heads(3.0%). 3. Antibody titers of positive sera were ranging from 1: 100 to 1: 400. Serotiters appeared to be very low. 4. The seroprevalence of Leptospira in Chechon was higher than that other districts(5.4%-5.8%), but the lower than Chung-nam, Kyonggi(13.7-15.9%).

모돈에서의 Leptospira속균에 대한 혈중항체조사

강신석 ( Shin Seok Kang ),곽학구 ( Hak Koo Kwak ),김홍구 ( Hong Ki Kim ) 한국가축위생학회 1993 韓國家畜衛生學會誌 Vol.16 No.1

A serological survey was conducted to detect the type of Leptospirosis in sows. Antigen(live antigen) tested were L.icterohemorrhagiae, L.pomonal, L.canicola, L.Hardjo, L.australis, L.autumnalis, L.grippotyphosa, L.pyrogens, L.bataviae, L.hebdomadis. The survey was performed from June 1992 to December 1992 by microscopic-agglutination test. The results were as follows. 1. Among the serum samples of 92 heads of the sows, 6 heads of the sow(6.5%) were positive. 2. Among the positive samples of 6 heads, L.icterihemorrhagiae were 4 heads(4.3%) and L.pomona 2 heads (2.2%), respectively. 3. Antibody titers of positive sera were ranging from 1:200 to 1:1600. 4. The seroprevalence of leptospira in Chechon city, Chechon county, Danyang county that Chechon county(3.3%) was higher than that of other districts(1%-2.2%).

1인 가구와 2인 이상 가구의 문화소비지출 추세비교 분석

박근화,김지학,곽신석,이충희 한국자료분석학회 2015 Journal of the Korean Data Analysis Society Vol.17 No.5

As the result of increasing one-person household, the figure reached 23.9% in 2010 and is expected to rise up to 31.3% by 2025. Although many studies on expenditure of one-person households have been conducted, there is very little research on cultural expenditure. In this paper, we extract 46 relating items from culture, sports and tourism classification out of the household survey issued by National Statistical Office and reclassified them into 12 categories. In order to compare difference on cultural expenditure between one-person households and two or more person households, we use the independent sample t-test. The homogeneity of trends of the two groups is analysed by Van Belle and Hughes's test. Expenditure of cultural consumption by the individual shows growing tendency with exceptions in the picture & audio and the publishing categories. One-person households spend more only on cultural service while two or more person households show higher expenditure on the others. We find homogeneity for 12 month of all 12 categories from the results of Van Belle and Hughes's test. Five categories including the cultural service show linearly increasing trends, whereas the publishing shows decreasing trend. The comparison on the other categories between two groups shows different trends. 1인 가구의 증가추세에 따라 2010년에는 23.9%로 증가하였고, 2025년에는 31.3%로 증가할 것으로 전망되고 있다. 따라서 1인 가구의 소비지출에 대한 많은 연구가 진행되어왔다. 그러나 문화 관련 1인 가구의 소비지출에 대한 연구는 거의 없는 실정이다. 본 논문에서는 통계청에서 발표하는 가계동향조사 품목 중 문화체육관광 분류체계로 46개 품목을 선정한 후 이를 다시 12개의 분야로 구분하였다. 1인가구와 2인 이상 가구의 문화관련 가계소비지출 차이를 비교하고 변화와 차이를 파악하고자 독립표본 t-test를 이용하여 횡단면적인 분석을 하였고, 계절 Kendall 분석과 Van Belle and Hughes의 추세의 동질성 검정을 이용하여 12개 각 분야의 시계열 추세 및 추세에 대한 동질성 검정을 함으로써 해당기간의 비교뿐만 아니라 시계열의 추세의 비교도 할 수 있도록 하였다. 추세분석은 2006년 1월부터 2014년 12월까지의 월별자료를 이용하였다. 문화 관련 1인당 소비지출에서는 영상음향과 출판 분야를 제외하고는 대체적으로 증가하였고, 문화서비스 분야만이 1인 가구의 소비지출이 더 많을 뿐 대부분 문화 관련 1인당 소비지출은 2인 이상 가구에서 높게 나타났다. 추세의 동질성 검정에서는 12개 분야 모두에서 12계절에 대한 추세가 각각 동질적인 것으로 나타났다. 문화서비스 등 5개 분야는 선형적으로 증가하는 추세가 있으며, 출판은 감소 추세가 있는 것으로 나타났고, 그 외는 두 집단 간의 추세가 상이한 것으로 나타났다.

[특집ㅣ약액주입 및 고화처리기술(Ⅱ)] 약액주입 및 고화처리기술

김진춘,김경민,곽신석 한국지반환경공학회 2002 지반환경 Vol.3 No.2

말기 신부전증 환자의 유지투석 시작 직전의 신성 골이영양증

신규태,마경애,신석균,구성현,김흥수,곽연식,하성규,D . J . Sherrard,김도현 대한신장학회 1997 춘계학술대회 초록집 Vol.1997 No.-

[특집1ㅣ약액주입 및 고화처리기술] 약액주입 및 고화처리기술

김진춘,김경민,곽신석 한국지반환경공학회 2002 지반환경 Vol.2 No.4

무선인식시스템의 데이터 충돌 방지에 관한 연구

강민수(Khang Min-Soo),신석균(Shin Suk-Kwn),백선기(Baek Sun-Ki),박면규(Park Myeon-gyu),곽칠성(Kwha Chil-Seoung),이기서(Lee Key-Seo) 한국철도학회 2002 한국철도학회 학술발표대회논문집 Vol.- No.-

In this paper, it is proposed instruction code satisfied algorithm that is able to prevent data collision when transponder access in the area of recognition system that is operated to single channel. Differ from absolute collision is used to in the time domain procedure, instruction code satisfied algorithm, transmits data which don"t generate collision and must satisfy instruction code. So, to prevent data collision, transponder is of great if it read the entire instruction code. Consequently, it is applied to algorithm that made the system of wireless recognition 13.56Mhz. As a result, for the time of one bit data transmission had 14㎲ difference, it is proved the prevention of data loss in experiment.