변량표준 추출간격을 이용한 DS X 관리도의 연구

이희춘 尙志大學校 生産技術硏究所 1997 生産技術論叢 Vol.3 No.-

The usal practice in using a control chart to monitor a process is to take samples of size n from the process every h hours, this article considers the properties of the double sampling ?? chartc when of each sampl depends on what is observed in the proceeding sample. This procedure offer better than statistical efficiency than the Shewhart ?? chart.

소화기 Behcet병: 13예의 임상분석

정희원,유빈,문희범,이인철,김병식,박건춘,김진천 대한대장항문학회 1995 Annals of Coloproctolgy Vol.11 No.1

공정관리에서 신경망을 이용한 X 관리도의 연구

이희준,지선수 尙志大學校 生産技術硏究所 1997 生産技術論叢 Vol.3 No.-

We propose the control chart to provide a more comprehensive scheme for detecting process mean shifts. In this papers, using the backpropagation, five samples are fed into the trained neural network to provide outputs ranging from -1 to 1. The main advantage of using neural network with control chart is that the neural network has almost no delay in detecting small and systematic patterns in the mean. Simulation results show that the performance of the proposed control chart using the neural network is quite promising.

朝鮮朝의 鄕校文庫에 관한 硏究

李春熙 韓國圖書館學會 1978 圖書館學 Vol.5 No.1

The libraries of the various learning institutes in the Yi Dynasty may be categorized into types: 1)The Hyang-Gyo library(the public school libraries in rural districts) 2)The Sabu-Hankdang library(the public school libraries in the Capital) 3)The Sowon library(the libraries of private learning institutes) 4)The Jyon-Gyong-Gak library(the library of the Sung Kyun Kwan which was the highest learning institute in the Yi Dynasty) For the historical study of Korean libraries as well as its education and culture the Hyang-Gyo libraries hold an very important position, but undeservedly its study has been neglected. In this paper, the writer made an effort to grasp the various function of the Hyang-gyo libraries with its historical background

시장품질 정보에 기초한 신뢰성 분석시스템 개발

이춘식,문덕희,김상부 國立 昌原大學校 産業技術硏究所 1997 産技硏論文集 Vol.11 No.-

The need for reliable products and reliability analysis became apparent in the age of customer satisfaction. To make products most attractive, first of all, customer complaints on current products must be gathered and analyzed. This article shows a case on the development of a reliability analysis system based on field data. Field data takes the form of A/S(After Sales Support) data. The characteristics of A/S data prohibit the exact calculation of theoretical reliability because of unavailibility of operating time and conditions. In this system, a reliability model was built by use of calendar time and field operating conditions. To estimate the reliability of products or failure modes, empirical distributions based on actuarial method were used and true distribution function could be fitted. And many functions needed to analyse reliability related data were implemented on personal computer via system analysis and design techniques.

Aggregate Packet Process having Pareto distribution as Source

이희춘,김주목 尙志大學校 生産技術硏究所 1998 生産技術論叢 Vol.6 No.-

독립적이며 같은 분포를 갖는 ON/OFF source를 갖는 패킷을 고려하자. ON/OFF source가 무한한 분산을 갖는 파레토분포일 때, 누적 패킷확률과정이 브라운 운동 ??와 경과된 시간 t에 대한 일차 결합 ???(t) 으로 표현된다. 이 때, 파레토 분포의 평균과 자체-유사 계수 H 에 의존되며 정하여지는 상수 a, b를 구하였다.

무증상의 후두개곡 낭종 환자에서 예기치 못한 어려운 기관내 삽관 1례

이상모,최준석,이철승,김원태,박천희 朝鮮大學校 附設 醫學硏究所 2007 The Medical Journal of Chosun University Vol.32 No.1

Although vallecular cyst is often asymptomatic and harmless to the patient, discovery of large vallecular cyst after induction of anesthesia is a potentially life-threatening problem for thepatient and provides for the anesthesiologist a challenge in airway management. We describe a case of difficult intubation where the laryngeal inlet was obscured by a large vallecular cyst that was discovered during induction of general anesthesia. A 47-year-old man presented for elective laparoscopic colecystectomy due to GB polyp. He had normal mouth opening and neck extension; no mass or distortions of the tongue or neck were observed. Anesthesia and paralysis were induced with 80 ㎎ propofol, alfentanil 0.5 ㎎, midazolam 2.0 ㎎ and rocuromum 50 ㎎. It was noted that ventilation of the lungs via mask was difficult. Despite insertion of an oropharyngeal airway, ventilation proved to be more difficult. Intubation was attempted. Direct laryngoscopy (Macintosh 3 blade) revealed a 3-4 ㎝ tranlucent cyst arising from the left vallecula. The cyst completely obscured the view of epiglottis and vocal cords, preventing intubation despite multiple attempts by three anesthesiologists. StafF anesthesiologist was aspirated cyst using a 16-guage needle, syringe and 20 ㎖ of serous fluid were aspirated from cyst. The epiglottis and vocal cord were then exposed and tracheal intubation was performed easily with a size 7.0 cuffed oral tracheal tube. Anesthesia and the operation then proceeded uneventfully, following laparoscopic colecystectomy, an ENT surgeon removed the cyst.

N-아세틸시스테인 투여후 발생한 급성 무기폐 : 증례보고

이광범,안용미,이철승,최준석,박천희 朝鮮大學校 附設 醫學硏究所 2009 The Medical Journal of Chosun University Vol.34 No.1

Causes of atelectasis under general anesthesia are tracheal foreign body, blood clot, aspiration of bronchial secretion, one-lung ventilation and relative predominance of parasympathetic system. N-acetylcysteine is mucolytic agent which improves the capability of sputum drainage. After administration of N-acetylcysteine, an increased volume of liquified bronchial secretions may occur. When cough is inadequate, the airway must be maintained open by mechanical suction. In case that is a mechanical block due to local accumulation, the airway should be cleared by endotracheal aspiration. A 49-year-old female was admitted for bilateral laparoscopic oophorectomy due to ovarian tumors. There was not any problem during a general anesthesia induction. After instillation of N-acetylcysteine into endotracheal tube, acute atelectasis was developed in right lower lung.

팔공산화강암과 주변 접촉변성암에 관한 암석학적 연구

이상원,이춘희,정증효 釜山大學校 師範大學 1996 교사교육연구 Vol.33 No.-

Palgongsan granite considered to be a rapid cooling shallow-level intrusion, exhibits textural and mineralogical changes from margin toward core. In petrochemistry it is characteristic of I-type granitoid representing calc-alkaline differentiation trend, which is discriminated active continental arc granitoid in tectonomagmatic environment. In Q-Ab-Or-An system norm compositions of the Palgongsan granite are plotted near low-temperature trough, and concentrated on the minimum melt curve (700℃). Palgongsan granite intruded and metamorphosed sedimentary rocks to hornfelses forming contact metamorphic aureoles (average 1.5 km width). Contact aureoles are divided into inner and outer zone, which are respectively biotite and chlorite zone, indicating albite-epidote hornfels facies. The mineral assemblages are chlorite-muscovite in chlorite zone and biotite-muscovite(-chlorite), epidote-chlorite, actinolite-chlorite and actinolite -epidote-chlorite in biotite zone. Metamorphic temperature is as low as to be estimated about 350℃ in chlorite zone and 400℃ or higher in biotite zone.

비심 카이제곱분포의 근사식의 개선에 관한 연구

이희춘 尙志大學校 1998 論文集 Vol.20 No.-

We are representing the equation of c???x'²by x²with degree of freedom n' and c???(x'²-b) by x²with degree of freedom n'. Also, approximation formulas of noncentral x'²can be represented by expansion method. The calculation of noncentral x'²is complicated when the degree of freedom is decimal point number. In this paper, we have attempted the numerical comparison of percentile points of the noncentral x'²with the correction term.