Discordance in Spirometric Interpretations Based on Korean and Non-Korean Reference Equations

Nami Kim,Mi-Hee Park,Se-yeong Kim,Chunhui Suh,Sangyoon Lee,Kun-Hyung Kim,Chae-Kwan Lee,Dae-Hwan Kim,Jong-Tae Lee 대한직업환경의학회 2013 대한직업환경의학회지 Vol.25 No.-

Objectives: Korean regression models for spirometric reference values are different from those of other ethnic groups. The purpose of this study was to evaluate discordance in spirometric interpretations based on using Korean reference equations versus non-Korean reference equations. Methods: Spirometry was performed on 825 Korean male workers from April 2009 to November 2011. The spirometric patterns and disease severity were evaluated using two Korean equations (Choi’s and Lee’s) and three equations for Caucasians (NHANES III, Morris’s, and Knudson’s), and the results of Choi’s equation were compared with the non-Korean equations. The spirometric patterns were defined as normal, restrictive, and mild and moderate obstructive. Results: The mean differences in the FEV1% and FVC% between the two Korean equations were 2.0 ± 1.3% and 3.5 ± 2.2%, respectively. Morris’s equation had the greatest difference in the FEV1% from Choi’s equation: 32.9 ± 8.5%. Knudson’s equation had the greatest difference in the FVC% from Choi’s equation: 10.5 ± 6.5%. Conclusions: The two Korean equations shared similar characteristics of spirometric interpretation. The spirometric interpretations of Choi’s equation were significantly different from those of Morris’s equation and Knudson’s equation.

Bi계 고온 초전도체의 Flux Pinning Cener의 연구

이세종 慶星大學校 1998 論文集 Vol.19 No.1

It has been investigated the effect of excess amount of Ca and Cu on the formation of Bi-2223 superconducting phases. MgO particles are also added as flux pinning sites in the Bi based material and observe their effect on the superconducting properties. Heat treatment are varied to see the influence of the experimental factors in terms of temperature and duration time. Results are analyzed by the X-ray diffraction, SEM and measurements of superconducting properties including critical current density.

영구치의 맹출 장애에 관한 조사 연구

이종범,장철호,김종철,한세현,이상훈 대한소아치과학회 2007 大韓小兒齒科學會誌 Vol.34 No.1

맹출 중인 치아는 오랜 기간 동안 이동하는 과정에서 주위의 여러 요인들, 즉 유치의 조기 상실, 과잉치, 국소적 병소, 혀, 입술, 저작근, 외상 등에 의해서 다양한 영향을 받을 수 있다. 이러한 여러 요인들이 작용할 경우 치아의 정상적인 맹출 과정이 방해를 받게 되어 치아의 맹출 장애를 초래할 수 있다. 본 연구에서는 서울대학교 치과병원 소아치과에 2004년 1월 2일부터 2005년 12월 31일까지 신환으로 내원한 환자들, 총 8,010명의 주소를 분석하였고, 맹출 장애를 보이는 환자는 전체의 8.79%를 보였다. 맹출 장애의 유형은 맹출 지연이나 조기 맹출, 이소 맹출로 분류할 수 있었고, 맹출 지연이 가장 많이 나타난 치아는 상악 중절치이며, 조기 맹출이 호발한 치아는 하악 유중절치이고, 이소 맹출이 가장 많이 나타난 치아는 상악 제1대구치였다. Eruption disturbance is an abnormal state of eruption that occurs over a broad chronologic age range. There are many factors that influence eruption such as premature loss of primary teeth, supernumerary tooth, local disease, tongue, lip, mastication muscle and trauma. The purpose of this study was to determine the prevalence, patterns and tooth position that have eruption disturbance in children in Seoul, Korea. The subjects were 8,010 new patients who visited the department of Pediatric dentistry of Seoul National University Dental Hospital in 2004-2005. Clinical and radiographic records of the patients were reviewed by the primary investigator who is a pediatric dentist. Notable eruption disturbances included delayed eruption, early eruption and ectopic eruption and the prevalence of eruption disturbance was 8.79%.

탄소섬유와 석면을 보강한 시멘트 복합재료의 압축, 인장 및 휨 강도에 관한연구

이환홍,박종서,김광섭,노재성 忠南大學校 産業技術硏究所 1990 산업기술연구논문집 Vol.5 No.1

This study was carried out to examine the reducing ability of asbestos quantity added in asbestos reinforced cement composite(ARC). The using amount of asbestos is subject to restriction from 10-20 vol% to 5-10 vol%,because it is very harmful cancerogenic substance. Asbestos was replaced by pitch based isotropic carbon fiber, and then the mechanical properties, compressive, tensile and flexural strengths were tested as a function of mixing proportions. The results are as follows 1) The compressive strength of carbon fiber and asbestos reinforced cement composite(CFARC) was greater than ARC by superplasticizer, reducingW/C ratio to 20 percent. 2) The tensile strength of CFARC was showed increasing trend up to 52% compared to ARC at 5% carbon fiber volume fraction. 3) The flexural strength of CFARC was showed increasing trend up to 17% cowpared to ARC at 5% carbon fiber volume fraction.

DC 마그네트론 스퍼터법으로 제조한 ZnO:Al 투명 전도막의 특성

이세종,윤현우,김병섭,이성욱,박민우,곽동주 대한금속재료학회 2004 대한금속·재료학회지 Vol.42 No.9

Sputter-deposited Al-doped zinc oxide (ZnO:AI) is an attractive transparent conductive oxide material for application as transparent electrode in various electronic devices. In this work, the ZnO:AI films are prepared by the capacitively cooped DC magnetron sputtering on glass substrates and the influence of the substrate temperature and working gas pressure on the electrical, optical and morphological properties are investigated. We find that the ZnO:AI film with the optimum deposition parameters shows the resistivity of 0.96×10^(-3) Ω㎝ and the transmittance of average 90% in the wavelength range of the visible spectrum.

비복신경이식을 이용한 긴 거리의 말초신경 결손부 수복

이종호,이세영,김명진,이은진,안강민,김성민,최원재,명훈,황순정,서병무,최진영,정필훈 大韓顎顔面成形再建外科學會 2003 Maxillofacial Plastic Reconstructive Surgery Vol.25 No.2

The surgery of oral and maxillofacial area poses the risk of cranial nerve damage such as trigeminal nerve or facial nerve. Inferior alveolar nerve is prone to damage in the third molar extraction, implant installation, orthognathic surgery, open reduction and rigid fixation, and tumor ablation surgery. On the other hands,facial nerve is likely to be damaged or sacrificed with trauma or parotidectomy. In case of inferior alveolar nerve injury, the incidence is reported to be about 1.3%. The nerve function will almost recover in minimal damage, but it won't recover at last in total damage of a part of nerve unit. In latter cases, nerve regeneration in intended by allograft as nerve substitute or various route of merve condit. But the recovery with autograft is believed to be most relialbe mrthod in the rapair of long-span(longer than 15㎜)nerve defect. We have performed autologous sural nerve graft in the repair of nerve defect, which is caused by resection of benign or malignant tumor. Hereby we report the method of nerve harvesting, recovery of defected peripheral nerve and the complications of donor site with the discussion of sural nerve anatomy.

Al5계 다심복합선재의 Nb₃Sn 초전도상의 형성

이세종 경성대학교 생산기술연구소 1997 생산기술연구지 Vol.4 No.-

This study aims at the formation of superconducting Nb₃Sn phase by the bronze method in multifilamentary wires, and to observe the changes in the microstructure of the wires upon heattreatments for various times at 600℃∼800℃. SEM-EDX analysis are conducted to see the changes in the compositions of the elements of Nb, Sn and Cu in the microstructure of the wires. The formation of Nb₃Sn in the growing Nb₃Sn layer is very active at the beginning of heattreatment, but the growth of Nb₃Sn phase becomes slow in the later. It is revealed that the formation of Nb₃Sn layer is greatly influenced by the heattreating period and temperature. The ?? of the superconducting wire is measured to be around 15K after the heat-treatment.

不良 갯수의 分布에 대한 檢査過誤의 영향

李鍾盛,安世熙 강원대학교 산업기술연구소 1984 産業技術硏究 Vol.4 No.-

This paper presents a proof that b(r;n, ppd) is the appropriate distribution of the number of observed defects When inspector errors are present. And the effect of inspector errors on the probability of type 1 and type 2 errors is discussed.

협업 여과 기반의 교육용 컨텐츠 추천 시스템 설계

이용준,이세훈,왕창종 한국컴퓨터교육학회 2003 컴퓨터교육학회 논문지 Vol.6 No.2

협업여과는 흥미 있어하는 제품이나 개인화된 자료, 항목을 제공하기 의해 전체 집단의 의견을 반영하는 전자상거래에서 일반적으로 이용되는 기술이다. 협업여과는 정확하고 신뢰할 수 있는 도구로 입증되어 여러 분야의 전자상거래 영역에서 활용되고 있으나 아직까지 교육분야에는 한정적으로 적용되고 있다. 본 논문에서는 교육용 컨텐츠 추천에 사용자의 평가 점수를 이용하는 협업여과 방식의 추천시스템을 설계하였으며, 사용자 정보를 이용하여 추천의 정확도를 향상시키기 위한 유사도 보정기법을 도입하였다. 평균절대오차(MAE)와 반응자작용특성(ROC)값을 이용하여 제안한 시스템이 기존의 협업여과방식보다 추천 효율이 우수함을 검증하였다. Collaborative Filtering is a popular technology in electronic commerce, which adapt the opinions of entire communities to provide interesting products or personalized resources and items. It has been applied to many kinds of electronic commerce domain since Collaborative Filtering has proven an accurate and reliable tool. But educational application remain limited yet. We design collaborative filtering recommendation system using user's ratings in educational contents recommendation. Also We propose a method of similarity compensation using user's information for improvement of recommendation accuracy. The proposed method is more efficient than the traditional collaborative filtering method by experimental comparisons of mean absolute error(MAE) and reciever operating characteristics(ROC) values.

완전 고환성 여성화 증후군 1례

이원주,김택훈,권경익,김종인,조남규,박세출 啓明大學校 醫科大學 1993 계명의대학술지 Vol.12 No.2

저자들은 외형상 여성으로써 원발성 무월경과 양측 외음부 종양 촉지를 주소로 입원한 complete testicular feminization syncrome 1례를 경험하였기에 이를 문헌고찰과 함께 보고하는 바이다 The 46, XY individual with complete testicular feminization syndrome is a phenotypic female who is usually somewhat tall, has excellent breast development and presents to the gynecologist because of primary amenorrhea and an inguinal mass. In complete testicular feminization syndrome, axillary and pubic hair are sparse or absent and some degree of virilization such as clitorial hypertrophy, partial labioscrotal fusion and hirsutism doesn't occur at puberty. We report a case of complete testicular feminization syndrome with the brief review of literatures.