소아에서 수면호흡장애로 인한 삶의 질과 인성 및 행동장애와의 관계

최지훈,이상학,이흥만,이정규,권순영,신철,이승훈 대한이비인후과학회 2005 대한이비인후과학회지 두경부외과학 Vol.48 No.10

Background and Objectives:Sleep disordered breathing (SDB) in children can have an effect on the quality of life as it may produce sleep disturbance, physical symptoms, and emotional distress in daytime function. It may also lead to the change of children’s personality and behavior. We aimed to estimate the impact of SDB in children on the quality of life and the correlation between the quality of life and personality or behavioral problem. Subjects and Method:A total of 116 children aged 4 through 15 years old (M:79, F:37) with symptoms of snoring, mouth breathing, sleep apnea and physical examination results demonstrating tonsillar size of 3+ or greater were included. Two standard questionnaires, K-CBCL (Korean Child Behavior Checklist) and KPI-C (Korean Personality Inventory for Children) were used for evaluation of personality and behavior in children, and then a clinical analysis was carried out by pediatric psychologist for interpretation. To evaluate the quality of life in children, two other standard questionnaires, KOSA-18 (Korean Obstructive Sleep Apnea-18 Survey) and KOSA-6 (Korean Obstructive Sleep Apnea-6 Survey), were given to the parents of the children to complete. Results:There was a significant correlation between the KOSA-18 score and the K-CBCL total problem behavior T score, the mean of KPI-C T scores (R=0.513, R=0.435 respectively), KOSA-6 score and K-CBCL total problem behavior T score, the mean of KPI-C T scores (R=0.347, R=0.398 respectively). Conclusion:In children, the larger the impact of SDB on the quality of life is, the higher the rate of personality or behavioral problem is. Therefore, the early and active treatment is needed in children with SDB who are scored highly by KOSA-18 or KOSA-6.

밀폐된 원통형 분무 연소기내의 자연발화 현상에 관한 수치적 연구

최지훈,백승욱,Choi, Ji Hun,Baek, Seung Wook 대한기계학회 1999 大韓機械學會論文集B Vol.23 No.6

In this study, the autoignition process of liquid fuel, injected into hot and stagnant air in a 2-D axisymmetric confined cylindrical combustor, has been investigated. Eulerian-Lagrangian scheme was adopted to analyze the two-phase flow and combustion. The unsteady conservation equations were used to solve the transition of the gas field. Interactions between two phases were accounted by using the particle source in cell (PSI-Cell) model, which was used for detailed consideration of the finite rates of transports between phases. And infinite conduction model was adopted for the vaporization of droplets. The results have shown that the process of the autoignition consists of heating up of droplets, vaporization, mixing and ignition. The ignition criteria could be determined by the temporal variations of temperature, reaction rate and species mass fraction. And the effects of various parameters on ignition phenomena are examined. These have shown that the increasing the reaction rate and/or the vaporization rate can reduce the ignition delay time.

문자 연산자에 의한 최대흡사추정에 관한 연구

최지훈 한국통계학회 1994 응용통계연구 Vol.7 No.1

기호연산이 가능한 소프트웨어인 MATHEMATICA를 이용함으로써 최대흡사 추정량의 구체적 형태를 구할 수 있음을 보였다. 다변량 정규분포로부터의 확률 표본을 이용한 최대 흡사 추정량을 구하는 과정을 예시하였다. Using the software named MATHEMATICA which can evaluate symbolic operation, it is demonstrated to obtain the maximum likelihood estimation form. A sample from Multivariate Normal distribution is adopted to show the process of obtaining the maximum likelihood estimator.

미혼 보육교사의 직무스트레스와 직무만족 간의 관계에서 역량강화지원의 조절효과

최지훈,안선희 가정과삶의질학회 2018 가정과삶의질학회 학술발표대회 자료집 Vol.2018 No.11

FBI 지문 영상 압축 코덱 개발 및 성능 향상 기법에 관한 연구

남재열,최지훈 啓明大學校 産業技術硏究所 1997 産業技術硏究所 論文報告集 Vol.20 No.-

As image are widely used in the various fields such as computer graphics, education, medical information, multimedia, there come to be many efforts to store those images with compression. The JPEG, now, is available as a still picture compression standard. However, it is actually very difficult to use JPEG standard if high compression rate above 20:1 is needed in certain applications, because of many coding defects of the standards. Therefore, it has been greatly desired to develop an algorithm accomplishing such a high compression and providing high image quality at the same time. In this paper, as an answer to those requirements, we developed an image compression codec according to the FBI fingerprint image compression standard which was based on the WSQ technique. It is operable in Windows95(R) environment. While retaining the compatibility with FBI codec, the developed codec came to have better performance than FBI's by the application of the performance enhancing techniques we have studied. The WSQ compression technique used in the development of this codec might be adopted as a next generation compression technique, which is also applicable in electronic ID card and various authentication system industries. We also enlighten that there are many further studies such as the automation technique for the bit-allocation, WSQ parallel processing and an adoptation of WSQ to the moving picture.

자동차용 디스크 브레이크의 열탄성 불안정성에 관한 연구

최지훈,김도형,이인 한국소음진동공학회 2001 소음 진동 Vol.11 No.2

This paper is focused on the frictionally induced thermoelastic instability (TEI) in automotive disk brakes. This instability leads to the formation of localized high temperature contact regions known as hot spots. This article investigates the themoelastic instability in automotive disk brake systems consisting of a finite thickness layer (disk) and two half-planes (pads) using a perturbation method. The antisymmetric mode involves hot spots located alternately on two sides of the disk. As a result the circumferentially periodic hot spots produce rotor surface distortion and Induce low frequency vibration. Also the effects of system parameters on the critical speed for TEI are investigated.

전의(轉義)합성명사의 인지의미론적 연구

최지훈 이화여자대학교 한국어문학연구소 2003 대학원 연구논집 Vol.- No.2003

[토론문] 송라 평론의 값 매김이 타당한가?

최지훈 아동문학평론사 2015 兒童文學評論 Vol.40 No.3

위암의 수술 중 방사선치료의 결과

최지훈,강민규,김명세,김성규,윤상모,김성훈 대한방사선종양학회 2010 Radiation Oncology Journal Vol.28 No.2

Purpose: We retrospectively analyzed the long-term results of radical surgery and intraoperative radiation therapy (IORT) in patients with stomach cancer. Materials and Methods: From 1988 to 1994, 51 patients were treated with curative surgery and IORT. Postoperative external beam radiotherapy (EBRT) was administered to 30 patients, while adjuvant chemotherapy was administered to 35 patients. A dose of 15 Gy was irradiated with a 9 MeV electron beam as the IORT and a median dose of EBRT was 43.2 Gy (range, 7.2 to 45 Gy). The follow-up period ranged from 1∼254 months, with a median follow-up period of 64 months. Results: The median age of all the patients was 58 years (range, 30 to 71 years). The distribution of pathologic stage (American Joint Committee on Cancer [AJCC] 2002 tumor-note-metastasis [TNM]) was as follows: 13 stage I (25.5%), 10 stage II (19.6%), 25 stage III (49.0%), and 3 stage IV (5.9%). Distant metastases occurred in 11 patients (10 in the peritoneum and 1 in bone), including one patient with concurrent local recurrence (anastomosis site). The 5-year locoregional control, disease free survival and overall survival rates were 94.7%, 66.5%, and 51.7%, respectively. For the multivariate analysis, age, TNM stage, and EBRT were significant prognostic factors for overall survival, and only TNM stage for disease free survival. Conclusion: We could have achieved a high loco-regional control rate in patients with locally advanced stomach cancer by adding IORT to radical surgery. However, the benefit of IORT on survival remains to be elucidated. 목 적: 본 연구는 위암 환자에서 근치적 수술과 수술 중 방사선치료(intraoperative radiotherapy)를 시행한 장기 추적 결과를 보고하고자 한다. 대상 및 방법: 1988년부터 1994년까지, 51명의 원발성 국소진행성 위암 환자에게 근치적 수술과 수술 중 방사선치료를 시행하였다. 수술 후 외부방사선치료는 30명의 환자에서, 보조 항암화학요법은 35명의 환자에서 시행되었다. 수술 중 방사선치료는 9 MeV의 전자선을 이용하여 15 Gy를 조사하였으며, 외부방사선치료 조사선량의 중앙값은 43.2 Gy (7.2∼45 Gy)이었다. 보조 항암화학요법은 35명에서 시행되었다. 추적관찰기간의 중앙값은 64개월(1∼254개월)이었다. 결 과: 환자의 나이는 30∼71세(중앙값, 58세)였다. American Joint Committee on Cancer (AJCC) tumor-note- metastasis (TNM) 병기(2002)는 병기 I 13명(25.5%), 병기 II 10명(19.6%), 병기 III 25명(49.0%), 병기 IV 3명(5.9%)이었다. 주된 재발은 원격전이로 11명이었으며, 이 중 1명에서 국소재발이 동시에 발견되었다. 전체 환자의 5년 국소영역제어율, 무병생존율, 전체생존율은 각각 94.7%, 66.5%, 51.7%이었다. 다변량분석에서 전체생존율에 영향을 주는 인자에는 나이, TNM 병기, 외부방사선치료가 있었으며, 무병생존율에 대해서는 TNM 병기만이 유의한 인자였다. 결 론: 국소 진행성 위암에서 근치적 수술과 수술 중 방사선치료로 높은 국소제어율을 얻을 수 있었다. 그러나 수술 중 방사선치료의 생존율에 대한 영향에 대해서는 연구가 더 필요할 것으로 생각된다.

대덕전파천문대 주 전산기용 Digital I/O 구축 및 시스템 안정화

최지훈,임인성,정재훈,김현구,김봉규,강현우,김광동 한국천문학회 2009 天文學會報 Vol.34 No.1