DSSS-QPSK 베이스밴드 모뎀에 관한 연구

안도랑,이동욱,Ahn Do-Rang,Lee Dong-Wook 한국융합신호처리학회 2004 융합신호처리학회 논문지 (JISPS) Vol.5 No.4

본 논문에서는 DSSS-QPSK 베이스밴드 모뎀의 수신부를 단순화한 구조를 제안한다. 일반적인 수신기 구조는 정합 필터, 역확산기, DQPSK 디코더, 그리고 DLL(Delay Locked Loop) 부분으로 나누어진다. 본 논문에서는 정합 필터와 역확산기 구조가 비슷하다는 것을 이용하여 역확산기 부분에서 하는 역할을 정합 필터에서 담당하게 하였다. 이로 인하여 수신부에서의 연산량이 감소하였고 수신부 구조가 단순화되었다. 이러한 결과는 고속모뎀의 설계에 대단히 중요한 역할을 한다. 그리고 제안한 구조를 이용한 시뮬레이션과 실험을 통해 제안한 방법으로 수신부를 설계할 경우 연산속도가 증가하고 전반적인 구조 단순화를 얻을 수 있음을 보였다. In this paper, we propose a new DSSS-QPSK baseband modem receiver structure. A general receiver consists of matched filter, do-spreader, and DLL(Delay Locked Loop). In this paper, the matched filter plays a role of the do-spreader using the structure similarities between the matched filter and the de-spreader. As a result of the new receiver architecture, we can reduce the computational expenses and get the simpler receiver structure. This result can be used as an important part in designing the high speed modem. And, through the computer simulation and the experiment with the proposed architecture, we show that the proposed receiver structure yields fast operation speed and simple overall architecture.

대한방사선종양학회지 게재 논문의 통계적 오류 현황

박희철(Hee Chul Park),최두호(Doo Ho Choi),안성복(Song-Vogue Ahn),강진오(Jin Oh Kang),김은석(Eun-Seog Kim),박원(Won Park),안승도(Seung Do Ahn),양대식(Dae Sik Yang),윤형근(Hyong Geun Yun),정은지(Eun Ji Chung),지의규(Eui Kyu Chie),표홍렬( 대한방사선종양학회 2008 Radiation Oncology Journal Vol.26 No.4

목 적: 본 연구는 대한방사선종양학회지 게재 논문의 통계 오류 현황을 파악하고 이에 근거한 문제 제기를 통해 학회지의 학술적 발전에 기여하고자 하였다. 대상 및 방법: 2006∼2007년 사이에 대한방사선종양학회지에 게재된 총 77편의 논문을 연구 대상으로 하였다. 각각의 논문에 적용된 통계 방법론의 적정성 평가는 통계점검표를 활용하였다. 통계점검표에는 연구의 종류, 통계기법의 사용 범위, 각 논문에 적용된 통계 기법의 종류, 통계적 기법 적용의 타당성 항목이 포함되었다. 통계 오류는 ‘생략의 잘못’과 ‘시행의 잘못’ 항목으로 나누었다. 한 논문에서 서로 다른 항목이 여러 가지 관찰된 경우 각각 횟수로 측정하였다. 같은 항목이 2회 이상 측정된 경우 1회로 횟수를 측정하였다. 통계 전문가가 개별 논문을 대상으로 통계점검표를 작성하였다. 일차 평가자가 방사선종양학 전문가가 아닌 것에서 올 수 있는 평가 오류가 있을 수 있으므로 개별 통계점검표는 간행위원회에서 한 차례 더 세부 점검을 하였다. 작성된 통계점검표의 통계 분석은 SAS (version 9.0, SAS Institute, NC, USA) 소프트웨어를 이용하였고 빈도분석을 시행하여 각 항목의 빈도와 백분율을 산출하였다. 결 과: 총 77편 중 원문을 다운로드 할 수 없었던 4편을 제외한 73편의 게재 논문을 대상으로 평가하였다. 증례보고는 5편, 원저 논문은 68편이었다. 대상 논문 중 46편의 논문에서 통계적 추론을 사용하였고, 16편의 논문에서 단순한 기술통계를 사용했으며, 11편의 논문에서는 통계적 기법을 사용하지 않았다. 추론통계를 사용한 46편의논문에서 사용된 추론통계의 횟수는 각각 분할표분석 17회(37.0%), 비교통계분석 23회(50.0%), 회귀분석 7회(15.2%), 상관분석 5회(10.9%), 생존분석이 27회(58.7%)였다. 통계 기법을 활용하여 연구 결과를 분석할 때 통계적용의 오류가 없는 논문은 19%였다. ‘생략의 잘못’은 34편(50.0%)의 논문에서 총 50회 관찰되었다. ‘시행의 잘못’은 35편(51.5%)의 논문에서 총 47회 관찰되었다. ‘생략의 잘못’과 ‘시행의 잘못’이 모두 발견된 논문은 21편 (30.9%)이었다.결 론: 대한방사선종양학회지에 게재된 논문에서 통계 분석 과정의 다양한 영역에 걸쳐 크고 작은 통계적 오류가 있음을 확인하였다. 향후 대한방사선종양학회지 투고 논문의 심사 과정에서 통계 오류에 관한 적절한 심사를 추가하는 것이 필요하다고 판단된다. Purpose: To improve the quality of the statistical analysis of papers published in the Journal of the Korean Society for Therapeutic Radiology and Oncology (JKOSTRO) by evaluating commonly encountered errors. Materials and Methods: Papers published in the JKOSTRO from January 2006 to December 2007 were reviewed for methodological and statistical validity using a modified version of Ahn’s checklist. A statistician reviewed individual papers and evaluated the list items in the checklist for each paper. To avoid the potential assessment error by the statistician who lacks expertise in the field of radiation oncology; the editorial board of the JKOSTRO reviewed each checklist for individual articles. A frequency analysis of the list items was performed using SAS (version 9.0, SAS Institute, NC, USA) software. Results: A total of 73 papers including 5 case reports and 68 original articles were reviewed. Inferential statistics was used in 46 papers. The most commonly adopted statistical methodology was a survival analysis (58.7%). Only 19% of papers were free of statistical errors. Errors of omission were encountered in 34 (50.0%) papers. Errors of commission were encountered in 35 (51.5%) papers. Twenty-one papers (30.9%) had both errors of omission and commission. Conclusion: A variety of statistical errors were encountered in papers published in the JKOSTRO. The current study suggests that a more thorough review of the statistical analysis is needed for manuscripts submitted in the JKOSTRO.

핵폐기물 Cask용 후육구상흑연 주철재의 응고 및 특성

안인섭,이도인,허보영 국립경상대학교 공과대학 부설 첨단소재연구소 1991 尖端素材 Vol.1 No.-

In order to develop the sound heavy section casting made of spheroidal graphite cast iron for spent fuel cask in place of forging products and evaluate their material properties, the research was graphite pretreatment for the increased of nodule counts and nodularity. Graphite nodularity of more than 80% and nodule count of more than 60 can be obtained at any position, andsothermal conductivity was decrease, the radiation damping capacity was a decreasing tendency by graphite pretreatment.

암석발파시 순발뇌관과 지발뇌관이 발파진동에 미치는 영향

안도원,강추원,강대우 동아대학교 공과대학 부설 한국자원개발연구소 1993 硏究報告 Vol.17 No.1

Most of the good construction sites have already been developed. Therefore, more and more developers are looking for hills and mountains to build housing complexes as well as commercial buildings. A blasting is necessary for that purpose. But a major concern with blasting in urban area is possible ground vibrations and their harmful effects on nearby structures. Therefore blasting in the developed area must be cautious. Because blasting goes along with vibrations, it is important to decrease the level vibrations. The purpose of this study is to obtain a way to decrease vibrations by controlling detonators. Many blasts were instrumented and monitored at two construction sites in Pusan. The data were analyzed for peak values of vibration and frequency content. Vibrations were analyzed and differences between instantaneous and delay detonators were measured. Conclusions of this study are summarized as follows : ① Vertical component of the peak velocity was the largest among three components. ② Deci-second detonator resulted in the lowest peak velocity. ③ In order to reduce vibrations, DS detonators can be recommended for rock blasting.

Morphology를 이용한 Range 영상의 Edge 검출 및 분류

안도건,박용기,김두영 동아대학교 공과대학 부설 한국자원개발연구소 1995 硏究報告 Vol.19 No.1

Range images provide an explicit encoding of the shape and geometric structure of the objects in the image from the point of view of the sensor. Since morphological methods are inherently geometric in nature, they are ideally suited for the analysis of range images. In this paper we propose the method for edge detection and classification in range images using morphological method and surface normals. Dilation residues and erosion residues of structuring elements at different scales are used to extract edges and surface normals are used to remove noises.

성남시 어린이집 원아 어머니의 구강보건의식과 행태에 관한 조사연구

안용순,김은숙,임도선,정세환,이홍재 한국구강건강증진학회 2000 한국구강건강증진학회지 Vol.1 No.1

The purpose of this study was to evaluate behaviour about oral health of child's mothers in Songnam city, to obtain the data on oral health programs for young child of child care institutions. A self-developed questionnaire with 10 items was delivered to 713 mothers. Mothers were selected by a cluster sampling method. The 662 collected data was analyzed by profession state. The obtained results were as follows : 1. The house wives without job didn't appear the better behaviors about child's oral health than those with job except child's tooth brushing number per day. 2. There were needed to develop mothers' education program, caries prevention program, periodic oral exam program, refer system program after oral exam and tooth brushing program. 3. The 10 subjects were enumerated by contents of mothers' education program.

溺死體 및 水中非溺死體의 肺와 胸腔內 Plancton分布에 關한 實驗的 硏究

安道濟,文國鎭 고려대학교 의과대학 1972 고려대 의대 잡지 Vol.9 No.2

An ascertainment of drowning has been one of the most important subject in legal medicine and many authors have concentrated their efforts on this subject. Among these, especially the demonstration of planctons from the various organs by the disorganization method is of definite importance in establishing the cause of death of cadaver found in the water. But to perform this method, time consuming autopsy is required. Observation of plancton count in the lungs and pleural cavities by needle aspiration without autopsy would play an indispensable part in distinguishing between drowned and non-drowned. The author has conducted a series of experiments on the three groups of rapid drowned, delayed drowned and non-drowned. The following results were obtained. 1. Both in the rapid and delayed drowned groups, planctons were detected in the pleural cavities, and there were larger number in right side than left side. 2. In non-drowned group, the planctons were not found in the pleural cavities, however, planctons were found in the pleural cavities of putrefacted cases which were added more than 2㎏ pressure in the water. 3. The number of planctons in the pleural cavities revealed tendency to increase from 1 week after death in the rapid and delayed drowned groups. 4. The largest number of planctons were detected in the both right and left lower lobes of the lungs in both rapid and delayed drowned groups. 5. The above findings of planctons in the pleural cavities and lungs are believed eventually to contribute to the actual differentiation between the drowned and the non-drowned.

진동억제용 다중동흡진기의 효과에 관한 연구

안찬우,김동영,홍도관 동아대학교 환경문제연구소 1998 硏究報告 Vol.21 No.2

In a number of cases it appears expedient to install several absorbers of smaller masses instead of one. This may be due to the need to distribute the absorber's response along the construction, restrictions on the absorber's installation and transportation and other reasons. The application of multimass absorbers is not limited to protection from harmonic actions. The complete optimization of the absorber's parameters reduces to resonance amplitude. So, we studied characteristic of main vibration system and multi dynamic absorber's system for the optimal natural frequency ratio and damping ratio of multi dynamic absorber. Also we obtain the optimization of the multi dynamic vibration absorber's parameters using computer simulation for the damped main vibration system. In designing multi dynamic vibration absorber, we are presented for the optimum values of the mass, spring constant and damping coefficient of multi dynamic vibration absorbers.

통계적 기법을 이용한 마이크로 스피커 다이아프램의 최적형상설계에 관한 연구

안찬우,홍도관,최재기,박진우 東亞大學校附設 生産技術硏究所 2007 生産技術硏究所硏究論文集 Vol.12 No.-

This study uses response surface methodology to explain correlations between the objective function and design variables, fractional factorial design and central composite design were carried out. The change of shape of diaphragm, thickness of diaphragm and voice coil weight based on fractional factorial design and central composite design are made. Therefore this study carried to decide design variables for minimizing 1st natural frequency and maximizing 2nd natural frequency of diaphragm using response surface methodology and screening(fractional factorial design), we showed improved design variables.

4-vessel occlusion으로 誘發한 흰쥐 前腦虛血의 神經細胞 損傷에 대한 大黃의 防禦效果

安德均,元道喜,金鍾虎 대한본초학회 1999 大韓本草學會誌 Vol.14 No.1

Neuroprotective and prophylatic neuroprotective effects of the Rhei Rhizoma on the rat's transient forebrain ischemia caused by 4-vessel-occlusion are concluded as following. 1. The neuroprotective effects of i.p. injection and oral administration on the neuronal density of hypothermic rats in the CA1 region of the hippocampus 7 days after 10-minute 4-BO. provided significant neuroprotection at the dose of 500 and 1000 ㎎/㎏. 2. The neuroprotective effects of Rhei Rhizoma extracts i.p. injection and oral administration on the neuronal density of normothermic rats in the CA1 region of the hippocampus 7 days after 10-minute 4-VO. provided significant neuroprotection at the dose of 500 and 1000 ㎎/㎏ against the ischemia-induced cell death when i.p injection and administration was initiated immediately after occlusion. 3. The prophylactic neuroprotective effects of Rhei Rhizoma extracts i.p. injection and oral administration pretreatment on the neuronal density of hypothermic rats in the CA1 region of the hippocampus 7 days after 10-minute 4-VO, provided significant prophylactic neuroprotection at the dosage of 500 and 1000 ㎎/㎏ against the ischemia-induced cell death when i.p. injection administration was initiated immediately after occlusion. 4. The prophylactic neuroprotective effects of Rhei Rhizoma extracts i.p. injection and oral administration pretreatment on the neuronal densith of normothermic rats in the CA1 region of the hippocampus 7 days after 10-minute 4-VO. provided significant prophylactic neuroprotection at the dosage of 1000 ㎎/㎏ against the ischemia-induced cell death when i.p. injection and administration was initiated immediately after occlution. According to the above results, Rhei Rhizoma has showed neruoprotective and prophylatic neuroprotective effects on the rats' transient forebrain ischemia caused by 4-vessel-occlusion. Therefore Rhei Rhizoma is recommended to be used for the prevention and curing of ischamia diseases.