위암의 영상 진단: 전산화 단층 촬영술

이재문,정승은,Lee, Jae-Mun,Jeong, Seung-Eun 대한영상의학회 2002 대한영상의학회지 Vol.46 No.6

Gastric cancer is one of the cancers occurring most frequeently in Korea, and the diagnosis and staging of the cancer, required in order to determine the best method of treatment and the prognosis, are very important. For staging, CT scanning has been widely used, and in this report the author describes the techniques and proce-dures involved, investigating the accuracy and limitations of modality in both the diagnosis and staging of this disease 위암은 한국인에서 흔히 발생하는 종양으로 이의 조기 진단과 정확한 병기결정이 치료방법의 선택과 예후에 매우 중요하다.전산화 단층 촬영술은 위암의 병기결정에 가장 흔히 사용되고 있는 방사선학적 진단방법이다.저자는 위암진단 및 병기 결정을 위한 전산화 단층촬영술검사방법,병기결정 방법 및 그 진단적 정확도와 한계점들을 기술하고자 한다.

대용량 주기억장치 시스템에서 효율적인 연관 규칙 탐사 알고리즘

이재문,Lee, Jae-Mun 한국정보처리학회 2002 정보처리학회논문지D Vol.9 No.4

본 논문은 대용량 주기억장치를 가진 시스템에 적합한 연관 규칙 탐사 알고리즘에 관한 연구이다. 이를 위하여 먼저 기존의 잘 알려진 알고리즘인 DHP, Partition 방법을 대용량 주기억장치를 가진 시스템에서 효율적으로 동작하도록 확장하였고, 다음 Partition 방법에 대해서 해쉬 테이블과 비트맵 기법을 적용하여 Partition 방법을 개선하는 방법을 제안하였다. 제안된 알고리즘은 실험적 환경에서 DHP와 성능이 비교되었으며, 제안하는 알고리즘이 확장된 DHP보다 최대 65%까지 성능 개선 효과가 있음을 보인다. This paper propose an efficient algorithm for mining association rules in the large main memory systems. To do this, the paper attempts firstly to extend the conventional algorithms such as DHP and Partition in order to be compatible to the large main memory systems and proposes secondly an algorithm to improve Partition algorithm by applying the techniques of the hash table and the bit map. The proposed algorithm is compared to the extended DHP within the experimental environments and the results show up to 65% performance improvement in comparison to the expanded DHP.

유사디자인의 권리범위

이재문,Lee, Jae-Mun 한국발명진흥회 2005 發明特許 Vol.30 No.12

유사디자인의 권리범위

이재문,Lee, Jae-Mun 한국발명진흥회 2005 發明特許 Vol.30 No.11

유사디자인의 권리범위

이재문,Lee, Jae-Mun 한국발명진흥회 2006 發明特許 Vol.31 No.1

노인여성의 연령증가에 따른 생활체력 변화 연구

이재문(Lee Jae Mun) 한국사회체육학회 2003 한국사회체육학회지 Vol.19 No.1

This study was designed to measure physical fitness in the daily lives of 508 elderly women, The range of age in each group is divided into 65-69 years old, 70-74years old, 75-79years old, over 80years. The following are the results All factors of physical fitness have slowly decreased in their daily lives as age advances and the results showed that they decreased rapidly from the age of 75. As a result of my investigation I have formed the following conclusions. The reduction of physical fitness in the daily life of women over 65 is inevitable. After the age of 75 there is a sharp decline in physical fitness. I think with regular exercise, good life style habits, and increased physical fitness the results will be a healthier life. The existing system has applied a uniform method regardless of age concerning the health and physical fitness of the elderly. This method should be sublated and replaced with a more systematical exercise prescription. This is necessary for us in these times towards the aging society.

프로펠라 샤프트의 능동진동제어 시스템

이재문(Jae-Mun Lee),이철희(Chul-Hee Lee) 한국자동차공학회 2009 한국자동차공학회 학술대회 및 전시회 Vol.2009 No.11

This paper presents a solution of the vibration reduction in the Propeller shafts. Generally, the vibration mode in propeller shafts can be divided into the bending and torsional vibrations. And the bending vibration is significant factor when it excites with the resonance frequencies in the propeller shafts. However, since the torsional vibration is also the critical source of vibration problem in the propeller shaft, it is necessary to analyze bending and torsion vibration together with the natural frequencies. In this paper, active vibration control system of propeller shafts is introduced to actively absorb the combined bending and torsional vibrations. Proposed active damping structure is built by embedding the piezofiber actuators that are composed of piezopatches based on the Macro Fiber Composite (MFC) technology. The MFC is an innovative actuator that offers high performance and flexibility. The MFC consists of rectangular piezo ceramic rods sandwiched between layers of adhesive and electroded polyimide film, which is heat and chemical resistant polymers. Since the MFC patch is more flexible, durable and powerful than other piezo-materials, it is the best candidate of actuator to apply to the curved surface of the shaft. In order to calculate the vibration modes in the propeller shafts, analytical method and Finite Element Method are used. And to simulate effect of vibration damping, Piezoelectric-thermal analysis is used, too. Experimental investigations are also conducted by PID controller. For the desired vibration damping performance with the limited number of MFC actuators, PID controller is designed and its gains are tuned. Finally, control results are shown. So, the results provide an outlook for the active control using the multi-mode resonance controllers.

Effect of resistance exercise on the isokinetic muscle function of knee joints of elderly women

Lee Jae-Young(이재영),Lee Jae-Mun(이재문),Kim Ku-Tae(김규태),LShoji-Igawa(井川正治) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.2

노화에 따른 근 기능의 저하는 노인이 자립 생활을 하는데 큰 악영향을 미치기 때문에 근력 트레이닝은 활동체력을 유지하는데 매우 효과적이며, 최근에는 부상의 위험이 없는 탄력밴드를 이용한 근력 트레이닝 방법이 많이 권장되고 있다. 이와 같이 노인들에게 알맞은 운동프로그램의 중요성이 제기되고 있으나, 장비와 전문 인력의 부족으로 인해 고령자를 대상으로 한 탄력밴드 운동을 통한 근 기능 향상에 관한 연구는 미흡한 실정이다. 따라서 본 연구는 평소에 운동습관이 없는 고령여성 20명을 대상으로 탄력밴드 운동집단(10명), 비운동집단(10명)으로 분류하였다. 10주간의 탄력 밴드를 이용한 저항성 운동이 고령여성의 슬관절 등속성 근 기능에 미치는 영향을 알아보기 위하여 Biodex을 이용하여 부하속도 60˚/sec와 180˚/sec에서 슬관절 굴곡근력과 신전근력을 측정하여 다음과 같은 결론을 얻었다. 10주간의 저항성 운동을 실시한 후 슬관절 굴근 최대 힘효율의 경우 60˚/sec에서 16.9%, 180˚/sec에서 18.5% 유의하게 증가하였으며(P<.01), 신근 최대 힘효율의 경우 60˚/sec에서 7.3%(P<.01), 180˚/sec에서 13.8%(P<.05) 유의하게 증가하였다. 또한 슬관절 굴근 체중당 최대 힘효율의 경우 60˚/sec에서 12.5%, 180˚/sec에서 16.2% 유의하게 증가하였으며(P<.05), 신근 체 중당 최대 힘효율의 경우 60˚/sec에서 9.8%, 180˚/sec에서 10.6% 유의하게 증가하였다(P<.01). 이상의 결과를 종합해 볼 때 10주간의 저항성 운동이 고령여성의 근 기능을 향상시키고 하지 근력 저하를 예방하기 위한 운동 트레이닝 프로그램을 구성하는데 공헌 할 수 있을 것으로 판단되며, 향후 근력 향상을 위한 다양한 운동 트레이닝 프로그램의 효과를 규명하는 연구가 절실히 요청된다.

규칙적인 운동습관이 폐경기 중년여성의 골밀도 및 신체조성에 미치는 영향

이재문(Lee Jae-Mun),이소은(Lee so-Eun) 한국체육과학회 2008 한국체육과학회지 Vol.17 No.3

This study was investigated that effect of regular exercise program on body composition, and BMD(bone mineral density) of middle aged menopausal women : 10 subjects in experimental group experienced aerobic dance for 7year(3/wk) - EHG, 10 subjects in control group - CG. The followings are the conclusions of this study. 1. EHG compared with CG was demonstrated significantly high numerical value in fat free mass, skeletal muscle mass(p<.05), but no body fat mass, % body fat, BMI. 2. EHG compared with CG improved in Lumbar(L1-L4), femur neck, femur total BMD(p<.05) except femur torch. 3. In lumbar(L1-L4) BMD T-Score, a EHG showed normal range of -0.5, while BMD of CG was decreased by -1.7 As a result, regular aerobic dance habit may help to improve body composition, BMD on middle aged menopausal women.

승용 차량의 제동 성능 예측 프로그램 개발

이재문(Jae-Mun Lee),이철희(Chul-Hee Lee),최문석(Mun-Suk Choi),김철기(Cheol-Ki Kim),고은배(Eun-Bae Koh) 한국자동차공학회 2009 한국자동차공학회 부문종합 학술대회 Vol.2009 No.4

The need to know the braking performance in vehicle has been acknowledged for many years since the invention of vehicles. Since there are numerous design variables as well as nonlinearities in the braking system, it is not easy to predict the braking performance accurately. In this paper, a computation program is developed to estimate the braking performance numerically. This synthetic braking performance program is dealing with pedal force, pedal travel and deceleration by including all braking parts such as master cylinder, booster, valves, brake pads, rotors, and hoses. In order to improve the accuracy of program, the semi-empirical model of braking system is developed by using the empirical test data of pad compression, hose expansion and friction coefficient between pads and rotors. The performance of estimation accuracy is evaluated by comparing with actual vehicle test results. The developed program is easy to operate for the engineers of brake system in developing new vehicles by incorporating the graphical presentation as well as exporting data in Microsoft Excel format.