이동 로봇의 실내 환경 인식을 위한 초음파 센서 자료 분석

고낙용,임병현,김성철 조선대학교 전자정보통신연구소 2003 電子情報通信硏究所論文誌 Vol.6 No.1

For autonomous navigation of a mobile robot using landmarks, it is essential to recognize the location and configuration of surrounding objects To recognize the environment, sensors such a s ultrasonic sensors laser range finder. CCD camera, and so on have been used Among the sensors, ultrasonic sensors(sonar) are unexpensive and easy to use However, the data from untrasonic sensors inherently include noisy information In this paper we analyze the sonar data and propose a method to reduce some of the noisy information to recognize features of indoor environment. It is supposed that the environments consist of features of planes, edges, and -corners For the analysis, sonar data of plane, edge, and corner are accumulated for known models The data are filtered to eliminate some noise using the Kalman filter algorithm Then, the data for each feature are compared with model data to extract the characteristics of each feature. We demonstrate the applicability of the proposed method using the sonar data obtained form a sonar transducer rotating and scanning the range information around indoor environment

간헐적 유산소성 운동이 비만아동의 신체구성과 혈청지질 대사에 미치는 영향

고기준,안병철 한국스포츠리서치 2003 한국 스포츠 리서치 Vol.14 No.3

This study examined the effect of supervised intermittent aerobic exercise on body composition, subcutaneous fat area and serum lipid metabolism of obese children. The subjects were 16 obese 10-to 11-years-old boys, and engaged in aerobic exercise(9 weeks, 5days/week, 60~70% HRmax). Intermittent aerobic exercise prescription was mountain climbing(40min) at dawn and basketball and football dribble(20min+20min+20min) in the morning, noon recess, afternoon. Analytical items were body composition and fat area(skinfold and CT scan) and serum lipid profile(enzymatic method). The conclusions obtained from this study were as follows; 1) In body composition after intermittent aerobic exercise was increased significantly in body density(P<0.001), and decreased significantly in %fat, fat mass and body mass index(P<0.001). 2) In subcutaneous fat area after intermittent aerobic exercise was decreased significantly in trunk fat area, abdomen fat area and thigh fat area(P<0.001). 3) In serum lipid profile after intermittent aerobic exercise was decreased significantly in TC, TG and TC/HDL-C(P<0.05; P<0.001), and increased significantly in HDL-C(P<0.05), and decreased in LDL-C but with no statistical signification.

반건식-백필터에 의한 소각배가스 중의 HCI, SOx 제거 (Ⅰ)

배병훈,신남철,고경숙,김춘희,문종익,임경택 동아대학교 환경문제연구소 1997 硏究報告 Vol.20 No.1

This study has been carried out to investigate the removal efficiencies of HCl/SOx in a Spray-Dryer/Fabric-Filter system. In HCl/SOx removal, we could identify the key factors such as spray dryer outlet temperature, molar equivalence ratio(MER) and fabric filter velocity, but we couldn't find out the correlation of HCl and SOx. The removals of HCl/SOx were inversely proportional to spray dryer outlet temperature(l30~170℃) and filter velocity(l.0~1.5 m/min), at the MER, HCl removal efficiency was strongly proportional to MER, but SOx, removal efficiency was not particularly increased by MER over 1.5. The removal efficiencies of HCl/SOx were improved over 10% at the fabric filter. In this Spray-Dryer/Fabric-Filter system, HCl/SOx removal efficiencies were about 99%, 96% respectively.

방광 소세포암:1예 보고

허정남,김용수,조온구,고병희,임현철,함창곡 한양대학교 의과대학 2001 한양의대 학술지 Vol.21 No.2

Small cell carcinoma(also known as oat cell carcinoma) of the urinary bladder is an extremely rare malignancy and is derived from neuroendocrine stem cells. It is usually biologically aggressive tumor with early vascular and muscle invasion, so it has poor prognosis. Radiological findings of small cell carcinoma are similar to other malignancies of urinary bladder, therefore it is impossible to distinguish small cell carcinoma from other malignancies. Pathologic study is an only useful method for differential diagnosis of bladder tumor. We report here the case of 74th years old woman presented with painless gross hematuria.

응급의학과에서의 인공호흡기 처치

이삼범,도호석,도병수,이창현,심민철,권굉보 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

Study Objectives : To investigate and resolve the problems related with ventilator management in ED(emergency department). At present the ventilator is essential equipment of ED on university hospital and emergency center in Korea. Design : Retrospective consecutive case series. Setting : University teaching hospital Type of participants : All patients admitted and recieved ventilator management in ED of yeungnam university hospital from Jan. 1994 to jul. 1995. Methods and interventions : Charts of all patients were reviewed to determine the frequency, the types and causes of respiratory failure, the death rate, the mean duration of admission, the complications, and CPR(cardiopulmonary resuscitation) related with ventilator management in ED. We also identified the problems related with ventilator management by ED physicians and nurses through the answers to seven questions that suggested by us about ventilator management in ED. Measurements and main result : There were 34,751 admissions through ED during the study period. Of these 160 patients managed with ventilator in ED. The frequency of ventilator management in ED is increased at 1995(0.73%) that compared with 1994(0.32%). Non-trauma(113 cases) and hypoxic respiratory failure(83 cases) patients are more common than trauma(37 cases) and ventilatory failure Total CPR rate related with ventilator management are 25.3%. The mean duration of admission are 12.56±20.28 days, and the death rates are 45.3%. The incidence of complications occurred during ventilator management in ED are 37 cases. About seven questions suggested by us to 30 ED staffs(ED physician, nurses and paramedics), most frequent answer is the difficulty of keeping ventilator in ED because other department rent ventilator from ED and lost a part of ventilator. Conclusion : As the use of ventilator in ED is increased the emergency physician should be well trained for the indications, complications, setting mode and general problems of machine occurred during ventilator management in ED patients.

대구 상인동 가스참사로 본 지역 응급의료체계에 대한 고찰

이삼범,도호석,도병수,이창현,심민철,권굉보 대한응급의학회 1995 대한응급의학회지 Vol.6 No.2

Disaster may be defined as a sudden calamitous event associated with great damage or destruction. A more common definition, among emergency-preparedness planners, is a medical occurrence that overwhelms medical care systems and facilities. Most regional disaster plans are formulated to respond to disasters of moderate size. At 07:50 A.M. on 28 April 1995, gas explosion was happened at Sangin-Dong where was going to be under construction of subway in Taegu, Korea. 102 victims had died and 178 victims had moderate or minor injuries. Problems in the organization at the scene, triage, field management, transport to the hospital, and the communication contributed to the confusion in the management of victims. An analysis of this disaster allows several lessons to be learn about perimeter control, command functions, crowd control, and transportation priorities. It will benefit disaster planners in other communities.

양이온 고분자전해질의 수중 입자의 응집에 미치는 교반강도 및 주입량의 영향

감상규,문창성,김대경,고병철,허철구 濟州大學校 海洋硏究所 2002 해양과환경연구소 연구논문집 Vol.26 No.-

Using several cationic polyelectrolytes of different charge density and molecular weight as flocculants and a simple continuous optical technique(photometric dispersion analyzer, PDA), the effects of mixing intensity and polyelectrolyte dosage on flocculation of kaoline particles(35 NTU) and particles(34.7 NTU) in Kangjung reversior of heavy rainfall have been examined. The optimum mixing was obtained at the stirring of 200rpm(G= 869 s^-1). The charge density of a polyelectrolyte is important in determining the optimum dosage and in the removl of particles. The optimum dosage is less for the polyelectrolyte of higher charge density and at the dosage, the removal of particles is higher for the polyelectrolyte of higher charge density and zeta potential of particles reaches to near zero. The optimum dosage for the removal of particles should be determined by flocculation test and not be determined by the turbidity of particles in water.

Investigation of the Magnetic properties of Li0.8Na0.2FePO4 by using the M¨ossbauer Spectroscopy

Byung Ug Ko,Taejoon Kouh,Chul Sung Kim,Jung Chul Sur 한국물리학회 2016 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.69 No.4

We have investigated Li0.8Na0.2FePO4, a cathode material for secondary battery applications, by using X-ray diffractometry (XRD), vibrating sample magnetometry (VSM) and M¨ossbauer spectroscopy. The crystal structure is found to be orthorhombic with lattice parameters of a0 = 10.333 °A, b0 = 6.011 °A and c0 = 4.700 °A. From the temperature dependence of both the magnetization and the M¨ossbauer spectra, the N´eel temperature is found to be TN = 51 K and the spin reorientation temperature to be TS = 20 K. The magnetic hyperfine field (Hhf ), electric quadrupole splitting (EQ) and isomer shift () at 4.2 K are found to be Hhf = 130.50 kOe, EQ = 2.63 mm/s and = 1.25 mm/s.

Deformation Map for Hot Working of AA2024 Composites Reinforced with SiC Particle

Ko Byung Chul,Yoo, Yeon Chul 대한금속재료학회(대한금속학회) 1999 METALS AND MATERIALS International Vol.5 No.6

The dynamic deformation behavior of Al 2024 composites reinforced with 1 and 8 ㎛ SiCp (15 vol.%) has been investigated in the temperature range of 370 to 500℃ and strain rate range of 0.1 to 3.0/sec by torsion testing. Processing maps showing the variation of the efficiency of power dissipation expressed by [2m/(m+l)], where m is the strain rate sensitivity, with temperature and strain rate have been described for the composites. Also, the domain of dynamic recrystallization (DRX) and peak efficiency of the composites were analyzed to suggest an optimum hot working condition for DRX. The SiCp/A12024 composite with 8 ㎛ SiCp showed 40% efficiency at the DRX domain (370∼460℃, 0.1∼0.5/sec). The optimum temperature and strain rate condition for the DRX of the composites is 430∼450℃ and 0.5/sec. The characteristics of these results were discussed with the help of microstructural observation during hot deformation.

성인에서 발생한 소장 지방종에 의한 공장-공장 중첩증 1예

김병철 ( Byung Chul Kim ),정석원 ( Seok Won Jung ),권성호 ( Sung Ho Kwon ),박재석 ( Jae Serk Park ),고병균 ( Byung Kyun Ko ),김영민 ( Young Min Kim ),김도하 ( Do Ha Kim ) 대한내과학회 2008 대한내과학회지 Vol.75 No.3

성인에 있어서의 장중첩증은 소아와 달리 대부분 원인질환을 동반하며 임상증상도 지속적이기보다는 단속적인 경우가 많고, 오히려 급성보다는 만성의 경과를 취하는 경우가 더 흔하다. 특히 그 원인이 소장의 지방종에 의한 것은 매우 드물며, 대부분 원위측 회장에서 발생한 지방종에 의한 장중첩증이 보고되었다. 저자들은 복부 수술의 병력이 없는 성인에서 정형외과적 수술 후 발생한 공장의 지방종에 의한 공장-공장 중첩증 1예를 경험하였기에 문헌고찰과 함께 보고한다. Intussusception is a prolapse of a segment of the intestine into the lumen of the adjacent intestine. The majority of intussusceptions occur in infancy and early childhood. Intussusception arising in adulthood represents only about 5% of all intussusceptions and is usually caused by a malignant small bowel lesion acting as an apex for intussusception. Lipoma is not a common tumor in the gastrointestinal tract, and gastrointestinal lipomas may be submucosal or subserosal. Most of them are asymptomatic, although they may cause abdominal pain, bowel obstruction, and gastrointestinal bleeding. Intestinal intussusception caused by lipoma is uncommon and is particularly rare when the lipoma is located in the small intestine. We report an unusual case of intussusception in an adult male patient, which was caused by a lipomatous lesion located in the proximal jejunum acting as a lead point. (Korean J Med 75:333-336, 2008)