조정 및 카누훈련이 폐기능에 미치는 영향

권태동,전중기,김형렬 대구대학교 기초과학연구소 1998 基礎科學硏究 Vol.14 No.2

In the present study, an effort was directed to elucidate the effect of the physical training on the pulmonary function. Nine male athletics major student who have undergone regular physical training for more than five years were randomly chosen as the athletic subjects, and 9 regular male students who have not been engaged in any form of regular physiycal exercise or training were chosen as the non-athletic subjects, and a comparison was made between the two groups. The following were mainly observed by spirometry for the study respiratory rate, tidal volume, vital capacity, maximun voluntary ventilation (MVV), forced expiratory volume for 1 second (FEY, ), percent FEV, to forced vital capacty (FEV 1%), forced expiratory flow for initial 1 liter (FEF 0.2-1.2L), and forced mid-expiratory flow (FEF 25-75%) The results obtained are summarized as follow; 1) The respiratory rate, and tidal volume showed no significant difference between athletes and non-athletes. The VC and MVV in non-athletes was significantly (p< 0.05, p <0.01)increased to 5.552±0.138L, 158.2±3.11L/min comparing with 4.770±0.2444L, 128.3±9.1L/min in non-athletes. 2) FEV, was 4.781±0.193L in athletes and 4.249±0.136L in non-athletes ; FEV 1% 84.12±1.12% in athletes and 73.45±1.79% in non-athletes, both was significantly (p < 0.05)increased in athletes. 3) FEF0.2-1.2L/min was 296.4±11.7L/min in athletes and 227.7±14.5L in non-athletes ; FEF 25-75% was 3.673±0.119L/sec inathletes and 2.810±0.178L/sec in non-athletes, both showing significant(p<0.05) increase in athletes. 4) Some liscussions were made on these results. The lung volumes showed no significant difference between the two groups, but VC, MVV, FEV1, FEV, %, FEFO.2-1.2L and FEF25-75% in athletes were significantly (p<0.05, p<0.01, p< 0.05, p<0.05, p<0.05, p< 0.05 respectively)higher than in non-athletes. It is therefore concluded that the athletes have more powerful respiratory muscles, or higher compliance of the lung and thorax than the non-athletes.

운전시간이 폐수처리에 미치는 영향

최충식,하청근,권기석 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1

The aim of the thesis is to value the features of Sequencing Batch Reactor and to discover the optimum condition by using synthetic wastewater. So as to develop the economical, efficient wastewater treatment technology which can remove substrate and nitrogen compounds by SBR Fill and Reaction time control. The results are summarized as fallows. 1. COD and T-N removal efficiency was below 95% in case of volumetric organic loading of 3㎏ BOD/㎥ day by Sequencing Batch Reactor. 2. Almost COD removed in the Fill time. 3. Various DO concentration are maximum in the Reaction time, and minimum in the Settle and Idle time. 4. COD and T-N were almost removed in Fill and Reaction time, the most suitable period was 5-3-2hr(Fill-Reaction-Settle). Removal efficiency of COD and T-N were over 98%.

안동호 상류 운곡천의 이화학적 수질특성과 식물플랑크톤 군집 특성

이중복,이희무,이건주,박정원,박재충,김동걸,권기석 7개 국립대학교 환경연구 논문집 공동발행 위원회 2002 환경연구논문집 Vol.2 No.1

This investigation is about the characteristics of phytoplankton community and physciochemical water quality of specific 6-point the Woon-kog stream system in upsteam of the Andong Lake. DO value was showed over 8.1㎎/L at each site and COD_Mn, BOD, T-N, T-P tend to increase as they stream down and that the existence and dominance of phytoplankton was low and it was difficult to conclude the definite correlation of water quality and phytoplankton community. Finally, it seemed to be desirable that alternatives for pollutional reduction should be made and performed on the basis of the continuous monitoring of the inflow to preserve the Andong Lake.

Introduction to poly etcher using VHF - ICP source for next generation etch processing

Gi-chung Kwon,Hong-Seub Kim,Seong-Hyuk Choi,Y. K. Lee,H. Y. Chang,Kwangju-Si,Kyunggi-Do 한국진공학회 2004 한국진공학회 학술발표회초록집 Vol.- No.-

Derivation of DCGL for NPP at Wolsong Site by Using RESRAD-ONSITE Code

Chung-gi Kwon,Jun-Yeop Lee 한국방사성폐기물학회 2021 한국방사성폐기물학회 학술논문요약집 Vol.2021 No.11

Investigating the Wafer Temperature in an Atmospheric-Pressure Plasma Process

Kwon Gi-Chung,Kim Woo Jae,Lee Tae Hyun,Lee Hwan Hee,Kwon Hee Tae,Shin Gi Won 한국물리학회 2020 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.77 No.6

The atmospheric-pressure plasma (APP) process is used in various fields nowadays. One important characteristic of the APP process is the temperature of the wafer heated by the atmospheric-pressure plasma. In this study, the effects of the input power and the discharge distance on the heat generated during the atmospheric plasma process were analyzed, and the mechanism was predicted. We used a fluoroptic thermometer and infrared camera to measure the wafer temperature and a VI probe and a current probe to measure the electrical properties. The results showed that, as the input power was increased, the wafer temperature increased, and as the discharge distance was increased, the wafer temperature decreased. Thus, we can confirm that resistance heating was the mechanism that caused the wafer temperature to rise; it is related to the current intensity and the resistance of the current flowing through the wafer.

탐색식간 최적화에 기반한 효율적 디스크 스트라이핑 기법

권기식(Gi Sick Kwon),장시웅(Si Ung Jang),정기동(Gi Dong Chung) 한국정보과학회 1993 한국정보과학회 학술발표논문집 Vol.20 No.1

중앙처리장치(CPU)와 주기억장치(main memory)의 발전속도에 미치지 못하고 있는 입출력서브 시스템(input/output subsystem)들의 성능향상을 위해 많은 연구들이 진행되고 있다. 이들 중 소형의 저가 디스크들을 이용한 디스크 배열(disk array)이 최근에 널리 연구 및 구현되고 있다. 이는 화일을 여러 개의 디스크들에 일정량만큼씩 나누어 인터리빙(interleaving)시키는 방법이다. 이 기법은 분산되는 데이타량에 따라 상당한 시스템 성능차이를 보인다는 사실이 실험에 의해 알려져 있다. 이 전의 연구들은 가변적이기 보다는 고정적인 스트라이핑 단위를 사용, 데이타 전송시간 향상을 이루는데 주력하고 있다. 반면 본 논문에서는 가변적 스트라이핑 단위(striping unit)를 디스크들에 분산시킴으로써 데이타 전송시간의 향상뿐만 아니라 탐색시간 최적화를 통한 이득도 취할 수 있는 방안을 제시한다. 본 논문에서 제안하는 “가변단위 디스크 스트라이핑”(Variable-unit Disk Striping0방법은 한 번의 탐색동작으로 요청된 입출력동작을 처리해 줄 수 있으므로 비교적 큰 화일 요청시 높은 성능향상을 기대할 수 있다.

전자오븐을 이용한 간편하고 연속적인 마이크로파 발생 장치 개발

권기청(Gi-Chung Kwon),김재현(Jayhyun Kim),김정희(Junghee Kim),이효석(Hyo-Suk Yi),전상진(Sang-Jean Jeon),허승희(Songwhe Huh),최원호(W. Choe) 한국진공학회(ASCT) 2000 Applied Science and Convergence Technology Vol.9 No.3

KAIST-TOKAMAK에서 재현성이 좋은 저항가열 플라즈마를 발생시키는데 필요한 전이온화(pre-ionization)에 응용하기 위해 2.45 ㎓ 마그네트론을 사용하여 간편한 마이크로파 발생장치를 개발하였다. 장치에 사용한 마그네트론은 출력 500 W, 주파수 2.45 ㎓이며, 일반적인 가정용 전자오븐(microwave oven)에 사용된다. 기존의 가정용 마그네트론은 음극(cathode)과 양극(anode)사이에 걸리는 고전압이 60 ㎐의 주기를 갖기 때문에 약 16 ㎳ 마다 약 8 ㎳ 동안만 주기적으로 마이크로파를 발생한다. 이 마그네트론을 사용하여 토카막 전이온화에 충분할 정도로 연속적으로 발생되는 마이크로파를 얻기 위해서 음극과 양극사이에 개량된 회로로 리플전압이 작은 DC 고전압(5㎸, 1 A)을 인가하였다. 본 논문에서는 주기적으로 생성ㆍ소멸하는 ECH 플라즈마와 연속적인 ECH 플라즈마를 발생시켜 랑뮈어탐침과 광증배관(PMT)을 이용한 이온 포화전류와 H_α 방출(emission)을 측정하여 마이크로파 발생장치의 특정을 조사하였다. In order to utilize as a pre-ionization means for reproducible ohmic plasma on KAIST-TOKAMAK, a simple, safe, economical and continuous microwave source has been developed using a home kitchen microwave oven. The magnetron used in the study can provide 500 W of power at 2.45 ㎓. A conventional magnetron in a home kitchen microwave oven generates microwave for 8 ㎳ at every 16 ms periodically due to the periodic (60 ㎐) high voltage applied to the magnetron cathote. In order to generate continuous microwave which is suitable for tokamak pre-ionization, the magnetron operation circuit has been modified using a DC high voltage (5 ㎸, 1 A) power supply. It provides high-voltage with small ripple for magnetron cathode bias. Using the developed magnetron system, electron cyclotron resonace heated (ECH) plasmas were produced and the characteristics of the system were studied by diagnosing the ECH plasma using Langmuir probe and H_α emission diagnostics.

The comparison of end-point detection between optical emission spectroscopy and residual gas analysis in silicon etching in NF3/Ar Plasma

Hee Tae Kwon,Woo Jae Kim,Gi Won Shin,Hwan Hee Lee,Tae Hyun Lee,Gi Chung Kwon 한국진공학회 2018 한국진공학회 학술발표회초록집 Vol.2018 No.8

조기대장암의 임상 양상 및 치료 결과

권광안 ( Kwang An Kwon ),김유경 ( Yu Kyung Kim ),정문기 ( Moon Gi Chung ),박동균 ( Dong Kyun Park ),권오상 ( Oh Sang Kwon ),김선숙 ( Sun Suk Kim ),김연석 ( Yeon Suk Kim ),권소영 ( So Young Kwon ),구양서 ( Yang Suh Ku ),최덕주 ( Du 대한장연구학회 2005 Intestinal Research Vol.3 No.2

목적: 최근 조기대장암의 내시경 치료의 가능성에 대한 관심이 높아지고 있다. 이에 저자들은 조기대장암의 임상양상 및 치료결과에 대하여 알아보고자 하였다. 대상 및 방법: 1999년 7월부터 2004년 6월까지 대장암으로 진단 받은 969명 중 117명(120병소)의 조기대장암 환자의 의무기록을 후향적으로 조사하였다. 결과: 전체 대장암 중 조기대장암의 빈도는 12.1%였고 점막암이 80예, 점막하층암이 40예였다. 조기대장암에서 병변의 평균크기는 1.8 cm, 암조직의 평균크기는 1.1 cm였다. 병변의 평균크기는 점막하층암이 2.2 cm로 점막암의 1.7 cm보다 컸다(p=0.03). 육안적 분류로 편평형에서 점막하층암이 30%로 점막암의 15%보다 높은 경향을 보였다(p=0.07). 조직학적 분화도는 고분화선암이 77.5%였으며, 중등도 분화를 보인 경우는 점막하층암에서 63%로 점막암의 3%보다 유의하게 높았다(p<0.001). 조기대장암에 대한 치료는 점막암 80예중 초치료로 10예에서 수술을 시행하였고, 70예에서 내시경 절제를 하였으며, 이 중 2예에서 추가 수술적 절제를 시행하였다. 점막하층암 40예에서는 초치료로 19예에서 수술을 시행하였으며, 21예가 내시경 절제를 받았고 이 중 13예에서 추가 수술적 절제를 받았다. 결론: 본 연구에서 조기대장암의 빈도는 12.1%로 국내 과거 보고보다 증가하고 있으며, 조기대장암에서 내시경 치료를 고려하는 경우 크기가 2 cm 이상이며 중등도 분화도를 보이는 편평형 조기대장암에서는 점막하층암일 가능성을 고려하는 것이 치료에 도움이 될 것으로 생각한다. Background/Aims: Recently, it has been more interested in the early colorectal cancer (ECC) with possibility of endoscopic treatment. We evaluated the clinicopathological characteristics and the treatment results of the ECC. Methods: 120 cases of ECC from 969 patients with colon cancer were analyzed. The cases of concomitant advanced colon cancer were excluded. Results: 12.1% of total colon cancer was ECC. 80 and 40 cases were mucosal (M) and submucosal (SM) cancer, respectively. The size of lesion and cancer tissue of SM cancer was significantly larger than that of M cancer (lesion size, 2.2 vs. 1.7 cm, p=0.03; cancer size, 1.7 vs. 0.7 cm, p<0.001). The prevalence of flat type in SM cancer was higher than that of M cancer (30% vs. 15%, p=0.07). Moderately-differentiated type was more common in SM cancer than M cancer (63% vs. 3%, p<0.001). 15 cases received the additional operation (M cancer; 2, SM cancer; 13). The metastasis of lymph nodes was verified in 2 cases of SM cancer. Conclusions: The ECC with flat type, more than 2 cm in size and moderately-differentiated type had the possibility of SM cancer. Therefore endoscopic treatment in patients with those characteristics should be considered with caution. (Intestinal Research 2005;3:133-139)