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다양한 레이더 구조를 이용한 HF 대역에서의 상관 기반 표적 인식 성능 비교
박치환(Chi-Hwan Park),설승환(Seung-Hwan Seol),최인식(In-Sik Choi) 한국정보기술학회 2017 한국정보기술학회논문지 Vol.15 No.5
Correlative target recognition is one of target recognition techniques which is used in the environment that we can’t extract the scattering centers because of narrow bandwidth, and it is very simple and robust to noise. In this paper, we performed the correlative target recognition for the various radar structures such as monostatic case, bistatic 30˚, bistatic 90˚ and bistatic 150˚. For the experiment, we used 6 targets, which are classified as fighter, stealth fighter and stealth bomber. We used both the target discrimination ratio and probability of target recognition as the performance measure for the various SNR. The result showed that the probability of target recognition is higher than 90% when the SNR is higher than 5dB. Furthermore, we can see that the bistartic 90˚ radar structure is most adequate for the correlative target recognition.
증례 : 순환기 ; 독사조신 복용 후 발생한 여성형유방증 1예
박인성 ( In Seong Park ),이남희 ( Nam Hee Yi ),박치환 ( Chi Hwan Park ),박승운 ( Seung Woon Park ),유진석 ( Jin Seok Yu ),정준훈 ( Joon Hoon Jeong ) 대한내과학회 2016 대한내과학회지 Vol.90 No.3
Doxazosin은 알파아드레날린길항제의 대표적인 약으로 전립선비대증에 아주 흔하게 사용되고 있다. 비슷하게 사용되는 finasteride, dutasteride와 같은 5-알파환원효소억제제는 여성형유방증, 유방통과 같은 부작용이 흔하게 보고되고 있으나 알파아드레날린길항제는 보고된 바가 국내에 아직 없다. 또한 알파아드레날린길항제는 약리 기전으로 보아 그러한 부작용을 의심하는 것이 쉽지 않다. 이에 doxazosin 사용 후 일측성의 여성형유방증과 유방통이 발생한 1예를 경험하였기에 국내 첫 번째 사례로 보고하는 바이다. Doxazosin is an adrenergic alpha-1 receptor antagonist used to treat lower urinary tract symptoms that are common in prostatic hyperplasia. To our knowledge, few cases of gynecomastia and mastodynia, as a complication of adrenergic alpha-1 receptor antagonist, have been reported to date; no cases have been reported in Korea. We describe a case involving a 78-year-old man treated for prostatic hyperplasia with 13 months of doxazosin. He complained about unilateral gynecomstia and mastodynia. Five months after the discontinuation of doxazosin, the gynecomastia was significantly improved. This is the first reported case of gynecomastia and mastodynia associated with doxazosin use in Korea. (Korean J Med 2016;90:239-242)
HF 대역 모노스태틱 및 바이스태틱 레이더의 데이터 압축 성능 비교
박치환(Chi-Hwan Park),최인식(In-Sik Choi),채대영(Dae-Young Chae) 한국정보기술학회 2016 한국정보기술학회논문지 Vol.14 No.11
In this paper, we performed a data compression experiment of the transient response for a monostatic and bistatic 30˚, 90˚, 150˚ radars. For the experiment, we used 9 targets, which are classified as fighter, stealth fighter, bomber and stealth bomber. We employed the DWT (Discrete Wavelet Transform) and PCA (Principal Component Analysis) for efficient data compression. First, we compared the performance using only DWT with that using DWT and PCA through the reconstructed signal and the relative error. Then, we calculated the mean value of the relative error for all target and all aspect angle in order to compare the compression performance according to the radar structure. The results showed that 7 targets except for 2 targets had the smallest relative error at bistatic angle 150˚. Thus, we can know that the best compression performance is obtained at bistatic angle 150˚.
단기간의 카테킨 섭취가 운동후 회복기 지방연소 및 혈중 지질성분에 미치는 영향
하민수(Ha Min-Soo),지치환(Jee Chi-Hwan),김정석(Kim Jung-Suk),박석(Park Sok) 한국체육과학회 2010 한국체육과학회지 Vol.19 No.3
The purpose of this study was to examine the effects of catechin supplement on fat oxidation, free fatty acids (FFA) and triglyceride (TG) following two different treatments (placebo [PL] and catechin [CT])). Seven healthy male collegiate students participated as subjects after signing an informed consent. The submaximal exercise intensity of this study was the maximal fat oxidation exercise intensity (MFOEI) of subjects. To comparative analysis on the effect of lipid metabolism after exercise (300 kcal) after short-term supplement of catechin for three days it was compared the respiratory exchange ratio(RER), fat kilocalories (Fkcal), FFA and TG following every treatment methods. First, there were not significant differences in fat oxidation included RER and Fkcal among treatment methods. However, the RER values was decreased in the CT and the Fkcal values was increased in the CT than PL. Second, there were significant differences in FFA and TG among treatment methods(p<.05). The TG of CT was significantly higher than PL at 10min of recovery. The FFA concentration of CT was significantly higher than PL at 30 min of recovery. Especially, CT treatment has high than PL for recovery periods. In summary, results of this study revealed that catechin have the beneficial effects on fat oxidation and glycogen sparing by fat metabolism facilitation. Although the detailed molecular mechanism by which catechin enhances fat use during exercise remains to be elucidated, activation of lipid metabolism in skeletal muscle is believed to be a key factor.
터너증후군 환자의 대동맥 축착증을 스텐트 삽입술로 치료한 증례 1예
박승운 ( Seung Woon Park ),이한철 ( Han Cheol Lee ),이남희 ( Nam Hee Yi ),박인성 ( In Seong Park ),박치환 ( Chi Hwan Park ),유진석 ( Jin Seok Yu ) 대한내과학회 2015 대한내과학회지 Vol.89 No.3
Cardiovascular malformations, such as bicuspid aortic valve and coarctation of the aorta, are more prevalent in patients with Turner syndrome than in the general population. Here, we describe the case of a 35-year-old female with Turner syndrome who was admitted to our hospital with a fever caused by infective endocarditis. Aortic coarctation was diagnosed using computed tomography. The patient was treated with antibiotics and a stent was then implanted. Endovascular therapy using stents is a safe and effective treatment option for aortic coarctation in patients with Turner syndrome. (Korean J Med 2015;89:331-334)
이남희 ( Nam Hee Yi ),박승운 ( Seung Woon Park ),박인성 ( In Seong Park ),박치환 ( Chi Hwan Park ),이충원 ( Choong Won Lee ) 대한류마티스학회 2015 대한류마티스학회지 Vol.22 No.1
Relapsing polychondritis is an uncommon disease associated with inflammation in cartilaginous tissues throughout the body, particularly affecting the cartilaginous structures of ears, nose, joints, and respiratory tract. Several autoimmune diseases, including vasculitis, are associated with the concurrent relapsing polychondritis. However, ankylosing spondylitis primarily affecting the sacroiliac joints and spine is rare in patients with relapsing polychondritis. We report on a 54-year-old man with concurrently relapsing polychondritis and ankylosing spondylitis. (J Rheum Dis 2015;22:56-60)
지치환,김갑수,박순진 龍仁大學校 武道硏究所 1997 武道硏究所誌 Vol.8 No.2
The objective of this study consists in inquiring in to herpetology, plasma protein, and chemical changes in lithicaacid, and the resultant findings are revealed, as follow: 1. Herpetology 1) Red Blood Cell (RBC) Red blood cells show the lowest value at rest, 4.51 count/mm3, in the athlete group, while the highest value right an after an exercise,4.76 count/mm3. The results of t-tests both an rest and right after an exercise do not present any significant difference. 2) White Blood Cell (WBC) White blood cells show the lowest value at rest, 5.67 count/mm3 in the non-athlete group, while the highest value right after an exercise, 12.9 count/mm3 in the athlete group. The results of t-tests do not represent any significant difference between the two groups at rest, but a significant difference right after an exercise by the t value of 9.3114. 3) Hemoglobin Hemoglobin presents 16.2 g/dl at rest in the non-athlete groups, 14.8 g/dl at rest in the athlete group, while it shows 17 g/dl right after an exercise in the non-athlete group, and 15.5 g/dl in the athlete group. However, it shows a 9.46% higher at rest and a 9.68% higher value right after an exercise in the non-athlete group, as compared with that of the athlete group. 4) Hematocrit Hematocrit exhibits 41.8% at rest in the non-athlete group, 45% at rest in the athlete group, whereas 45.7% right after an exercise in the non-athlete group, 43.8% in the athlete group. This reflects a 7.6% higher at rest and 4.34% higher value right after an exercise. In consequence, herpetology before and after Harvard step tests conducted on the national level Taekwondo champions and general students shows in general higher values right after an exercise than at rest in both the athlete and non-athlete groups. These results indicate that Taekwondo champions have better aerobic ability than the general students. But it is recommened that more studies should be conducted, expecially on comparison of Taekwondo champions' aerobic strength with that of the general students.