Cellular/PCS 대역용 이중대역 안테나 설계

김선경,최석호,박종권 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1

본 논문에서는 Cellular(824-894MHz), PCS(1750-1870MHz)용 이중대역 모노폴 안테나를 설계하였다. 평면 모노폴을 3차원 구조로 구부린후, 이중대역의 공진을 위해 구부러진 모노플에 여러 슬릿을 첨가하였다. 제안된 안테나는 약2.25의 주파수 비율을 가지고, VSWR 2:1을 기준을 하였으며 각각 152MHz(738-890MHz)의 190MHz(1740-1930MHz)의 대역폭을 얻었다. In this paper, we have designed dual-band planar monopole antenna for Cellular(824-894MHz) and PCS(1750-1870MHz) application. The proposed antenna added slots in a vented planar monopole for dual-band resonance. The antenna bandwidth has 152MHz (738-890MHz) and 190MHz (1740-1930MHz) at VSWR 2:1, respectively.

CPW급전을 이용한 UWB 안테나 설계

최석호,이성훈,김학선,박종권 한밭대학교 정보통신전문대학원 2004 정보통신전문대학원 논문집 Vol.2 No.1

본 논문은 CPW급전 구조와 CST사의 Microwave Studio 사용하여 UWB 안테나를 설계하였다. 시물레이션 결과 제안된 안테나의 대역폭은 3.O5-13GHz를 가지고 방사패턴은 무지향성의 형태를 갖는 것을 보였다. In this paper, we have designed a UWB antenna using CPW feed line and used the Microwave Studio of CST to simulate the UWB antenna. Simulated results show that antenna bandwidth is 3.05-13GHz and radiation pattern is omni-directional.

H형 패치 안테나 설계

최석호,김학선,박종권 한밭대학교 정보통신전문대학원 2003 정보통신전문대학원 논문집 Vol.1 No.1

이 논문은 H형 패치 안테나가 무선통신에 적합하다는 것을 보여준다. H형 패치 안테나는 기존의 사각형 패치 안테나처럼 작은 크기, 적은 제작비용, 고조파 성분에서의 비 공진과 같은 몇 가지 장점을 가진다. H형 패치 안테나의 기본적인 이론과 설계과정 및 시뮬레이션 결과를 소개하였다. In this paper, H-shaped patch antenna suitable for wireless communication is presented. This antenna has several advantages compared to conventional rectangular microstrip patch antennas such as small size, low cost fabrication and absence of harmonic resonance. The fundamental principle, simulated result and design procedure are presented.

하수 2차 처리수 재이용을 위한 저압 및 중압 고도산화시스템의 성능평가

안규홍,안석,맹승규,김기팔,홍준석,정민우,권지향,Ahmed, Zubair 대한상하수도학회 2003 상하수도학회지 Vol.17 No.4

In the present study, the feasibility of UV/H₂O₂ systems was investigated using low and medium-pres sure lamps on biologically treated wastewater effluents for secondary effluent reclamation. Two types of UV lamps were used as the light sources (a 33W lowpressure mercury lamp and a 350-W mediumpressure mercury lamp). The results from these UV systems showed that the removal of organic compounds could be achieved in the contact time of longer than 30min (i.e., low UV doses). Efficiencies of color removal and disinfection were far better than those of organic matters measured as TOC, DOC and TCOD_(cr). In the low pressure lamp UV system, it has been found that DOC and color removals were 60.9 and 86.2% with 50㎎/L of H₂O₂ and contact times of 30 minute, respectively. Whereas, with the mediumpressure lamp UV system, TOC, DOC and color removal were 27.1, 5.6 and 95% with 14.3㎎/L of H₂O₂ and 14 minute of contact times, respectively. Both systems could be applied for the reclamation of secondary effluent treated with biological treatment processes.

양측성 관상동정맥루 1예

최용원,오석규,이재훈,이상재,권경희,최은경,김남호,정진원 圓光大學校 醫科學硏究所 2002 圓光醫科學 Vol.17 No.1

저자들은 호흡곤란, 흉부불쾌감, 심계항진 등을 주소로 내원한 환자에서 경흉부 및 경식도 심초음파 검사상 주폐동맥에서 이완기에 전행하는 지속적인 혈류의 흐름을 관찰하고, 관상동맥 조영술을 통해 좌전하행지 중간부위와 우관상동맥 근위부에서 각각 기시하여 공통경로를 이루면서 주폐동맥으로 유입되는 양측성 관상동정맥루를 보이는 드문 1예를 경험하였기에 문헌 고찰과 함께 보고하는 바이다. A coronary arteriovenous fistula is infrequently encountered vascular communication between a coronary artery and a cardiac chamber, a great artery or the vena cava. It is the most common congenital anomaly that can affect coronary perfusion. Bilateral involvement of coronary fistula constitutes an uncommon subgroup of coronary arteriovenous fistulas. A 69 year-old female patient presented with chest discomfort, palpitation, and dyspnea. In the echocardiography, doppler color flow imaging visualized abnormal flow signals with mosaic appearance in the main pulmonary artery during diastolic phase. Coronary angiography revealed arteriovenous fistula arising from the left anterior descending artery and the right coronary artery. Both coronary arteriovenous fistulas drained into the main pulmonary artery. We report a case of bilateral coronary arteriovenous fistula that was confirmed by echocariography and coronary angiography.

음경에 발생한 기저세포암 1예

이용주,최혜자,윤석권,김한욱,임철완 대한피부과학회 2004 大韓皮膚科學會誌 Vol.42 No.3

Basal cell carcinoma is the most common malignant skin cancer in Korea. The lesions are most frequently found in the head and neck region. But penile basal cell carcinoma is very rare and there are only 29 other reported cases. We report a rare case of basal cell carcinoma of the penis in a 76-year-old man. He had a well circumscribed 1.3㎝×1.3㎝ thick scaly plaque with central ulcer in right penile root area for 4 years. The lesion was completely excised and no recurrence for four months. (Korean J Dermatol 2004;42(3):350~352)

유두상 에크린 한선종 1예

최현성,이지현,윤석권,김한욱,임철완 대한피부과학회 2004 大韓皮膚科學會誌 Vol.42 No.3

Papillary eccrine adenoma is a rare benign sweat gland neoplasm. It occurs most often as a solitary nodule in women and is located predominantly on the distal portion of the extremities. This tumor is similar to tubular apocrine adenoma in histological and clinical aspects, so distinction of these tumors is still controversial. We report a case of two papillary eccrine adenomas developed on the left popliteal and calf area of a 58-year-old-man, this is the first report of the multiple papillary eccrine adenomas in Korea. (Korean J Dermatol 2004;42(3):353~355)

정신과 입원환자에서의 혈청 콜레스테롤 농도와 공격행동

전태연,도규영,정종현,권용실,김석범 大韓神經精神醫學會 1998 신경정신의학 Vol.37 No.5

목 적 : 혈청 콜레스테롤 농도와 자살 등의 공격행동간의 연관성에 관한 여러 연구가 있었으나 일치된 결과를 보이고 있지 못하다. 이에 저자들은 다양한 진단의 정신과 입원 환자들 중 공격행동을 보인 환자의 콜레스테롤 농도를 정상 한국 성인에서의 혈청 총 콜레스테롤의 성별, 연령별 평균 및 표준편차와 percentile분포에 맞추어 공격행동 및 자살시도와 혈청 콜레스테롤 농도간의 연관성을 알아보기 위하여 본 연구를 시행하였다. 방 법 : 본 연구는 1994년 1월 1일부터 1995년 6월 31일까지 18개월간 카톨릭대학교 의정부성모병원 정신과 병동에 입원하였던 환자 중 콜레스테롤 농도를 얻을 수 있었던 127명을 대상으로 하였다. 대상 환자는 공격행동의 유무에 따라 공격군과 비공격군으로 분류하여 공격군 35명과 비공격군 92명의 자료를 얻었으며, 공격군은 Overt Aggression Scale을 사용하여 평가하였다. 측정된 각 환자의 콜레스테롤 농도는 정상 한국 성인에서의 혈청 총 콜레스테롤의 성별, 연령별 평균 및 표준편차와 percentile분포에 맞추어 4개의 군으로 나눈 후 공격행동 발생비율, 자살시도간의 차이를 알아보았다. 또한 공격행동을 보인 군에서도 각 콜레스테롤군 간의 총 공격 점수를 비교하였다. 결 과 : 1) 각 콜레스테롤군 간의 공격행동 발생비율에는 유의한 차이가 없었다. 2) 공격군에서 각 콜레스테롤군 간의 총 공격 점수는 유의한 차이를 보이지 않았다. 3) 각 콜레스테롤군 간의 자살시도 빈도는 유의한 차이가 없었다. 결 론 : 정신과 입원 환자의 혈청 콜레스테롤 농도를 정상 한국 성인에서의 혈청 총 콜레스테롤의 성별, 연령별 평균 및 표준편차와 percentile분포에 맞추었을 때 혈청 콜레스테롤 농도와 공격행동 및 자살시도에 유의한 연관이 없었다. Objectives : An association between serum cholesterol concentration and violent behavior has been suggested, but has not been consistently demonstrated. This study was conducted in order to evaluate the relation between serum cholesterol concentration and violent behavior in psychiatric inpatients who had been admitted at Uijongbu St. Mary's Hospital, the Catholic University of Korea from January 1994 to June 1995. Methods : We divided the 127 subjects into violent(35 subjects) and non-violent group(95 subjects). According to the percentile distribution of serum total cholesterol in healthy Korean adults, the subjects were classified into four subgroups : Group 1, subjects Whose cholesterol concentrations were below 26% of percentile distribution, Group 2, from 26% to 50%, Group 3, 51% to 75% and Group 4, above 75%. In the four cholesterol subgroups, the authors examined the incidence of violent behaviors and suicidal attempts. Within the violent group, total aggression score of four cholesterol subgroups was compared. Results : 1) Among the four cholesterol subgroups, there were no significant differences in the violent behavior. 2) Within the violent groups, total violent score of the four cholesterol subgroups showed no significant difference. 3) Among the four cholesterol subgroups, there were no significant differences in suicidal attempt. Conclusion : When the serum cholesterol concentrations of psychiatric inpatient applied to the percentile distribution of serum total cholesterol in healthy Korean adult, no association was found between serum cholesterol concentration and violent behavior and suicide attempt.

A Prospective Nationwide Study of Drug-Induced Liver Injury in Korea :

Suk, Ki Tae,Kim, Dong Joon,Kim, Chang Hoon,Park, Seung Ha,Yoon, Jai Hoon,Kim, Yeon Soo,Baik, Gwang Ho,Kim, Jin Bong,Kweon, Young Oh,Kim, Byung Ik,Kim, Seok Hyun,Kim, In Hee,Kim, Ju Hyun,Nam, Soon Woo American College of Gastroenterology 2012 The American journal of gastroenterology Vol.107 No.9

A multicenter study of entecavir <i>vs.</i> tenofovir on prognosis of treatment-naïve chronic hepatitis B in South Korea

Kim, Seung Up,Seo, Yeon Seok,Lee, Han Ah,Kim, Mi Na,Lee, Yu Rim,Lee, Hye Won,Park, Jun Yong,Kim, Do Young,Ahn, Sang Hoon,Han, Kwang-Hyub,Hwang, Seong Gyu,Rim, Kyu Sung,Um, Soon Ho,Tak, Won Young,Kweon Elsevier 2019 Journal of hepatology Vol.71 No.3

<P><B>Background & Aims</B></P> <P>It is currently unclear which antiviral agent, entecavir (ETV) or tenofovir disoproxil fumarate (TDF), is superior for improving prognosis in patients with chronic hepatitis B (CHB). Here, we assessed the ability of these 2 antivirals to prevent liver-disease progression in treatment-naïve patients with CHB.</P> <P><B>Methods</B></P> <P>From 2012 to 2014, treatment-naïve patients with CHB who received ETV or TDF as a first-line antiviral agent were recruited from 4 academic teaching hospitals. Patients with decompensated cirrhosis or hepatocellular carcinoma (HCC) at enrollment were excluded. Cumulative probabilities of HCC and death or orthotopic liver transplant (OLT) were assessed.</P> <P><B>Results</B></P> <P>In total, 2,897 patients (1,484 and 1,413 in the ETV and TDF groups, respectively) were recruited. The annual HCC incidence was not statistically different between the ETV and TDF groups (1.92 <I>vs</I>. 1.69 per 100 person-years [PY], respectively; adjusted hazard ratio [HR] 0.975 [<I>p</I> = 0.852] by multivariate analysis). Propensity score (PS)-matched and inverse probability of treatment weighting (ITPW) analyses yielded similar patterns of results (HR 1.021 [<I>p</I> = 0.884] and 0.998 [<I>p</I> = 0.988], respectively). The annual incidence of death or OLT was not statistically different between the ETV and TDF groups (0.52 <I>vs</I>. 0.53 per 100 PY, respectively; adjusted HR 1.202 [<I>p</I> = 0.451]). PS-matched and ITPW analyses yielded similar patterns of results (HR 1.248 [<I>p</I> = 0.385] and 1.239 [<I>p</I> = 0.360], respectively). These findings were consistently reproduced in patients with compensated cirrhosis (all <I>p</I> >0.05).</P> <P><B>Conclusions</B></P> <P>The overall prognosis in terms of HCC and death or OLT was not statistically different between the ETV and TDF groups. Further studies are needed to validate our results.</P> <P><B>Lay summary</B></P> <P>It is currently unclear which antiviral agent, entecavir or tenofovir disoproxil fumarate, is superior for improving prognosis in patients with chronic hepatitis B virus infection. In this analysis we found that there was no difference in terms of overall prognosis, including risk of hepatocellular carcinoma, death, or the need for a liver transplant, in patients receiving either antiviral.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The hepatocellular carcinoma risk was not statistically different between the ETV and TDF groups. </LI> <LI> The death or liver transplant risk was not statistically different between the 2 groups. </LI> <LI> These results were consistently reproduced after adjusting for confounding variables. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>