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김한석,김훈용,김대중,이종악,Kim, Han-Suk,Kim, Hoon-Yong,Kim, Dae-Jyung,Lee, Jong-Arc 한국전기전자학회 1999 전기전자학회논문지 Vol.3 No.2
본 논문에서는 CDMA 방식 중계기용 전력증폭기의 선형특성을 향상시키기 위해 기존의 전치왜곡 방식과 전방귀환 방식을 혼합한 전력증폭기를 설계 제작하였다. CDMA방식의 이동통신 시스템은 기존의 아날로그 셀룰라 방식과는 사용 스펙트럼 대역폭이 훨씬 크며 증폭기의 비선형성에 의한 채널사이의 혼변조 왜곡을 충분히 제거하여야만 통신이 가능하기에 선형성이 우수한 전력증특기가 필수적으로 요구된다. 본 논문에서 제작한 전력증폭기는 37dBm, 2-tone 인가시의 IMD 특성이 -50dBc로써 나타났으며, 불요방사 특성도 IS-95 기준을 만족하는 $fc{\pm}\;885kHz$에서 약 -46dBc, $fc{\pm}\;1.98MHz $ 에서는 약 -52dBc로 나타났다. In this paper, a new type of linearization technique proposed, in which the predistortor was added to the feedforward linearizer. As the input power level is applied to HPA, the gain and phase characteristics of the amplifier are also varied. By using of the predistorter the amplitude imbalance and phase imbalance is kept constant. Experimental results are present for Korea PCS frequency band. The center frequency of the feedforward amplifier is 1.843.75 MHz with 1.23 MHz bandwidth. The 2-tone intermodulation distortion at 37dBm output power is about -50dBc, and spurious emission are -46dBc at $fc{\pm}\;885KHz\;and\;-52dBc\;at\;fc\;{\pm}1.98MHz$, respectively.
산소부화연소에서 Co<sub>2</sub> 첨가에 대한 연소 특성
김한석,김호근,안국영,김용모,Kim, Han-Seok,Kim, Ho-Keun,Ahn, Kook-Young,Kim, Yong-Mo 대한기계학회 2004 大韓機械學會論文集B Vol.28 No.1
$CO_2$ is a well-known green house gas as well as the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. Among the method for reducing $CO_2$ emission, oxygen-enriched combustion has been proposed. Because its adiabatic flame temperature is relatively too high, existing facilities must be changed or the flame temperature in the combustion zone should be reduced. The combustion characteristics, composition in the flame zone, temperature profile and emission gases were investigated experimentally for the various oxygen-enriched ratios(OER) by the addition of $CO_2$, under constant $O_2$ flow rate. Results showed that the reaction zone was quenched and broadened as the addition of $CO_2$ was increased. The emission of NOx in flue gas was decreased as decreasing temperature in reaction zone. It was also shown that the reaction was delayed by the cooling effect. As the addition of $CO_2$ was increased, the composition of CO in the flame zone was increased due to the increase of reaction rate by increasing mixing effect of oxidant/fuel at OER=0%, but the composition of CO was decreased by quenching effect at OER=50% and 100%.
타액선 종양에서 종양증식 관련인자 발현에 관한 면역조직화학적 연구
김한석,김성민,박영욱,Kim, Han-Seok,Kim, Soung-Min,Park, Young-Wook 대한악안면성형재건외과학회 2007 Maxillofacial Plastic Reconstructive Surgery Vol.29 No.5
Objective : Lots of papers have revealed that tumor growth related factors such as EGF, EGFR, c-erbB-2 play an important role in tumorigenesis and proliferation. These factors are found in most tumors of ectodermal origin. But, documentations of tumor growth related factors on salivary gland tumors were rare. Therefore, we determined expressions of tumor growth related factors; PCNA, p53, EGF, EGFR, cerbB2(HER-2), Maspin, DMBT-1, N-Ras in representative salivary gland tumors. Materials and methods : A few types of salivary tumors were examined by immunohistochemical assays. Each antibody was applied to specimens of tumors. Specimens were composed of 5 pleomorphic adenomas (PA), 3 mucoepidermoid carcinomas (MEC), 2 adenoid cystic carcinomas (ACC) and 2 squamous cell carcinomas (SCC) from 12 patients. One specimen was selected randomly as negative control. For evaluation of staining intensity, each stained sample was divided into 5 grade; no staining, obscure, weak staining, moderate staining, strong staining. Results : Strong expressions of PCNA were found in all tumors except of PA. EGF was expressed strongly in SCC, ACC sequently. But in both PA and MEC, EGF expression was weak. EGFR and c-erbB-2 expression showed similar patterns in all salivary gland tumor tissues. P53 showed weak expression generally in all salivary gland tumors. DMBT-1 was expressed in SCC rather than in ACC or in MEC. N-Ras showed weak expressions in all salivary gland tumors except of squamous cell carcinoma. Conclusion : Taken together, tumor growth related factors were expressed in salivay tumors as well as mucosal squamous cell carcinoma. Especially EGFR and c-erbB-2 could be candidates as diagnostic markers for estimating clinical grade of salivary gland tumors. But further studies with reliable methods will be needed to confirm the results of this study.
십전대보탕액(十全大補湯液)을 투여(投與)하여 가토간손상(家兎肝損傷)의 회복(回復)에 관(關)한 실험적(實驗的) 연구(硏究)
김한석,Kim, Han-Suk 대한한방내과학회 1976 大韓韓方內科學會誌 Vol.1 No.1
The SIB ZUN DAE BO TANG is one of the prevailing tonics appeared at first time on TAE PYUNG HOE MIN HAW ZE GUK BANG in Song’s dynasty and have been widely used up to now. To observe the metabolic effects of Thioacetamide from the SIB ZUN DAE BO TANG, the following experiment was performed. 1. The activation of G.O.T. and G.P.T. to blood serum have been decreased when Thioacetamide was administrated into the rabbit. 2. The coefficiency of the SIB JUN DAE BO TANG appears in 3 hours after administrate and it decreases gradually along with it’s time(1st, 2nd, 3rd day) but the coefficiency of the G.P.T. was more apparent on 2nd, 3rd and 5th day. 3. When administrating Thioacetamide, the total amount of cholesterol grows rapidly up to 3rd day and it continuously grows after the 3rd day. But when administrating SIB ZUN DAE BO TANG, the cholesterol amount in blood grows up to 3rd day, but it decreases gradually after it on the other day. The conclusion of the above experiments shows that the prescription (SIB ZUN DAE BO TANG) improves the metabolic deficiency and the recovery and remedy of diseases.
조현병 환자에서 불안자극에 대한 선택적 주의 편향과 환청과의 연관성 : 예비 연구
김한석,한진희,홍승절,정종현,임현국,김태원,엄유현,채정호,이경욱,서호준,Kim, Han-Suk,Han, Jin-Hee,Hong, Seung-Chul,Jeong, Jong-Hyun,Lim, Hyun-Kook,Kim, Tae-Won,Um, Yoo-Hyun,Chae, Jeong-Ho,Lee, Kyoung-Uk,Seo, Ho-Jun 대한불안의학회 2016 대한불안의학회지 Vol.12 No.1
Objective : This study was conducted to evaluate the relationships between selective attention bias for fear stimuli and hallucination in patients with schizophrenia Method : A total of 66 patients with schizophrenia admitted to psychiatry clinics were included in the study. Selective attention bias was measured by the dot-probe task. Patient symptoms were measured using the Positive and Negative Symptom Scale, Psychotic Symptom Rating Scale (PSYRATS), Korean version of the Scale to Assess Unawareness of Mental Disorder, and Clinical Global Impression-Severity scale. Results : Selective attention bias was correlated with the hallucination subscale of PSYTATS (r=0.268, p=0.029). No correlation was found between selective attention bias and other clinical measures. There was no significant difference, but a statistical trend was found (p=0.092) in hallucination severities between the biased and non-biased groups. Conclusion : The results suggest that selective attention bias for fear stimuli is associated with auditory hallucination. This preliminary study suggests the possibility of correlation between auditory hallucination in the psychotic domain and anxiety of the affective component.
PIN 다이오드를 이용한 C-Band 위상 변위기의 설계에 관한 연구
김한석,김훈영,이창식,이종악,Kim, Han-Suk,Kim, Hoon-Yong,Lee, Chang-Sik,Lee, Jong-Arc 한국전기전자학회 1999 전기전자학회논문지 Vol.3 No.2
본 논문에서 C-밴드 6-비트 변위기의 설계와 제작을 하였고 각 비트에 대한 설계 기술을 기술하였다. $5.625^{\circ},\;11.25^{\circ},\;22.5^{\circ}$ 그리고 $45^{\circ}$ 위상 비트는 부하선로 방식, $90^{\circ}$ 위상 비트는 하이브리드 결합 방식 그리고 $180^{\circ}$ 위상 비트는 가변선로 방식을 각각 마이크로스트립 구리 기판 위에 적용하였다. In this paper, a C-band 6-bit phase shifter is designed and fabricated and design techniques for each phase bit are represented. We applied the loaded line type to $5.625^{\circ},\;11.25^{\circ},\;22.5^{\circ}\;and\;45^{\circ}$ phase bits and the hybrid coupled type to $90^{\circ}$ phase bit and the switched line type to $180^{\circ}$ phase bit, respectively on a microstrip copper substrate.
연소용 공기중 $N_2$의 $CO_2$대체에 대한 연소특성 해석
김한석,안국영,김호근,이윤원,이창언,Kim, Han-Seok,Ahn, Kook-Young,Kim, Ho-Keun,Lee, Yun-Won,Lee, Chang-Eon 한국연소학회 2002 한국연소학회지 Vol.7 No.4
[$CO_2$] is a well-known greenhouse gas, which is the major source of global warming. Many researchers have studied to reduce $CO_2$ emission in combustion processes. The central method of low $CO_2$ emission is Oxygen/CxHy combustion. Theoretically Oxygen/CxHy combustion only produces $CO_2\;and\;H_2O$ and allows convenient recovery of $CO_2$. The combustion characteristics, flame stability, composition in the flame zone and temperature profile were studied experimentally for various compositions of oxidant by substituting $CO_2\;for\;N_2$ with the constant $O_2$ concentration. Results showed that flame became unstable due to the high heat capacity, low transport rate and strong radiation effect of $CO_2$ in comparison with those of $N_2$. The reaction zone was quenched and broadened, as the ratio of $CO_2\;to\;N_2$ was increased. The emission of NOx in flue gas decreased due to the decreased temperature of the reaction zone. As the conversion ratio of $CO_2\;to\;N_2$ was increased, the emission of CO and the higher temperature zone increased due to decrease of reaction rate by the a quenching effect.