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고속 디지털 전송 HDTV을 위한 자력등화기의 성능평가에 관한 연구
최인수,이수욱,송재철 三陟大學校 産業科學技術硏究所 2004 産業科學技術硏究論文集 Vol.9 No.1
This paper presents various blind equalization algorithms called CMA, DM-CMA, SGA-DM-CMA, MCMA, DM-MCMA and SGA-DM-MCMA. This paper discuss some of advantages or disadvantages provided by these algorithms before applied to the practical high-order QAM system. From the results of simulation, we can verify that all of these algorithms discussed in this paper operate very well, Among the vrious algorithms, SGA-DM-MCMA algorithm shows best performance in terms of ISI characteristics.
임종한,장성실,김성아,문재동,채창호,홍윤철,김수영,김진석,김영욱,한상환,이혜숙,원종욱,송동빈,하은희,강성규 대한산업의학회 2001 대한직업환경의학회지 Vol.13 No.2
기존의 특수건강진단과 작업환경측정을 통한 직업병 관리가 진폐증, 소음성난청 등의 소수 특정질환에 국한되고 실제 직업병 발생 규모 파악이나 신종 직업병의 발견에 한계를 보인다는 사실은 산업의학전문가들 사이에서도 공감을 이루고 있다. 미국과 영국 등에서의 직업성질환 감시체계에 대한 경험은 우리 나라의 직업성질환 감시체계 구축에도 새로운 자극제가 되면서, 1998년이후 인천, 대전, 여천, 구미, 부울경 지역에서 지역 직업성질환감시체계를 산업보건관리의 중요한 시스템으로 구축하려는 노력이 확산되고 있다. 새로이 구축되어지는 이들 지역 직업성질환 감시체계는 감시하고자 하는 대상질환, 활용 가능한 인적자원 및 자료원, 지역 의료체계의 특수성 등에 따라서 목적과 방법을 달리하면서 독특한 형태로 발전을 하고 있다. 각 지역단위 감시체계들이 그 상황에 맞게 독특한 목적과 전략들을 발전 시키면서도, 향후 발전할 국가적인 차원의 직업성질환 감시체계 구축을 위하여 직업성질환 감시의 기본 전략 등을 공유하는 등의 노력이 필요하다. 환례 정의 및 기본적인 등록 서식의 공유, 직업성질환 감시 자료원의 발굴, 공동의 정보 네트워크 및 직업성질환 감시 데이터베이스 구축 등 직업성질환 감시활동을 지원하기 위한 여러 기초 인프라 구축에 힘을 모아야 할 것이다. 우리 나라에서 직업성질환 감시체계를 성공적으로 구축하기 위해서는 수집된 자료의 질 관리를 위한 직업성질환 감시의 원칙 제정과 감시 전략의 공유 등이 필요하며, 전국적인 직업성질환 감시체계의 하부구조라고 할 수 있는 지역감시체계의 기초 토대 마련과 강화작업이 절실하게 필요하다.
김영호,송민석,윤영진,박찬욱,이재열 嶺南大學校 工業技術硏究所 2003 工業技術硏究所論文集 Vol.31 No.1
The glass systems of SiO_2-Al_2O_3-B_2O_3-K_2O were fabricated with the composition of SiO_2 65∼76wt%, B_2O_3 20∼30wt%, Al_2O_3 0.3∼4.5wt%, and K_2O 0.5∼2.5wt% for mother glass of high frequency chip inductor. The glasses were prepared by quenching the melt from 1500℃ and analyzed by X-ray diffraction. The specimens were prepared with composites of ball milled glasses powder mixed with 0∼50wt% of alumina powder. After heat treating at 850℃∼950℃, sintering behaviors were observed by measuring the density of specimens as a function of temperature and the amount of alumina. Dielectric constants and dissipation factors were evaluated with HP-4192A as well as other crucial properties such as strength, softening point and thermal expansion. The density, dielectric constant and dissipation factor of specimen were 2.61g/㎟, 5.9∼6.2 and 0.0013∼0.0016 at 1㎒, respectively.
소화성 궤양에서 저용량 Clarithromycin 삼제요법의 Helicobacter pylori 박멸률
이상우,권오상,이구,이홍식,김창덕,진윤태,최재현,엄순호,류호상,전훈재,송치욱,허병원,김광희,현진해 대한소화기학회 1999 대한소화기학회지 Vol.34 No.1
Background/Aims: A clear therapeutic regimen for the optimal treatment of Helicobacter pylori (H. pylori) infection has not emerged. We evaluated the eradication rate and side effects of triple regimen with low-dose clarithromycin (0.5 g/day). Methods: One hundred and one patients with duodenal ulcer (n=72), gastric ulcer (n=19), or combined duodenal and gastric ulcer (n=10) were enrolled. H. pylori infection was assessed by histology and rapid urease test before therapy and 4-6 weeks after finishing the treatment of triple regimen. Patients were treated either with omeprazole 20 mg b.d., amoxicillin 1.0 g b.d. and clarithromycin 250 mg b.d. (OAC; n=66) or with omeprazole 20 mg b.d., metronidazole 500 mg b.d. and clarithromycin 250 mg b.d. (OMC; n=35) for 2 weeks. Follow-up endoscopy was performed on 60 patients (OAC; n=41, OMC; n=19). Side effects were evaluated after completion of therapy. Results: Eradication rate of OAC group was 85.4% and that of OMC group was 78.9%. Side effects were observed in 18.2% of the OAC group and 17.1% of the OMC group. Conclusions: Both triple regimens have low rates of side effects. OAC regimen with low-dose clarithromycin shows slightly higher eradication rate of H. pylori than OMC regimen.
이상우,김윤환,이재원,김경수,박미라,박동규,이성준,이구,김광희,김창덕,최재현,류호상,전훈재,송치욱,서성옥,엄숭호,현진해,진윤태 대한간학회 1998 Clinical and Molecular Hepatology(대한간학회지) Vol.4 No.4
Background/ Aims : Cases of small hepatocellular carcinoma (HCC) have been increasing with the progress of diagnostic methods . In t his study the screening methods for early diagnos is of HCC were re-evaluated, and comparative ther apeutic analyses were perfomed. Methods : A total of 110 pat ients with small HCC ($lt; 5 cm and $lt; 4 nodules ) were retrospectively analyzed. The patients were divided into four treatment groups ; unt reated group (No T x, n=12), transarterial-oily-chemoembolization group (TOCE, n=43), combined treatment group of percutaneous ethanol injection and TOCE (CEI, n=22), OP group ( OP, n=33). Results : Small HCC occupied 22.6% of t ot al HCC cases . Only one thir d of small HCC cases were detected during the regular screening. In this group, Alpha- fet oprotein as say pr ovided a diagnostic clue in 50% of cases, ultras onography in 71%, and the combination of both in 88%. Five year s ur vival rat e and 5- year non- recurrence rate in small HCC was 29% and 37% respectively. Comparative ther apeutic analys es showed t hat CEI and OP gave a bet t er s ur vival t han T OCE in Child gr ade A. CEI prolonged survival in Child grade B wher eas TOCE did not . Only TOCE was tried and did not improve the survival in Child grade C. Conclus i on : 1) A more strict screening is needed in high risk group of HCC. 2) As a first line of treatment in small HCC, OP or CEI can be selected in Child grade A, and CEI in Child grade B. In Child grade C, a less invasive treatment (PEIT , microwave coagulat ion therapy) should be investigated. (Korean J Hepatol 1998;4:365 380)
이정환,김영선,이상우,이재원,김광희,김창덕,최재현,엄순호,류호상,전훈재,송치욱,현진해,진윤태,김윤홍,허병원,강창돈 대한간학회 2000 Clinical and Molecular Hepatology(대한간학회지) Vol.6 No.2
Background/Aims: Lamivudine has demonstrated a potent suppression of viral replication and a substantial histologic improvement in many patients with chronic hepatitis B. This study is intended to evaluate the effects of lamivudine and the breakthrough rate in patients with HBV associated chronic liver diseases including decompensated liver cirrhosis, and to investigate the clinical factors closely related with these events. Methods: A total of 58 patients(chronic hepatitis 21, cirrhosis 37) showing abnormal serum levels of aminotransferase and detectable serum HBV DNA for at least 6 month received 150 mg of lamivudine once a day for 3-27 months (median 13). The Kaplan-Meier methods and the Cox regression model were used for statistic analysis. Results: The one-year cumulative incidences of the negative conversion of serum HBV DNA, normalization of aminotransferase, and seroconversion of HBeAg were 98.3%, 86.2% and 20.6%, respectively. Eighteen-month and 2-year cumulative breakthrough rates were 24% and 47%, respectively. The Child-Pugh scores were improved (p$lt;0.001) in patients with decompensated liver cirrhoses(n=21). The negative conversion of HBV DNA, breakthrough rates and seroconversion were not significantly associated with the progression of disease, mutation in pre-core region and previous treatment with interferon. The pre-treatment aspartate aminotransferase (AST) level was associated with a higher rate of seroconversion(p$lt;0.03). Conclusion: Despite a higher breakthrough rate, 2-year lamivudine treatment has induced the seroconversion of HBeAg in 26% of patients, and improved the clinical manifestations in decompensated cirrhotic patients.(Korean J Hepatol 2000;6:172-186)
성인의 간에 발생한 미분화 육종: 증례 보고 및 국내 문헌고찰
이상우,이성준,이구,이광희,이홍식,김창덕,진윤태,최재현,엄순호,류호상,전훈재,송치욱,현진해 대한간학회 1998 Clinical and Molecular Hepatology(대한간학회지) Vol.4 No.3
Undifferentiated sarcoma is one of the rare primary malignant tumor of the liver typically occur ring in later childhood. It has also been referred to embryonal sarcoma or malignant mesenchymoma. In Korea, three child and two adult cases have been reported to date in literature. We experienced a case of undifferentiated sarcoma in a 65- year- old female who presented with abdominal pain and right upper quadrant mass . Contrast-enhanced abdominal CT scan revealed a well demarcated mass with low attenuation and septation at left lobe of the liver and the mass showed hypovascular pattern on hepatic angiography. On cross section, the tumor was well demarcated from the adjacent liver by a fibrous pseudocapsule and showed cystic degeneration. Pathologically, the tumor was consistent with an undifferentiated sarcoma of the liver . (Korean J Hepatol 1998;4:283 289)
Measurement of Indoor Air Quality for Ventilation with the Existence of Occupants in Schools
Jai-Kwon Lee,Young-Chull Ahn,Chang-Shin Yeo,Sang-Hyun Byun,이재근,Tae-Wook Kang,Kam-Gyu Lee,Hyo-Soon Park,Hee- Soo Shin 대한기계학회 2005 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.19 No.4
This paper evaluates the performance of ventilation for the removal of indoor pollutants as a function of ventilation rate and the number of occupants in a test room and school classroom. An experimental apparatus consists of a test room, a tracer gas supply system, a gas detector, and a fan for ventilation air supply with a controller. The ventilation performance is evaluated in a step-down method based on ASTM Standard E741-83 using CO2 gas as a tracer gas in the test room of 35 m3. For the ventilation air flow rate of 1.0 ACH, a recommended ventilation flow rate of Korea school standard for acceptable indoor air quality in the case of one person, CO2 gas concentration decreases up to 55% within 50 minutes without occupancy and increases up to 75% in the case of one occupant. Also indoor air quality at the school classroom is investigated experimentally.