4륜 조향 차량의 주행성능 개선을 위한 제어기 설계에 관한 연구

손주한(Ju Han Sohn),최성욱(Sung Uk Choi),이영진(Young Jin Lee),이진우(Jin Woo Lee),이권순(Kwon Soon Lee) 대한전기학회 2000 대한전기학회 학술대회 논문집 Vol.2000 No.7

이종 네트워크간의 QoS 보장을 위한 버퍼관리 방안

손주항(Ju-hang Sohn),이효준(Hyo-jun Lee),안진섭(Jin-sub Ahn),김민택(Min-taig Kim),한준수(Jun-su Han) 한국통신학회 2006 한국통신학회 학술대회논문집 Vol.2006 No.7

PMBOK 프로세스 연관도와 네트워크 토폴로지 특징에 관한 비교

손주항(Ju-Hang Sohn),김민택(Min-taig Kim),정동수(Dong-Soo Jung),한정안(Jung-Ahn Han) 한국정보과학회 2012 한국정보과학회 학술발표논문집 Vol.39 No.1B

효율적으로 일하는 방법을 제시하는 프로젝트 관리 프레임 중의 하나인 PMBOK는 9가지 프로젝트 관리 영역의 필요성을 제시하고 있다. PMBOK 프로세스 연관도를 살펴보면, 네트워크 토폴로지의 특징인 노드, 링크, 순위, 빈도수와 관련된 유사한 면이 있는 것을 발견할 수 있다. PMBOK의 표준 프로세스 연관도에 따라 연결되는 링크를 순차적으로 그린다고 가정했을 때, 실제 업무의 프로세스 링크는 네트워크이론의 Power-law를 따를 것이라고 예상되었다. 이러한 현상을 증명하기 위해 PMBOK 표준 프로세스 연관도를 모델로 하여, 인터넷 위상의 특징을 결정하는 속성 중 Power-law1, 2의 관련성을 분석하였다.

이동형 전파측정시스템에서 슬립링을 적용한 방향탐지 안테나 마스트 회전 방법에 관한 연구

손주항(Ju-Hang Sohn),한인성(In-Sung Han),김덕중(Duck-Joong Kim) 한국산학기술학회 2017 한국산학기술학회논문지 Vol.18 No.10

이동형 전파측정시스템은 차량 탑재형으로, 단독임무수행이 가능하도록 설계되었다. 이동측정의 업무 특성상 기동성 확보가 필요하며, 이를 위해서는 안테나의 배치와 매립 방법에 대해 고려할 필요가 있다. 본 논문에서는 이동형 전파측정시스템의 방향탐지 정확도 측정방법개선을 위한 설계를 소개한다. 서보모터(Servo Motor)와 슬립링(Slip-Ring)을 활용하여 방향탐지안테나 마스트를 자체적으로 360도 회전하는 방법에 대해 분석하였고, 기동성과 내구성을 고려했을 때 슬립링을 활용하여 마스트를 회전시키는 방법으로 설계하였다. 이러한 설계를 통해 방향탐지 정확도 측정방법에서 턴테이블(Turn-Table)이 필요 없게 되어 지역적 의존성을 제거하였다. 즉, 전파무반사환경을 충족하는 챔버나, EUT를 공중에 매달리게 만든 후 시험을 수행할 필요가 없어지게 된다. 또한 턴테이블상의 피실험체의 영점조정 및 피실험체의 마운트 절차가 단축되어 생산성의 향상을 꾀할 수 있다. 내구성 강화를 위해 RF케이블 조립체를 마스트 내부로 포선하는 방법을 사용하였고, 설계내용에 따라 RF케이블의 길이가 짧아지는 효과로 인해 케이블 손실의 개선효과를 볼 수 있다. 또한 같은 현상으로 인해 시스템 전체의 무게가 줄어들어 기동성의 향상도 꾀할 수 있다. A Mobile Radio Wave Measurement System (MRWMS) is a vehicle-mounted system designed to be operating in a single mission. The mission characteristic for mobile measurement requires mobility. For this, we must consider the arrangement and embedded method of MRWMS"s antennas. In this paper, we described the measurement method design of direction detecting accuracy for MRWMS and designed the direction finding antenna mast capable of rotating itself by using a slip ring without turntable for Direction Finding (DF) accuracy test. As we removed the dependency of a limited local area by designing a measurement method of direction detecting accuracy, Equipment Under Test (EUT) zero-Adjustment and mounted process shortened. So, we the reduced production costs. We expect an improved cable loss value by shortening the RF cable length in accordance with our design. In addition, due to the same phenomenon, the entire system is lighter and the mobility is improved

만성 혈액투석 환자에서의 대사성 산혈증과 음이온차의 양상

손정일(Chong Il Sohn),김병훈(Byoung Hun Kim),신진호(Jin Ho Shin),양석철(Suck Chul Yang),박용수(Yong Soo Park),한동수(Dong Soo Han),안명주(Myung Ju Ahn),손주현(Ju Hyun Sohn),이인홍(In Hong Lee),김순길(Soon Kil Kim),이정희(Jung Hee Lee 대한내과학회 1996 대한내과학회지 Vol.51 No.2

N/A Objectives: The aim of the present study is to evaluate the prevalence of the various patterns of metabolic acidosis and anion gap among chronic hemodyalysis patients. Methods: Analysis of predialysis arterial blood gases and anion gap patterns was performed in 67 stable chronic outpatient hemodialysis patients(>1 year) with acetate buffer. Blood samples were drawn from the arterial line of the atreriovenous fistula for determination of blood electrolytes, chemistries, and analysis of blood gases at the beginning of hemodyalysis. Results: The degree of metabolic acidosis was mild to moderate with mean pH 7.33±0.039. 82% of a total 67 patients had pH between 7.30 and 7.39 with 18% of them between 7.20 and 7.29. Simple as mixed metabolic acidosis was shown in 49 of 67 patients(73%) and 18 of 67 patients(27%), respectively. In comparison of both groups, the group with mixed metabolic acidosis had significantly lower pH(7.29±0.04 vs 7.34±0.03, p<0.001) with higher pCO₂(38.5±3.4, p<0.005) and anion gap(19.6±4.1 vs 17.6±2.9, p<0.05). The classical high anion gap of end stage renal disease (range, 16 to 29 mEq/L) was also noted in 20 of 67 patients(30%). The linear regression analysis between anion gaps and total serum carbon dioxide contents (TCO₂) didn't show any significant correlation in all patients as well as the two subdivided groups with high and normal anion gap. Furthermore, only 13 of 67 patients(20%) were included between 80 and 120% in the ratio of delta anion gap(ΔAG) over delta TCO₂(dTCO₂). Therefore, the majority of hemodialysis patients (80%) showed the discrepancy between the degrees of d AG and ΔTCO₂. The analysis of unmeasured cations(K, Ca) and anions(albumin, phosphate) in the calculation of anion gap(Na ?Cl ?HCO₃) between two groups of high and normal anion gap of all patients as well as 49 patients of simple metabolic acidosis didn't reveal any discernible contributions to the changes of anion gap. Conclusion- This study therefore showed that the mixed acid-base balance and normal anion gap metabolic acidosis is not an exception in chronic stable hemodialysis patients. Also, the impact of hemodialysis in end stage renal disease patients seemed to lead the changes in values of unidentified anions besides fixed mineral acids and/or in those of unrecognized ionic equivalents of plasma constituents.

고지대에서의 전파도달범위 분석을 위한 실측 데이터 기반 전파도달 상관관계 분석모델 연구

한인성(In-Sung Han),손주항(Ju-Hang Sohn),박무성(Moo-Sung Park) 한국산학기술학회 2016 한국산학기술학회논문지 Vol.17 No.5

최근 기업과 개인 및 그 외 다양한 분야에서 고속 무선 통신기술의 수요가 증가함에 따라 최적화된 서비스를 계획하 기 위해 전파의 도달범위에 관한 많은 연구들이 진행되고 있으나, 접근이 제한되는 고지대의 경우는 전파를 실측하고 도달범 위를 분석하는데 많은 제한이 되고 있다. 신규 서비스들의 원활한 통신 서비스를 제공하기 위해서는 다양한 전파 환경에서 폭넓은 주파수 대역을 바탕으로 하는 조건(전파 모델의 선택, 주파수 대역에 따른 보정 값 등)이 고려되어야 한다. 특히 전파 환경이 복잡해짐에 따라 각 주파수 대역에 대한 지역별 전파 환경의 측정, 조사를 통하여 실시간 전파 스펙트럼의 변화 등을 조기에 감지함으로써 적절한 대책을 수립할 수 있어야 한다. 이를 위해서는 실시간 스펙트럼 분포 상태 조사를 통해 지역별 전파 환경 기초 자료의 확보가 필요하며, 전파 측정 데이터의 저장 및 분석을 통한 추후 문제 발생 시 빠른 대책 수립이 가능해야한다. 본 논문에서는 신뢰성 있는 전파도달범위를 분석 및 예측을 위해 HTZ Warfare를 이용하여 접근이 제한되는 국내 각 고지대 지역에서 실측 전파데이터를 수집하고, 예측된 데이터와 비교하여 상관관계 분석을 수행하였다. 또한 주파수 별, 전파모델별 분석 및 시뮬레이션 실험을 통해 각 고지대에서 가장 적합한 전파 모델들을 비교 평가하였다. As the needs for fast wireless communication technology in various fields, including companies, individuals, etc., grows, many research projects related to the coverage of propagation are being carried out for plaining optimized communication services. On the other hand, there are some limitations in surveying and analyzing propagation in highland areas. To provide a better communication service of a new service, a range of radio environment conditions based on a wide radio bandwidth (selection of propagation model, correction of value in accordance with radio bandwidth, etc.) should be considered. In particular, radio environment conditions are becoming increasingly sophisticated. By the early detection of real-time changes in the radio spectrum, which is based on an examination and research of regional occupied band width condition, proper measures should be established. To make a proper solution of above, the basic real-time analysis of spectrum distribution status by regional groups is necessary. In addition, the establishment of prompt measures should be enable by stored or analyzed radio data. In an attempt to predict reliable propagation coverage, this thesis examines the limited propagation data with HTZ Warfare, which were collected from domestic high land sites faced with limited access. Furthermore, a comparative result value evaluation for an optimized propagation model was performed through testing simulations, and frequency-dependent and propagation model-dependent analysis.

비전 센서를 이용한 AGV의 주행정보 획득에 관한 연구

이진우(Jin Woo Lee),손주한(Ju han Sohn),최성욱(Sung Uk Choi),이영진(Young Jin Lee),이권순(Kwon Soon Lee) 대한전기학회 2000 대한전기학회 학술대회 논문집 Vol.2000 No.7

약물 중독 시 위 세척에 의한 산 - 염기 평형 및 전해질의 변화

윤형란(Hyung Ran Yun),손동현(Dong Hyun Sohn),이창범(Chang Bum Lee),이재웅(Jae Woong Lee),양석철(Suck Chul Yang),한동수(Dong Soo Han),손주현(Ju Hyun Sohn),김순길(Soon Kil Kim),김호중(Ho Jung Kim) 대한내과학회 1998 대한내과학회지 Vol.54 No.4

N/A Objectives: There is little information on the imbalance of electrolyte and acid-base metabolism associated with gastric lavage in acute drug intoxication patients. This study was aimed to analyze the acid-base and electrolyte abnormalities associated with gastric lavage in acute drug intoxication patients. Methods: We studied 24 acute drug intoxication patients who had performed gastric lavage with 10 liters of 0.9% NaC1. Electrolyte parameters and arterial blood gas analysis were carried out before and after gastric lavage. Results: After gastric lavage, acidosis was reduced in general. But there was no significant change in pH (7.34±0.02 vs. 7.38±0.15, p=NS). In acid-base balance, the mixed form of metabolic acidosis and respiratory acidosis was reduced from 7 to 2 cases, and the simple form of respiratory acidosis was reduced from 3 to 1 case. In contrast, normal form was increased from 5 to 7 cases and the simple form of metabolic acidosis was increased from 2 to 6 cases. In electrolyte parameters, serum sodium was reduced significantly (145±1.0 mEq/L vs. 141±0.8 mEq/L, p<0.01), but there was no case of significant hyponatremia (<135mEq/L). Bicarbonate level (20±1.1 mEq/L vs. 22±0.9 mEq/L, p< 0.05) and anion gap (19±1.6 mB vs. 13±1.3 mEq/L, p< 0.01) showed significant change. But, blood levels of potassium (3.6±0.1 mEq/L vs. 3.8±0.1 mEq/L, p=NS), chloride (106±0.6 mEq/L vs. 106±0.6 mEq/L, p=NS) and F'aCO2 (36±1.mmHg vs. 37±1.5 mmHg, p=NS) were no significant change before and after gastric lavage. Conclusions: Gastric lavage with 10 liters of 0.9% NaC1 in acute drug intoxication patients did not show clinically significant changes in electrolytes and acid-base balance.

감염증에서 위점막의 Toll-like Receptor 4 발현

박준용 ( Joon Yong Park ),한동수 ( Dong Soo Han ),김보현 ( Bo Hyun Kim ),강은경 ( Eun Kyung Kang ),이영춘 ( Ying Chun Li ),이항락 ( Hang Lak Lee ),김진배 ( Jin Bae Kim ),손주현 ( Joo Hyun Sohn ),최호순 ( Ho Soon Choi ),강정옥 ( Ju 대한소화기학회 2003 대한소화기학회지 Vol.41 No.3

Background/Aims: Toll-like receptors (TLRs) represent a pattern recognition receptors with an ability of specific recognition of pathogens. TLRs appear to respond to pathogens and induce NF- kB activation. TLR2 and 4 seem to be related to the initiation of immune response against gram negative and positive bacteria. We investigated the effect of Helicobacter pylori (H. pylori) infection on the expression of TLRs on the gastric mucosa. Methods: For 35 endoscopic gastric mucosa samples, histologic grading of H. pylori infection and inflammatory cell infiltration were performed. The mRNA expression of TLR2, 3, and 4 was examined by RT-PCR. Immunohistochemistry demonstrated the distribution of TLR2 and 4 in gastric mucosal biopsies. Results: H. pylori positive gastric mucosa expressed higher TLR4/GAPDH ratio than H. pylori negative gastric mucosa (p=0.035), while no significant difference in the expression of TLR2 and 3 was detected (p=0.129, p=0.176). The severity of neutrophil infiltration showed a significant positive correlation with TLR4/GAPDH ratio (p=0.045, r=0.342). Immunohistochemistry using anti-TLR4 and anti-TLR2 antibody revealed the expression of TLR4 in the epithelial cells of H. pylori-infected gastric mucosa. Conclusions: H. pylori infection induces TLR4 expression in the human gastric epithelium, which suggests a certain role of TLR4 in the mucosal inflammatory reaction to H. pylori infection. (Korean J Gastroenterol 2003;41:171-176)

응급 내과환자의 저나트륨혈증

정자헌(Ja Hun Jung),손동현(Dong Hyun Sohn),박준용(Joon Yong Park),오광택(Kwang Taek Oh),한동수(Dong Su Han),양석철(Suck Chul Yang),손주현(Ju Hyun Sohn),김순길(Soon Kil Kim),김호중(Ho Jung Kim) 대한내과학회 1996 대한내과학회지 Vol.51 No.4

N/A Objectives: Hyponatremia is the most common finding of electrolyte disorder in patients admitted to medical ward. It is suggested that the prognosis of patients with hyponatremia is worse than that with normal sodium concentration in morbidity and mortality. We performed the study to evaluate the incidence and cause of hyponatremia in inpatients admitted to medical ward via emergency room with prospective study. Methods: Hyponatremia was defined as a serum sodium concentration equal to or less than 134 mEq/L. A total 225 medical patients were prospectively studied for 45 days. Other chemistry and electrolytes of blood and urine were determined within 24 hrs following admission. Results: 1) Of medical inpatients through emergency room, hyponatremia was detected in high frequency (16%) and mild hyponatremia (125-134 mEq/L) was showed in 90% or more. 2) The most common cause of hyponatremia was decreased effective circulating blood volume group (76%), and its common underlying disease was liver disease. 3) Compared to other groups, the group with decreased effective circulatory volume showed significant decrease in spot urine sodium concentration, fractional excretion of uric acid and serum creatinine concentration. 4) There was no correlation between serum concentration of hyponatremia and other parameters associated with it. As it was corrected, no significant simultaneous changes on BUN and serum uric acid concentration was noted. Conclusion: Interpretation of this data depend on not decreased circulatory volume but also other compounding factor as production and excretion of which is related to underlying variable disease.