TUP 코드의 지역 최적화 구현

백세용(Se-Yong Paek),박순동(Soon-Dong Park),원유헌(Yoo-Hun Won) 한국정보과학회 1992 한국정보과학회 학술발표논문집 Vol.19 No.2

지역 최적화는 컴파일러 후단분에서 튜플 형태이고 추상기계 대한 코드인 TUP 코드의 임시변수 수를 감소시킴으로써 전체 중간 코드의 크기를 줄이고, 실행 시간을 감소시킨다. 이렇게 함으로써 레지스터 할당과 기계어 코드 생성을 보다 효율적으로 수행할 수 있다. 본 연구에서는 지역 최적화 기법으로 중복 수식 제거(common subexpression elimination), 복사 전파(copy propagation), 상수 중첩(constant folding)을 사용하여 지역 최적화를 구현하였다.

VariantTM 이온교환 고성능 액체크로마토그래피법과 IMxR 이온포획 정량법을 이용한 Hb A10의 측정비교

백세연,전희선,곽연식,신옥현 대한임상검사정도관리학회 1995 臨床檢査와 精度管理 Vol.17 No.2

Developmental Models of Functional Maps in Cortex

백세범 대한의용생체공학회 2013 Biomedical Engineering Letters (BMEL) Vol.3 No.4

Functional maps are observed in various areas in the brain ofmany species and are considered as key features that revealthe working mechanism of neural circuits. One particularexample is the orientation preference map in the primaryvisual cortex (V1) in higher mammals, in which neuronsrespond selectively to the orientations of spatial componentsin visual stimuli. This cortical map has been studiedextensively for years because it is thought important tounderstand how sensory information is encoded and decodedin the cortical neural network. An important question raisedis how this map structure is created during early development,which has not been clearly answered for the past decades. Here I introduce the latest model views on this issue todiscuss the developmental mechanism of the orientationpreference maps, and more generally, how the developmentof the functional structure in the nervous system can beunderstood in mathematical model.

I발표장 : 촉매 및 반응공학2 ; I-55 : Adsorption and catalytic oxidation of volatile organic compounds on silver loaded hydrophobic zeolites

백세원,김정랑,임선기 한국화학공학회 2007 화학공학의이론과응용 Vol.10 No.1

To design a good combined adsorbent/catalyst dual functional system for the control of the lowconcentration VOC, both adsorption and catalytic activity test over metal loaded zeolite HY were carried out. Hydrophobic HY zeolite was selected as a good adsorbent candidate among the tested zeolite adsorbents and extended to the catalyst support material by adding various transition metals. The temperature programmed surface reaction (TPSR) of toluene and methylethylketone (MEK) suggested the silver as the best candidate among the tested transition metals. Temperature programmed reductions (TPR) and O2-temperature programmed desorption (O2-TPD) on Ag/HY catalysts were carried out to explain the nature of active centre of Ag catalyst for the toluene oxidation. Silver oxide species or partially oxidized metallic silver on to the surface of metallic silver phase was proposed as an active redox site during the oxidation reaction.

혈소판기능 측정기 Multiplate 지표의 한국인 참고치에 대한 기초 자료

백세연,홍지민,임영애 대한진단검사의학회 2013 Laboratory Medicine Online Vol.3 No.4

Background: The Multiplate analyzer (Dynabyte GmbH) has been recently introduced as a platelet function test for patients taking antiplatelet drugs. The study aimed at providing basic data for determining the reference interval of parameters produced by Multiplate in Koreans and to study the factors that influence those parameters. Methods: Blood was collected from 35 healthy volunteers (female 18, male 17) into tubes containing hirudin or 3.2% sodium citrate. Whole blood platelet aggregations triggered by adenosine-5’-diphosphate (ADP), ADP-high sensitive (ADP+PGE1 only in hirudin samples), arachidonic acid (AA), collagen or thrombin receptor activator peptide (TRAP) were investigated using Multiplate according to the manufacturer’s instructions. Data from healthy volunteers for the area under the curve (AUC) were determined from the central 95th percentile of the results. Results: The values of AUC in hirudin samples for all agonists were significantly higher than those in sodium citrate samples. The AUC values in hirudin (sodium citrate) samples were as follows: ADP 38-107 (18-119) U; ADP+PGE1 16-91 U; AA 64-156 (32-117) U; collagen 53-112 (26-108) U;and TRAP 81-163 (49-149) U. The parameters from Multiplate were significantly correlated with leukocyte counts, but not with hematocrit levels. Conclusions: Although our data were derived from only 35 subjects, the results are expected to be helpful in determining the reference interval at a single institute and may serve as basic data for future cumulative data of reference intervals from multiple institutes in Korea.

Relationship between the Severity of Diversion Colitis and the Composition of Colonic Bacteria: A Prospective Study

백세진,김선한,이창규,노경호,금보라,김철환,김진 거트앤리버 소화기연관학회협의회 2014 Gut and Liver Vol.8 No.2

Background/Aims: Diversion colitis is the inflammation ofthe excluded segment of the colon in patients undergoingostomy. It has been suggested that a change in colonic floramay lead to colitis; however, direct evidence for this diseaseprogression is lacking. The aim of this study was to evaluatethe relationship between the severity of diversion colitis andthe composition of colonic bacteria. Methsods: We used culturemethods and polymerase chain reaction to analyze thecolonic microflora of patients who underwent rectal cancerresection with or without diversion ileostomy. In the diversiongroup, we also evaluated the severity of colonoscopic andpathologic colitis before reversal. Results: This study enrolled48 patients: 26 in the diversion group and 22 in the controlgroup. Significant differences were observed between thetwo groups in the levels of Staphylococcus (p=0.038), Enterococcus(p<0.001), Klebsiella (p<0.001), Pseudomonas(p=0.015), Lactobacillus (p=0.038), presence of anaerobes(p=0.019), and Bifidobacterium (p<0.001). A significantcorrelation between the severity of colitis and bacterial compositionwas only observed for Bifidobacterium (p=0.005,correlation coefficient=-0.531). Conclusions: The colonicmicroflora differed significantly between the diversion andcontrol groups. Bifidobacterium was negatively correlatedwith the severity of diversion colitis.

치료 가능한 사망으로 측정한 우리나라 지역 간 건강수준의 격차

백세종 ( Sei-jong Baek ),김희년 ( Heenyun Kim ),이다호 ( Da-ho Lee ),정형선 ( Hyoung-sun Jeong ) 한국보건행정학회 2021 보건행정학회지 Vol.31 No.1

Background: This study aims to figure out the gaps in health status by estimating amenable mortality rate by region, reflecting the characteristics of Korea, and estimating the years of life lost (YLL) per capita by disease. Methods: People who died from amenable diseases between 2008 and 2018 were extracted from the cause of death statistics provided by Statistics Korea. The age-standardized amenable mortality rates were estimated to compare the health status of 229 regions. YLL per capita was calculated to compute the burden of diseases caused by treatable deaths by region. The YLL per capita by region was calculated to identify the burden of disease caused by amenable deaths. Results: First, while the annual amenable mortality rate in Korea is on a steady decline, but there is still a considerable gap between urban and rural areas when comparing the mortality rates of 229 areas. Second, YLL per capita due to the amenable deaths is approximately 14 person-years during the analysis period (2008-2018). Conclusion: Although the health status of Koreans has continuously improved, there is still a gap in health status region by region in terms of amenable mortality rates. Amenable death accounts for a loss of life equivalent to 14 person-years per year. Since the amenable mortality rate is an indicator that can measure the performance of the health care system, efforts at each local area are required to lower it.

박리-재부착 이후의 재발달 난류경계층 I

백세진,유정열 대한기계학회 1989 대한기계학회논문집 Vol.13 No.4

본 연구에서는 재부착 이후의 재발달 난류경계층에서의 난류구조와 비평형 상태에서 평형상태로의 변화 과정을 실험적으로 고찰하고자 한다. An experimental study has been performed to investigate the process from nonequilibrium state to equilibrium state in redeveloping turbulent boundary layer beyond separation-reattachment using pitot tube and hot-wire anemometer. The model sued in the experiment has the form of a backward facing step which is assembled by a two-dimensional 4:1 half elipse and a plate. Measurements are carried out up to a distance of about 50 step height downstream of the step, where the reattachment observed at about x/h=6.5. The profiles of the shape factor H the Clauser parameter G and the coefficient of friction $C^{f}$ exhibited the characteristics similar to those of the equilibrium turbulent boundary layer from x/h=25, and the profiles of the trubulent quantities did from x/h=35. However, the wake region of the boundary layer does not seem to recover the equilibrium turbulent boundary layer even at x/h=50. By considering the distributions of the intermittency factor it has been noted that the turbulence structure changes gradually from a mixing layer to a turbulent boundary layer along downstream direction after reattachment. This becomes clearer as we analyse the one-dimensional energy spectra and the dissipation energy spectra which are measured and caculated at various downstream positions after the backward facing step.p.

박리-재부착 이후의 재발달 난류경계층 II -난류 모델들에 관한 고찰-

백세진,유정열 대한기계학회 1989 대한기계학회논문집 Vol.13 No.5

본 연구의 목적은 첫째, 재발달 경계층에서의 난류에서지 및 난류전단응력에 대한 전달방정식들의 각 항의 측정자료들을 보다 정확히 제시하고 항들간의 균형을 비교 평가함으로써 비평형 유동으로부터 평형유동으로 회복되는 과정을 검토하고, 둘째, 대표적인 난류 모델들로써 표존 k-.epsilon.모델 및 레이놀즈 응력 모델을 사용한 수치계산을 수행함으로써 이와같은 모델들이 비평형 유동을 서술함에 있어 발생될 수 있는 문제점들을 고찰하는데 있다. A consideration on the trubulence models for describing the redeveloping turbulent boundary layer beyond separation-reattachment in the flow over a backward-facing step is given through experimental and numerical studies. By considering the blance among the measured values of respective terms in the transport equations for the turbulent kinetic energy and the turbulent shear stress, the recovering process of the redeveloping boundary layer from non-equilibrium to equilibrium has been investigated, which takes place slowly over a substantial distance in the downstream direction. In the numerical study, the standard K-.epsilon. model and the Reynolds stress model have been applied to two kinds of flow regions, one for the entire downstream region after the backward-facing step and another for the downstream region after reattachment. Then the results are compared to a meaningful extent, with the experimental values of the turbulent kinetic energy k, the turbulent energy production term P, the dissipation term K-.epsilon. model, a necessity for a new modelling has been brought forward, which can be also applied to the case of the nonequlibrium turbulent flow.

C-130H 수송기 구조 피로수명 산출 기법 연구

백세일(Seil Baek),원상훈(Sanghoon Won) 대한기계학회 2021 대한기계학회 춘추학술대회 Vol.2021 No.5

군용 항공기들은 MIL-STD-1530 Aircraft Structural Integrity Program(ASIP) 요구도에 따라 기체 구조가 설계되고 제작됨으로써 비행안전을 보장하고 감항인증 기준을 충족도록 하고 있다. 또한 항공기 운영단계에서는 운용군이 주기적으로 피로수명을 평가할 수 있도록 모니터링 시스템을 제공토록 하고 있다. C-130 수송기는 설계 시 ASIP 요구도가 미반영되어 피로수명을 산출할 수 있는 시스템이 개발되지 않았다. 대신 운용도평가(OUE, Operating Usage Evaluation)를 통해 산출된 운용격렬도(SF, Severity Factor)를 기준으로 구조 피로수명을 산출한다. 이 방법은 운용도의 변화로 인한 피로수명 증가율 변화를 충분히 반영할 수 없으므로 타 기종의 피로수명 산출 방법에 비해 다소 정확도가 부족하다. 본 연구에서는 C-130H 수송기의 주요구조 부위 피로수명을 보다 정확히 산출할 수 있는 기법과 시스템을 개발하였다. 시스템 개발에 필요한 기본 비행운용 정보(고도, 속도 등) 획득을 위해 1대의 C-130H에 KAM-500 장비를 장착하고 주요구조 부위에 Strain Gauge를 부착하였다. 획득된 데이터를 기반으로 각 비행 조건별 피로손상률 값을 설정하여 실시간 운용도를 반영한 피로수명을 산출할 수 있도록 하였다. Generally the Military aircraft are designed and developed in accordance with the MIL-STD-1530 Aircraft Structural Integrity Program(ASIP) requirements to ensure safety of flight and meet airworthiness criteria. In addition, for the aircraft operation phase, a monitoring system is provided so that the users can periodically evaluate fatigue life. In the case of C-130H cargo aircraft does not incorporate ASIP requirements in its design, so no system has been developed to assess fatigue life. Instead structural fatigue life is calculated based on SF(Severity Factor) extracted from Operating Usage Evaluation(OUE). This method can not take account the fatigue life accumulation rate caused by usage variation, and is less accurate than other aircraft model. In this work, the methodology and system was developed to predict fatigue life for C-130H primary structures. To obtain basic flight operational information(altitude, speed, etc.) for system development, one C-130H was equipped with KAM-500 and attached Strain Gauges on the primary structural area. This system allows to calculate fatigue life reflecting real-time operational usage through the fatigue damage rate for each flight conditions.