폴리머 공법 적용 불균질 저류층에서의 유효 압축률이 오일생산에 미치는 영향 분석

백수현,정우동,성원모,서준우,Baek, Soohyun,Jung, Woodong,Sung, Wonmo,Seo, Junwoo 대한자원환경지질학회 2014 자원환경지질 Vol.47 No.3

불균질한 자연균열 저류층에서 암체의 압축률은 매우 작은 값을 가지는 반면에 균열의 압축률은 상대적으로 큰 값을 갖는다. 균열의 압축률을 포함한 유효 압축률을 고려하지 않을 경우에는 균열의 간극 변화로 인한 공극 부피의 변화를 반영할 수 없기 때문에 정확한 오일 회수를 예측할 수 없다. 본 연구에서는 기존의 연구들에서 암체의 압축률만을 고려하여 오일 회수를 분석했던 것과 달리, 암체와 균열의 압축률을 모두 고려한 유효 압축률을 적용해서 오일 회수량을 분석하였다. 폴리머 공법에서 균열의 압축률이 폴리머의 주입에 미치는 영향을 이해하기 위해, 폴리머의 분자량, 농도, 주입속도에 따른 오일 회수량을 분석하였다. 유효 압축률을 고려할 경우 폴리머 분자량, 농도, 주입속도가 높아질수록 유효 압축률을 고려하지 않은 경우가 고려한 경우보다 누적 오일 생산량이 높게 나타났다. 또한 공저 압력의 경우에도 유효 압축률을 고려하지 않은 경우가 고려한 경우보다 빠르게 급감하여 오일 생산량에 영향을 주는 것을 확인할 수 있다. The compressibility of fracture in naturally fractured reservoir is larger than the compressibility of matrix in rock, although the compressibility of a typical rock is very small. The effective compressibility including the fracture compressibility should be considered to predict oil recovery correctly. It is hard to quantify changes of fracture aperture and pore volume in reservoir without the effective compressibility. In this study, oil recovery is analyzed by commercial simulator concerning the fracture compressibility based on fracture properties. We found that the effective compressibility affects oil recovery with change of polymer flooding factors such as polymer molar weight, concentration and injection rate. The estimated cumulative oil production is smaller with the effective compressibility than without it. Also, bottomhole pressure decreases rapidly without considering effective fracture compressibility.

조직 구성원의 네트워크 특성이 직무스트레스에 미치는 영향

백수현(Soohyun Baek),오홍석(Hongseok Oh),신인용(Inyong Shin) 한국인사조직학회 2012 인사조직연구 Vol.20 No.3

직무스트레스(job stress)에 대한 인간관계의 영향에 대한 지금까지의 연구는 양자(dyadic) 관계를 중심으로 진행되어 조직 내에서의 전반적인 인간관계의 양상에 따른 직무스트레스의 수준을 포괄적으로 살펴보지 못했다. 이에 본 연구는 조직의 전체 네트워크(whole network)에서 개인이 점유하는 위치에 따라 얻게 되는 혜택과 제약, 그리고 그로 인한 직무스트레스의 정도를 종합적으로 파악하고자 하였다. 구체적으로, 직무요구-자원 모형(job demand-resource model)을 토대로 구조적 공백(structural hole)이라는 개인의 네트워크 특성이 직무자원과 직무요구를 매개로 직무스트레스에 어떠한 영향을 미치는지를 살펴보았다. 특히 조직 구성원의 구조적 공백 점유 정도가 직무자원과 직무요구 모두에 영향을 미칠 가능성을 염두에 두고 경쟁가설을 설정하였다. 두 조직을 대상으로 70명의 구성원에 대한 전체 네트워크를 측정하여 분석한 결과, 개인이 구조적 공백을 점유할수록 사회적 지원과 직무통제를 포함하는 직무자원이 증가하며 직무자원을 매개로 직무스트레스를 덜 경험하게 되는 것으로 나타났다. 그러나 역할갈등, 역할과 부하, 역할모호성과 같은 직무요구에 대한 구조적 공백의 효과 및 구조적 공백 점유와 직무스트레스의 관계에 대한 직무요구의 매개효과는 나타나지 않았다. 이러한 연구결과는 구조적 공백의 점유가 더 많은 직무자원의 확보를 용이하게 함으로써 궁극적으로 직무스트레스를 감소시킨다는 점을 제시한다. Academics and business managers have increased their attention to job stress in organizations because evidence mounts that severe job stress leads to the negative effects on individuals and organizations. Organizational researchers have further recognized that the antecedents and processes of job stress are important for understanding this phenomena and are therefore worth examining. Since interaction perspective was suggested, job stress researchers have focused on the complex relationships between individuals and their work contexts. Recently, one focus of job stress research has been on interpersonal relationships because the relationships of members in an organization directly influence their job stress or moderate the causes of job stress. However, most previous stress research on the interpersonal relationships have tended to focus on dyadic relationships between individuals such as an individual’s tie with his or her leader or member. If we define the interpersonal relationship so narrowly as the interaction of an individual with just one other person, it would be difficult to understand the various effects of the whole social structure derived from the relationships among actors on that focal person's stress in teams or organizations. Thus, to have a better understanding of the relationships between structural characteristics of social relationships and job stress in organizations, we use social network perspective focusing on the lasting patterns of relations among a set of actors and dyadic relations among them. Particularly, in this study, we focus on the concept of structural holes in social network theory. When an individual who is connected to alters who are not themselves connected to each other, he or she acts as a bridge between other actors in the network, and that means a structural hole exists. An individual who occupies a structural hole in the network is more likely to acquire non-redundant and diverse information through exposure to diverse contacts and tend to exercise control by maintaining separation between alters. In this study, first, drawing on job demands-resources model in job stress research, we examine how individuals' structural hole positions in a network influence their job resources or demands, based on the assumption that when someone occupies structural hole position, he or she becomes a broker that links unconnected persons in the social network structure. Second, we investigate whether structural hole network positions eventually influence job stress through mediating job resources or demands. Through setting competing hypotheses, we explore the impacts of structural holes on job demands or resources and ultimately job stress. We expect that individuals spanning structural holes in a network can benefit from acquiring non-redundant information and controlling the flow of information and thus hypothesize that individuals occupying structural holes in an organization may have advantages such as social support from diverse members and job control via structural autonomy. These benefits may give individuals in structural hole network positions abundant job resources. Previous research has reported that having more job resources reduces the extent of job stress. Therefore our hypotheses are as follows. H1a: Spanning structural holes will be positively related with job resources. H1b: Job resources will mediate the negative relationship between spanning structural holes and job stress. On the other hand, if individuals bridging structural holes have ties with unconnected persons or groups, they tend to receive various and diverse expectations and preferences from these actors who are not themselves connected to each other. These expectation and preference are more likely to be inconsistent or even in conflict. Thus, structural holes can bring out such role stressors as role conflict, role overload, and role ambiguity.

닭의장풀의 알카로이드 성분에 관한 연구(Ⅰ)

백수현,서원준,배기환,진갑덕 충남대학교 약학대학 의약품개발연구소 1990 藥學論文集 Vol.6 No.-

The alkaloidal constituents of Commelina communis (Commelinaceae) were investigated. From the ether soluble alkaloidal fraction, three β-carboline type alkaloids were isolated by chromatographic purification process. Their chemical structures were identified as 1-carbomethoxy-β-carboline, norharman and harman from the physicochemical data, which were newly isolated from this plant.

닭의장풀의 Iridoid, Triterpenoid 및 Steroid 성분에 관한 연구(Ⅱ)

백수현,서원준,배기환,진갑덕 충남대학교 약학대학 의약품개발연구소 1990 藥學論文集 Vol.6 No.-

Three non-alkaloidal constituents, (-)-loliolide as an iridoid, friedelin as a triterpenoid, and β-sitosterol as a steroid, were isolated by fractional extraction and silica gel column chromatography from the herb of Commelina communis L. (Commelinaceae). The structures of the native components were elucidated on the basis of physical and spectral (UV, IR, PMR, CMR, and mass spectra) data.

Anticariogenic β-Carboline Alkaloids from Commelina communis

Bae, Kihwan,Seo, Wonjun,Kwon, Taeho,Baek, Soohyun,Lee, Shinwoong,Jin, Kapduck 영남대학교 약품개발연구소 1993 영남대학교 약품개발연구소 연구업적집 Vol.3 No.-

The methanolic extract of Commelina communis (aerial part) showed antibacterial activity against a cariogenic bacterium, Streptococcus mutans OMZ 176. The active principles were identified to be β-carboline alkaloids. l-carbomethoxy-β-carboline, norharman and harman, which were bactericidal in the minimal inhibitory concentration (MIC) of 100 μg/ml against the strain.