주변사용자를 고려한 상황인식 역할기반 접근제어 모델

조민지(Minji Jo),박석(Seog Park) 한국정보과학회 2011 한국정보과학회 학술발표논문집 Vol.38 No.1A

모바일 환경으로 업무 환경이 변화함에 따라 발생할 수 있는 요구사항인 탈 사무실화, 기기의 다양성, 실시간성을 만족하면서 보안성을 유지하기 위해 context aware RBAC 모델이 적용되고 있다. 하지만 기존의 상황인식 역할기반 접근제어 모델은 주변 사용자에 대한 고려가 없고 사용자의 단독적인 정보유출이 가능하다는 단점을 가지고 있다. 이를 해결하기 위해 본 연구에서 제안하고 있는 사용자간의 관계를 고려한 상황인식 역할기반 접근제어 모델에서는 기존의 기법에서 고려하지 않은 주변 사용자의 역할 및 관련된 사용자와의 관계를 고려하여 위치와 시간만으로 제어되지 않는 정보에 대한 유출을 방지한다. 이 모델을 적용할 경우 주변사용자의 권한에 의해 사용자의 권한이 통제되므로 문서에 대한 내부자의 편법적인 사용을 방지하는 것이 가능하고 실시간으로 문서에 대한 권한을 부여할 수 있다. 또한 문서에 대한 권한을 모두 부여할 경우와 동일한 업무 효율성을 가지면서 필요하지 않은 시간에 발생할 수 있는 보안 위협을 방지할 수 있다.

1960-70년대 서비스노동의 특성과 버스안내원들의 저항

조민지(Minji Jo) 역사학연구소 2022 역사연구 Vol.- No.44

1960-70년대 여성 버스안내원들은 서비스 노동이 어떻게 현장에서 개별 노동자들의 여성성을 활용하는 위에서 작동할 수 있었는지를 잘 보여주는 전형적인 사례이다. 서비스노동자들의 상황이 동시대 제조업 노동자들의 상황과 달랐던 점은 노동현장에서 대면해야 하는 소비자들의 존재였다. 대중교통의 경우 한국사회에서 버스를 이용하는 관습이 정착되기까지 현장에서 다양한 형태의 마찰이 발생했고, 여기에서 파생되는 비용은 결국 말단 여성노동자들에게 전가되었다. 이런 상황에서 현장에서 승객들보다 낮은 지위로 있어주는 것은 업무의 핵심이었고, 안내원들은 일상적인 차별에 방어적으로 대응하면서도 끊임없이 공식적·비공식적인 방식으로 저항을 도모했다. 이때 개별 노동자들의 노동환경과 조건에 소비자들의 행위가 깊이 연루되는 서비스노동의 특성은, 사용자 측에 저항하는 노동자들의 전략에도 영향을 미쳤다. 버스안내원들은 사업장 단위로 결의하여 출근을 거부하면 얼마든지 시내 교통을 마비시킬 수 있었고, 이 사실은 고용주와의 관계에서 강력한 협상력으로 작용했다. 쟁의행위가 제한된 1970년대에는 정부가 버스안내원 문제에서 더욱 적극적인 행위자로 등장했고, 온정주의적 노사관계를 권장하기 위한 소재로 버스안내원들을 활용했다. 버스 승객들은 정부와의 관계에서 시민이기도 했기 때문에, 이들의 시선에 노출된 안내원들은 정부 홍보정책의 중요한 소재로 쓰일 수 있었다. 그러나 안내원들은 단순히 정치적 자원으로 이용되는 것에 그치지 않고, 그들 스스로를 둘러싼 긴장관계를 적극 활용하여 노동조건을 개선하려 한 주체들이기도 했다. This study focuses on how the characteristics of service labor based on the relationship with consumers constructed the way of workers’ resistance while the norms of this field began to settle during the 1960s and 70s. Female bus attendants at that time were a typical example indicating how the service sector could function by exploiting the femininity of individual workers in the field. What made the situation of service workers different from those in the manufacturing field was the existence of consumers in the workplace. In the case of public transportation, for example, the unexpected costs and conflicts from unsettled conventions shifted to those vulnerable female workers on board. Under these circumstances, their lower status in the workplace was the core of the job, so that the attendants had to be defensive against daily discrimination yet constantly seeking resistance in both formal and informal ways. The characteristics of service labor, in which consumers are deeply implicated in their working ‘conditions, also influenced the attendants strategy for their strikes. Any group of bus attendants from a singular business was able to paralyze the entire city traffic by refusing daily work, which acted as a strong leverage in negotiations with their employers. When the industrial actions were strongly restricted during the 1970s, the government started to act as a major player in this picture, using female bus attendants as an available resource to display their ideal paternalistic labor-management relations. Since their passengers were also citizens in relation to the government, the bus attendants could become even more useful item for the governmental public relations in the sense of public awareness. The female bus attendants, however, did not just remain political objects, but actively took advantage of the tensions surrounding themselves to improve working conditions.

5·16 쿠데타와 ‘서비스’의 젠더정치

조민지(Minji Jo) 역사비평사 2021 역사비평 Vol.- No.135

This study focuses on how the military coup used female service workers to support their political rhetoric during the power transition. Since their authoritarian and corrupt predecessors had exhausted Koreans, the coup group insisted on courteous and self-sacrificial attitudes as virtues for workers in public service. As the easiest way to visualize those virtues, Park Chung-hee’s group changed workers in face-to-face service sectors to females, saying that women could give better “service”. Cases of bus attendants or hospitality workers show how vulnerable female workers had to cover cost and risk in the field, under the name of “service”. Even when the value of “feminine” service drew significant attention, however, positions or roles given to women were basically still limited and homogeneous. In many cases, women in service sectors were hired based only on the value of their biological gender, where career or specialty did not matter. Just like the subsequent industrialization plans, the politics of the military coup also managed to work by exploiting workers’ femininity in the field.

부유식 해상풍력시스템의 제어기 설계

조민지(Minji Jo),박성수(Sungsu Park) 한국신재생에너지학회 2015 신재생에너지 Vol.11 No.2

We present a collective blade pitch control algorithm for floating offshore wind turbines. Control objectives are to regulate the rated power of a generator and to maintain the stability of platforms in region 3. To achieve these, the optimal control method with integral action is basically used with a Kalman filter. The Kalman filter is designed to estimate the wind speed as well as wind turbine and platform states. The performances of the designed controllers are tested and verified by comparing the standard deviations of the assigned parameters of our controllers with those of the standard controllers, according to the IEC standard conditions.

Patterns of recurrence after radiation therapy for high-risk neuroblastoma

Jo, Ji Hwan,Ahn, Seung Do,Koh, Minji,Kim, Jong Hoon,Lee, Sang-wook,Song, Si Yeol,Yoon, Sang Min,Kim, Young Seok,Kim, Su Ssan,Park, Jin-hong,Jung, Jinhong,Choi, Eun Kyung The Korean Society for Radiation Oncology 2019 Radiation Oncology Journal Vol.37 No.3

Purpose: To investigate the patterns of recurrence in patients with neuroblastoma treated with radiation therapy to the primary tumor site. Materials and Methods: We retrospectively analyzed patients with high-risk neuroblastoma managed with definitive treatment with radiation therapy to the primary tumor site between January 2003 and June 2017. These patients underwent three-dimensional conformal radiation therapy or intensity-modulated radiation therapy. A total of 14-36 Gy was delivered to the planning target volume, which included the primary tumor bed and the selected metastatic site. The disease stage was determined according to the International Neuroblastoma Staging System (INSS). We evaluated the recurrence pattern (i.e., local or systemic), progression-free survival, and overall survival. Results: A total of 40 patients with high-risk neuroblastoma were included in this study. The median patient age was 4 years (range, 1 to 11 years). Thirty patients (75%) had INSS stage 4 neuroblastoma. At the median follow-up of 58 months, there were 6 cases of local recurrence and 10 cases of systemic recurrence. Among the 6 local failure cases, 4 relapsed adjacent to the radiation field. The other 2 relapsed in the radiation field (i.e., para-aortic and retroperitoneal areas). The main sites of distant metastasis were the bone, lymph nodes, and bone marrow. The 5-year progression-free survival was 70.9% and the 5-year overall survival was 74.3%. Conclusion: Radiation therapy directed at the primary tumor site provides good local control. It seems to be adequate for disease control in patients with high-risk neuroblastoma after chemotherapy and surgical resection.

The value of prophylactic cranial irradiation in limited-stage small cell lung cancer: should it always be recommended?

Minji Koh,Si Yeol Song,Ji Hwan Jo,Geumju Park,Jae Won Park,Su Ssan Kim,Eun Kyung Choi 대한방사선종양학회 2019 Radiation Oncology Journal Vol.37 No.3

Purpose: Prophylactic cranial irradiation (PCI) is a standard treatment for limited-stage small cell lung cancer (LS-SCLC) showing a response to initial treatment, but many patients do not receive PCI due to comorbidities or refusal. This study aims to define the patient group for whom PCI can be omitted with minimal risk. Materials and Methods: Patients with LS-SCLC who underwent radiotherapy with curative aim at our institution between January 2004 and December 2015 were retrospectively reviewed. Patients who did not receive PCI were evaluated for brain metastasis-free survival (BMFS), progression-free survival (PFS), overall survival (OS), and prognostic factors for survival, and treatment outcomes were compared with a patient cohort who received PCI. Results: A total of 350 patients achieved a response following thoracic radiotherapy, and 190 of these patients did not receive PCI. Stage I–II and a complete response (CR) to initial therapy were good prognostic factors for BMFS and OS on univariate analysis. Patients with both stage I–II and a CR who declined PCI showed comparable 2-year BMFS to those who received PCI (92% vs. 89%). In patients who achieved CR, PCI did not significantly improve OS or PFS. Conclusion: There should be less concern about omitting PCI in patients with comorbidities if they have stage I–II or a CR, with brain metastasis control being comparable to those patients who receive PCI.

A study on the relationship between academic achievement, self-efficacy and anxiety of nursing students who have experienced online remote lecture education

Gyusang Jo,Ahyeong Oh,Hwon Kim,Jibin Seok,Subin Oh,Hayoung Yun,Malgeum Lee,Minji Lee,Youngshin Lee 한국성인간호학회 2021 성인간호학회 학술대회 Vol.2021 No.8

Aim(s): This study was conducted in order to understand the difference in academic achievement according to the lecture time of online classes and to understand how self-efficacy and anxiety are correlated with academic achievement. Currently, due to COVID-19, the change in the learning environment of students became inevitable. Through previous studies, it was found that there is a correlation between academic achievement, self-efficacy, and anxiety. Correlation studies are needed as there are positive or negative conflicting results. Method(s): Subjects were 1st, 2nd, and 3rd year nursing students attending 4-year K University in Chungbuk, who had experienced online classes. The collected data were used by the SPSS 18.0 program to perform t-test, ANOVA, and correlation analysis. Result(s): First, men have higher academic self-efficacy than women, and women have higher levels of anxiety than men. Second, academic self-efficacy was high in the order of second grade, first grade, and third grade. Third, the lower the grade, the higher the anxiety, and the higher the grade, the higher the academic self-efficacy. Fourth, the self-efficacy of solving problems was high in the order of credit 2.99 or less > 4.0 or higher > 3.5 – 3.99 > 3.0 – 3.44. Fifth, the higher the grade, the shorter the online lecture time, and the shorter the online lecture time, the higher the academic self-efficacy. Conclusion(s): It showed a positive correlation between Academic performance and self-efficacy, a negative correlation between academic performance and anxiety. Academic performance and problem-solving, self-efficacy did not show correlation. Finally, the more time spent on online remote lectures, the lower the academic achievement and academic self-efficacy. However, it should be considered that achievements through online lectures cannot be evaluated in the same way as those through existing methods of teaching.

Tuning non-volatile memory characteristics via molecular doping of polymer semiconductors based on ambipolar organic field-effect transistors

Kang, Minji,Khim, Dongyoon,Kim, Jihong,Lee, Hyeon Jun,Jo, Ji Young,Baeg, Kang-Jun,Kim, Dong-Yu Elsevier 2018 ORGANIC ELECTRONICS Vol.58 No.-

<P><B>Abstract</B></P> <P>Expandability of organic electronics has stimulated ongoing research for the development of a variety of flexible and/or large-area optoelectronic applications. Among these electronic devices, organic non-volatile memories are emerging as suitable components for solid-state data storage because of their low-cost fabrication, large storage capacity, light weight, and conformable mechanical properties. To fully integrate organic memories with wearable and flexible/stretchable electronic systems, it is important to develop a device in which the properties such as threshold voltage and operating regime are controllable. This leads to improvement in the adaptability of the device to peripheral circuitry and encourages the development of multi-functional organic electronic components. Here, we investigate the tunable electrical properties of charge-trap (electret) memory devices based on organic field-effect transistors, obtained by the doping of an ambipolar polymer semiconductor. The electret memory devices using the doped semiconductor showed a remarkable enhancement in the charge-storage capacity, an excellent charge retention time of more than 10<SUP>7</SUP> s, and four-fold increase in charge carrier mobility. The improved memory characteristics associated with the controllable molecular doping could pave the way for the development of next-generation memory devices that are compatible with flexible and printed electronic technology.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Electret memory devices using the p-doped PDVT-10 polymer semiconductor were fabricated. </LI> <LI> We demonstrated that the doping of organic semiconductor in the memories can modulate the efficiency of charge trapping. </LI> <LI> The devices showed a retention time of more than 10<SUP>7</SUP> s and four-fold increase in charge carrier mobility. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

비지도 학습 기반 상호보완적 거리 및 움직임 추정 시스템

조민지(Minji Cho),조영수(Youngsu Jo),공경보(Kyeongbo Kong),강석주(Sukju Kang) 대한전자공학회 2021 대한전자공학회 학술대회 Vol.2021 No.11

Design of a microchannel-based reactor module for thermally coupled reactions: Oxidative coupling and steam reforming of methane

Son, Minji,Park, Seon-Ju,Lee, Yun-Jo,Park, Myung-June Elsevier Science B.V., Amsterdam. 2018 INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER - Vol.127 No.3