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얇은 렌즈 근사를 이용한 Telephoto Lens계의 수차해석
문준석,이종웅,박성찬 한국광학회 2002 한국광학회지 Vol.13 No.4
We derived analytic formulae for the correction of spherical aberration, coma, and axial color of a two-components lens system consisted of a cemented doublet and a singlet by using the thin lens approximation. The correction formulae were applied to design a telephoto lens system. We examined two kinds of glass combinations in the design, one was crown-flint-crown combination and the other was flint-crown-flint combination. We found two kinds of achromatic aplanat solutions in the crown-flint-crown combination. For the case of flint-crown-flint combination, there were also two kinds of solutions, but their configurations are not useful in practice. 2매 접합렌즈와 단렌즈로 구성된 2군 렌즈계의 구면수차, 코마, 종색수차 보정을 위한 3차수차 전개식을 얇은렌즈 근사를 이용하여 해석적으로 유도하였다. 유도된 3차수차 전개식은 telephoto렌즈계의 설계에 적용되었다. 초기설계에서 광학유리 조합은crown-flint-crown조합과 flint-crown-flint 조합에 관하여 조사하였다. Crown-flint-crown조합의 경우 2가지 형태의 achromatic aplanat 존재하였다. Flint-crown-flint조합의 경우에서도 2종류의 해가 존재하였으나, 해의 형태가 유용하지 못하였다.
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문준석,신헌태,Moon, JoonSeok,Shin, HeonTae 대한예방한의학회 2016 대한예방한의학회지 Vol.20 No.1
Objectives : Self-esteem is a necessary inner factor for the korean medicine undergraduate, who will perform a various treatment relationship as a future health care provider. Writing is closely related with improving self-esteem by providing insight towards oneself. Methods : The level of self-esteem and current state of writing among 251 undergraduates studying korean medicine in Dongshin University were looked into through a structural survey. Results : Self-esteem score was 3.12 on a scale of 4 which was relatively high, but they showed defensive self-esteem tendency. Meanwhile writing variables appeared to be more influential to the self-esteem of undergraduates than personal characteristics. Also among writing variables, emotional writing and writing 2 to 3 times or more a month was related to high self-esteem which defensive self-esteem tendency is low. Majority of the undergraduates, however, turned out to be writing essay and writing 2 to 3 times a month. Conclusions : The following result suggests the need of writing classes as well as writing involved in emotion for self-esteem and improve medical communication in the curriculum of korean medical college.
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추력 히스테리시스를 동반하는 하이브리드 로켓의 PI 추력제어
문준석,이창진 한국항공우주학회 2024 韓國航空宇宙學會誌 Vol.52 No.2
하이브리드 로켓에서 발생하는 추력 히스테리시스를 완화하기 위한 PI 추력제어를 시도했다. PI 제어기 설계를 위해 근 궤적 방법을 이용하여 적절한 게인 값의 범위를 설정하고 자체 개발한 하이브리드 로켓 시뮬레이션 프로그램을 사용하여 응답의 오버 슛의 발생, 상승시간과 초기 응답의 지연 등을 확인하며 게인 값을 결정했다. 또한, 추력 실험을 수행하여 PI 제어기가 추력 히스테리시스의 완화와 추력의 정밀 제어에 미치는 영향을 최종적으로 확인했다. 응답의 오버 슛 발생을 감소시키고 상승시간 지연을 줄이기 위한 실험의 결과, 다른 경우에 비해 응답 오차가 50% 정도 감소했다. 그러나 PI 제어기로 과도 특성을 모두 고려할 수 없으므로 보다 정밀한 추력 제어를 달성하려면 추력 히스테리시스에 대한 비선형 모델과 선형 제어를 결합하는 피드 포워드(feed forward) 제어 방법이 필요하다[12]. PI thrust control was attempted to alleviate thrust hysteresis observed in hybrid rocket combustion. A proper range of gain values was firstly selected using the root locus method for PI controller design, and final values were determined by checking the occurrence of overshoot, rise time, and delay in the response curve using an in-house hybrid rocket simulation program. In addition, thrust tests were conducted to confirm the effect of PI controllers on the mitigation of thrust hysteresis and precise thrust control. Combustion tests confirmed that the occurrence of overshot of responses and rise time delays were significantly reduced by 50% in response error compared to other cases. However, PI controllers cannot be effective in alleviating all these transient characteristics, a feed forward control method that combines the application of a nonlinear model to thrust hysteresis and linear control is needed to improve the precision of thrust control.
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문준석,신헌태,Moon, Joon Seok,Shin, Heon Tae 대한예방한의학회 2017 대한예방한의학회지 Vol.21 No.1
Purpose : Recently, cancer has become a chronic disease that requires supervision because of early diagnosis and the development of therapeutic technology. As a result, cancer patients are interested in improving the quality of their lives besides the treatment of cancer itself. Therefore, it is necessary to conduct a qualitative research to understand the vivid experiences of cancer patients and structure their treatment experience. Among qualitative researches, grounded theory is developed based on the data collected in the field. The grounded theory research method is easy to analyze for the process and structure of the treatment experience. Therefore, the purpose of this study is to provide basic data on the integrated medical experience of cancer patients Methods : Participants were conveniently selected, and the criteria for selection were for those who had more than 1 month of hospitalization so that they could dictate their situation and experience in a meaningful manner. Data was collected through in-depth interviews and continued until the data were saturated through theoretical sensitivity and continuous comparison methods. The collected data were analyzed through the process of open-coding, axial coding, and selection coding, which are the research methods of grounded theory. Results : Cancer patients differ in their path, purpose, and attitudes depending on their respective situations and the internal and external resources of individuals. There is also a difference in the perception of their situation among the cancer patients and their families. Cancer patients were shown to recognize and cope with problems in the integrated medical treatment process, and have been classified into 6 different types after the results. Cancer patients showed positive changes in terms of physical, emotional, and lifestyle after their integrated medical treatment. Cancer patients perceived the integrated medical treatment process as a horizontal relationship structure and with diversity. Conclusions : The experience of integrated medical treatment of cancer patients is a process of rehabilitation that heals the body and restores life within the interaction of support system, contextual situation, and internal resources of the individual. Despite this, there is a need not only for the efforts of integrated medical service providers but also institutional support in the future with regards to the current weaknesses and points for improvement. In addition, there is a need for an objective criterion to measure the outcome of integrated medicine for the standardization of integrated medical services.
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Clinostomum complanatum에 의한 후두 감염 1예
문준석,박하나로 대한이비인후과학회 부산,울산,경남 지부회 2020 임상이비인후과 Vol.31 No.2
A 22-year-old Korean woman visited our outpatient department with complaints of discomfort and pain on the left part of her throat, occurring 3 days after eating raw fish with chopped fish bone. Laryngeal endoscopy revealed a slow-moving worm, about 5 mm in length, which was found attached to the surface of the left aryepiglottic fold. The fluke was removed by forceps, under local anesthesia with 8% lidocaine spray. The worm was identified to be Clinostomum complanatum (C. complanatum). C. complanatum infection in human is rare and known to occur after eating raw fish, a secondary intermediate host. In humans, metacercariae is known to enter the stomach and then migrate to the throat through the esophagus, causing laryngitis. The only treatment method for this parasite infection is a mechanical removal.
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