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석병석(Suk, Byong-suk),민승용(Min, Seung-yong),권재욱(Kwon, Jae-wook),김창균(Kim, Chang-kyoon),문상만(Moon, Sang-man),최수진(Choi, Su-jin),구철회(Koo, Cheol-hea),김인규(Kim, In-kyu),류동영(Ryu, Dong-young) 한국항공우주연구원 2015 항공우주산업기술동향 Vol.13 No.2
시험용 달 궤도선의 발사 요구조건 사전 분석 단계로 최근 외국에서 발사한 달 탐사선의 발사 요구조건을 분석하였다. 일반적으로 달 탐사선의 발사 요구조건은 달 임무 궤도를 결정하는 중요한 요소이며, 또한 지구, 달, 태양의 상대적인 운동으로 인해 임무궤도 요구조건을 만족하는 발사 가능 시간이 주기적으로 반복되는 경향이 있다. 분석 결과 설정된 발사 요구조건들로부터 달 궤도선의 주 임무가 달의 남/북극 지역의 광학 관측 임을 간접적으로 알 수 있었다. 향후 우리나라 달 궤도선 발사 요구 조건 설정에 본 논문이 도움이 되길 기대한다. In the preliminary study on launch window requirement for Korea Path-finder Lunar Orbiter(KPLO), the recent foreign lunar orbiter’s lauch window requirement was analyzed. Normally, the launch requirements depends on the mission orbit. Based on the relationship between Moon, Earth, and Sun, the launch time will be available periodically to meet requirements. In this paper, it is understood that the launch window requirements come from payload mission requirements to take picture each poles of Moon. This paper might be a practical example to derive KPLO launch requirements in the future.
Gate Length Optimization for Minimum Forward Voltage Drop of IGBTs
Moon Jin-Woo,Park Dong-Wook,Choi Yearn-Ik,Chung Sang-Koo The Korean Institute of Electrical Engineers 2005 KIEE International Transactions on Electrophysics Vol.5C No.6
The forward voltage drop of IGBT is studied numerically and analytically as a function of gate length. An analytical expression is presented for the first time for the surface potential variation along the channel layer under the gate of IGBT. The surface potential drop and the carrier density near the surface allow calculation of the forward voltage drop of IGBT analytically as a function of the gate length. The voltage-drop in the drift region near the gate decreases exponentially, whereas that on the surface increases linearly with increasing the gate length, the sum of which exhibits an optimum gate length, resulting in a minimum forward voltage drop. Based on the surface potential drop, a remodelling of the forward voltage drop of IGBT is also proposed.
Deep Drawing With Internal Air-Pressing to Increase The Limit Drawing Ratio of Aluminum Sheet
Moon, Young-Hoon,Kang, Yong-Kee,Park, Jin-Wook,Gong, Sung-Rak The Korean Society of Mechanical Engineers 2001 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.15 No.4
The effects of internal air-pressing on deep drawability are investigated in this study to increase the deep drawability of aluminum sheet. The conventional deep drawing process is limited to a certain limit drawing ratio(LDR) beyond which failure will occur. The intention of this work is to examine the possibilities of relaxing the above limitation through the deep drawing with internal air-pressing, aiming towards a process with an increased drawing ratio. The idea which may lead to this goal is the use of special punch that can exert high pressure on the internal surface of deforming sheet during the deep drawing process. Over the ranges of conditions investigated for Al-1050, the local strain concentration at punch nose radius area was decreased by internal air-pressing of punch, and the deep drawing with internal air-pressing was proved to be very effective process for obtaining higher LDR.
The use of ingenol mebutate gel as adjuvant therapy for large or multiple Bowen disease
( Sang Jin Cheon ),( Hyun Ju Jin ),( Hyang Suk You ),( Woo Haing Shim ),( Jeong Min Kim ),( Gun Wook Kim ),( Hyun Chang Ko ),( Byung Soo Kim ),( Moon Bum Kim ),( Hoon Soo Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Bowen disease (BD) is squamous cell carcinoma in situ, which may progress to invasive carcinoma if not adequately managed. In single and small BD, many therapeutic options are available including excision, curettage, cryotherapy, and topical agents such as 5-fluorouracil and imiquimod. But in the case with large or multiple lesions, therapeutic choice is restrictive. Herein, we experienced two cases of large or multiple BD successfully managed with ingenol mebutate gel. A 81-year-old woman was diagnosed as BD for large lesion on the right calf measuring 7 x 10 cm. We applied ingenol mebutate gel 0.05% on the affected area once daily for 2 consecutive days. 1 month after treatment, crust fell out and only focal small lesion was remained. After additional cryotherapy was done twice and clinically resolved large BD during follow-up 6 months.. A 54-years-old woman was diagnosed as BD for multiple hyperkeratotic plaques on the both palms. We applied ingenol mebutate gel 0.05% once daily for 2 consecutive days. After 3 months, only a few lesions were remained. Following three times additional cryotherapy, the lesions were improved enough to be controlled cryotherapy. Through our experience, we suggest ingenol mebutate gel could be effective adjuvant therapy option for large or multiple BD.
Moon Sung Kang,Su-Jin Song,Ji Hyeon Cha,Yeonoh Cho,Hyun Uk Lee,Suong-Hyu Hyon,Jong Hun Lee,Dong Wook Han 한국공업화학회 2020 Journal of Industrial and Engineering Chemistry Vol.92 No.-
Recently, the composites of varying biomaterials and two-dimensional (2D) nanomaterials have beenincreasingly developed in thefield of tissue engineering and regeneration owing to their excellentphysicochemical and mechanical properties. In particular, the combination of biocompatible polymersand 2D nanomaterials can endow the nanocomposite with novel biofunctional properties whilemaintaining the inherent character of every single material. These nanocomposites are known to havethe potential for improvement of cellular behaviors such as cell adhesion, proliferation, anddifferentiation. In this study, poly(l-lactide-co-e-caprolactone) (PLCL) and laminin (Lam) nanofibersfunctionalized with black phosphorus (BP) were successfully fabricated to increase the neuritogenesis ofHT22 hippocampal neuronal cells using an electrospinning process. The ternary nanofiber matrices ofPLCL/Lam/BP were found to be suitable for supporting the attachment and proliferation of hippocampalneurons. Furthermore, these PLCL/Lam/BP nanofiber matrices could not only promote neurite outgrowthand alignment but also increase the neuritogenesis of hippocampal neurons by providing optimalmicroenvironments for neuronal differentiation. The underlying mechanism of this phenomenon wasconfirmed by determining the expression levels of genes related to neurogenesis. In conclusion, theseresults suggest that BP-functionalized composite nanofibers could be a promising candidate as a scaffoldfor neural tissue engineering and regeneration.
Mycoplasma pneumoniae -induced rash and mucositis
( Sung Min Park ),( Hyunju Jin ),( Hyang Suk You ),( Woo Haing Shim ),( Jeong Min Kim ),( Gun Wook Kim ),( Hoon Soo Kim ),( Byung Soo Kim ),( Moon Bum Kim ),( Hyun Chang Ko ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Mycoplasma pneumoniae (M. pneumoniae)is one of the most common causes of respiratory tract infections in pediatric and adult populations worldwide. In dermatologic disorder, M. pneumoniae infection is known to be associated with erythema multiforme (EM) and Stevens-Johnson syndrome (SJS) in children and young adults. Recently, several cases with M. pneumoniae-associated mucositis with lacks typical target lesions have been reported. The term of Mycoplasma-induced rash and mucositis (MIRM) was suggested to revise from M. pneumoniae-associated mucocutaneous disease including EM and SJS because of distinct morphology, mild disease course, and potentially important clinical implications regarding treatment.Herein, we report a patient with MIRM. A 5-year-old boywas referred to the department of dermatology forerythematous maculopapuleson the face, trunk, and extremities. Physical examination revealed swollen eyelids with conjunctival injection, swollen lips, and erythematous erosive patch on the penile tip and perianal area.Histopathologic finding showed subepidermal blister with epidermal necrosis, and perivascular lymphohistiocytic infiltrations.Chest radiograph demonstrated localized infiltration in the right upper lobe, and M. pneumoniaeIgM antibodies was positive. Hewas treated with antibiotics, intravenous immunoglobulins, and showed rapid recovery within 2 weeks without any sequelae. Keyword: Mycoplasma pneumoniae, Mucositis, Rash, Stevens-Johnsons syndrome, Erythema multiforme
The Effect of the Exposed Aggregate Concrete Pavement on the Reducing Traffic Noise Emission
Moon, Han-Young,Ha, Sang-Wook Korea Concrete Institute 2003 콘크리트학회논문집 Vol.15 No.2
Portland cement concrete (PCC) pavements are more durable and have superior surface friction compared to most dense-graded asphalt. However, data collected to date generally show PCC pavements to create more noise than asphaltic surfaces. Recent research has shown that some of the new concrete pavement textures are worthy of further examination. One of these, exposed aggregate surfaces, appear to provide better noise quality characteristics as well as good frictional characteristics and durability. In this paper, we considered the relationship between noise level and various textures of exposed aggregate concrete (EAC) pavement by tire impact noise measurement. As the results of that, it was suggested that optimum surface texture and manufacturing condition of EAC in order to reduce tire and pavement interaction noise. Conclusively, we would like to recommend optimum condition of EAC pavement at the respects of materials and treatment. Furthermore, Frequency spectrum as well as A-weighted noise level was also evaluated to analyze properties of noise between PCC and EAC.
Inexplicable but real phenomenon: rapidly regressed
( Sung Min Park ),( Hyunju Jin ),( Hyang Suk You ),( Woo Haing Shim ),( Jeong Min Kim ),( Hoon Soo Kim ),( Hyun Chang Ko ),( Byung Soo Kim ),( Moon Bum Kim ),( Gun Wook Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.1
Kaposi’s sarcoma (KS) is a type of spindle cell malignancy that arises from the vascular endothelium, usually presenting as violaceous papules and plaques. KS development is invariably linked with human herpesvirus (HHV)-8 infection. Almost spontaneous regressions of KS have been previously described in the iatrogenic type. Herein, we present a classic KS in immunocompetent patient showing rapid regression after biopsy. A 78-year-old male presented with relatively well-defined erythematous patches on forehead, Rt. upper eyelid and chin, and violaceous papule on nose. His medical and family histories were noncontributory. The patient denied history of recent overseas travel, homosexual or unnatural sexual practices, and serum anti-HIV antibody was negative. A histopathologic examination from the nose revealed typical findings of KS and tumor cells showed positive staining for CD31, CD34, and factor VIII-related antigen. Polymerase chain reaction in a biopsy specimen was positive for HHV-8. Without specific treatment, the lesion rapidly regressed within 2 weeks. It is generally accepted that immune status plays an important role for KS. As viral wart disappear after biopsy occasionally, it is possible that the biopsy may have then exposed antigens and induced an immunologic reaction, which led to the rapid regression of KS.