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박상헌,심학보,이수구,서성조 서울산업대학교 산업대학원 1992 大學院論文集 Vol.1 No.1
본 연구는 혼합 미생물을 이용한 페놀 함유폐수의 생물학적 처리에 관한 연구로서, 높은 페놀 농도에서의 이를 분해시킬 수 있는 균주를 개발하고 페널 함유폐수의 효과적인 처리를 위한 실험연구이다. 각종 공장폐수, 슬러지, 토양 등 40여종의 시료로부터 페놀 분해균을 선별하였으며, 페놀농도를 단계적으로 높여 미생물을 적응시킨 결과, 페놀농도 1,000ppm의 높은 농도에서도 잘 증식하며 페놀을 효과적으로 분해시킬 수 있었다. 혼합 미생물을 분리 동정한 결과, 우점종은Pseudomonas PI인 것으로 나타났다. 회분식 실험에서 초기 페놀농도, 균체량 및 glucose 농도 등을 변수로 실험하였느데, 페놀 분해속도는 시간에 따라 증가함을 나타내었다. 또한 페놀이 완전 제거되는데 소요되는 시간은 초기 페놀 농도에 비례하였으며, 균체 주입량에 다른 초기 MLSS농도의 대수식으로 나타낼 수 있었다. 연속식 활성 슬러지법에 의한 실험에 있어서, 본 실험조건에서 페놀이 완전 제거되는데 필요한 반응기내의 체류시간은 유입 페놀농도 500ppm인 경우 20시간이 소요되는 것으로 나타났다. This investigation was carried out to study the biodegradation of phenol in wastewater using mixed microorganisms. The mixed clutures of phenol degrading microorganisms were selected from various sources such as industrial wastewaters, sludges and soils. The mixed cultures could be adapted to high concentration of phenol by increasing the phenol concentration step by step. The phenol was degraded easily even up to 1,000ppm of phenol using these microorganisms. The predominant bacteria was isolated and characterized as Pseudomonas PI. In a batch system, the removal rate of phenol increased with time due to the lag time of microorganism adapation. The duration time during which phenol could be completely removed was linearly proportional to the initial phenol concentration. And the duration time(td) could be expressed as a funtion of logarithmic initial MLSS concentration(x) as follows. td=?? [8.68-In(x)] In a continuous system, the required residence time to remove phenol completely was found to be 20 hours and 35 hours 500 ppm and 800 ppm of influent phenol concentrations, respectively.
정재원,김일수,박창언,김학형,서주환,김인주,심지연 한국공작기계학회 2008 한국공작기계학회 춘계학술대회논문집 Vol.2008 No.-
The development of robotic welding process is a very complex assignment because the system is affected by a number of process parameters which are very difficult to determine or predict in practice. The full automation welding has not yet been achieved partly because the mathematical model for the process parameters of a given welding task is not fully understood and quantified. Several mathematical models to control welding quality, Productivity, micro structure and weld properties in arc welding processed have been studied. However, it is not an easy task to apply them to the various practical situations because the relationship between the process parameters and the bead geometry is non-linear and also they are usually dependent on specific experimental result. Practically, it is difficult, but important to know how to establish a mathematical model that can predict the result of the actual welding process and how to select the optimum welding condition under a certain constraint. In this paper, an attempt has been made to develop an neural network model to predict the back-bead width as a function of key process parameters in the GMA (Gas Metal Arc) welding and to compare the developed models with the experimental results
Temperature-independent pitch invariance in cholesteric liquid crystal.
Shim, Kyoo Sung,Heo, Jeong Uk,Jo, Soo In,Lee, You-Jin,Kim, Hak-Rin,Kim, Jae-Hoon,Yu, Chang-Jae Optical Society of America 2014 Optics express Vol.22 No.13
<P>We report a pitch invariance in cholesteric liquid crystals (CLCs) independent of temperature by mixing two chiral dopants. One dopant tends to shorten the helical pitch of the CLC, but the other makes the pitch longer, with increasing temperatures. From an analysis of temperature dependencies of the pitch for each dopant, we determined the mixing ratio of two chiral dopants for the pitch invariance. Finally, we obtained the pitch-invariant CLCs to temperature and the helical twisting power of the mixed dopant was estimated.</P>
( Hak-jun Kim ),( Sung-min Park ),( Hyun-joo Lee ),( Hyunju Jin ),( Hyang-suk You ),( Woo-haing Shim ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum Kim ) 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.1
Dermal melanocytosis is pigmentary disorder histologically characterized by the presence of intradermal melanin-containing melanocytes. It is clinically devided into several subtypes according to onset and location of lesion. Most forms of dermal melanocytosis are present at birth. However, there have been some reports of adult-onset dermal melanocytosis called acquired dermal melanocytosis (ADM). ADM usually occurs on the face, including acquired bilateral nevus of Ota-like macules, and the acquired nevus of Ota. But, Non-facial ADM which is known to be extremely rare, mainly affect the trunk and extremity. Herein, we report a rare case of 39-year-old women with blue-grayish patches on her face, upper back for one year. These lesions occured at the same time. She denied any preceding trauma, metal contact, discoloration and prior inflammatory lesion. Histopathologic examination showed multiple spindleshaped dendritic melanocytes in the dermis. We diagnosed this patient as ADM based on clinical manifestations and histopathology. Though ABNOM is not rare, ADM of the upper back is rare, and furthermore simultaneous occurrence of ADM of the upper back and ABNOM in this case seems to be quite rare.
Clinical characteristics of disseminated herpes zoster: a single centre experience
( Hak-jun Kim ),( Tae-wook Kim ),( Hyun-joo Lee ),( Sung-min Park ),( Hyunju Jin ),( Hyang-suk You ),( Woo-haing Shim ),( Gun-wook Kim ),( Hoon-soo Kim ),( Hyun-chang Ko ),( Byung-soo Kim ),( Moon-bum 대한피부과학회 2017 대한피부과학회 학술발표대회집 Vol.69 No.2
Background: Cutaneous dissemination of herpes zoster mainly occurs in immunocompromised patients. There are few reports focused on clinical characteristic and underlying disease of disseminated herpes zoster (DHZ) in Korea. Objectives: To describe clinical characteristics of DHZ, and to investigate the clinical difference between immunocompromised and immunocompetent groups. Methods: The patients diagnosed with DHZ in Department of Dermatology, Pusan National University Hospitals (Busan and Yangsan) from 2007 to 2017, were retrospectively reviewed. Results: A total of 26 patients were enrolled. The mean age was 63.3 years (range 35-82), and the male to females ratio was 4.2. Twenty (77%) patients had underlying disease; hypertension (46%) was most common, followed by malignancy (35%), and diabetes (27%). Fifteen (57.7%) patients were immunocompromised. Lumbar dermatome was most commonly involved (42.3%), and the average interval of dissemination was 2.6 days. The incidence of postherpetic neuralgia was higher in patients with DHZ, compared with ordinary herpes zoster (n=401, 30% versus 17.5%). There was no significant difference in involved area, treatment duration, and interval of dissemination between immunocompromised and immunocompetent group. (p>0.05) Conclusion: About half of patients with DHZ were immunocompromised. However, no clinical difference was observed between immunocompromised and immunocompetent groups.
심학보(Shim Hak-Bo),박수용(Park Soo-Yong),박효선(Park Hyo-Seon) 대한건축학회 2009 大韓建築學會論文集 : 構造系 Vol.25 No.4
The aim of this study is to estimate the compressive force of steel member using a system identification technique with vibration measurements. To date, several methods have been presented to estimate the compressive force using static and/or dynamic responses of the steel member. However, each and every one of these methods has its disadvantages as well as advantages in its procedures, level of accuracy, and equipment requirements. The paper reports a qualitative investigation of vibration under mono harmonic excitation. The methodology utilizes the relationship between the natural frequencies, the structural parameters, and the compressive force of the member. In this paper, experimental results are presented with a steel beam subjecting to several compressive forces and the proposed method is validated using both numerical and experimental data.
방사성 동위체도입과 그 추적기술에 의한 수도근계(水稻根系) 활성상의 해명과 개선에 관한 연구 : 특수성분 결핍 답토양에서의 용수조절 효과에 대하여(제1보)
안학수,정희돈,김규원,심상칠 한국농화학회 1972 Applied Biological Chemistry (Appl Biol Chem) Vol.15 No.1
A field experiment was conducted to determine the factors responsible in limiting nutrient up take and root activity in low productive paddy field. Radiosotope of phosphorus-32 was used as a tracer. Results of the study were as follows: 1. On yield components responsible for increase yield indicated that number of ears per panicle and ripening ratio were closely related to increase yield. 2. Root volume or root feeding area has significant influence in increasing rice yield. 3. Root volume indicative of root activity and nutrient uptake can be effected by reasonable water control. 4. The combined application of calcium, silica, and magnesium(as a fused magnesium phosphate. the Kyun-gi Chemical Co. products.) with water control, although under conditions of large amount application of nitrogen, was found to be increased the maturing rate. 5. In the plots of water control, the number of roots per one volume were less than that of the continuous flooding plots, but the weight per root was heavier than the flooding plot ones. 6. Improvement of the present native culture method could effectively increase paddy rice yield.