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THE NUMBER OF CONFIGURATION ON RECTANGULAR ARRAYS
JI HYUN PARK,WAN SOO JUNG,DAE YEON PARK 충청수학회 1995 충청수학회지 Vol.8 No.1
In this paper, we derive the formular that the number of configuration on the rectangular arrays is counted by the composite shift operator method.
( Ji Hyun Park ),( Haneul Oh ),( Tae Jun Park ),( Il-hwan Kim ) 대한피부과학회 2019 대한피부과학회 학술발표대회집 Vol.71 No.2
Background: Laser treatment is commonly used in pigmentary disorders but unlike the expectation of patients, the recurrence or the reactive hyperpigmentation is common. Therefore, it is essential to identify the regeneration process after removal of pigment, and develop the strategies to overcome the limitation of existing treatment. Objectives: The study investigated the regeneration process in time series after removal of melanocytes in zebrafish by 1,064nm Q-switched Nd:yag (QSNY) laser and the presence of melanocyte progenitor cells. Methods: Adult zebrafish were irradiated by 1,064nm QSNY laser. After laser ablation we obtained the biopsy samples in time serial from the ablated tissue until 20 days. Specimens were immunohistochemically stained with sox10 and mitfa antibody and were observed usi Results: After 5days after laser ablation, the pigments were totally eliminated.The sox10 positive cells were observed in 5 to 10 days follow ups. The mitfa positive cells were also observed in 5 to 10days follow ups. In bright field, the pigmented cells appeared from 7days follow ups. In the early stage of pigment regeneration, the increase of cell count were observed and in the late stage, the increase of the amount of pigment were observed. Conclusion: The regeneration of pigment after laser treatment was found to occur explosively in about 1 week, and the appearance of melanocyte progenitor cells before the appearance of differentiated melanocytes could be predicted as a result of this study.
Simple ZF Equalization Method for OFDM Systems in Time-Varying Channels
Ji-Hyun Park,Keum-Chan Whang 대한전자공학회 2007 ITC-CSCC :International Technical Conference on Ci Vol.2007 No.7
In this paper, we propose a low complexity zeroforcing (ZF) equalization scheme to mitigate intercarrier interference (ICI) in OFDM systems due to time-varying multipath channels. The proposed method exploits a numerical approximation for matrix inversion based on Neumann’s Series (truncated first or second order) and takes advantage of banded channel matrix. Complexity analysis and simulation results show that the proposed scheme maintains almost the same performance as the classical banded ZF approach, while offering the advantage of computational cost significantly.
P079 A comparison of diagnostic accuracy and consistency of dermoscopy in several skin diseases
( Ji Hyun Park ),( Ji Min Lee ),( Jung Jin Shin ),( Bo Young Kim ),( Sang Wook Son ),( Hwa Jung Ryu ),( Il-hwan Kim ) 대한피부과학회 2016 대한피부과학회 학술발표대회집 Vol.68 No.2
<div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div><div style="display:none">fiogf49gjkf0d</div> Background: Dermoscopy is a well known useful diagnostic tool in dermatology. There are many reports that dermoscopy provides the key clues. However clinician generally confirm the diagnosis with a skin biopsy, not with the dermoscopy. Objectives: The study investigated the diagnostic accuracy rate of the clinical diagnosis with dermoscopy about four disease entities that are well known of dermoscopic check points. (acral melanoma, seborrheic keratosis, basal cell carcinoma and dermatofibroma) Methods: Total 68 patients with biopsy-proven diseases were selected and analyzed retrospectively. We compared the dermoscopic diagnosis and the histopathologic diagnosis. Results: Dermoscopy was found to be a ‘good’ statistical value, analyzing the consistency with histopathologic diagnosis. (Weighted Kappa = 0.778) The diagnostic accuracy was mostly high in seborrheic keratosis(93.7%) and basal cell carcinoma(93.7%) and relatively low in acral melanoma(81.85%) and dermatofibroma(80%). Conclusion: This study revealed that examination using dermoscopy is a noninvasive, accurate diagnostic tool in certain disease. There are possibility of misdiagnosis however considering pros and cons, dermoscopy can be a diagnostic tool without an additional skin biopsy especially in basal cell carcinoma and seborrheic keratosis.
Determinants of Well-Being in Later Life: Focusing on Their Volunteering Experiences
Jihyun Park,Hongjik Lee 대한스트레스학회 2011 스트레스硏究 Vol.19 No.4
본 연구는 중ㆍ장년의 삶의 만족도에 영향을 미치는 요인을 이들이 참여하는 자원봉사활동을 중심으로 탐색하였다. 본 연구는 수도권에 거주하는 만 45세 이상 자원봉사활동 참여자 274명을 대상으로 하였다. 분석결과, 자원봉사에서 할당된 활동, 개인적 효율성, 자원봉사 센터의 지지, 집단간 조화, 역할만족도는 삶의 만족도와 통계적으로 유의한 상관관계를 나타났으며, 회귀모형에서는 자원봉사에서 할당된 활동, 개인적 효율성이 통계학적으로 유의하게 이들의 삶의 만족도 수준을 결정짓는 요인으로 나타났다. 또한, 인구사회학적 특성을 동시에 고려한 통합회귀모형에서도 역시 자원봉사에서 할당된 활동과 개인적 효율성은 여전히 통계학적으로 유의하게 삶의 만족도에 영향을 미치는 것으로 나타났다. 본 연구는 이러한 연구결과를 토대로 중ㆍ장년층의 삶의 만족도를 증진시키기 위한 자원봉사운영에의 함의를 전달하였다. This study aimed to explore the factors that affect on their positive psychological well-being among older adults. Especially, it tried to examine how their volunteering work experiences affect their level of psychological well-being. The data of the Volunteerism among Older Adults between U.S. and South Korea by the Center for Excellence in Aging Services and Community Wellness (CEASCW) in 2010 were used for this purpose. 274 older volunteers in South Korea were adopted as the data of this study. This study conducted the descriptive analyses, correlation analysis and multiple regression analyses to explore the determinants of their psychological well-being. In the regression model, by adding socioeconomic characteristics, two antecedent factors-work assignment and personal efficacy were statistically significant. This result suggests that older volunteers with higher level of work assignment achieved and satisfaction with personal efficacy are more likely to present the higher status of well-being in later life. Therefore, volunteer agency should be took for older volunteers to consider the determinants of satisfaction in order to increase the retention rate of volunteering and improve psychological well-being in later life. (Korean J Str Res 2011;19:333∼342)
Strategic Cooperation and Failure in Innovation Processes
Ji-hyun Park,Seong-hoon Gwon,Soon-ki Hong 대한산업공학회 2013 Industrial Engineeering & Management Systems Vol.12 No.1
The aim of this paper is to analyse the impacts of R&D cooperation and obstacles to technological innovation on the innovation failure of the Korean manufacturing firms. Two hierarchical regression models including interaction variables are employed for the analysis. Some interesting findings are: first, almost all the obstacles have positive and significant effects on the failure. Second, R&D cooperation positively or negatively moderates the impact of obstacles to technological innovation on the innovation failure, although R&D cooperation itself is not directly related to the failure. Third, the interaction effects between the cooperation and the obstacles influence the failure in various manners. This study is expected to help manufacturing firms which are under unfavourable environments to formulate their cooperation strategies successfully based on what they learn from the failure.