A study of a method for distribution analysis of skin color

Ha, Seunghan,Lee, Minhee,Lee, Onseok,Lee, Gunwoo,Kim, Jeayoung,Moon, Jongsub,Kim, Mingi,Oh, Chilhwan Blackwell Publishing Ltd 2009 SKIN RESEARCH AND TECHNOLOGY Vol.15 No.2

<P>Background/aims</P><P>The objective and quantitative assessment of the skin is important in medical and cosmeceutical research. Assessment of color is an important element for analyzing the surface of the skin, which is usually determined subjectively by a doctor or using color analysis devices. These devices, however, cannot provide correct color information because color is construed from the mean value of the observation region, and analysis of color distribution is impossible. The purpose of this paper is to develop an objective analysis method to permit skin color measurement of each pixel unit of an image and analyze the distribution of skin surface color.</P><P>Methods</P><P>The Skin Color Distribution Analyzer (SCDA) is an analysis method newly developed at the Research Institute for Skin Image at Korea University. The SCDA system presented in this paper performed a novel form of quantitative and objective analysis of skin color distribution using each pixel color model parameter found in image wavelength information.</P><P>In this paper, distribution analysis was conducted on normal skin and skin lesions and skin affected by artificially induced irritant contact dermatitis and pigmented nevous. The method selected a grade using a color model parameter. Twenty healthy Korean males participated in this study. A comparative study of the eight anatomical areas was performed, including the exposure and non-exposure parts and the medial aspect and the lateral aspect of the forearm. A reliability test for the SCDA system was also conducted with a spectrometer (SPEC) using the color analysis method.</P><P>Results</P><P>Each skin lesion was precisely segmented by grade and each parameter hada different statistical significance for results of analysis of distribution in pigmented nevous and the artificially induced irritant contact dermatitis. Parameters <I>L</I><SUP>*</SUP>, <I>b</I><SUP>*</SUP>, <I>a</I><SUP>*</SUP>, and EI showed salient traits. Showed resemble measured result in the SCDA system and the SPEC of normal skin. The exposed site, in comparison with the non-exposed site, showed a notable difference in the <I>L</I><SUP>*</SUP> parameter and a significant statistical difference in the <I>x</I> and <I>z</I> parameters, except <I>b</I><SUP>*</SUP>. The comparison of the medial and lateral aspects of the forearm showed a notable difference in the <I>L</I><SUP>*</SUP> parameter and a significant statistical difference in the parameters except <I>y</I> and <I>b</I><SUP>*</SUP>. In the reliability test result using the SCDA system and the SPEC, the SCDA system was highly reliabile in terms of the CV value in all color model parameters.</P><P>Conclusions</P><P>The color distribution analysis method using the SCDA system has revealed an aspect that the existent method of medical research has not shown, and is considered to be more reliable than other methods. This method can provide better study findings because it can be applied to other fields in addition to the medical science field and the ripple effect is thought to be bigger in other science field too.</P>

철 주입과 마이크로웨이브 처리 시 폐활성슬러지의 가용화율 및 인 제거

하승한 ( Seunghan Ha ),안종화 ( Johng-hwa Ahn ) 한국폐기물자원순환학회 2023 한국폐기물자원순환학회 추계학술발표논문집 Vol.2023 No.0

반응표면분석법을 이용한 제올라이트의 다중 중금속 흡착인자 최적화

하승한(Seunghan Ha),송진수(Jinsu Song),안종화(Johnghwa Ahn) 대한환경공학회 2022 대한환경공학회 학술발표논문집 Vol.2022 No.11

Associated Injuries in Spine Trauma Patients: A Single-Center Experience

( Seunghan Yu ),( Hyuk Jin Choi ),( Jung Hwan Lee ),( Byung Chul Kim ),( Mahnjeong Ha ),( In Ho Han ) 대한외상학회 2020 大韓外傷學會誌 Vol.33 No.4

Purpose: The purpose of this study was to determine the incidence and characteristics of associated injuries in patients with spine trauma. Methods: Data of 3,920 consecutive patients admitted to a regional trauma center during a 3-year period were analyzed retrospectively. Results: Of the 3,920 patients who were admitted to the trauma center during the 3-year study period, 389 (9.9%) had major spinal injuries. Among these 389 patients, 303 (77.9%) had associated injuries outside the spine. The most common body region of associated injuries was the extremities or pelvis (194 cases, 49.4%), followed by the chest (154 cases, 39.6%) and face (127 cases, 32.6%). Of these 303 patients, 149 (64%) had associated injuries that required surgical treatment such as laparotomy or internal fixation. Associated injuries were more common in patients with lumbar injuries (93.3%) or multiple spinal injuries (100%) than in those with lower cervical injuries (67.4%). There was a significant correlation between the location of the spinal injury and the body region of the associated injury. However, distant associated injuries were also common. Conclusions: Associated injuries were very common in spinal injury patients. Based on demographic groups, the trauma mechanism, and the location of spinal injury, an associated injury should be suspected until proven otherwise. Using a multidisciplinary and integrated approach to treat trauma victims is of the paramount importance.

Does the Probability of Survival Calculated by the Trauma and Injury Severity Score Method Accurately Reflect the Severity of Neurotrauma Patients Admitted to Regional Trauma Centers in Korea?

Ha Mahnjeong,Yu Seunghan,Lee Jung Hwan,Kim Byung Chul,Choi Hyuk Jin 대한의학회 2023 Journal of Korean medical science Vol.38 No.34

Background: Assessing and improving the quality of trauma care is crucial in modern trauma systems and centers. In Korea, evaluations of regional trauma centers are conducted annually to assess and improve trauma management quality. This includes using the Trauma and Injury Severity Score (TRISS) method to calculate the W-score and mortality Observed-toExpected ratio (O:E ratio), which are used to evaluate the quality of care. We analyzed the potential for overestimation of the probability of survival using TRISS method for patients with neurotrauma, as well as the potential for errors when evaluating and comparing regional trauma centers. Methods: We included patients who visited the regional trauma center between 2019 and 2021 and compared their probability of survival of the TRISS method, W-score, mortality O:E ratio, and misclassification rates. The patient groups were further subdivided into smaller subgroups based on age, Glasgow Coma Scale (GCS), and Injury Severity Score, and comparisons were made between the neurotrauma and non-neurotrauma groups within each subgroup. Results: A total of 4,045 patients were enrolled in the study, with 1,639 of them having neurotrauma. The neurotrauma patient group had a W-score of −0.68 and a mortality O:E ratio of 1.044. The misclassification rate was found to be 13.3%, and patients with a GCS of 8 or less had a higher misclassification rate of 37.4%. Conclusion: The limitations of using the TRISS method for predicting outcomes in patients with severe neurotrauma are exposed in this study. The TRISS methodology demonstrated a high misclassification rate of approximately 40% in subgroups of patients with GCS less than 9, indicating that it may be less reliable in predicting outcomes for severely injured patients with low GCS. Clinicians and researchers should be cautious when using the TRISS method and consider alternative methods to evaluate patient outcomes and compare the quality of care provided by different trauma centers.

A Reappraisal of the Necessity of a Ventriculoperitoneal Shunt After Decompressive Craniectomy in Traumatic Brain Injury

( Seunghan Yu ),( Hyuk Jin Choi ),( Jung Hwan Lee ),( Mahnjeong Ha ),( Byung Chul Kim ) 대한외상학회 2020 大韓外傷學會誌 Vol.33 No.4

Purpose: Cranioplasty itself is believed to have therapeutic effects on hydrocephalus. The goal of this study was to evaluate the hypothesis that not every patient with hydrocephalus after decompressive craniectomy needs cerebrospinal fluid diversion, and that cranioplasty should be performed before considering cerebrospinal fluid diversion. Methods: Data were collected from 67 individual traumatic brain injury patients who underwent cranioplasty between January 1, 2019 and December 31, 2019. Patients’ clinical and radiographic progression was reviewed retrospectively based on their medical records. Results: Twenty-two of the 67 patients (32.8%) had ventriculomegaly on computed tomography scans before cranioplasty. Furthermore, 38 patients showed progressive ventriculomegaly after cranioplasty. Of these 38 patients, only six (15.7%) showed worsening neurologic symptoms, which were improved by the tap test; these patients eventually underwent ventriculoperitoneal shunt placement. Conclusions: Cerebrospinal f luid diversion is not always required for radiologically diagnosed ventriculomegaly in traumatic brain injury patients after decompressive craniectomy. A careful clinical and neurologic evaluation should be conducted before placing a shunt.

ERAM as a complementary method of Spatial Syntax: comparison of methodologies by linking spatial analysis with income-producing efficiency for a retail outlet in South Korea

Ha SeoJin,Jang SuJin,Yang KwanWoo,Ro SeungHan 서울시립대학교 도시과학연구원 2020 도시과학국제저널 Vol.24 No.4

This study examines if quantitative spatial analysis techniques are methodologically suitable in terms of linking spatial characteristics with income-producing efficiency. Two methodologies, Space Syntax and Eigenvector Ratio of Adjacency Matrix (ERAM), were employed to conduct an empirical analysis of a retail outlet with a multi-storey structure. The first model is the integration value of Space Syntax and the second model is ERAM, which is a behaviourally developed version of Space Syntax. Thus, integration of Space Syntax, which calculates relative spatial depth, is found to not be significant to gross sales of stores, while ERAM value is found to be significant. By presenting methods to optimize space, this study contributed to how limited spaces of income-producing properties can be more efficiently used. The ERAM model yielded a value that is significant to gross sales of stores and could be used to estimate and further increase gross sales of stores when planning the inner spaces of income-producing properties.

Phase‐contrast hard X‐ray microscopy using synchrotron radiation for the diagnosis of onychomycosis

Lee, Onseok,Ha, Seunghan,Lee, Gunwoo,Kim, Jaeyoung,Huang, Jungyun,Jin, Kyeongsik,Oh, Chilhwan Wiley Subscription Services, Inc., A Wiley Company 2010 Microscopy research and technique Vol.73 No.12

<P><B>Abstract</B></P><P>Onychomycosis, or fungal infection of the nail, is a disease seen frequently in clinical settings. However, the rates of positive identification using potassium hydroxide preparations or fungal cultures are relatively low. Precise diagnosis is possible via histopathologic examination to monitor the existence of fungus and performance of a fungal culture for confirmation. Phase‐contrast hard X‐ray microscopy using synchrotron radiation provides 70‐nm spatial resolution and enables imaging of minute internal cellular structures. This study confirms the feasibility of diagnosing onychomycosis using a phase‐contrast hard X‐ray microscope developed at 1B2 beam line using a Pohang light source. Microsc. Res. Tech. 73:1110–1114, 2010. © 2010 Wiley‐Liss, Inc.</P>

A new design of light illumination scheme for deep tissue photoacoustic imaging

Wang, Zhaohui,Ha, Seunghan,Kim, Kang The Optical Society 2012 Optics express Vol.20 No.20

마필관리사에서 발생한 폐암 위험도 연구: 건강보험공단 빅데이터 12년 추적 연구

이승현 ( Seunghyun Lee ),김승한 ( Seunghan Kim ),윤세현 ( Sehyun Yun ),김규상 ( Kyoosang Kim ),윤진하 ( Jin-ha Yoon ) 한국산업보건학회 2021 한국산업보건학회지 Vol.31 No.4

Objectives: Horse trainers ensure the horses they are training and monitor horse's health, hygiene. While most of the studies on horse trainer’s health focused on musculoskeletal disorders, few studies have examined the health effect of occupational exposure. This study aimed to investigate the risk of lung cancer in Korean Horse trainers. Methods: Among the largest health screening program of health screening service of the National Health Insurance Corporation, 2,246 workers were selected for study. We utilized data from the National Health Insurance Service (NHIS) National Cohort Data Base 2005-2017. We performed analyses using a Cox’s proportional hazards model to identify the risk of lung cancer in Horse trainers. Results: This study found that the horse trainers group had a higher risk of lung cancer 10.07 (95% CI :2.38-42.64) compared to other occupational group. Additionally, there was 6.5 times higher risk of lung cancer in non-smoker horse trainers group. Conclusions: We, thus, verified horse trainers could have relation with increase of lung cancer risk. As lung cancer is known as a cancer with a high contribution of occupational factors compared to other cancers, it is necessary to determine the efficacy of continuous attention and active management of occupational exposure.