주사 레이저 광집게를 위한 압전 구동기 주파수 특성 분석과 주사 경로 추적 및 보상

황선욱,이송우,이용구,Hwang, Sun-Uk,Lee, Song-Woo,Lee, Yong-Gu 한국광학회 2008 한국광학회지 Vol.19 No.2

주사 레이저 광집게에서 대물렌즈에 의해 집속된 레이저 초점을 제어하기 위해 사용되는 고속 구동기는 입력 신호의 주파수가 증가함에 따라 출력이 감소한다. 이러한 입출력의 괴리는 CCD 카메라를 통해 관찰이 어려우며 사용자는 희미하게 보이는 레이저 주사 형상을 보고 물체를 조작하여 물체를 포획할 수 없거나 포획하더라도 안정된 제어를 할 수 없다. 본 연구에서는 이러한 문제를 해결하기 위해 사용된 고속 구동기의 주파수 특성을 분석하고, 이를 바탕으로 입력 주파수에 따른 실제 주사 경로를 측정하여 시각화해주는 방법과 입출력 데이터의 차이를 계산하여 입력 데이터를 보상하는 방법을 제안한다. In scanning laser optical tweezers, high speed scanning stages are used to manipulate a laser beam spot. Due to the inertia of the stage, the output scanning signal decreases with increased frequency of the input signal. This discrepancy in the signals is difficult to observe since most of the energy from the laser beam is blocked out to avoid CCD damage. In this paper, we propose two methods to alleviate these problems. Firstly, frequency responses of piezo stages are measured to analyze the signal drops and the input signal is compensated accordingly. Secondly, an overlay of the scanning path is drawn on the live monitoring screen to enhance the visibility of the scanning path. The result is a drop-compensated scanning with clear path view.

"승애일찬(升厓日纂)"에 관한 소고(小考)

황선욱,윤현주,정진강,Hwang, Sunwook,Yoon, Hyun-Ju,Chong, Chin-Kang 한국수학사학회 2014 Journal for history of mathematics Vol.27 No.1

The book Su Hak Ip Mun(數學入門, Introduction to Mathematics) is one part of 5 sections of the book Seung Aeh Ill Chan(升厓日簒), which is a hand written manuscript in Chinese characters and the author and the date of writing is unknown. The book Seung Aeh Ill Chan begins with the song of division table so called Guguiga(九歸歌). We first investigate and compare the writing pattern of this with other old Korean mathematical books. Next, we investigate typical expression and calculation methods of mathematical contents and terminologies used in Su Hak Ip Mun and also figure out oddities of writing pattern of mathematical expression and cultural circumference of several problems dealt in the book. From these analysis and investigation, we estimate the writing date of Su Hak Ip Mun later than the year 1723 on which Su Ri Jeong On(數理精蘊) was first published. And we presumably guess that Guguiga and Su Hak Ip Mun are made not for practical use or theoretical purpose but for text to teach students.

기하학적 문제와 펜토미노의 발명을 통한 수학 학습에서의 자료 개발

황선욱,심상길,Hwang, Sun-Wook,Shim, Sang-Kil 한국수학사학회 2007 Journal for history of mathematics Vol.20 No.1

최근 수학교육에서 펜토미노와 같은 절단 퍼즐들을 학습에 많이 활용하고 있다. 그러나 이런 퍼즐들의 개발 배경과 수학적 활용 방법에 대한 연구 부족으로 수학적 개념 도입이나 문제해결을 위한 소재로서 다양하게 사용되고 있지 못한 실정이다. 이 논문은 펜토미노를 수학 학습에서 효과적으로 활용하기 위하여 펜토미노와 같은 절단 퍼즐의 배경이 되는 기하학적 문제와 펜토미노의 개발에 관한 수학사적 배경을 알아보고, 제 7차 초등학교 교육과정의 수학 교과서에서 활용할 수 있는 단원과 여러 문헌에서 펜토미노를 활동한 자료를 조사하여 체계적인 수학 학습자료를 개발하는 기초 자료와 방향을 제시하는 데 그 목적이 있다. Recently, dissection puzzles such as pentominoes have been used in mathematics education. But they are not actively applicable as a tool of problem solving or introducing mathematical concepts since researches about the historical background and developments of mathematical applications of such puzzles have not been effectively accomplished. In this article, in order to use pentominoes in mathematical teaming effectively, we first investigate geometric problems related to dissection puzzles and the historic background of development of pentominoes. And then we collect and classify data related to pentomino activities which can be applicable to mathematics classes based on the 7th elementary school national curriculum. Finally, we suggest several basic materials and directions to develop more systematic learning materials about pentominoes.

진행암 환자의 증상군

황선욱,Hwang, Sun Wook 한국호스피스완화의료학회 2013 한국호스피스.완화의료학회지 Vol.16 No.3

진행성 암환자들은 동시에 여러 가지 증상을 겪고 있으며 그 정도가 중등도 이상으로 매우 높은 편이다. 환자 증상 조절을 위해 지금까지는 통증, 우울증, 피로 등 여러 각각의 증상에 대해서 치료하는 방법에 대해서 주로 연구 되어서 많은 발전이 있었지만 진행성 암환자의 특성상 동시에 발생하는 여러 가지 증상을 동시에 조절하는 데에는 한계가 있다. 따라서 최근에는 더욱 효과적인 증상 조절을 위해 이러한 각각의 증상에 대한 접근 방법에서 동시에 발생하는 여러 증상군(symptom cluster)에 대한 접근 방법에 대한 연구가 진행되고 있다. 증상군은 원인과 기전에 상관없이 다른 군과 독립적이면서 2개 이상의 서로 연관성 있는 동시에 발생하는 증상을 의미한다. 진행성 암환자에서 이러한 증상군을 이용하여 증상들 간에 연관성, 공통된 기전 등을 이해하면 개별 증상 치료보다 더 효과적으로 조절할 수 있고 약물 부작용 등을 줄일 수 있다. 또한 다른 증상을 예측할 수 있고 환자의 기능 평가, 생존 예측에도 도움이 된다. 아직 밝혀지지 않은 기전이 많고 증상 측정 도구와 인자 분석 방법이 다양하기 때문에 증상군이 일정하지 않은 면이 있지만 더욱 많은 연구를 통해서 효과적인 증상 조절과 삶의 질 향상에 기여하게 될 것이다. Advanced cancer patients tend to present multiple concurrent symptoms which are often moderate or severe in intensity. To date, the majority of studies have focused on either a single symptom, such as pain, fatigue, or depression or associated symptoms. While this approach has advanced understanding of some symptoms, it has offered clinicians not much guidance for treating several multiple concurrent symptoms in cancer patients. So in recent years, a few symptom management studies attempted a new approach of focusing on symptom clusters instead of individual symptoms. A symptom cluster is defined as two or more concurrent symptoms that are related to each other. If we better understand symptom clusters, interrelations of symptoms, and their common mechanisms in advanced cancer patients, clinicians can more effectively control multiple, concurrent symptoms and reduce drug side effects. And clinicians can also predict any other symptoms, functional performance, and the relationship between symptom clusters and survival in advanced cancer patients. At present, there is inconsistency in symptom clusters due to many unexplained mechanisms and various means to assess and analyze symptoms. Still, with further study, the approach to symptom clusters rather than individual symptoms could more effectively control symptoms and improve patients' quality of life.

반복된 열상 후 조갑하 소피에 발생한 점액성 신경섬유종

황선욱 ( Seon Wook Hwang ),강주현 ( Ju Hyun Kang ),김상현 ( Sang Hyun Kim ),서종근 ( Jong Keun Seo ),이드보라 ( Deborah Lee ),성호석 ( Ho Suk Sung ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.3

We report a case of a 32-year-old woman with a myxoid neurofibroma occurring on the hyponychium of the 4th finger following repeated laceration. The tumor was histologically determined to be a myxoid neurofibroma. Myxoid neurofibroma may present as a sporadic lesion or in the context of neurofibromatosis 1. Although there is no predilection site of solitary lesion, occurrence on the hyponychium is rare. We report a case of solitary neurofibroma on the hyponychium of the 4th finger following repeated laceration. (Korean J Dermatol 2008;46(3):391∼393)

주관절에 발생한 증식성 모낭종

황선욱 ( Seon Wook Hwang ),홍순권 ( Soon Kwon Hong ),오두진 ( Doo Jin Oh ),이드보라 ( Deborah Lee ),김정욱 ( Jung Wook Kim ),박성욱 ( Sung Wook Park ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.3

Proliferating trichilemmal cyst is a rare benign tumor of external root sheath origin that usually occurs on the scalp of elderly women. It is rarely found on the face, neck, trunk and back. A 17 year-old man presented with a skin- colored, subcutaneous, tender nodule on the elbow with a history of bee sting. A histological examination revealed a well demarcated multilobular cystic mass characterized by trichilemmal keratinization in the dermis. The skin lesion was totally excised and recurrence has not been found. We present a case of proliferating trichilemmal cyst of unusual predilection site. (Korean J Dermatol 2008;46(3):381∼383)

IPL 치료 후 발생한 Intravascular Papillary Endothelial Hyperplasia

황선욱 ( Seon Wook Hwang ),조경종 ( Kyung Jong Cho ),강주현 ( Ju Hyun Kang ),이드보라 ( Deborah Lee ),김정욱 ( Jung Wook Kim ),박성욱 ( Sung Wook Park ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.2

Intravascular papillary endothelial hyperplasia (IPEH) is a rare benign vascular tumor characterized by the development of endothelial-lined papillary projections in the vascular lumen. Most authors believe that IPEH represents an unusual pattern of organizing thrombus, implying that a thrombus is the initial cause. A 13-year-old boy came to hospital because of a purpuric patch and violaceous plaque on his right forearm. Clinically, the lesions were thought to be a hemangioma or other vascular malformation. Therefore, we treated him with intense pulsed light (IPL) four times. After treatment, the initial skin lesions were erythematous and edematous and a new bluish mass and multiple scattered subcutaneous nodules appeared near the original skin lesions. Histologic examination of the new bluish mass showed an organic thrombus and endothelial-lined capillary projections in the dilated vascular lumen, compatible with IPEH. Here, we report an interesting case of IPEH after IPL treatment in a 13 year-old boy. (Korean J Dermatol 2008;46(2):234∼237)

비정형 공간에서 그룹주행을 위한 경로생성 시스템 구현

황선욱(SunWook Hwang),이석규(SeokKyu Lee),박성민(SungMin Park),정임수(ImSu Jung) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11

안 합병증이 동반된 아토피 피부염의 임상적 특징

황선욱(Seon Wook Hwang),박성욱(Sung Wook Park),왕한영(Han Young Wang),윤일한(Il Han Yoon) 대한피부과학회 2001 대한피부과학회지 Vol.39 No.5

N/A Background: Long-standing atopic dermatitis patients frequently predispose to ocular complications. The ectoderrnal origin of the epidermis and of many eye structures explain the fre~quent associations observed in atopic dermatitis. Objective: This study may help in evolving early diagnosis a~nd in formul~ating standard therapeutic strategies to prevent and treat ocular complications by studying the types, frequency and dermatological characteristics of each ocular complication in atopic dermatitis. Methods: We evaluated the ocular complications of 4I typical atopic dermatitis patients(26 males, 15 females) who had skin lesion around eyelids or complained of ocular symptoms. Results: Mean age of the patients was 17.7 years. The onset of atopic dermatitis was during infancy in 21 patients, during chiildhood in 15 patients, and during adult in 5 patients and their mean duration of disease was 13.8 years. Mild ocular involvements including blepharitis in 29 patients(58 eyes, 70.7%), keratoconjunctivitis in 29 patients(58 eyes, 70.7%) were seen. More serious com- plications which may lead to decreased visual function including cataracts in 5 patients(10 eyes, 12.1%), retinal detachments in 3 patients(5 eyes, 6.0%) were seen. All the patients who had these two s~erious complications had facial dermatitis. And other ocular invo~lvements including keratoconus in 2 patients(2 eyes, 2.4%), ocular herpes simplex in 1 patient(2 eyes, 2.4%), uveitis in 2 patients(2 eyes, 2.4%) were seen. Conclusion . It is important to perfonn an ophthalmologic examination in the earl~y period of disease in long-standing atopic dermatitis patients especially those who have facial dermatitis for the early diagnosis and treatment of serious sight-threatening complications.

한의원 침술 후 발생한 이영양성 피부석회증

황선욱 ( Seon Wook Hwang ),조경종 ( Kyung Jong Cho ),홍순권 ( Soon Kwon Hong ),서종근 ( Jong Keun Seo ),이드보라 ( Deborah Lee ),성호석 ( Ho Suk Sung ) 대한피부과학회 2008 대한피부과학회지 Vol.46 No.6

Accumulation of calcium in the skin is usually classified as a group of disorders referred to as calcinosis cutis. Based on pathophysiologic mechanisms, it has been classified as metastatic, dystrophic, idiopathinic and iatrogenic calcinosis cutis. Local tissue injury due to repetitive trauma by an acupuncture needle can cause dystrophic calcinosis cutis. A 61-year-old woman developed hyperpigmented pea sized subcutaneous nodules on the right side of her lower abdomen. She had received several sessions of acupuncture treatments on the right abdomen in a herb medicine clinic. A biopsy specimen showed amorphous basophilic deposits in the dermis and serum levels of calcium, phosphate were within the normal range. We report a case of dystrophic calcinosis cutis following acupuncture treatments by a herb medicine doctor. (Korean J Dermatol 2008;46(6):839∼841)