Light-extraction efficiency control in AlGaN-based deep-ultraviolet flip-chip light-emitting diodes: a comparison to InGaN-based visible flip-chip light-emitting diodes.

Lee, Keon Hwa,Park, Hyun Jung,Kim, Seung Hwan,Asadirad, Mojtaba,Moon, Yong-Tae,Kwak, Joon Seop,Ryou, Jae-Hyun Optical Society of America 2015 Optics express Vol.23 No.16

<P>We study light-extraction efficiency (LEE) of AlGaN-based deep-ultraviolet light-emitting diodes (DUV-LEDs) using flip-chip (FC) devices with varied thickness in remaining sapphire substrate by experimental output power measurement and computational methods using 3-dimensional finite-difference time-domain (3D-FDTD) and Monte Carlo ray-tracing simulations. Light-output power of DUV-FCLEDs compared at a current of 20 mA increases with thicker sapphire, showing higher LEE for an LED with 250-관m-thick sapphire by ~39% than that with 100-관m-thick sapphire. In contrast, LEEs of visible FCLEDs show only marginal improvement with increasing sapphire thickness, that is, ~6% improvement for an LED with 250-관m-thick sapphire. 3D-FDTD simulation reveals a mechanism of enhanced light extraction with various sidewall roughness and thickness in sapphire substrates. Ray tracing simulation examines the light propagation behavior of DUV-FCLED structures. The enhanced output power and higher LEE strongly depends on the sidewall roughness of the sapphire substrate rather than thickness itself. The thickness starts playing a role only when the sapphire sidewalls become rough. The roughened surface of sapphire sidewall during chip-separation process is critical for TM-polarized photons from AlGaN quantum wells to escape in lateral directions before they are absorbed by p-GaN and Au-metal. Furthermore, the ray tracing results show a reasonably good agreement with the experimental result of the LEE.</P>

봉독약침이 류마티스 관절염 환자의 관절 통증, 종창 및 급성 염증 반응에 미치는 영향

이상훈,이현종,백용현,김수영,박재경,홍승재,양형인,김건식,이재동,최도영,이두익,이윤호 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-

Objective In order to study the effects of bee venom(BV) on the pain, edema, and acute inflammatory reactant of rheumatoid arthritis(RA) patients. Methods Patients with RA who met the ACR(American College of Rheumatology) 1987 revised criteria for the diagnosis of RA were treated with the BV therapy twice a week for 3 months. Tender Joint counts, swollen joint counts, Visual analog scale(VAS), morning stiffness, ESR. C-reactive protein(CRP) were analyzed before and after BV therapy. Results The results as follows. 1. Tender joint counts in patients after BV therapy were significantly lower than those before BV therapy(9.0±7.9 vs 15± 11.4, p=0.002). 2. Swollen joint counts of the patients after BV therapy were significantly lower than those before BV therapy(50±61 vs 15±23, p=0.001). 3. VAS in patients after BV therapy was significantly lower than those before BV therapy(608± 17.6 vs 380± 159, p=0.000). 4. Duration of morning stiffness in patients after BV therapy was significantly reduced compared with that before BV therapy(119.1± 112.6 min vs 59.0±89.7 min, p=0.009). 5. ESR and CRP were not significantly changed before and after BV therapy, suggesting BV itself could make inflammatory reaction as well as therapeutic effect. Conclusions BV therapy improved tender joint counts, swollen joint counts and duration of morning stiffness in this study, and further study is needed on long-term effect of BV therapy.

봉독약침이 류마티스 관절염 환자의 기능회복 및 삶의 질에 미치는 영향

이상훈,이현종,박상민,김수영,박재경,홍승재,양형인,이재동,최도영,김건식,이두익,이윤호 WHO COLLABORATING CENTRE FOR TRADITIONAL MEDICINE 2003 東西醫學硏究所 論文集 Vol.2003 No.-

Objective: To evaluate the effects of bee venom acupuncture(BVA) on the rehabilitation and quality of life in rheumatoid arthritis(RA) patients Methods: Patients with RA were treated with the BVA therapy twice a week for 3 months. Tender joint counts, swollen joint counts, morning stiffness, Erythrocyte Sedimentation Rate(ESR), C-reactive protein(CRP), patient global assessment, physician global assessment, Korean health assessment questionnaire(KHAQ) were estimated and analyzed before and after BVA therapy. Results: Tender joint counts, swollen joint counts, morning stiffness showed significant decrease after BVA therapy. But, as acute inflammatory reactants, ESR showed no significant difference and CRP showed significant increase after BVA therapy. Patient global assessment physician global assessment, and KHAQ index showed significant improvement after BVA therapy. Conclusions: BVA therapy can improve rehabilitation and health-related quality of life RA patients as well as clinical symptom and signs. Further study is required in more population with large scale including acute inflammatory reaction of BVA therapy.

내시경적 점막절제술로 치험한 식도 과립상 세포종 1례

강혁주,김성욱,최석진,이중현,장재식,서영범,윤병구,박건욱,김성자,김용섭,강승완,이구,양창헌,이창우,김욱년,이광헌,서정일 동국대학교 의학연구소 2000 東國醫學 Vol.7 No.-

과립상 세포종은 Schwann 세포 기원으로 생각되며 인체에 비교적 드물게 발생한다. 과립상 세포종은 전신 어느 곳에서나 발견될 수 있으나 주로 혀, 구강, 피부 혹은 유방 등에서 호발하며 드물게 위장관에서 발견된다. 위장관에서는 식도에서 가장 호발하며 다음으로 위, 대장 순이다. 과립상 세포종은 대부분, 특히 위장관에서는 양성이며 소수의 악성 병변이 보고되었다. 이러한 이유와 함께 수술 전의 진단이 어렵기 때문에 과립상 세포종에 대한 근본적인 치료는 현재까지 외과적 절제술이다. 최근에 시도되는 치료방법들로는 내시경적 레이저 치료, 용종절제술, 내시경적 점막 절제술 등이 있다. 저자들은 상부 소화관 내시경검사를 시행하여 식도 과립상 세포종을 진단하고 내시경적 점막 절제술을 시행하여 합병증 없이 퇴원하여 현재 재발없이 경과 관찰중인 1례를 경험하였기에 보고하는 바이다. Granular cell tumors, which occur infrequently, are probably of Schwann cell origin. They can occur almost anywhere in the body but usually affect the tongue, oral cavity, skin, or breasts and are rarely found in the gastrointestinal tracts. The esophagus is the most frequent gastrointestinal site, followed by the stomach and the colon. Granular cell tumors are generally benign, especially in the gastrointestinal tract, some malignant lesions have been reported. For this reason, and also because preoperative diagnosis is difficult, the standard treatment for granular cell tumor has until now been surgical excision. In recent years, other therapeutic methods is endoscopic laser therapy (ELT), polypectiomy, endoscopic mucosal resection (EMR). We report a case of esophageal granular cell tumor which was diagnosed by an endoscopy and managed using an endoscopic mucosal resection without complication.

[논문]선박의 충돌회피시스템에 관한 연구

이승건,윤지현 釜山大學校生産技術硏究所 2004 生産技術硏究所論文集 Vol.63 No.-

많은 선박사고 유형증 하나인 선박의 충돌은 운항자의 조선실수가 그 원인의 큰 비중을 차지한다. 이는 점차 대형화,고속화되는 선박의 충돌회피를 단지 인간의 시각, 지각능력에만 의존하면서 나타나는 현상이라 할 수 있으며 이에 대비 하기위해 나날이 발전하는 첨단기술을 바탕으로 충돌회피에 관한 자동회피제어시스템의 개발의 필요성이 점차 대두되고 있다. 그러한 취지에서 본 연구도 충돌회피를 위한 자동제어에 관하여 연구되었다. 본 연구는 MMG 수학모텔에 기반을 두어,surge-sway-yaw-roll 운동방정식을 사용하였고, 충돌위험도 설정을 위하여 퍼지이론을 사용하였다.

[논문]Pleasure Boat( 레저선박)의 안전 및 대책현황

이승건,정재훈 釜山大學校生産技術硏究所 2008 生産技術硏究所論文集 Vol.67 No.-

최근 국민소득이 증가함에 따라 플레져 보트의 보급이 활성화되면서 안전사고 방지에 대한 실용적인 안전대책이 요구되어져 왔다. 또한 해마다 크고 작은 플레져 보트의 사고사례가 빈번히 발생하고 있음으로서,본 기술동향 보고에서는 우선 플레져 보트에 대한 국내 보급현황 및 운용실태 분석을 수행하고 운항안전 및 인명안전 측면에서 구체적이며 실용적인 대책 방안에 대하여 살펴보았다. 그리고 플레져 보트에 대한 종류와 정의를 이해하고 국내 해양사고사례를 조사하여 국내외 문헌조사 등을 이용한 플레져 보트의 안전과 대책현황에 관해 소개하고자 하였다.

[논문]최근 5년간 선박의 해양사고 심층분석

이승건 釜山大學校生産技術硏究所 2003 生産技術硏究所論文集 Vol.62 No.-

최근 5 년간 선박의 해양사고 심층분석

치성감염에 의해 발생된 후측인두부 및 종격동 농양

이승호,정종철,김건중,정주성,유선열,박문성,김창룡 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4

Odontogenic infections are usually locally confined, self-limiting processes. However, under certain circumstances, they may break through the bony, muscular, and mucosal barriers and spread into contiguous fascial spaces or planes far from the initial site of involvement, resulting in severn life-threatening complications, such as retropharyngeal spread, suppurative mediastinal extension, airway obstruction, pleuropulmonary suppuration, and hematogenous dissemination to distant organs. The mortality arte for mediastinitis from odontogenic infection ranges from 40% to 60%. Therefore rapid evalution and treatment is essential with a combination of life support, antibiotic therapy, and surgical intervention. Recently, we experienced three cases of retropharyngeal and mediastinal abscesses secondary to odonogenic infections. In all patients, early diagnosis was possible by CT scanning and physical examination. The prognosis was good in all patients by using urgent aggressive surgical and antibiotic therapy.

지방정부 행정서비스에 대한 주관적 평가 : 영천시를 중심으로 The Case of Yeong-cheon City

송건섭,이승철,유영애,이소영 大邱大學校 社會科學硏究所 2003 社會科學硏究 Vol.11 No.1

이 글은 지방정부의 민원행정서비스 만족도를 평가하고, 개선방안을 제시하는데 목적을 두었다. 연구는 경북 영천시를 대상으로 설문조사를 실시하여 분석하였다. 분석결과, 첫째, 민원행정서비스는 친절하고 신속하게 이루어졌지만, 과거 획일적이고 공급자 위주의 행정을 탈피하여 수요자 중심의 행정을 전개하기 위해 서비스 차별화 전략이 필요하다. 둘째, 민원행정서비스에 대한 만족도는 전체적으로 매우 높은 것으로 나타났다. 특히 민원사항에 대한 충분한 설명과 지식, 정보제공, 민원인을 대상으로 한 간단한 문서교육 등이 필요하다. 셋째, 민원시책에 대해서는 만족도가 낮았다. 이를 제고하기 위해서는 전체주민을 고려한 행사, 다양한 방법 (각종매체, 모임)을 통한 홍보활동전개, 특정한 날을 정하기보다는 상시적인 행사, 시의 편리한 시간에 행사 일을 맞추기보다는 주민의 시간을 고려한 행정 등이 필요하다. 마지막으로 민원행정서비스에 대한 개선책으로 각종 법규정비의 간소화가 중요하다. 또 복합민원만을 one-Stop, non-stop으로 처리할 수 있는 별도의 민원 부서가 필요하다. This paper propose to evaluate satistaction and policy orientation of civi1 service in Local government. Its analyze through questionnaire method in case of Yeong-cheon city, Gyeongbuk. The results of this study are as follows: First, civil service enforce friendly and speed, but its need defficiental strategy of civil service to deployment custommer-oriented administration deviate from fixed supply-oriented administration of the past. Second, the satisfaction of civil service totally high. Especially, its need explanation and knowledge sufficiently for civil service, furnishment of information, document education for citizen etc. Third, the satisfaction of civil program somewhat low. In order to the rise service program satisfaction, local government should open citizens’ events, public relation through mass media, civil conference, simplicity of law etc.

노인틀니 보험급여를 위한 틀니수가 산정법에 관한 조사연구

김용준,신승철,이건수 단국대학교 치과대학 예방치과 1998 예방치과 세미나집 Vol.- No.12

The use of insurance to help spread the financial burden attendant upon geriatric populations in Korea is of a governmental issue. Much of recent issues is the effort to apply this principle to current dental expenses. Therefore, the purpose of this study was to provide a guideline for the national oral health care policy of the insurance payment system for denture service. An opinion survey form was mailed to an approximately 10% of general dental practitioners (1,164) and 260 returned survey responses were analysed. Also, conducted were a telephone interview with 64 general dental practitioners who were willingly participated out of initial contact of 80 practitioners concerning all expenses incurring for the maintenance of dental clinics and personnel. Preexisting informations concerning the dental technician's fee schedule and the cost of materials needed for the construction a denture were also compiled from the Korean Dental Technician's Association and the Korean Association for Dental Materials and Instruments for the actuarial cost to determine the total budget and insurance payment for the denture services of geriatric population in Korea. The results were al follow. 1.A 64.6% of dentists agreed to as a carrier of beneficiary of national denture services for a group of more than 70 years of age. A 73.5% of dental practitioners responded that the selection of the carrier of beneficiary of the responses agree to expand the denture service to all prosthodontic patients. 2. As far as the area of national insurance plans for denture services are concerned, a 93.9% and a 77.5% agreed in the resin-based full dentures only for full denture and in the non-precious metal cast for partial denture respectively. Therefore, the results clearly indicated that both types of denture services need to be included for the national oral health care program. 3. As far as indemnity for the prosthodontic coverage is concerned, the survey results indicated a 693,000 won for resin-based full denture and 708,000 won for non-precious metal cast. Dentists are more favor of a monetary (77.3%) than material (20.4%) reimbursement system. 4. When the actuarial cost for the prosthetic appliance only with the time of services rendered, the materials used and the fee for dental technician were calculated without the consideration of difficulty of the prosthetic services, the cost for resin-based full dentures and non-precious metal cast partial dentures were a 560,484 won and 594,160 won respectively. 5. When the actuarial cost for the prosthetic appliance were calculated with the consideration of difficulty of the services which were based on relative service index of 6,567 won per hour, the basic expenses of service rendered, the current insurance payment schedule and the personnel expense for services by a hygienist, the cost for one resin-based full denture and one non-precious metal cast partial denture were a 589,714 won and 610,296 won respectively.