Solar urticaria in Korean patients

( Sung Min Kim ),( Young Ah Cho ),( Ji Su Lee ),( Ji Youn Hong ),( Jin Hee Kim ),( Joo Ran Hong ),( Hye In Cheon ),( Yang Won Lee ),( Yong Beom Choe ),( Kyu Joong Ahn ) 대한피부과학회 2020 대한피부과학회 학술발표대회집 Vol.72 No.1

Background: Solar urticaria (SU) is an uncommon type of photodermatoses characterized by erythematous wheal with pruritus after sunlight exposure, which shows a female predominance. Only a few studies to analyze the clinical features of SU were reported in Asia. Objectives: We aimed to analyze the clinical and photobiological characteristics of SU in Korea. Methods: We retrospectively investigated the medical records of patients with SU who visited the department of dermatology, Konkuk university medical center from January 2005 to January 2020. Results: Of a total of 44 patients, 36 (81.8%) were male and 8 (18.2%) were female. The mean age at onset was 17.6 years (range, 5-47) and the mean threshold time was 19.7 minutes. Among 32 patients who underwent phototesting, the action spectrum most commonly implicated was ultraviolet (UV) A only in 12 (37.5%), and then visible light (415nm) only was responsible for SU in 8 (25.0%). Three patients (9.4%) were induced by both UVA and visible light (415nm). Even 4 patients (12.5%) were triggered by only natural sunlight. Serum immunoglobulin E levels were measured in 33 patients, and 17 (51.5%) showed values higher than normal. The treatment most widely used were oral antihistamine (43.2%), followed by phototherapy (13.6%). Conclusion: SU is a rare photodermatosis in Korea, which shows a male preponderance. In this study, UVA and visible light (415nm) were predominant action spectrum of SU.

전해 인프로세스 드레싱을 이용한 Optical glass계의 경면연삭에 관한 연구

조주현,원종호,박원규,이진오,김민수,김성수 한국공작기계학회 2003 한국공작기계학회 춘계학술대회논문집 Vol.2003 No.-

Electrolytic In-process Dressing (ELID) technique for metal bonded diamond grinding wheel has been developed for mirror surface grinding of hard and brittle materials. This study process optical glass in using Electrolytic In-process Dressing. In using to main variable wheel speed(400 rpm ~ 2000 rpm), feed rate(5 μm/min ~ 25 μm/min), depth of cut (3 μm - 15 μm), dressing and spray. we measured surface roughness by Form Talysurf series2. we finded optimum grinding condition to obtain confident surface roughness in representative brittle materials.

폐 젤리충진 통신케이블로부터 고순도 구리회수를 위한 대형화 방안 연구

조성수 ( Sung Su Cho ),이수영 ( Soo Young Lee ),서민혜 ( Min Hye Seo ),엄성현 ( Sung Hyun Uhm ) 한국공업화학회 2014 공업화학 Vol.25 No.2

폐 젤리충진 통신케이블로부터 고순도 구리회수를 위하여 실리콘계 및 톨루엔계 합성 열매유와 폐식용유를 사용하여 적용성을 평가하였다. 실리콘계 오일의 경우 모든 조건에서 분리효율이 낮은 반면, 톨루엔계 오일 및 폐식용유의 경우 처리온도 및 시간을 조절함에 따라 높은 분리효율을 얻을 수 있었다. 폐식용유를 사용하는 50 kg급 밀폐형 대용량 설비를 이용하여 300 ℃에서 60 min 이상 처리할 경우 99.2% 이상의 고순도 구리와이어를 100% 회수할 수 있었다. We examined and compared the feasibility of vegetable oils with synthetic thermal conductive oils to recover highly purified copper metal from waste jelly-filled communication cables. While polydimethylsiloxane shows relatively poor separation effi-ciency under entire operating conditions, dibenzyltoluene and waste vegetable oil show the high separation efficiency if the appropriate operating temperature and time were given. By running 50 kg-class equipment with waste vegetable oils, we ob-tained 100% copper metal recovery with 99.2% purity at 300 ℃ for 60 min.

Factors Influencing the Acrylamide Content of Fried Potato Products

Jin, Yong-Ik,Park, Kyeong-Hun,Chang, Dong-Chil,Cho, Ji-Hong,Cho, Kwang-Su,Im, Ju-Sung,Hong, Su-Young,Kim, Su-Jeong,Nam, Jung-Hwan,Sohn, Hwang-Bae,Yu, Hong-Seob,Chung, Ill-Min The Korean Society of Environmental Agriculture 2016 한국환경농학회지 Vol.35 No.4

BACKGROUND: Acrylamide (CAS No. 79-06-1) is known to be a carcinogenic compound, and is classified as a Group 2A compound by the International Agency for Research on Cancer (IARC, 1994). Acrylamide can be generated during the browning process via the non-enzymatic Maillard reaction of carbohydrates such as reducing sugars and of amino acids such as asparagine, both of which occur at a temperature above $120^{\circ}C$. Potato tubers contain reducing sugars, and thus, this will affect the safety of processed potato products such as potato chips and French fries. In order to reduce the level of acrylamide in potato processed products, it is therefore necessary to understand factors that affect the reducing sugar content of potatoes, such as environmental factors and potato storage conditions, as well as understanding factors affecting acrylamide formation during potato processing itself. METHODS AND RESULTS: Potatoes were cultivated in eight regions of Korea; For each of these different environments, soil physico-chemical characteristics such as pH, electrical conductivity, total nitrogen, available phosphate, and exchangeable cation content were measured and correlations with potato reducing sugar content and potato chip acrylamide levels were examined. The reducing sugar content in potato during storage for three months was determined and acrylamide level in potato chip was analyzed after processing. The storage temperature levels were $4^{\circ}C$, $8^{\circ}C$, or $10^{\circ}C$, respectively. The acrylamide content of chips prepared from potatoes stored at $10^{\circ}C$ or $20^{\circ}C$ for one month was analyzed and the different frying times were 2, 3, 5, and 7 min. CONCLUSION: This study showed that monitoring and controlling the phosphate content within a potato field should be sufficient to avoid producing brown or black potato chips. For potatoes stored at low temperatures, a reconditioning period ($20^{\circ}C$ for 20 days) is required in order to reduce the levels of reducing sugars in the potato and subsequently reduce the acrylamide and improve chip coloration and appearance.

도로 PSC 표준거더의 최적설계에 관한 연구

조선규,이종민,김수현 서울産業大學校 2005 논문집 Vol.54 No.2

The prestressed concrete girder bridges have been used widely at the domestic national road and highway because it is great in the functional and economical efficiency. It has also the advantage of convenience of design and construction due to using standard sections. However it could be easily verified that previous standard section of PSC girder is excessively designed, which has much more redundancy than is necessary against design loads. Therefore it would greatly influence on economic efficiency for domestic demands, if a section of PSC girder became more economical with satisfying all design criteria. Thus the optimum design for the section of PSC girder using an optimum design method has been performed to examine more effective and economic section than previous standard one.

상악동에 발생한 국균증의 치험2례

조재오,김영균,여환호,김수민,김수관 大韓顎顔面成形再建外科學會 1996 Maxillofacial Plastic Reconstructive Surgery Vol.18 No.4

Aspergillosis of the maxillary sinus was rare disease, but it was increasing tendency with overuse antibiotics, streoid hormones, and anticanncerous agents. The clinical features and X-ray findings are similar to chronic suppurative paranasal sinusitis. Aspergillosis of the maxillary siuses may occur as a chronic diseae in an otherwise healthy person. This infection is usually confined to a single paranasal sinus, the maxillary antrum, though it can involve the orbit and may initiate with findings of proptosis and decreased vision. The disease is characterized by a wide range of initial symptoms, and should be considered as a possible diagnosis in sinusitis refractory to antibiotics and antral lavage. The choice of treatment of this disease is radical surgery and adjunctive systemic antifungal therapy. We experienced a case of right maxillary sinus aspergillosis in a 34 years old male who has dull pain on Rt. zygoma area, and a case of left maxillary sinus aspergillosis in a 30 years old male who had been suffered from nasal stiffness and frontal headache for 3-4 years. We reported two cases with review of literature.

상아질 접착제의 용매 증발이 접착 효율에 미치는 영향

조민우,김지연,김덕수,최경규 大韓齒科保存學會 2010 Restorative Dentistry & Endodontics Vol.35 No.5

연구목적: 본 연구는 상아질 접착제의 잔류 용매가 접착 효율에 미치는 영향을 평가하고자 하였다. 연구 재료 및 방법: 본 연구에서는 5세대 2단계 산부식형 접착제와 7세대 단일과정 자가부식형 접착제를 사용하였다. 상아질 접착제의 증발률과 전환률, 적용 후 용매의 공기건조 방법에 따른 미세인장결합강도를 측정하였으며 접착 계면을 FE-SEM을 이용하여 관찰하였다. 결과: 1. 시간에 따라 접착제의 증발률은 증가하나 접착제의 종류에 따라 증가 양상이 서로 달랐다. 2. 대부분 전환률은 증발률에 비례하는 경향을 나타내었다. 3. 공기건조 방법에 따라 결합강도는 대부분 under군, control군, over군 순으로 증가하는 양상을 나타내었다. 4. FE-SEM에서 아세톤을 용매로 사용하는 접착제는 공기건조 방법에 따라 droplet이나 gap이 관찰되었다. 결론: 상아질 접착제의 잔류 용매는 접착 효율에 부정적인 영향을 미치기 때문에, 상아질 접착제의 선택과 사용 시 용매의 종류와 특징에 대한 적절한 이해가 필요할 것이다. Objectives: The purpose of this study is to evaluate bonding efficacy by means of measuring the effect of remained solvent on Degree of conversion(DC) and μTBS and FE-SEM examination. Materials and Methods: Two 2-step total etching adhesives and two single-step self etching adhesives were used in this study. First, volume weight loss of 4 dentin adhesives were measured using weighting machine in process of time in normal conditions and calculate degree of evaporation (DE). Reaction/reference intensity ratio were measured using micro-Raman spectroscopy and calculate DC according to DE. Then 2 experimental groups were prepared according to air-drying methods (under, over) and control group was prepared to manufacturer's instruction. Total 12 groups were evaluated by means of micro tensile bond strength and FE-SEM examination. Results: Degree of evaporation (DE) was increased as time elapsed but different features were observed according to the kind of solvents. Acetone based adhesive showed higher DE than ethanol and butanol based adhesive. Degree of conversion (DC) was increased according to DE except for S³ bond. In μTBS evaluation, bond strength was increased by additional air-drying. Large gaps and droplets were observed in acetone based adhesives by FE-SEM pictures. Conclusions: Additional air-drying is recommended for single-step self etching adhesive but careful consideration is required for 2-step total etching adhesive because of oxygen inhibition layer. Evaporation method is carefully chose and applied according to the solvent type.

국소성 피질이형성증의 외과적 치료

조관국,김형일,이민철,김근수,김연희,정창오,Neto, Pedro R. 대한신경외과학회 1996 Journal of Korean neurosurgical society Vol.25 No.12

Corticai Dysplasia(CD) is increasingly recognized as a cause of intractable epilepsy since it can be easily diagnosed with high resolution magnetic resonance imaging(MRI). We analyzed 24 consecutive cases with cortical dysplasia who underwent resective surgery at our institute between September. 1992 and December. 1995. MRI was demonstrated to be a decisive tool to identify CD in 16 cases(66.7%). However, the remaining 8 cases(93.9%) were confirmed to have CD based on histological examination. Location of the lesion included temporal(n=9), central(n=5), multilobar(n=5), and frontal(n=5). Intracranial EEG recording was performed to delineate the epileptogenic zons in 16 cases : subdural grid(10 cases) and depth electrode(6 cases). Resection was performed in temporal(n=9), frontal(n=7), central(n=5). parietal(n=1), and muitilobar(n=1). Complete resection was possible in 15(62.5%) and partial resection in 9(37.5%). Histological examination revealed dyslamination of cortical layers only(n=9), additional dysplastic neurons(n=7), and additional balloon cells(n=8). Surgical outcome was graded as seizure free(n=14 : 58.3%), rare seizures(n=3 : 12.5%). <50% reduction of seizure frequency(n=2 : 8%), and no change(n=5 : 20.8%) after mean follow-up of 12.7 months. The most influencing factor on the surgical outcome was the degree of completeness of resection(p<0.05). However. detectability of CD on MRI, severity of histological findings, age of seizure onset, and duration of seizure were not significantly related with the surgical outcome High suspicion is required to detect the CD among the patients with intractable epilepsy and surgical strategies should be well-planned to improve the surgical outcome in the patients with CD.

플라이애시를 다량 사용한 콘크리트의 수화발열 특성과 압축강도 특성에 관한 실험적 연구

조규현,박무영,백민수,김우재,임남기,정상진 대한건축학회 2003 대한건축학회 학술발표대회 논문집 - 계획계/구조계 Vol.23 No.2

This study is for the great quantity use of fly-ash. For the producing of high volume concrete from the use of fly-ash, the method of replacement between bonding agents and fine aggregate by fly-ash at the slt was used that the adiabatic temperature rise of concrete about the mass member which bad been produced by the method that was mentioned before, and the hydration heat of the core test pieces in concrete was measured. Also the core test pieces which were replaced with fly-ash was studied by the compressive strength's comparison between standard care test pieces and core test pieces. In the case of mass test pieces, hydration heat and the time to reach the highest temperature were decreased by an increase in replaced fly-ash's amounts of concrete. In addition, among the test pieces having the same amounts of concrete, the test pieces having more replaced amounts of fly-ash's fine aggregate showed higher hydration heat and the increased time to reach the highest temperature. Compressive strength was also increased by hydration heat's decrease according to fly-ash replacement. Replacement of fly-ash was more effective in high temperature environment.

강원도지역에서 발생한 발진열과 쯔쯔가무시병

민창홍,장우현,강재승,조수익,최문기,조민기,윤창순,김윤원 대한감염학회 1988 감염 Vol.20 No.2

In Korea, there has been an increasing concern on rickettsiosis as one of most prevailing acute febrile illness, since murine typhus and scrub typhus had not been reported for 2 decades until 1986 and thereafter a few studies were reported on these diseases. A microimmunofluorescence test was used to study antibodies to R. typhi and R. tsutsugamushi in urban and rural inhabitants students, and patiants suspected of leptospirosis or rickettsiosis from 1986 to 1987 in Kangwon-do Korea. 43% of inhabitatnts and 17% of students reacted to R. typhi. Only one inhabitant among inhabitants and students reacted to R. tsutsugamushi. Among 169 patients, 43(25%) reacted to R. typhi, 38(22%) to R. tsutsugamushi and 25(15%) to Leptospira interrogans. Sexual rate(male; female) in murine typhus was 1.7:1, that in scrub typhus was 1:2.2 and that in leptospirosis was 1.5;1. The age ditribution of patients with murine typhus was generally even over 20 years old. But 71% of patients with scrub typhus were over 40 years old. Scrub typhus was most prevailing in female over 40 years old. Murine typhus was relatively more prevailing in Choonchun city than rural area as compared with scrub typhus and leptospirosis. Most of scrub typhus occurred in rural area. Most of each disease occurred between September and November (murine typhus; 93%, scrub typhus; 95%, leptospirosis; 84%) with a peak in October. Scrub typhus considerably occurred not only October(58%) but also November(28%). All patients with scrub typhus were immediately diagnosed by antibody when they visited hospital. 53% of patients with murine typhus were diagnosed when they visited hospital within 7 days after onset of illness, and others were done by second sera obtained 8 days after. The patients in whom IgM was seronegative but antibodies of other class were seropsitive by 20 days after onset of illness, were 14% in murine typhus and 26% in scrub typhus. At least those patients were considered to be infected second. Murine typhus and scrub typhus were suggested to be endemic diseases in Kangwon-do as antibodies of inhabitants and characteristics of patients' sera were considered. By serologic finding of patients with scrub typhus in Kangwon-do, Gilliam was 59'% of etiologic strain of scrub typhus, Karp was 41q% and Kato was none. Most scrub typhus occurred in person to be related to agriculture, but murine typhus was not related to job and occurred more in small city than rural area. Rash was scarcely detected in murine typhus and scrub typhus, and eschar was in 50% of scrub typhus only. Serum transaminase elevated in many patients with scrub typhus and murine typhus. Leukocytosis and abnormal finding in chest X-ray were showed in some patients with scrub typhus but were scarcely in murine typhus.