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비중격 천공이 없는 크롬 노출 근로자에서의 후각장해에 관한 연구
최재욱,이성희,최연국,이은일,김해준 대한산업의학회 2000 대한직업환경의학회지 Vol.12 No.2
Objectives : The chrome-induced olfactory alterations is caused by inhalation of chromic acid, a highly corrossive and toxic materials. And nasal septum perforation (NSP) has been suspected with possible causative factor of olfactory alterations. To our knowledge, there has been no report of the detailed findings of the olfactory alterations in chrome exposed subjects without nasal septum perforation (NSP). So we present the results of olfactory function test measured by T&T olfactometer and olfactometer perception test among chromium exposed workers without NSP. Methods : We performed this study in 25 study subjects and 25 control subjects matched with age, alcohol and smoking. All of subjects are man. We performed olfactory function test measured by T&T olfactometer and olfactometer perception test. Results : 1) The age distribution of the subjects involved in this study was from 20 to 54 years old (average 33.3 years old) and the mean duration exposed to chromium was from 64.9 months. 2) The olfactory function was checked by detection and recognition thresholds in five odorants. The detection thresholds of exposed group dealing with chromium were significantly increased in A and B ordorants than nonexposed group. The recognition thresholds of exposed group were significantly increased in D ordorants than nonexposed group. 3) The mean threshold of olfactometer perception test of exposed group were more increased than nonexposed group. But thresholds difference did not show statistical significance. 4) The detection thresholds of A and D ordorants, recognition threshold of C ordorants and thresholds of olfactometer perception test were increased in the relation with duration of chrome exposure. Conclusions : There has been no remarkable alterations in olfactory sense (T&T olfactometer and Olfactometer Perception Test) in subjects without nasal septum perforation (NSP) exposed to chromic acid.
윤보람(Boram Yoon),최연국(Yeon Guk Choi),변문환(Mun Hwan Byoun) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
Brake caliper is a critical component that applies braking force by pressing pistons against the brake disc. While caliper is primarily designed for functionality, external coating and design are also considered for caliper appearance. Caliper cover is an accessory that can be attached to the caliper to enhance its external appearance independent of caliper function. This cover is made of lightweight materials and designed with various colors and lettering. The attachment method and potential interference with other caliper components should be carefully considered to ensure proper assembly and attachment strength for caliper cover. In this paper, we study about caliper cover attachment method using rubber bush which offers advantages compared to other attachment methods. Caliper cover design is developed with consideration for aluminum die-casting productivity and avoiding interference with other caliper components. Assembly, detachment force and vibration durability tests are conducted using four combinations of caliper body and caliper cover samples. Through these test results, we confirmed the feasibility and effectiveness of the rubber bush attachment method for caliper cover.
김상현(Sang Hyun Kim),최연국(Yeun Kuk Choi),박숙아(Suk Ah Park) 대한두경부종양학회 1998 대한두경부 종양학회지 Vol.14 No.2
Metastatic squamous carcinoma of the head and neck may rarely present as a cyst in the cervical region. The true incidence of metastatic cystic neck mass is unknown. It is difficult to differentiate metastatic cystic neck mass from congenital cystic neck mass with physical examination and fine needle aspiration biopsy. So the differential diagnosis is dependent on the age of the patient, and therefore in the patient over the 40 years of age, the possibility of a metastatic neck mass should be considered. We report a metastatic cystic neck mass which had been misdiagnosed as a branchial cleft cyst.