Embed Size (px)
Citation preview
International Institute of Reliability Assessment
ISO/IEC 17025 Quality Management System
Korea Laboratory Accreditation Scheme (KOLAS : Testing No. KT651)
Test Demonstration Center for CSZ Chambers
2
Company Overview
Business and Service
Laboratory and Equipment
Contents
3
Company Overview
Accelerated-life test/Testing and Certification Assessment ServicesTest Design
CAE Simulation
Assessment
KOLAS Certification
R&D Support
도전하라
극복하라 즐겨라
Challenge
Overcome Enjoy
Value Creation of Reliability
Company
Name of
Company
The number of
Employees
CEO
Business Model
IIRAFoundation : April 26th 2013
Total 9 personExecutives : 2 person
Quality Officer : 1 person
Technical Officer : 1 person
Test Engineer : 4 person
Finance / Administration: 1 person
Hyun-Suk, ChungFrontis CEO
IIRA CEO
KORAS (Korean Reliability Society) Vice-PresidentAmerican society for quality Reliability Engineer
Accelerated Assessment Test/ Life
Assessment Specialized InstituteTest Design
Certification / Assessment
R&D Support
General Information
• Support Reliable Authentication
in the United States
•Exchange International Reliability
and technical information
•Support Reliable Training and
Consulting
• Building Industry Cooperation
Infra-structure and Supporting
Companies
•Building Equipment and Infra-
structure
•Make Major for Reliability
Engineering
• IIRA Promotion and Sales
activities
•Building Support System
• IIRA technical assistance
and equipment management
C S Z
Test Demonstration Center for CSZ Chambers
Organization
Management
SupportReliability GroupSystem GroupTest Analysis
CEO
Executive Director
ICT Group
Finance /
Administration
Business Support
Certification /
Assessment
Qualitative
Accelerated Tests
Real Time Mornitoring
Building System /
Management
Equipments Maintenance Quantitative Accelerated
test Design Support
Headquartered existing
organizational support
Position Name Job Specification Tel / E-Mail
CEO Hyun-Suk, Chung CEO +82 31-695-8369 / [email protected]
Head of Center Chang-Kyu, Park Head of Center +82 70-4814-0930 / [email protected]
Quality Officer Hyuck-Ki, Lee Reliability/environmental testing and certification +82 70-4814-0929 / [email protected]
Technician Officer Young-Kyun, Jun Reliability/environmental testing and certification +82 70-4814-0931 / [email protected]
Engineer Sun-Woo, Lee Reliability/environmental testing and certification +82 70-4814-0928 / [email protected]
Engineer Eun-Jung, Cho Reliability/environmental testing and certification +82 70-4814-0927 / [email protected]
Finance Kyung-Hwa. Lim Finance / Administration +82 41-428-9490 / [email protected]
Operating Officer In-Ho, Choi Test Facilities and Operation Executive +82 31-695-6988 / [email protected]
Engineer Han-Bin, Seo Test Facilities and Maintenance +82 31-695-6988 / [email protected]
Engineer Hyun-Woo, Kang Test Facilities and Maintenance +82 31-695-6988 / [email protected]
Engineer Jae-Min, Ha Test Facilities and Building Support +82 31-695-6988 / [email protected]
Business Manager Hye-Ran, Seok Test Facilities and Building Support +82 31-695-6988 / [email protected]
Operating Organization
Hyun-Gak, Han Nano Chemical Engineering Prof. +82 41-530-1362 / [email protected]
Hun-Jin, Park Nano Chemical Engineering Assistant Prof. +82 41-530-4707 / [email protected]
Tae-Ho, Son Information and Communication Technology Prof. +82 41-530-1345 / [email protected]
Kwang-Su, Kim Display New Material Engineering Prof. +82 41-530-1375 / [email protected]
Sang-Wook, Lim Technical Engineering Prof. +82 41-530-1356 / [email protected]
Hwa-Min, Lee Computer Software Engineering Assistant Prof. +82 41-530-4761 / [email protected]
Tae-Hyun, Kim Chemistry Assistant Prof. +82 41-530-4722 / [email protected]
Status of Certification
KOLAS qualified standard
Qualified 7 fields : Electrical Test, Environmental and
Reliability Area Standard
• KS R 9213 : 2007
• KS C IEC 60068-2-1 : 2010
• KS C 0221 : 1999
• KS C 0225 : 2001
• KS C 0228 : 2001
• KS C IEC 60068-2-78 : 2002
• MIL-STD-810G : 31 October 2008
Becoming a global testing organization!Issued International Qualified Test Certificate through
approving Korea Laboratory Accreditation
Scheme(KOLAS): qualified office
ISO/IEC 17025 Quality Management System
Guaranteed quality through strict, systematic
Procedures based on a global standard: ‘ISO/IEC 17025
January 16th 2015
Got a certificate by
KOLAS
Status of Certification (KOLAS Certificate)
11
Business and Service
Business Scope
Qualitative Accelerated Tests
• HALT
• HASS/HASA
Quantitative Accelerated Tests
• Reliability Prediction Analysis
• Reliability Conformity Assessment
Certification Assessment
• Vibration / Shock
• T-Shock / Temp and hum
• Power Temperature Cycle
• Corrosion
• Dust / Water Spray
Specialized Institute of Accelerated Life Test and Life Prediction based on IEC62506• As a specialized Institute of Accelerated Life Test and Life Prediction, we can test HW and product’s
life prediction and design product warranties
• Provide One-Stop Reliability Assessment Service from design to production
Standard Establishment
• Build Process and Accelerated testing Standard
Establishment of building design to guarantee trouble-free
quality/ reliability in the life of the field.
Life Prediction
• Guarantee usage life prediction and lifetime
warranty by product property and field condition in
the field stage
Reliability
Prediction
and WCA
Test
Design
Life
Prediction
Standard
Establishment
Reliability Prediction and WCA (Worst Case
Analysis)• Analysis derating and reliability prediction based on
BOM
• Analysis failure rate by stress range
Test Design
• Design the proper way to test for robust design before making
a product having product property
Service Scope : Quantitative Accelerated Tests
What is HALT?Highly Accelerated Limit Test
Given stressed environment, test for detecting a factor which is causing the failure of the
product or the way to test
HALT
What is HASS?Highly Accelerated Stress Screening
Screening techniques for detecting fault In poor process before shipping or Control Errors
HASS
What is HASA?Highly Accelerated Stress Audit
Monitoring Tool for detecting products’ potential defects(weakened) if target product
of products on the production phase occurred in manufacturing process or not
HASA
Service Scope : Quantitative Accelerated Tests
HALT/HASS
Temp & Hum / T-Shock
Certification/Assessment Vibration
Salt Spray / Dust / Water• Components, modules, early fault detection
system and reliability by building overall
reliability environment test / building
environment test assessment system
• Building test assessment system for a standard
test in Electric / Electronic, military/defense,
automotive/rail, etc.
Service Scope : Certification/Assessment
16
Laboratory and Equipment
LAB 04
Temp & Hum / Power Temperature Cycle
▪ high or low temp test
▪ Temp & Hum test
▪ Temp & Hum cycle test
▪ Condensation test
HALT/T-shock/large constant temperature and humidity chamber
Complex Vibration Tester/Salt Spray
▪ HALT
▪ T-Shock test
▪ Constant Temp & Hum test
▪ Condensation test
▪ Sine wave/Random Vibration
▪ Shock test
▪ Complex Vibration test
▪ Composite Corrosion test
Dust tester/spray tester/thermal shock machine/vibration testing machine
▪ Dust/sand
▪ Water Spray (IPX1,2,3,4, IPX9)
▪ Shock test
▪ Vibration test
▪ T-shock test
Laboratory Status : Test Lab. #1 to #4
LAB 03
LAB 02
LAB 01
Test Laboratory
Real-time Integration
Monitoring
• Workspace Dimensions :
147cm X 147cm X 137cm
• Outside Dimensions :
218cm X 180cm X 260cm
• Temperature Range :
-100℃ ~ +200℃• Ramp Rate : 80℃/min
• Vibration Levels : 3 ~ 60 GRMS
HALT(TC-4.0)
HALT(TC-2.5)
• Workspace Dimensions :
86cm X 86cm X 86cm
• Outside Dimensions :
165cm X 122cm X 213cm
• Temperature Range :
-100℃ ~ +200℃• Ramp Rate : 90℃/min
• Vibration Levels : 3 ~ 90 GRMS
ContentsR&D Support system for securing the margine of
the development process, In addition, progress a
standard HALT test: GMW8287, ES90000-05, etc.
Items for Test
• Cold
; Detecting abnormality and a specialized change
about an each level of cold stress
• Hot
; Detecting abnormality and a specialized change
about an each level of hot stress
• Rapidly Thermal Transition Test
; Detecting abnormality and a specialized change
about rapidly thermal transition
• Random Vibration
; Detecting abnormality and a specialized change
through a random vibration
• Combined Stress
; Detecting abnormality and a specialized change
through approving a complex stress of random
vibration and rapidly thermal transition
Equipment (HALT)
• Workspace Dimensions :
213cm X 274cm X 244cm
• Temperature Range :
-68℃ ~ +160℃• Humidity Range : 10 ~ 95%
• Ramp Rate : 5℃/min
Walk-In Chamber(WWTH504)
Items for Test
• High/Low Temperature Test
; Test to assess the resistance of storage and
functioning at High/Low temperature
• High Temperature and High humidity Test
; Test to assess the resistance of the functioning
when used or stored at a high relative humidity
conditions
• Warm/Humidity cycle test
; Test to assess the resistance when used or stored
with a condition which is the dew on the surface of
the product through the temperature change in
repeat and high humidity conditions
Equipment (Walk-In Chamber)
• Temperature Range :
-70℃ ~ 190℃• Humidity Range : 5% to 98%
RH
• Ramp Rate : 5℃/min
Temperature/Humidity(ZPH-32-6-6-SC/WC)
Temperature/Humidity(ZPH-32-10-10-SC/WC)
• Workspace Dimensions :
122cm X 122cm X 122cm
• Temperature Range :
-70℃ ~ 190℃• Humidity Range : 10% to 98% RH
• Ramp Rate : 10.4℃/min
Temperature/Humidity(ZPH-64-15-15-SC/WC )`
Temperature/Humidity(ZPH-32-20-20-SC/WC )
• Temperature Range :
-70℃ ~ 190℃• Humidity Range : 10% to 98% RH
• Ramp Rate :
21℃/min (-40℃ ~ 85℃)
• Temperature Range :
-70℃ ~ 190℃• Humidity Range : 10% to 98%
RH
• Ramp Rate :
8.3℃/min (-40℃ ~ 85℃)
Items for Test
• High/Low temperature Test
; Test to assess the resistance of storage and
functioning at a high or low temperature
• High temperature and high humidity Test
; Test to assess the resistance functioning when
used or stored at a high relative humidity
• Warn/humidity Cycle Test
; Test to assess the resistance when used or
stored with a condition which is the dew on the
surface of the product through the temperature
change in repeat and high humidity conditions
• Condensation Test
; Test to assess the resistance of functioning
when condensation occurred by temperature
change
Equipment (Temp & Hum chamber)
• Workspace Dimensions :
50cm X 42cm X 50cm
• Temperature Range :
- Hot zone (+57~ 210) ℃- Cold zone : (-70 ~ +190) ℃• Type : 2 Zone, Elevator
Thermal Shock
(VTS-3)
Item for Test
•Thermal Shock
; Test for Assessing the resistance by repeating
Rapidly Transition of High temperature and Low
temperature
• Workspace Dimensions :
770×650×610mm (W×D×H)
• Temperature Range :
- Hot zone (+50 ~ 220) ℃-Cold zone : (-80 ~ +70) ℃• Type : 2 Zone, Elevator
Thermal Shock
(TS-300)
Equipment (Thermal Shock Test)
• Sine & Random Force kgf : 5000
• Shock Force(6ms) kgf : 10000
• Acceleration(Sine) m/s2 (g) : 980
• Horizontal Direction Vibration
Table
Size : 1000mm X 1000mm
• Useful Freq. Range : 0 ~ 2500Hz
Vibration
(M5044A-PA255-LST1000M)
Agree Chamber
(AVHS-32-15-15-SC/WC)
• Workspace Dimension :
1016mm x 1016mm x 914mm
• Maximum Table Size :
914mm X 914mm(W x D)
• Temperature Range :
-70°C ~ 190°C
• Cooling Rate :
11°C/Min(125°C ~ -40°C)
• Humidity Range : 10% ~ 98%RH
Items for Test
• Sine Wave Vibration Test
; Test for evaluating the resistance of the case which
is exposed to a vibration having a periodic nature :
transport or use
• Broadband Random Vibration Test
; Test for evaluating the resistance of the exposed
case which is exposed to a non-uniformly random,
non-periodic vibration
• Shock Test
; Test for evaluating whether it has the reasonable
resistance having a low frequency and No
repeatability during transporting and using
Equipment (Complex Vibration Tester)
• Sine & Random Force : 1000kgf
• Shock Force (6ms) : 2000kgf
• Acceleration(Sine) : 981 m/s2 (g)
• Displacement : 51mm
• Velocity Sine Peak : 1.8m/s
• Max. static payload : 140 kg
• Armature diameter : 240 mm
Vibration(MPA403/M124M)
Items for Test
• Sine Wave Vibration Test
; Test for evaluating the resistance of the case which is
exposed to a vibration having a periodic nature :
transport or use
• Broadband Random Vibration Test
; Test for evaluating the resistance of the exposed case
which is exposed to a non-uniformly random, non-
periodic vibration
• Shock Test
; Test for evaluating whether it has the reasonable
resistance having a low frequency and No repeatability
during transporting and using
Equipment (Vibration Tester)
• Reinforced Plastic Chamber with 60 gal.(227 liter)
• Automatic Cycling between Salt Fog, High Humidity,
Dry-Off, Dwell and optional cycles
• Exposure Zone Temperature up to 71℃/ 160℉• Humidity Range : 20%RH ~ 100%RH
• Wetting mode : +50°C• Drying mode : +50°C
Salt Spray
(CCX300)
Item for Test
• Salt Spray Test
It evaluates various corrosion mechanisms like
general corrosion, galvanic, crevice corrosion
by providing complex cycle condition(salt water,
a variety of temperature and humidity, the
environment) to accelerate corrosion of metal
Equipment (Salt Spray)
• Test space : 800×1000×800 mm (H×W×D)
• Temperature range : (5 ~ 40)℃• Specimen weight : max. 100kg
• Air velocity : 1.5/ 3/5 m/s
• Dust reservoir : 20 kg contents
• Compressed air connection : max. 6bar
Dust
(ST-1000U)
Items for Test• Dust Tester
Industrial dust and sand test is carried out to evaluate
the following three points :
1) Confidentiality : Assess whether fine dust is entering
into the product or not
2) Influence by settling dust: Assess whether the
performance of the product is affected by the build-up of
dust in an enclosed space or not
3) Influence by windblown dust and sand: Assess
whether it was installed at outdoor or windblown sand
and dust entered into the inside of product of using a car
or not
Equipment (Dust Tester)
• IPX 1,2,3,4 (IEC 60529)- Size for dropping water:
500×500mm- Flow Rate : 1mm/min- Flow Control :
Water pump R.P.M Control- Testing Angle : (0 ~ 180)°
• R1,R2,S1,S2 (JIS D0203, KS R 0015)
Spray & Splash Water(IPX 1,2,3,4 R1,R2/S1,S2)
Spray & Splash Water(IPX 9K)
• Water Spray Flow: Max. 15L/min• Water temperature : (room temperature ~ 90)℃ • Water Pressure ： max. 100bar• FAN JET Nozzle part- Nozzle : sus 316 injection nozzle- Spraying angle : 0°, 30°, 60°, 90°
Items for Test
• Spray TesterWaterproof and durability evaluation by flooding
; IPX1 : Dripping water drops to enclosure- vertically falling water drops
; IPX2 : Water drops with Tilted 15°- water drop with tilted 15° on the both
sides of the vertical enclosure; IPX3 : Water spray
- watering to enclosure by all direction of Tiltled 60°; IPX4 : High-pressure water spray
- watering to enclosure by all direction with high-pressure; IPX9 : High-pressure / Spray- Watering to enclosure by all direction
Equipment (Water Spray)
SEM
(SNE-3000M)
X-Ray
(TVN-IM9000)Cross Section
Scope
(BX51TRF)ContentsCause Analysis System to derive an
improved issue of fault after fault detection
Items for Test
• X-Ray
• Cross Section
• SEM
Equipment (Failure Analysis)
28
Result Status
- By Industry
- By Equipments
Key Trading Top 5 – Share of corporate performance
Automative
Electronics 50%
Home Appliances 26%
Defense 10%
Aviation 5%Other 9%
Share by industry
Delphi Connection System (Automative electronics)
Hyundai-Mobis (Automative electronics)
Continental Automotive System (Automative
electronics)
Humax (Set Top Box)
Coavis (Automative electronics)
Result by Industry
Project
Performance
Output
Project Contents Period Company’s name
• Verification for initial reliability predication, EMI simulation, HALT Standard step up and the product about Japanese Car Black Box 2 years Joutec
• Build HALT test process in HALT standard establishment, HALT testing standard establishment, and reliability standard for getting reliability of
electrical equipment 1 year Ssangyong Motors
• Develop Cooling and Heating localization of Car Sheet by Frontis : Develop test and Module of cooling and heating sheet test 1 year Daewon
• Build accelerated testing standard establishment of design step and internal reliability process to ensure a trouble-free quality and reliability in
life time of field about set-top box1 year Humax
• Verification of life warranty testing design, HALT standard establishment, and goods about wireless relay system 2 years Solid
• Verification for HALT standard establishment and margin before and after comparison about control of household appliances for export and
power module2 years Daewoo Electronics
• Set up HALT Standard, reliability prediction about broadband users’ network equipment core modules 1 year DasanNetworks
• Verification for EMI simulation, HALT standard establishment and margin of products about optical medical devices for international 1 year Huvits
• Life warranty testing design, progress and Life Prediction about using environmental condition of military navigation sensor module 6 months Micro Infinity
• Reliability cause analysis of Marine controller and HW-SW integrated accelerated testing design (SW testing in progress) 4 years HTF/Daewoo Shipbuild
• Published reliability guideline and various national reliability assessment standard establishment
(performed Reliability Innovation Center, Kilt)
- Samsung Electro-Mechanics : Design improvement and process improvement through reliability analysis
- Samsung Electro-Mechanics : material, structure improvement and process improvement through failure analysis of film capacitors
- LG Electronics : build basic reliability of LED packages, modules, and products (Testing equipment, reliability methods, building analysis tool)
- RIC (Reliability Innovation Center) : participated in 52 types of reliability guideline establishment, developed 4 types among 52 types, etc.
2 years
2 years
8 months
5 years
Samsung Electro-
Mechanics
LG Elctronics
Suwon Univ.
• Test Lab Monitoring System and Management 1 year Hyundai/Kia Motors
• Charge of Functional safety Consortium HW TEST
• Hyundai Accelerated Society Members (the first
private company participation)
• Signed MOU with LG Chemical, Audi, BMW, DT&C,
etc.
Result by Projects
Project
Promoting
Scope
Cause
Analysis
• Design and optimized process through cause analysis(SEM/EDS, tensile strength, etc.) and the process cause analysis by design material,
structure, design of a capacitor (DOE utilized)
• Analysis of failure cause by over stress of power IC
• Estimate Tj Value by Gap(△T) of part units heat distribution, heat-sink distribution: FET, semiconductor types
• SMPS Failure cause analysis : structure improvement and process improvement by thermal analysis and measurement
(FMEA/FTA/Prediction)
Reproduction
test
• Migration mechanism analysis of Electronics and test development (with Continental Automotive in discussion)
• Perform design guarantee tests of vulnerability analysis, field reproduction, an each vehicle, and a field of national defense at the
development/design step by applying HALT test
• Reproducing test of part unit : passive components like capacitor, active components like LED packages (AEC standard)
• Reproducing testing of module and system unit : reproduce main failure type through random failure mechanism and margin analysis
(importance of implementing test device)
• Others : based on vibration testing profile of Hyundai Motor, IIRA is on the test
• Progress on projects (2 cases) through testing design and test support if it is necessary at development stage, GNW, etc.
Simulation
• BAS system Acoustic Analysis (FBU) : contribution analysis by design parameters using acoustic contribution analysis and LMS Virtual Lab
Acoustics through unique mode analysis of BAS system using FEM technique
• Probe Card Simulation (EBU) : S-parameter of Probe Card, Impedance Simulation
• USB 3.1 C-type design analysis (EBU) : Performance Improvement of USB 3.1 C-type (Loss Analysis and S-Parameter analysis, design
parameter fit analysis)
• Magnet Coupling analysis (EBU) : Talk analysis by the angle of rotation of the Magnet Coupler
Accelerated
test design
(Standard and
specification
establishment)
• Accelerated Life Test(ALT) : Passive components, active components(Capacitors, IC, LED packages) reliability Certification criteria
• Module and system unit : Test equipment manufacturing(Patent), Development of ALT/Accelerated Degradation Test Method
• LED Package, Module, and building reliability, LG electronics (Test equipment, reliability method, building analysis Tool)
• Accelerated Sequential Test(AST) for ensuring the field at the development/design stage and Accelerated Degradation Test(ADT) Design,
Humax(test time spent 7 days)
• others
- experienced reliability assessment of components and system and ALT/ADT test design ( performed reliability assessment and test design
during 17 years)
- Suggest accelerated testing trend, Sequential Test, System test and HW-SW integrated test through exchanging Hyundai-Movis
- Reliability analysis, assessment, and HW-SW integrated test method of Ship control (in progress)
improvement
• Change design features for temperature reduction through thermal analysis of heatsink (before and after test comparison)
• Design of experiment and optimized design by applying robust design : LG electronics 4 days training
• Comparison analysis between before testing products and after products through SMPS circuit design and process improvement (same cost)
• Change design after analyzing failure mechanism of passive components, active components, polymers, machinery, and module (had various
data about accidental and wear mechanism)
• Change design by applying derating/uprating of components(had various data about derating technical standard of electronic parts)
• Others : Reliability Innovation Center : participated in 52 types of reliability guideline establishment. developed 4 types among 52 types
(ministry of commerce support) etc.
Promoting Area by Projects
Main Client List Reliability Consulting / 수명평가
Consulting / Goverment Task
51 other companies
21 other companies
9 other compani
es
Main Client List
MOU – Functional Safety Consortium (June 29th 2015)
• Title : participated in Functional Safety Committee and Functional Safety
Certification Consortium Business
• Purpose : Build a basic composition of the consortium and test certification,
Functional Safety Council(Provisional name), for promoting continuous
improvement on domestic industries’ reliability and safety
• Participating Institution: KTL, KRRI, KATECH, Frontis, SureSoft
• Role : SIL TEST by H/W sector (Reliability/ Stability Test Assessment)
- Main Participant : Frontis / Testing Institute : IIRA
Brief of MOU
MOU w/ LG Chemical (March 9th,2016)
Secure a quality of BMS, battery, etc. among electric vehicles fields
through promoting research development, equipment utilization,
technical guidance/ transferring, etc. and sharing information and
network interactively and cooperate the business through reliability test
analysis
Brief of MOU
MOU w/ Continental Automotive System (Feburary 29th 2016)
Designated “Automotive electronic testing consignment and analysis
collaboration Institute” by mutual exchanging the both companies’
accumulated know-how and infrastructure, and in addition cooperating in
standardization work such as standardized test methods, standards
organization, etc.
Brief of MOU
MOU w/ DT&C (Feburary 2nd 2016)
Designated “test in progress, analysis partners” through cooperation, plan to
business development such as experts’ participation for operation of test
analysis information systems and development cooperation, searching joint
research and technical collaboration. In addition, for a better qualified test
analysis than the analysis by KOLAS qualified institution, we will cooperation
the analysis by exchange the information about testing business process.
Brief of MOU
HALT Theory and Practice
• subject : High Accelerated-Life Test Theory and Practice
- Based on Qualitative life test : HALT/HASS/HASA
• Place : IIRA 6 floor Seminar Room
• Object : Researcher and Reliability engineer, college
students or graduate students related to
electrical/electronic/automotive area or
•hours : 10:00 ~ 17:00 (1 day)
No. Calendar Term Lecture
4 times1 time by a quarter(Bulletin website)
1 dayInternallecturer
Training Schedule of 2016
< Picture of HALT / HASS Training> <View of a place of training>
Training Program for Reliability Assessment and Equipment Operation
s
Direction to Entrepreneurship Building at SCH Univ.
No.1205. 101 dong, Digital Empire II, 88 Sinwon-ro, Yeongtong-gu Suwon-si, Gyeonggi-province, 443-734, KOREATel 82-31-695-6988 Fax 82-31-695-6989
www.frontis.co.kr
Entrepreneurship Building, 22 Soonchunhyang-ro, Sinchang-
myeon, Asansi, Chungnam, South Korea 31538
